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1

Glossary Term - Alpha Decay  

NLE Websites -- All DOE Office Websites (Extended Search)

Universe Previous Term (10 Most Abundant Elements in the Universe) Glossary Main Index Next Term (Alpha Particle) Alpha Particle Alpha Decay Alpha Decay Diagram Alpha decay is one...

2

Alpha decay favoured isotopes of some superheavy nuclei: Spontaneous fission versus alpha decay  

E-Print Network (OSTI)

Spontaneous fission and alpha decay are the main decay modes for superheavy nuclei. The superheavy nuclei which have small alpha decay half-life compared to spontaneous fission half-life will survive fission and can be detected in the laboratory through alpha decay. We have studied the alpha decay half-life and spontaneous half-life of some superheavy elements in the atomic range Z = 100-130. Spontaneous fission half-lives of superheavy nuclei have been calculated using the phenomenological formula and the alpha decay half-lives using Viola-Seaborg-Sobiczewski formula (Sobiczewski et al. 1989), semi empirical relation of Brown (1992) and formula based on generalized liquid drop model proposed by Dasgupta-Schubert and Reyes (2007). The results are reported here.

O. V. Kiren; S. B. Gudennavar; S. G. Bubbly

2013-01-09T23:59:59.000Z

3

Determination of alpha_s from tau decays  

E-Print Network (OSTI)

Hadronic tau decays offer the possibility of determining the strong coupling alpha_s at relatively low energy. Precisely for this reason, however, good control over the perturbative QCD corrections, the non-perturbative condensate contributions in the framework of the operator product expansion (OPE), as well as the corrections going beyond the OPE, the duality violations (DVs), is required. On the perturbative QCD side, the contour-improved versus fixed-order resummation of the series is still an issue, and will be discussed. Regarding the analysis, self-consistent fits to the data including all theory parameters have to be performed, and this is also explained in some detail. The fit quantities are moment integrals of the tau spectral function data in a certain energy window and care should be taken to have acceptable perturbative behaviour of those moments as well as control over higher-dimensional operator corrections in the OPE.

Jamin, Matthias

2013-01-01T23:59:59.000Z

4

Alpha-nucleus potential for alpha-decay and sub-barrier fusion  

E-Print Network (OSTI)

The set of parameters for alpha-nucleus potential is derived by using the data for both the alpha-decay half-lives and the fusion cross-sections around the barrier for reactions alpha+40Ca, alpha+59Co, alpha+208Pb. The alpha-decay half-lives are obtained in the framework of a cluster model using the WKB approximation. The evaluated alpha-decay half-lives and the fusion cross-sections agreed well with the data. Fusion reactions between alpha-particle and heavy nuclei can be used for both the formation of very heavy nuclei and spectroscopic studies of the formed compound nuclei.

V. Yu. Denisov; H. Ikezoe

2005-10-27T23:59:59.000Z

5

Competition between alpha-decay and beta-decay for Heavy and Superheavy Nuclei  

E-Print Network (OSTI)

In this work, the $\\beta$-stable region for Z $\\geq$ 90 is proposed. The calculated $\\beta$-stable nuclei in the $\\beta$-stable region are in good agreement with the ones obtained by M\\"{o}ller \\emph{et al}.. The half-lives of the nuclei close to the $\\beta$-stable region are calculated and the competition between $\\alpha$-decay and $\\beta$-decay is systematically investigated. The calculated half-lives and the suggested decay modes are well in line with the experimental results. The predictions for half-lives and decay modes of the nuclei with Z = 107$-$110 are presented.

Zongqiang Sheng; Liangping Shu; Ying Meng; Jigang Hu; Jianfa Qian

2014-01-16T23:59:59.000Z

6

Estimation of the alpha decay half-lives D. N. Poenaru and M. Ivascu  

E-Print Network (OSTI)

semiempirical relationship is derived on the grounds of the fission theory of alpha decay. It takes }, based on the fission theory of alpha decay [16] have been derived and was briefly presented in refe

Paris-Sud XI, Université de

7

Measurement of the Alpha Asymmetry Parameter for the Omega- to Lambda K- Decay  

E-Print Network (OSTI)

We have measured the alpha parameter of the Omega- to Lambda K- decay using data collected with the HyperCP spectrometer during the 1997 fixed-target run at Fermilab. Analyzing a sample of 0.96 million Omega- to Lambda K^-, Lambda to p pi- decays, we obtain alpha_Omega*alpha_Lambda = [1.33+/-0.33(stat)+/-0.52(syst)] x 10^{-2}. With the accepted value of alpha_Lambda, alpha_Omega is found to be [2.07+/-0.51(stat)+/-0.81(syst)] x 10^{-2}.

HyperCP Collaboration; Y. C. Chen; R. A. Burnstein; A. Chakravorty; A. Chan; W. S. Choong; K. Clark; E. C. Dukes; C. Durandet; J. Felix; G. Gidal; P. Gu; H. R. Gustafson; C. Ho; T. Holmstrom; M. Huang; C. James; C. M. Jenkins; D. M. Kaplan; L. M. Lederman; N. Leros; M. J. Longo; F. Lopez; L. C. Lu; W. Luebke; K. B. Luk; K. S. Nelson; H. K. Park; J. P. Perroud; D. Rajaram; H. A. Rubin; P. K. Teng; J. Volk; C. G. White; S. L. White; P. Zyla

2005-02-25T23:59:59.000Z

8

Systematics of {alpha}-decay half-lives around shell closures  

Science Conference Proceedings (OSTI)

We present a systematic calculation of {alpha}-decay half-lives of even-even heavy and superheavy nuclei in the framework of the preformed {alpha} model. The microscopic {alpha}-daughter nuclear interaction potential is calculated by double-folding the density distributions of both {alpha} and daughter nuclei with a realistic effective Michigan three-Yukawa nucleon-nucleon interaction, and the microscopic Coulomb potential is calculated by folding the charge density distributions of the two interacting nuclei. The half-lives are found to be sensitive to the density dependence of the nucleon-nucleon interaction and the implementation of the Bohr-Sommerfeld quantization condition inherent in the Wentzel-Kramers-Brillouin approach. The {alpha}-decay half-lives obtained agree reasonably well with the available experimental data. Moreover, the study has been extended to the newly observed superheavy nuclei. The interplay of closed-shell effects in {alpha}-decay calculations is investigated. The {alpha}-decay calculations give the closed-shell effects of known spherical magicities, Z=82 and N=126, and further predict enhanced stabilities at N=152,162, and 184 for Z=100,108, and 114, owing to the stability of parent nuclei against {alpha} decays. It is worth noting that the aim of this work is not only to reproduce the experimental data better, but also to extend our understanding of {alpha}-decay half-lives around shell closures.

Ismail, M.; Ellithi, A. Y.; Botros, M. M.; Adel, A. [Physics Department, Faculty of Science, Cairo University (Egypt)

2010-02-15T23:59:59.000Z

9

Quantization in Classical Mechanics and Diffusion Mechanism of Alpha Decay, Proton and Cluster Radioactivity, Spontaneous Fission  

SciTech Connect

Based on the Chetaev generalized theorem the Schroedinger equation as the stability condition of trajectories in classical dynamics in the presence of dissipative forces is derived. In the framework of this approach the alternative model for unified description of alpha decay, spontaneous fission, cluster and proton radioactivity and is developed. We show the possibility of the classical (without tunneling) description of radioactive decay of heavy nuclei, when the so called noise-induced transition or, in other words, the stochastic channel of radioactive decay conditioned by the Kramers diffusion mechanism is generated under certain conditions.Using the ENSDF nuclear data, we have found the parametrized solutions of the Kramers equation of the Langevin type by the Alexandrov dynamic auto-regularization method (REGN-Dubna program). These solutions describe with high-accuracy the dependences of half-life (the decay probability) of heavy radioactive nuclei on total kinetic energy of daughter decay products.Verification of the inverse problem solution in the framework of the universal Kramers description of alpha decay, spontaneous fission, cluster and proton radioactivity, which based on the newest experimental data for alpha-decay of even-even superheavy nuclei (Z = 114, 116, 118), shows good coincidence of the experimental and theoretical dependences of half-life on alpha-decay energy.

Rusov, V. D.; Vlasenko, D. S.; Deliyergiyev, M. A. [Department of Theoretical and Experimental Nuclear Physics, Odessa National Polytechnic University, Odessa (Ukraine); Mavrodiev, S. Cht. [Institute for Nuclear Research and Nuclear Energy, BAS, Sofia (Bulgaria)

2010-01-01T23:59:59.000Z

10

Quantization in Classical Mechanics and Diffusion Mechanism of Alpha Decay, Cluster Radioactivity, Spontaneous Fission  

SciTech Connect

Based on the Chetaev generalized theorem the Schredinger equation as the stability condition of trajectories in classical dynamics in the presence of dissipative forces is derived. In the framework of this approach the alternative model for unified description of alpha decay, spontaneous fission, cluster radioactivity and is developed. We show the possibility of the classical (without tunneling) description of radioactive decay of heavy nuclei, when the so called noise-induced transition or, in other words, the stochastic channel of radioactive decay conditioned by the Kramers diffusion mechanism is generated under certain conditions.Using the ENSDF nuclear data, we have found the parametrized solutions of the Kramers equation of the Langevin type by the Alexandrov dynamic auto-regularization method (REGN-Dubna program). These solutions describe with high-accuracy the dependences of half-life (the decay probability) of heavy radioactive nuclei on total kinetic energy of daughter decay products.Verification of the inverse problem solution in the framework of the universal Kramers description of alpha decay, spontaneous fission, cluster radioactivity, which based on the newest experimental data for alpha-decay of even-even superheavy nuclei (Z = 114, 116, 118), shows good coincidence of the experimental and theoretical dependences of half-life on alpha-decay energy.

Rusov, V. D.; Vlasenko, D. S.; Deliyergiyev, M. A. [Department of Theoretical and Experimental Nuclear Physics, Odessa National Polytechnic University, Odessa (Ukraine); Mavrodiev, S. Cht. [Institute for Nuclear Research and Nuclear Energy, BAS, Sofia (Bulgaria)

2010-05-04T23:59:59.000Z

11

Glossary Term - Alpha Particle  

NLE Websites -- All DOE Office Websites (Extended Search)

Decay Previous Term (Alpha Decay) Glossary Main Index Next Term (Atomic Number) Atomic Number Alpha Particle alphaparticle.gif Produced during alpha decay, an alpha particle is a...

12

Plutonium-238 alpha-decay damage study of the ceramic waste form.  

Science Conference Proceedings (OSTI)

An accelerated alpha-decay damage study of a glass-bonded sodalite ceramic waste form has recently been completed. The purpose of this study was to investigate the physical and chemical durability of the waste form after significant exposure to alpha decay. This accelerated alpha-decay study was performed by doping the ceramic waste form with {sup 238}Pu which has a much greater specific activity than {sup 239}Pu that is normally present in the waste form. The alpha-decay dose at the end of the four year study was approximately 1 x 10{sup 18} alpha-decays/gram of material. An equivalent time period for a similar dose of {sup 239}Pu would require approximately 1100 years. After four years of exposure to {sup 238}Pu alpha decay, the investigation observed little change to the physical or chemical durability of the ceramic waste form (CWF). Specifically, the {sup 238}Pu-loaded CWF maintained it's physical integrity, namely that the density remained constant and no cracking or phase de-bonding was observed. The materials chemical durability and phase stability also did not change significantly over the duration of the study. The only significant measured change was an increase of the unit-cell lattice parameters of the plutonium oxide and sodalite phases of the material and an increase in the release of salt components and plutonium of the waste form during leaching tests, but, as mentioned, these did not lead to any overall loss of waste form durability. The principal findings from this study are: (1) {sup 238}Pu-loaded CWF is similar in microstructure and phase composition to referenced waste form. (2) Pu was observed primarily as oxide comprised of aggregates of nano crystals with aggregates ranging in size from submicron to twenty microns in diameter. (3) Pu phases were primarily found in the intergranular glassy regions. (4) PuO phase shows expected unit cell volume expansion due to alpha decay damage of approximately 0.7%, and the sodalite phase unit cell volume has expanded slightly by 0.3% again, presumably due to alpha-decay damage. (5) No bulk sample swelling was observed. (6) No amorphization of sodalite or actinide bearing phases was observed after four years of alpha-decay damage. (7) No microcracks or phase de-bonding were observed in waste form samples aged for four years. (8) In some areas of the {sup 238}Pu doped ceramic waste form material bubbles and voids were found. Bubbles and voids with similar size and density were also found in ceramic waste form samples without actinide. These bubbles and voids are interpreted as pre-existing defects. However, some contribution to these bubbles and voids from helium gas can not be ruled out. (9) Chemical durability of {sup 238}Pu CWF has not changed significantly after four years of alpha-decay exposure except for an increase in the release of salt components and Pu. Still, the plutonium release from CWF is very low at less than 0.005 g/m{sup 2}.

Frank, S. M.; Barber, T. L.; Cummings, D. G.; DiSanto, T.; Esh, D.W.; Giglio, J. J.; Goff, K. M.; Johnson, S. G.; Kennedy, J. R.; Jue, J-F; Noy,M.; O'Holleran, T. P.; Sinkler, W.

2006-03-27T23:59:59.000Z

13

A new semiempirical formula for the alpha decay half-lives D. N. Poenaru, M. Ivascu and D. Mazilu  

E-Print Network (OSTI)

life-time was derived on the ground of the fission theory of alpha decay. It takes into consideration discovered. On the other hand, new effects can be introduced. Our new equation is based on the fission theory

Paris-Sud XI, Université de

14

Analysis of nuclear materials by energy dispersive x-ray fluorescence and spectral effects of alpha decay  

SciTech Connect

Energy dispersive X-ray fluorescence (EDXRF) spectra collected from alpha emitters are complicated by artifacts inherent to the alpha decay process, particularly when using portable instruments. For example, {sup 239}Pu EDXRF spectra exhibit a prominent uranium L X-ray emission peak series due to sample alpha decay rather than source-induced X-ray fluorescence. A portable EDXRF instrument was used to collect spectra from plutonium, americium, and a Pu-contaminated steel sample. The plutonium sample was also analyzed by wavelength dispersive XRF to demonstrate spectral differences observed when using these very different instruments.

Worley, Christopher G [Los Alamos National Laboratory

2009-01-01T23:59:59.000Z

15

The Schrodinger-Chetaev Equation in Bohmian Quantum Mechanics and Diffusion Mechanism for Alpha Decay, Cluster Radioactivity and Spontaneous Fission  

E-Print Network (OSTI)

In the framework of Bohmian quantum mechanics supplemented with the Chetaev theorem on stable trajectories in dynamics in the presence of dissipative forces we have shown the possibility of the classical (without tunneling) universal description of radioactive decay of heavy nuclei, in which under certain conditions so called noise-induced transition is generated or, in other words, the stochastic channel of alpha decay, cluster radioactivity and spontaneous fission conditioned by the Kramers diffusion mechanism. Based on the ENSDF database we have found the parametrized solutions of the Kramers equation of Langevin type by Alexandrov dynamic auto-regularization method (FORTRAN program REGN-Dubna). These solutions describe with high-accuracy the dependence of the half-life (decay probability) of heavy radioactive nuclei on total kinetic energy of daughter decay products. The verification of inverse problem solution in the framework of the universal Kramers description of the alpha decay, cluster radioactivity and spontaneous fission, which was based on the newest experimental data of alpha-decay of even-even super heavy nuclei (Z=114, 116, 118) have shown the good coincidence of the experimental and theoretical half-life depend upon of alpha-decay energy.

V. D. Rusov; S. Cht. Mavrodiev; M. A. Deliyergiyev

2008-10-16T23:59:59.000Z

16

HEP/123-qed Fine structure of alpha decay in odd nuclei  

E-Print Network (OSTI)

Using an ? decay level scheme, the fine structure in odd nuclei is explained by taking into account the radial and rotational couplings between the unpaired valence nucleon and the core of the decaying system. It is shown that the experimental behavior of the ? decay fine structure phenomenon is governed by the dynamical characteristics of the system.

M. Mirea

2000-01-01T23:59:59.000Z

17

It's Elemental - Isotopes of the Element Meitnerium  

NLE Websites -- All DOE Office Websites (Extended Search)

Available Alpha Decay (suspected) No Data Available 272 No Data Available Spontaneous Fission (suspected) No Data Available Alpha Decay (suspected) No Data Available 273 No Data...

18

It's Elemental - Isotopes of the Element Roentgenium  

NLE Websites -- All DOE Office Websites (Extended Search)

Available Alpha Decay (suspected) No Data Available 276 No Data Available Spontaneous Fission (suspected) No Data Available Alpha Decay (suspected) No Data Available 277 No Data...

19

suspect  

Science Conference Proceedings (OSTI)

... henrietta maria. henrietta. hassle. harriet. gun. grosvenor. graduate university. graduate. go-between. ... international. fraud. art. year. market. sale. new. ...

20

System and method for disrupting suspect objects  

Science Conference Proceedings (OSTI)

A system and method for disrupting at least one component of a suspect object is provided. The system includes a source for passing radiation through the suspect object, a screen for receiving the radiation passing through the suspect object and generating at least one image therefrom, a weapon having a discharge deployable therefrom, and a targeting unit. The targeting unit displays the image(s) of the suspect object and aims the weapon at a disruption point on the displayed image such that the weapon may be positioned to deploy the discharge at the disruption point whereby the suspect object is disabled.

Gladwell, T. Scott; Garretson, Justin R; Hobart, Clinton G; Monda, Mark J

2013-07-09T23:59:59.000Z

Note: This page contains sample records for the topic "alpha decay suspected" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

The Particle Adventure | Particle decays and annihiliations ...  

NLE Websites -- All DOE Office Websites (Extended Search)

mass in a radioactive decay go? Recall that we said that when uranium decays into thorium and an alpha particle, 0.0046 u of mass appears to have been lost. As Einstein said,...

22

Suspect/Counterfeit and Defective Items  

NLE Websites -- All DOE Office Websites (Extended Search)

Items Home SuspectCounterfeit Items Defective Items Safety Advisories Safety Alerts Safety Bulletins SCI Points of Contact SCI Studies References Topical Search SCI-DI...

23

Study of the decay asymmetry parameter and CP violation parameter in the Lambdac+ --> Lambda pi+ decay  

E-Print Network (OSTI)

Using data from the FOCUS (E831) experiment at Fermilab, we present a new measurement of the weak decay-asymmetry parameter alpha(Lambdac) in Lambdac --> Lambda pi decay. Comparing particle with antiparticle decays, we obtain the first measurement of the CP violation parameter : A = [alpha(Lambdac)+alpha(antiLambda_c)]/[alpha(Lambdac)-alpha(antiLambda_c)]. We obtain alpha(Lambdac)=-0.78+-0.16+-0.13 and A = -0.07+-0.19+-0.12 where errors are statistical and systematic.

J. M. Link

2005-09-28T23:59:59.000Z

24

Guidelines for identifying suspect/counterfeit material  

SciTech Connect

These guidelines are intended to assist users of products in identifying: substandard, misrepresented, or fraudulently marked items. The guidelines provide information about such topics as: precautions, inspection and testing, dispositioning identified items, installed inspection and reporting suspect/counterfeit materials. These guidelines apply to users who are developing procurement documents, product acceptance/verification methods, company procedures, work instructions, etc. The intent of these SM guidelines in relation to the Quality Assurance Program Description (QAPD) and implementing company Management Control Procedures is not to substitute or replace existing requirements, as defined in either the QAPD or company implementing instructions (Management Control Procedures). Instead, the guidelines are intended to provide a consolidated source of information addressing the issue of Suspect/Counterfeit materials. These guidelines provide an extensive suspect component listing and suspect indications listing. Users can quickly check their suspect items against the list of manufacturers products (i.e., type, LD. number, and nameplate information) by consulting either of these listings.

NONE

1995-09-01T23:59:59.000Z

25

Search for CP violation in hyperon decays.  

Science Conference Proceedings (OSTI)

Direct CP violation in nonleptonic hyperon decays can be established by comparing the decays of hyperons and anti-hyperons. For {Xi} decay to {Lambda} {pi} followed by {Lambda} to p{pi}, the proton distribution in the rest frame of Lambda is governed by the product of the decay parameters {alpha}{sub {Xi}} {alpha}{sub {Lambda}}. The asymmetry A{sub {Xi}{Lambda}}, proportional to the difference of {alpha}{sub {Xi}}{alpha}{sub {Lambda}} of the hyperon and anti-hyperon decays, vanishes if CP is conserved. We report on an analysis of a fraction of 1997 and 1999 data collected by the Hyper CP (E871) collaboration during the fixed-target runs at Fermilab. The preliminary measurement of the asymmetry is {Alpha}{sub {Xi}{Lambda}} = [-7 {+-} 12(stat) {+-} 6.2(sys)] x 10{sup -4}, an order of magnitude better than the present limit.

Zyla, Piotr; Chan, A.; Chen, Y.C.; Ho, C.; Teng, P.K.; Choong, W.S.; Gidal, G.; Fu, Y.; Gu, P.; Jones, T.D.; Luk, K.B.; Turko, B.; James, C.; Volk, J.; Felix, J.; Burnstein, R.A.; Chakrovorty, A.; Kaplan, D.M.; Lederman, L.M.; Luebke, W.; Rajaram, D.; Rubin, H.A.; Solomey, N.; Torun, Y.; White, C.G.; White, S.L.; Leros, N.; Perroud, J.P.; Gustafson, H.R.; Longo, M.J.; Lopez, F.; Park H.K.; Clark, K.; Jenkins, M.; Dukes, E.C.; Durandet, C.; Holmstrom, T.; Huang, M.; Lu, L.; Nelson, K.S.

2002-10-25T23:59:59.000Z

26

It's Elemental - Isotopes of the Element Copernicium  

NLE Websites -- All DOE Office Websites (Extended Search)

Available 278 No Data Available Alpha Decay (suspected) No Data Available Spontaneous Fission (suspected) No Data Available 279 No Data Available Spontaneous Fission (suspected)...

27

Measurement of branching fractions of B decays to K1(1270)pi and K1(1400)pi and determination of the CKM angle alpha from B0 --> a1(1260) - pi-  

SciTech Connect

In the Standard Model, CP violation in weak interactions involving quarks is parameterized by an irreducible complex phase in the Cabibbo-Kobayashi-Maskawa (CKM) quark-mixing-matrix. The precise determination of the CKM elements is a necessary ingredient for a stringent test of the Standard Model predictions, and is a crucial input for reducing the theoretical error in many New Physics searches with flavor, e.g., in the kaon sector. The unitarity of the CKM matrix is typically expressed as a triangle relationship among its parameters, where the area of the so-called Unitarity Triangle visually depicts the amount of asymmetry between the decays of B particles and their antimatter counterparts. In the past few years, the BABAR and Belle experiments have been able to measure all three angles of the triangle from CP asymmetry measurements. The first asymmetry measurements in B particle decays, about ten years ago, allowed to determine {beta}, which is now known to better than 5% precision. The angles {alpha} and {gamma}, measured in much rarer processes, required several years of data taking before analyses could yield reliable answers. A remarkable feature is that the direct measurement of the angles of the Unitarity Triangle generates an area that is consistent with the area predicted by measurement of the sides. In this thesis we have presented the branching fraction measurements of charged and neutral B meson decays to K{sub 1}(1270){pi} and K{sub 1}(1400){pi}, obtained from a data sample of 454 million {Upsilon}(4S) {yields} B{bar B} events. This analysis is particularly challenging from the experimental side since the branching fractions involved are very low, at the level of 10{sup -6} - 10{sup -7}, and the signal is characterized by the simultaneous presence of two overlapping resonances, which exhibit sizeable interference effects. The combined K{sub 1}(1270){pi} and K{sub 1}(1400){pi} signal is therefore modeled with a K-matrix formalism, which accounts for the effects of interference between the K{sub 1}(1270) and K{sub 1}(1400) mesons by introducing two effective parameters. The model is derived from the analysis, performed by the ACCMOR Collaboration, of the diffractive production of strange mesons.

Stracka, Simone; /Milan U. /SLAC

2011-02-07T23:59:59.000Z

28

Rare Decays of the $?^{'}$  

E-Print Network (OSTI)

We have searched for the rare decays of the eta prime meson to e+ e- eta, e+ e- pizero, e+ e- gamma, and e mu in hadronic events at the CLEO II detector. The search is conducted on 4.80 fb^-1 of e+ e- collisions at the Cornell Electron Storage Ring. We find no signal in any of these modes, and set 90% confidence level upper limits on their branching fractions of 2.4 X 10^-3, 1.4 X 10^-3, 0.9 X 10^-3, and 4.7 X 10^-4, respectively. We also investigate the Dalitz plot of the common decay of the eta prime to pi+ pi- eta. We fit the matrix element with the Particle Data Group parameterization and find Re(alpha) = -0.021 +- 0.025, where alpha is a linear function of the kinetic energy of the eta.

R. A. Briere

1999-07-23T23:59:59.000Z

29

It's Elemental - Isotopes of the Element Ununseptium  

NLE Websites -- All DOE Office Websites (Extended Search)

Number Half-life Decay Mode Branching Percentage 291 No Data Available Spontaneous Fission (suspected) No Data Available Alpha Decay (suspected) No Data Available 292 No Data...

30

The strong coupling from tau decays without prejudice  

E-Print Network (OSTI)

We review our recent determination of the strong coupling \\alpha_s from the OPAL data for non-strange hadronic tau decays. We find that \\alpha_s(m^2_\\tau) =0.325+-0.018 using fixed-order perturbation theory, and \\alpha_s(m^2_\\tau)=0.347+-0.025 using contour-improved perturbation theory. At present, these values supersede any earlier determinations of the strong coupling from hadronic tau decays, including those from ALEPH data.

Boito, Diogo; Jamin, Matthias; Mahdavi, Andisheh; Maltman, Kim; Osborne, James; Peris, Santiago

2012-01-01T23:59:59.000Z

31

Workshop on Precision Measurements of $\\alpha_s$  

Science Conference Proceedings (OSTI)

These are the proceedings of the Workshop on Precision Measurements of {alpha}{sub s} held at the Max-Planck-Institute for Physics, Munich, February 9-11, 2011. The workshop explored in depth the determination of {alpha}{sub s}(m{sub Z}) in the {ovr MS} scheme from the key categories where high precision measurements are currently being made, including DIS and global PDF fits, {tau}-decays, electro-weak precision observables and Z-decays, event-shapes, and lattice QCD. These proceedings contain a short summary contribution from the speakers, as well as the lists of authors, conveners, participants, and talks.

Bethke, Siegfried; /Munich, Max Planck Inst.; Hoang, Andre H.; /Vienna U.; Kluth, Stefan; /Munich, Max Planck Inst.; Schieck, Jochen; /Munich U.; Stewart, Iain W.; Aoki, S.; Beneke, M.; Bethke, S.; Blumlein, J.; Brambilla, N.; Brodsky, S.; /MIT, LNS

2011-10-01T23:59:59.000Z

32

Decay Study of {sup 257}Rf  

Science Conference Proceedings (OSTI)

The isotope {sup 257}Rf was produced in the fusion-evaporation reaction {sup 208}Pb({sup 50}Ti, n){sup 257}Rf. Reaction products were separated by the Argonne Fragment Mass Analyzer. Radioactive decay and spontaneous fission of {sup 257}Rf and its decay products were investigated. An isomeric state in {sup 257}Rf, with a half-life of 160{sub -31}{sup 42} {mu}S, was discovered by detecting internal conversion electrons followed by alpha decays. It is interpreted as a three-quasiparticle high-K isomer. A second group of internal-conversion electrons which were succeeded by alpha decay, with a half-life of 4.1{sub -1.3}{sup +2.4} s, was observed. These events might originate from the decay of excited states in {sup 257}Lr, populated by electron-capture decay of {sup 257}Rf, or from another isomer in {sup 257}Rf.

Qian, J.; Heinz, A.; Winkler, R. [Yale University, New Haven, CT 06511 (United States); Janssens, R. V. F.; Khoo, T. L.; Seweryniak, D.; Peterson, D.; Back, B. B.; Carpenter, M. P.; Greene, J. P.; Jiang, C. L.; Kondev, F. G.; Lauritsen, T.; Lister, C. J.; Pardo, R. C.; Robinson, A.; Scott, R.; Vondrasek, R.; Wang, X.; Zhu, S. [Argonne National Laboratory, Argonne, IL 60439 (United States)] (and others)

2009-03-04T23:59:59.000Z

33

B Decay  

NLE Websites -- All DOE Office Websites (Extended Search)

Decay Decay B mesons are short-lived and decay inside the beam pipe, which is about 2.5 cm (1 inch) in diameter. Physicists project the tracks seen in the detector elements outside the beampipe back to where the particles must have traveled inside the beam pipe. We call a point where particles collide or decay a vertex. A way to identify a B meson is to look for two vertices with a gap between them. On the left is a standard event picture. On the right is a blowup of what happens close to the collision point inside the beam pipe. The vertex is where the B meson along with other particles was created and the secondary vertex is where it decayed. The solid green lines are the actual tracks of the decay particles outside the beam pipe. The dotted lines are the projection of the tracks into the beam pipe. Where they intersect are the vertices. The B travels between the first vertex and the secondary vertex along the black dotted line before it decays. Thus, the gap between the two vertices is a measure of the lifetime of the B meson. We will be looking for this decay length in our data. We will find a minimum or "threshold" value that will tell us to save events for further analysis.

34

Bounds on Heavy-to-Heavy Weak Decay Form Factors  

E-Print Network (OSTI)

We provide upper and lower bounds on the semileptonic weak decay form factors for $B \\to D^(*)$ and $\\Lambda_b \\to \\Lambda_c$ decays by utilizing inclusive heavy quark effective theory sum rules. These bounds are calculated to second order in $\\Lambda_{QCD}/m_Q$ and first order in $\\alpha_s$. The $O(\\alpha_s^2 \\beta_0)$ corrections to the bounds at zero recoil are also presented.

Chiang, C W

2001-01-01T23:59:59.000Z

35

Bounds on Heavy-to-Heavy Weak Decay Form Factors  

E-Print Network (OSTI)

We provide upper and lower bounds on the semileptonic weak decay form factors for $B \\to D^(*)$ and $\\Lambda_b \\to \\Lambda_c$ decays by utilizing inclusive heavy quark effective theory sum rules. These bounds are calculated to second order in $\\Lambda_{QCD}/m_Q$ and first order in $\\alpha_s$. The $O(\\alpha_s^2 \\beta_0)$ corrections to the bounds at zero recoil are also presented.

Cheng-Wei Chiang

2000-09-18T23:59:59.000Z

36

H Decay  

NLE Websites -- All DOE Office Websites (Extended Search)

Suspects . . . er Candidates Suspects . . . er Candidates Two huge physics task forces, CDF and DZero, are after the Higgs at Fermilab. They will be looking for events with b quarks and Ws as candidate Higgs events. More about candidate events. To learn more about Higgs, check out: Politics, Solid State and the Higgs by David Miller, and the cartoon version. Also good reading: The Search for Higgs in Beamline, March 2001. You and your classmates will join the particle hunt by doing a sweep for evidence through CDF data to learn how to identify bs and Ws. You will be looking for minimum or "threshold" values for certain parameters. Also, you will learn something about the data analysis that must be done after the candidate events are identified to determine the value of the mass. Be sure to keep notes on all your work.

37

The Particle Adventure | Particle decays and annihiliations | Confusion  

NLE Websites -- All DOE Office Websites (Extended Search)

Confusion about Confusion about decays Confusion about decays Many heavy elements decay into simpler things. But a close observation of these decays reveals several confusing problems. Consider uranium-238 decay. A lump of uranium-238 will decay at a constant rate such that in 4,460,000,000 years -- give or take a few days -- half the uranium will be gone. But there is no way to tell when a specific uranium atom will decay; it could decay five minutes from now, or in ten billion years. Why will an atom decay only according to some probability? Uranium-238 has a mass of 238.0508 atomic mass units (u). It can decay into thorium (234.0436 u) and an alpha particle (4.0026 u). But uranium's mass minus the mass of its decay products is 0.0046 u. Why is there missing mass?

38

Suspect and Counterfeit Items Memo | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

(SCI), specifically electronic components and integrated circuits, is an increasing problem throughout the nuclear industry. Suspect and Counterfeit Items Memo More Documents...

39

Alpha Radiation  

NLE Websites -- All DOE Office Websites (Extended Search)

Basics of Radiation Basics of Radiation Gamma Radiation and X-Rays Beta Radiation Alpha Radiation Irradiation Radioactive Contamination Definitions Detection Measurement Safety Around Radiation Sources Types of Radiation Exposure Managing Radiation Emergencies Basics of Radiation Characteristics of Alpha Radiation 1. Alpha radiation is not able to penetrate skin. 2. Alpha-emitting materials can be harmful to humans if the materials are inhaled, swallowed, or absorbed through open wounds. 3. A variety of instruments have been designed to measure alpha radiation. Special training in use of these instruments is essential for making accurate measurements. 4. A civil defense instrument (CD V-700) cannot detect the presence of radioactive materials that produce alpha radiation unless the radioactive materials also produce beta and/or gamma radiation.

40

Rare Decays of the $\\eta^{'}$  

E-Print Network (OSTI)

We have searched for the rare decays of the eta prime meson to e+ e- eta, e+ e- pizero, e+ e- gamma, and e mu in hadronic events at the CLEO II detector. The search is conducted on 4.80 fb^-1 of e+ e- collisions at the Cornell Electron Storage Ring. We find no signal in any of these modes, and set 90% confidence level upper limits on their branching fractions of 2.4 X 10^-3, 1.4 X 10^-3, 0.9 X 10^-3, and 4.7 X 10^-4, respectively. We also investigate the Dalitz plot of the common decay of the eta prime to pi+ pi- eta. We fit the matrix element with the Particle Data Group parameterization and find Re(alpha) = -0.021 +- 0.025, where alpha is a linear function of the kinetic energy of the eta.

Briere, R A; Ford, W T; Gritsan, A; Krieg, H; Roy, J D; Smith, J G; Alexander, J P; Baker, R; Bebek, C; Berger, B E; Berkelman, K; Blanc, F; Boisvert, V; Cassel, David G; Dickson, M; Von Dombrowski, S; Drell, P S; Ecklund, K M; Ehrlich, R; Foland, A D; Gaidarev, P B; Galik, R S; Gibbons, L K; Gittelman, B; Gray, S W; Hartill, D L; Heltsley, B K; Hopman, P I; Jones, C D; Kreinick, D L; Lee, T; Liu, Y; Meyer, T O; Mistry, N B; Ng, C R; Nordberg, E; Patterson, J R; Peterson, D; Riley, D; Thayer, J G; Thies, P G; Valant-Spaight, B L; Warburton, A; Avery, P; Lohner, M; Prescott, C; Rubiera, A I; Yelton, J; Zheng, J; Brandenburg, G; Ershov, A; Gao, Y S; Kim, D Y J; Wilson, R; Browder, T E; Li, Y; Rodrguez, J L; Yamamoto, H; Bergfeld, T; Eisenstein, B I; Ernst, J; Gladding, G E; Gollin, G D; Hans, R M; Johnson, E; Karliner, I; Marsh, M A; Palmer, M; Plager, C; Sedlack, C; Selen, M; Thaler, J J; Williams, J; Edwards, K W; Janicek, R; Patel, P M; Sadoff, A J; Ammar, R; Baringer, P; Bean, A; Besson, D; Coppage, D; Davis, R; Kotov, S A; Kravchenko, I V; Kwak, N; Zhao, X; Anderson, S; Frolov, V V; Kubota, Y; Lee, S J; Mahapatra, R; O'Neill, J J; Poling, R A; Riehle, T; Smith, A; Ahmed, S; Alam, M S; Athar, S B; Jian, L; Ling, L; Mahmood, A H; Saleem, M; Timm, S; Wappler, F; Anastassov, A; Duboscq, J E; Gan, K K; Gwon, C; Hart, T; Honscheid, K; Kagan, H; Kass, R; Lorenc, J; Schwarthoff, H; Spencer, M B; Von Trne, E; Zoeller, M M; Richichi, S J; Severini, H; Skubic, P L; Undrus, A E; Bishai, M; Chen, S; Fast, J; Hinson, J W; Lee, J; Menon, N; Miller, D H; Shibata, E I; Shipsey, I P J; Kwon, Y; Lyon, A L; Thorndike, E H; Jessop, C P; Lingel, K; Marsiske, H; Perl, Martin Lewis; Savinov, V; Ugolini, D W; Zhou, X; Coan, T E; Fadeev, V; Korolkov, I Ya; Maravin, Y; Narsky, I; Stroynowski, R; Ye, J; Wlodek, T; Artuso, M; Ayad, R; Dambasuren, E; Kopp, S E; Majumder, G; Moneti, G C; Mountain, R; Schuh, S; Skwarnicki, T; Stone, S; Titov, A; Viehhauser, G; Wang, J C; Wolf, A; Wu, J; Csorna, S E; McLean, K W; Marka, S; Xu, Z; Godang, R; Kinoshita, K; Lai, I C; Pomianowski, P A; Schrenk, S; Bonvicini, G; Cinabro, D; Greene, R; Perera, L P; Zhou, G J; Chan, S; Eigen, G; Lipeles, E; Schmidtler, M; Shapiro, A; Sun, W M; Urheim, J; Weinstein, A J; Wrthwein, F; Jaffe, D E; Masek, G E; Paar, H P; Potter, E M; Prell, S; Sharma, V; Asner, D M; Eppich, A; Gronberg, J B; Hill, T S; Lange, D J; Morrison, R J; Nelson, T K; Richman, J D; Roberts, D

2000-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "alpha decay suspected" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

It's Elemental - Isotopes of the Element Curium  

NLE Websites -- All DOE Office Websites (Extended Search)

Capture 80.00% Alpha Decay 20.00% 234 51 seconds Alpha Decay 40.00% Spontaneous Fission 40.00% Electron Capture 20.00% 235 No Data Available Alpha Decay (suspected) No...

42

It's Elemental - Isotopes of the Element Einsteinium  

NLE Websites -- All DOE Office Websites (Extended Search)

Alpha Decay (suspected) No Data Available Electron Capture (suspected) No Data Available 241 8 seconds Electron Capture No Data Available Alpha Decay No Data Available 242 17.8...

43

Measurement of branching fractions of B decays to K [subscript 1] (1270) pi and K [subscript 1] (1400) pi and determination of the CKM angle Alpha from B [superscript 0]--> a [subscript 1] (1260) (+/-) pi (-/+)  

E-Print Network (OSTI)

We report measurements of the branching fractions of neutral and charged B meson decays to final states containing a K1(1270) or K1(1400) meson and a charged pion. The data, collected with the BABAR detector at the SLAC ...

Fisher, Peter H.

44

Semileptonic Decays  

SciTech Connect

The following is an overview of the measurements of the CKM matrix elements |V{sub cb}| and |V{sub ub}| that are based on detailed studies of semileptonic B decays by the BABAR and Belle Collaborations and major advances in QCD calculations. In addition, a new and improved measurement of the ratios R(D{sup (*)}) = {Beta}({bar B} {yields} D{sup (*)}{tau}{sup -}{bar {nu}}{sub {tau}})/{Beta}({bar B} {yields} D{sup (*)}{ell}{sup -}{bar {nu}}{sub {ell}}) is presented. Here D{sup (*)} refers to a D or a D* meson and {ell} is either e or {mu}. The results, R(D) = 0.440 {+-} 0.058 {+-} 0.042 and R(D*) = 0.332 {+-} 0.024 {+-} 0.018, exceed the Standard Model expectations by 2.0{sigma} and 2.7{sigma}, respectively. Taken together, they disagree with these expectations at the 3.4{sigma} level. The excess of events cannot be explained by a charged Higgs boson in the type II two-Higgs-doublet model.

Luth, Vera G.; /SLAC

2012-10-02T23:59:59.000Z

45

Alternative A(H1N1) suspects management  

Science Conference Proceedings (OSTI)

This paper deals with the differential diagnostics process behind the verdict of AH1N1 infection or not for the swine flu suspects. The application was designed as a support for doctors was built with ASP.NET 3.5 technology, the broad spectrum development ... Keywords: A(H1N1), application, charts, diagnostic, management

Dan Adrian Marior; Radu Zglimbea; Constantin Crciumaru

2010-08-01T23:59:59.000Z

46

It's Elemental - Isotopes of the Element Seaborgium  

NLE Websites -- All DOE Office Websites (Extended Search)

Mass Number Half-life Decay Mode Branching Percentage 258 2.9 milliseconds Spontaneous Fission < 100.00% Alpha Decay (suspected) No Data Available 259 0.32 seconds Alpha Decay...

47

High-statistics measurement of the beta-delayed alpha spectrum of 20Na  

E-Print Network (OSTI)

A measurement of the 20Na beta-delayed alpha spectrum with a high-granularity set-up has allowed the decay scheme to be revised on several points. Three new transitions of low intensity are found at low alpha-particle energy. An R-matrix fit of the complete spectrum gives an improved description of the decay and indicates feeding to the broad 2^+ alpha-cluster state close to 9 MeV.

K. L. Laursen; O. S. Kirsebom; H. O. U. Fynbo; A. Jokinen; M. Madurga; K. Riisager.; A. Saastamoinen; O. Tengblad; J. ysto

2013-04-09T23:59:59.000Z

48

Scintillating bolometers for Double Beta Decay search  

E-Print Network (OSTI)

In the field of Double Beta Decay (DBD) searches, the use of high resolution detectors in which background can be actively discriminated is very appealing. Scintillating bolometers containing a Double Beta Decay emitter can largely fulfill this very interesting possibility. In this paper we present the latest results obtained with CdWO4 and CaMoO4 crystals. Moreover we report, for the first time, a very interesting feature of CaMoO4 bolometers: the possibility to discriminate beta-gamma events from those induced by alpha particles thanks to different thermal pulse shape.

Gironi, Luca

2009-01-01T23:59:59.000Z

49

Scintillating bolometers for Double Beta Decay search  

E-Print Network (OSTI)

In the field of Double Beta Decay (DBD) searches, the use of high resolution detectors in which background can be actively discriminated is very appealing. Scintillating bolometers containing a Double Beta Decay emitter can largely fulfill this very interesting possibility. In this paper we present the latest results obtained with CdWO4 and CaMoO4 crystals. Moreover we report, for the first time, a very interesting feature of CaMoO4 bolometers: the possibility to discriminate beta-gamma events from those induced by alpha particles thanks to different thermal pulse shape.

Luca Gironi

2009-11-05T23:59:59.000Z

50

Observation of Parity Violation in the Omega-minus -> Lambda + K-minus Decay  

E-Print Network (OSTI)

The alpha decay parameter in the process Omega-minus -> Lambda + K-minus has been measured from a sample of 4.50 million unpolarized Omega-minus decays recorded by the HyperCP (E871) experiment at Fermilab and found to be [1.78 +/- 0.19(stat) +/- 0.16(syst)]{\\times}10^{-2}. This is the first unambiguous evidence for a nonzero alpha decay parameter, and hence parity violation, in the Omega-minus -> Lambda + K-minus decay.

Lu, L C; Chakravorty, A; Chen, Y C; Choong, W S; Clark, K; Dukes, E C; Durandet, C; Flix, J; Fu, Y; Gidal, G; Gustafson, H R; Holmstrom, T; Huang, M; James, C; Jenkins, C M; Jones, T D; Kaplan, D M; Longo, M J; Luebke, W; Luk, K B; Nelson, K S; Park, H K; Perroud, Jean-Pierre; Rajaram, D; Rubin, H A; Volk, J; White, C G; White, S L; Zyla, P

2005-01-01T23:59:59.000Z

51

Observation of Parity Violation in the Omega-minus -> Lambda + K-minus Decay  

E-Print Network (OSTI)

The alpha decay parameter in the process Omega-minus -> Lambda + K-minus has been measured from a sample of 4.50 million unpolarized Omega-minus decays recorded by the HyperCP (E871) experiment at Fermilab and found to be [1.78 +/- 0.19(stat) +/- 0.16(syst)]{\\times}10^{-2}. This is the first unambiguous evidence for a nonzero alpha decay parameter, and hence parity violation, in the Omega-minus -> Lambda + K-minus decay.

HyperCP Collaboration; L. C. Lu; R. A. Burnstein; A. Chakravorty; Y. C. Chen; W. -S. Choong; K. Clark; E. C. Dukes; C. Durandet; J. Felix; Y. Fu; G. Gidal; H. R. Gustafson; T. Holmstrom; M. Huang; C. James; C. M. Jenkins; T. D. Jones; D. M. Kaplan; M. J. Longo; W. Luebke; K. -B. Luk; K. S. Nelson; H. K. Park; J. -P. Perroud; D. Rajaram; H. A. Rubin; J. Volk; C. G. White; S. L. White; P. Zyla

2005-05-06T23:59:59.000Z

52

2p-2p decay of {sup 8}C and isospin-allowed 2p decay of the isobaric-analog state in {sup 8}B  

Science Conference Proceedings (OSTI)

{sup 8}C is found to decay to four protons and an {alpha} particle in two 2p emission steps. The correlations between the protons in the first step ({sup 8}C to {sup 6}Be) exhibit a significant enhancement in the region of the decay phase space where the two protons have small relative energy, a region sometimes called the diproton region. The decay of the isobaric analog of {sup 8}C in {sup 8}B is also found to decay by 2p emission. This is the first case of isospin-allowed 2p decay between isobaric analog states.

Charity, R. J.; Elson, J. M. [Department of Chemistry, Washington University, St. Louis, Missouri 63130 (United States); Manfredi, J.; Shane, R. [Department of Physics, Washington University, St. Louis, Missouri 63130 (United States); Sobotka, L. G. [Department of Chemistry, Washington University, St. Louis, Missouri 63130 (United States); Department of Physics, Washington University, St. Louis, Missouri 63130 (United States); Chajecki, Z.; Coupland, D.; Iwasaki, H.; Kilburn, M.; Lee, Jenny; Lynch, W. G.; Sanetullaev, A.; Tsang, M. B.; Winkelbauer, J.; Youngs, M. [Department of Physics and Astronomy, National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824 (United States); Marley, S. T.; Shetty, D. V.; Wuosmaa, A. H. [Department of Physics, Western Michigan University, Kalamazoo, Michigan 49008 (United States); Ghosh, T. K. [Variable Energy Cyclotron Centre, 1/AF Bidhannagar, Kolkata 700064 (India); Howard, M. E. [Department of Physics and Astronomy, Rutgers University, New Brunswick, New Jersey 08903 (United States)

2010-10-15T23:59:59.000Z

53

Glossary Term - Beta Decay  

NLE Websites -- All DOE Office Websites (Extended Search)

Avogadro's Number Avogadro's Number Previous Term (Avogadro's Number) Glossary Main Index Next Term (Beta Particle) Beta Particle Beta Decay Beta decay results in the emission of an electron and antineutrino, or a positron and neutrino. Beta decay is one process that unstable atoms can use to become more stable. There are two types of beta decay, beta-minus and beta-plus. During beta-minus decay, a neutron in an atom's nucleus turns into a proton, an electron and an antineutrino. The electron and antineutrino fly away from the nucleus, which now has one more proton than it started with. Since an atom gains a proton during beta-minus decay, it changes from one element to another. For example, after undergoing beta-minus decay, an atom of carbon (with 6 protons) becomes an atom of nitrogen (with 7 protons).

54

CP violation in strange baryon decays: A report from Fermilab experiment 871  

SciTech Connect

Fermilab experiment 871, HyperCP, is a search for direct CP violation in {xi} and {lambda} hyperon decays. A non-zero value in the asymmetry parameter A, defined in terms of the decay parameter products {alpha}{sub {xi}}{alpha}{sub {lambda}} and {alpha}{sub {xi}}-bar{alpha}{sub {lambda}}-bar, would be unambiguous evidence for direct CP violation. The first data-taking run finished at the end of 1997 and accumulated over one billion {xi}{sup -} and {xi}-bar{sup +} decays. A sensitivity in A of {approx_equal}10{sup -4} is expected. A review of CP violation in hyperon decays is given, the HyperCP detector is described, and the status of the data analysis is discussed.

James, C.; Volk, J. [Fermi National Accelerator Laboratory, Batavia, Illinois 60510 (United States); Burnstein, R. A.; Chakravorty, A.; Kaplan, D. M.; Lederman, L. M.; Luebke, W.; Rajaram, D.; Rubin, H. A.; White, C. G.; White, S. L. [Illinois Institute of Technology, Chicago, Illinois 60616 (United States); Chan, A.; Chen, Y. C.; Ho, C.; Teng, P. K. [Academia Sinica, Nankang, Taipei 11529, Taiwan (China); Choong, W. S.; Fuzesy, R.; Gidal, G.; Luk, K. B.; Turko, B. [University of California and Lawrence Berkeley Laboratory, Berkeley, California 94720 (United States)] (and others)

1999-02-17T23:59:59.000Z

55

Apparatus for detecting alpha radiation in difficult access areas  

DOE Patents (OSTI)

An electrostatic alpha radiation detector for measuring alpha radiation emitted from inside an enclosure comprising an electrically conductive expandable electrode for insertion into the enclosure. After insertion, the electrically conductive expandable electrode is insulated from the enclosure and defines a decay cavity between the electrically conductive expandable electrode and the enclosure so that air ions generated in the decay cavity are electrostatically captured by the electrically conductive expandable electrode and the enclosure when an electric potential is applied between the electrically conductive expandable electrode and the enclosure. Indicator means are attached to the electrically conductive expandable electrode for indicating an electrical current produced by generation of the air ions generated in the decay cavity by collisions between air molecules and the alpha particles emitted from the enclosure. A voltage source is connected between the indicator means and the electrically conductive enclosure for creating an electric field between the electrically conductive expandable electrode and the enclosure.

Steadman, Peter (Santa Fe, NM); MacArthur, Duncan W. (Los Alamos, NM)

1997-09-02T23:59:59.000Z

56

Delayed Nickel Decay in Gamma Ray Bursts  

E-Print Network (OSTI)

Recently observed emission lines in the X-ray afterglow of gamma ray bursts suggest that iron group elements are either produced in the gamma ray burst, or are present nearby. If this material is the product of a thermonuclear burn, then such material would be expected to be rich in Nickel-56. If the nickel remains partially ionized, this prevents the electron capture reaction normally associated with the decay of Nickel-56, dramatically increasing the decay timescale. Here we examine the consequences of rapid ejection of a fraction of a solar mass of iron group material from the center of a collapsar/hypernova. The exact rate of decay then depends on the details of the ionization and therefore the ejection process. Future observations of iron, nickel and cobalt lines can be used to diagnose the origin of these elements and to better understand the astrophysical site of gamma ray bursts. In this model, the X-ray lines of these iron-group elements could be detected in suspected hypernovae that did not produce an observable gamma ray burst due to beaming.

G. C. McLaughlin; R. A. M. J. Wijers

2002-05-19T23:59:59.000Z

57

Calculated /alpha/-induced thick target neutron yields and spectra, with comparison to measured data  

Science Conference Proceedings (OSTI)

One component of the neutron source associated with the decay of actinide nuclides in many environments is due to the interaction of decay /alpha/ particles in (/alpha/,n) reactions on low Z nuclides. Measurements of (/alpha/,n) thick target neutron yields and associated neutron spectra have been made for only a few combinations of /alpha/ energy and target nuclide or mixtures of actinide and target nuclides. Calculations of thick target neutron yields and spectra with the SOURCES code require /alpha/-energy-dependent cross sections for (/alpha/,n) reactions, as well as branching fractions leading to the energetically possible levels of the product nuclides. A library of these data has been accumulated for target nuclides of Z /le/ 15 using that available from measurements and from recent GNASH code calculations. SOURCES, assuming neutrons to be emitted isotopically in the center-of-mass system, uses libraries of /alpha/ stopping cross sections, (/alpha/,n) reaction cross reactions, product nuclide level branching fractions, and actinide decay /alpha/ spectra to calculate thick target (/alpha/,n) yields and neutron spectra for homogeneous combinations of nuclides. The code also calculates the thick target yield and angle intergrated neutron spectrum produced by /alpha/-particle beams on targets of homogeneous mixtures of nuclides. Illustrative calculated results are given and comparisons are made with measured thick target yields and spectra. 50 refs., 1 fig., 2 tabs.

Wilson, W.B.; Bozoian, M.; Perry, R.T.

1988-01-01T23:59:59.000Z

58

Nuclear diagnostic for fast alpha particles  

DOE Patents (OSTI)

Measurement of the velocity distribution of confined energetic alpha particles resulting from deuterium-tritium fusion reactions in a magnetically contained plasma is provided. The fusion plasma is seeded with energetic boron neutrals for producing, by means of the reaction .sup.10 B (.alpha.,n) .sup.13 N reaction, radioactive nitrogen nuclei which are then collected by a probe. The radioactivity of the probe is then measured by conventional techniques in determining the energy distribution of the alpha particles in the plasma. In a preferred embodiment, diborane gas (B.sub.2 H.sub.6) is the source of the boron neutrals to produce .sup.13 N which decays almost exclusively by positron emission with a convenient half-life of 10 minutes.

Grisham, Larry R. (Lawrence Township, Mercer County, NJ); Post, Jr., Douglass E. (Belle Mead, NJ); Dawson, John M. (Pacific Palisades, CA)

1986-01-01T23:59:59.000Z

59

The Oklo Constraints on Alpha-Decay Half-Lives  

E-Print Network (OSTI)

The Oklo data constrain the depth of the nuclear potential well to a small margin of error, determined by various unknowns, such as the reactor temperature. However, we show that even these small variations could allow the U-238 half-life to vary by more than one order of magnitude.

Chaffin, E

2003-01-01T23:59:59.000Z

60

ALPHA-DECAY STUDIES IN THE HEAVY-ELEMENT REGION  

E-Print Network (OSTI)

Mihelich. , Enet:gy Levels of Plutonium-239 Populated by thethe Nuclear Chemistry of Plutonium, Ame ricium, and CuriumThe mass analysis of the plutonium sample was made by Dr. M,

Hummel, John Philip

2010-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "alpha decay suspected" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

The Oklo Constraints on Alpha-Decay Half-Lives  

E-Print Network (OSTI)

The Oklo data constrain the depth of the nuclear potential well to a small margin of error, determined by various unknowns, such as the reactor temperature. However, we show that even these small variations could allow the U-238 half-life to vary by more than one order of magnitude.

E. Chaffin; J. Molgaard

2003-07-01T23:59:59.000Z

62

Special Study of The Department of Energy's Management of Suspect/Counterfeit Items  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

SPECIAL STUDY SPECIAL STUDY Independent Oversight Special Study of The Department of Energy's Management of Suspect/Counterfeit Items August 2003 OVERSIGHT Table of Contents EXECUTIVE SUMMARY ............................................................... 1 1.0 INTRODUCTION ...................................................................... 3 2.0 DOE HEADQUARTERS SUSPECT/COUNTERFEIT ITEM PROCESSES .................................................................... 6 3.0 IMPLEMENTATION OF SUSPECT/COUNTERFEIT ITEM REQUIREMENTS AT DOE SITES ................................. 13 4.0 CONCLUSIONS AND RECOMMENDATIONS ....................... 24 APPENDIX A - Supplemental Information ....................................... 30 Abbreviations Used in This Report CY Calendar Year DCIS Defense Criminal Investigative Service

63

Search for CP Violation in Charged-Xi and Lambda Hyperon Decays  

E-Print Network (OSTI)

We have compared the proton and antiproton angular distributions in 117 million Xi-minus -> Lambda + pi-minus -> proton + pi-minus + pi-minus and 41 million anti-Xi-minus -> anti-Lamba + pi-plus -> antiproton + pi-plus + pi-plus decays using a subset of the data from the HyperCP experiment (E871) at Fermilab. We find no evidence of CP violation, with the direct-CP-violating parameter $A_{\\Xi\\Lambda} = \\frac{\\alpha_{\\Xi}\\alpha_{\\Lambda} - \\bar{\\alpha}_{\\Xi}\\bar{\\alpha}_{\\Lambda}}{\\alpha_{\\Xi}\\alpha_{\\Lambda} + \\bar{\\alpha}_{\\Xi}\\bar{\\alpha}_{\\Lambda}} = [0.0+/-5.1(stat)+/-4.4(syst)]{\\times}10^{-4}$.

HyperCP Collaboration; T. Holmstrom; N. Leros; R. A. Burnstein; A. Chakravorty; A. Chan; Y. C. Chen; W. S. Choong; K. Clark; E. C. Dukes; C. Durandet; J. Felix; Y. Fu; G. Gidal; P. Gu; H. R. Gustafson; C. Ho; M. Huang; C. James; C. M. Jenkins; T. Jones; D. M. Kaplan; L. M. Lederman; M. J. Longo; F. Lopez; L. C. Lu; W. Luebke; K. B. Luk; K. S. Nelson; H. K. Park; J. P. Perroud; D. Rajaram; H. A. Rubin; P. K. Teng; J. Volk; C. G. White; S. L. White; P. Zyla

2004-12-13T23:59:59.000Z

64

Special Rreview of the Suspect/Counterfeit Items Program at the...  

NLE Websites -- All DOE Office Websites (Extended Search)

of Energy HSS Office of Health, Safety and Security ORO Oak Ridge Operations Office ORPS Occurrence Reporting and Processing System QA Quality Assurance SCI Suspect...

65

Control of Suspect/Counterfeit and Defective Items  

Science Conference Proceedings (OSTI)

This procedure implements portions of the requirements of MSC-MP-599, Quality Assurance Program Description. It establishes the Mission Support Alliance (MSA) practices for minimizing the introduction of and identifying, documenting, dispositioning, reporting, controlling, and disposing of suspect/counterfeit and defective items (S/CIs). employees whose work scope relates to Safety Systems (i.e., Safety Class [SC] or Safety Significant [SS] items), non-safety systems and other applications (i.e., General Service [GS]) where engineering has determined that their use could result in a potential safety hazard. MSA implements an effective Quality Assurance (QA) Program providing a comprehensive network of controls and verification providing defense-in-depth by preventing the introduction of S/CIs through the design, procurement, construction, operation, maintenance, and modification of processes. This procedure focuses on those safety systems, and other systems, including critical load paths of lifting equipment, where the introduction of S/CIs would have the greatest potential for creating unsafe conditions.

Sheriff, Marnelle L.

2013-09-03T23:59:59.000Z

66

B Decay Length  

NLE Websites -- All DOE Office Websites (Extended Search)

Threshold Decay Length Threshold Decay Length Data from 292 B events are in an Excel spreadsheet that looks like this table. To find the threshold decay length: Sort the data by descending decay lengths, dt. Run Event No. B Mass GeV/c2 ptB GeV/c dt cm Velocity v/c Lab Lifetime sec Rest Lifetime sec Bin 65160 642324 5.277 7.966 0.388 66500 89978 5.274 20.508 0.940 Get the data. Make a histogram of decay lengths. Rather than graphing all the lengths as individual points, physicists group the data. They consider the range of the data and divide it into "bins" of equal size. A histogram is a graph of the number of events in each bin vs. the bin range. We are looking for the smallest decay length that fits the exponential curve. This will indicate the length of the decay as detemined by that experimental run.

67

Spectrum and decays of kaonic hydrogen  

E-Print Network (OSTI)

By using the non-relativistic effective Lagrangian approach to bound states, a complete expression for the isospin-breaking corrections to the energy levels and the decay widths of kaonic hydrogen is obtained up-to-and-including O(alpha,m_d-m_u) in QCD. It is demonstrated that, although the leading-order corrections at O(alpha^{1/2},(m_d-m_u)^{1/2}) emerging due to the unitarity cusp, are huge, they can be expressed solely in terms of the KN S-wave scattering lengths. Consequently, at leading order, it is possible to derive parameter-free modified Deser-type relations, which can be used to extract the scattering lengths from the hadronic atom data.

Ulf-G. Meissner; Udit Raha; Akaki Rusetsky

2004-02-25T23:59:59.000Z

68

Looking for meson molecules in B decays  

SciTech Connect

We use the QCD sum rule approach to study a {eta} Prime - {pi} molecular current. We consider an isovector-scalar I{sup G}J{sup PC} = 1{sup -}0{sup ++} molecular current. We work at leading order in {alpha}{sub s} and consider the contributions of condensates up to dimension six. We obtain a mass around 1.1 GeV, consistent with a loosely bound state. We discuss the possibility of observing this molecular state in a B threebody hadronic decay.

Nielsen, Marina; Navarra, Fernando S. [Instituto de Fisica, Universidade de Sao Paulo, C.P. 66318, 05389-970 Sao Paulo, SP (Brazil); Bediaga, Ignacio [Centro Brasileiro de Pesquisas Fisicas, Rua Xavier Sigaud 150, 22290-180 Rio de Janeiro, RJ (Brazil)

2013-05-06T23:59:59.000Z

69

Application of spectral summing to indeterminate suspect low-level drums at Los Alamos National Laboratory  

Science Conference Proceedings (OSTI)

An analytical technique developed by Pajarito Scientific Corporation (PSC), utilizing spectral summing of spectra from groups of drums of similar waste type, is being employed by the Waste Disposition Project - Low Level Waste Disposal (WDP-LLWD) Group at Los Alamos National Laboratory (LANL). This technique has been used to disposition low-level radioactive waste that has dropped out of the transuranic (TRU) category and has no place to go unless it can be proven to be LLW and not TRU. The TRU program at LANL run by Mobile Characterization Services (MCS) employs two High Efficiency Neutron Counters (HENC) with built-in gamma assay systems to assay radioactive waste for shipment and disposal as TRU waste at the Waste Isolation Pilot Plant (WIPP) at Carlsbad, New Mexico. As well as being certified for WIPP assays, the HENC systems can also be used for low-level waste assays for disposal at LANL or off-site disposal facilities, such as the Nevada Test Site (NTS). Some of the waste processed through the HENC systems cannot be confinned TRU due to the absence of detected TRU alpha emitters above the TRU cutoff of 100 nCi/g. This waste becomes suspect low-level waste (SLLW). In many cases, the waste also can't be classified as LLW because the minimum detectable activity (MDA) of TRU radio nuclides is above the 100 nCi/g level. These wastes that do not have enough detectable TRU activity to be classified as TRU waste and have too high a MDA to be classified as LLW enter a radioactive waste characterization indetenninate status that prevents their dispositioning as either TRU waste or LLW. Spectral summing allows an experienced ganuna spectroscopy analyst to add the HENC gamma spectra of a number of similar waste items together to form a consolidated (summed) spectrum. This summed spectrum contains the assay results of the group of items rather than the individual item, and gamma peaks that were not discernable in the individual spectra can become quantifiable in the summed spectrum and the MDA for group sum is reduced. The group of waste items can then be properly classified as LLW based on the summed spectrum and valid assay values can be assigned for disposal. This technique has been successfully applied to a set of 52 debris drums - with individual MDA > 100 nCi/g - with a resulting group total TRU alpha activity concentration below 40nCi/g. Further application of the technique at LANL to other waste drums that are measured on a WIPP certified HENC system is planned and good candidate drum sets are being evaluated as indeterminate situations develop.

Gruetzmacher, Kathleen M [Los Alamos National Laboratory; Veilleux, John M [Los Alamos National Laboratory; Lucero, Randy P [PAJARITO SCIENTIFIC CORAPTION; Seamans, Jr., James V [PAJARITO SCIENTIFIC CORPORATION; Clapham, Martin J [PAJARITO SCIENTIFIC CORPORATION

2010-11-09T23:59:59.000Z

70

Application of spectral summing to indeterminate suspect low-level drums at Los Alamos National Laboratory  

Science Conference Proceedings (OSTI)

The spectral summing technique developed by Pajarito Scientific Corporation (PSC) is a unique modeling technique that is being employed by the Waste Disposition Project - Low Level Waste Disposition (WDP-LLWD) Group at Los Alamos National Laboratory (LANL). This technique has been used to disposition low-level radioactive waste that has dropped out of the transuranic (TRU) category and has no disposal path unless it can be proven to be LLW and not TRU. The TRU program at LANL run by Mobile Characterization Services (MCS) employs High Efficiency Neutron Counters (HENC) with built-in gamma assay systems to assay radioactive waste for shipment and disposal as TRU waste at the Waste Isolation Pilot Plant (WIPP) at Carlsbad, New Mexico. As well as being certified for WIPP assays, the HENC systems can also be used for low-level waste assays for disposal at LANL or off-site disposal facilities, such as the Nevada Test Site (NTS). Some of the waste processed through the HENC systems cannot be confirmed TRU due to the absence of detected TRU alpha emitters above the TRU cutoff of 100 nCi/g. This waste becomes suspect low-level waste (SLLW). In many cases, the waste also can't be classified as LLW because the minimum detectable activity (MDA) of TRU radionuclides is above the 100 nCi/g level. These wastes that do not have enough detectable TRU activity to be classified as TRU waste and have TRU MDAs > 100nCi/g enter a radioactive waste characterization indeterminate state that prevents their dispositioning as either TRU waste or LLW. Spectral summing allows an experienced gamma spectroscopy analyst to add the HENC gamma spectra of a number of similar waste items together to form a consolidated (summed) spectrum. This summed spectrum contains the assay results of the group of items rather than the individual item, and gamma peaks that were not discemable in the individual spectra become quantifiable in the summed spectrum and the MDA for the group sum is reduced. The group of waste items can then be properly classified as LLW waste on the summed spectrum and valid assay values can be assigned for disposal. This technique has been successfully applied to a set of 52 debris drums - with individual MDA > 100nCi/g - with a resulting group total TRU alpha activity concentration below 40nCi/g. Further application of the technique at LANL to other debris drums and sludge drums that were measured on a WIPP certified HENe is planned and good candidate drum sets are being evaluated.

Gruetzmacher, Kathleen M [Los Alamos National Laboratory; Veilleux, John M [Los Alamos National Laboratory; Lucero, Randy P [PAJARITO SCIENTIFIC CORPORATION; Seamans, Jr, J. V. [PAJARITO SCIENTIFIC CORPATION; Clapham, M. J. [PAJARITO SCIENTIFIC CORPORATION

2011-01-27T23:59:59.000Z

71

Suspect/Counterfeit Items Information Guide for Subcontractors/Suppliers  

Science Conference Proceedings (OSTI)

Counterfeiting of industrial and commercial grade items is an international problem that places worker safety, program objectives, expensive equipment, and security at risk. In order to prevent the introduction of Suspect/Counterfeit Items (S/CI), this information sheet is being made available as a guide to assist in the implementation of S/CI awareness and controls, in conjunction with subcontractor's/supplier's quality assurance programs. When it comes to counterfeit goods, including industrial materials, items, and equipment, no market is immune. Some manufactures have been known to misrepresent their products and intentionally use inferior materials and processes to manufacture substandard items, whose properties can significantly cart from established standards and specifications. These substandard items termed by the Department of Energy (DOE) as S/CI, pose immediate and potential threats to the safety of DOE and contractor workers, the public, and the environment. Failure of certain systems and processes caused by an S/CI could also have national security implications at Los Alamos National Laboratory (LANL). Nuclear Safety Rules (federal Laws), DOE Orders, and other regulations set forth requirements for DOE contractors to implement effective controls to assure that items and services meet specified requirements. This includes techniques to implement and thereby minimizing the potential threat of entry of S/CI to LANL. As a qualified supplier of goods or services to the LANL, your company will be required to establish and maintain effective controls to prevent the introduction of S/CI to LANL. This will require that your company warrant that all items (including their subassemblies, components, and parts) sold to LANL are genuine (i.e. not counterfeit), new, and unused, and conform to the requirements of the LANL purchase orders/contracts unless otherwise approved in writing to the Los Alamos National Security (LANS) contract administrator/procurements specialist.

Tessmar, Nancy D. [Los Alamos National Laboratory; Salazar, Michael J. [Los Alamos National Laboratory

2012-09-18T23:59:59.000Z

72

The search for proton decay  

Science Conference Proceedings (OSTI)

Following a very brief description of the theoretical developments which motivated the search for proton decay

R. Bionta; G. Blewitt; C. B. Bratton; D. Casper; B. G. Cortez; G. W. Foster; W. Gajewski; K. S. Ganezer; M. Goldhaber; T. J. Haines; T. W. Jones; D. Kielczewka; W. R. Kropp; J. G. Learned; E. Lehmann; J. M. LoSecco; H. S. Park; J. Shultz; S. Seidel; H. W. Sobel; J. L. Stone; L. R. Sulak; J. C. van der Velde

1984-01-01T23:59:59.000Z

73

It's Elemental - Isotopes of the Element Iridium  

NLE Websites -- All DOE Office Websites (Extended Search)

Percentage 164 94 microseconds Proton Emission > 0.00% Alpha Decay No Data Available Electron Capture No Data Available 165 1 microseconds Proton Emission (suspected) No Data...

74

Structure effects in the region of superheavy elements via the $?$-decay chain of $^{293}$118  

E-Print Network (OSTI)

The $\\alpha$-decay chain of $^{293}$118, first proposed in the Berkeley cold fusion experiment $^{208}$Pb($^{86}$Kr,1n) and now retracted, is calculated by using the preformed cluster model (PCM) of one of us (RKG). Also, the possible branchings of $\\alpha$-particles to heavier cluster decays of all the parents in this chain are calculated for the first time. The calculated Q-values, penetrabilities and preformation factors for $\\alpha$-decays suggest that the $^{285}$114 nucleus with Z=114, N=171 is a magic nucleus, either due to the magicity of Z=114, or of N=172 or of both. The N=172 is proposed to be a magic number in certain relativistic mean-field calculations, but with Z=120. The calculated cluster decays point to new interesting possibilities of $^{14}$C decay of the $^{281}$112 parent, giving rise to a (reasonably) deformed Z=106, N=161, $^{267}$106 daughter (N=162 being now established as the deformed magic shell) or to a doubly magic $^{48}$Ca cluster emitted from any of the parent nucleus in the $\\alpha$-decay chain. Apparently, these are exciting new directions for future experiments.

Raj K. Gupta; Sushil Kumar; Rajesh Kumar; M. Balasubramaniam; W. Scheid

2011-11-08T23:59:59.000Z

75

Automatically processed alpha-track radon monitor  

DOE Patents (OSTI)

An automatically processed alpha-track radon monitor is provided which includes a housing having an aperture allowing radon entry, and a filter that excludes the entry of radon daughters into the housing. A flexible track registration material is located within the housing that records alpha-particle emissions from the decay of radon and radon daughters inside the housing. The flexible track registration material is capable of being spliced such that the registration material from a plurality of monitors can be spliced into a single strip to facilitate automatic processing of the registration material from the plurality of monitors. A process for the automatic counting of radon registered by a radon monitor is also provided.

Langner, G.H. Jr.

1991-05-02T23:59:59.000Z

76

Suppressed Charmed B Decay  

SciTech Connect

This thesis describes the measurement of the branching fractions of the suppressed charmed B{sup 0} {yields} D{sup (*)-} a{sub 0}{sup +} decays and the non-resonant B{sup 0} {yields} D{sup (*)-} {eta}{pi}{sup +} decays in approximately 230 million {Upsilon}(4S) {yields} B{bar B} events. The data have been collected with the BABAR detector at the PEP-II B factory at the Stanford Linear Accelerator Center in California. Theoretical predictions of the branching fraction of the B{sup 0} {yields} D{sup (*)-} a{sub 0}{sup +} decays show large QCD model dependent uncertainties. Non-factorizing terms, in the naive factorization model, that can be calculated by QCD factorizing models have a large impact on the branching fraction of these decay modes. The predictions of the branching fractions are of the order of 10{sup -6}. The measurement of the branching fraction gives more insight into the theoretical models. In general a better understanding of QCD models will be necessary to conduct weak interaction physics at the next level. The presence of CP violation in electroweak interactions allows the differentiation between matter and antimatter in the laws of physics. In the Standard Model, CP violation is incorporated in the CKM matrix that describes the weak interaction between quarks. Relations amongst the CKM matrix elements are used to present the two relevant parameters as the apex of a triangle (Unitarity Triangle) in a complex plane. The over-constraining of the CKM triangle by experimental measurements is an important test of the Standard Model. At this moment no stringent direct measurements of the CKM angle {gamma}, one of the interior angles of the Unitarity Triangle, are available. The measurement of the angle {gamma} can be performed using the decays of neutral B mesons. The B{sup 0} {yields} D{sup (*)-} a{sub 0}{sup +} decay is sensitive to the angle {gamma} and, in comparison to the current decays that are being employed, could significantly enhance the measurement of this angle. However, the low expected branching fraction for the B{sup 0} {yields} D{sup (*)-} a{sub 0}{sup +} decay channels could severely impact the measurement. A prerequisite of the measurement of the CKM angle is the observation of the B{sup 0} {yields} D{sup (*)-} a{sub 0}{sup +} decay on which this thesis reports. The BABAR experiment consists of the BABAR detector and the PEP-II e{sup +}e{sup -} collider. The design of the experiment has been optimized for the study of CP violation in the decays of neutral B mesons but is also highly suitable for the search for rare B decays such as the B{sup 0} {yields} D{sup (*)-} a{sub 0}{sup +} decay. The PEP-II collider operates at the {Upsilon}(4S) resonance and is a clean source of B{bar B} meson pairs.

Snoek, Hella Leonie; /Vrije U., Amsterdam

2011-11-28T23:59:59.000Z

77

Gold Coated Lanthanide Phosphate Nanoparticles for Targeted Alpha Generator Radiotherapy  

Science Conference Proceedings (OSTI)

Targeted radiotherapies maximize cytotoxicty to cancer cells. In vivo generators such as 225Ac, which emits four particles in its decay chain, can significantly amplify the radiation dose delivered to the target site. However, renal dose from unbound 213Bi escaping during the decay process limits the dose of 225Ac that can be administered. Traditional chelating moieties are unable to sequester the radioactive daughters because of the high recoil energy from alpha particle emission. To counter this, we demonstrate that an engineered multilayered nanoparticle-antibody conjugate can both deliver radiation and contain the decay daughters of the in vivo -generator 225Ac while targeting biologically relevant receptors. These multi-shell nanoparticles combine the radiation resistance of crystalline lanthanide phosphate to encapsulate and contain 225Ac and its radioactive decay daughters, the magnetic properties of gadolinium phosphate for easy separation, and established surface chemistry of gold for attachment of nanoparticles to targeting antibodies.

McLaughlin, Mark F [ORNL; Woodward, Jonathan [ORNL; Boll, Rose Ann [ORNL; Wall, Jonathan [University of Tennessee, Knoxville (UTK); Rondinone, Adam Justin [ORNL; Kennel, Steve J [ORNL; Mirzadeh, Saed [ORNL; Robertson, David J. [University of Missouri

2013-01-01T23:59:59.000Z

78

Imaging alpha particle detector  

DOE Patents (OSTI)

A method and apparatus for detecting and imaging alpha particles sources is described. A conducting coated high voltage electrode (1) and a tungsten wire grid (2) constitute a diode configuration discharge generator for electrons dislodged from atoms or molecules located in between these electrodes when struck by alpha particles from a source (3) to be quantitatively or qualitatively analyzed. A thin polyester film window (4) allows the alpha particles to pass into the gas enclosure and the combination of the glass electrode, grid and window is light transparent such that the details of the source which is imaged with high resolution and sensitivity by the sparks produced can be observed visually as well. The source can be viewed directly, electronically counted or integrated over time using photographic methods. A significant increase in sensitivity over other alpha particle detectors is observed, and the device has very low sensitivity to gamma or beta emissions which might otherwise appear as noise on the alpha particle signal.

Anderson, David F. (Los Alamos, NM)

1985-01-01T23:59:59.000Z

79

Hyperon radiative decay  

SciTech Connect

The radiative decay widths of the low-lying strange baryons are calculated both within the relativistic quark bag model and the nonrelativistic potential model. These widths are found to depend sensitively upon the quark-model dynamics through multiplet mixing and q/sup 4/q-bar admixtures. The comparison between our calculated results and the very limited experimental data is discussed.

Kaxiras, E.; Moniz, E.J.; Soyeur, M.

1985-08-01T23:59:59.000Z

80

The Decay of Convective Turbulence  

Science Conference Proceedings (OSTI)

Using simulations with a large-eddy model we have studied the decay of convective turbulence in the atmospheric boundary layer when the upward surface sensible heat flux is suddenly stopped. The decay of turbulent kinetic energy and temperature ...

F. T. M. Nieuwstadt; R. A. Brost

1986-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "alpha decay suspected" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

alpha_s and the tau hadronic width: fixed-order, contour-improved and higher-order perturbation theory  

E-Print Network (OSTI)

The determination of $\\alpha_s$ from hadronic $\\tau$ decays is revisited, with a special emphasis on the question of higher-order perturbative corrections and different possibilities of resumming the perturbative series with the renormalisation group: fixed-order (FOPT) vs. contour-improved perturbation theory (CIPT). The difference between these approaches has evolved into a systematic effect that does not go away as higher orders in the perturbative expansion are added. We attempt to clarify under which circumstances one or the other approach provides a better approximation to the true result. To this end, we propose to describe the Adler function series by a model that includes the exactly known coefficients and theoretical constraints on the large-order behaviour originating from the operator product expansion and the renormalisation group. Within this framework we find that while CIPT is unable to account for the fully resummed series, FOPT smoothly approaches the Borel sum, before the expected divergent behaviour sets in at even higher orders. Employing FOPT up to the fifth order to determine $\\alpha_s$ in the $\\MSb$ scheme, we obtain $\\alpha_s(M_\\tau)=0.320 {}^{+0.012}_{-0.007}$, corresponding to $\\alpha_s(M_Z) = 0.1185 {}^{+0.0014}_{-0.0009}$. Improving this result by including yet higher orders from our model yields $\\alpha_s(M_\\tau)=0.316 \\pm 0.006$, which after evolution leads to $\\alpha_s(M_Z) = 0.1180 \\pm 0.0008$. Our results are lower than previous values obtained from $\\tau$ decays.

Martin Beneke; Matthias Jamin

2008-06-19T23:59:59.000Z

82

Handbook on string decay  

E-Print Network (OSTI)

We explain simple semi-classical rules to estimate the lifetime of any given highly-excited quantum state of the string spectrum in flat spacetime. We discuss both the decays by splitting into two massive states and by massless emission. As an application, we study a solution describing a rotating and pulsating ellipse which becomes folded at an instant of time -- the ``squashing ellipse''. This string interpolates between the folded string with maximum angular momentum and the pulsating circular string. We explicitly compute the quantum decay rate for the corresponding quantum state, and verify the basic rules that we propose. Finally, we give a more general (4-parameter) family of closed string solutions representing rotating and pulsating elliptical strings.

Roberto Iengo; Jorge G. Russo

2006-01-11T23:59:59.000Z

83

Search for B+ meson decay to a1+ K*0  

SciTech Connect

We present a search for the decay B{sup +} --> {alpha}{sup +}{sub 1}(1260)K*{sup 0}(892). The data, collected with the BABAR detector at the SLAC National Accelerator Laboratory, represent 465 million B{anti B} pairs produced in e{sup +}e{sup -} annihilation at the energy of the {Upsilon}(4S). We find no significant signal and set an upper limit at 90% confidence level on the product of branching fractions B(B{sup +} --> {alpha}{sup +}{sub 1}(1260)K*{sup 0}(892)) x B({alpha}{sup +}{sub 1}(1260) --> {pi}{sup +}{pi}{sup -}{pi}{sup +}) of 1.8 x 10{sup -6}.

del Amo Sanchez, P.; Lees, J.P.; Poireau, V.; Prencipe, E.; Tisserand, V.; /Annecy, LAPP; Garra Tico, J.; Grauges, E.; /Barcelona U., ECM; Martinelli, M.; Palano, A.; Pappagallo, M.; /INFN, Bari /Bari U.; Eigen, G.; Stugu, B.; Sun, L.; /Bergen U.; Battaglia, M.; Brown, D.N.; Hooberman, B.; Kerth, L.T.; Kolomensky, Yu.G.; Lynch, G.; Osipenkov, I.L.; Tanabe, T.; /UC, Berkeley /Birmingham U. /Ruhr U., Bochum /British Columbia U. /Brunel U. /Novosibirsk, IYF /UC, Irvine /UC, Riverside /UC, Santa Barbara /UC, Santa Cruz /Caltech /Cincinnati U. /Colorado U. /Colorado State U. /Dortmund U. /Dresden, Tech. U. /Ecole Polytechnique /Edinburgh U. /INFN, Ferrara /Ferrara U. /INFN, Ferrara /INFN, Ferrara /Ferrara U. /INFN, Ferrara /Frascati /INFN, Genoa /Genoa U. /INFN, Genoa /INFN, Genoa /Genoa U. /INFN, Genoa /INFN, Genoa /Genoa U. /Indian Inst. Tech., Guwahati /Harvard U. /Heidelberg U. /Humboldt U., Berlin /Imperial Coll., London /Iowa State U. /Iowa State U. /Johns Hopkins U. /Orsay, LAL /LLNL, Livermore /Liverpool U. /Queen Mary, U. of London /Royal Holloway, U. of London /Louisville U. /Mainz U., Inst. Kernphys. /Manchester U. /Maryland U. /Massachusetts U., Amherst /MIT /McGill U. /INFN, Milan /Milan U. /INFN, Milan /INFN, Milan /Milan U. /Mississippi U. /Montreal U. /INFN, Naples /Naples U. /NIKHEF, Amsterdam /Notre Dame U. /Ohio State U. /Oregon U. /INFN, Padua /Padua U. /INFN, Padua /INFN, Padua /Padua U. /Paris U., VI-VII /INFN, Perugia /Perugia U. /INFN, Pisa /Pisa U. /INFN, Pisa /Pisa, Scuola Normale Superiore /INFN, Pisa /Pisa U. /INFN, Pisa /Princeton U. /INFN, Rome /INFN, Rome /Rome U. /INFN, Rome /INFN, Rome /Rome U. /INFN, Rome /INFN, Rome /Rome U. /INFN, Rome /INFN, Rome /Rome U. /Rostock U. /Rutherford /DAPNIA, Saclay /SLAC /South Carolina U. /Southern Methodist U. /Stanford U., Phys. Dept. /SUNY, Albany /Tel Aviv U. /Tennessee U. /Texas U. /Texas U., Dallas /INFN, Turin /Turin U. /INFN, Trieste /Trieste U. /Valencia U. /Victoria U. /Warwick U. /Wisconsin U., Madison

2011-08-11T23:59:59.000Z

84

Radioactive decay data tables  

SciTech Connect

The estimation of radiation dose to man from either external or internal exposure to radionuclides requires a knowledge of the energies and intensities of the atomic and nuclear radiations emitted during the radioactive decay process. The availability of evaluated decay data for the large number of radionuclides of interest is thus of fundamental importance for radiation dosimetry. This handbook contains a compilation of decay data for approximately 500 radionuclides. These data constitute an evaluated data file constructed for use in the radiological assessment activities of the Technology Assessments Section of the Health and Safety Research Division at Oak Ridge National Laboratory. The radionuclides selected for this handbook include those occurring naturally in the environment, those of potential importance in routine or accidental releases from the nuclear fuel cycle, those of current interest in nuclear medicine and fusion reactor technology, and some of those of interest to Committee 2 of the International Commission on Radiological Protection for the estimation of annual limits on intake via inhalation and ingestion for occupationally exposed individuals.

Kocher, D.C.

1981-01-01T23:59:59.000Z

85

Note on unparticle decays  

Science Conference Proceedings (OSTI)

The coupling of an unparticle operator O{sub U} to standard model particles opens up the possibility of unparticle decays into standard model fields. We study this issue by analyzing the pole structure (and spectral function) of the unparticle propagator, corrected to account for one-loop polarization effects from virtual standard model particles. We find that the propagator of a scalar unparticle (of scaling dimension 1{<=}d{sub U}<2) with a mass gap m{sub g} develops an isolated pole, m{sub p}{sup 2}-im{sub p}{gamma}{sub p}, with m{sub p}{sup 2} < or approx. m{sub g}{sup 2} below the unparticle continuum that extends above m{sub g} (showing that the theory would be unstable without a mass gap). If that pole lies below the threshold for decay into two standard model particles, it corresponds to a stable unparticle state (and its width {gamma}{sub p} is zero). For m{sub p}{sup 2} above the threshold, the width is nonzero and related to the rate of the unparticle decay into standard model particles. This picture is valid for any value of d{sub U} in the considered range.

Delgado, Antonio [Department of Physics, 225 Nieuwland Science Hall, University of Notre Dame, Notre Dame, Indiana 46556-5670 (United States); Espinosa, Jose R. [IFT-UAM/CSIC, Facultad Ciencias UAM, 28049 Madrid (Spain); IFAE, Universitat Autonoma de Barcelona, 08193 Bellaterra, Barcelona (Spain) and ICREA, Institucio Catalana de Recerca i Estudis Avancats, Barcelona (Spain); No, Jose Miguel [IFT-UAM/CSIC, Facultad Ciencias UAM, 28049 Madrid (Spain); Quiros, Mariano [IFAE, Universitat Autonoma de Barcelona, 08193 Bellaterra, Barcelona (Spain) and ICREA, Institucio Catalana de Recerca i Estudis Avancats, Barcelona (Spain); Theory Division, CERN, Geneva 23 CH-1211 (Switzerland)

2009-03-01T23:59:59.000Z

86

Spectroscopic studies beyond N = 152 neutron gap : decay of {sup 255 ovr sub 101}Md and {sup 256 ovr sub 101}Md.  

Science Conference Proceedings (OSTI)

The isotopes {sup 255}Md and {sup 256}Md were produced by the irradiation of {sup 253}Es with 35-45 MeV {alpha} particles by ({alpha},n) and ({alpha},2n) reactions and were removed from the target by a helium jet system. {alpha}, {gamma}, and {alpha}-{gamma} coincidence spectra were measured with Si and Ge(Li) detectors. From the EC decays of {sup 255}Md and {sup 256}Md, levels in {sup 255}Fm and {sup 256}Fm were deduced. Favored {alpha} decay of {sup 255}Md was found to populate the 7/2{sup -}[514] single-particle state in {sup 251}Es, thus establishing the 7/2{sup -}[514] as the {sup 255}Md ground state. Several {gamma} rays were observed in the {sub 256}Md {alpha}-{gamma} coincidence spectrum. {sup 256}Fm is the heaviest nucleus in which excited intrinsic states have been identified.

Ahmad, I.; Chasman, R. R.; Fields, P. R.

2000-01-01T23:59:59.000Z

87

Spectroscopic studies beyond the N=152 neutron gap: Decay of {sub 101}{sup 255}Md and {sub 101}{sup 256}Md  

Science Conference Proceedings (OSTI)

The isotopes {sup 255}Md and {sup 256}Md were produced by the irradiation of {sup 253}Es with 35-45 MeV {alpha} particles by ({alpha},n) and ({alpha},2n) reactions and were removed from the target by a helium jet system. {alpha}, {gamma}, and {alpha}-{gamma} coincidence spectra were measured with Si and Ge(Li) detectors. From the EC decays of {sup 255}Md and {sup 256}Md, levels in {sup 255}Fm and {sup 256}Fm were deduced. Favored {alpha} decay of {sup 255}Md was found to populate the 7/2{sup -}[514] single-particle state in {sup 251}Es, thus establishing the 7/2{sup -}[514] as the {sup 255}Md ground state. Several {gamma} rays were observed in the {sup 256}Md {alpha}-{gamma} coincidence spectrum. {sup 256}Fm is the heaviest nucleus in which excited intrinsic states have been identified. (c) 2000 The American Physical Society.

Ahmad, I. [Argonne National Laboratory, Argonne, Illinois 60439 (United States); Chasman, R. R. [Argonne National Laboratory, Argonne, Illinois 60439 (United States); Fields, P. R. [Argonne National Laboratory, Argonne, Illinois 60439 (United States)

2000-04-01T23:59:59.000Z

88

Alpha migration through air filters: A numerical simulation  

Science Conference Proceedings (OSTI)

This theoretical study investigates the migration of alpha-emitting particles through high-efficiency particulate air (HEPA) filters. As part of the study, a review of previous research relating to the alpha-migration phenomena was conducted. As a result of the literature review, a numerical model was developed to simulate the migration of alpha-emitting radionuclide aerosols through HEPA filters. This model predicts the filter performance with regard to particle penetration. It can be used to better estimate the penetration of alpha radioactive species through filter systems for environmental concerns, to aid in the use of current filter systems, and to design new filter systems. It is obvious from the review of the literature that evidence exists of migration of alpha radionuclide species through high-efficiency filter media. The theories suggest that nanometer-size particles can eventually penetrate fibrous filters because of gradual movement through the filter matrix. It is conjectured that this movement may be induced by energies caused by the alpha recoil from the decay process by thermal energies. It is further hypothesized that such nanometer-size particles, containing radionuclide species can be formed from larger particles already captured within the filter. The penetration of such small particles through high-efficiency filter media is so low that experimental corroboration of these mechanisms by penetration measurements is difficult at best. A number of items were identified that affect the migration of alpha-emitting particles through a filter. These include the size distribution of aerosol particles entering the filter, the size distribution of fragment particles produced by alpha recoil, the penetration of the challenge aerosols and fragment particles, the velocity through the filter, the radionuclide specific activity, the alpha recoil energy, and the surface-binding energies between the particle and the filter matrix.

Biermann, A.H.; da Roza, R.A.; Chang, Yun.

1991-12-11T23:59:59.000Z

89

E6 Gamma Decay  

SciTech Connect

Rare electric hexacontatetrapole (E6) transitions are studied in the full (f{sub 7/2},f{sub 5/2},p{sub 3/2},p{sub 1/2}) shell-model basis. Comparison of theory to the results from the gamma decay in {sup 53}Fe and from inelastic electron scattering on {sup 52}Cr provides unique and interesting tests of the valence wavefunctions, the models used for energy density functionals and into the origin of effective charge.

Brown, B. Alex [Department of Physics and Astronomy, and National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824-1321 (United States); Rae, W. D. M. [Knollhouse, Garsington, Oxford, Oxfordshire, OX44 9DB (United Kingdom)

2011-05-06T23:59:59.000Z

90

Rare B Decays  

SciTech Connect

Recent results from Belle and BaBar on rare B decays involving flavor-changing neutral currents or purely leptonic final states are presented. Measurements of the CP asymmetries in B {yields} K*{gamma} and b {yields} s{gamma} are reported. Also reported are updated limits on B{sup +} {yields} K{sup +}{nu}{bar {nu}}, B{sup +} {yields} {tau}{sup +}{nu}, B{sup +} {yields} {mu}{sup +}{nu} and the recent measurement of B {yields} X{sub s}{ell}{sup +}{ell}{sup -}.

Jackson, P.D.; /Victoria U.

2006-02-24T23:59:59.000Z

91

The luminescence characteristics of CsI(Na) crystal under {alpha} and X/{gamma} excitation  

SciTech Connect

In this paper, we study the effective decay time characteristic of CsI(Na) crystal under {sup 239}Pu alpha particle and {sup 137}Cs gamma-ray excitation using a single photon counting decay time measurement system. The measurement system employs a silicon optical fiber to couple and transit single photon. The slow decay time component of CsI(Na) crystal is 460-550 ns. We observe a 15 ns fast decay component under alpha particle excitation. In addition, we find that the primary stage of the falling edge in the decay time curve is non-exponential and drops rapidly when CsI(Na) crystal is excited by {sup 239}Pu alpha particles. Since the high density of self-trapped-excitons (STEs) is produced in alpha particle excitation process, we propose that the fast falling edge is corresponding to the quenching process of STEs which transit with non-radiation in the case of high excitation density. To prove this proposal, we excited the CsI(Na) crystal with sub-nanosecond intensive pulsed X-ray radiation. Our X-ray impinging results show that the fast falling edge also exists under low energy (average 100 keV) bremsstrahlung X-ray excitation.

Liu Jinliang [Department of Engineering Physics, Tsinghua University, Beijing 100084 (China); Radiation Detection Research Center, Northwest Institute of Nuclear Technology, Xi'an, Shaanxi 710024 (China); Liu Fang [Radiation Detection Research Center, Northwest Institute of Nuclear Technology, Xi'an, Shaanxi 710024 (China); School of Nuclear Science and Engineering, North China Electric Power University, Beijing 102206 (China); Ouyang Xiaoping [Department of Engineering Physics, Tsinghua University, Beijing 100084 (China); Radiation Detection Research Center, Northwest Institute of Nuclear Technology, Xi'an, Shaanxi 710024 (China); School of Nuclear Science and Engineering, North China Electric Power University, Beijing 102206 (China); Liu Bin [School of Nuclear Science and Engineering, North China Electric Power University, Beijing 102206 (China); Chen Liang; Ruan Jinlu; Zhang Zhongbing; Liu Jun [Radiation Detection Research Center, Northwest Institute of Nuclear Technology, Xi'an, Shaanxi 710024 (China)

2013-01-14T23:59:59.000Z

92

Diagnosing oscillatory growth or decay  

SciTech Connect

An analytical study is presented for an oscillatory system in terms of four constants, namely amplitude, phase, growth or decay rate, and frequency. (MOW)

Buneman, O.

1977-12-01T23:59:59.000Z

93

RETRIEVING SUSPECT TRANSURANIC (TRU) WASTE FROM THE HANFORD BURIAL GROUNDS PROGRESS PLANS & CHALLENGES  

SciTech Connect

This paper describes the scope and status of the program for retrieval of suspect transuranic (TRU) waste stored in the Hanford Site low-level burial grounds. Beginning in 1970 and continuing until the late 1980's, waste suspected of containing significant quantities of transuranic isotopes was placed in ''retrievable'' storage in designated modules in the Hanford burial grounds, with the intent that the waste would be retrieved when a national repository for disposal of such waste became operational. Approximately 15,000 cubic meters of waste, suspected of being TRU, was placed in storage modules in four burial grounds. With the availability of the national repository (the Waste Isolation Pilot Plant), retrieval of the suspect TRU waste is now underway. Retrieval efforts, to date, have been conducted in storage modules that contain waste, which is in general, contact-handled, relatively new (1980's and later), is stacked in neat, engineered configurations, and has a relatively good record of waste characteristics. Even with these optimum conditions, retrieval personnel have had to deal with a large number of structurally degraded containers, radioactive contamination issues, and industrial hazards (including organic vapors). Future retrieval efforts in older, less engineered modules are expected to present additional hazards and difficult challenges.

FRENCH, M.S.

2006-02-01T23:59:59.000Z

94

Long range alpha particle detector  

DOE Patents (OSTI)

An alpha particle detector capable of detecting alpha radiation from distant sources. A high voltage is generated near a conductive mesh while a fan draws air containing air molecules ionized by alpha particles across the mesh. The current in the mesh can be detected and used for measurement or alarm. The detector can be used for area, personnel and equipment monitoring.

Wolf, M.A.; McAdtee, J.L. III; Unruh, W.P.; Cucchiadra, A.L.; Huchton, R.L.

1990-03-13T23:59:59.000Z

95

Evidence of a new state in $^{11}$Be observed in the $^{11}$Li $?$-decay  

E-Print Network (OSTI)

Coincidences between charged particles emitted in the $\\beta$-decay of $^{11}$Li were observed using highly segmented detectors. The breakup channels involving three particles were studied in full kinematics allowing for the reconstruction of the excitation energy of the $^{11}$Be states participating in the decay. In particular, the contribution of a previously unobserved state at 16.3 MeV in $^{11}$Be has been identified selecting the $\\alpha$ + $^7$He$\\to\\alpha$ + $^6$He+n channel. The angular correlations between the $\\alpha$ particle and the center of mass of the $^6$He+n system favors spin and parity assignment of 3/2$^-$ for this state as well as for the previously known state at 18 MeV.

M. Madurga; M. J. G. Borge; M. Alcorta; L. M. Fraile; H. O. U. Fynbo; B. Jonsond; O. Kirsebom; G. Martinez-Pinedo; T. Nilsson; G. Nyman; A. Perea; A. Poves; K. Riisager; O. Tengblad; E. Tengborn; J. Van der Walle

2009-04-27T23:59:59.000Z

96

The Particle Adventure | Particle decays and annihiliations ...  

NLE Websites -- All DOE Office Websites (Extended Search)

Particle decays and annihiliations - Half life A lump of uranium left to itself will gradually decay, one nucleus at a time. The rate of decay is measured by how long it would take...

97

The Particle Adventure | Particle decays and annihiliations ...  

NLE Websites -- All DOE Office Websites (Extended Search)

virtual particles. Virtual particles do not violate the conservation of energy. The kinetic energy plus mass of the initial decaying particle and the final decay products is...

98

Beta-decay beyond the standard model  

Science Conference Proceedings (OSTI)

We discuss possible sources of new interactions in beta-decay and the role of beta-decay experiments in obtaining information on them. 46 refs.

Herczeg, P.

1989-01-01T23:59:59.000Z

99

Production and decay properties of the 1.9-s isomeric state in {sup 261}Rf  

SciTech Connect

The 1.9-s isomeric state ({sup 261}Rf{sup b}) in {sup 261}Rf was directly populated in the {sup 248}Cm({sup 18}O,5n){sup 261}Rf{sup b} reaction. Alpha and spontaneous fission (SF) decays of {sup 261}Rf{sup b}, as well as the 68-s state {sup 261}Rf{sup a}, was investigated with a rotating wheel apparatus under low background conditions attained by a gas-jet transport system coupled to the RIKEN gas-filled recoil ion separator. An identification of {sup 261}Rf{sup b} was based on {alpha}-{alpha} correlations linking {alpha} decays of {sup 261}Rf{sup b} and its daughter {sup 257}No. The {alpha}-particle energy of {sup 261}Rf{sup b} was measured to be 8.52 {+-} 0.05 MeV. The half-life was determined to be 1.9 {+-} 0.4 s based on both 8.52-MeV {alpha} and SF decays. The {alpha} and SF branches are 0.27 {+-} 0.06 and 0.73 {+-} 0.06, respectively. The cross section for the {sup 248}Cm({sup 18}O,5n){sup 261}Rf{sup b} reaction is {sigma}({sup 261}Rf{sup b}) = 11 {+-} 2 nb at 95.1 MeV, which gives a cross-section ratio of {sigma}({sup 261}Rf{sup a})/{sigma}({sup 261}Rf{sup b}) = 1.1 {+-} 0.2.

Haba, H.; Kaji, D.; Kikunaga, H.; Kudou, Y.; Morimoto, K.; Morita, K.; Ozeki, K.; Sumita, T.; Yoneda, A.; Kasamatsu, Y.; Komori, Y.; Ooe, K.; Shinohara, A. [Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama 351-0198 (Japan); Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043 (Japan)

2011-03-15T23:59:59.000Z

100

DESIGN AND PERFORMANCE OF A PASSIVE RADON DECAY PRODUCTS MONITOR  

E-Print Network (OSTI)

Electret-based passive air samplers have been used in United Kingdom and elsewhere for quantitative sampling for airborne dust. Alpha electret ion chambers (EIC) have been used for quantitative measurement of deposited alpha emitting isotopes. These two well documented principles are combined to create a passive radon progeny monitor. Large area (50 cm2) electret charged to 500 to 2000 volts collect airborne radon decay products and the collected sample is "viewed " and measured by an alpha EIC. Such collection and measurement continues for the entire period of sampling, providing an integrated signal to the electret in alpha EIC. The present work is of exploratory nature and provides the responses of three different sizes of collection electrets. Results are also compared with a simple passive device with no collecting electret. The study provides data for optimization of the design depending upon the requirement. Study is limited to a typical home with equilibrium ratios from 40 to 60%. This method can be used for both short term and long term monitoring of RDP in working level units.

F. Stieff

2006-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "alpha decay suspected" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

The decay of hot nuclei  

Science Conference Proceedings (OSTI)

The formation of hot compound nuclei in intermediate-energy heavy ion reactions is discussed. The statistical decay of such compound nuclei is responsible for the abundant emission of complex fragments and high energy gamma rays. 43 refs., 23 figs.

Moretto, L.G.; Wozniak, G.J.

1988-11-01T23:59:59.000Z

102

Overview of rare K decays  

Science Conference Proceedings (OSTI)

The status and future prospects of searches for and studies of forbidden and highly suppressed K decays are reviewed. Here the author discusses three areas of recent activity in rare K decay. These are lepton-flavor violating decays, which are entirely forbidden in the Standard Model, K{sub S} {yields} {pi}{sup +}{pi}{sup {minus}}{pi}{sup 0}, which is of interest from the point of view of CP-violation, and `one loop` decays of the form K{sup 0,{+-}} {yields} ({pi}{sup 0,{+-}})l{bar l}, that can throw light on Standard Model CP-violation and determine parameters such as V{sub td}.

Littenberg, L.

1995-05-01T23:59:59.000Z

103

Long range alpha particle detector  

DOE Patents (OSTI)

An alpha particle detector capable of detecting alpha radiation from distant sources. In one embodiment, a high voltage is generated in a first electrically conductive mesh while a fan draws air containing air molecules ionized by alpha particles through an air passage and across a second electrically conductive mesh. The current in the second electrically conductive mesh can be detected and used for measurement or alarm. The detector can be used for area, personnel and equipment monitoring.

MacArthur, Duncan W. (Los Alamos, NM); Wolf, Michael A. (Los Alamos, NM); McAtee, James L. (Los Alamos, NM); Unruh, Wesley P. (Los Alamos, NM); Cucchiara, Alfred L. (Los Alamos, NM); Huchton, Roger L. (Los Alamos, NM)

1993-01-01T23:59:59.000Z

104

Long range alpha particle detector  

DOE Patents (OSTI)

An alpha particle detector capable of detecting alpha radiation from distant sources. In one embodiment, a high voltage is generated in a first electrically conductive mesh while a fan draws air containing air molecules ionized by alpha particles through an air passage and across a second electrically conductive mesh. The current in the second electrically conductive mesh can be detected and used for measurement or alarm. The detector can be used for area, personnel and equipment monitoring.

MacArthur, D.W.; Wolf, M.A.; McAtee, J.L.; Unruh, W.P.; Cucchiara, A.L.; Huchton, R.L.

1993-02-02T23:59:59.000Z

105

The formation and decay of superheavy nuclei produced in $^{48}Ca$-induced reactions  

E-Print Network (OSTI)

The formation of superheavy nuclei in $^{48}Ca+^{232}Th$, $^{238}U$, $^{242,244}Pu$ and $^{248}Cm$ reactions and their subsequent decay are studied within the quantum mechanical fragmentation theory (QMFT) and the QMFT based preformed cluster-decay model (PCM) of Gupta and collaborators. According to QMFT, all these $^{48}Ca$-induced reactions are cold fusion reactions with relative excitation energies larger than for the $Pb$-induced cold fusion reactions and smaller than for the lighter beam i.e. $Mg$, $Si$ or $S$-induced hot fusion reactions. The same reactions were first suggested by Gupta et al. in 1977 on the basis of QMFT, and this study re-establishes the same result. In fact, for such heavy isotopes of Z=110 to 116, $^{50}Ca$ is shown to be a better beam for cold fusion, but $^{50}Ca$ is a radioactive nucleus. The $\\alpha$-decay half-lives of these nuclei after 3n and/ or 4n evaporations, i.e. of the evaporation residues of these compound systems, calculated on PCM compare reasonably well with experiments published by Dubna group and another recent calculation. As expected for such rare decays, PCM calculations show that the $\\alpha$-preformation factors are small, $\\sim 10^{-8}$ to $10^{-10}$. The possible competition of $\\alpha$-decays with heavy cluster emissions from these superheavy nuclei is also probed from the point of view of searching for new nuclear structure information and possible future experiments with such exotic nuclei. The decay half-lives for some clusters are in fact shown to be lower than the limits of experiments for nuclei with enough available atoms.

Sushil Kumar; M. Balasubramaniam; Raj K. Gupta; G. Munzenberg; W. Scheid

2011-11-08T23:59:59.000Z

106

A TRANSISTORIZED ALPHA COUNTER FOR AN ALPHA GAUGE  

SciTech Connect

A transistorized instrument prototype was designed and constructed to replace a vacuum-tube instrument in an alpha gauge, which measures the thickness density of gases. The instrument amplifies, shapes, discriminates, and counts alpha pulses from a Au-Si surface-barrier detector exposed to an alpha source in a gas-filled chamber. The circuit consists of a charge-sensitive preamplifier, a main amplifier with pulse clipping, a Schmitt trigger, a diode pump, and a count rate meter. Preliminary tests gave results comparable to the vacuum-tube instrument. Accuracy of counting was within 10% for 0.5- to 10-Mev alpha particles emitted at a maximum rate of 10/sup 6 per sec. The instrument was stable at 25 to 55 deg C, is small and portable, and costs less than 0. An infinitely thick, alpha source that will give a high count rate is being constructed for final tests. (auth)

Kopp, M.C.

1962-08-23T23:59:59.000Z

107

NONEQUILIBRIUM FLUCTUATIONS IN SHOCK COMPRESSION OF POLYCRYSTALLINE ALPHA-IRON  

Science Conference Proceedings (OSTI)

We report a numerical study of heterogeneous and nonequilibrium fluctuations in shock compression of {alpha}-iron at the grain level. A quasi-molecular code called DM2 is used to model the interactions of a plane shock wave with grain boundaries and crystal anisotropy over the pressure range of 5-45 GPa. Highly transient eddies that were reported earlier are again observed. We show new features through an elementary statistical analysis. They are (1) a characteristic decay constant for the non-equilibrium fluctuation on the order of 20ns, (2) a resonance phenomenon at an intermediate shock pressure, and (3) a more uniform shock structure for very high pressures.

Y. HORIE; K. YANO

2001-06-01T23:59:59.000Z

108

CRBRP decay heat removal systems  

SciTech Connect

The Decay Heat Removal Systems for the Clinch River Breeder Reactor Plant (CRBRP) are designed to adequately remove sensible and decay heat from the reactor following normal shutdown, operational occurrences, and postulated accidents on both a short term and a long term basis. The Decay Heat Removal Systems are composed of the Main Heat Transport System, the Main Condenser and Feedwater System, the Steam Generator Auxiliary Heat Removal System (SGAHRS), and the Direct Heat Removal Service (DHRS). The overall design of the CRBRP Decay Heat Removal Systems and the operation under normal and off-normal conditions is examined. The redundancies of the system design, such as the four decay heat removal paths, the emergency diesel power supplies, and the auxiliary feedwater pumps, and the diversities of the design such as forced circulation/natural circulation and AC Power/DC Power are presented. In addition to overall design and system capabilities, the detailed designs for the Protected Air Cooled Condensers (PACC) and the Air Blast Heat Exchangers (ABHX) are presented.

Hottel, R.E.; Louison, R.; Boardman, C.E.; Kiley, M.J.

1977-01-01T23:59:59.000Z

109

Suspect/Counterfeit Items Criteria Review and Approach Document (CRAD) NNSA/Nevada Site Office Facility Representative Division  

Energy.gov (U.S. Department of Energy (DOE))

Management should have a formal system under Quality Assurance with adequate controls defined and implemented to identify and preclude Suspect/Counterfeit Items (S/CI) from being introduced into...

110

Pulmonary uptake in Indium-111 leukocyte imaging: clinical significance in patients with suspected occult infections  

SciTech Connect

A retrospective review was undertaken to evaluate the frequency and significance of pulmonary activity noted on 306 indium-111 leukocyte studies involving 232 patients with suspected occult infections. Forty-eight studies showed pulmonary activity in one of two patterns of uptake, focal or diffuse. Fourteen of 27 studies (52%) with focal uptake and two of 21 studies (10%) with diffuse uptake were associated with infectious processes. Lung uptake of indium-111-labeled leukocytes was a poor predictor of pulmonary infection in patients studied for occult infection, although the focal pattern was more likely than the diffuse pattern to be associated with infection.

Cook, P.S.; Datz, F.L.; Disbro, M.A.; Alazraki, N.P.; Taylor, A.T.

1984-02-01T23:59:59.000Z

111

Atomic nuclei decay modes by spontaneous emission of heavy ions  

Science Conference Proceedings (OSTI)

The great majority of the known nuclides with Z>40, including the so-called stable nuclides, are metastable with respect to several modes of spontaneous superasymmetric splitting. A model extended from the fission theory of alpha decay allows one to estimate the lifetimes and the branching ratios relative to the alpha decay for these natural radioactivities. From a huge amount of systematic calculations it is concluded that the process should proceed with maximum intensity in the trans-lead nuclei, where the minimum lifetime is obtained from parent-emitted heavy ion combinations leading to a magic (/sup 208/Pb) or almost magic daughter nucleus. More than 140 nuclides with atomic number smaller than 25 are possible candidates to be emitted from heavy nuclei, with half-lives in the range of 10/sup 10/--10/sup 30/ s: /sup 5/He, /sup 8en-dash10/Be, /sup 11,12/B, /sup 12en-dash16/C, /sup 13en-dash17/N, /sup 15en-dash22/O, /sup 18en-dash23/F, /sup 20en-dash26/Ne, /sup 23en-dash28/Na, /sup 23en-dash30/Mg, /sup 27en-dash32/Al, /sup 28en-dash36/Si, /sup 31en-dash39/P, /sup 32en-dash42/S, /sup 35en-dash45/Cl, /sup 37en-dash47/Ar, /sup 40en-dash49/ K, . .Ca, /sup 44en-dash53/ Sc, /sup 46en-dash53/Ti, /sup 48en-dash54/V, and /sup 49en-dash55/ Cr. The shell structure and the pairing effects are clearly manifested in these new decay modes.

Poenaru, D.N.; Ivascu, M.; Sndulescu, A.; Greiner, W.

1985-08-01T23:59:59.000Z

112

Selected Aspects of Neutron Decay  

E-Print Network (OSTI)

Precision measurements of neutron decay offer complementary access to particle physics at small distance scales or high energies. In particular they allow tests of the V-A structure of the weak interaction. Among many experimental activities which are ongoing around the world we present two new experiments which are planned or studied for the near future. While the neutron lifetime still bears significant experimental uncertainties and thus has to be studied with greatest precision the two-body decay ($n\\to H\\bar\

Stephan Paul

2005-04-18T23:59:59.000Z

113

CDF results on B decays  

SciTech Connect

The authors present recent CDF results on B lifetimes, B meson mass measurements, ratios of branching ratios, and rare decays. In addition, they present the first measurement of time-dependent B{sub d} mixing at CDF. Several results have been updated and a few new ones included since the workshop.

Skarha, J.E. [Johns Hopkins Univ., Baltimore, MD (United States)

1995-05-01T23:59:59.000Z

114

Rare B decays at CDF  

SciTech Connect

The confidence level limits of the CDF search for the B{sub s}{sup 0} and B{sub d}{sup 0} {yields} {mu}{sup +}{mu}{sup -} rare decays and the branching ratio measurement of B{sub s}{sup 0} {yields} D{sub s}{sup +} D{sub s}{sup -} are presented.

Farrington, Sinead M.; /Liverpool U.

2006-10-01T23:59:59.000Z

115

Neutron Beta Decay Studies with Nab  

E-Print Network (OSTI)

Precision measurements in neutron beta decay serve to determine the coupling constants of beta decay and allow for several stringent tests of the standard model. This paper discusses the design and the expected performance of the Nab spectrometer.

Baeler, S; Alonzi, L P; Balascuta, S; Barrn-Palos, L; Bowman, J D; Bychkov, M A; Byrne, J; Calarco, J R; Chupp, T; Vianciolo, T V; Crawford, C; Frle, E; Gericke, M T; Glck, F; Greene, G L; Grzywacz, R K; Gudkov, V; Harrison, D; Hersman, F W; Ito, T; Makela, M; Martin, J; McGaughey, P L; McGovern, S; Page, S; Penttil, S I; Po?ani?, D; Rykaczewski, K P; Salas-Bacci, A; Tompkins, Z; Wagner, D; Wilburn, W S; Young, A R

2012-01-01T23:59:59.000Z

116

Neutron Beta Decay Studies with Nab  

E-Print Network (OSTI)

Precision measurements in neutron beta decay serve to determine the coupling constants of beta decay and allow for several stringent tests of the standard model. This paper discusses the design and the expected performance of the Nab spectrometer.

S. Baeler; R. Alarcon; L. P. Alonzi; S. Balascuta; L. Barrn-Palos; J. D. Bowman; M. A. Bychkov; J. Byrne; J. R. Calarco; T. Chupp; T. V. Vianciolo; C. Crawford; E. Frle; M. T. Gericke; F. Glck; G. L. Greene; R. K. Grzywacz; V. Gudkov; D. Harrison; F. W. Hersman; T. Ito; M. Makela; J. Martin; P. L. McGaughey; S. McGovern; S. Page; S. I. Penttil; D. Po?ani?; K. P. Rykaczewski; A. Salas-Bacci; Z. Tompkins; D. Wagner; W. S. Wilburn; A. R. Young

2012-09-20T23:59:59.000Z

117

Proton Recoil Energy and Angular Distribution of Neutron Radiative Beta Decay  

E-Print Network (OSTI)

We analyse the proton recoil energy and angular distribution of the radiative beta-decay of the neutron to leading order in the large baryon mass expansion by taking into account the contributions of the proton-photon correlations. We show that the account for the proton-photon correlations does not contradict the description of the radiative corrections to the lifetime of the neutron and the proton recoil energy spectrum of the neutron beta-decay in terms of the functions (\\alpha/\\pi) g_n(E_e) and (\\alpha/\\pi) f_n(E_e), where E_e is the electron energy. In addition we find that the contributions of the proton-photon correlations in the radiative beta-decay of the neutron to the proton recoil asymmetry C are of order 10^(-4). They make the contributions of the radiative corrections to the proton recoil asymmetry C symmetric with respect to a change A_0 B_0, where A_0 and B_0 are the correlation coefficients of the neutron beta-decay.

A. N. Ivanov; R. Hollwieser; N. I. Troitskaya; M. Wellenzohn

2013-06-19T23:59:59.000Z

118

Probing Radiative Solar Neutrinos Decays  

E-Print Network (OSTI)

Motivated by a pilot experiment conducted by F.Vannucci et al. during a solar eclipse, we work out the geometry governing the radiative decays of solar neutrinos. Surprisingly, although a smaller proportion of the photons can be detected, the case of strongly non-degenerate neutrinos brings better limits in terms of the fundamental couplings. We advocate satellite-based experiments to improve the sensitivity.

Frre, J M

1998-01-01T23:59:59.000Z

119

The Particle Adventure | Particle decays and annihiliations ...  

NLE Websites -- All DOE Office Websites (Extended Search)

alphabet: (alpha), (beta), and (gamma). Alpha particles are helium nuclei (2 p, 2 n): Beta particles are speedy electrons: Gamma radiation is a high-energy photon: These three...

120

NIST: Marie Curie and the NBS Radium Standards - Decay ...  

Science Conference Proceedings (OSTI)

... Decay schemes from uranium, actinium and thorium series Decay schemes from uranium, actinium and thorium series as given in Frederick ...

2010-10-05T23:59:59.000Z

Note: This page contains sample records for the topic "alpha decay suspected" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

Recent developments in radiative B decays  

E-Print Network (OSTI)

We report on recent theoretical progress in radiative B decays. We focus on a calculation of logarithmically enhanced QED corrections to the branching ratio and forward-backward asymmetry in the inclusive rare decay anti-B --> X(s) l+ l-, and present the results of a detailed phenomenological analysis. We also report on the calculation of NNLO QCD corrections to the inclusive decay anti-B --> X(s) gamma. As far as exclusive modes are concerned we consider transversity amplitudes and the impact of right-handed currents in the exclusive anti-B --> K^* l+ l- decay. Finally, we state results for exclusive B --> V gamma decays, notably the time-dependent CP-asymmetry in the exclusive B --> K^* gamma decay and its potential to serve as a so-called ``null test'' of the Standard Model, and the extraction of CKM and unitarity triangle parameters from B --> (rho,omega) gamma and B --> K^* gamma decays.

Huber, T

2008-01-01T23:59:59.000Z

122

Detecting special nuclear materials in suspect containers using high-energy gamma rays emitted by fission products  

DOE Patents (OSTI)

A method and a system for detecting the presence of special nuclear materials in a suspect container. The system and its method include irradiating the suspect container with a beam of neutrons, so as to induce a thermal fission in a portion of the special nuclear materials, detecting the gamma rays that are emitted from the fission products formed by the thermal fission, to produce a detector signal, comparing the detector signal with a threshold value to form a comparison, and detecting the presence of the special nuclear materials using the comparison.

Norman, Eric B. (Oakland, CA); Prussin, Stanley G. (Kensington, CA)

2009-01-06T23:59:59.000Z

123

Detecting special nuclear materials in suspect containers using high-energy gamma rays emitted by fission products  

DOE Patents (OSTI)

A method and a system for detecting the presence of special nuclear materials in a suspect container. The system and its method include irradiating the suspect container with a beam of neutrons, so as to induce a thermal fission in a portion of the special nuclear materials, detecting the gamma rays that are emitted from the fission products formed by the thermal fission, to produce a detector signal, comparing the detector signal with a threshold value to form a comparison, and detecting the presence of the special nuclear materials using the comparison.

Norman, Eric B. (Oakland, CA); Prussin, Stanley G. (Kensington, CA)

2009-01-27T23:59:59.000Z

124

Detecting special nuclear materials in suspect containers using high-energy gamma rays emitted by fission products  

DOE Patents (OSTI)

A method and a system for detecting the presence of special nuclear materials in a suspect container. The system and its method include irradiating the suspect container with a beam of neutrons, so as to induce a thermal fission in a portion of the special nuclear materials, detecting the gamma rays that are emitted from the fission products formed by the thermal fission, to produce a detector signal, comparing the detector signal with a threshold value to form a comparison, and detecting the presence of the special nuclear materials using the comparison.

Norman, Eric B [Oakland, CA; Prussin, Stanley G [Kensington, CA

2009-05-05T23:59:59.000Z

125

Bioprospecting metagenomics of decaying wood: mining for new glycoside hydrolases  

DOE Green Energy (OSTI)

To efficiently deconstruct recalcitrant plant biomass to fermentable sugars in industrial processes, biocatalysts of higher performance and lower cost are required. The genetic diversity found in the metagenomes of natural microbial biomass decay communities may harbor such enzymes. Our goal was to discover and characterize new glycoside hydrolases (GHases) from microbial biomass decay communities, especially those from unknown or never previously cultivated microorganisms. From the metagenome sequences of an anaerobic microbial community actively decaying poplar biomass, we identified approximately 4,000 GHase homologs. Based on homology to GHase families/activities of interest and the quality of the sequences, candidates were selected for full-length cloning and subsequent expression. As an alternative strategy, a metagenome expression library was constructed and screened for GHase activities. These combined efforts resulted in the cloning of four novel GHases that could be successfully expressed in Escherichia coli. Further characterization showed that two enzymes showed significant activity on p-nitrophenyl-{alpha}-L-arabinofuranoside, one enzyme had significant activity against p-nitrophenyl-{beta}-D-glucopyranoside, and one enzyme showed significant activity against p-nitrophenyl-{beta}-D-xylopyranoside. Enzymes were also tested in the presence of ionic liquids. Metagenomics provides a good resource for mining novel biomass degrading enzymes and for screening of cellulolytic enzyme activities. The four GHases that were cloned may have potential application for deconstruction of biomass pretreated with ionic liquids, as they remain active in the presence of up to 20% ionic liquid (except for 1-ethyl-3-methylimidazolium diethyl phosphate). Alternatively, ionic liquids might be used to immobilize or stabilize these enzymes for minimal solvent processing of biomass.

Li L. L.; van der Lelie D.; Taghavi, S.; McCorkle, S. M.; Zhang, Y.-B.; Blewitt, M. G.; Brunecky, R.; Adney, W. S.; Himmel, M. E.; Brumm, P.; Drinkwater, C.; Mead, D. A.; Tringe, S. G.

2011-08-01T23:59:59.000Z

126

Profile-based adaptation for cache decay  

E-Print Network (OSTI)

Cache decay is a leakage-reduction mechanism that puts cache lines that have not been accessed for a specific duration into a lowleakage standby mode. This duration is called the decay interval, and its optimal value varies across applications. This paper describes an adaptation technique that analytically finds the optimal decay interval through profiling, and shows that the most important variables required for finding the optimal decay interval can be estimated using profiling with a reasonable degree of accuracy. Unlike previous methods that attempt to put only dead lines into standby mode, this work explicitly trades off the leakage power saved in putting live lines into standby against its performance and energy costs. It also combines traditional DVS with cache decay using an analysis and obtains results close to what can be obtained with an omniscient choice of per-benchmark optimal decay interval. 1

Karthik Sankaranarayanan

2004-01-01T23:59:59.000Z

127

New Nuclear And Subnuclear Exotic Decays  

E-Print Network (OSTI)

In this paper new nuclear and subnuclear exotic decays are investigated. Some theoretical problems of the pionic radioactivity, such as fission-like models, applicable to all kind of exotic nuclear and subnuclear decays are presented. The induced nuclear and subnuclear decays are discussed. Moreover, using the recent results on the spontaneous fission half lives T of the heavy nuclei with Z new predictions on the pionic yields in the region of superheavy elements are presented.

D. B. Ion; Reveica Ion-Mihai; M. L. Ion

2007-10-03T23:59:59.000Z

128

R Parity Violating Decays of the Gluino  

E-Print Network (OSTI)

Assuming the lightest supersymmetric particle is the gluino, we treat the decays gluino->quark-antiquark-neutrino and gluino->gluon-neutrino. Such couplings can be induced by the R parity violating quark-squark-lepton interaction which can also be responsible for neutrino masses and mixings. These R parity violating gluino decays have the same final state structure (jets plus missing energy) as previously considered decays into quark-antiquark-photino and gluon-gravitino but with significantly different gluino lifetimes.

L. Clavelli; H. Stremnitzer

2003-08-27T23:59:59.000Z

129

Micromegas readouts for double beta decay searches  

E-Print Network (OSTI)

Double beta $\\beta\\beta$ decay experiments are one of the most active research topics in Neutrino Physics. The measurement of the neutrinoless mode $0\

Cebrin, S; Ferrer-Ribas, E; Galn, J; Garca, J A; Giomataris, I; Gmez, H; Herrera, D C; Iguaz, F J; Irastorza, I G; Luzn, G; Rodrguez, A; Segu, L; Toms, A

2010-01-01T23:59:59.000Z

130

Micromegas readouts for double beta decay searches  

E-Print Network (OSTI)

Double beta $\\beta\\beta$ decay experiments are one of the most active research topics in Neutrino Physics. The measurement of the neutrinoless mode $0\

S. Cebrin; T. Dafni; E. Ferrer-Ribas; J. Galn; J. A. Garca; I. Giomataris; H. Gmez; D. C. Herrera; F. J. Iguaz; I. G. Irastorza; G. Luzn; A. Rodrguez; L. Segu; A. Toms

2010-09-09T23:59:59.000Z

131

The Particle Adventure | Particle decays and annihiliations ...  

NLE Websites -- All DOE Office Websites (Extended Search)

Particle decays and annihiliations - Electron positron annhiliation When an electron and positron (antielectron) collide at high energy, they can annihilate to produce charm...

132

Nuclear beta-decay measurements and |Vud|  

E-Print Network (OSTI)

Some recent work in nuclear beta decay related to the value of |Vud| is described along with some near-term goals for future measurements.

Dan Melconian

2011-08-11T23:59:59.000Z

133

Nuclear beta-decay measurements and |Vud|  

E-Print Network (OSTI)

Some recent work in nuclear beta decay related to the value of |Vud| is described along with some near-term goals for future measurements.

Melconian, Dan

2011-01-01T23:59:59.000Z

134

Spectroscopy of element 115 decay chains  

Science Conference Proceedings (OSTI)

A high-resolution a, X-ray and -ray coincidence spectroscopy experiment was conducted at the GSI Helmholtzzentrum fu r Schwerionenforschung. Thirty correlated a-decay chains were detected following the fusion-evaporation reaction 48Ca + 243Am. The observations are consistent with previous assignments of similar decay chains to originate from element Z = 115. The data includes first candidates of fingerprinting the decay step Mt --> Bh with characteristic X rays. For the first time, precise spectroscopy allows the derivation of excitation schemes of isotopes along the decay chains starting with elements Z > 112. Comprehensive Monte-Carlo simulations accompany the data analysis. Nuclear structure models provide a first level interpretation.

Rudolph, Dirk [Lund University, Sweden; Forsberg, U. [Lund University, Sweden; Golubev, P. [Lund University, Sweden; Sarmiento, L. G. [Lund University, Sweden; Yakushev, A. [Gesellschaft fur Schwerionenforschung (GSI), Germany; Andersson, L.-L. [Johannes Gutenberg-Universitaet Mainz, Mainz, Germany; Di Nitto, A. [Johannes Gutenberg-Universitaet Mainz, Mainz, Germany; Duehllmann, Ch. E. [Gesellschaft fur Schwerionenforschung (GSI), Germany; Gates, J. M. [Lawrence Berkeley National Laboratory (LBNL); Gregorich, K. E. [Lawrence Berkeley National Laboratory (LBNL); Gross, Carl J [ORNL; Hessberger, F. P. [Gesellschaft fur Schwerionenforschung (GSI), Germany; Herzberg, R.-D [University of Liverpool; Khuyagbaatar, J. [Johannes Gutenberg-Universitaet Mainz, Mainz, Germany; Kratz, J. V. [Johannes Gutenberg-Universitaet Mainz, Mainz, Germany; Rykaczewski, Krzysztof Piotr [ORNL; Schaedel, M. [Gesellschaft fur Schwerionenforschung (GSI), Germany; Aberg, S. [Lund University, Sweden; Ackermann, D. [GSI-Hemholtzzentrum fur Schwerionenforschung, Darmstadt, Germany; Block, M. [Gesellschaft fur Schwerionenforschung (GSI), Germany; Brand, H. [Gesellschaft fur Schwerionenforschung (GSI), Germany; Carlsson, B. G. [Lund University, Sweden; Cox, D. [University of Liverpool; Derkx, X. [Johannes Gutenberg-Universitaet Mainz, Mainz, Germany; Eberhardt, K. [Johannes Gutenberg-Universitaet Mainz, Mainz, Germany; Even, J. [Johannes Gutenberg-Universitaet Mainz, Mainz, Germany; Fahlander, C. [Lund University, Sweden; Gerl, J. [Gesellschaft fur Schwerionenforschung (GSI), Germany; Jaeger, E. [Gesellschaft fur Schwerionenforschung (GSI), Germany; Kindler, B. [Gesellschaft fur Schwerionenforschung (GSI), Germany; Krier, J. [Gesellschaft fur Schwerionenforschung (GSI), Germany; Kojouharov, I. [Gesellschaft fur Schwerionenforschung (GSI), Germany; Kurz, N. [Gesellschaft fur Schwerionenforschung (GSI), Germany; Lommel, B. [Gesellschaft fur Schwerionenforschung (GSI), Germany; Mistry, A. [University of Liverpool; Mokry, C. [Johannes Gutenberg-Universitaet Mainz, Mainz, Germany; Nitsche, H. [Lawrence Berkeley National Laboratory (LBNL); Omtvedt, J. P. [Paul Scherrer Institut, Villigen, Switzerland; Papadakis, P. [University of Liverpool; Ragnarsson, I. [Lund University, Sweden; Runke, J. [Gesellschaft fur Schwerionenforschung (GSI), Germany; Schaffner, H. [Gesellschaft fur Schwerionenforschung (GSI), Germany; Schausten, B. [Gesellschaft fur Schwerionenforschung (GSI), Germany; Thoerle-Pospiech, P. [Johannes Gutenberg-Universitaet Mainz, Mainz, Germany; Torres, T. [Gesellschaft fur Schwerionenforschung (GSI), Germany; Traut, T. [Johannes Gutenberg-Universitaet Mainz, Mainz, Germany; Trautmann, N. [Johannes Gutenberg-Universitaet Mainz, Mainz, Germany; Tuerler, A. [Paul Scherrer Institut, Villigen, Switzerland; Ward, A. [University of Liverpool; Ward, D. E. [Lund University, Sweden; Wiehl, N. [Johannes Gutenberg-Universitaet Mainz, Mainz, Germany

2013-01-01T23:59:59.000Z

135

A synopsis of collective alpha effects and implications for ITER  

SciTech Connect

This paper discusses the following: Alpha Interaction with Toroidal Alfven Eigenmodes; Alpha Interaction with Ballooning Modes; Alpha Interaction with Fishbone Oscillations; and Implications for ITER.

Sigmar, D.J.

1990-10-01T23:59:59.000Z

136

Extension of Alpha- and Beta-Decay Systematics of Protactinium Isotopes  

E-Print Network (OSTI)

Hanford Operations Office Idaho Operations Office Iowa State College Knolls Atomic Power Laboratory Los Alamos Mallinckrodt Chemical Works;

Meinke, W. Wayne; Seaborg, Glenn T.

2008-01-01T23:59:59.000Z

137

COUPLED CHANNEL ALPHA DECAY THEORY FOR EVEN- AND ODD-MASS LIGHT AND HEAVY NUCLEI  

E-Print Network (OSTI)

which the transition matrix has energy-dependent resonanceparts of the energy-dependent S-matrix elements are plottedcoupling matrix elements, the rotational energy and the

Rauscher, E.A.

2011-01-01T23:59:59.000Z

138

Spectral properties of the nonspherically decaying radiation generated by a rotating superluminal source  

E-Print Network (OSTI)

The focusing of the radiation generated by a polarization current with a superluminally rotating distribution pattern is of a higher order in the plane of rotation than in other directions. Consequently, our previously published asymptotic approximation to the value of this field outside the equatorial plane breaks down as the line of sight approaches a direction normal to the rotation axis, i.e., is nonuniform with respect to the polar angle. Here we employ an alternative asymptotic expansion to show that, though having a rate of decay with frequency (mu) that is by a factor of order mu^(2/3) slower, the equatorial radiation field has the same dependence on distance as the nonspherically decaying component of the generated field in other directions: it, too, diminishes as the inverse square root of the distance from its source. We also briefly discuss the relevance of these results to the giant pulses received from pulsars: the focused, nonspherically decaying pulses that arise from a superluminal polarization current in a highly magnetized plasma have a power-law spectrum (i.e., a flux density proportional to mu^alpha) whose index (alpha) is given by one of the values -2/3, -2, -8/3, or -4.

Houshang Ardavan; Arzhang Ardavan; John Singleton; Joseph Fasel; Andrea Schmidt

2007-10-17T23:59:59.000Z

139

Refinement of the $n-\\alpha$ and $p-\\alpha$ fish-bone potential  

E-Print Network (OSTI)

The fishbone potential of composite particles simulates the Pauli effect by nonlocal terms. We determine the $n-\\alpha$ and $p-\\alpha$ fish-bone potential by simultaneously fitting to the experimental phase shifts. We found that with a double Gaussian parametrization of the local potential can describe the $n-\\alpha$ and $p-\\alpha$ phase shifts for all partial waves.

Smith, E; Papp, Z

2012-01-01T23:59:59.000Z

140

Beta decays with momentum space Majorana spinors  

E-Print Network (OSTI)

We construct and apply to beta decays a truly neutral local quantum field that is entirely based upon momentum space Majorana spinors. We make the observation that theory with momentum space Majorana spinors of real C parities is equivalent to Dirac's theory. For imaginary C parities, the neutrino mass can drop from the single beta decay trace and reappear in 0\

M. Kirchbach; C. Compean; L. Noriega

2004-11-24T23:59:59.000Z

Note: This page contains sample records for the topic "alpha decay suspected" from the National Library of EnergyBeta (NLEBeta).
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to obtain the most current and comprehensive results.


141

Alpha Channeling in a Rotating Plasma  

E-Print Network (OSTI)

The wave-particle alpha-channeling effect is generalized to include rotating plasma. Specifically, radio frequency waves can resonate with alpha particles in a mirror machine with ExB rotation to diffuse the alpha particles along constrained paths in phase space. Of major interest is that the alpha-particle energy, in addition to amplifying the RF waves, can directly enhance the rotation energy which in turn provides additional plasma confinement in centrifugal fusion reactors. An ancillary benefit is the rapid removal of alpha particles, which increases the fusion reactivity.

Fetterman, Abraham J

2008-01-01T23:59:59.000Z

142

Variations of decay rates of radio-active elements and their connections with global anisotropy of physical space  

E-Print Network (OSTI)

The analysis of correlations between fluctuations of alpha- and beta-decay rates for different radio-active elements is carried out. These fluctuations exceed significantly errors of measurements in many cases. They have the periodical character and reveal definite spatial directions. We suggest that the observed fluctuations are caused by the unique physical reason connected with the global anisotropy of physical space and by the new force.

Yu. A. Baurov; I. F. Malov

2010-01-29T23:59:59.000Z

143

Special Rreview of the Suspect/Counterfeit Items Program at the Bechtel Jacobs Company, LLC at the Oak Ridge Reservation  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Special Review of the Special Review of the Suspect/Counterfeit Items Program at the Bechtel Jacobs Company, LLC at the Oak Ridge Reservation May 2011 July 2011 Office of Enforcement and Oversight Office of Health, Safety and Security U.S. Department of Energy i Table of Contents 1.0 Purpose and Scope ............................................................................................................................... 1 2.0 Results ................................................................................................................................................... 1 3.0 Conclusions ........................................................................................................................................... 5

144

Special Rreview of the Suspect/Counterfeit Items Program at the Bechtel Jacobs Company, LLC at the Oak Ridge Reservation  

NLE Websites -- All DOE Office Websites (Extended Search)

Special Review of the Special Review of the Suspect/Counterfeit Items Program at the Bechtel Jacobs Company, LLC at the Oak Ridge Reservation May 2011 July 2011 Office of Enforcement and Oversight Office of Health, Safety and Security U.S. Department of Energy i Table of Contents 1.0 Purpose and Scope ............................................................................................................................... 1 2.0 Results ................................................................................................................................................... 1 3.0 Conclusions ........................................................................................................................................... 5

145

Search for the second forbidden {beta} decay of {sup 8}B to the ground state of {sup 8}Be  

Science Conference Proceedings (OSTI)

A significant decay branch of {sup 8}B to the ground state of {sup 8}Be would extend the solar neutrino spectrum to higher energies than anticipated in the standard solar models. These high-energy neutrinos would affect current neutrino oscillation results and also would be a background to measurements of the hep process. We have measured the delayed {alpha} particles from the decay of {sup 8}B, with the goal of observing the two 46-keV {alpha} particles arising from the ground-state decay. The {sup 8}B was produced using an in-flight radioactive beam technique. It was implanted in a silicon PIN-diode detector that was capable of identifying the {alpha} particles from the {sup 8}Be ground state. From this measurement we find an upper limit (at 90% confidence level) of 7.3x10{sup -5} for the branching ratio to the ground state. In addition to describing this measurement, we present a theoretical calculation for this branching ratio.

Bacrania, M. K.; Boyd, N. M.; Robertson, R. G. H.; Storm, D. W. [Center for Experimental Nuclear Physics and Astrophysics, Physics Department, University of Washington, Seattle, Washington 98195 (United States)

2007-11-15T23:59:59.000Z

146

Search for the second forbidden beta decay of 8B to the ground state of 8Be  

E-Print Network (OSTI)

A significant decay branch of 8B to the ground state of 8Be would extend the solar neutrino spectrum to higher energies than anticipated in the standard solar models. These high-energy neutrinos would affect current neutrino oscillation results and also would be a background to measurements of the hep process. We have measured the delayed alpha particles from the decay of 8B, with the goal of observing the two 46-keV alpha particles arising from the ground-state decay. The 8B was produced using an in-flight radioactive beam technique. It was implanted in a silicon PIN-diode detector that was capable of identifying the alpha-particles from the 8Be ground state. From this measurement we find an upper limit (at 90% confidence level) of 7.3 x 10^{-5} for the branching ratio to the ground state. In addition to describing this measurement, we present a theoretical calculation for this branching ratio.

M. K. Bacrania; N. M. Boyd; R. G. H. Robertson; D. W. Storm

2007-10-28T23:59:59.000Z

147

Search for the second forbidden beta decay of 8B to the ground state of 8Be  

E-Print Network (OSTI)

A significant decay branch of 8B to the ground state of 8Be would extend the solar neutrino spectrum to higher energies than anticipated in the standard solar models. These high-energy neutrinos would affect current neutrino oscillation results and also would be a background to measurements of the hep process. We have measured the delayed alpha particles from the decay of 8B, with the goal of observing the two 46-keV alpha particles arising from the ground-state decay. The 8B was produced using an in-flight radioactive beam technique. It was implanted in a silicon PIN-diode detector that was capable of identifying the alpha-particles from the 8Be ground state. From this measurement we find an upper limit (at 90% confidence level) of 7.3 x 10^{-5} for the branching ratio to the ground state. In addition to describing this measurement, we present a theoretical calculation for this branching ratio.

Bacrania, M K; Robertson, R G H; Storm, D W

2007-01-01T23:59:59.000Z

148

The decay rate of ocean swell observed by altimeter  

Science Conference Proceedings (OSTI)

Altimeter data from transects across the Southern Ocean is analysed to determine the decay of oceanic swell. The resulting decay rate is shown to be proportional to wave number squared and swell amplitude cubed. Such a decay relationship is ...

I. R. Young; A. V. Babanin; S. Zieger

149

B, D and K Decays  

SciTech Connect

The present report documents the results of Working Group 2: B, D and K decays, of the workshop on Flavor in the Era of the LHC, held at CERN from November 2005 through March 2007. With the advent of the LHC, we will be able to probe New Physics (NP) up to energy scales almost one order of magnitude larger than it has been possible with present accelerator facilities. While direct detection of new particles will be the main avenue to establish the presence of NP at the LHC, indirect searches will provide precious complementary information, since most probably it will not be possible to measure the full spectrum of new particles and their couplings through direct production. In particular, precision measurements and computations in the realm of flavor physics are expected to play a key role in constraining the unknown parameters of the Lagrangian of any NP model emerging from direct searches at the LHC. The aim of Working Group 2 was twofold: on one hand, to provide a coherent, up-to-date picture of the status of flavor physics before the start of the LHC; on the other hand, to initiate activities on the path towards integrating information on NP from high-p{sub T} and flavor data. This report is organized as follows. In Sec. 1, we give an overview of NP models, focusing on a few examples that have been discussed in some detail during the workshop, with a short description of the available computational tools for flavor observables in NP models. Sec. 2 contains a concise discussion of the main theoretical problem in flavor physics: the evaluation of the relevant hadronic matrix elements for weak decays. Sec. 3 contains a detailed discussion of NP effects in a set of flavor observables that we identified as 'benchmark channels' for NP searches. The experimental prospects for flavor physics at future facilities are discussed in Sec. 4. Finally, Sec. 5 contains some assessments on the work done at the workshop and the prospects for future developments.

Artuso, M.; Asner, D.M.; Ball, P.; Baracchini, E.; Bell, G.; Beneke, M.; Berryhill, J.; Bevan, A.; Bigi, I.I.; Blanke, M.; Bobeth, Ch.; Bona, M.; Borzumati, F.; Browder, T.; Buanes, T.; Buchalla, G.; Buchmuller, O.; Buras, A.J.; Burdin, S.; Cassel, D.G.; Cavanaugh, R.; /Syracuse U. /Carleton U. /Durham U., IPPP /Rome U. /INFN, Rome /Karlsruhe U. /RWTH Aachen U. /Fermilab /Queen Mary, U. of London /Notre Dame U. /Munich, Tech. U. /Munich, Max Planck Inst. /Dortmund U. /Annecy, LAPP /ICTP, Trieste /Taiwan, Natl. Central U. /Hawaii U. /Bergen U. /Munich U. /CERN /Liverpool U.

2008-03-07T23:59:59.000Z

150

Angular and Isospin Asymmetries in the Decays B->K(*)l l-  

SciTech Connect

We use a sample of 384 million B{bar B} decays collected with the BABAR detector at the PEP-II asymmetric e{sup +}e{sup -} storage ring to study the flavor-changing neutral current decays B {yields} K{sup (*)}{ell}{sup +}{ell}{sup -}, where {ell}{sup +}{ell}{sup -} is either e{sup +}e{sup -} or {mu}{sup +}{mu}{sup -}. We present measurements in two dilepton mass bins, one below the J/{psi} resonance and the other above, of the lepton forward-backward asymmetry {Alpha}{sub FB} and the longitudinal K* polarization F{sub L} in B {yields} K* {ell}{sup +}{ell}{sup -}, along with isospin rate asymmetries in B {yields} K*{ell}{sup +}{ell}{sup -} and B {yields} K{ell}{sup +}{ell}{sup -} final states.

Flood, Kevin T.; /Wisconsin U., Madison

2011-11-08T23:59:59.000Z

151

The splitted laser beam filamentation in interaction of laser and an exponential decay inhomogeneous underdense plasma  

Science Conference Proceedings (OSTI)

The splitted beam filamentation in interaction of laser and an exponential decay inhomogeneous underdense plasma is investigated. Based on Wentzel-Kramers-Brillouin (WKB) approximation and paraxial/nonparaxial ray theory, simulation results show that the steady beam width and single beam filamentation along the propagation distance in paraxial case is due to the influence of ponderomotive nonlinearity. In nonparaxial case, the influence of the off-axial of {alpha}{sub 00} and {alpha}{sub 02} (the departure of the beam from the Gaussian nature) and S{sub 02} (the departure from the spherical nature) results in more complicated ponderomotive nonlinearity and changing of the channel density and refractive index, which led to the formation of two/three splitted beam filamentation and the self-distortion of beam width. In addition, influence of several parameters on two/three splitted beam filamentation is discussed.

Xia Xiongping; Yi Lin [Department of Physics, Huazhong University of Science and Technology, Wuhan 430074 (China); Xu Bin [Department of Mathematics and Information Sciences, North China Institute of Water Conservancy and Hydroelectric Power, Zhengzhou 450011 (China); Lu Jianduo [Department of Physics, Huazhong University of Science and Technology, Wuhan 430074 (China); Hubei Province Key Laboratory of Systems Science in Metallurgical Process, Wuhan University of Science and Technology, Wuhan 430081 (China)

2011-10-15T23:59:59.000Z

152

Simple model for decay of superdeformed nuclei  

E-Print Network (OSTI)

Recent theoretical investigations of the decay mechanism out of a superdeformed nuclear band have yielded qualitatively different results, depending on the relative values of the relevant decay widths. We present a simple two-level model for the dynamics of the tunneling between the superdeformed and normal-deformed bands, which treats decay and tunneling processes on an equal footing. The previous theoretical results are shown to correspond to coherent and incoherent limits of the full tunneling dynamics. Our model accounts for experimental data in both the A~150 mass region, where the tunneling dynamics is coherent, and in the A~190 mass region, where the tunneling dynamics is incoherent.

C. A. Stafford; B. R. Barrett

1999-06-17T23:59:59.000Z

153

delta S = 2 nonleptonic hyperon decays  

E-Print Network (OSTI)

A sensitive search for the rare decays \\Omega^- \\to \\Lambda \\pi^- and \\Xi^0 \\to p \\pi^- has been performed using data from the 1997 run of the HyperCP (Fermilab E871) experiment. Limits on other such processes do not exclude the possibility of observable rates for |\\Delta S| = 2 nonleptonic hyperon decays, provided the decays occur through parity-odd operators. We obtain the branching-fraction limits B(\\Omega^- \\to \\Lambda \\pi^-)< 2.9 x 10^{-6} and B(\\Xi^0 \\to p \\pi^-)< 8.2 x 10^{-6}, both at 90% confidence level.

C. G. White; R. A. Burnstein; A. Chakravorty; A. Chan; Y. C. Chen; W. S. Choong; K. Clark; E. C. Dukes; C. Durandet; J. Felix; G. Gidal; P. Gu; H. R. Gustafson; C. Ho; T. Holmstrom; M. Huang; C. James; C. M. Jenkins; D. M. Kaplan; L. M. Lederman; N. Leros; M. J. Longo; F. Lopez; L. C. Lu; W. Luebke; K. B. Luk; K. S. Nelson; H. K. Park; J. -P. Perroud; D. Rajaram; H. A. Rubin; P. K. Teng; J. Volk; S. L. White; P. Zyla

2005-03-21T23:59:59.000Z

154

delta S = 2 nonleptonic hyperon decays  

E-Print Network (OSTI)

A sensitive search for the rare decays \\Omega^- \\to \\Lambda \\pi^- and \\Xi^0 \\to p \\pi^- has been performed using data from the 1997 run of the HyperCP (Fermilab E871) experiment. Limits on other such processes do not exclude the possibility of observable rates for |\\Delta S| = 2 nonleptonic hyperon decays, provided the decays occur through parity-odd operators. We obtain the branching-fraction limits B(\\Omega^- \\to \\Lambda \\pi^-)< 2.9 x 10^{-6} and B(\\Xi^0 \\to p \\pi^-)< 8.2 x 10^{-6}, both at 90% confidence level.

White, C G; Chakravorty, A; Chan, A; Chen, Y C; Choong, W S; Clark, K; Dukes, E C; Durandet, C; Flix, J; Gidal, G; Gu, P; Gustafson, H R; Ho, C; Holmstrom, T; Huang, M; James, C; Jenkins, C M; Kaplan, D M; Lederman, Leon Max; Leros, Nicolas; Longo, M J; Lpez, F; Lu, L C; Luebke, W; Luk, K B; Nelson, K S; Park, H K; Perroud, Jean-Pierre; Rajaram, D; Rubin, H A; Teng, P K; Volk, J; White, S L; Zyla, P

2005-01-01T23:59:59.000Z

155

Suppressed $B_s$ decays at CDF  

SciTech Connect

We review three recent results of the CDF collaboration on B{sub s}{sup 0} suppressed decays: the first search for CP-violation in the B{sub s}{sup 0} {yields} {phi}{phi} decay, where two CP-violating asymmetries expected to be zero in the Standard Model are measured, and the observation and the branching ratio measurements of B{sub s}{sup 0} {yields} J/{Psi} f{sub 0}(980) and B{sub s}{sup 0} {yields} J/{Psi} K{sup (*)} decays.

Dorigo, Mirco

2011-05-01T23:59:59.000Z

156

B to tau Leptonic and Semileptonic Decays  

Science Conference Proceedings (OSTI)

Decays of B mesons to states involving {tau} leptons can be used as a tool to search for the effects of new physics, such as those involving a charged Higgs boson. The experimental status of the decays B {yields} {tau}{nu} and B {yields} D{sup (*)}{tau}{nu} is discussed, together with limits on new physics effects from current results. Leptonic and semileptonic decays of B mesons into states involving {tau} leptons remain experimentally challenging, but can prove a useful tool for constraining Standard Model parameters, and also offer to constrain the effects of any new physics that may exist including the presence of a charged Higgs boson.

Barrett, M.; /Brunel U.

2011-11-17T23:59:59.000Z

157

Higgs boson decay to mu mubar gamma  

E-Print Network (OSTI)

The Higgs boson decay, H -> mu mubar gamma, is studied in the Standard Model at the tree and one-loop levels. It is shown that for Higgs boson masses above 110 GeV, the contribution to the radiative width from the one-loop level exceeds the contribution from the tree level, and for Higgs boson masses above 140 GeV, it even exceeds the contribution from the tree level decay H -> mu mubar. We also show that the contributions to the radiative decay width from the interference terms between the tree and one-loop diagrams are negligible.

Ali Abbasabadi; Wayne W. Repko

2000-04-17T23:59:59.000Z

158

Semileptonic B / Bs decays at Belle  

E-Print Network (OSTI)

The Belle experiment at the KEKB asymmetric energy e+e- collider recorded large data sets of both, B and Bs decays. Semileptonic decays B(s) -> X l nu (l = electron or muon) constitute approximately one fifth of the total decay width of B(s) mesons and play an important role in the determination of the CKM matrix elements V_ub and V_cb. Recent results from Belle are presented, including the study of B- -> Ds(*) K l nu, the first measurements of semi-inclusive modes B -> D(*) X l nu and the measurement of the inclusive branching fraction Bf(Bs -> X l nu).

Christian Oswald

2013-05-16T23:59:59.000Z

159

Particle decay branching ratios for states of astrophysical importance in 19Ne  

E-Print Network (OSTI)

We have measured proton and alpha-particle branching ratios of excited states in 19Ne formed using the 19F(3He,t) reaction at a beam energy of 25 MeV. These ratios have a large impact on the astrophysical reaction rates of 15O(alpha,gamma), 18F(p,gamma) and 18F(p,alpha), which are of interest in understanding energy generation in x-ray bursts and in interpreting anticipated gamma-ray observations of novae. We detect decay protons and alpha-particles using a silicon detector array in coincidence with tritons measured in the focal plane detector of our Enge split-pole spectrograph. The silicon array consists of five strip detectors of the type used in the Louvain-Edinburgh Detector Array, subtending angles from 130 degrees to 165 degrees with approximately 14% lab efficiency. The correlation angular distributions give additional confidence in some prior spin-parity assignments that were based on gamma branchings. We measure Gamma_p/Gamma=0.387+-0.016 for the 665 keV proton resonance, which agrees well with the direct measurement of Bardayan et al.

D. W. Visser; J. A. Caggiano; R. Lewis; W. B. Handler; A. Parikh; P. D. Parker

2003-08-08T23:59:59.000Z

160

Effective field theories for inclusive B decays  

E-Print Network (OSTI)

In this thesis, we study inclusive decays of the B meson. These allow one to determine CKM elements precisely and to search for physics beyond the Standard Model. We use the framework of effective field theories, in ...

Lee, Keith S. M. (Keith Seng Mun)

2006-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "alpha decay suspected" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

The Albedo Decay of Prairie Snows  

Science Conference Proceedings (OSTI)

Daily albedos of snow were measured between November and April, 196987, and were analyzed to determine the decay rate between snowfalls. The data essentially represent the snow accumulation season because the analysis was limited to days when ...

D. G. Baker; D. L. Ruschy; D. B. Wall

1990-02-01T23:59:59.000Z

162

Anomalous Radiative Decay of Heavy Higgs Boson  

E-Print Network (OSTI)

The radiative decay width of a heavy Higgs boson $H \\rightarrow W^+W^-\\gamma$ for a {\\it hard} photon is calculated in the Standard Model and its extension with anomalous $\\gamma WW$ couplings. Its dependence on the Higgs mass, the two unknown anomalous couplings, and the photon energy cutoff are studied in detail. We show that this radiative decay of a heavy Higgs is not very sensitive to a wide range of the anomalous couplings compared to the Standard Model result.

Tzu Chiang Yuan

1992-05-27T23:59:59.000Z

163

Passive Core Decay Heat Removal Performance Guideline  

Science Conference Proceedings (OSTI)

Passive decay heat removal systems operate without pumps when normal heat removal systems are not available. Safety is ensured by confirming that an adequate thermal margin is provided to accommodate various operating conditions, design uncertainties, and degradation. Guidelines to ensure adequate thermal performance are provided for three different system configurations.This report introduces utility systems engineers to the design and operation of passive decay heat removal systems and ...

2013-11-26T23:59:59.000Z

164

Rare B Meson Decays at the Tevatron  

SciTech Connect

Rare B meson decays are an excellent probe for beyond the Standard Model physics. Two very sensitive processes are the b {yields} s{mu}{sup +}{mu}{sup -} and B{sub s,d}{sup 0} {yields} {mu}{sup +}{mu}{sup -} decays. We report recent results at a center of mass energy of {radical}s = 1.96 TeV from CDF II using 7 fb{sup -1} at the Fermilab Tevatron Collider.

Hopkins, Walter

2012-01-01T23:59:59.000Z

165

Beta/alpha continuous air monitor  

DOE Patents (OSTI)

A single deep layer silicon detector in combination with a microcomputer, recording both alpha and beta activity and the energy of each pulse, distinquishing energy peaks using a novel curve fitting technique to reduce the natural alpha counts in the energy region where plutonium and other transuranic alpha emitters are present, and using a novel algorithm to strip out radon daughter contribution to actual beta counts. 7 figs.

Becker, G.K.; Martz, D.E.

1988-06-27T23:59:59.000Z

166

Available Technologies: Biological Production of Alpha Olefins ...  

APPLICATIONS OF TECHNOLOGY: Production of the following from sugar or starch: alpha olefins including 1-hexene, 1-decene, deca-1,5-diene, aromatic ...

167

SHOE V.1.5 ALPHA  

Energy Science and Technology Software Center (OSTI)

002913MLTPL00 Sandia Higher Order Elements (SHOE) v 0.5 alpha http://midas3.kitware.com/midas/folder/10328

168

Investigations of three-, four-, and five-particle decay channels of levels in light nuclei created using a {sup 9}C beam  

Science Conference Proceedings (OSTI)

The interactions of an E/A=70-MeV {sup 9}C beam with a Be target was used to populate levels in Be, B, and C isotopes, which undergo decay into many-particle exit channels. The decay products were detected in the HiRA array and the level energies were identified from their invariant mass. Correlations between the decay products were examined to deduce the nature of the decays, specifically to what extent all the fragments were created in one prompt step or whether the disintegration proceeded in a sequential fashion through long-lived intermediate states. In the latter case, information on the spin of the level was also obtained. Of particular interest is the five-body decay of the {sup 8}C ground state, which was found to disintegrate in two steps of two-proton decay passing through the {sup 6}Be{sub g.s.} intermediate state. The isobaric analog of {sup 8}C{sub g.s.} in {sup 8}B was also found to undergo two-proton decay to the isobaric analog of {sup 6}Be{sub g.s.} in {sup 6}Li. A 9.69-MeV state in {sup 10}C was found to undergo prompt four-body decay to the 2p + 2{alpha} exit channel. The two protons were found to have a strong enhancement in the diproton region and the relative energies of all four p-{alpha} pairs were consistent with the {sup 5}Li{sub g.s.} resonance.

Charity, R. J.; Elson, J. M.; Manfredi, J.; Shane, R.; Sobotka, L. G.; Brown, B. A.; Chajecki, Z.; Coupland, D.; Iwasaki, H.; Kilburn, M.; Lee, Jenny; Lynch, W. G.; Sanetullaev, A.; Tsang, M. B.; Winkelbauer, J.; Youngs, M.; Marley, S. T.; Shetty, D. V.; Wuosmaa, A. H.; Ghosh, T. K. [Departments of Chemistry and Physics, Washington University, St. Louis, Missouri 63130 (United States); National Superconducting Cyclotron Laboratory and Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824 (United States); Department of Physics, Western Michigan University, Kalamazoo, Michigan 49008 (United States); Variable Energy Cyclotron Centre, 1/AF Bidhannagar, Kolkata 700064 (India); Department of Physics and Astronomy, Rutgers University, New Brunswick, New Jersey 08903 (United States)

2011-07-15T23:59:59.000Z

169

Constraining |V(td)|/|V(ts)| Using Radiative Penguin B -> V(K*/rho/omega)gamma Decays  

SciTech Connect

Exclusive radiative penguin B decays, B {yields} (K*{sup 0}/K*{sup +}) and B {yields} ({rho}/{omega}){gamma}, are flavor-changing neutral-current (FCNC) processes. Studies of these decays are of special interest in testing Standard Model (SM) predictions and searching for other beyond-the-SM FCNC interactions. Using 89 x 10{sup 6} B{bar B} pairs from BABAR, we measure the branching fraction ({Beta}), CP-asymmetry ({Alpha}), and isospin asymmetry ({Delta}{sub 0-}) of B {yields} (K*{sup 0}/K*{sup +}){gamma} as follows: {Beta}(B{sup 0} {yields} K*{sup 0}{gamma}) = 3.92 {+-} 0.20(stat.) {+-} 0.24(syst.); {Beta}(B{sup +} {yields} K*{sup +}{gamma}) = 3.87 {+-} 0.28(stat.) {+-} 0.26(syst.); {Alpha}(B {yields} K*{gamma}) = -0.013 {+-} 0.36(stat.) {+-} 0.10(syst.); {Delta}{sub 0-}(B {yields} K*{gamma}) = 0.050 {+-} 0.045(stat.) {+-} 0.028(syst.) {+-} 0.024(R{sup +/0}). The 90% confidence intervals for the CP-asymmetry and the isospin-asymmetry in the B {yields} K*{gamma} decay are given as: -0.074 < {Alpha}(B {yields} K*{gamma}) < 0.049, -0.046 < {Delta}{sub 0-} (B {yields} K*{gamma}) < 0.146. We also search for B {yields} ({rho}/{omega}){gamma} decays using 211 x 10{sup 6} B{bar B} pairs from BABAR. No evidence for these decays is found. We set the upper limits at 90% confidence level for these decays: {Beta}(B{sup 0} {yields} {rho}{sup 0}{gamma}) < 0.4 x 10{sup -6}; {Beta}(B{sup +}{yields} {rho}{sup =}{gamma}) < 1.8 x 10{sup -6}; {Beta}(B{sup 0} {yields} {omega}{gamma}) < 1.0 x 10{sup -6}; {bar {Beta}}(B {yields} ({rho}/{omega}){gamma}) < 1.2 x 10{sup -6}. These results are in good agreement with the SM predictions. The branching fractions of these decays are then used to constrain the ratio |V{sub td}|/|V{sub ts}|.

Tan, Ping; /Wisconsin U., Madison

2006-03-08T23:59:59.000Z

170

Constraining |V(td)|/|V(ts)| Using Radiative Penguin B -> V(K*/rho/omega)gamma Decays  

Science Conference Proceedings (OSTI)

Exclusive radiative penguin B decays, B {yields} (K*{sup 0}/K*{sup +}) and B {yields} ({rho}/{omega}){gamma}, are flavor-changing neutral-current (FCNC) processes. Studies of these decays are of special interest in testing Standard Model (SM) predictions and searching for other beyond-the-SM FCNC interactions. Using 89 x 10{sup 6} B{bar B} pairs from BABAR, we measure the branching fraction ({Beta}), CP-asymmetry ({Alpha}), and isospin asymmetry ({Delta}{sub 0-}) of B {yields} (K*{sup 0}/K*{sup +}){gamma} as follows: {Beta}(B{sup 0} {yields} K*{sup 0}{gamma}) = 3.92 {+-} 0.20(stat.) {+-} 0.24(syst.); {Beta}(B{sup +} {yields} K*{sup +}{gamma}) = 3.87 {+-} 0.28(stat.) {+-} 0.26(syst.); {Alpha}(B {yields} K*{gamma}) = -0.013 {+-} 0.36(stat.) {+-} 0.10(syst.); {Delta}{sub 0-}(B {yields} K*{gamma}) = 0.050 {+-} 0.045(stat.) {+-} 0.028(syst.) {+-} 0.024(R{sup +/0}). The 90% confidence intervals for the CP-asymmetry and the isospin-asymmetry in the B {yields} K*{gamma} decay are given as: -0.074 Alpha}(B {yields} K*{gamma}) < 0.049, -0.046 < {Delta}{sub 0-} (B {yields} K*{gamma}) < 0.146. We also search for B {yields} ({rho}/{omega}){gamma} decays using 211 x 10{sup 6} B{bar B} pairs from BABAR. No evidence for these decays is found. We set the upper limits at 90% confidence level for these decays: {Beta}(B{sup 0} {yields} {rho}{sup 0}{gamma}) < 0.4 x 10{sup -6}; {Beta}(B{sup +}{yields} {rho}{sup =}{gamma}) < 1.8 x 10{sup -6}; {Beta}(B{sup 0} {yields} {omega}{gamma}) < 1.0 x 10{sup -6}; {bar {Beta}}(B {yields} ({rho}/{omega}){gamma}) < 1.2 x 10{sup -6}. These results are in good agreement with the SM predictions. The branching fractions of these decays are then used to constrain the ratio |V{sub td}|/|V{sub ts}|.

Tan, Ping; /Wisconsin U., Madison

2006-03-08T23:59:59.000Z

171

Measurements of B -> V gamma Decays  

SciTech Connect

The standard model has been highly successful at describing current experimental data. However, extensions of the standard model predict particles that have masses at energy scales that are above the electroweak scale. The flavor-changing neutral current processes of the B meson are sensitive to the influences of these new physics contributions. These processes proceed through loop diagrams, thus allowing new physics to enter at the same order as the standard model. New physics may contribute to the enhancement or suppression of rate asymmetries or the decay rates of these processes. The transition B {yields} V{gamma} (V = K*(892), {rho}(770), {omega}(782), {phi}(1020)) represents radiative decays of the B meson that proceed through penguin processes. Hadronic uncertainties limit the theoretical accuracy of the prediction of the branching fractions. However, uncertainties, both theoretical and experimental, are much reduced when considering quantities involving ratios of branching fractions, such as CP or isospin asymmetries. The most dominant exclusive radiative b {yields} s transition is B {yields} K*{gamma}. We present the best measurements of the branching fractions, direct CP, and isospin asymmetries of B {yields} K*{gamma}. The analogous b {yields} d transitions are B {yields} {rho}{gamma} and B {yields} {omega}{gamma}, which are suppressed by a factor of |V{sub td}/V{sub ts}|{sup 2} {approx} 0.04 relative to B {yields} K*{gamma}. A measurement of the branching fractions and isospin asymmetry of B{sup +} {yields} {rho}{sup +}{gamma} and B{sup 0} {yields} {rho}{sup 0}{gamma}, as well as a search for B {yields} {omega}{gamma}, are also given. These measurements are combined to calculate the ratio of CKM matrix elements |V{sub td}/V{sub ts}|, which corresponds to the length of one side of the unitary triangle. Finally, we present a search for the penguin annihilation process B {yields}{phi}{gamma}. We use a sample of 383 million B{bar B} events collected with the BABAR detector at the PEP-II asymmetric-energy B factory for the analysis of B {yields} K*{gamma}. We measure the branching fractions {Beta}(B{sup 0} {yields} K*{sup 0}{gamma}) = (4.47 {+-} 0.10 {+-} 0.16) x 10{sup -5} and {Beta}(B{sup +} {yields} K*{sup +}{gamma}) = (4.22 {+-} 0.14 {+-} 0.16) x 10{sup -5}. We measure the direct CP asymmetry to be -0.033 < {Alpha}{sub CP} (B {yields} K*{gamma}) < 0.028 and the isospin asymmetry to be 0.017 < {Delta}{sub 0-} < 0.116, where the limits are determined at the 90% C.L. and include both the statistical and systematic uncertainties. Using a sample of 347 million B{bar B} events, we measure the branching fractions {Beta}(B{sup +} {yields} {rho}{sup +}{gamma}) = (1.10{sub -0.33}{sup +0.37} {+-} 0.09) x 10{sup -6} and {Beta}(B{sup 0} {yields} {rho}{sup 0}{gamma}) = (0.79{sub -0.20}{sup +0.22} {+-} 0.06) x 10{sup -6}, the isospin asymmetry {Delta} = -0.35 {+-} 0.27, and set a 90% C.L. upper limit {Beta}(B {yields} {omega}{gamma}) < 0.78 x 10{sup -6}. We also measure the isospin-averaged branching fraction {Beta}(B {yields} ({rho}/{omega}){gamma}) = (1.25{sub -0.24}{sup +0.25} {+-} 0.09) x 10{sup -6}, from which we determine |V{sub td}/V{sub ts}|= 0.200{sub -0.020}{sup +0.021} {+-} 0.015, where the first uncertainty is experimental and the second theoretical. Finally, a sample of 124 million B{bar B} events is used to set an upper limit of {Beta}(B {yields} {phi}{gamma}) < 8.5 x 10{sup -7} at the 90% C.L.

Yarritu, Aaron K.; /Stanford U., Phys. Dept.

2010-09-02T23:59:59.000Z

172

Alpha Technologies | Open Energy Information  

Open Energy Info (EERE)

Technologies Technologies Jump to: navigation, search Name Alpha Technologies Place Bellingham, Washington State Zip 98226 Sector Services, Solar Product Bellingham (WA)-based firm offering, among other products, power conversion products designed specifically for the PV market, plus installation services for solar systems. Coordinates 48.75235°, -122.471219° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":48.75235,"lon":-122.471219,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

173

Search for Hadronic Decays of a Light Higgs Boson in the Radiative Decay ???A?  

E-Print Network (OSTI)

We search for hadronic decays of a light Higgs boson (A?) produced in radiative decays of an ?(2S) or ?(3S) meson, ???A?. The data have been recorded by the BABAR experiment at the ?(3S) and ?(2S) center-of-mass energies ...

Cowan, Ray Franklin

174

Alpha Renewable Energy | Open Energy Information  

Open Energy Info (EERE)

Renewable Energy Renewable Energy Jump to: navigation, search Name Alpha Renewable Energy Place Atlanta, Georgia Sector Biomass Product Manufacturer of biomass wood gas stoves and standalone power generators for rural areas. References Alpha Renewable Energy[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Alpha Renewable Energy is a company located in Atlanta, Georgia . References ↑ "Alpha Renewable Energy" Retrieved from "http://en.openei.org/w/index.php?title=Alpha_Renewable_Energy&oldid=342033" Categories: Clean Energy Organizations Companies Organizations Stubs What links here Related changes Special pages Printable version Permanent link Browse properties

175

Parametric Decay during HHFW on NSTX  

DOE Green Energy (OSTI)

High Harmonic Fast Wave (HHFW) heating experiments on NSTX have been observed to be accompanied by significant edge ion heating (T{sub i} >> T{sub e}). This heating is found to be anisotropic with T{sub perp} > T{sub par}. Simultaneously, coherent oscillations have been detected with an edge Langmuir probe. The oscillations are consistent with parametric decay of the incident fast wave ({omega} > 13{omega}{sub ci}) into ion Bernstein waves and an unobserved ion-cyclotron quasi-mode. The observation of anisotropic heating is consistent with Bernstein wave damping, and the Bernstein waves should completely damp in the plasma periphery as they propagate toward a cyclotron harmonic resonance. The number of daughter waves is found to increase with rf power, and to increase as the incident wave's toroidal wavelength increases. The frequencies of the daughter wave are separated by the edge ion cyclotron frequency. Theoretical calculations of the threshold for this decay in uniform plasma indicate an extremely small value of incident power should be required to drive the instability. While such decays are commonly observed at lower harmonics in conventional ICRF heating scenarios, they usually do not involve the loss of significant wave power from the pump wave. On NSTX an estimate of the power loss can be found by calculating the minimum power required to support the edge ion heating (presumed to come from the decay Bernstein wave). This calculation indicates at least 20-30% of the incident rf power ends up as decay waves.

J.R. Wilson; S. Bernabei; T. Biewer; S. Diem; J. Hosea; B. LeBlanc; C.K. Phillips; P. Ryan; D.W. Swain

2005-05-13T23:59:59.000Z

176

Alpha1 and Alpha2 Integrins Mediate Invasive Activity of Mouse Mammary Carcinoma Cells through Regulation of Stromelysin-1 Expression  

Science Conference Proceedings (OSTI)

Tumor cell invasion relies on cell migration and extracellular matrix proteolysis. We investigated the contribution of different integrins to the invasive activity of mouse mammary carcinoma cells. Antibodies against integrin subunits {alpha}6 and {beta}1, but not against {alpha}1 and {alpha}2, inhibited cell locomotion on a reconstituted basement membrane in two-dimensional cell migration assays, whereas antibodies against {beta}1, but not against a6 or {alpha}2, interfered with cell adhesion to basement membrane constituents. Blocking antibodies against {alpha}1 integrins impaired only cell adhesion to type IV collagen. Antibodies against {alpha}1, {alpha}2, {alpha}6, and {beta}1, but not {alpha}5, integrin subunits reduced invasion of a reconstituted basement membrane. Integrins {alpha}1 and {alpha}2, which contributed only marginally to motility and adhesion, regulated proteinase production. Antibodies against {alpha}1 and {alpha}2, but not {alpha}6 and {beta}1, integrin subunits inhibited both transcription and protein expression of the matrix metalloproteinase stromelysin-1. Inhibition of tumor cell invasion by antibodies against {alpha}1 and {alpha}2 was reversed by addition of recombinant stromelysin-1. In contrast, stromelysin-1 could not rescue invasion inhibited by anti-{alpha}6 antibodies. Our data indicate that {alpha}1 and {alpha}2 integrins confer invasive behavior by regulating stromelysin-1 expression, whereas {alpha}6 integrins regulate cell motility. These results provide new insights into the specific functions of integrins during tumor cell invasion.

Lochter, Andre; Navre, Marc; Werb, Zena; Bissell, Mina J

1998-06-29T23:59:59.000Z

177

Exclusive Double Charmonium Production from $?$ Decay  

E-Print Network (OSTI)

The exclusive decay of $\\Upsilon$ to a vector plus pseudoscalar charmonium is studied in perturbative QCD. The corresponding branching ratios are predicted to be of order $10^{-6}$ for first three $\\Upsilon$ resonances, and we expect these decay modes should be discovered in the prospective high-luminosity $e^+e^-$ facilities such as super $B$ experiment. As a manifestation of the short-distance loop contribution, the relative phases among strong, electromagnetic and radiative decay amplitudes can be deduced. It is particularly interesting to find that the relative phase between strong and electromagnetic amplitudes is nearly orthogonal. The resonance-continuum interference effect for double charmonium production near various $\\Upsilon$ resonances in $e^+e^-$ annihilation is addressed.

Yu Jia

2007-06-25T23:59:59.000Z

178

{delta}L=2 hyperon semileptonic decays  

Science Conference Proceedings (OSTI)

We compute the rates of semileptonic B{sub A}{yields}B{sub B}l{sup -}l{sup -} (l=e or {mu}) hyperon transitions in a model where intermediate states involve loops of baryons and a Majorana neutrino. These rates turn out to be well below present experimental bounds and other theoretical estimates. From the experimental upper limit on the {xi}{sup -}{yields}p{mu}{sup -}{mu}{sup -} decay, we derive the bound {<=}22 TeV for the effective Majorana mass of the muon neutrino. Also, an estimate of background contributions for these decays due to the allowed B{sub A}{yields}B{sub B}l{sup -}l{sup -}{nu}{nu} decays is provided.

Barbero, C.; Mariano, A. [Departamento de Fisica, Universidad Nacional, de La Plata, cc 67, 1900 La Plata (Argentina); Li, Ling-Fong [Department of Physics, Carnegie Mellon University, Pittsburg, Pennsylvania 15213 (United States); Castro, G. Lopez [Departamento de Fisica, Cinvestav, Apartado Postal 14-740, 07000 Mexico D.F. (Mexico)

2007-12-01T23:59:59.000Z

179

Factorization in B ---> V gamma decays  

SciTech Connect

The factorization properties of the radiative decays B {yields} V{gamma} are analyzed at leading order in 1/m{sub b} using the soft-collinear effective theory. It is shown that the decay amplitudes can be expressed in terms of a B {yields} V form factor evaluated at q{sup 2} = 0, light-cone distribution amplitudes of the B and V mesons, and calculable hard-scattering kernels. The renormalization-group equations in the effective theory are solved to resum perturbative logarithms of the different scales in the decay process. Phenomenological implications for the B {yields} K*{gamma} branching ratio, isospin asymmetry, and CP asymmetries are discussed, with particular emphasis on possible effects from physics beyond the Standard Model.

Becher, Thomas; /Fermilab; Hill, Richard J.; /SLAC; Neubert, Matthias; /Cornell U., LEPP

2005-03-01T23:59:59.000Z

180

New results for rare muon decays  

Science Conference Proceedings (OSTI)

Branching-ratio limits obtained with the Crystal Box detector are presented for the rare muon decays ..mu.. ..-->.. eee, ..mu.. ..-->.. e..gamma.., and ..mu.. ..-->.. e..gamma gamma... These decays, which violate the conservation of separate lepton-family numbers, are expected to occur in many extensions to the standard model. We found no candidates for the decay ..mu.. ..-->.. eee, yielding an upper limit for the branching ratio of B/sub ..mu..3e/ .. e..gamma.. candidates yields an upper limit of B/sub ..mu..e..gamma../ .. e..gamma gamma.. candidates gives an upper limit of B/sub ..mu..e..gamma gamma../ < 7.2 x 10/sup -11/. These results strengthen the constraints on models that allow transitions between lepton families.

Mischke, R.E.; Bolton, R.D.; Bowman, J.D.; Cooper, M.D.; Frank, J.S.; Hallin, A.L.; Heusi, P.A.; Hoffman, C.M.; Hogan, G.E.; Mariam, F.G.

1986-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "alpha decay suspected" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

Lepton Flavor Violating Decays - Review & Outlook  

E-Print Network (OSTI)

Here I review the status and prospects of experimental investigations into lepton flavor violation (LFV) in charged leptons. Rare LFV processes are naturally expected to occur through loops of TeV scale particles predicted by supersymmetric theories or other models beyond the Standard Model. In contrast to physics of quark flavors that is dominated by the Cabibbo-Kobayashi-Maskawa matrix, LFV in charged leptons is a definitive signal of new physics. Currently active researches are rare tau decay searches at the B factories. The MEG experiment will soon start a sensitive search for the LFV muon decay, mu to e gamma. Prospects for searches at the LHC, a possibility of a fixed target LFV experiment with high energy muons, and a sensitivity of leptonic kaon decays to LFV are also briefly discussed.

Toshinori Mori

2006-05-30T23:59:59.000Z

182

Chiral approach to Phi Radiative Decays  

E-Print Network (OSTI)

(980) and f0(980) according to ? ? f0, a0 + ? and hence are generally considered to provide valuable information about the puzzling light scalar mesons[2] of low energy QCD. The theoretical analysis of this type of decay was initiated by Achasov and Ivanchenko... [3] and followed up by many others [4]. The starting point was the observation that the ? meson decays about 50 per cent of the time into K+K?. Since this final state can easily annihilate to produce either an f0 or a0 together with an emitted photon...

Black, Deirdre; Harada, Masayasu; Shechter, Joseph

2006-01-01T23:59:59.000Z

183

The double-beta decay: Theoretical challenges  

Science Conference Proceedings (OSTI)

Neutrinoless double beta decay is a unique process that could reveal physics beyond the Standard Model of particle physics namely, if observed, it would prove that neutrinos are Majorana particles. In addition, it could provide information regarding the neutrino masses and their hierarchy, provided that reliable nuclear matrix elements can be obtained. The two neutrino double beta decay is an associate process that is allowed by the Standard Model, and it was observed for about ten nuclei. The present contribution gives a brief review of the theoretical challenges associated with these two process, emphasizing the reliable calculation of the associated nuclear matrix elements.

Horoi, Mihai [Department of Physics, Central Michigan University, Mount Pleasant, Michigan, 48859 (United States)

2012-11-20T23:59:59.000Z

184

Neutrinoless double beta decay and neutrino masses  

SciTech Connect

Neutrinoless double beta decay (0{nu}{beta}{beta}) is a promising test for lepton number violating physics beyond the standard model (SM) of particle physics. There is a deep connection between this decay and the phenomenon of neutrino masses. In particular, we will discuss the relation between 0{nu}{beta}{beta} and Majorana neutrino masses provided by the so-called Schechter-Valle theorem in a quantitative way. Furthermore, we will present an experimental cross check to discriminate 0{nu}{beta}{beta} from unknown nuclear background using only one isotope, i.e., within one experiment.

Duerr, Michael [Max-Planck-Institut fuer Kernphysik, Saupfercheckweg 1, 69117 Heidelberg (Germany)

2012-07-27T23:59:59.000Z

185

Search for Oscillation of the Electron-Capture Decay Probability of $^{142}$Pm  

E-Print Network (OSTI)

We have searched for time modulation of the electron capture decay probability of $^{142}$Pm in an attempt to confirm a recent claim from a group at the Gesellschaft f\\"{u}r Schwerionenforschung (GSI). We produced $^{142}$Pm via the $^{124}$Sn($^{23}$Na, 5n)$^{142}$Pm reaction at the Berkeley 88-Inch Cyclotron with a bombardment time short compared to the reported modulation period. Isotope selection by the Berkeley Gas-filled Separator is followed by implantation and a long period of monitoring the $^{142}$Nd K$_{\\alpha}$ x-rays from the daughter. The decay time spectrum of the x-rays is well-described by a simple exponential and the measured half-life of 40.68(53) seconds is consistent with the accepted value. We observed no oscillatory modulation at the proposed frequency at a level 31 times smaller than that reported by Litvinov {\\it et al.} (Phys. Lett. B 664 (2008) 162; arXiv:0801.2079 [nucl-ex]). A literature search for previous experiments that might have been sensitive to the reported modulation uncovered another example in $^{142}$Eu electron-capture decay. A reanalysis of the published data shows no oscillatory behavior.

P. A. Vetter; R. M. Clark; J. Dvorak; S. J. Freedman; K. E. Gregorich; H. B. Jeppesen; D. Mittelberger; M. Wiedeking

2008-07-03T23:59:59.000Z

186

Search for Oscillation of the Electron-Capture Decay Probability of Pm-142  

SciTech Connect

We have searched for time modulation of the electron capture decay probability of 142Pm in an attempt to confirm a recent claim from a group at the Gesellschaft fur Schwerionenforschung (GSI). We produced 142Pm via the 124Sn(23Na, 5n)142Pm reaction at the Berkeley 88-Inch Cyclotron with a bombardment time short compared to the reported modulation period. Isotope selection by the Berkeley Gas-filled Separator is followed by implantation and a long period of monitoring the 142Nd K alpha x-rays from the daughter. The decay time spectrum of the x-rays is well-described by a simple exponential and the measured half-life of 40.68(53) seconds is consistent with the accepted value. We observed no oscillatory modulation at the proposed frequency at a level 31 times smaller than that reported by Litvinov (Phys. Lett. B 664 (2008) 162). A literature search for previous experiments that might have been sensitive to the reported modulation uncovered another example in 142Eu electron-capture decay. A reanalysis of the published data shows no oscillatory behavior.

Vetter, Paul A; Vetter, Paul; Clark, Roderick; Dvorak, Jan; Freedman, Stuart; Gregorich, Kenneth; Jeppesen, Henrik; Mittelberger, Daniel; Wiedeking, Mathis

2008-07-03T23:59:59.000Z

187

The formation and decay of superheavy nuclei produced in $^{48}Ca$-induced reactions  

E-Print Network (OSTI)

The formation of superheavy nuclei in $^{48}Ca+^{232}Th$, $^{238}U$, $^{242,244}Pu$ and $^{248}Cm$ reactions and their subsequent decay are studied within the quantum mechanical fragmentation theory (QMFT) and the QMFT based preformed cluster-decay model (PCM) of Gupta and collaborators. According to QMFT, all these $^{48}Ca$-induced reactions are cold fusion reactions with relative excitation energies larger than for the $Pb$-induced cold fusion reactions and smaller than for the lighter beam i.e. $Mg$, $Si$ or $S$-induced hot fusion reactions. The same reactions were first suggested by Gupta et al. in 1977 on the basis of QMFT, and this study re-establishes the same result. In fact, for such heavy isotopes of Z=110 to 116, $^{50}Ca$ is shown to be a better beam for cold fusion, but $^{50}Ca$ is a radioactive nucleus. The $\\alpha$-decay half-lives of these nuclei after 3n and/ or 4n evaporations, i.e. of the evaporation residues of these compound systems, calculated on PCM compare reasonably well with experi...

Kumar, Sushil; Gupta, Raj K; Munzenberg, G; Scheid, W; 10.1088/0954-3899/29/4/303

2011-01-01T23:59:59.000Z

188

Alpha-Particle Condensation in Nuclear Systems  

E-Print Network (OSTI)

The onset of quartetting, i.e. alpha-particle condensation, in symmetric nuclear matter is studied with the help of an in-medium modified four nucleon equation. It is found that at very low density quartetting wins over pairing, because of the strong binding of the alpha-particles. The critical temperature can reach values up to around 6 MeV. Also the disappearance of alpha-particles with increasing density, i.e. the Mott transition, is investigated. In finite nuclei the Hoyle state, that is the 0_2^+ of 12C, is identified as an "alpha-particle condensate" state. It is conjectured that such states also exist in heavier n alpha-nuclei, like 16O, 20Ne, etc. For instance the 6-th 0^+ state of 16O at 15.1 MeV is identified from a theoretical analysis as being a strong candidate for an alpha condensate state. Exploratory calculations are performed for the density dependence of the alpha condensate fraction at zero temperature to address the suppression of the four-particle condensate below nuclear-matter density. Possible quartet condensation in other systems is discussed briefly

Y. Funaki; T. Yamada; H. Horiuchi; G. Rpke; P. Schuck; A. Tohsaki

2008-09-03T23:59:59.000Z

189

Alpha Energy formerly Altair Energy | Open Energy Information  

Open Energy Info (EERE)

Washington State . References "Alpha Energy (formerly Altair Energy)" Retrieved from "http:en.openei.orgwindex.php?titleAlphaEnergyformerlyAltairEnergy&oldid342032...

190

Review of K$sup 0$ decays  

SciTech Connect

From meeting of the division of particles and fields; Berkeley, California, USA (13 Aug 1973). A review is given of selected topics in K/sup 0/ decays for which recent results have led to substantial progress and/or cortroversy. (auth)

Nygren, D.R.

1973-08-01T23:59:59.000Z

191

Nuclear physics aspects of double beta decay  

E-Print Network (OSTI)

Comprehensive description of the phenomenology of the $\\beta\\beta$ decay is given, with emphasis on the nuclear physics aspects. After a brief review of the neutrino oscillation results and of motivation to test the lepton number conservation, the mechanism of the $0\

Petr Vogel

2008-07-15T23:59:59.000Z

192

Light Hadron Masses and Decay Constants  

E-Print Network (OSTI)

The extraction of the light hadron spectrum from a first-principle Quantum Chromodynamics approach is a profound application for lattice simulations of Quantum Chromodynamics. This review will cover recent lattice results for the masses and decay constants of the light hadrons. In particular, the applicability of different approaches for the extrapolation towards the physical point will be discussed.

Enno E. Scholz

2009-11-11T23:59:59.000Z

193

Anatomy of neck configuration in fission decay  

E-Print Network (OSTI)

The anatomy of neck configuration in the fission decay of Uranium and Thorium isotopes is investigated in a microscopic study using Relativistic mean field theory. The study includes $^{236}U$ and $^{232}Th$ in the valley of stability and exotic neutron rich isotopes $^{250}U$, $^{256}U$, $^{260}U$, $^{240}Th$, $^{250}Th$, $^{256}Th$ likely to play important role in the r-process nucleosynthesis in stellar evolution. Following the static fission path, the neck configurations are generated and their composition in terms of the number of neutrons and protons are obtained showing the progressive rise in the neutron component with the increase of mass number. Strong correlation between the neutron multiplicity in the fission decay and the number of neutrons in the neck is seen. The maximum neutron-proton ratio is about 5 for $^{260}$U and $^{256}$Th suggestive of the break down of liquid-drop picture and inhibition of the fission decay in still heavier isotopes. Neck as precursor of a new mode of fission decay like multi-fragmentation fission may also be inferred from this study.

S. K. Patra; R. K. Choudhury; L. Satpathy

2010-05-10T23:59:59.000Z

194

Search for the decay B0???  

E-Print Network (OSTI)

We report the result of a search for the rare decay B0??? [B superscript 0???] in 426??fb-1 [fb superscript -1] of data, corresponding to 226106 B0B? 0 [226 x 10 superscript 6 B superscript 0 B? superscript 0] pairs, ...

Cowan, Ray Franklin

195

Decay of a Near-Inertial Wave  

Science Conference Proceedings (OSTI)

The decay of a downward propagating near-inertial wave was observed over four days. During this short period, the energy of the near-inertial wave decreased by 70%. The shear layers produced by the wave were regions of enhanced turbulent ...

Dave Hebert; J. N. Moum

1994-11-01T23:59:59.000Z

196

Nuclear diagnostic for fast alpha particles  

DOE Patents (OSTI)

This invention relates generally to high energy confined plasmas and more particularly is directed to measuring the velocity distribution of confined energetic alpha particles resulting from deuterium-tritium fusion reactions in a confined energetic plasma.

Grisham, L.R.; Post, D.E. Jr.; Dawson, J.M.

1983-11-23T23:59:59.000Z

197

Comparing radiative and recoil corrections in neutron beta-decay and inverse beta-decay  

E-Print Network (OSTI)

The inverse $\\beta$-decay reaction, anti-nu_e + p --> e^+ + n, for low-energy anti-neutrinos coming from nuclear reactors is of great current interest in connection with high-precision measurements of the neutrino mixing angle $\\theta_{13}$. We have previously derived analytic expressions, up to next-to-leading order in heavy-baryon chiral perturbation theory, for the radiative corrections (RCs) and the nucleon-recoil corrections both for this reaction and for the related neutron $\\beta$-decay process. We investigate here the numerical consequences of these analytic expressions. We show that the recoil corrections are small for neutron $\\beta$-decay, but for inverse $\\beta$-decay, the recoil corrections are comparable in size to the RCs for typical energies of reactor anti-neutrinos, and they have opposite signs. It turns out that the RCs and the recoil corrections exhibit very different dependences on the neutrino energy.

Raha, U; Kubodera, K

2012-01-01T23:59:59.000Z

198

Discovering a Higgs boson decaying to four jets in supersymmetric cascade decays  

SciTech Connect

The Higgs boson may dominantly decay to four light jets through a light pseudoscalar intermediary: h{yields}2{eta}{yields}4j, making reconstruction at the LHC particularly challenging. We explore the phenomenology of such ''buried Higgs'' scenarios in which the primary discovery channel of the Higgs is in cascade decays of superpartners. QCD backgrounds that would otherwise overwhelm the Higgs decay are suppressed by the requirement of high p{sub T} jets and large missing transverse momentum that are the typical signatures of TeV scale supersymmetry. Utilizing jet substructure techniques, we find that for buried Higgses in the 100-120 GeV range, a 5{sigma} discovery can be expected with roughly 10-25 fb{sup -1} of data at E{sub CM}=14 TeV. For lighter Higgs bosons, the signal is contaminated by hadronically decaying W bosons, and discovery remains an unsolved challenge.

Bellazzini, Brando; Csaki, Csaba [Institute for High Energy Phenomenology, Newman Laboratory of Elementary Particle Physics, Cornell University, Ithaca, New York 14853 (United States); Hubisz, Jay; Shao, Jing [201 Physics Building, Syracuse University, Syracuse, New York 13244 (United States)

2011-05-01T23:59:59.000Z

199

Comparing radiative and recoil corrections in neutron beta-decay and inverse beta-decay  

E-Print Network (OSTI)

The inverse $\\beta$-decay reaction, anti-nu_e + p --> e^+ + n, for low-energy anti-neutrinos coming from nuclear reactors is of great current interest in connection with high-precision measurements of the neutrino mixing angle $\\theta_{13}$. We have previously derived analytic expressions, up to next-to-leading order in heavy-baryon chiral perturbation theory, for the radiative corrections (RCs) and the nucleon-recoil corrections both for this reaction and for the related neutron $\\beta$-decay process. We investigate here the numerical consequences of these analytic expressions. We show that the recoil corrections are small for neutron $\\beta$-decay, but for inverse $\\beta$-decay, the recoil corrections are comparable in size to the RCs for typical energies of reactor anti-neutrinos, and they have opposite signs. It turns out that the RCs and the recoil corrections exhibit very different dependences on the neutrino energy.

U. Raha; F. Myhrer; K. Kubodera

2012-07-18T23:59:59.000Z

200

Measurements of alpha_s from hadronic event shapes in e+e- annihilation  

E-Print Network (OSTI)

New studies of hadronic event shape observables in e+ e- collisions between 13 and 183 GeV CM energy have enabled the running of alpha_s to be confirmed and the validity of non-perturbative power-law corrections to be investigated. A more precise value of alpha_s(M_Z) with reduced theoretical errors has been reported from fitting 18 oriented event shape distributions measured in one experiment at the Z.

J. C. Thompson

1998-12-02T23:59:59.000Z

Note: This page contains sample records for the topic "alpha decay suspected" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

Suspect Counterfeit Items Criteria Review and Approach Document , Phase 1 - Management - Developed By NNSA/Nevada Site Office Facility Representative Division  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Suspect/Counterfeit Items Suspect/Counterfeit Items Criteria Review and Approach Document (CRAD) NNSA/Nevada Site Office Facility Representative Division Phase 1 - Management Performance Objective: Management should have a formal system under Quality Assurance with adequate controls defined and implemented to identify and preclude Suspect/Counterfeit Items (S/CI) from being introduced into safety systems and applications that create potential hazards. CRITERIA: Management should have a formal system of controls in place for assurance that all items procured meet the requirements for their intended use. Management should have a system of mechanisms to continuously maintain current, accurate, updated information on SC/Is and associated suppliers using all available sources. Management should have a training program with detailed records that

202

A Statistical Plume Model with First-Order Decay  

Science Conference Proceedings (OSTI)

Many atmospheric contaminants decay or react in the atmosphere. in situations such as the diffusion of radioactive contaminants, certain chemical pollutants and viable microorganisms, a first-order decay rate is considered to be an appropriate ...

Thomas J. Overcamp

1982-11-01T23:59:59.000Z

203

Methods for the synthesis and polymerization of .alpha.,.alpha.'-dihalo-p-xylenes  

DOE Patents (OSTI)

The present invention describes an improved method for the polymerization of .alpha.,.alpha.-dihalo-p-xylene's such as the .alpha.,.alpha.'-dihalo-2-methoxy-5-(2-ethylhexyloxy)-xylene's. The procedure for synthesis is based on the specific order of addition of reagents and the use of an anionic initiator that allows control of the molecular weight of the polymer. The molecular weight control allows processability of the polymer which is important for its utility in applications including in light-emitting-diodes, field effect transistors and photovoltaic devices.

Ferraris, John P. (Coppell, TX); Neef, Charles J. (Garland, TX)

2002-07-30T23:59:59.000Z

204

PyDecay/GraphPhys: A Unified Language and Storage System for Particle Decay Process Descriptions  

SciTech Connect

To ease the tasks of Monte Carlo (MC) simulation and event reconstruction (i.e. inferring particle-decay events from experimental data) for long-term BaBar data preservation and analysis, the following software components have been designed: a language ('GraphPhys') for specifying decay processes, common to both simulation and data analysis, allowing arbitrary parameters on particles, decays, and entire processes; an automated visualization tool to show graphically what decays have been specified; and a searchable database storage mechanism for decay specifications. Unlike HepML, a proposed XML standard for HEP metadata, the specification language is designed not for data interchange between computer systems, but rather for direct manipulation by human beings as well as computers. The components are interoperable: the information parsed from files in the specification language can easily be rendered as an image by the visualization package, and conversion between decay representations was implemented. Several proof-of-concept command-line tools were built based on this framework. Applications include building easier and more efficient interfaces to existing analysis tools for current projects (e.g. BaBar/BESII), providing a framework for analyses in future experimental settings (e.g. LHC/SuperB), and outreach programs that involve giving students access to BaBar data and analysis tools to give them a hands-on feel for scientific analysis.

Dunietz, Jesse N.; /MIT /SLAC

2011-06-22T23:59:59.000Z

205

Search for ? + / EC double beta decay of 120 Te  

Science Conference Proceedings (OSTI)

We present a search for ? + / EC double beta decay of 120 Te performed with the CUORICINO experiment

C. Tomei; The CUORICINO Collaboration

2011-01-01T23:59:59.000Z

206

The Large Area Lyman Alpha Survey  

E-Print Network (OSTI)

The Lyman-$\\alpha$ line is expected to be strong in the presence of active star formation and the absence of dust, making it a good tool for finding chemically primitive galaxies in the early universe. We report on a new survey for high redshift Lyman-$\\alpha$ sources, the Large Area Lyman Alpha (LALA) survey. Our survey achieves an unprecedented combination of volume and sensitivity by using narrow-band filters on the new $8192^2$ pixel CCD Mosaic Camera at the 4 meter Mayall telescope of Kitt Peak National Observatory. Well-detected sources with flux and equivalent width matching known high redshift Lyman-$\\alpha$ galaxies have an observed surface density corresponding to $11000 \\pm 700$ per square degree per unit redshift at $z=4.5$. Early spectroscopic followup from the Keck telescope suggests that $\\sim 1/3$ of these are actually at $z\\approx 4.5$, and has confirmed five $z > 4$ Lyman-$\\alpha$ emitters so far. Combining our photometric survey with spectroscopic results, we estimate a net density of $\\sim 4000 $ Lyman-$\\alpha$ emitters per square degree per unit redshift at $z\\approx 4.5$. The star formation rate density (estimated both from UV continuum and from line emission) is comparable to that of the Lyman break galaxy population within present uncertainties. The most extreme Lyman-$\\alpha$ emitters in our sample have rest frame equivalent widths $> 100\\AA$, consistent with the expectations for the first burst of star formation in a primitive, dust-free galaxy.

James E. Rhoads; Sangeeta Malhotra; Arjun Dey; Buell T. Jannuzi; Daniel Stern; Hyron Spinrad

2001-04-18T23:59:59.000Z

207

Reheating induced by competing decay modes  

SciTech Connect

We address the problem of studying the decay of the inflaton field {phi} to another scalar field {chi} through parametric resonance in the case of a coupling that involves several decay modes. This amounts to the presence of extra harmonic terms in the perturbation of the {chi} field dynamics. For the case of two frequencies we compute the geometry of the resonance regions, which is significantly altered due to the presence of noncuspidal resonance regions associated to higher harmonics and to the emergence of instability 'pockets'. We discuss the effect of this change in the efficiency of the energy transfer process for the simplest case of a coupling given by a combination of the two interaction terms of homogeneous degree usually considered in the literature. We find that the presence of higher harmonics has limited cosmological implications.

Charters, T. [Departamento de Engenharia Mecanica/Area Cientifica de Matematica, Instituto Superior de Engenharia de Lisboa, Rua Conselheiro Emidio Navarro, 1, P-1949-014 Lisbon, Portugal and Centro de Fisica Teorica e Computacional da Universidade de Lisboa, Avenida Professor Gama Pinto 2, P-1649-003 Lisbon (Portugal); Nunes, A.; Mimoso, J. P. [Departamento de Fisica, Faculdade de Ciencias da Universidade de Lisboa, Centro de Fisica Teorica e Computacional da Universidade de Lisboa, Avenida Professor Gama Pinto 2, P-1649-003 Lisbon (Portugal)

2008-10-15T23:59:59.000Z

208

Use of MCNPX for Alpha Spectrometry Simulations of a Continuous Air Monitor  

Science Conference Proceedings (OSTI)

The purpose of this study was to determine if the alpha energy spectrum in a Passive Implanted Planar Silicon (PIPS) detector, as modeled by MCNPX [1], can be used to design a radon stripping algorithm for a continuous air monitor (CAM). This stripping algorithm would be employed to discriminate naturally occurring radioisotopes from the anthropogenic for nuclear safety -related applications. It is hoped that using an algorithm based on MCNPX simulations, the CAM will not be prone to false alarms when radon levels are dynamic as identified in other CAM systems [2,3]. This work is focused on the design of the next generation air particulate detector (NGAPD) for the United States Navy. The primary isotope of interest is Co-60. This radionuclide emits a beta with an average energy of 96 keV. Therefore, once deposited on the CAM filter, it will produce a beta continuum seen by the PIPS detector. In addition, as radon progeny is deposited on the air filter, these will give rise to characteristic alpha peaks and a beta continuum. This is primarily an issue in port-or land-based applications. Ultimately, measurement of a radon alpha spectrum is desired to predict the amount of beta activity which would be measured from the radon progeny decay chains. All excess beta activity could then be attributed to anthropogenic sources once the radon progeny contributions have been stripped out.

Robert Hayes, Craig Marianno

2007-01-01T23:59:59.000Z

209

Ionization and scintillation response of high-pressure xenon gas to alpha particles  

E-Print Network (OSTI)

High-pressure xenon gas is an attractive detection medium for a variety of applications in fundamental and applied physics. In this paper we study the ionization and scintillation detection properties of xenon gas at 10 bar pressure. For this purpose, we use a source of alpha particles in the NEXT-DEMO time projection chamber, the large scale prototype of the NEXT-100 neutrinoless double beta decay experiment, in three different drift electric field configurations. We measure the ionization electron drift velocity and longitudinal diffusion, and compare our results to expectations based on available electron scattering cross sections on pure xenon. In addition, two types of measurements addressing the connection between the ionization and scintillation yields are performed. On the one hand we observe, for the first time in xenon gas, large event-by-event correlated fluctuations between the ionization and scintillation signals, similar to that already observed in liquid xenon. On the other hand, we study the field dependence of the average scintillation and ionization yields. Both types of measurements may shed light on the mechanism of electron-ion recombination in xenon gas for highly-ionizing particles. Finally, by comparing the response of alpha particles and electrons in NEXT-DEMO, we find no evidence for quenching of the primary scintillation light produced by alpha particles in the xenon gas.

NEXT Collaboration; V. lvarez; F. I. G. M. Borges; S. Crcel; S. Cebrin; A. Cervera; C. A. N. Conde; T. Dafni; J. Daz; M. Egorov; R. Esteve; P. Evtoukhovitch; L. M. P. Fernandes; P. Ferrario; A. L. Ferreira; E. D. C. Freitas; V. M. Gehman; A. Gil; A. Goldschmidt; H. Gmez; J. J. Gmez-Cadenas; D. Gonzlez-Daz; R. M. Gutirrez; J. Hauptman; J. A. Hernando Morata; D. C. Herrera; I. G. Irastorza; M. A. Jinete; L. Labarga; A. Laing; I. Liubarsky; J. A. M. Lopes; D. Lorca; M. Losada; G. Luzn; A. Mar; J. Martn-Albo; T. Miller; A. Moiseenko; F. Monrabal; C. M. B. Monteiro; F. J. Mora; L. M. Moutinho; J. Muoz Vidal; H. Natal da Luz; G. Navarro; M. Nebot-Guinot; D. Nygren; C. A. B. Oliveira; R. Palma; J. Prez; J. L. Prez Aparicio; J. Renner; L. Ripoll; A. Rodrguez; J. Rodrguez; F. P. Santos; J. M. F. dos Santos; L. Segui; L. Serra; D. Shuman; A. Simn; C. Sofka; M. Sorel; J. F. Toledo; A. Toms; J. Torrent; Z. Tsamalaidze; D. Vzquez; J. F. C. A. Veloso; R. Webb; J. T White; N. Yahlali

2012-11-19T23:59:59.000Z

210

Alpha Channeling in Rotating Plasma with Stationary Waves  

SciTech Connect

An extension of the alpha channeling effect to supersonically rotating mirrors shows that the rotation itself can be driven using alpha particle energy. Alpha channeling uses radiofrequency waves to remove alpha particles collisionlessly at low energy. We show that stationary magnetic fields with high n? can be used for this purpose, and simulations show that a large fraction of the alpha energy can be converted to rotation energy.

A. Fetterman and N.J. Fisch

2010-02-15T23:59:59.000Z

211

Time reversal invariance in polarized neutron decay  

SciTech Connect

An experiment to measure the time reversal invariance violating (T-violating) triple correlation (D) in the decay of free polarized neutrons has been developed. The detector design incorporates a detector geometry that provides a significant improvement in the sensitivity over that used in the most sensitive of previous experiments. A prototype detector was tested in measurements with a cold neutron beam. Data resulting from the tests are presented. A detailed calculation of systematic effects has been performed and new diagnostic techniques that allow these effects to be measured have been developed. As the result of this work, a new experiment is under way that will improve the sensitivity to D to 3 {times} 10{sup {minus}4} or better. With higher neutron flux a statistical sensitivity of the order 3 {times} 10{sup {minus}5} is ultimately expected. The decay of free polarized neutrons (n {yields} p + e + {bar v}{sub e}) is used to search for T-violation by measuring the triple correlation of the neutron spin polarization, and the electron and proton momenta ({sigma}{sub n} {center_dot} p{sub p} {times} p{sub e}). This correlation changes sign under reversal of the motion. Since final state effects in neutron decay are small, a nonzero coefficient, D, of this correlation indicates the violation of time reversal invariance. D is measured by comparing the numbers of coincidences in electron and proton detectors arranged symmetrically about a longitudinally polarized neutron beam. Particular care must be taken to eliminate residual asymmetries in the detectors or beam as these can lead to significant false effects. The Standard Model predicts negligible T-violating effects in neutron decay. Extensions to the Standard Model include new interactions some of which include CP-violating components. Some of these make first order contributions to D.

Wasserman, E.G.

1994-03-01T23:59:59.000Z

212

Nuclear decay data for selected radionuclides  

SciTech Connect

Contained in this report are tabulations of the atomic and nuclear radiations emitted by 194 radioactive nuclides. The nuclei included comprise most of those currently of interest in medical practice or research, health physics, industry, nuclear power, environmental impact studies, and as reference standards. Listed in tabular form are recommended values for half-lives, energies, intensities (probabilities per decay), and equilibrium absorbed-dose constants for each of the atomic and nuclear radiations emitted by these radioactive atoms. (auth)

Martin, M.J. (ed.)

1976-03-01T23:59:59.000Z

213

Proton decay matrix elements from lattice QCD  

Science Conference Proceedings (OSTI)

We report on the calculation of the matrix elements of nucleon to pseudoscalar decay through a three quark operator, a part of the low-energy, four-fermion, baryon-number-violating operator originating from grand unified theories. The direct calculation of the form factors using domain-wall fermions on the lattice, incorporating the u, d and s sea-quarks effects yields the results with all the relevant systematic uncertainties controlled for the first time.

Aoki, Yasumichi; Shintani, Eigo [Kobayashi-Maskawa Institute for the Origin of Particles and the Universe (KMI), Nagoya University, Nagoya 464-8602 (Japan); RIKEN-BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973 (United States); Collaboration: RBC Collaboration; UKQCD Collaboration

2012-07-27T23:59:59.000Z

214

The study of synchronous (by local time) changes of the statistical properties of thermal noise and alpha-activity fluctuations of a 239-Pu sample  

E-Print Network (OSTI)

Experimentally obtained and analyzed fine structure of statistical distributions for two physically independent processes: alpha-decay rate fluctuations of Pu-239 sample in Pushchino (Moscow region, Russia) and equilibrium voltage fluctuations (Johnson noise) from metal-film resistor in Tbilisi (Georgia). Special investigation of histograms shape similarity in these processes demonstrated majority of previously studied effects, called - macroscopic fluctuations. Offered qualitative model of the observed effects.

A. V. Kaminsky; S. E. Shnoll

2006-05-06T23:59:59.000Z

215

Review on the determination of alpha_s from the QCD static energy  

E-Print Network (OSTI)

We review the determination of the strong coupling alpha_s from the comparison of the perturbative expression for the Quantum Chromodynamics static energy with lattice data. We collect here all the perturbative expressions needed to evaluate the static energy at the currently known accuracy.

Tormo, Xavier Garcia i

2013-01-01T23:59:59.000Z

216

A background free double beta decay experiment  

E-Print Network (OSTI)

We present a new detection scheme for rejecting backgrounds in neutrino less double beta decay experiments. It relies on the detection of Cherenkov light emitted by electrons in the MeV region. The momentum threshold is tuned to reach a good discrimination between background and good events. We consider many detector concepts and a range of target materials. The most promising is a high-pressure 136Xe emitter for which the required energy threshold is easily adjusted. Combination of this concept and a high pressure Time Projection Chamber could provide an optimal solution. A simple and low cost effective solution is to use the Spherical Proportional Counter that provides two delayed signals from ionization and Cherenkov light. In solid-state double beta decay emitters, because of their higher density, the considered process is out of energy range. An alternative solution could be the development of double decay emitters with lower density by using for instance the aerogel technique. It is surprising that a technology used for particle identification in high-energy physics becomes a powerful tool for rejecting backgrounds in such low-energy experiments.

Ioannis Giomataris

2010-12-20T23:59:59.000Z

217

Search for Exclusive Charmless Hadronic B Decays  

E-Print Network (OSTI)

We have searched for several two-body charmless hadronic decays of B mesons. These final states include K and with both charged and neutral kaons and pions; K , Kae, and ae; and OEX s , where X s = K; K , or OE. The data used in this analysis consist of 2:0 fb \\Gamma1 taken on the \\Upsilon(4S ) with the CLEO-II detector at the Cornell Electron Storage Ring (CESR). This data set includes 2.2 million BB pairs, allowing us to place upper limits on these branching ratios in the range from 10 \\Gamma4 to 10 \\Gamma5 . Permanent address: University of Hawaii at Manoa y Permanent address: INP, Novosibirsk, Russia 2 I. INTRODUCTION The decays of B-mesons to two charmless hadrons can proceed via a b ! u tree-level spectator diagram (Figure 1a), or via a b ! sg one-loop "penguin-diagram" (Figure 1b) and to a lesser extent, via the CKM-suppressed b ! dg penguin diagram. Although rare decays can also proceed via b ! u internal, color-suppressed diagrams (Figure 1c), b ! u exch...

Gronberg Kutschke Menary; Ichep Ref; Gsl Cleo Conf; Search Exclusive; Charmless Hadronic; B Decays; S. Menary; S. Nakanishi; C. Qiao

1994-01-01T23:59:59.000Z

218

D meson hadronic decays at CLEO-c  

SciTech Connect

The recent CLEO-c results on hadronic decays of D and D{sub s} mesons are presented. First the absolute branching fractions for D and D{sub s} mesons using a double tag technique are discussed, then are the Cabibbo suppressed decays and doubly Cabibbo suppressed decays. Finally, I present the inclusive and rare decay modes and other measurements from CLEO-c. These decays illuminate a wide range of physics. A brief theoretical introduction is given before the corresponding discussion on measurement.

Yang, Fan; /Fermilab

2011-01-01T23:59:59.000Z

219

Suppression of Exponential Electronic Decay in a Charged Environment  

Science Conference Proceedings (OSTI)

Inner-shell ionization of atoms and molecules leads to the creation of highly excited ionic states that often decay by electron emission. The dynamics of the decay is usually assumed to be exponential and the process is characterized by a decay rate. Here we show that in a multiply ionized cluster created by interaction with a high-intensity free-electron laser (FEL) radiation, trapping of the emitted electron by the neighboring ions changes the character of the decay dynamics qualitatively to the extent that it can become oscillatory instead of exponential. Implications of the predicted effect on Coster-Kronig and interatomic Coulombic decay processes induced by FELs are investigated.

Averbukh, Vitali [Max Planck Institute for the Physics of Complex Systems, Noethnitzer Strasse 38, D-01187 Dresden (Germany); Saalmann, Ulf; Rost, Jan Michael [Max Planck Institute for the Physics of Complex Systems, Noethnitzer Strasse 38, D-01187 Dresden (Germany); Max Planck Advanced Study Group at the Center for Free-Electron Laser Science, Luruper Chaussee 149, 22761 Hamburg (Germany)

2010-06-11T23:59:59.000Z

220

ALPHA ATTENUATION DUE TO DUST LOADING  

SciTech Connect

Previous studies had been done in order to show the attenuation of alpha particles in filter media. These studies provided an accurate correction for this attenuation, but there had not yet been a study with sufficient results to properly correct for attenuation due to dust loading on the filters. At the Savannah River Site, filter samples are corrected for attenuation due to dust loading at 20%. Depending on the facility the filter comes from and the duration of the sampling period, the proper correction factor may vary. The objective of this study was to determine self-absorption curves for each of three counting instruments. Prior work indicated significant decreases in alpha count rate (as much as 38%) due to dust loading, especially on filters from facilities where sampling takes place over long intervals. The alpha count rate decreased because of a decrease in the energy of the alpha. The study performed resulted in a set of alpha absorption curves for each of three detectors. This study also took into account the affects of the geometry differences in the different counting equipment used.

Dailey, A; Dennis Hadlock, D

2007-08-09T23:59:59.000Z

Note: This page contains sample records for the topic "alpha decay suspected" from the National Library of EnergyBeta (NLEBeta).
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they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

The Large Area Lyman Alpha Survey  

E-Print Network (OSTI)

The Lyman-$\\alpha$ line is expected to be strong in the presence of active star formation and the absence of dust, making it a good tool for finding chemically primitive galaxies in the early universe. We report on a new survey for high redshift Lyman-$\\alpha$ sources, the Large Area Lyman Alpha (LALA) survey. Our survey achieves an unprecedented combination of volume and sensitivity by using narrow-band filters on the new $8192^2$ pixel CCD Mosaic Camera at the 4 meter Mayall telescope of Kitt Peak National Observatory. Well-detected sources with flux and equivalent width matching known high redshift Lyman-$\\alpha$ galaxies have an observed surface density corresponding to $11000 \\pm 700$ per square degree per unit redshift at $z=4.5$. Early spectroscopic followup from the Keck telescope suggests that $\\sim 1/3$ of these are actually at $z\\approx 4.5$, and has confirmed five $z > 4$ Lyman-$\\alpha$ emitters so far. Combining our photometric survey with spectroscopic results, we estimate a net density of $\\sim...

Rhoads, J E; Dey, A; Jannuzi, B T; Stern, D; Spinrad, H; Rhoads, James E.; Malhotra, Sangeeta; Dey, Arjun; Jannuzi, Buell T.; Stern, Daniel

2001-01-01T23:59:59.000Z

222

Lyman-alpha Emission from Structure Formation  

E-Print Network (OSTI)

The nature of the interaction between galaxies and the intergalactic medium (IGM) is one of the most fundamental problems in astrophysics. The accretion of gas onto galaxies provides fuel for star formation, while galactic winds transform the nearby IGM in a number of ways. One exciting technique to study this gas is through the imaging of hydrogen Lyman-alpha emission. We use cosmological simulations to study the Lyman-alpha signals expected from the growth of cosmic structure from z=0-5. We show that if dust absorption is negligible, recombinations following the absorption of stellar ionizing photons dominate the total Lyman-alpha photon production rate. However, galaxies are also surrounded by "Lyman-alpha coronae" of diffuse IGM gas. These coronae are composed of a combination of accreting gas and material ejected from the central galaxy by winds. The Lyman-alpha emission from this phase is powered by a combination of gravitational processes and the photoionizing background. While the former dominates at ...

Furlanetto, S; Springel, V; Hernquist, L; Furlanetto, Steven; Schaye, Joop; Springel, Volker; Hernquist, Lars

2004-01-01T23:59:59.000Z

223

The Particle Adventure | Particle decays and annihiliations | Neutron beta  

NLE Websites -- All DOE Office Websites (Extended Search)

Particle decays and annihiliations > Neutron beta Particle decays and annihiliations > Neutron beta decays Neutron beta decays A neutron (udd) decays to a proton (uud), an electron, and an antineutrino. This is called neutron beta decay. (The term beta ray was used for electrons in nuclear decays because they didn't know they were electrons!) Frame 1: The neutron (charge = 0) made of up, down, down quarks. Frame 2: One of the down quarks is transformed into an up quark. Since the down quark has a charge of -1/3 and and the up quark has a charge of 2/3, it follows that this process is mediated by a virtual W- particle, which carries away a (-1) charge (thus charge is conserved!) Frame 3: The new up quark rebounds away from the emitted W-. The neutron now has become a proton. Frame 4: An electron and antineutrino emerge from the virtual W- boson.

224

AlphaWatt Ltd | Open Energy Information  

Open Energy Info (EERE)

AlphaWatt Ltd AlphaWatt Ltd Jump to: navigation, search Name AlphaWatt Ltd Place London, United Kingdom Zip EC1V 4PY Sector Solar Product Solar project developer, plans to become an independent power provider. Coordinates 51.506325°, -0.127144° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":51.506325,"lon":-0.127144,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

225

Alternating current long range alpha particle detector  

DOE Patents (OSTI)

An alpha particle detector, utilizing alternating currents, which is capable of detecting alpha particles from distinct sources. The use of alternating currents allows use of simpler ac circuits which, in turn, are not susceptible to dc error components. It also allows the benefit of gas gain, if desired. In the invention, a voltage source creates an electric field between two conductive grids, and between the grids and a conductive enclosure. Air containing air ions created by collision with alpha particles is drawn into the enclosure and detected. In some embodiments, the air flow into the enclosure is interrupted, creating an alternating flow of ions. In another embodiment, a modulated voltage is applied to the grid, also modulating the detection of ions.

MacArthur, D.W.; McAtee, J.L.

1993-02-16T23:59:59.000Z

226

Report a Suspected Crime  

NLE Websites -- All DOE Office Websites (Extended Search)

state, cross-street, andor milepost) Identification of Person(s) (For example, race, gender, approximate age, height, weight, build, hair colorlength, tattoos, clothing, and...

227

Experimental Investigation of Weak Non-Mesonic Decay of 10Be(Lambda)Hypernuclei at CEBAF  

E-Print Network (OSTI)

Hypernuclei are convenient laboratory to study the baryon-baryon weak interaction and associated effective Hamiltonian. The strangeness changing process, in which a Lambda hyperon converts to a neutron with a release up to 176 MeV, provides a clear signal for a conversion of an s-quark to a d-quark. We propose to perform a non-mesonic weak decay study of 10Be(Lambda)hypernuclei using the (e,eK) reaction. These investigations will fully utilize the unique parameters of the CEBAF CW electron beam and RF system and are enabled by (1) the use of new detector for alpha particles based on the recently developed RF timing technique with picosecond resolution and (2) the small angle and large acceptance kaon spectrometer-HKS in Hall C.

S. Majewski; L. Majling; A. Margaryan; L. Tang

2005-08-05T23:59:59.000Z

228

Deficit of reactor antineutrinos at distances smaller than 100 m and inverse beta-decay  

E-Print Network (OSTI)

We analyse a change of a deficit of reactor antineutrinos at distances smaller than 100 m by changing the lifetime of the neutron from tau_n = 885.7 s to tau_n = 879.6 s, calculated for the axial coupling constants lambda = - 1.2694 and lambda = - 1.2750, respectively, in order to get a result corresponding the new world average value tau_n = 880.1(1.1) s. We calculate the angular distribution and cross section for the inverse beta-decay, taking into account the contributions of the "weak magnetism" and the neutron recoil to next-to-leading order in the large baryon mass expansion and the radiative corrections of order alpha/\\pi ~ 10^(-3), calculated to leading order in the large baryon mass expansion. We obtain an increase of a deficit of reactor antineutrinos in of about 0.734%.

A. N. Ivanov; R. Hollwieser; N. I. Troitskaya; M. Wellenzohn; O. M. Zherebtsov; A. P. Serebrov

2013-06-09T23:59:59.000Z

229

Lyman-alpha Emission from Structure Formation  

E-Print Network (OSTI)

The nature of the interaction between galaxies and the intergalactic medium (IGM) is one of the most fundamental problems in astrophysics. The accretion of gas onto galaxies provides fuel for star formation, while galactic winds transform the nearby IGM in a number of ways. One exciting technique to study this gas is through the imaging of hydrogen Lyman-alpha emission. We use cosmological simulations to study the Lyman-alpha signals expected from the growth of cosmic structure from z=0-5. We show that if dust absorption is negligible, recombinations following the absorption of stellar ionizing photons dominate the total Lyman-alpha photon production rate. However, galaxies are also surrounded by "Lyman-alpha coronae" of diffuse IGM gas. These coronae are composed of a combination of accreting gas and material ejected from the central galaxy by winds. The Lyman-alpha emission from this phase is powered by a combination of gravitational processes and the photoionizing background. While the former dominates at z~0, collisional excitation following photo-heating may well dominate the total emission at higher redshifts. The central regions of these systems are dense enough to shield themselves from the metagalactic ionizing background; unfortunately, in this regime our simulations are no longer reliable. We therefore consider several scenarios for the emission from the central cores, including one in which self-shielded gas does not emit at all. We show that the combination of star formation and cooling IGM gas can explain most of the observed "Lyman-alpha blobs" at z~3, with the important exception of the largest sources. On the other hand, except under the most optimistic assumptions, cooling IGM gas cannot explain the observations on its own.

Steven Furlanetto; Joop Schaye; Volker Springel; Lars Hernquist

2004-09-29T23:59:59.000Z

230

Search for Charged Higgs Boson Decays of the Top Quark Using Hadronic tau Decays  

SciTech Connect

We present the result of a search for charged Higgs boson decays of the top quark, produced in p{bar p} collisions at {radical}s = 1.8 TeV. When the charged Higgs boson is heavy and decays to a {tau} lepton, which subsequently decays hadronically, the resulting events have a unique signature: large missing transverse energy and the low-charged-multiplicity {tau}. Data collected in 1992 and 1993 at the Collider Detector at Fermilab, corresponding to 18.7 {+-} 0.7 pb{sup -1}, exclude new regions of combined top quark and charged Higgs boson mass, in extensions to the standard model with two Higgs doublets.

Abe, F.

1996-01-01T23:59:59.000Z

231

Fan-less long range alpha detector  

DOE Patents (OSTI)

A fan-less long range alpha detector which operates by using an electrical field between a signal plane and the surface or substance to be monitored for air ions created by collisions with alpha radiation. Without a fan, the detector can operate without the possibility of spreading dust and potential contamination into the atmosphere. A guard plane between the signal plane and the electrically conductive enclosure and maintained at the same voltage as the signal plane, reduces leakage currents. The detector can easily monitor soil, or other solid or liquid surfaces.

MacArthur, Duncan W. (Los Alamos, NM); Bounds, John A. (Los Alamos, NM)

1994-01-01T23:59:59.000Z

232

Fan-less long range alpha detector  

DOE Patents (OSTI)

A fan-less long range alpha detector is disclosed which operates by using an electrical field between a signal plane and the surface or substance to be monitored for air ions created by collisions with alpha radiation. Without a fan, the detector can operate without the possibility of spreading dust and potential contamination into the atmosphere. A guard plane between the signal plane and the electrically conductive enclosure and maintained at the same voltage as the signal plane, reduces leakage currents. The detector can easily monitor soil, or other solid or liquid surfaces. 2 figures.

MacArthur, D.W.; Bounds, J.A.

1994-05-10T23:59:59.000Z

233

An Ion Guide for the Production of a Low Energy Ion Beam of Daughter Products of $\\alpha$-Emitters  

E-Print Network (OSTI)

A new ion guide has been modeled and tested for the production of a low energy ($\\approx$ 40 kV) ion beam of daughter products of alpha-emitting isotopes. The guide is designed to evacuate daughter recoils originating from the $\\alpha$-decay of a $^{233}$U source. The source is electroplated onto stainless steel strips and mounted along the inner walls of an ion guide chamber. A combination of electric fields and helium gas flow transport the ions through an exit hole for injection into a mass separator. Ion guide efficiencies for the extraction of $^{229}$Th$^{+}$ (0.06%), $^{221}$Fr$^{+}$ (6%), and $^{217}$At$^{+}$ (6%) beams have been measured. A detailed study of the electric field and gas flow influence on the ion guide efficiency is described for two differing electric field configurations.

Tordoff, B; Elomaa, V V; Gulick, S; Hager, U; Karvonen, P; Kessler, T; Lee, J; Moore, I; Popov, A; Rahaman, S; Rinta-Antila, S; Sonoda, T; yst, J

2006-01-01T23:59:59.000Z

234

Detection of Alpha Particles and Low Energy Gamma Rays by Thermo-Bonded Micromegas in Xenon Gas  

E-Print Network (OSTI)

Micromegas is a type of micro-pattern gaseous detector currently under R&D for applications in rare event search experiments. Here we report the performance of a Micromegas structure constructed with a micromesh thermo-bonded to a readout plane, motivated by its potential application in two-phase xenon detectors for dark matter and neutrinoless double beta decay experiments. The study is carried out in pure xenon at room temperature. Measurements with alpha particles from the Americium-241 source showed that gas gains larger than 200 can be obtained at xenon pressure up to 3 atm. Gamma rays down to 8 keV were observed with such a device.

Yuehuan Wei; Liang Guan; Zhiyong Zhang; Qing Lin; Xiaolian Wang; Kaixuan Ni; Tianchi Zhao

2013-08-09T23:59:59.000Z

235

Engineering aspects of disruption current decay  

SciTech Connect

Engineering features associated with the configuration of a tokamak can affect the amount of energy that produces melting and damage to the limiters or internal wall surfaces as the result of a major disruption. During the current decay period of a major thermal disruption, the energy that can damage a wall or limiter comes from the external magnetic field. By providing a good conducting torus near the plasma and increasing the plasma circuit resistance, this magnetic energy (transferred by way of the plasma circuit) can be minimized. This report addresses engineering design features to reduce the energy deposited on the inner torus surface that produces melting of the structures.

Murray, J.G.

1983-11-01T23:59:59.000Z

236

Transformer Recharging with Alpha Channeling in Tokamaks  

SciTech Connect

Transformer recharging with lower hybrid waves in tokamaks can give low average auxiliary power if the resistivity is kept high enough during the radio frequency (rf) recharging stage. At the same time, operation in the hot ion mode via alpha channeling increases the effective fusion reactivity. This paper will address the extent to which these two large cost saving steps are compatible. __________________________________________________

N.J. Fisch

2009-12-21T23:59:59.000Z

237

Temperature Sensitivity of Lyman-Alpha Hygrometers  

Science Conference Proceedings (OSTI)

The response of an E.R.C. Lyman-alpha hygrometer to humidity and temperature variations has been experimentally determined in a humidity calibration tunnel. The data are compared to a simple two-gas/two-line model to determine the errors made in ...

P. Mestayer; C. Rebattet

1985-12-01T23:59:59.000Z

238

The measurement of $\\alpha_s$ from event shapes with the DELPHI detector at the highest LEP energies  

E-Print Network (OSTI)

Hadronic event shape distributions are determined from data in e+e- collisions between 183 and 207 GeV. From these the strong coupling alpha_s is extracted in O(alpha_s^2), NLLA and matched O(alpha_s^2)+NLLA theory. Hadronisation corrections evaluated with fragmentation model generators as well as an analytical power ansatz are applied. Comparing these measurements to those obtained at and around M_Z allows a combined measurement of alpha_s from all DELPHI data and a test of the energy dependence of the strong coupling.

Abdallah, J; Adam, W; Adzic, P; Albrecht, T; Alderweireld, T; Alemany-Fernandez, R; Allmendinger, T; Allport, P P; Amaldi, Ugo; Amapane, N; Amato, S; Anashkin, E; Andreazza, A; Andringa, S; Anjos, N; Antilogus, P; Apel, W D; Arnoud, Y; Ask, S; sman, B; Augustin, J E; Augustinus, A; Baillon, Paul; Ballestrero, A; Bambade, P; Barbier, R; Bardin, Dimitri Yuri; Barker, G; Baroncelli, A; Battaglia, Marco; Baubillier, M; Becks, K H; Begalli, M; Behrmann, A; Ben-Haim, E; Benekos, N C; Benvenuti, Alberto C; Brat, C; Berggren, M; Berntzon, L; Bertrand, D; Besanon, M; Besson, N; Bloch, D; Blom, M; Bluj, M; Bonesini, M; Boonekamp, M; Booth, P S L; Borisov, G; Botner, O; Bouquet, B; Bowcock, T J V; Boyko, I; Bracko, M; Brenner, R; Brodet, E; Brckman, P; Brunet, J M; Bugge, L; Buschmann, P; Calvi, M; Camporesi, T; Canale, V; Carena, F; Castro, N; Cavallo, F R; Chapkin, M M; Charpentier, P; Checchia, P; Chierici, R; Shlyapnikov, P; Chudoba, J; Chung, S U; Cieslik, K; Collins, P; Contri, R; Cosme, G; Cossutti, F; Costa, M J; Crennell, D J; Cuevas-Maestro, J; D'Hondt, J; Dalmau, J; Da Silva, T; Da Silva, W; Della Ricca, G; De Angelis, A; de Boer, Wim; De Clercq, C; De Lotto, B; De Maria, N; De Min, A; De Paula, L S; Di Ciaccio, Lucia; Di Simone, A; Doroba, K; Drees, J; Dris, M; Eigen, G; Ekelf, T J C; Ellert, M; Elsing, M; Espirito-Santo, M C; Fanourakis, G K; Fassouliotis, D; Feindt, M; Fernndez, J; Ferrer, A; Ferro, F; Flagmeyer, U; Fth, H; Fokitis, E; Fulda-Quenzer, F; Fuster, J A; Gandelman, M; Garca, C; Gavillet, P; Gazis, E N; Gokieli, R; Golob, B; Gmez-Ceballos, G; Gonalves, P; Graziani, E; Grosdidier, G; Grzelak, K; Guy, J; Haag, C; Hallgren, A; Hamacher, K; Hamilton, K; Haug, S; Hauler, F; Hedberg, V; Hennecke, M; Herr, H; Hoffman, J; Holmgren, S O; Holt, P J; Houlden, M A; Hultqvist, K; Jackson, J N; Jarlskog, G; Jarry, P; Jeans, D; Johansson, E K; Johansson, P D; Jonsson, P; Joram, C; Jungermann, L; Kapusta, F; Katsanevas, S; Katsoufis, E C; Kernel, G; Kersevan, Borut P; Kerzel, U; Kiiskinen, A P; King, B T; Kjaer, N J; Kluit, P; Kokkinias, P; Kourkoumelis, C; Kuznetsov, O; Krumshtein, Z; Kucharczyk, M; Lamsa, J; Leder, G; Ledroit, F; Leinonen, L; Leitner, R; Lemonne, J; Lepeltier, V; Lesiak, T; Liebig, W; Liko, D; Lipniacka, A; Lopes, J H; Lpez, J M; Loukas, D; Lutz, P; Lyons, L; MacNaughton, J; Malek, A; Maltezos, S; Mandl, F; Marco, J; Marco, R; Marchal, B; Margoni, M; Marin, J C; Mariotti, C; Markou, A; Martnez-Rivero, C; Masik, J; Mastroyiannopoulos, N; Matorras, F; Matteuzzi, C; Mazzucato, F; Mazzucato, M; McNulty, R; Meroni, C; Migliore, E; Mitaroff, W A; Mjrnmark, U; Moa, T; Moch, M; Mnig, K; Monge, R; Montenegro, J; Moraes, D; Moreno, S; Morettini, P; Mller, U; Mnich, K; Mulders, M; Mundim, L M; Murray, W; Muryn, B; Myatt, Gerald; Myklebust, T; Nassiakou, M; Navarria, Francesco Luigi; Nawrocki, K; Nicolaidou, R; Nikolenko, M; Oblakowska-Mucha, A; Obraztsov, V F; Olshevskii, A G; Onofre, A; Orava, Risto; sterberg, K; Ouraou, A; Oyanguren, A; Paganoni, M; Paiano, S; Palacios, J P; Palka, H; Papadopoulou, T D; Pape, L; Parkes, C; Parodi, F; Parzefall, U; Passeri, A; Passon, O; Peralta, L; Perepelitsa, V F; Perrotta, A; Petrolini, A; Piedra, J; Pieri, L; Pierre, F; Pimenta, M; Piotto, E; Podobnik, T; Poireau, V; Pol, M E; Polok, G; Poropat, P; Pozdnyakov, V; Pukhaeva, N; Pullia, Antonio; Rames, J; Ramler, L; Read, A; Rebecchi, P; Rehn, J; Reid, D; Reinhardt, R; Renton, P B; Richard, F; Rdky, J; Rivero, M; Rodrguez, D; Romero, A; Ronchese, P; Roudeau, Patrick; Rovelli, T; Ruhlmann-Kleider, V; Ryabtchikov, D; Sadovskii, A; Salmi, L; Salt, J; Savoy-Navarro, A; Schwickerath, U; Segar, A; Sekulin, R L; Siebel, M; Sissakian, A N; Smadja, G; Smirnova, O G; Sokolov, A; Sopczak, A; Sosnowski, R; Spassoff, Tz; Stanitzki, M; Stocchi, A; Strauss, J; Stugu, B; Szczekowski, M; Szeptycka, M; Szumlak, T; Tabarelli de Fatis, T; Taffard, A C; Tegenfeldt, F; Timmermans, J; Tkatchev, L G; Tobin, M; Todorovova, S; Tom, B; Tonazzo, A; Tortosa, P; Travnicek, P; Treille, D; Tristram, G; Trochimczuk, M; Troncon, C; Turluer, M L; Tyapkin, I A; Tyapkin, P; Tzamarias, S; Uvarov, V; Valenti, G; van Dam, P; Van Eldik, J; Van Lysebetten, A; Van Remortel, N; Van Vulpen, I B; Vegni, G; Veloso, F; Venus, W A; Verdier, P; Verzi, V; Vilanova, D; Vitale, L; Vrba, V; Wahlen, H; Washbrook, A J; Weiser, C; Wicke, D; Wickens, J H; Wilkinson, G; Winter, M; Witek, M; Yushchenko, O P; Zalewska-Bak, A; Zalewski, Piotr; Zavrtanik, D; Zhuravlov, V; Zimin, N I; Zinchenko, A I; Zupan, M

2004-01-01T23:59:59.000Z

239

Decaying Higgs Fields and Cosmological Dark Energy  

E-Print Network (OSTI)

The observed dark energy in the universe might give particles inertial mass. We investigate one realization of this idea, that the dark energy field might be a decayed scalar component of a supermultiplet field in the early universe that creates inertial mass through spontaneous symmetry breaking, e.g. a Higgs field. To investigate this possibility, the cosmological Friedmann equation of energy balance is augmented in a standard way to incorporate a minimally coupled cosmological Higgs. For epochs where the expansion of the universe is driven by matter and radiation and not the scalar field, the observed hidden nature of the Higgs field can be codified into a single differential equation that we call the "hidden higgs" condition. The resulting differential equation is solved for the time dependant scalar field and a simple and interesting solution is found analytically. Such a Higgs field decays from Planck scale energies rapidly and approximately exponentially from onset, leaving only the initially negligible constant term of the potential as a final cosmological constant. Such evolution replaces the hierarchy problem with the problem of explaining why such evolution is physically justified.

Robert J. Nemiroff; Bijunath Patla

2004-09-27T23:59:59.000Z

240

Proton decay matrix elements on the lattice  

E-Print Network (OSTI)

Hadronic matrix elements of proton decay are essential ingredients to bridge the grand unification theory to low energy observables like proton lifetime. In this paper we non-perturbatively calculate the matrix elements, relevant for the process of a nucleon decaying into a pseudoscalar meson and an anti-lepton through generic baryon number violating four-fermi operators. Lattice QCD with 2+1 flavor dynamical domain-wall fermions with the {\\it direct} method, which is direct measurement of matrix element from three-point function without chiral perturbation theory, are used for this study to have good control over the lattice discretization error, operator renormalization, and chiral extrapolation. The relevant form factors for possible transition process from an initial proton or neutron to a final pion or kaon induced by all types of three quark operators are obtained through three-point functions of (nucleon)-(three-quark operator)-(meson) with physical kinematics. In this study all the relevant systematic uncertainties of the form factors are taken into account for the first time, and the total error is found to be the range 30%-40% for $\\pi$ and 20%-40% for $K$ final states.

Y. Aoki; E. Shintani; A. Soni

2013-04-28T23:59:59.000Z

Note: This page contains sample records for the topic "alpha decay suspected" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
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241

Theoretical Review on CP Violation in Rare B decays  

E-Print Network (OSTI)

We discuss several issues related to direct CP violation in rare $B$ meson decays. We review the use of CP asymmetries in extracting information of strong and weak phases, how the experimental data fit into the overall picture, and the current status of the $K \\pi$ puzzle. We also examine the flavor symmetry assumption using closely related decay modes and extract the weak phase $\\gamma$ from certain $B \\to K^* \\pi$ and $\\rho K$ decays.

Chiang, Cheng-Wei

2008-01-01T23:59:59.000Z

242

Theoretical Review on CP Violation in Rare B decays  

E-Print Network (OSTI)

We discuss several issues related to direct CP violation in rare $B$ meson decays. We review the use of CP asymmetries in extracting information of strong and weak phases, how the experimental data fit into the overall picture, and the current status of the $K \\pi$ puzzle. We also examine the flavor symmetry assumption using closely related decay modes and extract the weak phase $\\gamma$ from certain $B \\to K^* \\pi$ and $\\rho K$ decays.

Cheng-Wei Chiang

2008-08-09T23:59:59.000Z

243

Antibody-mediated reduction of .alpha.-ketoamides  

DOE Patents (OSTI)

Monoclonal antibodies raised against a 4-nitrophenyl phosphonate hapten catalyze the stereospecific reduction of an .alpha.-ketoamide to the corresponding .alpha.-hydroxyamide in the presence of an appropriate reducing agent.

Schultz, Peter G. (Oakland, CA); Gallop, Mark A. (East Palo Alto, CA)

1998-01-01T23:59:59.000Z

244

Study of alpha background in a dark matter detector  

E-Print Network (OSTI)

Alpha background, specifically from radon and its progeny in the uranium and thorium chains, has been a major issue in dark matter detectors. This work focuses on alpha background presence in the DMTPC experiment by examining ...

Yegoryan, Hayk

2010-01-01T23:59:59.000Z

245

Antibody-mediated reduction of {alpha}-ketoamides  

DOE Patents (OSTI)

Monoclonal antibodies raised against a 4-nitrophenyl phosphonate hapten catalyze the stereospecific reduction of an {alpha}-ketoamide to the corresponding {alpha}-hydroxyamide in the presence of an appropriate reducing agent.

Schultz, P.G.; Gallop, M.A.

1998-06-09T23:59:59.000Z

246

Searches for Leptonic B Decays at BaBar  

SciTech Connect

Measurements of the branching fractions of purely leptonic decays of B-mesons translate into constraints in the plane of the charged Higgs mass versus tan {beta} which are relatively insensitive to the particular theoretical model. Using the full BABAR dataset of 450 million B-decays we search for these decays. No significant signal is found in the decays into electrons or muons and we set upper limits on the branching fractions of the order of a 10{sup -6} at 90% confidence level. We measure the branching fraction of B {yields} {tau}{mu} to be (1.7 {+-} 0.6) x 10{sup -4}.

Nelson, Silke; /SLAC

2012-04-25T23:59:59.000Z

247

Physicists Challenge Reports of Accelerated Decay of Nuclear...  

NLE Websites -- All DOE Office Websites (Extended Search)

Photon Source at Argonne, appear in the August 13 edition of Physical Review Letters. Nuclear isomers include excited states of nuclei that electromagnetically decay slowly...

248

Decays of J/psi (3100) to baryon final states  

SciTech Connect

We present results for the decays of psi(3100) into baryon and hyperon final states. The sample studied here consists of 1.3 million produced psi decays. The decays into nonstrange baryons agree well with currently established results, but with better statistics. In addition, significant resonance formation in multibody final states is observed. The decay psi ..-->.. anti pp..gamma.., the first direct photon decay of the psi involving baryons in the final state, is presented and the theoretical implications of the decays are briefly explored. Several new decays of the psi involving strange baryons are explored, including the first observations of three body final states involving hyperons. The I-spin symmetry of the strong decay psi ..-->.. baryons has clearly been observed. The reduced matrix elements for psi ..-->.. B anti B are presented for final states of different SU(3) content. The B/sub 8/ anti B/sub 8/ results are in excellent agreement with the psi being an SU(3) singlet as are the results for psi ..-->.. B/sub 10/ anti B/sub 10/. We present the first evidence for the SU(3) violating decays of the type psi ..-->.. B/sub 8/ anti B/sub 10/ + c.c.. Angular distributions for psi ..-->.. B/sub 8/ anti B/sub 8/ are presented and compared with theoretical predictions. Statistics are limited, but the data tends to prefer other than a 1 + Cos/sup 2/theta distribution.

Eaton, M.W.

1982-05-01T23:59:59.000Z

249

Study of the decay $\\Lambda$sub(c) --> $\\Lambda$ l$^{+}$ $\  

E-Print Network (OSTI)

Using the CLEO II detector at CESR, we observe 500 \\Lambda l^+ pairs consistent with the semileptonic decay \\Lambda_c \\to \\Lambda l^+ \

Bergfeld, T; Gollin, G; Ong, B; Palmer, M; Selen, M; Thaler, J J; Sadoff, A J; Ammar, R; Ball, S; Baringer, P; Bean, A; Besson, D; Coppage, D; Copty, N; Davis, R; Hancock, N; Kelly, M; Kwak, N; Lam, H; Kubota, Y; Lattery, M; Nelson, J K; Patton, S; Perticone, D; Poling, R; Savinov, V; Schrenk, S; Wang, R; Alam, M S; Kim, I J; Nemati, B; O'Neill, J J; Severini, H; Sun, C R; Zoeller, M M; Crawford, G; Daubenmier, C M; Fulton, R; Fujino, D; Gan, K K; Honscheid, K; Kagan, H; Kass, R; Lee, J; Malchow, R; Morrow, F; Skovpen, Y; Sung, M; White, C; Butler, F; Fu, X; Kalbfleisch, G; Ross, W R; Skubic, P L; Snow, J; Wang, P L; Wood, M; Brown, D N; Fast, J; McIlwain, R L; Miao, T; Miller, D H; Modesitt, M; Payne, D; Shibata, E I; Shipsey, I P J; Wang, P N; Battle, M; Ernst, J; Kwon, Y; Roberts, S; Thorndike, E H; Wang, C H; Dominick, J; Lambrecht, M; Sanghera, S; Shelkov, V; Skwarnicki, T; Stroynowski, R; Volobuev, I P; Wei, G; Zadorozhny, P; Artuso, M; Goldberg, M; He, D; Horwitz, N; Kennett, R; Mountain, R; Moneti, G C; Muheim, F; Mukhin, Y; Playfer, S; Rozen, Y; Stone, S; Thulasidas, M; Vasseur, G; Zhu, G; Bartelt, J; Csorna, S E; Egyed, Z; Jain, V; Kinoshita, K; Edwards, K W; Ogg, M; Britton, D I; Hyatt, E R F; MacFarlane, D B; Patel, P M; Akerib, D S; Barish, B; Chadha, M; Chan, S; Cowen, D F; Eigen, G; Miller, J S; O'Grady, C; Urheim, J; Weinstein, A J; Acosta, D; Athanas, M; Masek, G; Paar, H P; Gronberg, J; Kutschke, R; Menary, S; Morrison, R J; Nakanishi, S; Nelson, H N; Nelson, T K; Qiao, C; Richman, J D; Ryd, A; Tajima, H; Schmidt, D; Sperka, D; Witherell, M S; Procario, M; Balest, R; Cho, K; Daoudi, M; Ford, W T; Johnson, D R; Lingel, K; Lohner, M; Rankin, P; Smith, J G; Alexander, J P; Bebek, C; Berkelman, K; Bloom, K; Browder, T E; Cassel, D G; Cho, H A; Coffman, D M; Drell, P S; Ehrlich, R; Garca-Sciveres, M; Geiser, B; Gittelman, B; Gray, S W; Hartill, D L; Heltsley, B K; Jones, C D; Jones, S L; Kandaswamy, J; Katayama, N; Kim, P C; Kreinick, D L; Ludwig, G S; Masui, J; Mevissen, J; Mistry, N B; Ng, C R; Nordberg, E; Patterson, J R; Peterson, D; Riley, D; Salman, S; Sapper, M; Wrthwein, F; Avery, P; Freyberger, A; Rodrguez, J; Stephens, R; Yang, S; Yelton, J; Cinabro, D; Henderson, S; Liu, T; Saulnier, M; Wilson, R; Yamamoto, H

1994-01-01T23:59:59.000Z

250

Decay processes in an inhomogeneous time-varying plasma  

SciTech Connect

The decay of a homogeneous pump field in an inhomogeneous time-varying plasma into a plasma wave and an ion-acoustic wave is considered theoretically.

Andreev, A.A.; Fedorov, V.I.

1977-12-01T23:59:59.000Z

251

Radioactive-nuclide decay data in science and technology  

SciTech Connect

The scope of ENDF/B has recently been expanded to include radioactive- nuclide decay data. In this paper, the content and organization of the decay data which are included in ENDF/B are presented and discussed. The application of decay data in a wide variety of nuclear-related activities is illustrated by a number of examples. Two items pointed up by the ENDF/B decay-data compilation effort are treated: the identification of deficiencies in the data; and the importance of a radioactive-nuclide metrology effort oriented toward supplying these needs in a systematic fashion. (3 figures, 1 table) (auth)

Reich, C.W.; Helmer, R.G.

1975-01-01T23:59:59.000Z

252

Optical detection of atmospheric 238U decay products  

Science Conference Proceedings (OSTI)

Current and proposed programs involving aerial survey of uranium resources require remote sensing of 238U decay products with high sensitivity. In this paper

Jerry E. Solomon

1977-01-01T23:59:59.000Z

253

Some numerical reslts on best uniform polynomial approximation of. chi. sup. alpha. on (0,1)  

SciTech Connect

Let {alpha} be a positive number, and let E{sub n}(chi{sup {alpha}}; (0,1)) denote the error of best uniform approximation to {chi}{sup {alpha}}, by polynomials of degree at most n, on the interval (0,1). The Russian mathematician S.N. Bernstein established the existence of a nonnegative constant {Beta}({alpha}) such that {Beta}({alpha}):= {sub n{yields}{infinity}lim(2n){sup 2{alpha}}E{sub n}({chi}{sup {alpha}};(0.1)). In addition, Bernstein showed that {Beta}{alpha} < {Gamma}(2{alpha}){vert bar}sin(pi}{alpha}){vert bar}/{pi} ({alpha} > 0) and that {Gamma}(2{alpha}){vert bar}sin({pi}{alpha}){vert bar}/{pi} (1{minus}1/2{alpha}{minus}1) < {Beta}({alpha}) ({alpha} > {1/2}), so that the asymptotic behavior of {Beta}({alpha}) is known when {alpha}{yields}{infinity}. Still, the problem of trying to determine {Beta}({alpha}) more precisely, for all {alpha} > 0, is intriguing. To this end, we have rigorously determined the numbers for thirteen values of {alpha}, where these numbers were calculated with a precision of at least 200 significant digits. For each of these thirteen values of {alpha}, Richardson's extrapolation was applied to the products to obtain estimates of {Beta}({alpha}) to approximately 40 decimal places. Included are graphs of the points ({alpha},{Beta}({alpha})) for the thirteen values of {alpha} that we considered.

Carpenter, A.J.; Varga, R.S.

1992-01-01T23:59:59.000Z

254

Neutron Interactions in the CUORE Neutrinoless Double Beta Decay Experiment  

SciTech Connect

Neutrinoless double beta decay (0{nu}DBD) is a lepton-number violating process that can occur only for a massive Majorana neutrino. The search for 0{nu}DBD is currently the only practical experimental way to determine whether neutrinos are identical to their own antiparticles (Majorana neutrinos) or have distinct particle and anti-particle states (Dirac neutrinos). In addition, the observation of 0{nu}DBD can provide information about the absolute mass scale of the neutrino. The Cuoricino experiment was a sensitive search for 0{nu}DBD, as well as a proof of principle for the next generation experiment, CUORE. CUORE will search for 0{nu}DBD of {sup 130}Te with a ton-scale array of unenriched TeO{sub 2} bolometers. By increasing mass and decreasing the background for 0{nu}DBD, the half-life sensitivity of CUORE will be a factor of twenty better than that of Cuoricino. The site for both of these experiments is the Laboratori Nazionali del Gran Sasso, an underground laboratory with 3300 meters water equivalent rock overburden and a cosmic ray muon attenuation factor of 10{sup -6}. Because of the extreme low background requirements for CUORE, it is important that all potential sources of background in the 0{nu}DBD peak region at 2530 keV are well understood. One potential source of background for CUORE comes from neutrons, which can be produced underground both by ({alpha},n) reactions and by fast cosmic ray muon interactions. Preliminary simulations by the CUORE collaboration indicate that these backgrounds will be negligible for CUORE. However, in order to accurately simulate the expected neutron background, it is important to understand the cross sections for neutron interactions with detector materials. In order to help refine these simulations, I have measured the gamma-ray production cross sections for interactions of neutrons on the abundant stable isotopes of Te using the GEANIE detector array at the Los Alamos Neutron Science Center. In addition, I have used the GEANIE data to set an upper limit for the production of a 2529 keV gamma-ray from the {sup 126}Te(n,n{prime}{gamma}) reaction. This gamma-ray is a potential source of interference for the 0{nu}DBD peak. Based on this measurement, the contribution of this line to the background is expected to be negligible.

Dolinski, M J

2008-09-24T23:59:59.000Z

255

Electromagnetic decays of excited states in {sup 261}Sg (Z=106) and {sup 257}Rf (Z=104)  

Science Conference Proceedings (OSTI)

An isomeric one-quasineutron state, likely based on the [725]11/2{sup -} Nilsson level, was identified in {sup 261}Sg by its decay via internal conversion electrons. The state has an excitation energy of approx =200 keV and a half-life of 9.0{sub -1.5}{sup +2.0} mus. {sup 261}Sg has the highest Z and A of any nucleus in which the electromagnetic decay of an isomeric state was observed to date. A separate experiment was performed on the alpha daughter nucleus of {sup 261}Sg, namely {sup 257}Rf. Spectroscopy of delayed gamma rays and converted electrons from {sup 257}Rf resulted in the identification of a K isomer at an excitation energy of approx =1125 keV with a half-life of 134.9 +- 7.7 mus. The spin of the isomeric state is tentatively assigned I=21/2,23/2 and the state likely decays to a rotational band built on the [725]11/2{sup -} Nilsson level via a DELTAK=5 or 6 transition. The present results provide new information on excited states in the transactinide region, which is important for testing models of the heaviest elements.

Berryman, J. S.; Clark, R. M.; Gregorich, K. E.; Cromaz, M.; Dvorak, J.; Fallon, P.; Gros, S.; Lee, I. Y.; Macchiavelli, A. O.; Paschalis, S.; Petri, M.; Qian, J. [Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States); Allmond, J. M. [Department of Physics, University of Richmond, Virginia 23173 (United States); Bleuel, D. L.; Stoyer, M. A.; Wiedeking, M. [Lawrence Livermore National Laboratory, Livermore, California 94551 (United States); Dragojevic, I.; Ellison, P. A.; Garcia, M. A. [Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States); Department of Chemistry, University of California, Berkeley, California 94720 (United States)

2010-06-15T23:59:59.000Z

256

Alternate Alpha Induced Reactions for NIF Radiochemistry  

SciTech Connect

Radiochemical analysis of NIF capsule residues has been identified as a potential diagnostic of NIF capsule performance. In particular, alpha-induced nuclear reactions that occur on tracer elements added to the NIF capsule have been shown through simulation to be a very sensitive diagnostic for mix. The short range of the alpha particles makes them representative of the hot spot where they are created through the fusion of deuterium and tritium. Reactions on elements doped into the innermost part of the capsule ablator would therefore be sensitive to material that had mixed into the hot spot. Radiochemical determinations of activated detector elements may perhaps be the only true measure of mix that occurs in a NIF capsule, particularly in cases when the capsule fails.

Shaughnessy, D A; Moody, K J; Bernstein, L A

2010-02-26T23:59:59.000Z

257

Chiral Suppression of Scalar Glueball Decay  

DOE Green Energy (OSTI)

Because glueballs are SU(3){sub Flavor} singlets, they are expected to couple equally to u,d, and s quarks, so that equal coupling strengths to {pi}{sup +}{pi}{sup -} and K{sup +}K{sup -} are predicted. However, we show that chiral symmetry implies the scalar glueball amplitude for G{sub 0} {yields} {bar q}q is proportional to the quark mass, so that mixing with {bar s}s mesons is enhanced and decays to K{sup +}K{sup -} are favored over {pi}{sup +}{pi}{sup -}. Together with evidence from lattice calculations and from experiment, this supports the hypothesis that f{sub 0}(1710) is the ground state scalar glueball.

Chanowitz, Michael S.

2005-06-10T23:59:59.000Z

258

Search for invisibly decaying Higgs bosons  

E-Print Network (OSTI)

In the last running years, the four Large Electron Positron collider (LEP) experiments collected a combined luminosity of almost 2.5 fb ?1 at ? s ? 189 GeV. This data was searched for invisibly decaying Higgs bosons produced in association with a Z boson. The channels with electrons, muons and hadrons were investigated. None of the experiments sees hints for the production of such an invisible Higgs boson, thus each of them sets an individual lower limit on the mass at 95 % confidence level. The highest of the four limits is set at 114.1 GeV. The combination of the final results has yet to be done and will increase the reach of the search. PoS(HEP2005)329

Andr Georg Holzner; Andr Georg Holzner

2005-01-01T23:59:59.000Z

259

First Attempts at Antihydrogen Trapping in ALPHA  

SciTech Connect

The ALPHA apparatus is designed to produce and trap antihydrogen atoms. The device comprises a multifunction Penning trap and a superconducting, neutral atom trap having a minimum-B configuration. The atom trap features an octupole magnet for transverse confinement and solenoidal mirror coils for longitudinal confinement. The magnetic trap employs a fast shutdown system to maximize the probability of detecting the annihilation of released antihydrogen. In this article we describe the first attempts to observe antihydrogen trapping.

Andresen, G. B.; Bowe, P. D.; Hangst, J. S. [Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C (Denmark); Bertsche, W.; Butler, E.; Charlton, M.; Humphries, A. J.; Jenkins, M. J.; Joergensen, L. V.; Madsen, N.; Werf, D. P. van der [Department of Physics, Swansea University, Swansea SA2 8PP (United Kingdom); Bray, C. C.; Chapman, S.; Fajans, J.; Povilus, A.; Wurtele, J. S. [Department of Physics, University of California at Berkeley, Berkeley, CA 94720-7300 (United States); Cesar, C. L.; Lambo, R.; Silveira, D. M. [Instituto de Fisica Universidade Federal do Rio de Janeiro, Rio de Janeiro 21941-972 (Brazil); Fujiwara, M. C. [TRIUMF, 4004 Wesbrook Mall, Vancouver BC, V6T 2A3 (Canada)] (and others)

2008-08-08T23:59:59.000Z

260

Detection of alpha radiation in a beta radiation field  

DOE Patents (OSTI)

An apparatus and method for detecting alpha particles in the presence of high activities of beta particles utilizing an alpha spectrometer. The apparatus of the present invention utilizes a magnetic field applied around the sample in an alpha spectrometer to deflect the beta particles from the sample prior to reaching the detector, thus permitting detection of low concentrations of alpha particles. In the method of the invention, the strength of magnetic field required to adequately deflect the beta particles and permit alpha particle detection is given by an algorithm that controls the field strength as a function of sample beta energy and the distance of the sample to the detector.

Mohagheghi, Amir H. (Albuquerque, NM); Reese, Robert P. (Edgewood, NM)

2001-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "alpha decay suspected" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

On the Decay of Tropical Cyclone Winds Crossing Narrow Landmasses  

Science Conference Proceedings (OSTI)

A method is developed to adjust the Kaplan and DeMaria tropical cyclone inland wind decay model for storms that move over narrow landmasses. The basic assumption that the wind speed decay rate after landfall is proportional to the wind speed is ...

Mark DeMaria; John A. Knaff; John Kaplan

2006-03-01T23:59:59.000Z

262

Reach in All Hadronic Stop Decays: A Snowmass White Paper  

E-Print Network (OSTI)

We study the discovery prospects for stops which decay to a top and a light neutralino. We consider fully hadronic decays of the tops and present an estimate for the reach at various future collider runs. Our results are summarized in Table 1.

Stolarski, Daniel

2013-01-01T23:59:59.000Z

263

Reach in All Hadronic Stop Decays: A Snowmass White Paper  

E-Print Network (OSTI)

We study the discovery prospects for stops which decay to a top and a light neutralino. We consider fully hadronic decays of the tops and present an estimate for the reach at various future collider runs. Our results are summarized in Table 1.

Daniel Stolarski

2013-09-06T23:59:59.000Z

264

Baryonic Decays of Charmonium - a Window on Internal Baryon Structure  

E-Print Network (OSTI)

The baryonic decays of $J/ \\psi$ provide a new way to study the internal structure of baryons. A simple diquark model applied to the calculation of the $\\bar{B}B$ decay cross-sections is compared with the ordinary constituent quark model. Various models also give different predictions for the rates involving the $N^{\\ast}(1440)$ resonance in the final state.

A. Cieply

2004-12-03T23:59:59.000Z

265

Distribution of ranks of ?-decay half-lives  

E-Print Network (OSTI)

I studied the distribution of ranks of values of 2949 {\\beta}-decay half-lives according to an empirical beta law with two exponents. {\\beta}-decay half-life ranks showed good fit to a beta function with two exponents.

Juan Miguel Campanario

2010-11-21T23:59:59.000Z

266

Bayesian Statistics at Work: the Troublesome Extraction of the CKM Phase alpha  

E-Print Network (OSTI)

In Bayesian statistics, one's prior beliefs about underlying model parameters are revised with the information content of observed data from which, using Bayes' rule, a posterior belief is obtained. A non-trivial example taken from the isospin analysis of B-->PP (P = pi or rho) decays in heavy-flavor physics is chosen to illustrate the effect of the naive "objective" choice of flat priors in a multi-dimensional parameter space in presence of mirror solutions. It is demonstrated that the posterior distribution for the parameter of interest, the phase alpha, strongly depends on the choice of the parameterization in which the priors are uniform, and on the validity range in which the (un-normalizable) priors are truncated. We prove that the most probable values found by the Bayesian treatment do not coincide with the explicit analytical solution, in contrast to the frequentist approach. It is also shown in the appendix that the alpha-->0 limit cannot be consistently treated in the Bayesian paradigm, because the latter violates the physical symmetries of the problem.

J. Charles; A. Hocker; H. Lacker; F. R. Le Diberder; S. T'Jampens

2006-07-22T23:59:59.000Z

267

Search for di-muon decays of a low-mass Higgs boson in radiative decays of the ?(1S)  

E-Print Network (OSTI)

We search for di-muon decays of a low-mass Higgs boson (A[superscript 0]) produced in radiative ?(1S) decays. The ?(1S) sample is selected by tagging the pion pair in the ?(2S,3S)??[superscript +]?[superscript -]?(1S) ...

Cowan, Ray Franklin

268

Uncertainty evaluation of delayed neutron decay parameters  

E-Print Network (OSTI)

In a nuclear reactor, delayed neutrons play a critical role in sustaining a controllable chain reaction. Delayed neutrons relative yields and decay constants are very important for modeling reactivity control and have been studied for decades. Researchers have tried different experimental and numerical methods to assess these delayed neutron parameters. The reported parameter values vary widely, much more than the small statistical errors reported with these parameters. Interestingly, the reported parameters fit their individual measurement data well in spite of these differences. This dissertation focuses on evaluation of the errors and methods of delayed neutron relative yields and decay constants for thermal fission of U-235. Various numerical methods used to extract the delayed neutron parameter from the measured data, including Matrix Inverse, Levenberg-Marquardt, and Quasi-Newton methods, were studied extensively using simulated delayed neutron data. This simulated data was Poisson distributed around Keepins theoretical data. The extraction methods produced totally different results for the same data set, and some of the above numerical methods could not even find solutions for some data sets. Further investigation found that ill-conditioned matrices in the objective function were the reason for the inconsistent results. To find a reasonable solution with small variation, a regularization parameter was introduced using a numerical method called Ridge Regression. The results from the Ridge Regression method, in terms of goodness of fit to the data, were good and often better than the other methods. Due to the introduction of a regularization number in the algorithm, the fitted result contains a small additional bias, but this method can guarantee convergence no matter how large the coefficient matrix condition number. Both saturation and pulse modes were simulated to focus on different groups. Some of the factors that affect the solution stability were investigated including initial count rate, sample flight time, initial guess values. Finally, because comparing reported delayed neutron parameters among different experiments is useless to determine if their data actually differs, methods are proposed that can be used to compare the delayed neutron data sets.

Wang, Jinkai

2008-12-01T23:59:59.000Z

269

Evidence for the suppressed decay B^- -> DK^-, D -> K^+?^-?^0  

E-Print Network (OSTI)

We report a study of the suppressed decay B^- -> DK^-, D -> K^+\\pi^-\\pi^0, where D denotes either a D^0 or a \\bar{D}^0 meson. The decay is sensitive to the CP-violating parameter \\phi_3. Using a data sample of 772 x 10^6 B\\bar{B} pairs collected at the \\Upsilon(4S) resonance with the Belle detector, we measure the ratio of branching fractions of the above suppressed decay to the favored decay B^- -> DK^-, D -> K^-\\pi^+\\pi^0. Our result is R_{DK} = [1.98 +/- 0.62(stat.) +/- 0.24(syst.)] x 10^{-2}, which indicates the first evidence of the signal for this suppressed decay with a significance of 3.2 standard deviations. We measure the direct CP asymmetry between the suppressed B^- and B^+ decays to be A_{DK} = 0.41 +/- 0.30 (stat.) +/- 0.05 (syst.). We also report measurements for the analogous quantities R_{D\\pi} and A_{D\\pi} for the decay B^- -> D\\pi^-, D -> K^+\\pi^-\\pi^0.

Belle Collaboration; M. Nayak; J. Libby; K. Trabelsi; I. Adachi; H. Aihara; D. M. Asner; T. Aushev; A. M. Bakich; A. Bala; P. Behera; K. Belous; V. Bhardwaj; G. Bonvicini; A. Bozek; M. Bra?ko; T. E. Browder; D. ?ervenkov; M. -C. Chang; P. Chang; V. Chekelian; A. Chen; B. G. Cheon; R. Chistov; I. -S. Cho; K. Cho; V. Chobanova; Y. Choi; D. Cinabro; J. Dalseno; M. Danilov; Z. Doleal; Z. Drsal; D. Dutta; S. Eidelman; S. Esen; H. Farhat; J. E. Fast; T. Ferber; V. Gaur; N. Gabyshev; S. Ganguly; R. Gillard; Y. M. Goh; B. Golob; J. Haba; H. Hayashii; Y. Horii; Y. Hoshi; W. -S. Hou; H. J. Hyun; T. Iijima; A. Ishikawa; T. Iwashita; I. Jaegle; T. Julius; D. H. Kah; E. Kato; D. Y. Kim; H. J. Kim; J. B. Kim; M. J. Kim; Y. J. Kim; K. Kinoshita; J. Klucar; B. R. Ko; P. Kody; S. Korpar; P. Krishnan; P. Krian; P. Krokovny; T. Kuhr; T. Kumita; A. Kuzmin; Y. -J. Kwon; S. -H. Lee; J. Li; Y. Li; L. Li Gioi; Y. Liu; D. Liventsev; P. Lukin; H. Miyake; R. Mizuk; G. B. Mohanty; A. Moll; T. Mori; N. Muramatsu; R. Mussa; Y. Nagasaka; M. Nakao; E. Nedelkovska; K. Negishi; C. Ng; N. K. Nisar; O. Nitoh; S. Ogawa; S. Okuno; Y. Onuki; P. Pakhlov; G. Pakhlova; C. W. Park; H. Park; T. K. Pedlar; M. Petri?; L. E. Piilonen; M. Ritter; M. Rhrken; A. Rostomyan; H. Sahoo; T. Saito; Y. Sakai; S. Sandilya; L. Santelj; T. Sanuki; V. Savinov; O. Schneider; G. Schnell; C. Schwanda; A. J. Schwartz; K. Senyo; O. Seon; M. E. Sevior; M. Shapkin; C. P. Shen; T. -A. Shibata; J. -G. Shiu; B. Shwartz; A. Sibidanov; F. Simon; Y. -S. Sohn; A. Sokolov; E. Solovieva; M. Stari?; M. Steder; Z. Suzuki; U. Tamponi; G. Tatishvili; Y. Teramoto; M. Uchida; T. Uglov; Y. Unno; S. Uno; P. Urquijo; S. E. Vahsen; C. Van Hulse; P. Vanhoefer; G. Varner; K. E. Varvell; M. N. Wagner; C. H. Wang; M. -Z. Wang; Y. Watanabe; K. M. Williams; E. Won; Y. Yamashita; S. Yashchenko; Y. Yusa; V. Zhilich; V. Zhulanov; A. Zupanc

2013-10-07T23:59:59.000Z

270

Extracellular oxidative metabolism of wood decay fungi  

DOE Green Energy (OSTI)

Substantial progress has been made toward understanding the fundamental physiology and genetics of wood decay fungi, microbes that are capable of degrading all major components of plant cell walls. Efficient utilization of lignocellulosic biomass has been hampered in part by limitations in our understanding of enzymatic mechanisms of plant cell wall degradation. This is particularly true of woody substrates where accessibility and high lignin content substantially complicate enzymatic 'deconstruction'. The interdisciplinary research has illuminated enzymatic mechanisms essential for the conversion of lignocellulosics to simple carbohydrates and other small molecular weight products. Progress was in large part dependent on substantial collaborations with the Department of Energy's Joint Genome Institute (JGI) in Walnut Creek and Los Alamos, as well as the Catholic University, Santiago, Chile, the Royal Institute of Technology, Stockholm, the University of Minnesota, St. Paul, and colleagues at the University of Wisconsin and the Forest Products Laboratory. Early accomplishments focused on the development of experimental tools (2, 7, 22, 24-26, 32) and characterization of individual genes and enzymes (1, 3-5, 8, 9, 11, 14, 15, 17, 18, 23, 27, 33). In 2004, the genome of the most intensively studied lignin-degrading fungus, Phanerochaete chrysosporium, was published (21). This milestone lead to additional progress on this important model system (6, 10, 12, 13, 16, 28-31) and was further complemented by genome analysis of other important cellulose-degrading fungi (19, 20). These accomplishments have been highly cited and have paved the way for whole new research areas.

Daniel Cullen

2010-04-21T23:59:59.000Z

271

Semileptonic Decays and Sides of the Unitarity Triangle  

SciTech Connect

The elements of the CKM matrix enter the expressions for the decay rates and mixing amplitudes of hadrons. In some cases, the theoretical expressions are free of strong interaction effects, for example the CP asymmetry in B {yields} J/{psi} K{sub S}{sup 0}, so that measuring the CP asymmetry directly gives the value of sin 2{beta}, with the error in the result given by the experimental error in the measurement. In most cases, however, the experimentally measured quantities depend on strong interactions physics, and it is absolutely essential to have accurate model-free theoretical calculations to compare with experiment. A number of theoretical tools have been developed over the years which now allow us to compute B decays with great accuracy, sometimes at the level of a few percent or better. These calculations are done using effective theory methods applied to QCD, and do not rely on model assumptions. Inclusive decays can be treated using the operator product expansion (OPE). The total decay rate is given by twice the imaginary part of the forward scattering amplitude, using the optical theorem. In heavy hadron decays, the intermediate states in the forward scattering amplitude can be integrated out, so that the decay rate can be written as an expansion in local operators. The expansion parameter is 1/m{sub B}, the mass of the decaying hadron. OPE techniques have been well-studied in the context of deep-inelastic scattering, where the expansion in powers of 1/Q{sup 2} is called the twist expansion. In inclusive B decays, the leading term in the 1/m{sub B} expansion gives the parton decay rate, and nonperturbative effects enter at higher orders in 1/m{sub B}.

Ligeti, Zoltan; Bauer, C.; Bernard, C.; Bigi, I.; Datta, M.; del Re, D.; Grinstein, B.; Hashimoto, S.; Langenegger, U.; Ligeti, Z.; Luke, M.; Lunghi, E.; Mackenzie, P.; Manohar, A.; Moore, T.; Pirjol, D.; Robertson, S.; Rothstein, I.; Stewart, I.; Voloshin, M.

2003-05-01T23:59:59.000Z

272

Measurement of the q2 Dependence of the Hadronic Form Factor in D0 to K- e+ nu_e Decays  

Science Conference Proceedings (OSTI)

A preliminary measurement of the q{sup 2} dependence of the D{sup 0} {yields} K{sup -}e{sup +}{nu}{sub e} decay rate is presented. This rate is proportional to the hadronic form factor squared, specified by a single parameter. This is either the mass in the simple pole ansatz m{sub pole} = (1.854 {+-} 0.016 {+-} 0.020) GeV/c{sup 2} or the scale in the modified pole ansatz {alpha}{sub pole} = 0.43 {+-} 0.03 {+-} 0.04. The first error refers to the statistical, the second to the systematic uncertainty.

Aubert, B.

2006-09-26T23:59:59.000Z

273

Searches for New Physics in Top Decays at D0  

Science Conference Proceedings (OSTI)

The Tevatron proton-antiproton collider at Fermilab with its centre of mass energy of 1.96 TeV allows for pair production of top quarks and the study of top quark decay properties. This report reflects the current status of measurements of the W boson helicity in top quark decays and the ratio of top quark branching fractions as well as searches for neutral current top quark decays and pair production of fourth generation t' quarks, performed by the D0 Collaboration utilising datasets of up to 5.4 fb{sup -1}.

Pleier, Marc-Andre; /Brookhaven

2011-08-01T23:59:59.000Z

274

Update analysis of two-body charmed $B$ meson decays  

E-Print Network (OSTI)

The charmed B decays, $B\\to DP, ~D^*P$ and $DV$, are re-analyzed using the latest experimental data, where $P$ and $V$ denote the pseudoscalar meson and vector meson, respectively. We perform global fits under the assumption of flavor SU(3) symmetry. The size of the decay amplitudes and the strong phases between the topologically distinct amplitudes are studied. Predictions of the related $B_s$ decay rates are made based upon the fitted results. We also note a serious SU(3) symmetry breaking or inconsistency in the $DV$ sector.

Chiang, C W; Chiang, Cheng-Wei; Senaha, Eibun

2007-01-01T23:59:59.000Z

275

Aqueous chemical growth of alpha-Fe2O3-alpha-Cr203 nanocompositethin films  

DOE Green Energy (OSTI)

We are reporting here on the inexpensive fabrication and optical properties of an iron(III) oxide chromium(III) oxide nanocomposite thin film of corundum crystal structure. Its novel and unique-designed architecture consists of uniformed, well-defined and oriented nanorods of Hematite (alpha-Fe2O3) of 50 nm in diameter and 500nm in length and homogeneously distributed nonaggregated monodisperse spherical nanoparticles of Eskolaite (alpha-Cr2O3) of 250 nm in diameter. This alpha-Fe2O3 alpha-Cr2O3 nanocomposite thin film is obtained by growing, directly onto transparent polycrystalline conducting substrate, an oriented layer of hematite nanorods and growing subsequently, the eskolaite layer. The synthesis is carried out by a template-free, low-temperature, multilayer thin film coating process using aqueous solution of metal salts as precursors. Almost 100 percent of the light is absorbed by the composite film between 300 and 525 nm and 40 percent at 800 nm which yields great expectations as photoanode materials for photovoltaic cells and photocatalytic devices.

Vayssieres, Lionel; Guo, Jinghua; Nordgren, Joseph

2001-06-30T23:59:59.000Z

276

CRAD, Training - Oak Ridge National Laboratory TRU ALPHA LLWT Project |  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

TRU ALPHA LLWT TRU ALPHA LLWT Project CRAD, Training - Oak Ridge National Laboratory TRU ALPHA LLWT Project November 2003 A section of Appendix C to DOE G 226.1-2 "Federal Line Management Oversight of Department of Energy Nuclear Facilities." Consists of Criteria Review and Approach Documents (CRADs) used for a November 2003 assessment of the Training Program portion of an Operational Readiness Review of the Oak Ridge National Laboratory TRU ALPHA LLWT Project. CRADs provide a recommended approach and the types of information to gather to assess elements of a DOE contractor's programs. CRAD, Training - Oak Ridge National Laboratory TRU ALPHA LLWT Project More Documents & Publications CRAD, Quality Assurance - Oak Ridge National Laboratory TRU ALPHA LLWT Project

277

MFTF-. cap alpha. + T progress report  

SciTech Connect

Early in FY 1983, several upgrades of the Mirror Fusion Test Facility (MFTF-B) at Lawrence Livermore National Laboratory (LLNL) were proposed to the fusion community. The one most favorably received was designated MFTF-..cap alpha..+T. The engineering design of this device, guided by LLNL, has been a principal activity of the Fusion Engineering Design Center during FY 1983. This interim progress report represents a snapshot of the device design, which was begun in FY 1983 and will continue for several years. The report is organized as a complete design description. Because it is an interim report, some parts are incomplete; they will be supplied as the design study proceeds. As described in this report, MFTF-..cap alpha..+T uses existing facilities, many MFTF-B components, and a number of innovations to improve on the physics parameters of MFTF-B. It burns deuterium-tritium and has a central-cell Q of 2, a wall loading GAMMA/sub n/ of 2 MW/m/sup 2/ (with a central-cell insert module), and an availability of 10%. The machine is fully shielded, allows hands-on maintenance of components outside the vacuum vessel 24 h after shutdown, and has provisions for repair of all operating components.

Nelson, W.D. (ed.)

1985-04-01T23:59:59.000Z

278

GHRS Observations of the Lyman alpha Forest  

E-Print Network (OSTI)

I review the results obtained using the GHRS on low redshift Lyman alpha absorbers. Until the advent of HST and the GHRS, the existence of such absorbers was doubted. The confirmation of their existence, in one of the first GHRS GTO team results to be published, must rank as one of the HSTs most interesting results. The GHRS resolution allows us to probe equivalent widths well below those detectable with the FOS, and has led to a number of interesting new questions. One example is the apparent disagreement between the GHRS result that there are many Lyman alpha absorbers which are not associated with luminous galaxies, and FOS studies which suggest that all such absorbers have a nearby galaxy causing them. This almost certainly shows that the equivalent width (or column density) range reachable by the GHRS includes gas from a wide range of causes, and not only the halos of luminous galaxies. With these data, we are seeing the debris left over from Galaxy formation, material flung out from galaxy interactions and starbursts, and also diffuse halo material at the outer edges of normal galaxies.

Simon L. Morris

1996-10-28T23:59:59.000Z

279

Alpha inelastic scattering and cluster structures in {sup 24}Mg  

Science Conference Proceedings (OSTI)

The alpha inelastic scattering from {sup 24}Mg was measured to obtain the isoscalar natural-parity excitation strengths and to search for the {alpha}-condensed states. The multipole decomposition analysis for the measured cross sections was performed. The strength distributions for the {Delta}L = 0-3 were successfully obtained and the possible candidates for the {alpha}-condensed states around the {sup 16}O core were found.

Kawabata, T.; Ishiguro, Y.; Nozawa, Y.; Tomida, N.; Yokota, N. [Department of Physics, Kyoto University (Japan); Adachi, T.; Fujiwara, M.; Hatanaka, K.; Tamii, A.; Yasuda, Y.; Zenihiro, J. [Research Center for Nuclear Physics, Osaka University (Japan); Itoh, M.; Takahashi, T.; Yoshida, H. P. [Cyclotron and Radioisotope Center, Tohoku University (Japan); Maeda, Y.; Miyasako, H.; Saito, T. [Faculty of Engineering, University of Miyazaki (Japan); Matsubara, H.; Sasamoto, Y.; Tokieda, H. [Center for Nuclear Study, University of Tokyo (Japan)

2011-05-06T23:59:59.000Z

280

THEORETICAL ASPECTS OF NONLEPTONIC HYPERON DECAYS  

SciTech Connect

Recent experimental results on nonleptonic hyperon decays are studied on the basis of a doublet approximation for strong and weak interactions, with the implied suggestion that this higher symmetry may be more easlly discernable in such reactions in which K-panticles do not occur explicitly. The doublet approximation is characterized by a doublet spin I which is equal to 1/2, 1, 0 for baryons, pi , K, respectively, and by a K spin. It is not necessary to assume that the strong K interactions are weak compared to the strong pi interactions. For the mentioned reactions it is necessary to assume that the strong interactions which do not conserve I play a minor role compared to those which conserve I. The following refinement of the nonleptonic DELTA T = 1/2 rule is proposed. (T = isotopic spin.) The weak nonleptonic interactions consist of two parts H/sup (0)/, H/sup (1)/ with DELTA I = 0, 1, respectively. In the doublet approximation H/sup (o)/ and H/sup (1)/ separately conserve parity in the presence of all strong pi and K interactions. H/sup (o)/ and H/sup (1)/ together do not conserve parity, however. In addition to DELTA I = 1, H/sup )1)/ should in general satisfy a further constraint, but there are classes of graphs for which DELTA I = 1 is sufficient. Current x current structures for H/sup (o)/ and H/sup (1)/ are examined. Resul ts of an earlier paper can be viewed as a special case of the DELTA I = 0, 1 rule. The same is true for results obtained by Feldman, Matthews, and Salam and by Woifenstein. The considerations of these authors can be extended to wider classes of graphs. Odd relative helicity and the relation between rates for LAMBDA -- p + pi -, SIGMA + -- p + pi /sup o/ are consequences of the DELTA I = 0, 1 rule only. So is the prediction that XI decay is strongly P nonconserving. The parity properties of H/sup (o)/ H/sup (1)/ are sufficient conditions. It is a delicate question whether they are necessary. For a subset of graphs they are not necessary, but this set seems arbitrary. If it is assumed that the parity conditions are necessary, the schizon scheme is ruled out. It is noted that the nonleptonic weak interactions may be generated by the strong interactions in terms of the following prescription. H/sup (1)/ is generated by assuming that the pi (K) fields have small K( pi ) components. An H/sup (o)/ is generated by assuming that the doublets N/sup 1/(N/sup 2/) have small N/sub 2/(N/sub 1/) components; likewise for N/sub 3/ and N/sub 4/. Further, it is observed thai one can construct a non- electromagnetic DELTA T =3/2 interaction which is small in the sense that it only contributes to K/sub pi //sub 2+/ to the extent t hat the doublet approximation is not valid. (auth)

Pais, A.

1961-04-01T23:59:59.000Z

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We encourage you to perform a real-time search of NLEBeta
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281

Atomistic Modeling of Screw Dislocation Mobility in Alpha-Fe  

Science Conference Proceedings (OSTI)

Register as a New User ... Presentation Title, Atomistic Modeling of Screw Dislocation Mobility in Alpha-Fe. Author(s), Neeraj S. Thirumalai, Peter Gordon, Ju Li,...

282

Crystallographic variant selection in {alpha}-{beta} brass  

Science Conference Proceedings (OSTI)

The transformation texture of {alpha}/{beta} brass with a diffusional Widmanstaetten {alpha} growth morphology has been investigated. Electron micrographs and electron backscattered diffraction was used to determine that the orientation relationship between the {beta} phase and the {alpha} associated with nucleation at {beta} grain boundaries was 44.3 deg . Crystallographic variant selection was observed across those prior {beta}/{beta} grain boundaries, but this has little effect on the transformation texture due to the crystal symmetry. The effect of the crystallographic variant selection on texture is further weakened by nucleation of diffusional transformed {alpha} in the grain interior.

Stanford, N. [Manchester Materials Science Centre, University of Manchester, Grosvenor Street, Manchester M1 7HS (United Kingdom); Bate, P.S. [Manchester Materials Science Centre, University of Manchester, Grosvenor Street, Manchester M1 7HS (United Kingdom)]. E-mail: pete.bate@man.ac.uk

2005-02-01T23:59:59.000Z

283

Progress on Production of Alpha-emitting Radioisotopes for Cancer...  

Office of Science (SC) Website

Progress on Production of Alpha-emitting Radioisotopes for Cancer Therapy Nuclear Physics (NP) NP Home About Research Facilities Science Highlights Benefits of NP Funding...

284

Superconducting calorimetric alpha particle sensors for nuclear nonproliferation applications  

Science Conference Proceedings (OSTI)

Identification of trace nuclear materials is usually accomplished by alpha spectrometry. Current detectors cannot distinguish critical elements and isotopes. We have developed a detector called a microcalorimeter

Robert D. Horansky; Joel N. Ullom; James A. Beall; Gene C. Hilton; Kent D. Irwin; Donald E. Dry; Elizabeth P. Hastings; Stephen P. Lamont; Clifford R. Rudy; Michael W. Rabin

2008-01-01T23:59:59.000Z

285

Modeling Dislocation Slip Transmission across Alpha-Beta Interface ...  

Science Conference Proceedings (OSTI)

After matching the two GSFs at the alpha-beta interface with Burgers orientation relationship, we perform microscopic phase field simulations. These simulations ...

286

Analysis of alpha Centauri AB including seismic constraints  

E-Print Network (OSTI)

Detailed models of alpha Cen A and B based on new seismological data for alpha Cen B by Carrier & Bourban (2003) have been computed using the Geneva evolution code including atomic diffusion. Taking into account the numerous observational constraints now available for the alpha Cen system, we find a stellar model which is in good agreement with the astrometric, photometric, spectroscopic and asteroseismic data. The global parameters of the alpha Cen system are now firmly constrained to an age of t=6.52+-0.30 Gyr, an initial helium mass fraction Y_i=0.275+-0.010 and an initial metallicity (Z/X)_i=0.0434+-0.0020. Thanks to these numerous observational constraints, we confirm that the mixing-length parameter alpha of the B component is larger than the one of the A component, as already suggested by many authors (Noels et al. 1991, Fernandes & Neuforge 1995 and Guenther & Demarque 2000): alpha_B is about 8% larger than alpha_A (alpha_A=1.83+-0.10 and alpha_B=1.97+-0.10). Moreover, we show that asteroseismic measurements enable to determine the radii of both stars with a very high precision (errors smaller than 0.3%). The radii deduced from seismological data are compatible with the new interferometric results of Kervella et al. (2003) even if they are slightly larger than the interferometric radii (differences smaller than 1%).

P. Eggenberger; C. Charbonnel; S. Talon; G. Meynet; A. Maeder; F. Carrier; G. Bourban

2004-01-29T23:59:59.000Z

287

A Toy Model Study of Decay Trapping | Superconducting Magnet Division  

NLE Websites -- All DOE Office Websites (Extended Search)

A Toy Model Study of Decay Trapping, reported by Brett Parker A Toy Model Study of Decay Trapping, reported by Brett Parker Introduction A group from the BNL Superconducting Magnet Division is looking at various options for dipole magnets which would be suitable for use in a muon storage ring that is used as a neutrino factory. Since the useful neutrino beams from a neutrino factory come from straight sections it is desirable to minimize the rings arc circumference, in relation to straight section length, in order to ensure that the fraction of muons which decay in the straight section is as large as possible. Therefore superconducting magnets, with higher B-fields and smaller bend radii, are reasonable to consider for this application. Unfortunately the decay electrons generated along with the neutrinos carry on average about a third of the original

288

Large-Eddy Simulation of Decaying Stably Stratified Turbulence  

Science Conference Proceedings (OSTI)

A large-eddy simulation (LES) model is developed and employed to study the interactions among turbulent and internal gravity wave motions in a uniformly stratified fluid at oceanic space and time scales. The decay of a random initial energy ...

David A. Siegel; J. Andrzej Domaradzki

1994-11-01T23:59:59.000Z

289

Neutrino-less Double Beta Decay and Particle Physics  

E-Print Network (OSTI)

We review the particle physics aspects of neutrino-less double beta decay. This process can be mediated by light massive Majorana neutrinos (standard interpretation) or by something else (non-standard interpretations). The physics potential of both interpretations is summarized and the consequences of future measurements or improved limits on the half-life of neutrino-less double beta decay are discussed. We try to cover all proposed alternative realizations of the decay, including light sterile neutrinos, supersymmetric or left-right symmetric theories, Majorons, and other exotic possibilities. Ways to distinguish the mechanisms from one another are discussed. Experimental and nuclear physics aspects are also briefly touched, alternative processes to double beta decay are discussed, and an extensive list of references is provided.

Werner Rodejohann

2011-06-07T23:59:59.000Z

290

Evidence of the Higgs Boson Decaying into Two Photons.  

E-Print Network (OSTI)

??A search for the standard model Higgs boson decaying to two photons will be presented. The analysis will cover 5.1 fb-1 and 19.6 fb-1 of (more)

Berry, Douglas R

2013-01-01T23:59:59.000Z

291

Decay of the Navier-Stokes-Poisson equations  

E-Print Network (OSTI)

We establish the time decay rates of the solution to the Cauchy problem for the compressible Navier-Stokes-Poisson system via a refined pure energy method. In particular, the optimal decay rates of the higher-order spatial derivatives of the solution are obtained. The $\\Dot{H}^{-s}$($0\\le srates. As a corollary, we also obtain the usual $L^p$--$L^2$($1rates. Compared to the compressible Navier-Stokes system and the compressible irrotational Euler-Poisson system, our results imply that both the dispersion effect of the electric field and the viscous dissipation contribute to enhance the decay rate of the density. Our proof is based on a family of scaled energy estimates with minimum derivative counts and interpolations among them without linear decay analysis.

Wang, Yanjin

2011-01-01T23:59:59.000Z

292

Dynamics of Excimer Formation and Decay in Supercritical Krypton  

NLE Websites -- All DOE Office Websites (Extended Search)

Dynamics of Excimer Formation and Decay in Supercritical Krypton R. A. Holroyd, A. R. Cook and J. M. Preses J. Chem. Phys. 131, 224509 (2009). Find paper at Scitation Abstract:...

293

Lepton flavor violation decays with the fourth generation neutrino  

E-Print Network (OSTI)

We investigate the lepton flavor violation decays, $\\tau \\to \\mu\\gamma$, $\\tau \\to e\\gamma$ and $\\mu \\to e\\gamma$, in the framwork of a squential fourth generation model with a heavy fourth neutrino, $\

Huo, W J; Huo, Wu-Jun; Feng, Tai-Fu

2002-01-01T23:59:59.000Z

294

Modal Decay in the AustraliaAntarctic Basin  

Science Conference Proceedings (OSTI)

The barotropic intraseasonal variability in the AustraliaAntarctic Basin (AAB) is studied in terms of the excitation and decay of topographically trapped barotropic modes. The main objective is to reconcile two widely differing estimates of the ...

Wilbert Weijer; Sarah T. Gille; Frdric Vivier

2009-11-01T23:59:59.000Z

295

DECAY HEAT CONDITIONS OF CURRENT AND NEXT GENERATION REACTORS  

E-Print Network (OSTI)

Decay heat is an important parameter in reactor design. Fission products generate heat in the reactor core even when the reactor has shut down. This heat has potential to melt the core if heat removal is not sufficient, and it is what caused the accident in Japan last year. Thus, decay heat must be considered in reactor design for safety. The research focused on decay heat conditions of current and next generation reactors. US-APWR, ABWR, VHTR, and ABR were modeled and simulated using the program SCALE. When the reactors were simulated to operate for two years and cool down for one year, the ABR produced the most decay heat power during operation and cooling time, and the US-APWR, VHTR, and ABWR followed respectfully. Therefore, the ABR requires more coolant and cooling time than other reactors, and the ABWR requires the least.

Choe, JongSoo 1985-

2012-05-01T23:59:59.000Z

296

Searching for Double Beta Decay with the Enriched Xenon Observatory  

Science Conference Proceedings (OSTI)

The Enriched Xenon Observatory (EXO) Collaboration is building a series of experiments to search for the neutrinoless double beta decay of {sup 136}Xe. The first experiment, known as EXO-200, will utilize 200 kg of xenon enriched to 80% in the isotope of interest, making it the largest double beta decay experiment to date by one order of magnitude. This experiment is rapidly being constructed, and will begin data taking in 2007. The EXO collaboration is also developing a technique to identify on an event-by-event basis the daughter barium ion of the double beta decay. If successful, this method would eliminate all conventional radioactive backgrounds to the decay, resulting in an ideal experiment. We summarize here the current status of EXO-200 construction and the barium tag R&D program.

Hall, C.; /SLAC

2007-03-16T23:59:59.000Z

297

The Footprint under a Decaying Tropical Mesoscale Convective System  

Science Conference Proceedings (OSTI)

On 10 February 1993, during the Tropical Ocean Global Atmosphere Coupled OceanAtmosphere Response Experiment, the two NOAA WP-3Ds and the NCAR Electra flew under the anvil region of a decaying mesoscale convective system (MCS). Satellite and ...

Mark F. Geldmeier; Gary M. Barnes

1997-11-01T23:59:59.000Z

298

MEASUREMENT OF yyy FINAL STATES IN y DECAY  

E-Print Network (OSTI)

Fig. 2. The high mass projection of these data clearly showsdominate the low mass projection. There is no evidence inline in the high mass projection of Fig. 2. decays is The

Himel, T.M.

2013-01-01T23:59:59.000Z

299

Double Beta Decay: Historical Review of 75 Years of Research  

E-Print Network (OSTI)

Main achievements during 75 years of research on double beta decay have been reviewed. The existing experimental data have been presented and the capabilities of the next-generation detectors have been demonstrated.

A. S. Barabash

2011-04-14T23:59:59.000Z

300

Renewal convergence rates and correlation decay for homogeneous pinning models  

E-Print Network (OSTI)

A class of discrete renewal processes with super-exponentially decaying inter-arrival distributions coincides with the infinite volume limit of general homogeneous pinning models in their localized phase. Pinning models are statistical mechanics systems to which a lot of attention has been devoted both for their relevance for applications and because they are solvable models exhibiting a non-trivial phase transition. The spatial decay of correlations in these systems is directly mapped to the speed of convergence to equilibrium for the associated renewal processes. We show that close to criticality, under general assumptions, the correlation decay rate, or the renewal convergence rate, coincides with the inter-arrival decay rate. We also show that, in general, this is false away from criticality. Under a stronger assumption on the inter-arrival distribution we establish a local limit theorem, capturing thus the sharp asymptotic behavior of correlations.

Giacomin, Giambattista

2007-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "alpha decay suspected" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

Renewal convergence rates and correlation decay for homogeneous pinning models  

E-Print Network (OSTI)

A class of discrete renewal processes with super-exponentially decaying inter-arrival distributions coincides with the infinite volume limit of general homogeneous pinning models in their localized phase. Pinning models are statistical mechanics systems to which a lot of attention has been devoted both for their relevance for applications and because they are solvable models exhibiting a non-trivial phase transition. The spatial decay of correlations in these systems is directly mapped to the speed of convergence to equilibrium for the associated renewal processes. We show that close to criticality, under general assumptions, the correlation decay rate, or the renewal convergence rate, coincides with the inter-arrival decay rate. We also show that, in general, this is false away from criticality. Under a stronger assumption on the inter-arrival distribution we establish a local limit theorem, capturing thus the sharp asymptotic behavior of correlations.

Giambattista Giacomin

2007-06-03T23:59:59.000Z

302

Search for Hadronic Decays of a Light Higgs Boson in the Radiative Decay  

Science Conference Proceedings (OSTI)

The authors search for hadronic decays of a light Higgs boson (A{sup 0}) produced in radiative decays of an {Upsilon}(2S) or {Upsilon}(3S) meson, {Upsilon} {yields} {gamma}A{sup 0}. The data have been recorded by the BABAR experiment at the {Upsilon}(3S) and {Upsilon}(2S) center of mass energies, and include (121.3 {+-} 1.2) x 10{sup 6} {Upsilon}(3S) and (98.3 {+-} 0.9) x 10{sup 6} {Upsilon}(2S) mesons. No significant signal is observed. We set 90% confidence level upper limits on the product branching fractions {beta}({Upsilon}(nS) {yields} {gamma}A{sup 0}) {center_dot} {beta}(A{sup 0} {yields} hadrons) (n = 2 or 3) that range from 1 x 10{sup -6} for an A{sup 0} mass of 0.3 GeV/c{sup 2} to 8 x 10{sup -5} at 7 GeV/c{sup 2}.

Lees, J.P.; Poireau, V.; Tisserand, V.; Garra Tico, J.; Grauges, E.; Martinelli, M.; Milanes, D.A.; Palano, A.; Pappagallo, M.; Eigen, G.; Stugu, B.; Brown, D.N.; Kerth, L.T.; Kolomensky, Yu.G.; Lynch, G.; Koch, H.; Schroeder, T.; Asgeirsson, D.J.; Hearty, C.; Mattison, T.S.; McKenna, J.A.

2012-02-16T23:59:59.000Z

303

Searching for the fourth family quarks through anomalous decays  

Science Conference Proceedings (OSTI)

The flavor democracy hypothesis predicts the existence of the fourth standard model family. Because of the high masses of the fourth family quarks, their anomalous decays could be dominant if certain criteria are met. This will drastically change the search strategy at hadron colliders. We show that the fourth standard model family down quarks with masses up to 400-450 GeV can be observed (or excluded) via anomalous decays by Tevatron.

Sahin, M.; Sultansoy, S.; Turkoz, S. [TOBB University of Economics and Technology, Physics Division, Ankara (Turkey); TOBB University of Economics and Technology, Physics Division, Ankara, Turkey and Institute of Physics, National Academy of Sciences, Baku (Azerbaijan); Ankara University, Department of Physics, Ankara (Turkey)

2010-09-01T23:59:59.000Z

304

Neutrinoless $??$ decay nuclear matrix elements in an isotopic chain  

E-Print Network (OSTI)

We analyze nuclear matrix elements (NME) of neutrinoless double beta decay calculated for the Cadmium isotopes. Energy density functional methods including beyond mean field effects such as symmetry restoration and shape mixing are used. Strong shell effects are found associated to the underlying nuclear structure of the initial and final nuclei. Furthermore, we show that NME for two-neutrino double beta decay evaluated in the closure approximation, $M^{2\

Toms R. Rodrguez; Gabriel Martnez-Pinedo

2012-10-11T23:59:59.000Z

305

Constraining gamma from K* pi and rho K Decays  

E-Print Network (OSTI)

We show that information on the weak phase gamma can be extracted from the K* pi and rho K decays. Less hadronic uncertainty is involved when the observables of four of these modes are combined together. We further point out two approximate relations in these decay modes can help determine whether there are new physics contributions in Delta I = 1 transitions, as hinted in the K pi modes.

Cheng-Wei Chiang

2005-02-20T23:59:59.000Z

306

Constraining gamma from K* pi and rho K Decays  

E-Print Network (OSTI)

We show that information on the weak phase gamma can be extracted from the K* pi and rho K decays. Less hadronic uncertainty is involved when the observables of four of these modes are combined together. We further point out two approximate relations in these decay modes can help us determining whether there are new physics contributions in Delta I = 1 transitions, as hinted in the K pi modes.

Chiang, C W

2005-01-01T23:59:59.000Z

307

Some numerical reslts on best uniform polynomial approximation of. chi. sup. alpha. on (0,1)  

Science Conference Proceedings (OSTI)

Let {alpha} be a positive number, and let E{sub n}(chi{sup {alpha}}; (0,1)) denote the error of best uniform approximation to {chi}{sup {alpha}}, by polynomials of degree at most n, on the interval (0,1). The Russian mathematician S.N. Bernstein established the existence of a nonnegative constant {Beta}({alpha}) such that {Beta}({alpha}):= {sub n{yields}{infinity}lim(2n){sup 2{alpha}}E{sub n}({chi}{sup {alpha}};(0.1)). In addition, Bernstein showed that {Beta}{alpha} 0) and that {Gamma}(2{alpha}){vert bar}sin({pi}{alpha}){vert bar}/{pi} (1{minus}1/2{alpha}{minus}1) {1/2}), so that the asymptotic behavior of {Beta}({alpha}) is known when {alpha}{yields}{infinity}. Still, the problem of trying to determine {Beta}({alpha}) more precisely, for all {alpha} > 0, is intriguing. To this end, we have rigorously determined the numbers for thirteen values of {alpha}, where these numbers were calculated with a precision of at least 200 significant digits. For each of these thirteen values of {alpha}, Richardson's extrapolation was applied to the products to obtain estimates of {Beta}({alpha}) to approximately 40 decimal places. Included are graphs of the points ({alpha},{Beta}({alpha})) for the thirteen values of {alpha} that we considered.

Carpenter, A.J.; Varga, R.S.

1992-01-01T23:59:59.000Z

308

Effects of Vacuum Fluctuation Suppression on Atomic Decay Rates  

E-Print Network (OSTI)

The use of atomic decay rates as a probe of sub-vacuum phenomena will be studied. Because electromagnetic vacuum fluctuations are essential for radiative decay of excited atomic states, decay rates can serve as a measure of the suppression of vacuum fluctuation in non-classical states, such as squeezed vacuum states. In such states the renormalized expectation value of the square of the electric field or the energy density can be periodically negative, representing suppression of vacuum fluctuations. We explore the extent to which atomic decays can be used to measure the mean squared electric field or energy density. We consider a scheme in which atoms in an excited state transit a closed cavity whose lowest mode contains photons in a non-classical state. The change in the decay probability of the atom in the cavity due to the non-classical state can, under certain circumstances, serve as a measure of the mean squared electric field or energy density in the cavity. We derive a quantum inequality bound on the decrease in this probability. We also show that the decrease in decay rate can sometimes be a measure of negative energy density or negative squared electric field. We make some estimates of the magnitude of this effect, which indicate that an experimental test might be possible.

L. H. Ford; Thomas A. Roman

2009-07-09T23:59:59.000Z

309

Observation of Tau Decays with Two Neutral Kaons  

E-Print Network (OSTI)

We report on the observation of the decay \\Gamma ! K 0 K 0 \\Gamma in 3.11 fb \\Gamma1 of data taken with the CLEO II detector at the Cornell Electron Storage Ring. Both K 0 mesons are detected through their decays via K S ! + \\Gamma . Preliminary results on the branching fraction and on the resonant substructure are presented. In particular, we find B( \\Gamma ! K 0 K 0 \\Gamma ) = 0:083 \\Sigma 0:017 \\Sigma 0:017 %. We also comment on the sensitivity of the KK invariant mass spectrum to a non-zero tau-neutrino mass. Permanent address: University of Hawaii at Manoa y Permanent address: INP, Novosibirsk, Russia 2 I. INTRODUCTION Tau lepton decays of the type \\Gamma ! [KK] \\Gamma have been known to exist [1] for nearly a decade. However, due to the small decay width and difficulties associated with identifying kaons, little information is presently available for these decays. In this paper, we report on the observation of KK decays where both...

Balest Cho Ford; Ichep Ref; Gsl Cleo Conf; K. Cho; K. Lingel; M. Lohner; P. Rankin

1994-01-01T23:59:59.000Z

310

Gamma-Ray Lines from Radiative Dark Matter Decay  

E-Print Network (OSTI)

The decay of dark matter particles which are coupled predominantly to charged leptons has been proposed as a possible origin of excess high-energy positrons and electrons observed by cosmic-ray telescopes PAMELA and Fermi LAT. Even though the dark matter itself is electrically neutral, the tree-level decay of dark matter into charged lepton pairs will generically induce radiative two-body decays of dark matter at the quantum level. Using an effective theory of leptophilic dark matter decay, we calculate the rates of radiative two-body decays for scalar and fermionic dark matter particles. Due to the absence of astrophysical sources of monochromatic gamma rays, the observation of a line in the diffuse gamma-ray spectrum would constitute a strong indication of a particle physics origin of these photons. We estimate the intensity of the gamma-ray line that may be present in the energy range of a few TeV if the dark matter decay interpretation of the leptonic cosmic-ray anomalies is correct and comment on observational prospects of present and future Imaging Cherenkov Telescopes, in particular the CTA.

Mathias Garny; Alejandro Ibarra; David Tran; Christoph Weniger

2010-11-16T23:59:59.000Z

311

Performance of a large TeO2 crystal as a cryogenic bolometer in searching for neutrinoless double beta decay  

E-Print Network (OSTI)

Bolometers are ideal devices in the search for neutrinoless Double Beta Decay. Enlarging the mass of individual detectors would simplify the construction of a large experiment, but would also decrease the background per unit mass induced by alpha-emitters located close to the surfaces and background arising from external and internal gamma's. We present the very promising results obtained with a 2.13 kg TeO2 crystal. This bolometer, cooled down to a temperature of 10.5 mK in a dilution refrigerator located deep underground in the Gran Sasso National Laboratories, represents the largest thermal detector ever operated. The detector exhibited an energy resolution spanning a range from 3.9 keV (at 145 keV) to 7.8 keV (at the 2615 gamma-line of 208Tl) FWHM. We discuss the decrease in the background per unit mass that can be achieved increasing the mass of a bolometer.

L. Cardani; L. Gironi; J. W. Beeman; I. Dafinei; Z. Ge; G. Pessina; S. Pirro; Y. Zhu

2011-06-03T23:59:59.000Z

312

B Decay and CP Violation: CKM Angles and Sides at the BABAR and BELLE B-Factories  

Science Conference Proceedings (OSTI)

A remarkable success has been achieved by the B-Factories, going beyond expectation in some field, like the measurement of {gamma}. BABAR has now finished its data taking, leaving BELLE alone in the 'race', but still many analyses are going on. The CKM UT is constrained by both measurements of CP-conserving and CP-violating quantities, leading to a picture of the CKM sector consistent with the SM. Measurements of semi-leptonic decays benefit from improving experimental techniques and more precise theoretical computations. The angle {beta} is a precision measurement, reaching accuracy of SM calculation. The angle {alpha} will ultimatly be limited by penguin pollution. The measurement of {gamma} is reaching the 13{sup o} precision.

Verderi, Marc; /Ecole Polytechnique

2011-11-28T23:59:59.000Z

313

Summary of alpha-neutron sources in GADRAS.  

SciTech Connect

A common source of neutrons for calibration and testing is alpha-neutron material, named for the alpha-neutron nuclear reaction that occurs within. This material contains a long-lived alpha-emitter and a lighter target element. When the alpha particle from the emitter is absorbed by the target, neutrons and gamma rays are released. Gamma Detector Response and Analysis Software (GADRAS) includes built-in alpha-neutron source definitions for AcC, AmB, AmBe, AmF, AmLi, CmC, and PuC. In addition, GADRAS users may create their own alpha-neutron sources by placing valid alpha-emitters and target elements in materials within their one-dimensional models (1DModel). GADRAS has the ability to use pre-built alpha-neutron sources for plotting or as trace-sources in 1D models. In addition, if any material (existing or user-defined) specified in a 1D model contains both an alpha emitter in conjunction with a target nuclide, or there is an interface between such materials, then the appropriate neutron-emission rate from the alpha-neutron reaction will be computed. The gamma-emissions from these sources are also computed, but are limited to a subset of nine target nuclides. If a user has experimental data to contribute to the alpha-neutron gamma emission database, it may be added directly or submitted to the GADRAS developers for inclusion. The gadras.exe.config file will be replaced when GADRAS updates are installed, so sending the information to the GADRAS developers is the preferred method for updating the database. This is also preferable because it enables other users to benefit from your efforts.

Mitchell, Dean James; Thoreson, Gregory G.; Harding, Lee T.

2012-05-01T23:59:59.000Z

314

A Performance Evaluation of an Alpha EV7 Processing Node  

Science Conference Proceedings (OSTI)

In this paper we detail the performance of a new Alpha-Server node containing 16 Alpha EV7 CPUs. The EV7 processor is based on the EV68 processor core that is used in terascale systems at Los Alamos National Laboratory and the Pittsburgh Supercomputing ... Keywords: Performance, analysis, application performance, communication performance, high performance computing, memory performance

Darren J. Kerbyson; Adolfy Hoisie; Scott Pakin; Fabrizio Petrini; Harvey J. Wasserman

2004-05-01T23:59:59.000Z

315

TAE SATURATION OF ALPHA PARTICLE DRIVEN INSTABILITY IN TFTR \\Lambda  

E-Print Network (OSTI)

. B. White, Princeton Plasma Physics Laboratory Princeton University, Princeton, New Jersey 08543 H. L by the fusion produced alpha particles. In this paper we apply a recently developed nonlinear theory of kinetic induced by alpha particles includ­ ing FOW and FLR effects [8]. Additional calculation had been added

316

CRAD, Quality Assurance - Oak Ridge National Laboratory TRU ALPHA LLWT  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Quality Assurance - Oak Ridge National Laboratory TRU ALPHA Quality Assurance - Oak Ridge National Laboratory TRU ALPHA LLWT Project CRAD, Quality Assurance - Oak Ridge National Laboratory TRU ALPHA LLWT Project November 2003 A section of Appendix C to DOE G 226.1-2 "Federal Line Management Oversight of Department of Energy Nuclear Facilities." Consists of Criteria Review and Approach Documents (CRADs) used for a November 2003 assessment of the Quality Assurance Program portion of an Operational Readiness Review of the Oak Ridge National Laboratory TRU ALPHA LLWT Project. CRADs provide a recommended approach and the types of information to gather to assess elements of a DOE contractor's programs. CRAD, Quality Assurance - Oak Ridge National Laboratory TRU ALPHA LLWT Project More Documents & Publications

317

CRAD, Radiological Controls - Oak Ridge National Laboratory TRU ALPHA LLWT  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

TRU TRU ALPHA LLWT Project CRAD, Radiological Controls - Oak Ridge National Laboratory TRU ALPHA LLWT Project November 2003 A section of Appendix C to DOE G 226.1-2 "Federal Line Management Oversight of Department of Energy Nuclear Facilities." Consists of Criteria Review and Approach Documents (CRADs) used for a November 2003 assessment of the Radiation Protection Program portion of an Operational Readiness Review of the Oak Ridge National Laboratory TRU ALPHA LLWT Project. CRADs provide a recommended approach and the types of information to gather to assess elements of a DOE contractor's programs. CRAD, Radiological Controls - Oak Ridge National Laboratory TRU ALPHA LLWT Project More Documents & Publications CRAD, Quality Assurance - Oak Ridge National Laboratory TRU ALPHA LLWT

318

Effects of alpha populations on tokamak ballooning stability  

SciTech Connect

Fusion product alpha populations can significantly influence tokamak stability due to coupling between the trapped alpha precessional drift and the kinetic ballooning mode frequency. This effect is of particular importance in parameter regimes where the alpha pressure gradient begins to constitute a sizable fraction of the thermal plasma pressure gradient. Careful, quantitative evaluations of these effects are necessary in burning plasma devices such as the Tokamak Fusion Test Reactor and the Joint European Torus, and we have continued systematic development of such a kinetic stability model. In this model we have considered a range of different forms for the alpha distribution function and the tokamak equilibrium. Both Maxwellian and slowing-down models have been used for the alpha energy dependence while deeply trapped and, more recently, isotropic pitch angle dependence have been examined.

Spong, D.A.; Sigmar, D.J.; Tsang, K.T.; Ramos, J.J.; Hastings, D.E.; Cooper, W.A.

1986-01-01T23:59:59.000Z

319

Interatomic Coulombic decay following Ne 1s Auger decay in NeAr  

SciTech Connect

Using momentum-resolved electron-ion multicoincidence spectroscopy, we have investigated interatomic Coulombic decay (ICD) in the heteronuclear NeAr dimer following Ne 1s Auger decay. The measured intensity ratio for the three ICD transitions Ne{sup 2+}(2s{sup -1}2p{sup -1} {sup 1}P)Ar to Ne{sup 2+}(2p{sup -2} {sup 1}S)-Ar{sup +}(3p{sup -1}), Ne{sup 2+}(2s{sup -1}2p{sup -1} {sup 1}P)Ar to Ne{sup 2+}(2p{sup -2} {sup 1}D)-Ar{sup +}(3p{sup -1}), and Ne{sup 2+}(2s{sup -1}2p{sup -1} {sup 3}P)Ar to Ne{sup 2+}(2p{sup -2} {sup 3}P)-Ar{sup +}(3p{sup -1}) reasonably agree with predictions. The kinetic energy release distribution for the fragmentation to Ne{sup 2+}(2p{sup -2} {sup 1}D)-Ar{sup +}(3p{sup -1}) after the ICD transition from singlet Ne{sup 2+}(2s{sup -1}2p{sup -1} {sup 1}P)Ar state, which is a mirror image of the kinetic energy distribution of the emitted ICD electrons, suggests that the corresponding ICD rate is roughly two times lower than predicted by ab initio calculations.

Ouchi, T.; Sakai, K.; Fukuzawa, H.; Ueda, K. [Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577 (Japan); Higuchi, I.; Tamenori, Y. [Japan Synchrotron Radiation Research Institute, Sayo, Hyogo 679-5198 (Japan); Demekhin, Ph. V.; Chiang, Y.-C.; Stoychev, S. D.; Kuleff, A. I. [Theoretische Chemie, Universitaet Heidelberg, D-69120 Heidelberg (Germany); Mazza, T. [Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577 (Japan); Cimaina and Dipartimento di Fisica, Universita degli Studi di Milano, via Celoria 16, I-20133 Milano (Italy); Schoeffler, M. [Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States); Nagaya, K.; Yao, M. [Department of Physics, Kyoto University, Kyoto 606-8502 (Japan); Saito, N. [National Institute of Advanced Industrial Science and Technology, National Meteorology Institute of Japan, Tsukuba 305-8568 (Japan)

2011-05-15T23:59:59.000Z

320

The molecular biology and biochemistry of rice endosperm. alpha. -globulin  

SciTech Connect

The author's first objective was to isolate a cDNA clone that encodes the rice endosperm {alpha}-globulin. Purified antibodies against a rice storage protein, {alpha}-globulin, were used to screen a {lambda}gt11 cDNA expression library constructed from immature rice seed endosperm. The cDNA insert of clone 4A1 (identified by antibody screening) was used as a probe to identify long cDNA inserts in the library. The deduced amino acid sequence of clone A3-12 cDNA insert (identified by cDNA screening) contained the amino acid sequences of three cyanogen bromide peptides fragment of {alpha}-globulin. The calculated molecular weight and amino acid composition of the deduced amino acid sequence were similar to the {alpha}-globulin protein. Northern blot analysis indicated that mRNA of one size, approximately 1.0 kb, is expressed. Southern genomic blot analysis revealed one band with EcoRI or Hind III digestion. Cell-free translation and immunoprecipitation showed that the initial translation product is approximately 2,000 daltons larger than the mature protein. The amino acid sequence of {alpha}-globulin revealed limited regions of similarities with wheat storage proteins. The author concludes that the cDNA insert in clone A3-12 contained the entire coding region of {alpha}-globulin protein and that {alpha}-globulin is encoded by a single gene. My second objective was to inhibit the degradation of {alpha}-globulin in the salt extract of rice flour. The salt extract of rice flour contained an acid protease whose optimal pH was 3 for {sup 3}H-casein hydrolysis. A polypeptide with molecular weight of 20,000 was immunologically reactive with {alpha}-globulin antibodies and is produced by limited proteolysis in the extract. Pepstatin inhibited the proteolysis of 3H-casein and slowed the proteolysis of {alpha}-globulin.

Shorrosh, B.S.

1989-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "alpha decay suspected" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

Prompt Neutron Decay for Delayed Critical Bare and Natural-Uranium-Reflected Metal Spheres of Plutonium and Highly Enriched Uranium  

Science Conference Proceedings (OSTI)

Prompt neutron decay at delayed criticality was measured by Oak Ridge National Laboratory for uranium-reflected highly enriched uranium (HEU) and Pu metal spheres (FLATTOP), for an unreflected Pu metal (4.5% {sup 240}Pu) sphere (JEZEBEL) at Los Alamos National Laboratory (LANL) and for an unreflected HEU metal sphere at Oak Ridge Critical Experiments Facility. The average prompt neutron decay constants from hundreds of Rossi-{alpha} and randomly pulsed neutron measurements with {sup 252}Cf at delayed criticality are as follows: 3.8458 {+-} 0.0016 x 10{sup 5} s{sup -1}, 2.2139 {+-} 0.0022 x 10{sup 5} s{sup -1}, 6.3126 {+-} 0.0100 x 10{sup 5} s{sup -1}, and 1.1061 {+-} 0.0009 x 10{sup 6} s{sup -1}, respectively. These values agree with previous measurements by LANL for FLATTOP, JEZEBEL, and GODIVA I as follows: 3.82 {+-} 0.02 x 10{sup 5} s{sup -1} for a uranium core; 2.14 {+-} 0.05 x 10{sup 5} s{sup -1} and 2.29 x 10{sup 5} s{sup -1} (uncertainty not reported) for a plutonium core; 6.4 {+-} 0.1 x 10{sup 5} s{sup -1}, and 1.1 {+-} 0.1 x 10{sup 6} s{sup -1}, respectively, but have smaller uncertainties because of the larger number of measurements. For the FLATTOP and JEZEBEL assemblies, the measurements agree with calculations. Traditionally, the calculated decay constants for the bare uranium metal sphere GODIVA I and the Oak Ridge Uranium Metal Sphere were higher than experimental by {approx}10%. Other energy-dependent quantities for the bare uranium sphere agree within 1%.

Mihalczo, John T [ORNL

2011-01-01T23:59:59.000Z

322

Effects of Vacuum Fluctuation Suppression on Atomic Decay Rates  

E-Print Network (OSTI)

The use of atomic decay rates as a probe of sub-vacuum phenomena will be studied. Because electromagnetic vacuum fluctuations are essential for radiative decay of excited atomic states, decay rates can serve as a measure of the suppression of vacuum fluctuation in non-classical states, such as squeezed vacuum states. In such states the renormalized expectation value of the square of the electric field or the energy density can be periodically negative, representing suppression of vacuum fluctuations. We explore the extent to which atomic decays can be used to measure the mean squared electric field or energy density. We consider a scheme in which atoms in an excited state transit a closed cavity whose lowest mode contains photons in a non-classical state. The change in the decay probability of the atom in the cavity due to the non-classical state can, under certain circumstances, serve as a measure of the mean squared electric field or energy density in the cavity. We derive a quantum inequality bound on the ...

Ford, L H

2009-01-01T23:59:59.000Z

323

Beta decay of Neutron-Rich 53-56Ca  

E-Print Network (OSTI)

Beta-decay properties of neutron-rich Ca isotopes have been obtained. Half-life values were determined for the first time for 54Ca [86(7) ms], 55Ca [22(2) ms], and 56Ca [11(2) ms]. The half-life of 230(6) ms deduced for 53Ca is significantly longer than reported previously, where the decay chain 53K -> 53Ca -> 53Sc was considered. A delayed gamma ray with energy 247 keV as identified following beta decay of 54Ca, and is proposed to depopulate the first 1+ level in 54Sc. The beta-decay properties compare favorably with the results of shell model calculations completed in the full pf-space with the GXPF1 interaction. The half-lives of the neutron-rich Ca isotopes are also compared with gross beta-decay theory. The systematic trend of the neutron-rich Ca half-lives is consistent with the presence of a subshell gap at N=32.

P. F. Mantica; R. Broda; H. L. Crawford; A. Damaske; B. Fornal; A. A. Hecht; C. Hoffman; M. Horoi; N. Hoteling; R. V. F. Janssens; J. Pereira; J. S. Pinter; J. B. Stoker; S. L. Tabor; T. Sumikama; W. B. Walters; X. Wang; S. Zhu

2008-01-07T23:59:59.000Z

324

Beta decay of Neutron-Rich 53-56Ca  

E-Print Network (OSTI)

Beta-decay properties of neutron-rich Ca isotopes have been obtained. Half-life values were determined for the first time for 54Ca [86(7) ms], 55Ca [22(2) ms], and 56Ca [11(2) ms]. The half-life of 230(6) ms deduced for 53Ca is significantly longer than reported previously, where the decay chain 53K -> 53Ca -> 53Sc was considered. A delayed gamma ray with energy 247 keV as identified following beta decay of 54Ca, and is proposed to depopulate the first 1+ level in 54Sc. The beta-decay properties compare favorably with the results of shell model calculations completed in the full pf-space with the GXPF1 interaction. The half-lives of the neutron-rich Ca isotopes are also compared with gross beta-decay theory. The systematic trend of the neutron-rich Ca half-lives is consistent with the presence of a subshell gap at N=32.

Mantica, P F; Crawford, H L; Damaske, A; Fornal, B; Hecht, A A; Hoffman, C; Horoi, M; Hoteling, N; Janssens, R V F; Pereira, J; Pinter, J S; Stoker, J B; Tabor, S L; Sumikama, T; Walters, W B; Wang, X; Zhu, S

2008-01-01T23:59:59.000Z

325

Geological evolution and analysis of confirmed or suspected gas hydrate localities. Volume 5. Gas hydrates in the Russian literature. [271 references  

Science Conference Proceedings (OSTI)

This document is Volume V of a series of reports entitled ''Geological Evolution and Analysis of Confirmed or Suspected Gas Hydrate Localities.'' Volume V is an analysis of ''Gas Hydrates in the Russian Literature.'' This report presents an assessment of gas hydrate research as documented in Russian literature. It presents material that includes regional and local settings, geological history, stratigraphy, and physical properties. It provides some necessary regional and geological background of major hydrate occurrences in Russia. This report provides a better understanding of the gas hydrate phenomena in Russia and gives a detailed account of gas production history from a gas hydrate field in Siberia. It provides an important assessment of the understanding of gas hydrate deposition and production. 271 refs., 51 figs., 19 tabs.

Krason, J.; Ciesnik, M.

1985-10-01T23:59:59.000Z

326

Direct measurement of the {sup 18}F(p,{alpha}){sup 15}O reaction at nova temperatures  

SciTech Connect

The {sup 18}F(p,{alpha}){sup 15}O reaction rate is crucial for understanding the final abundance of {sup 18}F predicted by nova models. The {gamma}-ray emission in the first few hours after a nova outburst is expected to be dominated by 511 keV annihilation photons from the decay of {sup 18}F, and so understanding its production can provide important constraints on the conditions during the outburst when compared with observations. Results are presented from the lowest-energy direct measurement to date, performed at the Isotope Separator and Accelerator radioactive beam facility at the TRIUMF laboratory, Canada. Cross section measurements at center-of-mass energies of 250, 330, 453, and 673 keV are obtained and the results compared to previous data and R-matrix calculations. The implications for the overall reaction rate in the context of nova explosions have been discussed.

Beer, C. E.; Laird, A. M.; Bentley, M. A.; Diget, C. A.; Fox, S. P.; Fulton, B. R. [Department of Physics, University of York, York YO10 5DD (United Kingdom); Murphy, A. St. J.; Davinson, T.; Salter, P. [SUPA, School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3JZ (United Kingdom); Buchman, L.; Davids, B.; Hager, U.; Howell, D.; Martin, L.; Ruiz, C.; Ruprecht, G.; Vockenhuber, C.; Walden, P. [TRIUMF, Vancouver, British Columbia V6T 2A3 (Canada)

2011-04-15T23:59:59.000Z

327

Some numerical reslts on best uniform polynomial approximation of {chi}{sup {alpha}} on [0,1  

SciTech Connect

Let {alpha} be a positive number, and let E{sub n}(chi{sup {alpha}}; [0,1]) denote the error of best uniform approximation to {chi}{sup {alpha}}, by polynomials of degree at most n, on the interval [0,1]. The Russian mathematician S.N. Bernstein established the existence of a nonnegative constant {Beta}({alpha}) such that {Beta}({alpha}):= {sub n{yields}{infinity}lim(2n){sup 2{alpha}}E{sub n}({chi}{sup {alpha}};[0.1]). In addition, Bernstein showed that {Beta}{alpha} < {Gamma}(2{alpha}){vert_bar}sin(pi}{alpha}){vert_bar}/{pi} ({alpha} > 0) and that {Gamma}(2{alpha}){vert_bar}sin({pi}{alpha}){vert_bar}/{pi} (1{minus}1/2{alpha}{minus}1) < {Beta}({alpha}) ({alpha} > {1/2}), so that the asymptotic behavior of {Beta}({alpha}) is known when {alpha}{yields}{infinity}. Still, the problem of trying to determine {Beta}({alpha}) more precisely, for all {alpha} > 0, is intriguing. To this end, we have rigorously determined the numbers for thirteen values of {alpha}, where these numbers were calculated with a precision of at least 200 significant digits. For each of these thirteen values of {alpha}, Richardson`s extrapolation was applied to the products to obtain estimates of {Beta}({alpha}) to approximately 40 decimal places. Included are graphs of the points ({alpha},{Beta}({alpha})) for the thirteen values of {alpha} that we considered.

Carpenter, A.J.; Varga, R.S.

1992-07-01T23:59:59.000Z

328

Updated measurements of hadronic B decays at CDF  

SciTech Connect

The CDF experiment at the Tevatron p{bar p} collider established that extensive and detailed exploration of the b-quark dynamics is possible in hadron collisions, with results competitive and supplementary to those from e{sup +}e{sup -} colliders. This provides a rich, and highly rewarding program that has currently reached full maturity. In the following I report some recent results on hadronic decays: the evidence for the charmless annihilation decay mode B{sub s}{sup 0} {yields} {pi}{sup +}{pi}{sup -}, and the first reconstruction in hadron collisions of the suppressed decays B{sup -} {yields} D({yields} K{sup +}{pi}{sup 0})K{sup -} and B{sup -} {yields} D({yields} K{sup +} {pi}{sup -}){pi}{sup -}.

Morello, Michael J.

2012-01-01T23:59:59.000Z

329

Charmonium Decays to Axial-Vector Plus Pseudoscalar Mesons  

SciTech Connect

A sample of 3.79{times}10{sup 6} {psi}(2S) events is used to study the decays of charmonium to axial-vector plus pseudoscalar mesons. The branching fraction for the decay {psi}(2S){r_arrow}b{sup {plus_minus}}{sub 1} (1235){pi}{sup {minus_plus}} agrees with expectations based on scaling the corresponding J/{psi} branching fraction. Flavor-SU(3)-violating K{sub 1}(1270) -K{sub 1}(1400) asymmetries with opposite character for {psi}(2S) and J/{psi} decays are observed. This contrasting behavior cannot be accommodated by adjustments of the singlet-triplet mixing angle. {copyright} {ital 1999} {ital The American Physical Society}

Bai, J.Z.; Bian, J.G.; Chen, G.P.; Chen, J.C.; Chen, Y.; Chen, Y.B.; Chen, Y.Q.; Cheng, B.S.; Cui, X.Z.; Ding, H.L.; Dong, L.Y.; Du, Z.Z.; Gao, C.S.; Gao, M.L.; Gao, S.Q.; Gu, J.H.; Gu, S.D.; Gu, W.X.; Gu, Y.F.; Guo, Y.N.; Han, S.W.; Han, Y.; He, J.; He, J.T.; He, K.L.; Hu, G.Y.; Hu, H.M.; Hu, J.L.; Hu, Q.H.; Hu, T.; Hu, X.Q.; Huang, Y.Z.; Jiang, C.H.; Jin, Y.; Ke, Z.J.; Lai, Y.F.; Lang, P.F.; Li, C.G.; Li, D.; Li, H.B.; Li, J.; Li, P.Q.; Li, R.B.; Li, W.; Li, W.G.; Li, X.H.; Li, X.N.; Liu, H.M.; Liu, J.; Liu, R.G.; Liu, Y.; Lu, F.; Lu, J.G.; Luo, X.L.; Ma, E.C.; Ma, J.M.; Mao, H.S.; Mao, Z.P.; Meng, X.C.; Nie, J.; Qi, N.D.; Qi, X.R.; Qiu, J.F.; Qu, Y.H.; Que, Y.K.; Rong, G.; Shao, Y.Y.; Shen, B.W.; Shen, D.L.; Shen, H.; Shen, X.Y.; Sheng, H.Y.; Shi, H.Z.; Song, X.F.; Sun, F.; Sun, H.S.; Sun, Y.; Sun, Y.Z.; Tang, S.Q.; Tong, G.L.; Wang, F.; Wang, L.S.; Wang, L.Z.; Wang, M.; Wang, P.; Wang, P.L.; Wang, S.M.; Wang, T.J.; Wang, Y.Y.; Wei, C.L.; Wu, Y.G.; Xi, D.M.; Xia, X.M.; Xie, P.P.; Xie, Y.; Xie, Y.H.; Xu, G.F.; Xue, S.T.; Yan, J.; Yan, W.G.; Yang, C.M.; Yang, C.Y.; Yang, J.; Yang, X.F.; Ye, M.H.; Yu, C.S.; Yu, C.X.; Yu, G.W.; Yu, Z.Q.; Yuan, C.Z.; Yuan, Y.; Zhang, B.Y.; Zhang, C.C.; Zhang, D.H.; Zhang, D.; Zhang, H.L.; Zhang, J.; Zhang, J.W.; Zhang, L.S.; Zhang, Q.J.; Zhang, S.Q.; Zhang, Y.Y.; Zhao, D.X.; Zhao, H.W.; Zhao, J.W.; Zhao, M.; Zhao, W.R.; Zhao, Z.G.; Zheng, J.P.; Zheng, L.S.; Zheng, Z.P.; Zhou, B.Q.; Zhou, G.P.; Zhou, H.S.; Zhou, L.; Zhu, K.J.; Zhu, Q.M.; Zhu, Y.C.; Zhu, Y.S.; Zhuang, B.A. [Institute of High Energy Physics, Beijing 100039, People`s Republic of (China)] [Institute of High Energy Physics, Beijing 100039, People`s Republic of (China); Hitlin, D.G.; Kelsey, M.H.; Oyang, J.; Panetta, J.; Porter, F.; Weaver, M. [California Institute of Technology, Pasadena, California 91125 (United States)] [California Institute of Technology, Pasadena, California 91125 (United States); Chen, J.; Malchow, R.; Toki, W.; Yang, W. [Colorado State University, Fort Collins, Colorado 80523 (United States)] [Colorado State University, Fort Collins, Colorado 80523 (United States); Yu, Y.H. [Hangzhou Unv., Hangzhou 310028, People`s Republic of (China)] [Hangzhou Unv., Hangzhou 310028, People`s Republic of (China); Ban, Y. [Peking Unv. (China)] [Peking Unv. (China)

1999-09-01T23:59:59.000Z

330

Evidence for the decay X(3872) -> J/\\psi\\omega  

SciTech Connect

We present a study of the decays B{sup 0,+} --> J/{psi}{pi}{sup +}{pi}{sup -}{pi}{sup 0}K{sup 0,+}, using 467x10{sup 6} B{anti B} pairs recorded with the BABAR detector. We present evidence for the decay mode X(3872) --> J/{psi}{omega}, with product branching fractions B(B{sup +} --> X(3872)K{sup +}) x B(X(3872) --> J/{psi}{omega}) = [0.6 {+-} 0.2(stat) {+-} 0.1(syst)] x 10{sup -5}, and B(B{sup 0} --> X(3872)K{sup 0}) x B(X(3872) --> J/{psi}{omega}) = [0.6 {+-} 0.3(stat) {+-} 0.1(syst)] x 10{sup -5}. A detailed study of the {pi}{sup +}{pi}{sup -}{pi}{sup 0} mass distribution from X(3872) decay favors a negative-parity assignment.

del Amo Sanchez, P.; Lees, J.P.; Poireau, V.; Prencipe, E.; Tisserand, V.; /Annecy, LAPP; Garra Tico, J.; Grauges, E.; /Barcelona U., ECM; Martinelli, M.; Palano, A.; Pappagallo, M.; /INFN, Bari /Bari U.; Eigen, G.; Stugu, B.; Sun, L.; /Bergen U.; Battaglia, M.; Brown, D.N.; Hooberman, B.; Kerth, L.T.; Kolomensky, Yu.G.; Lynch, G.; Osipenkov, I.L.; Tanabe, T.; /UC, Berkeley /Birmingham U. /Ruhr U., Bochum /British Columbia U. /Brunel U. /Novosibirsk, IYF /UC, Irvine /UC, Riverside /UC, Santa Barbara /UC, Santa Cruz /Caltech /Cincinnati U. /Colorado U. /Colorado State U. /Dortmund U. /Dresden, Tech. U. /Ecole Polytechnique /Edinburgh U. /INFN, Ferrara /Ferrara U. /INFN, Ferrara /INFN, Ferrara /Ferrara U. /INFN, Ferrara /Frascati /INFN, Genoa /Genoa U. /INFN, Genoa /INFN, Genoa /Genoa U. /INFN, Genoa /INFN, Genoa /Genoa U. /Indian Inst. Tech., Guwahati /Harvard U. /Heidelberg U. /Humboldt U., Berlin /Imperial Coll., London /Iowa State U. /Iowa State U. /Johns Hopkins U. /Paris U., VI-VII /LLNL, Livermore /Liverpool U. /Queen Mary, U. of London /Royal Holloway, U. of London /Royal Holloway, U. of London /Louisville U. /Mainz U., Inst. Kernphys. /Manchester U. /Maryland U. /Massachusetts U., Amherst /MIT /McGill U. /INFN, Milan /Milan U. /INFN, Milan /INFN, Milan /Milan U. /Mississippi U. /Montreal U. /INFN, Naples /Naples U. /NIKHEF, Amsterdam /NIKHEF, Amsterdam /Notre Dame U. /Ohio State U. /Oregon U. /INFN, Padua /Padua U. /INFN, Padua /INFN, Padua /Padua U. /Paris U., VI-VII /INFN, Perugia /Perugia U. /INFN, Pisa /Pisa U. /INFN, Pisa /Pisa, Scuola Normale Superiore /INFN, Pisa /Pisa U. /INFN, Pisa /Princeton U. /INFN, Rome /INFN, Rome /Rome U. /INFN, Rome /INFN, Rome /Rome U. /INFN, Rome /INFN, Rome /Rome U. /INFN, Rome /INFN, Rome /Rome U. /Rostock U. /Rutherford /DAPNIA, Saclay /SLAC /South Carolina U. /Southern Methodist U. /Stanford U., Phys. Dept. /SUNY, Albany /Tel Aviv U. /Tennessee U. /Texas U. /Texas U., Dallas /INFN, Turin /Turin U. /INFN, Trieste /Trieste U. /Valencia U. /Victoria U. /Warwick U. /Wisconsin U., Madison

2011-08-11T23:59:59.000Z

331

Decays of electron Bernstein waves near plasma edge  

Science Conference Proceedings (OSTI)

Nonlinear wave-wave couplings near the upper hybrid resonance are studied via particle-in-cell simulations. It is found that the decay of an electron Bernstein wave (EBW) depends on the ratio of the incident frequency and electron cyclotron frequency. For ratios less than two, parametric decay into a lower hybrid wave (or an ion Bernstein wave) and EBWs at a lower frequency is observed. For ratios larger than two, the daughter waves could be an electron cyclotron quasi-mode and another EBW or an ion wave and EBW. For sufficiently high incident power, the former process may dominate. Because of the electron cyclotron quasi-mode, electrons can be strongly heated by nonlinear Landau damping. As a result, the bulk of the incident power can be absorbed near plasma edge at high power. The increase in number of decay channels with frequency implies that the allowable power into the plasma must decrease with frequency.

Xiang Nong [Institute of Plasma Physics, CAS, Hefei, Anhui 230031 (China); Center for Integrated Plasma Studies, University of Colorado at Boulder, Boulder, Colorado 80309 (United States); Cary, John R. [Center for Integrated Plasma Studies, University of Colorado at Boulder, Boulder, Colorado 80309 (United States); Tech-X Corporation, Boulder, Colorado 80303 (United States)

2011-12-15T23:59:59.000Z

332

Agent Tcl: Alpha Release 1.1  

E-Print Network (OSTI)

Agent Tcl is a transportable agent system. The agents are written in an extended version of the Tool Command Lanuage (Tcl). Each agent can suspend its execution at an arbitrary point, transport to another machine and resume execution on the new machine. This migration is accomplished with the agent jump command. agent jump captures the current state of the Tcl script and transfers this state to the destination machine. The state is restored on the new machine and the Tcl script continues its execution from the command immediately after the agent jump. In addition to migration, agents can send messages to each other and can establish direct connections. A direct connection is more efficient than message passing for bulk data transfer. Finally, agents can use the Tk toolkit to create graphical user interfaces on their current machine. Agent Tcl is implemented as two components. The first component is an extended Tcl interpreter. The second component is a server which runs on each machine. The server accepts incoming agents, messages and connection requests and keeps track of the agents that are running on its machine. An alpha release of Agent Tcl is available for public use. This documentation describes how to obtain and compile the source code, how to run the server and how to write transportable agents.

Robert Gray Department; Robert S. Gray

1995-01-01T23:59:59.000Z

333

1. LEARNING FROM THE PIPER ALPHA  

E-Print Network (OSTI)

people and cost billions of dollars in property damage. It was caused by a massive fire, which was not the result of an unpredictable act of God but of an accumulation of errors and questionable decisions. Most of them were rooted in the organization, its structure, procedures, and culture. This paper analyzes the accident scenario using the risk analysis framework, determines which human decision and actions influenced the occurrence of the basic events, and then identifies the organizational roots of these decisions and actions. These organizational factors are generalizable to other industries and engineering systems. They include flaws in the design guidelines and design practices (e.g., tight physical couplings or insufficient redundancies), misguided priorities in the management of the tradeoff between productivity and safety, mistakes in the management of the personnel on board, and errors of judgment in the process by which financial pressures are applied on the production sector (i.e., the oil companies definition of profit centers) resulting in deficiencies in inspection and maintenance operations. This analytical approach allows identification of risk management measures that go beyond the purely technical (e.g., add redundancies to a safety system) and also include improvements of management practices. KEY WORDS: Piper Alpha accident; offshore platforms; human error; organizational errors; postmortem analysis; probabilistic risk analysis.

M. Elisabeth Patc-cornell

1992-01-01T23:59:59.000Z

334

H{alpha} ABSORPTION IN TRANSITING EXOPLANET ATMOSPHERES  

SciTech Connect

Absorption of stellar H{alpha} by the upper atmosphere of the planet HD 189733b has recently been detected by Jensen et al. Motivated by this observation, we have developed a model for atomic hydrogen in the n = 2 state and compared the resulting H{alpha} line profile to the observations. The model atmosphere is in hydrostatic balance, as well as thermal and photoionization equilibrium. Collisional and radiative transitions are included in the determination of the n = 2 state level population. We find that H{alpha} absorption is dominated by an optical depth {tau} {approx} 1 shell, composed of hydrogen in the metastable 2s state that is located below the hydrogen ionization layer. The number density of the 2s state within the shell is found to vary slowly with radius, while that of the 1s state falls rapidly. Thus while the Ly{alpha} absorption, for a certain wavelength, occurs inside a relatively well defined impact parameter, the contribution to H{alpha} absorption is roughly uniform over the entire atomic hydrogen layer. The model can approximately reproduce the observed Ly{alpha} and H{alpha} integrated transit depths for HD 189733b by using an ionization rate enhanced over that expected for the star by an order of magnitude. For HD 209458b, we are unable to explain the asymmetric H{alpha} line profile observed by Jensen et al., as the model produces a symmetric line profile with transit depth comparable to that of HD 189733b. In an appendix, we study the effect of the stellar Ly{alpha} absorption on the net cooling rate.

Christie, Duncan; Arras, Phil; Li Zhiyun, E-mail: dac5zm@virginia.edu, E-mail: pla7y@virginia.edu, E-mail: zl4h@virginia.edu [Department of Astronomy, University of Virginia, P.O. Box 400325, Charlottesville, VA 22904-4325 (United States)

2013-08-01T23:59:59.000Z

335

Precision Measurements of Tau Lepton Decays  

SciTech Connect

Using data collected with the BABAR detector at the SLAC PEP-II electron-positron storage ring operating at a center-of-mass energy near 10.58 GeV, the branching fractions {Beta}({tau}{sup -} {yields} {pi}{sup -}{pi}{sup -}{pi}{sup +}{nu}{sub {tau}}) = (8.83 {+-} 0.01 {+-} 0.13)%, {Beta}({tau}{sup -} {yields} K{sup -}{pi}{sup -}{pi}{sup +}{nu}{sub {tau}}) = (0.273 {+-} 0.002 {+-} 0.009)%, {Beta}({tau}{sup -} {yields} K{sup -}{pi}{sup -}K{sup +}{nu}{sub {tau}}) = (0.1346 {+-} 0.0010 {+-} 0.0036)%, and {Beta}({tau}{sup -} {yields} K{sup -}K{sup -}K{sup +}{nu}{sub {tau}}) = (1.58 {+-} 0.13 {+-} 0.12) x 10{sup -5} are measured where the uncertainties are statistical and systematic, respectively. The invariant mass distribution for the {tau}{sup -} {yields} {pi}{sup -}{pi}{sup -}{pi}{sup +}{nu}{sub {tau}} {yields} K{sup -}{pi}{sup -}{pi}{sup +}{nu}{sub {tau}}, {tau}{sup -} {yields} K{sup -}{pi}{sup -}K{sup +}{nu}{sub {tau}} and {tau}{sup -} {yields} K{sup -}K{sup -}K{sup +}{nu}{sub {tau}} decays are unfolded to correct for detector effects. A measurement of {Beta}({tau}{sup -} {yields} {phi}{pi}{sup -}{nu}{sub {tau}}) = (3.42 {+-} 0.55 {+-} 0.25) x 10{sup -5}, a measurement of {Beta}({tau}{sup -} {yields} {phi}K{sup -}{nu}{sub {tau}}) = (3.39 {+-} 0.20 {+-} 0.28) x 10{sup -5} and an upper limit on {Beta}({tau}{sup -} {yields} K{sup -}K{sup -}K{sup +}{nu}{sub {tau}}[ex.{phi}]) {le} 2.5 x 10{sup -6} {at} 905 CL are determined from a binned maximum likelihood fit of the {tau}{sup -} {yields} K{sup -}{pi}{sup -}K{sup +}{nu}{sub {tau}} and {tau}{sup -} {yields} K{sup -}K{sup -}K{sup +}{nu}{sub {tau}} K{sup +}K{sup -} invariant mass distributions. The branching ratio {Beta}({tau}{sup -} {yields} K{sup -}{nu}{sub {tau}})/{Beta}({tau}{sup -} {yields} {pi}{sup -}{nu}{sub {tau}}) is measured to be (6.531 {+-} 0.056 {+-} 0.093) x 10{sup -2} from which |V{sub us}| is determined to be 0.2255 {+-} 0.0023. The branching ratio {Beta}/({tau}{sup -} {yields} {mu}{nu}{sub {tau}}{bar {nu}}{sub {mu}})/{Beta}({tau}{sup -} {yields} e{sup -} {nu}{sub {tau}}{bar {nu}}{sub e}) = (9.796 {+-} 0.016 {+-} 0.035) x 10{sup -1} is measured enabling a precision test of the Standard Model assumption of charged current lepton universality, g{sub {mu}}/g{sub e} = 1.0036 {+-} 0.0020. The branching ratios {Beta}({tau}{sup -} {yields} K{sup -}{nu}{sub {tau}})/{Beta}({tau}{sup -} {yields} e{sup -}{nu}{sub {tau}}{bar {nu}}{sub e}) = (3.882 {+-} 0.032 {+-} 0.057) x 10{sup -2}, and {Beta}({tau}{sup -} {yields} {pi}{sup -}{nu}{sub {tau}})/{Beta}({tau}{sup -} {yields} e{nu}{sub {tau}}{bar {nu}}{sub e}) = (5.9545 {+-} 0.014 {+-} 0.061) x 10{sup -1} are measured which provide additional tests of charged current lepton universality, (g{sub {tau}}/g{sub {mu}}){sub {pi}} = 0.9856 {+-} 0.0057 and (g{sub {tau}}/g{sub {mu}}){sub K} = 0.9827 {+-} 0.0086 which can be combined to give (g{sub {tau}}/g{sub {mu}}){sub {pi}/K} = 0.9850 {+-} 0.0054. Any deviation of these measurements from the expected Standard Model values would be an indication of new physics.

Nugent, Ian M.; /Victoria U.

2010-03-16T23:59:59.000Z

336

Particle Physics Aspects of Antihydrogen Studies with ALPHA at CERN  

E-Print Network (OSTI)

We discuss aspects of antihydrogen studies, that relate to particle physics ideas and techniques, within the context of the ALPHA experiment at CERN's Antiproton Decelerator facility. We review the fundamental physics motivations for antihydrogen studies, and their potential physics reach. We argue that initial spectroscopy measurements, once antihydrogen is trapped, could provide competitive tests of CPT, possibly probing physics at the Planck Scale. We discuss some of the particle detection techniques used in ALPHA. Preliminary results from commissioning studies of a partial system of the ALPHA Si vertex detector are presented, the results of which highlight the power of annihilation vertex detection capability in antihydrogen studies.

Fujiwara, M C; Bertsche, W; Bowe, P D; Bray, C C; Butler, E; Cesar, C L; Chapman, S; Charlton, M; Fajans, J; Funakoshi, R; Gill, D R; Hangst, J S; Hardy, W N; Hayano, R S; Hayden, M E; Humphries, A J; Hydomako, R; Jenkins, M J; Jrgensen, L V; Kurchaninov, L; Lai, W; Lambo, R; Madsen, N; Nolan, P; Olchanski, K; Olin, A; Povilus, A; Pusa, P; Robicheaux, F; Sarid, E; Seif El Nasr, S; Silveira, D M; Storey, J W; Thompson, R I; Van der Werf, D P; Wasilenko, L; Wurtele, J S; Yamazaki, Y

2008-01-01T23:59:59.000Z

337

Selective flow path alpha particle detector and method of use  

DOE Patents (OSTI)

A method and apparatus for monitoring alpha contamination are provided in which ions generated in the air surrounding the item, by the passage of alpha particles, are moved to a distant detector location. The parts of the item from which ions are withdrawn can be controlled by restricting the air flow over different portions of the apparatus. In this way, detection of internal and external surfaces separately, for instance, can be provided. The apparatus and method are particularly suited for use in undertaking alpha contamination measurements during the commissioning operations.

Orr, Christopher Henry (Sellafield, Seascale, Cumbria, GB); Luff, Craig Janson (Sellafield, Seascale, Cumbria, GB); Dockray, Thomas (Sellafield, Seascale, Cumbria, GB); Macarthur, Duncan Whittemore (P.O. Box 1663, Los Alamos, NM 87545)

2002-01-01T23:59:59.000Z

338

Single and double grid long-range alpha detectors  

DOE Patents (OSTI)

Alpha particle detectors capable of detecting alpha radiation from distant sources. In one embodiment, a voltage is generated in a single electrically conductive grid while a fan draws air containing air molecules ionized by alpha particles through an air passage and across the conductive grid. The current in the conductive grid can be detected and used for measurement or alarm. Another embodiment builds on this concept and provides an additional grid so that air ions of both polarities can be detected. The detector can be used in many applications, such as for pipe or duct, tank, or soil sample monitoring.

MacArthur, Duncan W. (Los Alamos, NM); Allander, Krag S. (Ojo Caliente, NM)

1993-01-01T23:59:59.000Z

339

Single and double grid long-range alpha detectors  

DOE Patents (OSTI)

Alpha particle detectors capable of detecting alpha radiation from distant sources. In one embodiment, a voltage is generated in a single electrically conductive grid while a fan draws air containing air molecules ionized by alpha particles through an air passage and across the conductive grid. The current in the conductive grid can be detected and used for measurement or alarm. Another embodiment builds on this concept and provides an additional grid so that air ions of both polarities can be detected. The detector can be used in many applications, such as for pipe or duct, tank, or soil sample monitoring.

MacArthur, D.W.; Allander, K.S.

1993-03-16T23:59:59.000Z

340

Can the beta decay of neutral kaons be observed?  

E-Print Network (OSTI)

The rate of the beta decay of neutral kaons is calculated within the meson dominance approach taking into account the relation between the KK\\rho and \\pi\\pi\\rho coupling constants which follows from the vector meson dominance in electromagnetic interactions and isospin symmetry. The decay rate transforms into the following branching fraction summed over the charge states indicated: B(K0L -> K+- e-+ nu)=(2.53+-0.10)x10^{-9}. The error is dominated by our estimate of isospin violating effects. Experimental aspects of such a measurement are discussed.

Peter Lichard; Julia Thompson

2000-04-25T23:59:59.000Z

Note: This page contains sample records for the topic "alpha decay suspected" from the National Library of EnergyBeta (NLEBeta).
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341

Computer simulations of the motion and decay of global strings  

Science Conference Proceedings (OSTI)

Computer simulations have been carried out of the motion and decay of global strings, including spectrum analysis of the energy stored in the scalar field which describes the global string and the radiated Nambu-Goldstone bosons. We simulated relaxing pieces of bent string and collapsing loops. We find, for the string sizes investigated, that the spectrum of field energy hardens rather than softens while the string decays into Nambu-Goldstone radiation. We argue on theoretical grounds that is indeed the most plausible general behaviour. 19 refs., 12 figs.

Hagmann, C.; Sikivie, P.

1990-01-01T23:59:59.000Z

342

Determining the Energy Barrier for Decay out of Superdeformed Bands  

E-Print Network (OSTI)

An asymptotically exact quantum mechanical calculation of the matrix elements for tunneling through an asymmetric barrier is combined with the two-state statistical model for decay out of superdeformed bands to determine the energy barrier (as a function of spin) separating the superdeformed and normal-deformed wells for several nuclei in the 190 and 150 mass regions. The spin-dependence of the barrier leading to sudden decay out is shown to be consistent with the decrease of a centrifugal barrier with decreasing angular momentum. Values of the barrier frequency in the two mass regions are predicted.

B. R. Barrett; J. Brki; D. M. Cardamone; C. A. Stafford; D. L. Stein

2008-09-06T23:59:59.000Z

343

Brief report on `Radiative $\\phi$ decays with derivative interactions'  

E-Print Network (OSTI)

We study the line shapes of radiative $\\phi$-decays with a direct coupling of the $\\phi$ meson to the $f_{0}(980)$ and $a_{0}(980)$ scalar mesons. The latter couple via derivative interactions to $\\pi_0 \\pi_0$ and $\\pi_0 \\eta$, respectively. Although the kaon-loop mechanism is usually regarded as the dominant mechanism in radiative $\\phi$ decays, here we test a different possibility: we set the kaon-loop to zero and we fit the theoretical curves to the data by retaining only the direct coupling. Remarkably, satisfactory fits can be achieved, mainly due to the effects of derivative interactions of scalar with pseudoscalar mesons.

Giacosa, F

2008-01-01T23:59:59.000Z

344

Decay modes of $^{10}$C nuclei unbound state  

E-Print Network (OSTI)

Unbound states of $^{10}$C nuclei produced as quasi-projectiles in $^{12}$C+$^{24}$Mg collisions at E/A = 53 and 95 MeV are studied with the Indra detector array. Multi-particle correlation function analyses provide experimental evidence of sequential de-excitation mechanisms through the production of intermediate $^{9}$B, $^{6}$Be and $^{8}$Be unbound nuclei. The relative contributions of different decay sequences to the total decay width of the explored states is estimated semi-quantitatively. The obtained results show that heavy-ion collisions can be used as a tool to access spectroscopic information about exotic nuclei.

F. Grenier; A. Chbihi; R. Roy; G. Verde; D. Thriault; J. D. Frankland; J. P. Wieleczko; B. Borderie; R. Bougault; R. Dayras; E. Galichet; D. Guinet; P. Lautesse; N. Le Neindre; O. Lopez; J. Moisan; L. Nalpas; M. Prlog; M. F. Rivet; E. Rosato; B. Tamain; E. Vient; M. Vigilante

2007-06-29T23:59:59.000Z

345

New Limit on Time-Reversal Violation in Beta Decay  

Science Conference Proceedings (OSTI)

We report the results of an improved determination of the triple correlation DP{center_dot}(p{sub e}xp{sub v}) that can be used to limit possible time-reversal invariance in the beta decay of polarized neutrons and constrain extensions to the standard model. Our result is D=[-0.96{+-}1.89(stat){+-}1.01(sys)]x10{sup -4}. The corresponding phase between g{sub A} and g{sub V} is {phi}{sub AV}=180.013 deg. {+-}0.028 deg. (68% confidence level). This result represents the most sensitive measurement of D in nuclear {beta} decay.

Mumm, H. P. [National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States); CENPA and Physics Department, University of Washington, Seattle, Washington 98195 (United States); Chupp, T. E.; Cooper, R. L.; Coulter, K. P. [Physics Department, University of Michigan, Ann Arbor, Michigan, 48104 (United States); Freedman, S. J.; Fujikawa, B. K. [Physics Department, University of California at Berkeley and Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States); Garcia, A. [CENPA and Physics Department, University of Washington, Seattle, Washington 98195 (United States); Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556 (United States); Jones, G. L. [Physics Department, Hamilton College, Clinton, New York 13323 (United States); Nico, J. S.; Thompson, A. K. [National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States); Trull, C. A.; Wietfeldt, F. E. [Physics Department, Tulane University, New Orleans, Louisiana 70118 (United States); Wilkerson, J. F. [Department of Physics and Astronomy, University of North Carolina, Chapel Hill, North Carolina 27599 (United States); CENPA and Physics Department, University of Washington, Seattle, Washington 98195 (United States)

2011-09-02T23:59:59.000Z

346

A Search for Neutrinoless Tau Decays to Three Leptons  

SciTech Connect

Using approximately 350 million {tau}{sup +}{tau}{sup -} pair events recorded with the BaBar detector at the Stanford Linear Accelerator Center between 1999 and 2006, a search has been made for neutrinoless, lepton-flavor violating tau decays to three lighter leptons. All six decay modes consistent with conservation of electric charge and energy have been considered. With signal selection efficiencies of 5-12%, we obtain 90% confidence level upper limits on the branching fraction {Beta}({tau} {yields} {ell}{ell}{ell}) in the range (4-8) x 10{sup -8}.

Kolb, Jeffrey A.; /Oregon U. /SLAC

2008-09-24T23:59:59.000Z

347

Time-resolved fluorescence decay measurements for flowing particles  

DOE Patents (OSTI)

Time-resolved fluorescence decay measurements are disclosed for flowing particles. An apparatus and method for the measurement and analysis of fluorescence for individual cells and particles in flow are described, wherein the rapid measurement capabilities of flow cytometry and the robust measurement and analysis procedures of time-domain fluorescence lifetime spectroscopy are combined. A pulse-modulated CW laser is employed for excitation of the particles. The characteristics and the repetition rate of the excitation pulses can be readily adjusted to accommodate for fluorescence decays having a wide range of lifetimes. 12 figs.

Deka, C.; Steinkamp, J.A.

1999-06-01T23:59:59.000Z

348

Search for CP Violation using T-odd Correlations in D+ to K+K0spi+pi- and DS+ to K+K0spi+pi- Decays  

SciTech Connect

We search for CP violation in a sample of 20,000 Cabibbo-suppressed decays, D{sup +} {yields} K{sup +}K{sub S}{sup 0}{pi}{sup +}{pi}{sup -}, and 30,000 Cabibbo-favored decays, D{sub s}{sup +} {yields} K{sup +}K{sub S}{sup 0}{pi}{sup +}{pi}{sup -}. We use 520 fb{sup -1} of data recorded by the BABAR detector at the PEP-II asymmetric-energy e{sup +}e{sup -} collider operating at center of mass energies near 10.6 GeV. We search for CP violation in the difference between the T-odd asymmetries obtained using triple product correlations of the D+ (D{sub s}{sup +}) and D{sup -} (D{sub s}{sup -}) decays, respectively. The T violation parameter values obtained are {Alpha}{sub T} (D{sup +}) = (-12.0 {+-} 10.0{sub stat} {+-} 4.6{sub syst}) x 10{sup -3} and {Alpha}{sub T}(D{sub s}{sup +}) = (-13.6 {+-} 7.7{sub stat} {+-} 3.4{sub syst}) x 10{sup -3}, which are consistent with the Standard Model expectations.

Lees, J.P.; Poireau, V.; Tisserand, V.; /Annecy, LAPP; Garra Tico, J.; Grauges, E.; /Barcelona U., ECM; Martinelli, M.; /INFN, Bari /Bari U.; Milanes, D.A.; /INFN, Bari; Palano, A.; Pappagallo, M.; /INFN, Bari /Bari U.; Eigen, G.; Stugu, B.; Sun, L.; /Bergen U.; Brown, D.N.; Kerth, L.T.; Kolomensky, Yu.G.; Lynch, G.; /UC, Berkeley; Koch, H.; Schroeder, T.; /Ruhr U., Bochum; Asgeirsson, D.J.; Hearty, C.; Mattison, T.S.; /British Columbia U. /Brunel U. /Novosibirsk, IYF /UC, Irvine /UC, Riverside /UC, Santa Barbara /UC, Santa Cruz /Caltech /Cincinnati U. /Colorado U. /Colorado State U. /Dortmund U. /Dresden, Tech. U. /Ecole Polytechnique /Edinburgh U. /INFN, Ferrara /INFN, Ferrara /Ferrara U. /INFN, Ferrara /Frascati /INFN, Genoa /Genoa U. /INFN, Genoa /INFN, Genoa /Genoa U. /INFN, Genoa /Indian Inst. Tech., Guwahati /Harvard U. /Harvey Mudd Coll. /Heidelberg U. /Humboldt U., Berlin /Imperial Coll., London /Iowa State U. /Iowa State U. /Johns Hopkins U. /Paris U., VI-VII /LLNL, Livermore /Liverpool U. /Queen Mary, U. of London /Royal Holloway, U. of London /Royal Holloway, U. of London /Louisville U. /Mainz U., Inst. Kernphys. /Manchester U. /Maryland U. /Massachusetts U., Amherst /MIT /McGill U. /INFN, Milan /Milan U. /INFN, Milan /INFN, Milan /Milan U. /Mississippi U. /Montreal U. /INFN, Naples /Naples U. /NIKHEF, Amsterdam /NIKHEF, Amsterdam /Notre Dame U. /Ohio State U. /Oregon U. /INFN, Padua /Padua U. /INFN, Padua /INFN, Padua /Padua U. /Paris U., VI-VII /INFN, Perugia /Perugia U. /INFN, Pisa /Pisa U. /INFN, Pisa /Pisa, Scuola Normale Superiore /INFN, Pisa /Pisa U. /INFN, Pisa /INFN, Pisa /Pisa U. /INFN, Pisa /Princeton U. /INFN, Rome /INFN, Rome /Rome U. /INFN, Rome /INFN, Rome /Rome U. /INFN, Rome /Rostock U. /Rutherford /DAPNIA, Saclay /SLAC /South Carolina U. /Southern Methodist U. /Stanford U., Phys. Dept. /SUNY, Albany /Tel Aviv U. /Tennessee U. /Texas Nuclear Corp., Austin /Texas U. /INFN, Turin /Turin U. /INFN, Trieste /Trieste U. /Valencia U. /Victoria U. /Warwick U. /Wisconsin U., Madison

2011-08-22T23:59:59.000Z

349

Large-Scale Calculations of the Double-Beta Decay of 76Ge, 130Te, 136Xe, and 150Nd in the Deformed Self-Consistent Skyrme Quasiparticle Random-Phase Approximation  

E-Print Network (OSTI)

We use the axially-deformed Skyrme Quasiparticle Random-Phase Approximation (QRPA) together with the SkM* energy-density functional, both as originally presented and with the time-odd part adjusted to reproduce the Gamow-Teller resonance energy in 208Pb, to calculate the matrix elements governing the neutrinoless double-beta decay of 76Ge, 130Te, 136Xe, and 150Nd. Our matrix elements in 130Te and 136Xe are significantly smaller than those of previous QRPA calculations, primarily because of the difference in pairing or deformation between the initial and final nuclei. In 76Ge and 150Nd our results are similar to those of less computationally intensive QRPA calculations. We suspect the 76Ge result, however, because we are forced to use a spherical ground-state, even though the HFB indicates a deformed minimum.

M. T. Mustonen; J. Engel

2013-01-29T23:59:59.000Z

350

Methods of Using Alpha Channeling Together with Transformer Recharging |  

NLE Websites -- All DOE Office Websites (Extended Search)

Methods of Using Alpha Channeling Together with Transformer Recharging Methods of Using Alpha Channeling Together with Transformer Recharging A tokamak current can be sustained using rf waves for transformer recharging at low density and high-Z with high efficiency if the resistivity is kept high enough during the radio frequency recharging stage. At the same time, operation in the hot ion mode via alpha channeling increases the effective fusion reactivity. The two separate inventions can be made to work synergistically. Specifically, by operating the tokamak in a low-density recharge phase, the lower hybrid wave penetrates the plasma more effectively. High reactivity is obtained by operation in the hot ion mode through the alpha channeling technique. Then, by using a high temperature relaxation stage, not only is the plasma current sustained

351

City of Alpha, Minnesota (Utility Company) | Open Energy Information  

Open Energy Info (EERE)

Alpha, Minnesota (Utility Company) Alpha, Minnesota (Utility Company) Jump to: navigation, search Name City of Alpha Place Minnesota Utility Id 266 Utility Location Yes Ownership M NERC Location MRO Activity Bundled Services Yes References EIA Form EIA-861 Final Data File for 2010 - File1_a[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Utility Rate Schedules Grid-background.png Commercial Commercial Residential Residential Average Rates Residential: $0.0758/kWh Commercial: $0.0957/kWh References ↑ "EIA Form EIA-861 Final Data File for 2010 - File1_a" Retrieved from "http://en.openei.org/w/index.php?title=City_of_Alpha,_Minnesota_(Utility_Company)&oldid=409261" Categories:

352

Alpha-beta coordination method for collective search - Energy ...  

An agent in the alpha role is motivated to improve its status by exploring new regions of the search space. ... Solar Photovoltaic; Solar ... by the U.S. Department ...

353

The alpha-particle induced bystander effect for sister chromatid...  

NLE Websites -- All DOE Office Websites (Extended Search)

agents than typical FA cells. We studied the effects of low-dose alpha-particle irradiation-induced bystander effects in KO40 and control CHO cell lines. Cultures of G0...

354

Energetics of [alpha]-helix formation in peptides and proteins  

E-Print Network (OSTI)

This thesis focuses on the energetics of !-helix formation in peptides and proteins. The [alpha]-helix is the most prevalent type of secondary structure found in proteins, and has arguably dominated our thinking about ...

Schubert, Christian Reinhold

2009-01-01T23:59:59.000Z

355

Baroclinic Instabilities of the Two-Layer Quasigeostrophic Alpha Model  

Science Conference Proceedings (OSTI)

The class of alpha models for turbulence may be derived by applying Lagrangian averaging to the exact fluid equations and then making a closure approximation based on Taylors hypothesis of frozen-in fluctuations. This derivation provides a ...

Darryl D. Holm; Beth A. Wingate

2005-07-01T23:59:59.000Z

356

New Constraints on the 18F(p,alpha) 15O Rate in Novae from the (d,p) Reaction  

E-Print Network (OSTI)

The degree to which the (p,gamma) and (p,alpha) reactions destroy 18F at temperatures 1-4x10^8 K is important for understanding the synthesis of nuclei in nova explosions and for using the long-lived radionuclide 18F, a target of gamma-ray astronomy, as a diagnostic of nova mechanisms. The reactions are dominated by low-lying proton resonances near the 18F+p threshold (E_x=6.411 MeV in 19Ne). To gain further information about these resonances, we have used a radioactive 18F beam from the Holifield Radioactive Ion Beam Facility to selectively populate corresponding mirror states in 19F via the inverse d(18F,p)19F neutron transfer reaction. Neutron spectroscopic factors were measured for states in 19F in the excitation energy range 0-9 MeV. Widths for corresponding proton resonances in 19Ne were calculated using a Woods-Saxon potential. The results imply significantly lower 18F(p,gamma)19Ne and 18F(p,alpha)15O reaction rates than reported previously, thereby increasing the prospect of observing the 511-keV annihilation radiation associated with the decay of 18F in the ashes ejected from novae.

R. L. Kozub; D. W. Bardayan; J. C. Batchelder; J. C. Blackmon; C. R. Brune; A. E. Champagne; J. A. Cizewski; T. Davinson; U. Greife; C. J. Gross; C. C. Jewett; R. J. Livesay; Z. Ma; B. H. Moazen; C. D. Nesaraja; L. Sahin; J. P. Scott; D. Shapira; M. S. Smith; J. S. Thomas; P. J. Woods

2004-05-27T23:59:59.000Z

357

Labeled ALPHA4BETA2 ligands and methods therefor  

DOE Patents (OSTI)

Contemplated compositions and methods are employed to bind in vitro and in vivo to an .alpha.4.beta.2 nicotinic acetylcholine receptor in a highly selective manner. Where such compounds are labeled, compositions and methods employing such compounds can be used for PET and SPECT analysis. Alternatively, and/or additionally contemplated compounds can be used as antagonists, partial agonists or agonists in the treatment of diseases or conditions associated with .alpha.4.beta..beta.2 dysfunction.

Mukherjee, Jogeshwar; Pichika, Ramaiah; Potkin, Steven; Leslie, Frances; Chattopadhyay, Sankha

2013-02-19T23:59:59.000Z

358

Decay to bound states of a soliton in a well  

E-Print Network (OSTI)

The decay of a soliton in a trapped state inside a well is shown numerically. Bound states of a kink in an attractive well, both centered and off center are found. Their stability is studied. Unstable soliton solutions inside a repulsive barrier are also found.

G. Klbermann

2008-01-01T23:59:59.000Z

359

Nuclear Structure and Decay Data: Current Status and Future Perspectives  

Science Conference Proceedings (OSTI)

The nuclear structure databases provide physicists around the world with a useful collection of reliable and well documented datasets. The Evaluated Nuclear Structure Data File (ENSDF) database produced by the International Nuclear Structure and Decay Data Network (NSDD) under the auspices of the International Atomic Energy Agency (IAEA)

Filip G. Kondev; Jagdish K. Tuli; International Nuclear Structure and Decay Data Network

2006-01-01T23:59:59.000Z

360

Effects of light scalar mesons in $?\\to 3?$ decay  

E-Print Network (OSTI)

We study the role of a possible nonet of light scalar mesons in the still interesting $\\eta \\to 3\\pi$ decay process, with the primary motivation of learning more about the scalars themselves. The framework is a conventional non-linear chiral Lagrangian of pseudoscalars and vectors, extended to include the scalars. The parameters involving the scalars were previously obtained to fit the s-wave $\\pi\\pi$ and $\\pi$K scatterings in the region up to about 1 GeV as well as the strong decay $\\eta' \\to \\eta \\pi\\pi$. At first, one might expect a large enhancement from diagrams including a light $\\sigma(560)$. However there is an amusing cancellation mechanism which prevents this from occurring. In the simplest model there is an enhancement of about 13 per cent in the \\e3p decay rate due to the scalars. In a more complicated model which includes derivative type symmetry breakers, the cancellation is modified and the scalars contribute about 30 percent of the total decay rate (although the total is not significantly changed). The vectors do not contribute much. Our model produces a reasonable estimate for the related $a_0(980)-f_0(980)$ mixing strength, which has been a topic of current debate. Promising directions for future work along the present line are suggested.

Abdou M. Abdel-Rehim; Deirdre Black; Amir H. Fariborz; Joseph Schechter

2002-10-30T23:59:59.000Z

Note: This page contains sample records for the topic "alpha decay suspected" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

Higgs decay into diphoton in Composite Higgs Model  

E-Print Network (OSTI)

We explore the Higgs couplings to gauge bosons in the minimal $SO(5)/SO(4)$ 4D composite Higgs model. The pions scatterings put unitary constraints on the couplings therefore determine the branch ratios of various Higgs decays. Through fine tuning the parameters, enhancement of Higgs to diphoton rate is possible to be achieved with the existence of vector meson fields.

Cai, Haiying

2013-01-01T23:59:59.000Z

362

Exclusive hadronic B decays to charm and charmonium final states  

E-Print Network (OSTI)

We have fully reconstructed decays of both B0 and B- Mesons into final states containing either D, D*, D**, Psi, Psi', or Chi_{c1} mesons. This allows us to obtain new results on many physics topics including branching ratios, tests of the factorization hypothesis, color suppression, resonant substructure, and the B- - B0 mass difference.

Alam, M S; Nemati, B; O'Neill, J J; Severini, H; Sun, C R; Zoeller, M M; Crawford, G; Daubenmier, C M; Fulton, R; Fujino, D; Gan, K K; Honscheid, K; Kagan, H; Kass, R; Lee, J; Malchow, R L; Morrow, F H; Skovpen, Y; Sung, M; White, C; Butler, F; Fu, X; Kalbfleisch, G R; Ross, W R; Skubic, P L; Snow, J; Wang, P L; Wood, M; Brown, D N; Fast, J; McIlwain, R L; Miao, T; Miller, D H; Modesitt, M; Payne, D; Shibata, E I; Shipsey, I P J; Wang Pei Ning; Battle, M; Ernst, J; Kwon, Y; Roberts, S; Thorndike, E H; Wang, C H; Dominick, J; Lambrecht, M; Sanghera, S; Shelkov, V; Skwarnicki, T; Stroynowski, R; Volobuev, I P; Wei, G; Zadorozhny, P; Artuso, M; Goldberg, M; He, D; Horwitz, N; Kennett, R; Mountain, R; Moneti, G C; Muheim, F; Mukhin, Y; Playfer, S; Rozen, Y; Stone, S; Thulasidas, M; Vasseur, G; Zhu, G; Bartelt, J; Csorna, S E; Egyed, Z; Jain, V; Kinoshita, K; Edwards, K W; Ogg, M; Britton, D I; Hyatt, E R F; MacFarlane, D B; Patel, P M; Akerib, D S; Barish, B C; Chadha, M; Chan, S; Cowen, D F; Eigen, G; Miller, J S; O'Grady, C; Urheim, J; Weinstein, A J; Acosta, D; Athanas, M; Masek, G E; Paar, H P; Gronberg, J B; Kutschke, R; Menary, S R; Morrison, R J; Nakanishi, S; Nelson, H N; Nelson, T K; Qiao, C; Richman, J D; Ryd, A; Tajima, H; Schmidt, D; Sperka, D; Witherell, M S; Procario, M; Balest, R; Cho, K; Daoudi, M; Ford, W T; Johnson, D R; Lingel, K; Lohner, M; Rankin, P; Smith, J G; Alexander, J P; Bebek, C; Berkelman, K; Bloom, K; Browder, T E; Cassel, David G; Cho, H A; Coffman, D M; Drell, P S; Ehrlich, R; Garca-Sciveres, M; Geiser, B; Gittelman, B; Gray, S W; Hartill, D L; Heltsley, B K; Jones, C D; Jones, S L; Kandaswamy, J; Katayama, N; Kim, P C; Kreinick, D L; Ludwig, G S; Masui, J; Mevissen, J; Mistry, N B; Ng, C R; Nordberg, E; Patterson, J R; Peterson, D; Riley, D; Salman, S; Sapper, M; Wrthwein, F; Avery, P; Freyberger, A P; Rodrguez, J; Stephens, R; Yang, S; Yelton, J; Cinabro, D; Henderson, S; Liu, T; Saulnier, M; Wilson, R; Yamamoto, H; Bergfeld, T; Eisenstein, B I; Gollin, G; Ong, B; Palmer, M; Selen, M; Thaler, J J; Sadoff, A J; Ammar, R; Ball, S; Baringer, P; Bean, A; Besson, D; Coppage, D; Copty, N K; Davis, R; Hancock, N; Kelly, M; Kwak, N; Lam, H; Kubota, Y; Lattery, M; Nelson, J K; Patton, S; Perticone, D; Poling, R A; Savinov, V; Schrenk, S; Wang, R; CLEO collaboration

1994-01-01T23:59:59.000Z

363

Prompt Neutron Decay Constant from Feynman Variance Fitting  

SciTech Connect

The use of fast-response liquid scintillators for passive measurements with highly enriched uranium (HEU) castings provides information on the timescale of the fission chain multiplication process for HEU. Thus, these detectors produce time responses characteristic of the HEU and not the moderator around 3He counters. Up to five HEU castings were assembled and the passive time coincidence measurements performed. The prompt neutron decay constants inferred from the Feynman variance data with the arrays of large liquid scintillators are compared with decay constants obtained from previously presented Feynman variance data collected in active interrogation measurements with these same HEU castings. The active measurements used plastic scintillation detectors adjacent to the castings to eliminate time-of-flight effects and showed that the prompt neutron decay constant is clearly not exponential. However, time-of-flight effects in the passive measurements result in exponential behavior and allow the Feynman variance data to be fit with the well-known point kinetics analytical formula. The characterization of the prompt neutron decay constant is investigated by comparing the results of the passive and active measurement data.

McConchie, Seth M [ORNL; Hausladen, Paul [ORNL; Mihalczo, John T [ORNL

2009-01-01T23:59:59.000Z

364

Search for higgs boson diphoton decay with CMS at LHC  

Science Conference Proceedings (OSTI)

We have carried out a detailed study of the inclusive search for the Higgs boson in diphoton decay channel with CMS detector at LHC. The analysis is based on full Monte Carlo simulation. Though for the moment we have only simulated data to work with, ...

Harvey Newman

2006-11-01T23:59:59.000Z

365

Nuclear Chemistry Beta decay of 71,73  

E-Print Network (OSTI)

34 Nuclear Chemistry Beta decay of 71,73 Co: probing single-parti- cle states approaching doubly of primary interest are the nuclear magnetic dipole moment and nuclear electric quadrupole moment. The dipole/or neutrons in the nucleus. The dipole moment provides information on the nuclear quantum structure

Mantica, Paul F.

366

One-nucleon-induced nonmesonic hypernuclear decay in laboratory coordinates  

SciTech Connect

We present a formalism for the computation of one-nucleon-induced nonmesonic weak hypernuclear decay rates in laboratory coordinates, within an independent-particle shell model framework, with a view to its generalization to the case of two-nucleon-induced transitions.

Galeao, A. P. [Instituto de Fisica Teorica, UNESP, 01140-070 Sao Paulo, SP (Brazil); Barbero, C. [Facultad de Ciencias Exactas, UNLP, 1900 La Plata (Argentina) and Instituto de Fisica La Plata, CONICET, 1900 La Plata (Argentina); De Conti, C. [Campus Experimental de Itapeva, UNESP, 18409-010 Itapeva, SP (Brazil); Krmpotic, F. [Facultad de Ciencias Astronomicas y Geofisicas, UNLP, 1900 La Plata (Argentina) and Instituto de Fisica La Plata, CONICET, 1900 La Plata (Argentina)

2013-05-06T23:59:59.000Z

367

Hadronic decays of the tau lepton: Theoretical outlook  

E-Print Network (OSTI)

The structure of the form factors stemmed from the hadronization of QCD currents in the energy region of the resonances can be explored through the analyses of exclusive hadronic decays of the tau lepton. I give a short review on the later theoretical progress achieved in the description of experimental data.

J. Portoles

2007-02-13T23:59:59.000Z

368

Decay Rates for Spherical Scalar Waves in the Schwarzschild Geometry  

E-Print Network (OSTI)

The Cauchy problem is considered for the scalar wave equation in the Schwarzschild geometry. Using an integral spectral representation we derive the exact decay rate for solutions of the Cauchy problem with spherical symmetric initial data, which is smooth and compactly supported outside the event horizon.

Johann Kronthaler

2007-09-24T23:59:59.000Z

369

First Results from the Large Area Lyman Alpha Survey  

E-Print Network (OSTI)

We report on a new survey for z=4.5 Lyman alpha sources, the Large Area Lyman Alpha (LALA) survey. Our survey achieves an unprecedented combination of volume and sensitivity by using narrow-band filters on the new 8192x8192 pixel CCD Mosaic Camera at the 4 meter Mayall telescope of Kitt Peak National Observatory. Well-detected sources with flux and equivalent width matching known high redshift Lyman alpha galaxies (i.e., observed equivalent width above 80 Angstroms and line+continuum flux between 2.6e-17 and 5.2e-17 erg/cm^2/sec in an 80 Angstrom filter) have an observed surface density corresponding to 11000 +- 700 per square degree per unit redshift at z=4.5. Spatial variation in this surface density is apparent on comparison between counts in 6561 and 6730 Angstrom filters. Early spectroscopic followup results from the Keck telescope included three sources meeting our criteria for good Lyman alpha candidates. Of these, one is confirmed as a z=4.52 source, while another remains consistent with either z=4.55 or z=0.81. We infer that 30 to 50% of our good candidates are bona fide Lyman alpha emitters, implying a net density of about 4000 Lyman alpha galaxies per square degree per unit redshift.

James E. Rhoads; Sangeeta Malhotra; Arjun Dey; Daniel Stern; Hyron Spinrad; Buell Jannuzi

2000-03-31T23:59:59.000Z

370

H/sub. cap alpha. / studies on TFTR  

DOE Green Energy (OSTI)

H/sub ..cap alpha../ emission is a useful indicator of hydrogen ionization since the energy required to excite hydrogen to the n = 3 level is approximately the same as to ionize the hydrogen atom. Other aspects of recycling, such as plasma scrape-off parameters, wall particle fluxes, and wall retention rates can be inferred from spatial distributions of H/sub ..cap alpha../ emission. There are two H/sub ..cap alpha../ diagnostics on TFTF observing the inner limiter: a relatively calibrated wide-angle TV camera, and the absolutely calibrated HAIFA diagnostic, both viewing the inner limiter. H/sub ..cap alpha../ observations by these instruments have been analyzed using the DEGAS neutral transport code. The core recycling rate, and ion and neutral particle limiter fluxes, have been deduced from the calculations. The results are very sensitive to the ion flux distribution, and therefore also provide information on the plasma scrape-off conditions. A survey was made of over 500 TFTR discharges. H/sub ..cap alpha../ emission appears to increase in proportion to /bar n//sub e//sup 2/. The ratio of core ionization to average H/sub ..cap alpha../ emission was calculated to be roughly constant over a large range of discharges. 9 refs., 4 figs., 1 tab.

Heifetz, D.B.; Ehrhardt, A.B.; Ramsey, A.T.; Dylla, H.F.; Budny, R.; McNeill, D.; Medley, S.; Ulrickson, M.

1988-08-01T23:59:59.000Z

371

RAYLEIGH-TAYLOR STRENGTH EXPERIMENTS OF THE PRESSURE-INDUCED alpha->epsilon->alpha' PHASE TRANSITION IN IRON  

SciTech Connect

We present here the first dynamic Rayleigh-Taylor (RT) strength measurement of a material undergoing solid-solid phase transition. Iron is quasi-isentropically driven across the pressure-induced bcc ({alpha}-Fe) {yields} hcp ({var_epsilon}-Fe) phase transition and the dynamic strength of the {alpha}, {var_epsilon} and reverted {alpha}{prime} phases have been determined via proton radiography of the resulting Rayleigh-Taylor unstable interface between the iron target and high-explosive products. Simultaneous velocimetry measurements of the iron free surface yield the phase transition dynamics and, in conjunction with detailed hydrodynamic simulations, allow for determination of the strength of the distinct phases of iron. Forward analysis of the experiment via hydrodynamic simulations reveals significant strength enhancement of the dynamically-generated {var_epsilon}-Fe and reverted {alpha}{prime}-Fe, comparable in magnitude to the strength of austenitic stainless steels.

Belof, J L; Cavallo, R M; Olson, R T; King, R S; Gray, G T; Holtkamp, D B; Chen, S R; Rudd, R E; Barton, N R; Arsenlis, A; Remington, B A; Park, H; Prisbrey, S T; Vitello, P A; Bazan, G; Mikaelian, K O; Comley, A J; Maddox, B R; May, M J

2011-08-10T23:59:59.000Z

372

Production of the Alpha-Particle Emitting Radionuclide Astatine-211 at the Texas A&M Cyclotron Institute  

E-Print Network (OSTI)

The need of a stable production of At-211 is necessary to continue research in alpha-particle targeted radionuclide therapy. Our objectives were to establish the production of Astatine-211 at Texas A&M Cyclotron Institute, optimize the production methods to reduce the generation of contaminants and maximize At-211 production, and assess the radiological safety aspects of At-211 production. The production of the alpha-particle emitting radionuclide At-211 was performed at the Texas A&M Cyclotron Institute using the K500 superconducting cyclotron following the production reaction Bi-209(?, 2n)At-211 using a thick bismuth target of 500 ?m. We carried out two irradiation experiments where the initial energy of the alpha-particle beam, 80 MeV, was degraded using multiple copper and aluminum foils to 27.8 and 25.3 MeV, respectively. The end of beam time was 4 hours for both experiments. The resulting At-211 yields were 36.0 and 12.4 MBq/?A-h, respectively. Several impurities were produced using the 27.8 MeV, which included At-210 and Po-210. However, when the 25.3 MeV beam was used, the impurities At-210 and Po-210 were resolved and other contaminants were minimized to less than 0.8% of At-211 yield. The production yields were in accordance to previous published results. From the success of these initial experiments, additional steps were taken to produce At-211 in excess quantities for distillation purposes. In order to obtain viable quantities of At-211, the gross yield needed to be increased due to losses that are incurred during distillation and radioactive decay. The ability to produce high yields of this isotope required a redesign of the target and use of the K150 cyclotron using a higher beam intensity.

Bhakta, Viharkumar Satish

2011-08-01T23:59:59.000Z

373

Search for a light Higgs boson decaying to two gluons or ss? in the radiative decays of ?(1S)  

E-Print Network (OSTI)

We search for the decay ?(1S)??A[superscript 0], A[superscript 0]?gg or ss? , where A[superscript 0] is the pseudoscalar light Higgs boson predicted by the next-to-minimal supersymmetric Standard Model. We use a sample of ...

Cowan, Ray Franklin

374

Predictability of Precipitation from Continental Radar Images. Part V: Growth and Decay  

Science Conference Proceedings (OSTI)

In a Lagrangian frame of reference, the accuracy of rainfall systems predicted by nowcasting algorithms can be improved by incorporating the growth and decay of the rainfall. The scale dependence of predictability of growth and decay of ...

Basivi Radhakrishna; Isztar Zawadzki; Frdric Fabry

2012-11-01T23:59:59.000Z

375

Searches for Exotic Decays of the Upsilon(3S) at BaBar  

SciTech Connect

In this paper we present two searches for new physics in {Upsilon}(3S) decays collected by the BABAR detector. We search for charged lepton-flavour violating decays of the {Upsilon}(3S), which are unobservable in the Standard Model but are predicted to occur in several beyond-the-Standard Model scenarios. We also search for production of a light Higgs or Higgs-like state produced in radiative decays of the {Upsilon}(3S) and decaying to muon pairs.

Hooberman, Benjamin; /LBL, Berkeley /Heidelberg U.

2011-12-01T23:59:59.000Z

376

Search for the Standard Model Higgs boson in the fully leptonic WW decay channel at CMS  

E-Print Network (OSTI)

of the Higgs boson . . . . . . . . . . . . . . . . . . . . .the Higgs boson . . . . . . . . . . . . . . . . . . . . . .5 Search for the Higgs Boson in the WW Decay Channel . . .

LeBourgeois, Matthew; LeBourgeois, Matthew

2012-01-01T23:59:59.000Z

377

Resonance strengths in the 14N(p,gamma)15O and 15N(p,alpha gamma)12C reactions  

E-Print Network (OSTI)

The 14N(p,gamma)15O reaction is the slowest reaction of the carbon-nitrogen-oxygen cycle of hydrogen burning in stars. As a consequence, it determines the rate of the cycle. The 15N(p,alpha gamma)12C reaction is frequently used in inverse kinematics for hydrogen depth profiling in materials. The 14N(p,gamma)15O and 15N(p,alpha gamma)12C reactions have been studied simultaneously, using titanium nitride targets of natural isotopic composition and a proton beam. The strengths of the resonances at Ep = 1058 keV in 14N(p,gamma)15O and at Ep = 897 and 430 keV in 15N(p,alpha gamma)12C have been determined with improved precision, relative to the well-known resonance at Ep = 278 keV in 14N(p,gamma)15O. The new recommended values are \\omega\\gamma = 0.352$\\pm$0.018, 362$\\pm$20, and 22.0$\\pm$0.9\\,eV for their respective strengths. In addition, the branching ratios for the decay of the Ep = 1058 keV resonance in 14N(p,gamma)15O have been redetermined. The data reported here should facilitate future studies of off-resona...

Marta, Michele; Bemmerer, Daniel; Beyer, Roland; Broggini, Carlo; Caciolli, Antonio; Erhard, Martin; Flp, Zsolt; Grosse, Eckart; Gyrky, Gyrgy; Hannaske, Roland; Junghans, Arnd R; Menegazzo, Roberto; Nair, Chithra; Schwengner, Ronald; Szcs, Tams; Vezz, Simone; Wagner, Andreas; Yakorev, Dmitry

2010-01-01T23:59:59.000Z

378

Alpha-beta coordination method for collective search  

DOE Patents (OSTI)

The present invention comprises a decentralized coordination strategy called alpha-beta coordination. The alpha-beta coordination strategy is a family of collective search methods that allow teams of communicating agents to implicitly coordinate their search activities through a division of labor based on self-selected roles and self-determined status. An agent can play one of two complementary roles. An agent in the alpha role is motivated to improve its status by exploring new regions of the search space. An agent in the beta role is also motivated to improve its status, but is conservative and tends to remain aggregated with other agents until alpha agents have clearly identified and communicated better regions of the search space. An agent can select its role dynamically based on its current status value relative to the status values of neighboring team members. Status can be determined by a function of the agent's sensor readings, and can generally be a measurement of source intensity at the agent's current location. An agent's decision cycle can comprise three sequential decision rules: (1) selection of a current role based on the evaluation of the current status data, (2) selection of a specific subset of the current data, and (3) determination of the next heading using the selected data. Variations of the decision rules produce different versions of alpha and beta behaviors that lead to different collective behavior properties.

Goldsmith, Steven Y. (Albuquerque, NM)

2002-01-01T23:59:59.000Z

379

Transcriptional regulation of human retinoic acid receptor-alpha (RAR-{alpha}) by Wilms` tumour gene product  

SciTech Connect

The Wilms` tumor gene encodes a 47-49 kDa transcription factor expressed in kidney, gonads and mesothelium during embryogenesis. Inherited mutations of WT1 lead to aberrant urogenital development and Wilms` tumor, but the role of WT1 in development is not fully understood. Since the human RAR-{alpha} gene contains a potential WT1 binding site at its 5{prime} end, we studied the effect of WT1 co-transfection on expression of an RAR-{alpha} promoter/CAT reporter construct in COS cells. COS cells were plated at 5X10{sup 5} cells/dish in DMEM with 10% FBS and transfected by the Ca/PO4 method with an expression plasmid containing the full-length WT1 (-/-) cDNA under the control of the CMV promoter, plasmid containing the RAR-{alpha} promoter (-519 to +36)/CAT reporter and TK/growth hormone plasmid to control for efficiency of transfection. CAT/GH activity at 48 hours was inhibited by co-transfection with increasing amounts of WT1 (-/-); maximum inhibition = 5% of control. WT1 co-transfection did not affect expression of TKGH, nor of a CMV-CAT vector. Expression of WT1 protein in tranfected COS cells was demonstrated by Western blotting. Minimal inhibiton of RAR-{alpha}/CAT activity was seen when cells were co-transfected with vectors containing WT1 deletion mutants, alternate WT1 splicing variants, or WT1 (-/-) cDNA bearing a mutation identified in a patient with Drash syndrome. Gel shift assays indicated binding of WT1 to RAR-{alpha} cDNA but not to an RAR-{alpha} deletion mutant lacking the GCGGGGGGCG site. These observations suggest that WT1 may function to regulate RAR-{alpha} expression during normal development.

Goodyer, P.R.; Torban, E.; Dehbi, M. [and others

1994-09-01T23:59:59.000Z

380

Exactly Solvable Model for the Decay of Superdeformed Nuclei  

E-Print Network (OSTI)

The history and importance of superdeformation in nuclei is briefly discussed. A simple two-level model is then employed to obtain an elegant expression for the branching ratio for the decay via the E1 process in the normal-deformed band of superdeformed nuclei. From this expression, the spreading width Gamma^downarrow for superdeformed decay is found to be determined completely by experimentally known quantities. The accuracy of the two-level approximation is verified by considering the effects of other normal-deformed states. Furthermore, by using a statistical model of the energy levels in the normal-deformed well, we can obtain a probabilistic expression for the tunneling matrix element V.

B. R. Barrett; D. M. Cardamone; C. A. Stafford

2005-08-19T23:59:59.000Z

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381

Evidence for the Decay Sigma+ -> p mu+ mu-  

E-Print Network (OSTI)

We report the first evidence for the decay Sigma+ -> p mu+ mu- from data taken by the HyperCP experiment(E871) at Fermilab. Based on three observed events, the branching ratio is B(Sigma+ -> p,mu+,mu-) = [8.6 +6.6,-5.4(stat) +/-5.5(syst)] x 10**-8. The narrow range of dimuon masses may indicate that the decay proceeds via a neutral intermediate state, Sigma+ -> p P0, P0 -> mu+ mu-, with a P0 mass of 214.3 +/- 0.5 MeV/c**2 and branching ratio B(Sigma+ -> p P0; P0 -> mu+ mu-) = [3.1 +2.4,-1.(stat) +/-1.5(syst)] x 10**-8.

H. K. Park; R. A. Burnstein; A. Chakravorty; Y. C. Chen; W. S. Choong; K. Clark; E. C. Dukes; C. Durandet; J. Felix; Y. Fu; G. Gidal; H. R. Gustafson; T. Holmstrom; M. Huang; C. James; C. M. Jenkins; T. Jones; D. M. Kaplan; L. M. Lederman; N. Leros; M. J. Longo; F. Lopez; L. C. Lu; W. Luebke; K. B. Luk; K. S. Nelson; J. -P. Perroud; D. Rajaram; H. A. Rubin; J. Volk; C. G. White; S. L. White; P. Zyla

2005-01-07T23:59:59.000Z

382

Branching Fraction Measurement of B to omega l nu decays  

SciTech Connect

We present a measurement of the B{sup +} {yields} {omega}{ell}{sup +}{nu} branching fraction based on a sample of 467 million B{bar B} pairs recorded by the BABAR detector at the SLAC PEP-II e{sup +}e{sup -} collider. We observe 1041 {+-} 133 signal decays, corresponding to a branching fraction of {Beta}(B{sup +} {yields} {omega}{ell}{sup +}{nu}) = (1.15 {+-} 0.15 {+-} 0.12) x 10{sup -4}, where the first error is statistical and the second is systematic. The dependence of the decay rate on q{sup 2}, the momentum transfer squared to the lepton system, is compared to QCD predictions of the form factors based on a quark model and light-cone sum rules.

Lees, J.P.; Poireau, V.; Tisserand, V.; /Annecy, LAPP; Garra Tico, J.; Grauges, E.; /Barcelona U., ECM; Palano, A.; /Bari U. /INFN, Bari; Eigen, G.; Stugu, B.; /Bergen U.; Brown, D.N.; Kerth, L.T.; Kolomensky, Yu.G.; Lynch, G.; /LBL, Berkeley /UC, Berkeley; Koch, H.; Schroeder, T.; /Ruhr U., Bochum; Asgeirsson, D.J.; Hearty, C.; Mattison, T.S.; McKenna, J.A.; So, R.Y.; /British Columbia U.; Khan, A.; /Brunel U.; Blinov, V.E.; /Novosibirsk, IYF /UC, Irvine /UC, Riverside /UC, Santa Barbara /UC, Santa Cruz /Caltech /Cincinnati U. /Colorado U. /Colorado State U. /Dortmund U. /Dresden, Tech. U. /Ecole Polytechnique /Edinburgh U. /Ferrara U. /INFN, Ferrara /Frascati /Genoa U. /INFN, Genoa /Indian Inst. Tech., Guwahati /Harvard U. /Harvey Mudd Coll. /Heidelberg U. /Humboldt U., Berlin /Imperial Coll., London /Iowa State U. /Iowa State U. /Johns Hopkins U. /Orsay, LAL /LLNL, Livermore /Liverpool U. /Queen Mary, U. of London /Royal Holloway, U. of London /Louisville U. /Mainz U., Inst. Kernphys. /Manchester U., Comp. Sci. Dept. /Maryland U. /Massachusetts U., Amherst /MIT /McGill U. /Milan U. /INFN, Milan /Mississippi U. /Montreal U. /Naples U. /INFN, Naples /NIKHEF, Amsterdam /Notre Dame U. /Ohio State U.; /more authors..

2012-06-13T23:59:59.000Z

383

Phenomenology of a leptonic goldstino and invisible Higgs boson decays  

E-Print Network (OSTI)

Non-linearly realized supersymmetry, combined with the Standard Model field content and SU(3)XSU(2)XU(1) gauge invariance, permits local dimension-six operators involving a goldstino, a lepton doublet and a Higgs doublet. These interactions preserve total lepton number if the left-handed goldstino transforms as an antilepton. We discuss the resulting phenomenology, in the simple limit where the new couplings involve only one lepton family, thus conserving also lepton flavour. Both the Z boson and the Higgs boson can decay into a neutrino and a goldstino: the present limits from the invisible Z width and from other observables leave room for the striking possibility of a Higgs boson decaying dominantly, or at least with a sizable branching ratio, via such an invisible mode. We finally comment on the perspectives at hadron and lepton colliders, and on possible extensions of our analysis.

Ignatios Antoniadis; Marc Tuckmantel; Fabio Zwirner

2004-10-12T23:59:59.000Z

384

Search for Charged Lepton Violation in Narrow Upsilon Decays  

SciTech Connect

Charged lepton flavor violating processes are unobservable in the standard model, but they are predicted to be enhanced in several extensions to the standard model, including supersymmetry and models with leptoquarks or compositeness. We present a search for such processes in a sample of 99 x 10{sup 6} {Upsilon}(2S) decays and 117 x 10{sup 6} {Upsilon}(3S) decays collected with the BABAR detector. We place upper limits on the branching fractions {Beta}({Upsilon}(nS) {yields} e{sup {+-}}{tau}{sup {-+}}) and {Beta}({Upsilon}(nS) {yields} {mu}{sup {+-}}{tau}{sup {-+}}) (n = 2, 3) at the 10{sup -6} level and use these results to place lower limits of order 1 TeV on the mass scale of charged lepton flavor violating effective operators.

Lees, J.P.; Poireau, V.; Prencipe, E.; Tisserand, V.; /Annecy, LAPP; Garra Tico, J.; Grauges, E.; /Barcelona U., ECM; Martinelli, M.; Palano, A.; Pappagallo, M.; /Bari U. /INFN, Bari; Eigen, G.; Stugu, B.; Sun, L.; /Bergen U.; Battaglia, M.; Brown, D.N.; Hooberman, B.; Kerth, L.T.; Kolomensky, Yu.G.; Lynch, G.; Osipenkov, I.L.; Tanabe, T.; /LBL, Berkeley /UC, Berkeley; Hawkes, C.M.; /Birmingham U. /Ruhr U., Bochum /British Columbia U. /Brunel U. /Novosibirsk, IYF /UC, Irvine /UC, Riverside /UC, San Diego /UC, Santa Barbara /UC, Santa Cruz /Caltech /Cincinnati U. /Colorado U. /Colorado State U. /Dortmund U. /Dresden, Tech. U. /Ecole Polytechnique /Edinburgh U. /Ferrara U. /INFN, Ferrara /Frascati /Columbus Supercond., Genova /INFN, Genoa /Indian Inst. Tech., Guwahati /Harvard U. /Heidelberg U. /Humboldt U., Berlin /Imperial Coll., London /Iowa State U. /Iowa State U. /Johns Hopkins U. /Orsay, LAL /LLNL, Livermore /Liverpool U. /Queen Mary, U. of London /Royal Holloway, U. of London /Louisville U. /Mainz U., Inst. Kernphys. /Manchester U. /Maryland U. /Massachusetts U., Amherst /MIT /McGill U. /Consorzio Milano Ricerche /INFN, Milan /Mississippi U. /Montreal U. /Napoli Seconda U. /INFN, Naples /NIKHEF, Amsterdam /Notre Dame U. /Ohio State U. /Oregon U. /Padua U. /INFN, Padua /Paris U., VI-VII /Perugia U. /INFN, Perugia /INFN, Pisa /Princeton U. /Rome U. /INFN, Rome /Rostock U. /Rutherford /DAPNIA, Saclay /SLAC /South Carolina U. /Stanford U., Phys. Dept. /SUNY, Albany /Tel Aviv U. /Tennessee U. /Texas U. /Texas U., Dallas /Turin U. /INFN, Turin /Trieste U. /INFN, Trieste /Valencia U., IFIC /Victoria U. /Warwick U. /Wisconsin U., Madison

2011-08-19T23:59:59.000Z

385

Analysis of B ? ?l? Decays With BaBar  

SciTech Connect

As part of the BaBar project at SLAC to study the properties of B mesons, we have carried out a study of the exclusive charmless semileptonic decay mode B ? ?l?, which can be used to determine the magnitude of the Cabbibo- Kobayashi-Maskawa matrix element Vub. Using simulated event samples, this study focuses on determining criteria on variables for selection of B ? ?l? signal and suppression of background from other types of BB events and continuum processes. In addition, we determine optimal cuts on variables to ensure a good neutrino reconstruction. With these selection cuts, we were able to achieve a signal-to-background ratio of 0.68 and a signal efficiency of the order of 1%. Applying these cuts to a sample of 83 million BB events recorded by BaBar in e+e collisions at the (4S) resonance, we obtain a yield of 115 19 B ? ?l? decays.

Chu, Y.; Littlejohn, B.; Binfelder, J.

2006-01-01T23:59:59.000Z

386

LSP sneutrino decays into heavy standard model pairs  

E-Print Network (OSTI)

In bilinear R-parity violation (BRpV), in which the superpotential includes a bilinear term between the lepton doublet and the up-type Higgs superfields, a sneutrino LSP can decay into pairs of heavy standard model states: W's, Z's, tops or Higgs bosons. These finals states can dominate over the traditionally considered bottom pair final state. This would lead to unique and novel supersymmetric signals with each supersymmetric event possibly producing two pairs of these heavy standard model fields. We investigate this possibility and find that the branching ratio into heavier states dominates when the bilinear term is much smaller than the sneutrino vacuum expectation value for a given sneutrino flavor. When BRpV is the only source of neutrino masses these decays can only dominate for one of the sneutrino generations. Relaxing this constraint opens these channels for all three generations.

D. Aristizabal Sierra; D. Restrepo; S. Spinner

2012-12-13T23:59:59.000Z

387

Reduced Beta Decay Rates of Iron Isotopes for Supernova Physics  

SciTech Connect

During the late phases of stellar evolution beta decay on iron isotopes, in the core of massive stars, plays a crucial role in the dynamics of core-collapse. The beta decay contributes in maintaining a 'respectable' lepton-to-baryon ratio (PSI{sub e}) of the core prior to collapse which results in a larger shock energy to power the explosion. It is indeed a fine tuning of the parameter PSI{sub e} at various stages of supernova physics which can lead to a successful transformation of the collapse into an explosion. The calculations presented here might help in fine-tuning of PSI{sub e} for the collapse simulators of massive stars.

Nabi, Jameel-Un [Faculty of Engineering Sciences, GIK Institute of Engineering Sciences and Technology, Topi 23460, N.W.F.P. (Pakistan)

2009-07-07T23:59:59.000Z

388

Microscopic description of complex nuclear decay: multimodal fission  

E-Print Network (OSTI)

Our understanding of nuclear fission, a fundamental nuclear decay, is still incomplete due to the complexity of the process. In this paper, we describe a study of spontaneous fission using the symmetry-unrestricted nuclear density functional theory. Our results show that the observed bimodal fission can be explained in terms of pathways in multidimensional collective space corresponding to different geometries of fission products. We also predict a new phenomenon of trimodal spontaneous fission for some rutherfordium, seaborgium, and hassium isotopes.

A. Staszczak; A. Baran; J. Dobaczewski; W. Nazarewicz

2009-06-23T23:59:59.000Z

389

Observation of New Charmless Decays of Bottom Hadrons  

SciTech Connect

The authors search for new charmless decays of neutral b-hadrons to pairs of charged hadrons with the upgraded Collider Detector at the Fermilab Tevatron. Using a data sample corresponding to 1 fb{sup -1} of integrated luminosity, they report the first observation of the B{sub s}{sup 0} {yields} K{sup +}{pi}{sup +} decay, with a significance of 8.2{sigma}, and measure {Beta}(B{sub s}{sup 0} {yields} K{sup -}{pi}{sup +}) = (5.0 {+-} 0.7 (stat.) {+-} 0.8 (syst.)) x 10{sup -6}. They also report the first observation of charmless b-baryon decays in the channels {Lambda}{sub b}{sup 0} {yields} p{pi}{sup -} and {Lambda}{sub b}{sup 0} {yields} pK{sup -} with significances of 6.0{sigma} and 11.5{sigma} respectively, and they measure {Beta}({Lambda}{sub b}{sup 0} {yields} p{pi}{sup -}) = (3.5 {+-} 0.6 (stat.) {+-} 0.9 (syst.)) x 10{sup -6} and {Beta}({Lambda}{sub b}{sup 0} {yields} pK{sup -}) = (5.6 {+-} 0.8 (stat.) {+-} 1.5 (syst.)) x 10{sup -6}. No evidence is found for the decays B{sup 0} {yields} K{sup +}K{sup -} and B{sub s}{sup 0} {yields} {pi}{sup +}{pi}{sup -}, and they set an improved upper limit {Beta}(B{sub s}{sup 0} {yields} {pi}{sup +}{pi}{sup -}) < 1.2 x 10{sup -6} at the 90% confidence level. All quoted branching fractions are measured using {Beta}(B{sup 0} {yields} K{sup +}{pi}{sup -}) as a reference.

Morello, Michael J.; /Fermilab

2010-02-01T23:59:59.000Z

390

Search for the rare decays Bs -->mumu and Bd -->mumu  

E-Print Network (OSTI)

A search for the decays Bs-->mumu and Bd-->mumu is performed with about 37 pb^{-1} of pp collisions at sqrt{s} = 7 TeV collected by the LHCb experiment at the Large Hadron Collider at CERN. The observed numbers of events are consistent with the background expectations. The resulting upper limits on the branching ratios are BR(Bs-->mumu) mumu) <1.5 x 10^{-8} at 95% confidence level.

LHCb Collaboration; R. Aaij; B. Adeva; M. Adinolfi; C. Adrover; A. Affolder; Z. Ajaltouni; J. Albrecht; F. Alessio; M. Alexander; P. Alvarez Cartelle; A. A. Alves Jr; S. Amato; Y. Amhis; J. Amoraal; J. Anderson; R. B. Appleby; O. Aquines Gutierrez; L. Arrabito; M. Artuso; E. Aslanides; G. Auriemma; S. Bachmann; D. S. Bailey; V. Balagura; W. Baldini; R. J. Barlow; C. Barschel; S. Barsuk; A. Bates; C. Bauer; Th. Bauer; A. Bay; I. Bediaga; K. Belous; I. Belyaev; E. Ben-Haim; M. Benayoun; G. Bencivenni; R. Bernet; M. -O. Bettler; M. van Beuzekom; A. Bien; S. Bifani; A. Bizzeti; P. M. Bjrnstad; T. Blake; F. Blanc; C. Blanks; J. Blouw; S. Blusk; A. Bobrov; V. Bocci; A. Bondar; N. Bondar; W. Bonivento; S. Borghi; A. Borgia; E. Bos; T. J. V. Bowcock; C. Bozzi; T. Brambach; J. van den Brand; J. Bressieux; S. Brisbane; M. Britsch; T. Britton; N. H. Brook; H. Brown; A. Bchler-Germann; A. Bursche; J. Buytaert; S. Cadeddu; J. M. Caicedo Carvajal; O. Callot; M. Calvi; M. Calvo Gomez; A. Camboni; P. Campana; A. Carbone; G. Carboni; R. Cardinale; A. Cardini; L. Carson; K. Carvalho Akiba; G. Casse; M. Cattaneo; M. Charles; Ph. Charpentier; N. Chiapolini; X. Cid Vidal; P. J. Clark; P. E. L. Clarke; M. Clemencic; H. V. Cliff; J. Closier; C. Coca; V. Coco; J. Cogan; P. Collins; F. Constantin; G. Conti; A. Contu; M. Coombes; G. Corti; G. A. Cowan; R. Currie; B. D'Almagne; C. D'Ambrosio; W. Da Silva; P. David; I. De Bonis; S. De Capua; M. De Cian; F. De Lorenzi; J. M. De Miranda; L. De Paula; P. De Simone; D. Decamp; H. Degaudenzi; M. Deissenroth; L. Del Buono; C. Deplano; O. Deschamps; F. Dettori; J. Dickens; H. Dijkstra; M. Dima; P. Diniz Batista; S. Donleavy; D. Dossett; A. Dovbnya; F. Dupertuis; R. Dzhelyadin; C. Eames; S. Easo; U. Egede; V. Egorychev; S. Eidelman; D. van Eijk; F. Eisele; S. Eisenhardt; L. Eklund; Ch. Elsasser; D. G. d'Enterria; D. Esperante Pereira; L. Estve; A. Falabella; E. Fanchini; C. Frber; G. Fardell; C. Farinelli; S. Farry; V. Fave; V. Fernandez Albor; M. Ferro-Luzzi; S. Filippov; C. Fitzpatrick; F. Fontanelli; R. Forty; M. Frank; C. Frei; M. Frosini; S. Furcas; A. Gallas Torreira; D. Galli; M. Gandelman; P. Gandini; Y. Gao; J-C. Garnier; J. Garofoli; L. Garrido; C. Gaspar; N. Gauvin; M. Gersabeck; T. Gershon; Ph. Ghez; V. Gibson; V. V. Gligorov; C. Gbel; D. Golubkov; A. Golutvin; A. Gomes; H. Gordon; M. Grabalosa Gndara; R. Graciani Diaz; L. A. Granado Cardoso; E. Graugs; G. Graziani; A. Grecu; S. Gregson; B. Gui; E. Gushchin; Yu. Guz; T. Gys; G. Haefeli; S. C. Haines; T. Hampson; S. Hansmann-Menzemer; R. Harji; N. Harnew; P. F. Harrison; J. He; K. Hennessy; P. Henrard; J. A. Hernando Morata; E. van Herwijnen; A. Hicheur; E. Hicks; W. Hofmann; K. Holubyev; P. Hopchev; W. Hulsbergen; P. Hunt; T. Huse; R. S. Huston; D. Hutchcroft; V. Iakovenko; P. Ilten; J. Imong; R. Jacobsson; M. Jahjah Hussein; E. Jans; F. Jansen; P. Jaton; B. Jean-Marie; F. Jing; M. John; D. Johnson; C. R. Jones; B. Jost; F. Kapusta; T. M. Karbach; J. Keaveney; U. Kerzel; T. Ketel; A. Keune; B. Khanji; Y. M. Kim; M. Knecht; S. Koblitz; A. Konoplyannikov; P. Koppenburg; A. Kozlinskiy; L. Kravchuk; G. Krocker; P. Krokovny; F. Kruse; K. Kruzelecki; M. Kucharczyk; S. Kukulak; R. Kumar; T. Kvaratskheliya; V. N. La Thi; D. Lacarrere; G. Lafferty; A. Lai; R. W. Lambert; G. Lanfranchi; C. Langenbruch; T. Latham; R. Le Gac; J. van Leerdam; J. -P. Lees; R. Lefvre; A. Leflat; J. Lefranois; O. Leroy; T. Lesiak; L. Li; Y. Y. Li; L. Li Gioi; M. Lieng; M. Liles; R. Lindner; C. Linn; B. Liu; G. Liu; J. H. Lopes; E. Lopez Asamar; N. Lopez-March; J. Luisier; B. M'charek; F. Machefert; I. V. Machikhiliyan; F. Maciuc; O. Maev; J. Magnin; A. Maier; S. Malde; R. M. D. Mamunur; G. Manca; G. Mancinelli; N. Mangiafave; U. Marconi; R. Mrki; J. Marks; G. Martellotti; A. Martens; L. Martin; A. Martn Snchez; D. Martinez Santos; A. Massafferri; Z. Mathe; C. Matteuzzi; M. Matveev; V. Matveev; E. Maurice; B. Maynard; A. Mazurov; G. McGregor; R. McNulty; C. Mclean; M. Meissner; M. Merk; J. Merkel; M. Merkin; R. Messi; S. Miglioranzi; D. A. Milanes; M. -N. Minard; S. Monteil; D. Moran; P. Morawski; J. V. Morris; R. Mountain; I. Mous; F. Muheim; K. Mller; R. Muresan; F. Murtas; B. Muryn; M. Musy; J. Mylroie-Smith; P. Naik; T. Nakada; R. Nandakumar; J. Nardulli; M. Nedos; M. Needham; N. Neufeld; M. Nicol; S. Nies; V. Niess; N. Nikitin; A. Oblakowska-Mucha; V. Obraztsov; S. Oggero; O. Okhrimenko; R. Oldeman; M. Orlandea; A. Ostankov; B. Pal; J. Palacios; M. Palutan; J. Panman; A. Papanestis; M. Pappagallo; C. Parkes; C. J. Parkinson; G. Passaleva; G. D. Patel; M. Patel; S. K. Paterson; G. N. Patrick; C. Patrignani; C. Pavel -Nicorescu; A. Pazos Alvarez; A. Pellegrino; G. Penso; M. Pepe Altarelli; S. Perazzini; D. L. Perego; E. Perez Trigo; A. Prez-Calero Yzquierdo; P. Perret; A. Petrella

2011-03-12T23:59:59.000Z

391

Numerical simulations of the decay of primordial magnetic turbulence  

SciTech Connect

We perform direct numerical simulations of forced and freely decaying 3D magnetohydrodynamic turbulence in order to model magnetic field evolution during cosmological phase transitions in the early Universe. Our approach assumes the existence of a magnetic field generated either by a process during inflation or shortly thereafter, or by bubble collisions during a phase transition. We show that the final configuration of the magnetic field depends on the initial conditions, while the velocity field is nearly independent of initial conditions.

Kahniashvili, Tina [McWilliams Center for Cosmology and Department of Physics, Carnegie Mellon University, 5000 Forbes Ave, Pittsburgh, Pennsylvania 15213 (United States); Department of Physics, Laurentian University, Ramsey Lake Road, Sudbury, ON P3E 2C (Canada); Abastumani Astrophysical Observatory, Ilia State University, 2A Kazbegi Ave, Tbilisi, GE-0160 (Georgia); Brandenburg, Axel [Nordita, AlbaNova University Center, Roslagstullsbacken 23, 10691 Stockholm (Sweden); Department of Astronomy, Stockholm University, SE 10691 Stockholm (Sweden); Tevzadze, Alexander G. [Abastumani Astrophysical Observatory, Ilia State University, 2A Kazbegi Ave, Tbilisi, GE-0160 (Georgia); Faculty of Exact and Natural Sciences, Tbilisi State University, 1 Chavchavadze Avenue Tbilisi, GE-0128 (Georgia); Ratra, Bharat [Department of Physics, Kansas State University, 116 Cardwell Hall, Manhattan, Kansas 66506 (United States)

2010-06-15T23:59:59.000Z

392

Search for the Lepton-Number-Violating Decay $?^- \\to p ?^- ?^-$  

E-Print Network (OSTI)

A sensitive search for the lepton-number-violating decay $\\Xi^-\\to p \\mu^-\\mu^-$ has been performed using a sample of $\\sim10^9$ $\\Xi^-$ hyperons produced in 800 GeV/$c$ $p$-Cu collisions. We obtain $\\mathcal{B}(\\Xi^-\\to p \\mu^-\\mu^-)< 4.0\\times 10^{-8}$ at 90% confidence, improving on the best previous limit by four orders of magnitude.

HyperCP Collaboration; D. Rajaram; R. A. Burnstein; A. Chakravorty; Y. C. Chen; W. -S. Choong; K. Clark; E. C. Dukes; C. Durandet; J. Felix; Y. Fu; G. Gidal; H. R. Gustafson; T. Holmstrom; M. Huang; C. James; C. M. Jenkins; T. D. Jones; D. M. Kaplan; M. J. Longo; L. C. Lu; W. Luebke; K. -B. Luk; K. S. Nelson; H. K. Park; J. -P. Perroud; H. A. Rubin; J. Volk; C. G. White; S. L. White; P. Zyla

2005-05-12T23:59:59.000Z

393

Study of the D 0 ?? + ? ? ? 0 decay at BABAR  

Science Conference Proceedings (OSTI)

The Dalitz?plot of the decay D 0 ?? + ? ? ? 0 measured by the BABAR collaboration shows the structure of a final state having quantum numbers I G J PC ?=?0 ? 0 ?? . An isospin analysis of this Dalitz?plot finds that the fraction of the I?=?0 contribution is about 96%. This high I?=?0 contribution is unexpected because the weak interaction violates the isospin.

Mario Gaspero; The BABAR Collaboration

2010-01-01T23:59:59.000Z

394

Higgs Boson Decays into Single Photon plus Unparticle  

E-Print Network (OSTI)

The decay of the standard model Higgs boson into a single photon and a vector unparticle through a one-loop process is studied. For an intermediate mass Higgs boson, this single photon plus unparticle mode can have a branching ratio comparable with the two-photon discovery mode. The emitted photon has a continuous energy spectrum encoding the nature of the recoil unparticle. It can be measured in precision studies of the Higgs boson after its discovery.

Kingman Cheung; Chong Sheng Li; Tzu-Chiang Yuan

2007-11-21T23:59:59.000Z

395

Constraining Light Bosons with Radiative $?(1S)$ Decays  

E-Print Network (OSTI)

Light bosons can be found in large classes of theories beyond the Standard Model. These light bosons may not be ruled out by current experiments and, indeed, may even provide an explanation for some anomalous experimental results. The radiative decays of quarkonium ($c \\bar c, b \\bar b$) states offer a promising opportunity to investigate such light bosons. Specifically, we investigate the reach that current CLEO data can have on models with light scalar and pseudoscalar bosons.

David McKeen

2008-09-27T23:59:59.000Z

396

Electroweak Penguin and Leptonic Decays at BaBar  

SciTech Connect

Recent BABAR results on electroweak penguin and leptonic decays are reviewed. In particular, the measurements of B {yields} K{sup (*)}l{sup +}l{sup -} and the preliminary results on B {yields} X{sub s}l{sup +}l{sup -} are presented. Also summarized are the preliminary limits on B{sup +} {yields} l{sup +}{nu} (l = e,{mu}) and B{sup +} {yields} K{sup +}{nu}{bar {nu}}.

Bucci, F.; /Pisa U. /INFN, Pisa

2005-08-26T23:59:59.000Z

397

A Sterile Neutrino Search with Kaon Decay-at-rest  

E-Print Network (OSTI)

Monoenergetic muon neutrinos (235.5 MeV) from positive kaon decay-at-rest are considered as a source for an electron neutrino appearance search. In combination with a liquid argon time projection chamber based detector, such a source could provide discovery-level sensitivity to the neutrino oscillation parameter space indicative of a sterile neutrino. Current and future intense >3 GeV kinetic energy proton facilities around the world can be employed for this experimental concept.

J. Spitz

2012-03-27T23:59:59.000Z

398

Higgs decay to bottom quarks at the Tevatron  

SciTech Connect

We study the production and detection of the standard-model Higgs boson at the Fermilab Tevatron. The most promising mode is WH and ZH associated production followed by leptonic decay of the weak vector bosons and H {yields} b{bar b}. It may be possible to detect a Higgs boson of mass m{sub H} = 60--80 GeV with 1000 pb{sup {minus}1} of integrated luminosity.

Stange, A.; Marciano, W. [Brookhaven National Lab., Upton, NY (United States); Willenbrock, S. [Fermi National Accelerator Lab., Batavia, IL (United States)]|[Brookhaven National Lab., Upton, NY (United States)

1993-10-01T23:59:59.000Z

399

A New Measurement of the $?^0$ Radiative Decay Width  

E-Print Network (OSTI)

High precision measurements of the differential cross sections for $\\pi^0$ photoproduction at forward angles for two nuclei, $^{12}$C and $^{208}$Pb, have been performed for incident photon energies of 4.9 - 5.5 GeV to extract the ${\\pi^0 \\to \\gamma\\gamma}$ decay width. The experiment was done at Jefferson Lab using the Hall B photon tagger and a high-resolution multichannel calorimeter. The ${\\pi^0 \\to \\gamma\\gamma}$ decay width was extracted by fitting the measured cross sections using recently updated theoretical models for the process. The resulting value for the decay width is $\\Gamma{(\\pi^0 \\to \\gamma\\gamma)} = 7.82 \\pm 0.14 ~({\\rm stat.}) \\pm 0.17 ~({\\rm syst.}) ~{\\rm eV}$. With the 2.8% total uncertainty, this result is a factor of 2.5 more precise than the current PDG average of this fundamental quantity and it is consistent with current theoretical predictions.

I. Larin; D. McNulty; E. Clinton; P. Ambrozewicz; D. Lawrence; I. Nakagawa; Y. Prok; A. Teymurazyan; A. Ahmidouch; A. Asratyan; K. Baker; L. Benton; A. M. Bernstein; V. Burkert; P. Cole; P. Collins; D. Dale; S. Danagoulian; G. Davidenko; R. Demirchyan; A. Deur; A. Dolgolenko; G. Dzyubenko; R. Ent; A. Evdokimov; J. Feng; M. Gabrielyan; L. Gan; A. Gasparian; S. Gevorkyan; A. Glamazdin; V. Goryachev; V. Gyurjyan; K. Hardy; J. He; M. Ito; L. Jiang; D. Kashy; M. Khandaker; P. Kingsberry; A. Kolarkar; M. Konchatnyi; A. Korchin; W. Korsch; S. Kowalski; M. Kubantsev; V. Kubarovsky; X. Li; P. Martel; V. Matveev; B. Mecking; B. Milbrath; R. Minehart; R. Miskimen; V. Mochalov; S. Mtingwa; S. Overby; E. Pasyuk; M. Payen; R. Pedroni; B. Ritchie; T. E. Rodrigues; C. Salgado; A. Shahinyan; A. Sitnikov; D. Sober; S. Stepanyan; W. Stephens; J. Underwood; A. Vasiliev; V. Vishnyakov; M. Wood; S. Zhou

2010-09-09T23:59:59.000Z

400

Analysis of decay heat removal capabilities at Susquehanna  

Science Conference Proceedings (OSTI)

Since the Susquehanna station began operating in 1982, the Nuclear Safety Assessment Group (NSAG) has conducted independent outage safety reviews. In 1990, NSAG published The Outage Planning Information document which consolidated some of the knowledge gained during the outage safety review process. The report discusses the requirements in the technical specifications and it analyzes the decay heat removal problem during the various stages of an outage. The appendices contain facts concerning decay heat generation and the capabilities of the decay heat removal systems. To the maximum extent possible, design documents and certified test data have been used to establish the capabilities of the systems. The Susquehanna station has two General Electric (GE) boiling water reactors (BWR)-4 GE BWR-4 reactors with Mark-2 containments. The safety systems are composed of two independent divisions. The possible heat sinks are the cooling towers via the circulating water and service water systems, the spray pond via the residual heat removal systems, and the atmosphere via boiling.

Miltenberger, J.R. (Pennsylvania Power and Light Co., Allentown (United States)); Henry, R.A. (Pennsylvania Power and Light Co., Berwick (United States))

1992-01-01T23:59:59.000Z

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401

The Effect of Vector Meson Decays on Dihadron Fragmentation Functions  

E-Print Network (OSTI)

Dihadron Fragmentation Functions (DFF) provide a vast amount of information on the intricate details of the parton hadronization process. Moreover, they provide a unique access to the "clean" extraction of nucleon transversity parton distribution functions in semi inclusive deep inelastic two hadron production process with a transversely polarised target. On the example of the u \\to \\pi^+ \\pi^-, we analyse the properties of unpolarised DFFs using their probabilistic interpretation. We use both the NJL-jet hadronization model and PYTHIA 8.1 event generator to explore the effect of the strong decays of the vector mesons produced in the quark hadronization process on the pseudoscalar DFFs. Our study shows that, even though it is less probable to produce vector mesons in the hadronization process than pseudo scalar mesons of the same charge, the products of their strong decays drastically affect the DFFs for pions because of the large combinatorial factors. Thus, an accurate description of both vector meson production and decays are crucial for theoretical understanding of DFFs.

Hrayr H. Matevosyan; Anthony W. Thomas; Wolfgang Bentz

2013-07-30T23:59:59.000Z

402

Concerning the Phases of Annual Variations of Nuclear Decay Rates  

E-Print Network (OSTI)

Recent analyses of datasets acquired at the Brookhaven National Laboratory and at the Physikalisch-Technische Bundesanstalt both show evidence of pronounced annual variations, suggestive of a solar influence. However, the phases of decay-rate maxima do not correspond precisely to the phase of minimum Sun-Earth distance, as might then be expected. We here examine the hypothesis that decay rates are influenced by an unknown solar radiation, but that the intensity of the radiation is influenced not only by the variation in Sun-Earth distance, but also by a possible North-South asymmetry in the solar emission mechanism. We find that this can lead to phases of decay-rate maxima in the range 0 to 0.183 or 0.683 to 1 (September 6 to March 8) but that, according to this hypothesis, phases in the range 0.183 to 0.683 (March 8 to September 6) are "forbidden." We find that phases of the three datasets here analyzed fall in the allowed range.

Peter A. Sturrock; John B. Buncher; Ephraim Fischbach; Daniel Javorsek II; Jere H. Jenkins; Joshua J. Mattes

2011-06-13T23:59:59.000Z

403

Nuclear decay data files of the Dosimetry Research Group  

Science Conference Proceedings (OSTI)

This report documents the nuclear decay data files used by the Dosimetry Research Group at Oak Ridge National Laboratory and the utility DEXRAX which provides access to the files. The files are accessed, by nuclide, to extract information on the intensities and energies of the radiations associated with spontaneous nuclear transformation of the radionuclides. In addition, beta spectral data are available for all beta-emitting nuclides. Two collections of nuclear decay data are discussed. The larger collection contains data for 838 radionuclides, which includes the 825 radionuclides assembled during the preparation of Publications 30 and 38 of the International Commission on Radiological Protection (ICRP) and 13 additional nuclides evaluated in preparing a monograph for the Medical Internal Radiation Dose (MIRD) Committee of the Society of Nuclear Medicine. The second collection is composed of data from the MIRD monograph and contains information for 242 radionuclides. Abridged tabulations of these data have been published by the ICRP in Publication 38 and by the Society of Nuclear Medicine in a monograph entitled ``MIRD: Radionuclide Data and Decay Schemes.`` The beta spectral data reported here have not been published by either organization. Electronic copies of the files and the utility, along with this report, are available from the Radiation Shielding Information Center at Oak Ridge National Laboratory.

Eckerman, K.F.; Westfall, R.J.; Ryman, J.C.; Cristy, M.

1993-12-01T23:59:59.000Z

404

Study of the rare hyperon decay Omega \\to Xi ?^+ ?^-  

E-Print Network (OSTI)

We report a new measurement of the decay \\Omega^- \\to \\Xi^- \\pi^+ \\pi^- with 76 events and a first observation of the decay \\Omega^+ \\to \\Xi^+ \\pi^+ \\pi^- with 24 events, yielding a combined branching ratio (3.74 ^{+0.67}_{-0.56}) \\times 10^{-4}. This represents a factor 25 increase in statistics over the best previous measurement. No evidence is seen for CP violation, with B(\\Omega^- \\to \\Xi^- \\pi^+ \\pi^-)=4.04^{+0.83}_{-0.71} \\times 10^{-4} and B(\\Omega^+ \\to \\Xi^+ \\pi^+ \\pi^-)=3.15^{+1.12}_{-0.89} \\times 10^{-4}. Contrary to theoretical expectation, we see little evidence for the decays \\Omega^- \\to \\Xi_{1530}^{*0} \\pi^- and \\Omega^+ \\to \\Xi_{1530}^{*0} \\pi^+ and place a 90% C.L. upper limit on the combined branching ratio B(\\Omega^-(\\Omega^+) \\to \\Xi^{*0}_{1530}(\\Xi^{*0}_{1530}) \\pi^\\mp)<7.0 \\times 10^{-5}.

HyperCP Collaboration; O. Kamaev; N. Solomey; R. A. Burnstein; A. Chakravorty; Y. C. Chen; W. -S. Choong; K. Clark; E. C. Dukes; C. Durandet; J. Felix; Y. Fu; G. Gidal; H. R. Gustafson; T. Holmstrom; M. Huang; C. James; C. M. Jenkins; T. D. Jones; D. M. Kaplan; M. J. Longo; L. C. Lu; W. Luebke; K. -B. Luk; K. S. Nelson; H. K. Park; J. -P. Perroud; D. Rajaram; H. A. Rubin; J. Volk; C. G. White; S. L. White; P. Zyla

2010-08-25T23:59:59.000Z

405

Sensitivity of CUORE to Neutrinoless Double-Beta Decay  

SciTech Connect

In this paper, we study the sensitivity of CUORE, a bolometric double-beta decay experiment under construction at the Laboratori Nazionali del Gran Sasso in Italy. Two approaches to the computation of experimental sensitivity are discussed and compared, and the formulas and parameters used in the sensitivity estimates are provided. Assuming a background rate of 10{sup -2} cts/(keV kg y), we find that, after 5 years of live time, CUORE will have a 1#27;{sigma} sensitivity to the neutrinoless double-beta decay half-life of {caret T{sup 0{nu}}{sub 1/2}}(1{sigma}#27;) = 1.6x#2;10{sup 26} y and thus a potential to probe the effective Majorana neutrino mass down to 41-95 meV; the sensitivity at 1.64{sigma}#27;, which corresponds to 90% C.L., will be {caret T{sup 0{nu}}{sub 1/2}(1.64{sigma}#27;}) = 9.5x10{sup 25} y. This range is compared with the claim of observation of neutrinoless double-beta decay in {sup 76}Ge and the preferred range in the neutrino mass parameter space from oscillation results.

CUORE; Alessandria, F.; Andreotti, E.; Ardito, R.; Arnaboldi, C.; Avignone III, F. T.; Balata, M.; Bandac, I.; Banks, T. I.; Bari, G.; Beeman, J.; Bellini, F.; Bersani, A.; Biassoni, M.; Bloxham, T.; Brofferio, C.; Bryant, A.; Bucci, C.; Cai, X. Z.; Canonica, L.; Capelli, S.; Carbone, L.; Cardani, L.; Carrettoni, M.; Casali, N.; Chott, N.; Clemenza, M.; Cosmelli, C.; Cremonesi, O.; Creswick, R. J.; Dafinei, I.; Dally, A.; Biasi, A. De; Decowski, M. P.; Deninno, M. M.; Waard, A. de; Domizio, S. Di; Ejzak, L.; Faccini, R.; Fang, D. Q.; Farach, H. A.; Ferri, E.; Ferroni, F.; Fiorini, E.; Foggetta, L.; Franceschi, M. A.; Freedman, S. J.; Frossati, G.; Fujikawa, B. K.; Giachero, A.; Gironi, L.; Giuliani, A.; Gorla, P.; Gotti, C.; Guardincerri, E.; Gutierrez, T. D.; Haller, E. E.; Han, K.; Heeger, K. M.; Huang, H. Z.; Ichimura, K.; Kadel, R.; Kazkaz, K.; Keppel, G.; Kogler, L.; Kolomensky, Yu. G.; Kraft, S.; Lenz, D.; Li, Y. L.; Liu, X.; Longo, E.; Ma, Y. G.; Maiano, C.; Maier, G.; Maino, M.; Mancini, C.; Martinez, C.; Martinez, M.; Maruyama, R. H.; Moggi, N.; Morganti, S.; Napolitano, T.; Newman, S.; Nisi, S.; Nones, C.; Norman, E. B.; Nucciotti, A.; Orio, F.; Orlandi, D.; Ouellet, J. L.; Pallavicini, M.; Palmieri, V.; Pattavina, L.; Pavan, M.; Pedretti, M.; Pessina, G.; Pirro, S.; Previtali, E.; Rampazzo, V.; Rimondi, F.; Rosenfeld, C.; Rusconi, C.; Salvioni, C.; Sangiorgio, S.; Schaeffer, D.; Scielzo, N. D.; Sisti, M.; Smith, A. R.; Stivanello, F.; Taffarello, L.; Terenziani, G.; Tian, W. D.; Tomei, C.; Trentalange, S.; Ventura, G.; Vignati, M.; Wang, B. S.; Wang, H. W.; Whitten Jr., C. A.; Wise, T.; Woodcraft, A.; Xu, N.; Zanotti, L.; Zarra, C.; Zhu, B. X.; Zucchelli, S.

2011-11-23T23:59:59.000Z

406

Search for T violation in charm meson decays  

SciTech Connect

Using data from the FOCUS (E831) experiment, they have searched for T violation in charm meson decays using the four-body decay channels D{sup 0} {yields} K{sup -}K{sup +} {pi}{sup -}{pi}{sup +}, D{sup +} {yields} K{sub S}{sup 0}K{sup +}{pi}{sup -}{pi}{sup +}, and D{sub s}{sup +} {yields} K{sub S}{sup 0}K{sup +}{pi}{sup -}{pi}{sup +}. The T violation asymmetry is obtained using triple-product correlations and assuming the validity of the CPT theorem. They find the asymmetry values to be A{sub T{sub viol}}(D{sup 0}) = 0.010 {+-} 0.057(stat.) {+-} 0.037(syst.), A{sub T{sub viol}}(D{sup +}) = 0.023 {+-} 0.062(stat.) {+-} 0.022(syst.), and A{sub T{sub viol}}(D{sub s}{sup +}) = -0.036 {+-} 0.067(stat.) {+-} 0.023(syst.). Each measurement is consistent with no T violation. New measurements of the CP asymmetries for some of these decay modes are also presented.

Link, J.M.; Yager, P.M.; /UC, Davis; Anjos, J.C.; Bediaga, I.; Castromonte, C.; Machado, A.A.; Magnin, J.; Massafferri, A.; de Miranda, J.M.; Pepe, I.M.; Polycarpo, E.; dos Reis, A.C.; /Rio de Janeiro, CBPF; Carrillo, S.; Casimiro, E.; Cuautle, E.; Sanchez-Hernandez, A.; Uribe, C.; Vazquez, F.; /CINVESTAV, IPN; Agostino, L.; Cinquini, L.; Cumalat, J.P.; /Colorado U. /Fermilab /Frascati /Guanajuato U. /Illinois U., Urbana /Indiana U. /Korea U. /Kyungpook Natl. U. /INFN, Milan /Milan U. /North Carolina U. /Pavia U. /INFN, Pavia /Rio de Janeiro, Pont. U. Catol. /Puerto Rico U., Mayaguez /South Carolina U. /Tennessee U. /Vanderbilt U. /Wisconsin U., Madison

2005-06-01T23:59:59.000Z

407

Precise Measurement of the K - to Pi -E E- Decay  

SciTech Connect

A sample of 7253 K{sup {+-}} {yields} {pi}{sup {+-}}e{sup +}e{sup -}({gamma}) decay candidates with 1.0% background contamination has been collected by the NA 48/2 experiment at the CERN SPS, which allowed a precise measurement of the decay properties. The branching ratio in the full kinematic range was measured to be BR = (3.11 {+-} 0.12) x 10{sup -7}, where the uncertainty includes also the model dependence. The shape of the form factor W(z), where z = (M{sub ee}/M{sub K}){sup 2}, was parameterized according to several models, and, in particular, the slope {delta} of the linear form factor W(z) = W{sub 0}(1 + {delta}z) was determined to be {delta} = 2.32 {+-} 0.18. A possible CP violating asymmetry of K{sup +} and K{sup -} decay widths was investigated, and a conservative upper limit of 2.1 x 10{sup -2} at 90% CL was established.

Batley, J.R.; Culling, A.J.; Kalmus, G.; /Cambridge U.; Lazzeroni, C.; /Cambridge U. /Birmingham U.; Munday, D.J.; /Cambridge U.; Slater, M.W.; /Cambridge U. /Birmingham U.; Wotton, S.A.; /Cambridge U.; Arcidiacono, R.; /CERN /Turin U. /INFN, Turin; Bocquet, G.; /CERN; Cabibbo, N.; /CERN /Rome U. /INFN, Rome; Ceccucci, A.; /CERN; Cundy, D.; /CERN /Turin, Cosmo-Geofisica Lab; Falaleev, V.; Fidecaro, M.; Gatignon, L.; Gonidec, A.; Kubischta, W.; /CERN; Norton, A.; /CERN /Ferrara U. /INFN, Ferrara; Maier, A.; Patel, M.; Peters, A.; /CERN /Dubna, JINR /Pisa, Scuola Normale Superiore /Dubna, JINR /Dubna, JINR /Birmingham U. /Dubna, JINR /CERN /Dubna, JINR /Dubna, JINR /Sofiya U. /Dubna, JINR /Dubna, JINR /INFN, Perugia /Dubna, JINR /Dubna, JINR /Northwestern U. /Dubna, JINR /Chicago U., EFI /Marseille, CPPM /Chicago U., EFI /Edinburgh U. /George Mason U. /Edinburgh U. /Ferrara U. /INFN, Ferrara /Ferrara U. /INFN, Ferrara /CERN /Ferrara U. /INFN, Ferrara /Florence U. /INFN, Florence /Modena U. /Florence U. /INFN, Florence /Florence U. /INFN, Florence /Urbino U. /Florence U. /INFN, Florence /Pisa, Scuola Normale Superiore /Florence U. /INFN, Florence /Urbino U. /Mainz U., Inst. Phys. /Mainz U., Inst. Phys. /Bonn U. /Mainz U., Inst. Phys. /Northwestern U. /SLAC /Northwestern U. /Northwestern U. /Royal Holloway, U. of London /Northwestern U. /Northwestern U. /UCLA /Perugia U. /INFN, Perugia /Perugia U. /INFN, Perugia /Frascati /Perugia U. /INFN, Perugia /INFN, Pisa /Pisa, Scuola Normale Superiore /INFN, Pisa /Pisa U. /INFN, Pisa /Pisa U. /INFN, Pisa /Barcelona, IFAE /Pisa U. /INFN, Pisa /DAPNIA, Saclay /DAPNIA, Saclay /CERN /DAPNIA, Saclay /Siegen U. /Turin U. /INFN, Turin /Bern U. /Turin U. /INFN, Turin /Turin U. /INFN, Turin /CERN /Turin U. /INFN, Turin /Madrid, CIEMAT /Turin U. /INFN, Turin /Vienna, OAW

2011-11-22T23:59:59.000Z

408

COSMIC MICROWAVE BACKGROUND CONSTRAINTS OF DECAYING DARK MATTER PARTICLE PROPERTIES  

SciTech Connect

If a component of cosmological dark matter is made up of massive particles-such as sterile neutrinos-that decay with cosmological lifetime to emit photons, the reionization history of the universe would be affected, and cosmic microwave background anisotropies can be used to constrain such a decaying particle model of dark matter. The optical depth depends rather sensitively on the decaying dark matter particle mass m{sub dm}, lifetime {tau}{sub dm}, and the mass fraction of cold dark matter f that they account for in this model. Assuming that there are no other sources of reionization and using the Wilkinson Microwave Anisotropy Probe 7-year data, we find that 250 eV {approx}< m{sub dm} {approx}< 1 MeV, whereas 2.23 Multiplication-Sign 10{sup 3} yr {approx}< {tau}{sub dm}/f {approx}< 1.23 Multiplication-Sign 10{sup 18} yr. The best-fit values for m{sub dm} and {tau}{sub dm}/f are 17.3 keV and 2.03 Multiplication-Sign 10{sup 16} yr, respectively.

Yeung, S.; Chan, M. H.; Chu, M.-C., E-mail: mcchu@phy.cuhk.edu.hk [Department of Physics and Institute of Theoretical Physics, Chinese University of Hong Kong, Shatin, New Territories (Hong Kong)

2012-08-20T23:59:59.000Z

409

Some Comments on the Decays of eta (550)  

DOE R&D Accomplishments (OSTI)

Various decay modes of the {eta}(500) are discussed. The relations, through SU{sub 3} and the Gell-Mann, Sharp, Wagner model, between the {eta}-decay modes and the modes {eta} {yields} {pi}{pi}{gamma), {pi}{sup 0} {yields} {gamma}{gamma} are investigated taking into account {eta}-{eta}{sup *} mixing. The present experimental values for the neutral branching ratios plus the shape of the {eta} {yields} {pi}{sup +}{pi}{sup {minus}}{pi}{sup 0} Dalitz plot are shown to require a 25% {vert_bar}{Delta}{rvec I}{vert_bar} = 3 contribution to the {eta} {yields} 3{pi} amplitude. The connection between a possible charge asymmetry in {eta} {yields} {pi}{sup +}{pi}{sup {minus}}{pi}{sup 0} and the branching ratio {Gamma}{sub {eta} {yields} {pi}{sup 0}e{sup +}e{sup {minus}}}/{Gamma}{sub {eta}}{sup all} is investigated in the framework of a model proposed earlier by several authors. It is shown that there is no conflict between the existing data and this model. The Dalitz plot distribution of {eta} {yields} {pi}{sup +}{pi}{sup {minus}}{pi}{sup 0} is discussed under various assumptions about the properties of the interaction responsible for the decay. (auth)

Veltman, M.; Yellin, J.

1966-07-00T23:59:59.000Z

410

CP violation in three-body chargino decays  

Science Conference Proceedings (OSTI)

CP violation in supersymmetry can give rise to rate asymmetries in the decays of supersymmetric particles. In this work we compute the rate asymmetries for the three-body chargino decays {chi}-tilde{sub 2}{sup {+-}}{yields}{chi}-tilde{sub 1}{sup {+-}}HH, {chi}-tilde{sub 2}{sup {+-}}{yields}{chi}-tilde{sub 1}{sup {+-}}ZZ, {chi}-tilde{sub 2}{sup {+-}}{yields}{chi}-tilde{sub 1}{sup {+-}}W{sup +}W{sup -} and {chi}-tilde{sub 2}{sup {+-}}{yields}{chi}-tilde{sub 1}{sup {+-}}ZH. Each of the decays contains contributions mediated by neutral Higgs bosons that can possibly go on shell. Such contributions receive a resonant enhancement; furthermore, the strong phases required for the CP asymmetries come from the widths of the exchanged Higgs bosons. Our results indicate that the rate asymmetries can be relatively large in some cases, while still respecting a number of important low-energy bounds such as those coming from B meson observables and electric dipole moments. For the parameters that we consider, rate asymmetries of order 10% are possible in some cases.

Nagashima, Makiko; Szynkman, Alejandro; London, David [Physique des Particules, Universite de Montreal, C.P. 6128, succursale centre-ville, Montreal, QC, Canada H3C 3J7 (Canada); Kiers, Ken; Hanchey, Jenna; Little, Kevin [Physics and Engineering Department, Taylor University, 236 West Reade Avenue, Upland, Indiana 46989 (United States)

2009-11-01T23:59:59.000Z

411

FORM FACTORS FOR RADIATIVE PION AND KAON DECAYS Updated August  

NLE Websites -- All DOE Office Websites (Extended Search)

August August 2009 by W. Bertl (Paul Scherrer Inst.) The radiative decays, π ± → l ± νγ and K ± → l ± νγ, with l standing for an e or a µ, and γ for a real or virtual photon (e + e - pair), provide a powerful tool to investigate the hadronic structure of pions and kaons. The structure-dependent part SD i of the amplitude describes the emission of photons from virtual hadronic states, and is parametrized in terms of form factors F i , with i = V, A (vector, axial vector), in the standard description [1,2]. Exotic, non-standard contributions like i = T, S (tensor, scalar) have also been considered, and we shall discuss them below. Apart from the SD terms, the decay amplitude depends also on Inner Bremsstrahlung IB from the weak decay π ± (K ± ) → l ± ν accompanied by the photon radiated from the external charged particles. Naturally, experiments try to optimize their kinematics so as to minimize

412

Local decay of waves on asymptotically flat stationary space-times  

E-Print Network (OSTI)

In this article we study the pointwise decay properties of solutions to the wave equation on a class of stationary asymptotically flat backgrounds in three space dimensions. Under the assumption that uniform energy bounds and a weak form of local energy decay hold forward in time we establish a $t^{-3}$ local uniform decay rate for linear waves. This work was motivated by open problems concerning decay rates for linear waves on Schwarzschild and Kerr backgrounds, where such a decay rate has been conjectured by R. Price. Our results apply to both of these cases.

Tataru, Daniel

2009-01-01T23:59:59.000Z

413

Local decay of waves on asymptotically flat stationary space-times  

E-Print Network (OSTI)

In this article we study the pointwise decay properties of solutions to the wave equation on a class of stationary asymptotically flat backgrounds in three space dimensions. Under the assumption that uniform energy bounds and a weak form of local energy decay hold forward in time we establish a $t^{-3}$ local uniform decay rate for linear waves. This work was motivated by open problems concerning decay rates for linear waves on Schwarzschild and Kerr backgrounds, where such a decay rate has been conjectured by R. Price. Our results apply to both of these cases.

Daniel Tataru

2009-10-28T23:59:59.000Z

414

The Wisconsin H-Alpha Mapper Northern Sky Survey  

E-Print Network (OSTI)

The Wisconsin H-Alpha Mapper (WHAM) has completed a survey in Balmer Alpha of the entire Northern sky above declination -30 deg. This survey provides the first calibrated, velocity-resolved map of the H-Alpha emission from the Galaxy. With one-degree spatial resolution, 12 km s^{-1} velocity resolution, and sensitivity to features as faint as 0.1 R (EM ~ 0.2 cm^{-6} pc), this survey provides the deepest maps of the ionized content of the Galaxy to date. In addition to probing the detailed kinematic structure of the Warm Ionized Medium and the vertical structure of the ionized content in spiral arms, initial results include the discovery of several faint, extended (d > 1\\deg) H II regions and the first map of the ionized component of an intermediate velocity cloud.

L. M. Haffner

2000-10-04T23:59:59.000Z

415

$\\rho-\\omega-$Interference in $J/\\psi-$Decays and $\\rho\\to \\pi^+\\pi^-\\pi^0$ Decay  

E-Print Network (OSTI)

We study $\\rho-\\omega-$interference by analyzing $J/\\psi\\to \\pi^+\\pi^-\\pi^0\\pi^0$. PDG-2002 data on $J/\\psi$ decays into $PP$ and $PV$ ($P$ denotes pseudoscalar mesons; $V$, vector mesons) are used to fit a generic model which describes the $J/\\psi$ decays. From the fits, we obtain anomalously large branching ratio $Br(\\rho^0\\to \\pi^+\\pi^-\\pi^0)\\sim 10^{-3}-10^{-2}$. A theoretical analysis for it is also provided, and the prediction is in good agreement with the anomalously large $Br(\\rho^0\\to \\pi^+\\pi^-\\pi^0)$. By the fit, we also get the $\\eta-\\eta'-$mixing angle $\\theta=-19.68^o\\pm 1.49^o$ and the constituent quark mass ratio $m_u/m_s\\sim 0.6$ which are all reasonable.

Fang, L; Huang, Y B; Yan, M L; Fang, Liu; Jin, Li; Huang, Yi-Bin; Yan, Mu-Lin

2004-01-01T23:59:59.000Z

416

Some numerical reslts on best uniform polynomial approximation of {chi}{sup {alpha}} on [0,1  

Science Conference Proceedings (OSTI)

Let {alpha} be a positive number, and let E{sub n}(chi{sup {alpha}}; [0,1]) denote the error of best uniform approximation to {chi}{sup {alpha}}, by polynomials of degree at most n, on the interval [0,1]. The Russian mathematician S.N. Bernstein established the existence of a nonnegative constant {Beta}({alpha}) such that {Beta}({alpha}):= {sub n{yields}{infinity}lim(2n){sup 2{alpha}}E{sub n}({chi}{sup {alpha}};[0.1]). In addition, Bernstein showed that {Beta}{alpha} 0) and that {Gamma}(2{alpha}){vert_bar}sin({pi}{alpha}){vert_bar}/{pi} (1{minus}1/2{alpha}{minus}1) {1/2}), so that the asymptotic behavior of {Beta}({alpha}) is known when {alpha}{yields}{infinity}. Still, the problem of trying to determine {Beta}({alpha}) more precisely, for all {alpha} > 0, is intriguing. To this end, we have rigorously determined the numbers for thirteen values of {alpha}, where these numbers were calculated with a precision of at least 200 significant digits. For each of these thirteen values of {alpha}, Richardson`s extrapolation was applied to the products to obtain estimates of {Beta}({alpha}) to approximately 40 decimal places. Included are graphs of the points ({alpha},{Beta}({alpha})) for the thirteen values of {alpha} that we considered.

Carpenter, A.J.; Varga, R.S.

1992-07-01T23:59:59.000Z

417

Flavor SU(3) analysis of charmless $B$ meson decays to two pseudoscalar mesons  

E-Print Network (OSTI)

Global fits to charmless B --> PP decays in the framework of flavor SU(3) symmetry are updated and improved without reference to the \\sin2\\beta measured from the charmonium decay modes. Fit results directly constrain the (\\bar\\rho,\\bar\\eta) vertex of the unitarity triangle, and are used to predict the branching ratios and CP asymmetries of all decay modes, including those of the B_s system. Different schemes of SU(3) breaking in decay amplitude sizes are analyzed. The major breaking effect between strangeness-conserving and strangeness-changing decays can be accounted for by including a ratio of decay constants in tree and color-suppressed amplitudes. The possibility of having a new physics contribution to K \\pi decays is also examined from the data fitting point of view.

Chiang, C W; Chiang, Cheng-Wei; Zhou, Yu-Feng

2006-01-01T23:59:59.000Z

418

Searches for new quarks and leptons in Z boson decays  

SciTech Connect

Searches for the decay of Z bosons into pairs of new quarks and leptons in a data sample including 455 hadronic Z decays are presented. The Z bosons were produced in electon-positron annihilations at the SLAC Linear Collider operating in the center-of-mass energy range from 89.2 to 93.0 GeV. The Standard Model provides no prediction for fermion masses and does not exclude new generations of fermions. The existence and masses of these new particles may provide valuable information to help understand the pattern of fermion masses, and physics beyond the Standard Model. Specific searches for top quarks and sequential fourth generation charge--1/3(b{prime}) quarks are made considering a variety of possible standard and non-standard decay modes. In addition, searches for sequential fourth generation massive neutrinos {nu}{sub 4} and their charged lepton partners L{sup {minus}} are pursued. The {nu}{sub 4} may be stable or decay through mixing to the lighter generations. The data sample is examined for new particle topologies of events with high-momentum isolated tracks, high-energy isolated photons, spherical event shapes, and detached vertices. No evidence is observed for the production of new quarks and leptons. 95% confidence lower mass limits of 40.7 GeV/c{sup 2} for the top quark and 42.0 GeV/c{sup 2} for the b{prime}-quark mass are obtained regardless of the branching fractions to the considered decay modes. A significant range of mixing matrix elements of {nu}{sub 4} to other generation neutrinos for a {nu}{sub 4} mass from 1 GeV/c{sup 2} to 43 GeV/c{sup 2} is excluded at 95% confidence level. Measurements of the upper limit of the invisible width of the Z exclude additional values of the {nu}{sub 4} mass and mixing matrix elements, and also permit the exclusion of a region in the L{sup {minus}} mass versus {nu}{sub 4} mass plane.

Van Kooten, R.J.

1990-06-01T23:59:59.000Z

419

NON-THERMAL RESPONSE OF THE CORONA TO THE MAGNETIC FLUX DISPERSAL IN THE PHOTOSPHERE OF A DECAYING ACTIVE REGION  

Science Conference Proceedings (OSTI)

We analyzed Solar Dynamics Observatory line-of-sight magnetograms for a decaying NOAA active region (AR) 11451 along with co-temporal Extreme-Ultraviolet Imaging Spectrometer (EIS) data from the Hinode spacecraft. The photosphere was studied via time variations of the turbulent magnetic diffusivity coefficient, {eta}(t), and the magnetic power spectrum index, {alpha}, through analysis of magnetogram data from the Helioseismic and Magnetic Imager (HMI). These measure the intensity of the random motions of magnetic elements and the state of turbulence of the magnetic field, respectively. The time changes of the non-thermal energy release in the corona was explored via histogram analysis of the non-thermal velocity, v {sub nt}, in order to highlight the largest values at each time, which may indicate an increase in energy release in the corona. We used the 10% upper range of the histogram of v {sub nt} (which we called V {sup upp} {sub nt}) of the coronal spectral line of Fe XII 195 A. A 2 day time interval was analyzed from HMI data, along with the EIS data for the same field of view. Our main findings are the following. (1) The magnetic turbulent diffusion coefficient, {eta}(t), precedes the upper range of the v {sub nt} with the time lag of approximately 2 hr and the cross-correlation coefficient of 0.76. (2) The power-law index, {alpha}, of the magnetic power spectrum precedes V {sup upp} {sub nt} with a time lag of approximately 3 hr and the cross-correlation coefficient of 0.5. The data show that the magnetic flux dispersal in the photosphere is relevant to non-thermal energy release dynamics in the above corona. The results are consistent with the nanoflare mechanism of the coronal heating, due to the time lags being consistent with the process of heating and cooling the loops heated by nanoflares.

Harra, L. K. [UCL-Mullard Space Science Laboratory, Holmbury St. Mary, Dorking, Surrey, RH5 6NT (United Kingdom); Abramenko, V. I. [Big Bear Solar Observatory, 40386 N. Shore Lane, Big Bear City, CA 92314 (United States)

2012-11-10T23:59:59.000Z

420

Alpha low-level stored waste systems design study  

SciTech Connect

The Stored Waste System Design Study (SWSDS), commissioned by the Waste Technology Development Department at the Idaho National Engineering Laboratory (INEL), examines relative life-cycle costs associated with three system concepts for processing the alpha low-level waste (alpha-LLW) stored at the Radioactive Waste Management Complex`s Transuranic Storage Area at the INEL. The three system concepts are incineration/melting; thermal treatment/solidification; and sort, treat, and repackage. The SWSDS identifies system functional and operational requirements and assesses implementability; effectiveness; cost; and demonstration, testing, and evaluation (DT&E) requirements for each of the three concepts.

Feizollahi, F.; Teheranian, B. [Morrison Knudson Corp., San Francisco, CA (United States). Environmental Services Div.; Quapp, W.J. [EG and G Idaho, Inc., Idaho Falls, ID (United States)

1992-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "alpha decay suspected" from the National Library of EnergyBeta (NLEBeta).
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421

Alpha low-level stored waste systems design study  

SciTech Connect

The Stored Waste System Design Study (SWSDS), commissioned by the Waste Technology Development Department at the Idaho National Engineering Laboratory (INEL), examines relative life-cycle costs associated with three system concepts for processing the alpha low-level waste (alpha-LLW) stored at the Radioactive Waste Management Complex's Transuranic Storage Area at the INEL. The three system concepts are incineration/melting; thermal treatment/solidification; and sort, treat, and repackage. The SWSDS identifies system functional and operational requirements and assesses implementability; effectiveness; cost; and demonstration, testing, and evaluation (DT E) requirements for each of the three concepts.

Feizollahi, F.; Teheranian, B. (Morrison Knudson Corp., San Francisco, CA (United States). Environmental Services Div.); Quapp, W.J. (EG and G Idaho, Inc., Idaho Falls, ID (United States))

1992-08-01T23:59:59.000Z

422

Humidity response of the Eberline model PAC-7 alpha instrument  

SciTech Connect

Response of the Eberline Model PAC-7 alpha instrument under varying relative humidity (RH) and temperature conditions was studied in an environmental chamber. Electric discharges resulting in spurious counts or in instrument paralysis occurred at 35 to 50% RH. Improvement in the RH level tolerated by the PAC-7 alpha instrument was obtained by conformal coating of the high-voltage region of the printed circuit (PC) board. Following this treatment, electric discharges occurred only at relatively high humidity levels and then as a result of high-voltage breakdown within the AC-24C probe rather than within the PC board.

McAtee, J.L.

1981-04-01T23:59:59.000Z

423

First-principles elastic properties of (alpha)-Pu  

SciTech Connect

Density-functional electronic structure calculations have been used to investigate the ambient pressure and low temperature elastic properties of the ground-state {alpha} phase of plutonium metal. The electronic structure and correlation effects are modeled within a fully relativistic anti-ferromagnetic treatment with a generalized gradient approximation for the electron exchange and correlation functionals. The 13 independent elastic constants, for the monoclinic {alpha}-Pu system, are calculated for the observed geometry. A comparison of the results with measured data from resonant ultrasound spectroscopy for a cast sample is made.

Soderlind, P; Klepeis, J E

2008-11-04T23:59:59.000Z

424

Inelastic {sup 17}F(p,p){sup 17}F scattering at E{sub c.m.}=3 MeV and the {sup 14}O(alpha,p){sup 17}F reaction rate  

Science Conference Proceedings (OSTI)

The {sup 14}O(alpha,p){sup 17}F reaction is an important trigger reaction leading to the alphap process in x-ray bursts. The inclusion of reaction channels populating excited {sup 17}F levels may significantly increase the calculated {sup 14}O(alpha,p){sup 17}F reaction rate. A radioactive {sup 17}F beam was used at the Oak Ridge National Laboratory Holifield Radioactive Ion Beam Facility to search for a {sup 18}Ne resonance at E{sub c.m.}({sup 17}F+p)approx =3.1 MeV that had been previously suggested to decay strongly to the first excited level in {sup 17}F. No evidence, however, of inelastic {sup 17}F+p scattering was observed at this energy, and an upper limit of approx10 mb has been set on the inelastic-scattering cross section.

Bardayan, D. W.; Nesaraja, C. D.; Smith, M. S. [Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States); Blackmon, J. C.; Matos, M. [Deptartment of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803 (United States); Chae, K. Y.; Moazen, B. H.; Pittman, S. T. [Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996 (United States); Howard, M. E.; Peters, W. A.; Spassova, I. [Department of Physics and Astronomy, Rutgers University, New Brunswick, New Jersey 08903 (United States); Matei, C. [Oak Ridge Associated Universities, Oak Ridge, Tennessee 37830 (United States); Martin, W. [Department of Electrical Engineering and Computer Science, University of Tennessee, Knoxville, Tennessee 37996 (United States)

2010-06-15T23:59:59.000Z

425

Gross alpha/beta determination by liquid scintillation counting  

Science Conference Proceedings (OSTI)

Liquid scintillation counting (LSC) is used to assay liquid samples for both gross alpha and gross beta (including tritium) activity in order to declare these samples clean.'' This method provides several advantages over traditional gross assay techniques including easy sample preparation, no sample self-absorption, short counting times, acceptable lower limits of detection (LLD's), and convenient sample disposal.

Leyba, J.D.

1992-03-01T23:59:59.000Z

426

Gross alpha/beta determination by liquid scintillation counting  

Science Conference Proceedings (OSTI)

Liquid scintillation counting (LSC) is used to assay liquid samples for both gross alpha and gross beta (including tritium) activity in order to declare these samples ``clean.`` This method provides several advantages over traditional gross assay techniques including easy sample preparation, no sample self-absorption, short counting times, acceptable lower limits of detection (LLD`s), and convenient sample disposal.

Leyba, J.D.

1992-03-01T23:59:59.000Z

427

PROBING PRIMORDIAL MAGNETIC FIELDS USING Ly{alpha} CLOUDS  

SciTech Connect

From previous studies of the effect of primordial magnetic fields on early structure formation, we know that the presence of primordial magnetic fields during early structure formation could induce more perturbations at small scales (at present 1-10 h {sup -1} Mpc) as compared to the usual {Lambda}CDM theory. Matter power spectra over these scales are effectively probed by cosmological observables such as shear correlation and Ly{alpha} clouds. In this paper we discuss the implications of primordial magnetic fields on the distribution of Ly{alpha} clouds. We simulate the line-of-sight density fluctuation including the contribution coming from the primordial magnetic fields. We compute the evolution of Ly{alpha} opacity for this case and compare our theoretical estimates of Ly{alpha} opacity with the existing data to constrain the parameters of the primordial magnetic fields. We also discuss the case when the two density fields are correlated. Our analysis yields an upper bound of roughly 0.3-0.6 nG on the magnetic field strength for a range of nearly scale-invariant models, corresponding to a magnetic field power spectrum index n {approx_equal} -3.

Pandey, Kanhaiya L.; Sethi, Shiv K. [Raman Research Institute, Bangalore 560080 (India)] [Raman Research Institute, Bangalore 560080 (India)

2013-01-01T23:59:59.000Z

428

Alpha-tricalcium phosphate-calcium sulfate hybrid bone cement ...  

Science Conference Proceedings (OSTI)

Presentation Title, Alpha-tricalcium phosphate-calcium sulfate hybrid bone ... electron scanning microscopy on the characterization of polymer coating ... Improving the Resistance to Contact and Flexural Damage of Ceramics Using Elastic Gradients ... using phosphoric acid activation by ultrasound and microwave radiation...

429

Superscalar Instruction Execution in the 21164 Alpha Microprocessor  

E-Print Network (OSTI)

The 21164 is a new quad-issue, superscalar Alpha microprocessor that executes 1.2 billion instructions per second. Available this January, the 3OO-MHz,0.5-pm CMOS chip delivers an estimated 345/505 SPECint92/SPECfp92 performance. The design's high clock rate, low operational latency, and high-throughput/nonblocking memory systems contribute to this performance.

John H. Edmondson; Paul Rubinfeld; Ronald Preston; Vidya Rajagopalan

1995-01-01T23:59:59.000Z

430

First Results from the Large Area Lyman $\\alpha$ Survey  

E-Print Network (OSTI)

We report on a new survey for z=4.5 Lyman alpha sources, the Large Area Lyman Alpha (LALA) survey. Our survey achieves an unprecedented combination of volume and sensitivity by using narrow-band filters on the new 8192x8192 pixel CCD Mosaic Camera at the 4 meter Mayall telescope of Kitt Peak National Observatory. Well-detected sources with flux and equivalent width matching known high redshift Lyman alpha galaxies (i.e., observed equivalent width above 80 Angstroms and line+continuum flux between 2.6e-17 and 5.2e-17 erg/cm^2/sec in an 80 Angstrom filter) have an observed surface density corresponding to 11000 +- 700 per square degree per unit redshift at z=4.5. Spatial variation in this surface density is apparent on comparison between counts in 6561 and 6730 Angstrom filters. Early spectroscopic followup results from the Keck telescope included three sources meeting our criteria for good Lyman alpha candidates. Of these, one is confirmed as a z=4.52 source, while another remains consistent with either z=4.55...

Rhoads, J E; Dey, A; Stern, D; Spinrad, H; Jannuzi, B; Rhoads, James E.; Malhotra, Sangeeta; Dey, Arjun; Stern, Daniel; Spinrad, Hyron; Jannuzi, Buell

2000-01-01T23:59:59.000Z

431

TAE SATURATION OF ALPHA PARTICLE DRIVEN INSTABILITY IN TFTR  

E-Print Network (OSTI)

TAE SATURATION OF ALPHA PARTICLE DRIVEN INSTABILITY IN TFTR N. N. Gorelenkovy, Y. Chen, R. B. White. In this paper we apply a recently developed nonlinear theory of kinetic instabilities [5] to calculate calculation had been added to allow an accurate numerical integration of Eq.(14) over the phase space

432

Economic analyses of alpha channeling in tokamak power plants.  

SciTech Connect

The hot-ion-mode of operation [1] has long been thought to offer optimized performance for long-pulse or steady-state magnetic fusion power plants. This concept was revived in recent years when theoretical considerations suggested that nonthermal fusion alpha particles could be made to channel their power density preferentially to the fuel ions [2,3]. This so-called anomalous alpha particle slowing down can create plasmas with fuel ion temperate T{sub i} somewhat larger than the electron temperature T{sub e}, which puts more of the beta-limited plasma pressure into the useful fuel species (rather than non-reacting electrons). As we show here, this perceived benefit may be negligible or nonexistent for tokamaks with steady state current drive. It has likewise been argued [2,3] that alpha channeling could be arranged such that little or no external power would be needed to generate the steady state toroidal current. Under optimistic assumptions we show that such alpha-channeling current drive would moderately improve the economic performance of a first stability tokamak like ARIES-I [4], however a reversed-shear (advanced equilibrium) tokamak would likely not benefit since traditional radio-wave (rf) electron-heating current drive power would already be quite small.

Ehst, D.A.

1998-09-17T23:59:59.000Z

433

Measurement of CP Asymmetries and Branching Fractions in Charmless Two-Body B-Meson Decays to Pions and Kaons  

SciTech Connect

We present improved measurements of CP-violation parameters in the decays B{sup 0} {yields} {pi}{sup +}{pi}{sup -}, B{sup 0} {yields} K{sup +}{pi}{sup -}, and B{sup 0} {yields} {pi}{sup 0}{pi}{sup 0}, and of the branching fractions for B{sup 0} {yields} {pi}{sup 0}{pi}{sup 0} and B{sup 0} {yields} K{sup 0}{pi}{sup 0}. The results are obtained with the full data set collected at the {Upsilon}(4S) resonance by the BABAR experiment at the PEP-II asymmetric-energy B factory at the SLAC National Accelerator Laboratory, corresponding to 467 {+-} 5 million B{bar B} pairs. We find the CP-violation parameter values and branching fractions S{sub {pi}{sup +}{pi}{sup -}} = -0.68 {+-} 0.10 {+-} 0.03, C{sub {pi}{sup +}{pi}{sup -}} = -0.25 {+-} 0.08 {+-} 0.02, {Alpha}{sub K{sup -}{pi}{sup +}} = -0.107 {+-} 0.016{sub -0.004}{sup +0.006}, C{sub {pi}{sup 0}{pi}{sup 0}} = -0.43 {+-} 0.26 {+-} 0.05, {Beta}(B{sup 0} {yields} {pi}{sup 0}{pi}{sup 0}) = (1.83 {+-} 0.21 {+-} 0.13) x 10{sup -6}, {Beta}(B{sup 0} {yields} K0{pi}{sup 0}) = (10.1 {+-} 0.6 {+-} 0.4) x 10{sup -6}, where in each case, the first uncertainties are statistical and the second are systematic. We observe CP violation with a significance of 6.7 standard deviations for B{sup 0} {yields} {pi}{sup +}{pi}{sup -} and 6.1 standard deviations for B{sup 0} {yields} K{sup +}{pi}{sup -}, including systematic uncertainties. Constraints on the Unitarity Triangle angle {alpha} are determined from the isospin relations among the B {yields} {pi}{pi} rates and asymmetries. Considering only the solution preferred by the Standard Model, we find {alpha} to be in the range [71{sup o}, 109{sup o}] at the 68% confidence level.

Lees, J.P.; Poireau, V.; Tisserand, V.; /Annecy, LAPP; Garra Tico, J.; Grauges, E.; /Barcelona U., ECM; Palano, A.; /Bari U. /INFN, Bari; Eigen, G.; Stugu, B.; /Bergen U.; Brown, D.N.; Kerth, L.T.; Kolomensky, Yu.G.; Lynch, G.; /LBL, Berkeley /UC, Berkeley; Koch, H.; Schroeder, T.; /Ruhr U., Bochum; Asgeirsson, D.J.; Hearty, C.; Mattison, T.S.; McKenna, J.A.; So, R.Y.; /British Columbia U.; Khan, A.; /Brunel U.; Blinov, V.E.; /Novosibirsk, IYF /UC, Irvine /UC, Riverside /UC, Santa Barbara /UC, Santa Cruz /Caltech /Cincinnati U. /Colorado U. /Colorado State U. /Dortmund U. /Dresden, Tech. U. /Ecole Polytechnique /Edinburgh U. /Ferrara U. /INFN, Ferrara /Frascati /Genoa U. /INFN, Genoa /Indian Inst. Tech., Guwahati /Harvard U. /Harvey Mudd Coll. /Heidelberg U. /Humboldt U., Berlin /Imperial Coll., London /Iowa State U. /Iowa State U. /Johns Hopkins U. /Orsay, LAL /LLNL, Livermore /Liverpool U. /Queen Mary, U. of London /Royal Holloway, U. of London /Louisville U. /Mainz U., Inst. Kernphys. /Manchester U., Comp. Sci. Dept. /Maryland U. /Massachusetts U., Amherst /MIT /McGill U. /Milan U. /INFN, Milan /Mississippi U. /Montreal U. /Naples U. /INFN, Naples /NIKHEF, Amsterdam /Notre Dame U. /Ohio State U. /Oregon U. /Padua U. /INFN, Padua /Paris U., VI-VII /Perugia U. /INFN, Perugia /INFN, Pisa /Princeton U. /Rome U. /INFN, Rome /Rostock U. /Rutherford /DAPNIA, Saclay /SLAC /South Carolina U. /Southern Methodist U. /Stanford U., Phys. Dept. /SUNY, Albany /Tel Aviv U. /Tennessee U. /Texas U. /Texas U., Dallas /Turin U. /INFN, Turin /Trieste U. /INFN, Trieste /Valencia U., IFIC /Victoria U. /Warwick U. /Wisconsin U., Madison

2012-06-18T23:59:59.000Z

434

Measurement of baryon production in B -meson decay  

Science Conference Proceedings (OSTI)

Using the CLEO detector at the Cornell Electron Storage Ring, we observe {ital B}-meson decays to {Lambda}{sub {ital c}}{sup +} and report on improved measurements of inclusive branching fractions and momentum spectra of other baryons. For the inclusive decay {ital {bar B}}{r arrow}{Lambda}{sub {ital c}}{sup +}{ital X} with {Lambda}{sub {ital c}}{sup +}{r arrow}{ital pK}{sup {minus}}{pi}{sup +}, we find that the product branching fraction {ital B}({ital {bar B}}{r arrow}{Lambda}{sub {ital c}}{sup +}{ital X}){ital B}({Lambda}{sub {ital c}}{sup +}{r arrow}{ital pK}{sup {minus}}{pi}{sup +})=(0.273{plus minus}0.051{plus minus} 0.039)%. Our measured inclusive branching fractions to noncharmed baryons are {ital B}({ital B}{r arrow}{ital pX})=(8.0{plus minus}0.5{plus minus}0.3)%, {ital B}({ital B}{r arrow}{Lambda}{ital X})=(3.8{plus minus}0.4{plus minus}0.6)%, and {ital B}({ital B}{r arrow}{Xi}{sup {minus}}{ital X})=(0.27{plus minus}0.05{plus minus}0.04)%. From these rates and studies of baryon-lepton and baryon-antibaryon correlations in {ital B} decays, we have estimated the branching fraction {ital B}({ital {bar B}}{r arrow}{Lambda}{sub {ital c}}{sup +}{ital X}) to be (6.4{plus minus}0.8{plus minus}0.8)%. Combining these results, we calculate {ital B}({Lambda}{sub {ital c}}{sup +}{r arrow}{ital pK}{sup {minus}}{pi}{sup +}) to be (4.3{plus minus}1.0{plus minus}0.8)%.

Crawford, G.; Fulton, R.; Jensen, T.; Johnson, D.R.; Kagan, H.; Kass, R.; Malchow, R.; Morrow, F.; Whitmore, J.; Wilson, P.; Bortoletto, D.; Brown, D.; Dominick, J.; McIlwain, R.L.; Miller, D.H.; Modesitt, M.; Ng, C.R.; Schaffner, S.F.; Shibata, E.I.; Shipsey, I.P.J.; Battle, M.; Kroha, H.; Sparks, K.; Thorndike, E.H.; Wang, C.; Alam, M.S.; Kim, I.J.; Li, W.C.; Lou, X.C.; Nemati, B.; Romero, V.; Sun, C.R.; Wang, P.; Zoeller, M.M.; Goldberg, M.; Haupt, T.; Horwitz, N.; Jain, V.; Kennett, R.; Mestayer, M.D.; Moneti, G.C.; Rozen, Y.; Rubin, P.; Skwarnicki, T.; Stone, S.; Thusalidas, M.; Yao, W.; Zhu, G.; Barnes, A.V.; Bartelt, J.; Csorna, S.E.; Letson, T.; Alexander, J.; Artuso, M.; Bebek, C.; Berkelman, K.; Besson, D.; Browder, T.; Cassel, D.G.; Cheu, E.; Coffman, D.M.; Drell, P.S.; Ehrlich, R.; Galik, R.S.; Garcia-Sciveres, M.; Geiser, B.; Gittelman, B.; Gray, S.W.; Hartill, D.L.; Heltsley, B.K.; Honscheid, K.; Kandaswamy, J.; Katayama, N.; Kreinick, D.L.; Lewis, J.D.; Ludwig, G.S.; Mas

1992-02-01T23:59:59.000Z

435

Physical Interactions between Mcm10, DNA, and DNA Polymerase [alpha  

SciTech Connect

Mcm10 is an essential eukaryotic protein required for the initiation and elongation phases of chromosomal replication. Specifically, Mcm10 is required for the association of several replication proteins, including DNA polymerase {alpha} (pol {alpha}), with chromatin. We showed previously that the internal (ID) and C-terminal (CTD) domains of Mcm10 physically interact with both single-stranded (ss) DNA and the catalytic p180 subunit of pol {alpha}. However, the mechanism by which Mcm10 interacts with pol {alpha} on and off DNA is unclear. As a first step toward understanding the structural details for these critical intermolecular interactions, x-ray crystallography and NMR spectroscopy were used to map the binary interfaces between Mcm10-ID, ssDNA, and p180. The crystal structure of an Mcm10-ID {center_dot} ssDNA complex confirmed and extended our previous evidence that ssDNA binds within the oligonucleotide/oligosaccharide binding-fold cleft of Mcm10-ID. We show using NMR chemical shift perturbation and fluorescence spectroscopy that p180 also binds to the OB-fold and that ssDNA and p180 compete for binding to this motif. In addition, we map a minimal Mcm10 binding site on p180 to a small region within the p180 N-terminal domain (residues 286-310). These findings, together with data for DNA and p180 binding to an Mcm10 construct that contains both the ID and CTD, provide the first mechanistic insight into how Mcm10 might use a handoff mechanism to load and stabilize pol {alpha} within the replication fork.

Warren, Eric M.; Huang, Hao; Fanning, Ellen; Chazin, Walter J.; Eichman, Brandt F.; (Vanderbilt)

2009-10-21T23:59:59.000Z

436

Two Photon Decays of Charmonia from Lattice QCD  

E-Print Network (OSTI)

We make the first calculation in lattice QCD of two-photon decays of mesons. Working in the charmonium sector, using the LSZ reduction to relate a photon to a sum of hadronic vector eigenstates, we compute form-factors in both the space-like and time-like domains for the transitions $\\eta_c \\to \\gamma^* \\gamma^*$ and $\\chi_{c0} \\to \\gamma^* \\gamma^*$. At the on-shell point we find approximate agreement with experimental world-average values.

Jozef J. Dudek; Robert G. Edwards

2006-07-12T23:59:59.000Z

437

Indoor radon and decay products: Concentrations, causes, and control strategies  

SciTech Connect

This report is another in the on going technical report series that addresses various aspects of the DOE Radon Research Program. It provides an overview of what is known about the behavior of radon and its decay products in the indoor environment and examines the manner in which several important classes of factors -- structural, geological, and meteorological -- affect indoor radon concentrations. Information on US indoor radon concentrations, currently available monitoring methods and novel radon control strategies are also explored. 238 refs., 22 figs., 9 tabs.

Nero, A.V.; Gadgil, A.J.; Nazaroff, W.W.; Revzan, K.L.

1990-11-01T23:59:59.000Z

438

Search for the Rare Leptonic Decays B^+ \\to l^+ \  

SciTech Connect

We have performed a search for the rare leptonic decays B{sup +} {yields} {ell}{sup +} {nu}{sub {ell}}({ell} = e,{mu}), using data collected at the ?(4S) resonance by the BABAR detector at the PEP-II storage ring. In a sample of 468 x 10{sup 6} B{bar B} pairs we find no evidence for a signal and set an upper limit on the branching fractions B(B{sup +} {yields} e{sup +}{nu}{sub e}) < 1.9 x 10{sup -6} at the 90% confidence level, using a Bayesian approach.

Aubert, B.; Karyotakis, Y.; Lees, J.P.; Poireau, V.; Prencipe, E.; Prudent, X.; Tisserand, V.; /Annecy, LAPP; Garra Tico, J.; Grauges, E.; /Barcelona U., ECM; Martinelli, M.; Palano, A.; Pappagallo, M.; /INFN, Bari /Bari U.; Eigen, G.; Stugu, B.; Sun, L.; /Bergen U.; Battaglia, M.; Brown, D.N.; Kerth, L.T.; Kolomensky, Yu.G.; Lynch, G.; Osipenkov, I.L.; /LBL, Berkeley /UC, Berkeley /Birmingham U. /Ruhr U., Bochum /British Columbia U. /Brunel U. /Novosibirsk, IYF /UC, Irvine /UCLA /UC, Riverside /UC, San Diego /UC, Santa Barbara /UC, Santa Cruz /Caltech /Cincinnati U. /Colorado U. /Colorado State U. /Dortmund U. /Dresden, Tech. U. /Ecole Polytechnique /Edinburgh U. /INFN, Ferrara /Ferrara U. /INFN, Ferrara /INFN, Ferrara /Ferrara U. /INFN, Ferrara /INFN, Ferrara /Ferrara U. /Frascati /INFN, Genoa /Genoa U. /INFN, Genoa /INFN, Genoa /Genoa U. /INFN, Genoa /Genoa U. /INFN, Genoa /INFN, Genoa /Genoa U. /INFN, Genoa /INFN, Genoa /Genoa U. /Harvard U. /Heidelberg U. /Humboldt U., Berlin /Imperial Coll., London /Iowa U. /Iowa State U. /Johns Hopkins U. /Orsay, LAL /LLNL, Livermore /Liverpool U. /Queen Mary, U. of London /Royal Holloway, U. of London /Louisville U. /Mainz U., Inst. Kernphys. /Manchester U. /Maryland U. /Massachusetts U., Amherst /MIT, LNS /McGill U. /INFN, Milan /Milan U. /INFN, Milan /INFN, Milan /Milan U. /Mississippi U. /Montreal U. /Mt. Holyoke Coll. /INFN, Naples /Naples U. /INFN, Naples /INFN, Naples /Naples U. /NIKHEF, Amsterdam /Notre Dame U. /Ohio State U. /Oregon U. /INFN, Padua /Padua U. /INFN, Padua /INFN, Padua /Padua U. /Paris U., VI-VII /Pennsylvania U. /INFN, Perugia /Perugia U. /INFN, Pisa /Pisa U. /INFN, Pisa /Pisa, Scuola Normale Superiore /INFN, Pisa /Pisa U. /INFN, Pisa /Princeton U. /INFN, Rome /INFN, Rome /Rome U. /INFN, Rome /INFN, Rome /Rome U. /INFN, Rome /INFN, Rome /Rome U. /INFN, Rome /INFN, Rome /Rome U. /INFN, Rome /Rostock U. /Rutherford /DSM, DAPNIA, Saclay /SLAC /South Carolina U. /Stanford U., Phys. Dept. /SUNY, Albany /Tennessee U. /Texas U. /Texas U., Dallas /INFN, Turin /Turin U. /INFN, Trieste /Trieste U. /Valencia U., IFIC /Victoria U. /Warwick U. /Wisconsin U., Madison

2009-06-19T23:59:59.000Z

439

Measurement of $\\psi(2S)$ decays to baryon pairs  

E-Print Network (OSTI)

A sample of 3.95M $\\psi(2S)$ decays registered in the BES detector are used to study final states containing pairs of octet and decuplet baryons. We report branching fractions for $\\psi(2S)\\to p\\bar{p}$, $\\Lambda\\bar{\\Lambda}$, $\\Sigma^0\\bar{\\Sigma}{}^0$, $\\Xi^-\\bar{\\Xi}{}^+$, $\\Delta^{++}\\bar{\\Delta}{}^{--}$, $\\Sigma^+(1385)\\bar{\\Sigma}{}^-(1385 )$, $\\Xi^0(1530)\\bar{\\Xi}{}^0(1530)$, and $\\Omega^-\\bar{\\Omega}{}^+$. These results are compared to expectations based on the SU(3)-flavor symmetry, factorization, and perturbative QCD.

Bai, J Z; Bian, J G; Blum, I K; Chen, A D; Chen, G P; Chen, H F; Chen, H S; Chen, J; Chen Jia Chao; Chen, X D; Chen, Y; Chen, Y B; Cheng Bao Sen; Choi, J B; Cui, X Z; Ding, H L; Dong, L Y; Du, Z Z; Dunwoodie, W M; Gao, C S; Gao, M L; Gao, S Q; Gratton, P; Gu, J H; Gu, S D; Gu, W X; Guo, Y N; Guo, Z J; Han, S W; Han, Y; Harris, F A; He, J; He, J T; He, K L; He, M; Heng, Y K; Hitlin, D G; Hu, G Y; Hu, H M; Hu, J L; Hu, Q H; Hu, T; Huang, G S; Huang, X P; Huang, Y Z; Izen, J M; Jiang, C H; Jin, Y; Jones, B D; Ju, X; Kang, J S; Ke, Z J; Kelsey, M H; Kim, B K; Kim, H J; Kim, S K; Kim, T Y; Kong, D; Lai, Y F; Lang, P F; Lankford, A J; Li, C G; Li, D; Li, H B; Li, J; Li, J C; Li, P Q; Li, W; Li, W G; Li, X H; Li Xiao Nan; Li Xue Qian; Li Zhong Chao; Liu, B; Liu, F; Liu Feng; Liu, H M; Liu, J; Liu, J P; Liu, R G; Liu, Y; Liu, Z X; Lou, X C; Lowery, B; Lu, G R; Lu, F; Lu, J G; Luo, X L; Ma, E C; Ma, J M; Malchow, R L; Mao, H S; Mao, Z P; Meng, X C; Mo, X H; Nie, J; Olsen, S L; Oyang, J Y T; Paluselli, D; Pan, L J; Panetta, J; Park, H; Porter, F; Qi, N D; Qi, X R; Qian, C D; Qiu, J F; Qu, Y H; Que, Y K; Rong, G; Schernau, M; Shao, Y Y; Shen, B W; Shen, D L; Shen, H; Shen, H Y; Shen, X Y; Shi, F; Shi, H Z; Song, X F; Standifird, J; Suh, J Y; Sun, H S; Sun, L F; Sun, Y Z; Tang, S Q; Toki, W; Tong, G L; Varner, G S; Wang, F; Wang, L; Wang, L S; Wang, L Z; Wang, P; Wang, P L; Wang, S M; Wang, Y Y; Wang, Z Y; Weaver, M; Wei, C L; Wu, N; Wu, Y G; Xi, D M; Xia, X M; Xie, Y; Xie, Y H; Xu, G F; Xue, S T; Yan, J; Yan, W G; Yang, C M; Yang, C Y; Yang, H X; Yang, W; Yang, X F; Ye, M H; Ye Shu Wei; Ye, Y X; Yu, C S; Yu, C X; Yu, G W; Yu Yu Hei; Yu, Z Q; Yuan, C Z; Yuan, Y; Zhang Bing Yun; Zhang, C; Zhang, C C; Zhang, D H; De Hong Zhang; Zhang, H L; Zhang, J; Zhang, J W; Zhang, L; Zhang Lei; Zhang, L S; Zhang, P; Zhang, Q J; Zhang, S Q; Zhang, X Y; Zhang, Y Y; Zhao, D X; Zhao, H W; Jia Wei Zhao; Zhao Jia Wei; Zhao, M; Zhao Wei Ren; Zhao, Z G; Zheng Jian Ping; Zheng Lin Sheng; Zheng Zhi Peng; Zhou, B Q; Zhou, L; Zhu, K J; Zhu, Q M; Zhu, Y C; Zhu, Y S; Zhu, Z A; Zhuang, B A

2001-01-01T23:59:59.000Z

440

Distinguishing Spins in Decay Chains at the Large Hadron Collider.  

E-Print Network (OSTI)

ar X iv :h ep -p h/ 06 05 28 6v 4 2 9 A ug 2 00 8 Preprint typeset in JHEP style - PAPER VERSION CavendishHEP06/11(rev.) Distinguishing Spins in Decay Chains at the Large Hadron Collider? Christiana Athanasiou1, Christopher G. Lester2... particles at the LHC, Phys. Lett. B596 (2004) 205212, hep-ph/0405052. [2] T. Goto, K. Kawagoe, and M. M. Nojiri, Study of the slepton non-universality at the CERN Large Hadron Collider, Phys. Rev. D70 (2004) 075016, hep-ph/0406317. 21 [3] H. C. Cheng...

Athanasiou, Christiana; Lester, Christopher G; Smillie, Jennifer M; Webber, Bryan R

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441

Distinguishing Spins in Decay Chains at the Large Hadron Collider  

E-Print Network (OSTI)

ar X iv :h ep -p h/ 06 05 28 6v 4 2 9 A ug 2 00 8 Preprint typeset in JHEP style - PAPER VERSION CavendishHEP06/11(rev.) Distinguishing Spins in Decay Chains at the Large Hadron Collider? Christiana Athanasiou1, Christopher G. Lester2... particles at the LHC, Phys. Lett. B596 (2004) 205212, hep-ph/0405052. [2] T. Goto, K. Kawagoe, and M. M. Nojiri, Study of the slepton non-universality at the CERN Large Hadron Collider, Phys. Rev. D70 (2004) 075016, hep-ph/0406317. 21 [3] H. C. Cheng...

Athanasiou, Christiana; Lester, Christopher G; Smillie, Jennifer M; Webber, Bryan R

442

Cosmological Bounds on an Invisibly Decaying Higgs Boson  

E-Print Network (OSTI)

We derive bounds on the Higgs boson coupling $g^{\\prime}$ to a stable light scalar which is regarded as a collisional dark matter candidate. We study the behaviour of this scalar, that we refer to as phion ($\\phi$), in the early Universe for different ranges of its mass. We find that a phion in the mass range of $100 \\mev$ is excluded, while if its mass is about $1 \\gev$, a rather large coupling constant, $g^{\\prime} \\gsim 2$, and $m_h \\lsim 130 \\gev$ are required in order to avoid overabundance. In the latter case, the invisible decay mode of the Higgs boson is dominant.

O. Bertolami; M. C. Bento; R. Rosenfeld

2001-11-21T23:59:59.000Z

443

Precision Measurement of the Neutron Beta-Decay Asymmetry  

E-Print Network (OSTI)

A new measurement of the neutron $\\beta$-decay asymmetry $A_0$ has been carried out by the UCNA collaboration using polarized ultracold neutrons (UCN) from the solid deuterium UCN source at the Los Alamos Neutron Science Center (LANSCE). Improvements in the experiment have led to reductions in both statistical and systematic uncertainties leading to $A_0 = -0.11954(55)_{\\rm stat.}(98)_{\\rm syst.}$, corresponding to the ratio of axial-vector to vector coupling $\\lambda \\equiv g_A/g_V = -1.2756(30)$.

Mendenhall, M P; Bagdasarova, Y; Berg