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1

Collisional and radiative excitation transfers in Kr-Xe mixtures: Quenching of Kr  

Science Journals Connector (OSTI)

A detailed study of electronic energy transfers in Kr-Xe mixtures has been made using a 250-keV electron accelerator to excite Kr-Xe mixtures over a wide range of Kr-host-gas pressure and Xe-impurity concentrations. Kr pressure ranged from 25 to 900 Torr with Xe concentrations varying from 0.1% to 10% of Kr partial pressure. Emission spectra taken in the vacuum-ultraviolet (vuv) region indicate that energy is transferred efficiently from Kr to Xe, with radiation from the Xe(3P1) state becoming greatly enhanced as the Xe-impurity concentration is increased. Emission spectra from the vuv also show that the Xe(1P1) state is populated by absorption of photons emitted from the Kr2 * first continuum. Two-body quenching rates with Xe ground-state atoms have been found for the Kr(1P1) [kq(1165 Å)=1.2×105 sec-1/Torr] and for the Kr(3P1) [kq(1236 Å)=9.5×105 sec-1/Torr] resonance states. Time-resolved measurements have also been made on the Kr2 * first and second continua. These measurements show the Kr(3P1) state is the atomic precursor of the Kr2 * first continuum. The results obtained in the Kr2 * second continuum are rate limited by the decay of Kr(3P1) at large Xe-impurity concentrations.

Jerry D. Cook and P. K. Leichner

1985-01-01T23:59:59.000Z

2

Metal-organic frameworks for Xe/Kr separation  

DOE Patents (OSTI)

Metal-organic framework (MOF) materials are provided and are selectively adsorbent to xenon (Xe) over another noble gas such as krypton (Kr) and/or argon (Ar) as a result of having framework voids (pores) sized to this end. MOF materials having pores that are capable of accommodating a Xe atom but have a small enough pore size to receive no more than one Xe atom are desired to preferentially adsorb Xe over Kr in a multi-component (Xe--Kr mixture) adsorption method. The MOF material has 20% or more, preferably 40% or more, of the total pore volume in a pore size range of 0.45-0.75 nm which can selectively adsorb Xe over Kr in a multi-component Xe--Kr mixture over a pressure range of 0.01 to 1.0 MPa.

Ryan, Patrick J.; Farha, Omar K.; Broadbelt, Linda J.; Snurr, Randall Q.; Bae, Youn-Sang

2013-08-27T23:59:59.000Z

3

Metal-organic frameworks for Xe/Kr separation  

DOE Patents (OSTI)

Metal-organic framework (MOF) materials are provided and are selectively adsorbent to xenon (Xe) over another noble gas such as krypton (Kr) and/or argon (Ar) as a result of having framework voids (pores) sized to this end. MOF materials having pores that are capable of accommodating a Xe atom but have a small enough pore size to receive no more than one Xe atom are desired to preferentially adsorb Xe over Kr in a multi-component (Xe--Kr mixture) adsorption method. The MOF material has 20% or more, preferably 40% or more, of the total pore volume in a pore size range of 0.45-0.75 nm which can selectively adsorb Xe over Kr in a multi-component Xe--Kr mixture over a pressure range of 0.01 to 1.0 MPa.

Ryan, Patrick J.; Farha, Omar K.; Broadbelt, Linda J.; Snurr, Randall Q.; Bae, Youn-Sang

2014-07-22T23:59:59.000Z

4

Inversion kinetics for Kr-Xe bilayers on palladium  

Science Journals Connector (OSTI)

The thermally activated inversion of Kr-Xe bilayers on Pd is studied with the use of photoemission and photon-excited Auger spectroscopy. Bilayers formed by the deposit of a monolayer or less of Xe on top of a monolayer of Kr on Pd at 49 K are shown to invert when the temperature is raised, with Xe coming in direct contact with the substrate. For a Pd(111) substrate the activation energy of this inversion process is determined: Ea=0.12±0.03 eV.

G. Kaindl; T.-C. Chiang; D. E. Eastman

1982-06-15T23:59:59.000Z

5

Photoemission from Ar, Kr, and Xe on Pb(111)  

Science Journals Connector (OSTI)

Angle-resolved photoelectron spectra were measured for the valence p states of Ar, Kr, and Xe on Pb(111). The thickness of the rare-gas layers was varied between 0.05 and about 5 monolayers. For each layer the work function was deduced from the width of the photoelectron energy-distribution curve. On Pb(111) tightly packed monolayers were prepared, exhibiting energy dispersion of the valence p states, which is discussed in the framework of the known two-dimensional band structure. The spectral features are very sharp, as can be seen from the full width at half maximum value of 175 meV for the Xe 5p1/2 peak. For Xe the submonolayer regime was also studied, where single atoms are adsorbed together with small three-dimensional clusters. The single atoms exhibit no dispersion and no split of the p3/2 level into two sublevels. This demonstrates that these features are derived from lateral interaction in the rare-gas monolayer. On top of the monolayer a second completely filled layer can be prepared for Ar, Kr, and Xe. The second-layer shift in binding energy is 720 meV for Ar and Kr and 525 meV for Xe. It is about 6 times as large as the work-function changes induced by the monolayer. This observation can only be explained in the known final-state interpretation of the layer-dependent shifts in binding energy.

K. Jacobi

1988-09-15T23:59:59.000Z

6

Sublimation Pressures of Solid Ar, Kr, and Xe  

Science Journals Connector (OSTI)

Results of an experiment to measure the sublimation pressures of Ar, Kr, and Xe over wide temperature and pressure ranges are presented. Data are reported from near the respective triple points to about (2.3 × 10-6 Torr, 25.506 K) for Ar; (2.1 × 10-4 Torr, 45.130 K) for Kr; (3.8 × 10-4 Torr, 70.075 K) for Xe. Pressures were measured with a Hg manometer, a McLeod gauge, and a calibrated Bourdon gauge. The data have been corrected for thermomolecular flow and streaming. Temperatures were measured with a N.B.S.-calibrated Pt resistance thermometer. The application of the law of corresponding states is investigated. Values for static lattice energy, geometric mean of the lattice vibrational spectrum, heat of sublimation, and lattice vibrational energy are calculated using theoretical sublimation pressure curves.

Charles W. Leming and Gerald L. Pollack

1970-10-15T23:59:59.000Z

7

Positronium scattering from Kr and Xe at low energies  

Science Journals Connector (OSTI)

The scattering of orthopositronium from Kr and Xe is investigated with the fixed core stochastic variational method. The scattering lengths for Ps-Kr and Ps-Xe scattering in the fixed core approximation are 3.18a0 and 3.82a0, respectively. Inclusion of core-polarization potentials leads to a significant reduction in the scattering lengths. The Ps-Kr and Ps-Xe scattering lengths were 1.98a0 and 2.29a0 for polarization potentials that were tuned to an average of the model electron-atom and positron-atom scattering lengths for the respective atoms. Other choices of the polarization potential resulted in scattering lengths that could be larger by 0.3a0 or smaller by 0.8a0. The pick-off annihilation parameter 1Zeff has also been computed as part of the analysis. The present values of 1Zeff are about 3 to 10 times smaller than the accepted experimental values since short-range electron-positron correlations were ignored when the annihilation matrix element was evaluated.

J. Mitroy and M. W. J. Bromley

2003-03-17T23:59:59.000Z

8

Metastable-atom desorption and luminescence stimulated by low-energy electron impact on condensed Kr, Xe, and Xe/Kr films  

Science Journals Connector (OSTI)

Metastable-atom desorption and uv luminescence from thin films of Kr and Xe on Pt(111) stimulated by impact of monochromatic low-energy electrons (E=5–25 eV, ?E=60 meV) have been studied. For either pure rare-gas film, the excitation function of the total luminescence signal shows two broad peaks that are presumably related to the interplay between creation of excitons and free-electron–hole pairs. Metastable-particle desorption is very weak for pure Kr and not detectable for pure Xe over the entire range of electron energies. However, for 35-ML Kr films covered with 1-ML Xe (ML denotes monolayer), a considerable signal due to metastable-particle desorption is observed. The energy dependence of the signal in the 8–12.6-eV region leads to an interpretation of the desorption in the form of two different mechanisms with different thresholds. The first one is based on the creation of a Xe exciton in a Kr environment, while in the second scheme the excitation energy is transferred from a Kr bulk exciton to a Xe atom at the Kr-Xe interface. In both cases, repulsive Kr-Xe* interaction near the film surface is postulated to eject a metastable Xe* atom.

A. Mann; G. Leclerc; L. Sanche

1992-10-15T23:59:59.000Z

9

Charge Transport in Solid and Liquid Ar, Kr, and Xe  

Science Journals Connector (OSTI)

This paper reports an investigation of the drift velocity of excess electrons in solid and liquid Ar, Kr, and Xe. After purification of the commercially available gas, thin crystal specimens (100-600 ?m) were grown from the liquid between parallel electrodes in a chamber attached to a miniature cryostat. Pulses of 40-keV electrons were used to generate the charge carriers in both liquids and solids. This technique overcomes the limitations inherent in previously applied methods and has made it possible to investigate the drift velocity over a range of applied fields from 10 V cm-1 to 100 kV cm-1. Near the triple point, the low-field mobility ?0 in solid Ar, Kr, and Xe was found to be 1000, 3700, and about 4500 cm2sec-1V-1, respectively. In the liquids the corresponding mobilities were 475, 1800, and 2200 cm2sec-1V-1. The temerature dependence of ?0 has been measured on Ar crystals, and the results indicate that ?0 is determined by acoustic scattering. The electron lifetime appears to be controlled predominantly by oxygen impurities. Pronounced hot-electron effects are observed in drift-velocity—versus—field curves for both liquids and solids, and their fit to the Shockley hot-electron theory has been investigated. In the high-field region all the curves show an almost complete saturation with field. The theory of Cohen and Lekner applied to liquid Ar fits the results over most of the field range, suggesting that the deviations from the Shockley theory at higher electron temperatures are associated with an increase in the value of the structure factor. In solid Ar or Kr, positive holes do not appear to be mobile, but in Xe crystals a hole mobility of about 2×10-2 cm2sec-1V-1 was found. The implications of these results are briefly discussed.

L. S. Miller; S. Howe; W. E. Spear

1968-02-15T23:59:59.000Z

10

Comments on reported discrepancies between optical data and Auger results for Xe and Kr  

Science Journals Connector (OSTI)

A new analysis of the Xe II spectrum is used to explain a number of reported discrepancies between optical data and results of Auger measurements. Some discrepancies for Kr are also resolved.

Jørgen E. Hansen and Willy Persson

1979-07-01T23:59:59.000Z

11

Commensurate-incommensurate transition of Kr-Xe mixtures on graphite  

Science Journals Connector (OSTI)

We report high-resolution x-ray scattering measurements of the commensurate-incommensurate transition of Kr on graphite which has been preplated with 0.1 monolayer of Xe. The Xe raises transition pressure, and produces a 31% range of pressures over which composite lineshapes are observed. These results are discussed in terms of a solubility gap between commensurate and incommensurate phases.

Peter W. Stephens; Alan I. Goldman; Paul A. Heiney; Peter A. Bancel

1986-01-01T23:59:59.000Z

12

Multiple ionization of Ar, Kr, and Xe in a superstrong laser field  

Science Journals Connector (OSTI)

We report the numerical calculation of Ar9+? Ar13+, Kr13+? Kr17+, and Xe19+? Xe23+ ion yield in the laser field with intensity exceeding 1019 W/cm2. The results of the calculations agree with the experimental data [K. Yamakava et al., Phys. Rev. A 68, 065403 (2003)] quantitatively (for the Ar ions) or qualitatively (for the Kr ions). The theoretical results disagree with the experimental data for the Xe ions. We discuss the possible influence of the relativistic effects on this disagreement between theory and experiment. We obtained the approximation formula for the position of the maximum ionic population with the given ionization multiplicity Z depending on the radiation intensity. This position is described by the power function of Z; the exponent is determined by the dependence of sequential ionization potentials on Z value. We discuss the dependence of the approximation formula parameters on the value of the FWHM of the laser pulse.

Aleksei S. Kornev; Elena B. Tulenko; Boris A. Zon

2011-11-21T23:59:59.000Z

13

Adsorption of Kr, Xe, and Ar on highly uniform MgO smoke  

Science Journals Connector (OSTI)

The first atomic layer of Kr, Xe, and Ar adsorbed on MgO smoke is explored by using adsorption isotherms. A procedure has been developed by which we produce MgO smoke powders of higher homogeneity than previously reported. On these powders, apparent two-dimensional (2D) solid-vapor, fluid-vapor, and solid-fluid coexistence regions are observed for Kr and Xe. Triple-point temperatures are estimated to be 66.6±0.5 K and 100.8±1.0 K, and the critical temperatures are estimated to be 86.8±1.0 K and 119±2.0 K, respectively, for these two elements. A comparison between Kr and Xe 2D-solid densities at the fluid-solid transition suggests that the 2D-solid phases are incommensurate with the substrate. The Ar isotherms are qualitatively different from those of Kr and Xe, showing no features corresponding to 2D phase transitions in the P-T range studied. A qualitative estimate places the Ar 2D critical temperature at about 65 K.

Jean-Paul Coulomb; Timothy S. Sullivan; Oscar E. Vilches

1984-10-15T23:59:59.000Z

14

Initial proof-of-principle for near room temperature Xe and Kr separation from air with MOFs  

SciTech Connect

Materials were developed and tested in support of the U.S. Department of Energy, Office of Nuclear Energy, Fuel Cycle Technology Separations and Waste Forms Campaign. Specifically, materials are being developed for the removal of Xenon and krypton from gaseous products of nuclear fuel reprocessing unit operations. During FY 2012, Three Metal organic framework (MOF) structures were investigated in greater detail for the removal and storage of Xe and Kr from air at room temperature. Our breakthrough measurements on Nickel based MOF could capture and separate parts per million levels of Xe from Air (40 ppm Kr, 78% N2, 21% O2, 0.9% Ar, 0.03% CO2). Similarly, the selectivity can be changed from Xe > Kr to Xe < Kr simply by changing the temperature in another MOF. Also for the first time we estimated the cost of the metal organic frameworks in bulk.

Thallapally, Praveen K.; Strachan, Denis M.

2012-06-06T23:59:59.000Z

15

Photoattenuation in the extreme red wings of Xe and Kr resonant lines  

Science Journals Connector (OSTI)

Photoattenuation coefficients are reported for high-pressure xenon and krypton at wavelengths in the red wings of the first resonant lines [Xe(P13), ?0=1470 Å and Kr(P13), ?0=1236 Å]. The measurements cover the range 2000-20 000 cm-1 from the resonant lines. The photoattenuation spectra are interpreted in terms of Rayleigh scattering and photoabsorption by atoms, Van der Waals molecules, and unbound diatomic molecules—different portions of the spectra are dominated by different species and phenomena. Absorption by unbound diatomic molecules is interpreted via a quasistatic model of the molecule. Analysis of the data in this manner yields information concerning the structure and radiative lifetime of the lowest-bound diatomic states of Xe2* and Kr2*. The significance of the results reported here in regards to dissociative noble-gas lasers (transition from a bound diatomic level to the repulsive ground level) is discussed.

J. B. Gerardo and A. Wayne Johnson

1974-10-01T23:59:59.000Z

16

Velocity-dependent total scattering cross sections for metastable helium on Kr and Xe  

Science Journals Connector (OSTI)

Single-beam attenuation measurements of velocity-dependent total scattering cross sections for the interactions of metastable helium (He*) on Kr and Xe targets have been measured in the 1-5-km/s relative-velocity range. The results are compared with cross sections obtained by full quantum calculations for a Lennard-Jones (12-6) potential with the parameters ? and ? adjusted for a best fit. The results (in atomic units) are ?=3.38×10-4 a.u., ?=7.80 a.u., for the He*+Kr system and ?=5.34×10-4 a.u. and ?=7.79 a.u. for the He*+Xe system.

K. A. Hardy and J. W. Sheldon

1984-11-01T23:59:59.000Z

17

Soft-x-ray-emission spectra of solid Kr and Xe  

Science Journals Connector (OSTI)

We present the first soft x-ray-emission spectra for solid Kr (4p-3d) and Xe (5p-4d) that are free of complicating satellite spectra. Monochromatic synchrotron-radiation excitation is used to suppress the satellites. The data are analyzed to determine the P3/2 bandwidth for both elements; these results are compared with both photoemission data and available theoretical calculations. Bandwidths are found to be larger than those predicted by most electronic structure calculations.

J. J. Jia; W. L. O’Brien; T. A. Callcott; Q. Y. Dong; J-E. Rubensson; D. R. Mueller; D. L. Ederer

1991-08-05T23:59:59.000Z

18

Differential measurements of ionization and inelastic energy losses in 0.25—3.0-MeV collisions of Kr ions with Kr and Xe targets  

Science Journals Connector (OSTI)

The final charge states of the scattered ions and the inelastic energy losses have been measured for single collisions of 0.25—3.0-MeV Kr ions with Kr and Xe targets. The charge states of the scattered ions were measured as functions of scattering angle (from 0.8° to 45°) ion energies from 0.25 to 3.0 MeV. The total inelastic energy losses were measured using the scattered- and recoil-particle coincidence technique for 0.4-, 0.6-, and 1.0-MeV Kr+-Kr collision energies and from 0.4 to 1.4 MeV for the Kr+-Xe combination. The results show the impact-parameter dependence of several inner-shell excitations and confirm the quasimolecular nature of heavy-ion—atom collisions within the framework of the Fano-Lichten model. For the Kr-Kr case, excitations are observed for values of the distance of closest approach, R0, of 0.40, 0.30, and 0.20 Å; and for the Kr-Xe case, excitations are observed at R0 values of 0.28, 0.18, and 0.09 Å. The data show agreement with the molecular-potential calculations of Eichler and co-workers.

Ali A. Antar and Quentin C. Kessel

1984-03-01T23:59:59.000Z

19

Kinetically tailored properties of electron-beam excited XeF(C. -->. A) and XeF(B. -->. X) laser media using an Ar-Kr buffer mixture  

SciTech Connect

Use of a two-component buffer gas comprised of Ar and Kr results in electron-beam excited XeF(C..-->..A) laser pulse energy and intrinsic efficiency values comparable to those of UV rare gas-halide lasers. Herein the authors report measurements of transient absorption confirming that the primary effect of a buffer comprised of Ar and Kr is a significantly lower level of ionized and excited species that absorb in the blue-green spectral region. Spectral analysis of a variety of mixtures show that the Ar-Kr buffer also benefits XeF(C..-->..A) laser performance due to an increase in gain in the 400-450 nm region caused by the presence of the Kr/sub 2/F excimer. In addition, a large increase in absorption at --351 nm, also due to Kr/sub 2/F, suppresses oscillation on the competitive XeF(B..-->..X) transition and, for certain conditions, makes efficient simultaneous oscillation of the XeF(B..-->..X) and XeF(C..-->..A) laser transitions possible.

Nighan, W.L.; Sauerbrey, R.A.; Zhu, Y.; Tittel, F.K.; Wilson, W.L. Jr.

1987-02-01T23:59:59.000Z

20

Measurement of the Atomic Scattering Factor of Ne, Ar, Kr, and Xe  

Science Journals Connector (OSTI)

To test the accuracy of the Hartree-Fock (HF) method and the reliability of x-ray measurements of the atomic scattering factor f, we have determined the scattering of Mo K? radiation by Ne, Ar, Kr, and Xe gases. Values of f were obtained on an absolute basis with an accuracy of about ¼%. Results at small angle yield the mean-square radius of the electron cloud ?r2?av and the dispersion correction. For Ne, Ar, and Kr, the values of ?r2?av are in good agreement with HF calculations. For Xe, the experimental value is significantly lower. Susceptibility results yield about 6% lower values in each case. Our derived values of the dispersion correction are each more negative than those obtained from published absorption coefficients. At higher angles, our f values differ by less than 0.2 electron unit from the HF values for all the gases; even for Xe the approximate HF values presently available are more nearly accurate than the Thomas-Fermi-Dirac (TFD) values. We conclude that a 4% discrepancy between theory and experiment found by Batterman, Chipman, and DeMarco for metal powders arose from solid-state effects or from difficulties in sample preparation.

D. R. Chipman and L. D. Jennings

1963-10-15T23:59:59.000Z

Note: This page contains sample records for the topic "uus kr xe" 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

Elastic Constants of Solid Ar, Kr, and Xe: A Monte Carlo Study  

Science Journals Connector (OSTI)

The elastic constants of classical systems of 108 particles arranged (with periodic boundary conditions) on an fcc lattice and interacting with pairwise-additive forces have been evaluated to an accuracy of about 2% by a Monte Carlo procedure closely related to that used by Hoover and his co-workers. For Ar(80 °K) and Kr(85 and 115 °K) we have used the Bobetic-Barker pair potentials and also included the corrections for the truncated tail of the pair potential, quantum effects, and three-body forces. For Ar(80 °K) and Xe(156 °K) we have carried out a similar calculation for the familiar Lennard-Jones 6:12 potential. Our 6:12 Ar(80 °K) elastic constants agree well with the previous work of Hoover et al. but unfortunately differ only little from the more realistic Bobetic-Barker Ar(80 °K) values. Bulk moduli for both potentials are compatible with the currently available experimental data. Comparison of our Kr results with experimental data indicates a need for refinement of the Bobetic-Barker Kr potential. The Xe(156 °K) results agree very well with the recent Brillouin-scattering work of Gornall and Stoicheff which is to some extent disappointing because the same 6:12 potential is in poor agreement with the low-temperature heat capacity.

M. L. Klein and R. D. Murphy

1972-09-15T23:59:59.000Z

22

Balmer-line emission from low-energy H impact on Kr and Xe  

Science Journals Connector (OSTI)

Absolute cross sections for the emission of Balmer-? and Balmer-? radiation have been measured for H+Kr and H+Xe collisions. Measurements were made for H-atom energies from 2.5 to 0.04 keV. The polarizations of the emitted radiations were also determined and, for H-atom energies above 0.2 keV, the contributions to these emissions from decay of the long-lived 3s and 4s excited states of hydrogen were resolved. The results are discussed in comparison with similar data for H-atom impact on the other rare-gas atoms.

B. Van Zyl; H. Neumann; M. W. Gealy

1986-03-01T23:59:59.000Z

23

Hole transport in the rare-gas solids Ne, Ar, Kr, and Xe  

Science Journals Connector (OSTI)

This paper reports an investigation of the drift mobility of excess holes in solid Ne, Ar, Kr, and Xe. Thin-crystal specimens (50-500 ?m thick) were grown from the liquid between parallel-plate electrodes in a chamber attached to a miniature cryostat after purification of the starting gas. As in previous work on the electron transport in rare-gas solids and liquids, an electron-beam technique was used to generate excess carriers near one of the electrodes. Holes were extracted by the applied field and their transit time was measured directly, leading to the drift mobility ?h. Close to the triple points, ?h values in the above crystals lie between 1 × 10-2 and 4 × 10-2 cm2 V-1 sec-1, several orders of magnitude lower than the corresponding electron mobilities. The form of the temperature dependence of ?h changes progressively from Xe (?h?T-1.6) to an essentially activated mobility in Ar and Ne. The experimental results have been analyzed in terms of small-polaron theory, using both the adiabatic and nonadiabatic approximations. The theory can account for the different forms of the temperature dependence and possible ranges of values for the predominant phonon energy, the polaron binding energy and the transfer energy for holes have been deduced in each case. These quantities, characterizing the hole hopping transport, vary systematically from Xe to Ne and their correlation is discussed in some detail.

P. G. Le Comber; R. J. Loveland; W. E. Spear

1975-04-15T23:59:59.000Z

24

Ionization of the He, Ne, Ar, Kr, and Xe isoelectronic series by proton impact  

Science Journals Connector (OSTI)

In this paper we report ionization cross sections of positive Li+, Na+, K+, Rb+, neutral He, Ne, Ar, Kr, Xe, and negative F?, Cl?, Br?, I? ions by impact of protons with energies ranging from 25to1000keV. Cross sections of singly charged ions are relevant to the calculation of electron yields in collisions with insulator surfaces. Calculations were performed within the continuum distorted wave–eikonal initial state method using an angular expansion in spherical harmonics and a numerical evaluation of the radial functions corresponding to both the initial (bound) and the final (continuum) states. The first Born approximation was used on an equal footing. We find that this first-order theory holds for proton energies larger than 300keV. For comparison, we also calculate the shellwise local plasma approximation. Our results show that it gives a good account of the cross sections for neutral targets.

J. E. Miraglia and M. S. Gravielle

2008-11-06T23:59:59.000Z

25

Laser-induced quadrupole-quadrupole collisional energy transfer in Xe-Kr systems  

Science Journals Connector (OSTI)

Experimental investigation of laser-induced quadrupole-quadrupole collisional energy transfer between Xe and Kr is reported in this paper. The excitation spectrum of laser-induced collisional energy transfer (LICET) is characterized by a slowly decreasing tail on the blue side of the peak and a width of ?30 cm?1. The experimental evidence shows that in the quasistatic wing the quadrupole-quadrupole LICET spectrum follows a power law that is different from the dipole-dipole LICET line shape and the profile of the quadrupole-quadrupole LICET decreases more slowly than the dipole-dipole LICET profile. The results indicate that the laser-induced quadrupole-quadrupole collision can be considered as a practical process to transfer energy selectively from a storage state making a parity-nonallowed transition to a target state making a parity-allowed transition.

Zhenzhong Lu (???); Deying Chen (???); Rongwei Fan (???); Yuanqin Xia (???)

2012-06-01T23:59:59.000Z

26

Angular distribution of ejected electrons in resonant Auger processes of Ar, Kr, and Xe  

Science Journals Connector (OSTI)

Angle-resolved electron spectroscopy with the help of synchrotron radiation has been used to study resonant Auger processes near the core shells of Ar 2p, Kr 3d, and Xe 4d. Results for the lowest-energy resonances have received special attention: argon (Ar 2p3/2?4s) at a photon energy of 244.4 eV, krypton (Kr 3d5/2?5p) at 91.2 eV, and xenon (Xe 4d5/2?6p) at 65.1 eV. The angular distribution parameters ? are evaluated for each of the resolved Auger peaks. Most striking is the occurrence of large negative ? values for some of the higher kinetic energy peaks. The results are most apparent under high electron resolution. The theoretical basis for having ? values near -1 is discussed. In particular, the experimental results for argon are found to be in general agreement with the prediction of -1 ? values by using either angular momentum transfer theory or normal Auger theory. However, a better understanding of the range of ? values will have to await explicit calculations. Experimental results on the Auger spectra are also given at lower kinetic energies, for shakeup states, and for higher-energy resonances, especially those involving vacancies in the core shells of the lower spin states. It is shown that, although transitions having the same final state of the singly charged ion frequently have similar relative intensities and ? values, occasionally they differ quite markedly. The theoretical consequences of variant behavior for processes having the same final states are also discussed.

Thomas A. Carlson; David R. Mullins; Charles E. Beall; Brian W. Yates; James W. Taylor; Dennis W. Lindle; Frederick A. Grimm

1989-02-01T23:59:59.000Z

27

Relativistic study of vuv radiation properties from Kr-Xe gas mixtures  

Science Journals Connector (OSTI)

In an effort to obtain a microscopic understanding of the origin of vuv emission from inert heavy-atom gas mixtures we present results from relativistic calculations of the krypton-xenon spectrum in the 68 000 cm-1 region. Calculations carried out on the interatomic interaction in the ground and in the low-lying spin-orbit excited states [0-(3P2), 0+(3P1), 1(3P1), 1(3P2), 2(3P1)] of the krypton-xenon dimer are presented. The calculations were executed in a two-step procedure in which the CCSD(T) model for the ground state and the CCSD response theory model for the excited states were used to obtain spin-free potential curves in the first step. A perturbational treatment of the spin-orbit interaction within the atomic mean-field approximation was applied in the next step. Large-core quasirelativistic effective core potentials with richly augmented valence basis sets and midbond functions were used. All calculations were corrected for basis set superposition errors by applying the counterpoise method. For all involved states, spin-orbit perturbed potential energy curves were computed and equilibrium geometries, potential well depths, and local extrema were determined. Vibrational analysis and Franck-Condon factors for the ground and 0+(3P1),1(3P1) states were also calculated. The geometry dependence of the electronic dipole transition matrix elements between all involved excited states and the ground state was investigated. Excitation energies and potentials were obtained that are in excellent agreement with results based on fitting to experimental data. Out of some earlier disparate experimental assignments of the character of the excited states of the KrXe complex, the present results adhere most closely to the ones presented by Pibel et al. [J. Chem. Phys. 101, 10 242 (1994)]. Analyzed together with the experimental data, the theoretical results provide a clear picture of the organization of exciplex states and of the origin of strong vuv emission from these states that follows from binary collisions of the heavy inert Kr and Xe atoms.

Branislav Jansík; Bernd Schimmelpfennig; Hans Ågren

2003-04-10T23:59:59.000Z

28

One-Electron Theory of the Bulk Properties of Crystalline Ar, Kr, and Xe  

Science Journals Connector (OSTI)

The cohesive energy as a function of lattice constant and the P-V relation for Ar, Kr, and Xe have been calculated at T=0 K in the static-lattice limit. The calculation employed the self-consistent augmented-plane-wave statistical-exchange (APW-X?) method, which, except for our own preliminary work, has not heretofore been applied to the study of the bulk properties of a van der Waals crystal. The agreement with experiment is at least semiquantitative with respect to the cohesive energies. The comparison with extant P V data is acceptable. By use of a static-lattice sum of a pair-potential function with undetermined parameters, an effective pair potential is determined, with fairly realistic parameter values as a result. Comparison with other energy-band calculations shows that the occupied one-electron energies found in this calculation are in good agreement with those found by other workers. The conduction-band energies are not a result that is usual in X? calculations. The over-all trends found in this calculation are related to those found by Averill in a recent APW-X? calculation on the alkali metals.

S. B. Trickey; F. R. Green; Jr.; Frank W. Averill

1973-11-15T23:59:59.000Z

29

Detection of the primary scintillation light from dense Ar, Kr and Xe with novel photosensitive gaseous detectors  

E-Print Network (OSTI)

The detection of primary scintillation light in combination with the charge or secondary scintillation signals is an efficient technique to determine the events t=0 as well as particle / photon separation in large mass TPC detectors filled with noble gases and/or condensed noble gases. The aim of this work is to demonstrate that costly photo-multipliers could be replaced by cheap novel photosensitive gaseous detectors: wire counters, GEMs or glass capillary tubes coupled with CsI photocathodes. We have performed systematic measurements with Ar, Kr and Xe gas at pressures in the range of 1-50 atm as well as some preliminary measurements with liquid Xe and liquid Ar. With the gaseous detectors we succeeded in detecting scintillation light produced by 22 keV X-rays with an efficiency of close to 100%. We also detected the scintillation light produced by bs (5 keV deposit energy) with an efficiency close to 25%. Successful detection of scintillation from 22 keV gammas open new experimental possibilities not only ...

Periale, L; Carlson, P J; Francke, T; Pavlopoulos, P; Picchi, P; Pietropaolo, F

2002-01-01T23:59:59.000Z

30

Intel® Advisor XE  

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

Advisor XE 2013 Threading Assistant Copyright 2012, Intel Corporation. All rights reserved. *Other brands and names are the property of their respective owners. Simplify and...

31

Resonances in the Photoionization Continuum of Kr and Xe  

Science Journals Connector (OSTI)

A total of 153 krypton resonances in the spectral region 500-337 Å, and 254 xenon resonances in the spectral region 600-375 Å are reported. The disposition of the detailed line lists are indicated. The analysis is very incomplete and will require detailed theoretical calculations to advance. In krypton, 45 resonances and in xenon, 56 resonances have been grouped into probable Rydberg series, for which classifications are suggested. In general, the resonances observed are due to the excitation of the inner subshell "s" electron (ns2np6?nsnp6mp) or to the excitation of two of the outer electrons simultaneously (ns2np6?ns2np4mll?). These highlying excited states autoionize, resulting in resonances with window-, asymmetric-, and absorption-type profiles. The detailed lists for the subshell "s" electron excitations are given.

K. Codling and R. P. Madden

1971-12-01T23:59:59.000Z

32

Population trapping in Kr and Xe in intense laser fields  

Science Journals Connector (OSTI)

We have observed trapping of population in Rydberg states of atoms and ions exposed to intense laser radiation. The trapping occurs in nonstationary ‘‘wave-packet’’ superposition states, created, via ac Stark-shifted multiphoton resonances during the laser pulse. The formation of these highly excited bound states requires the nonresonant absorption of up to 20 or more photons; some of the ionic Rydberg states lie nearly 32 eV above the ionic ground state. All of the trapped states having binding energies much less than the photon energy but remain stable against ionization even when the multiphoton ionization probability of the atom is saturated.

R. R. Jones; D. W. Schumacher; P. H. Bucksbaum

1993-01-01T23:59:59.000Z

33

Masses of Kr-77 and Kr-75  

E-Print Network (OSTI)

PHYSICAL REVIEW C VOLUME 35, NUMBER 4 Masses of Kr and Kr APRIL 1987 D. M. Moltz Nuclear Science Division, Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720 A. C. Betker, J. P. Sullivan, R. H. Burch, C. A... determinations of neutron deficient nu- clei between the 1f7/2 and lg9/2 shells are hampered by low production cross sections and complex decay schemes. The direct mass measurements' of the rubidium isotopes have provided a substantial base for other...

Moltz, D. M.; Betker, A. C.; Sullivan, J. P.; Burch, R. H.; Gagliardi, Carl A.; Tribble, Robert E.; Toth, K. S.; Avignone, F. T.

1987-01-01T23:59:59.000Z

34

Radioactive Kr Isotopes  

Science Journals Connector (OSTI)

A radioactive isotope of 1.1-hour half-life has been produced in krypton by alpha-particle bombardment of Se74, enriched electromagnetically from 0.9 percent to 14.1 percent. Assignment of the isotope is made to Kr77. Aluminum absorption measurements indicate a positron end point of 1.7 Mev. In addition to annihilation radiation, gamma-rays and K-capture have been observed. The ratio of K-capture to positron emission from the Se74(?,n) reaction is computed as 2.6. The krypton 1.42-day isotope has been produced by an ?,n reaction on electromagnetically enriched Se76. The isotope is located as Kr79 and its half-life confirmed. A positron end point of 1.0 Mev is determined by aluminum absorption measurements. In addition to annihilation radiation, gamma-rays and K-capture have been observed. The ratio of K-capture to positron emission from the Se76(?,n) reaction is computed to be 50. The cross-section ratio for formation of Kr77 compared to Kr79 by alpha-particle bombardment of selenium is computed as 1.4. The 4.6-hour Kr85 isotope has been produced by a Se(?,n) reaction.

L. L. Woodward; D. A. Mccown; M. L. Pool

1948-10-01T23:59:59.000Z

35

Cray XE6 Workshop  

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

Cray XE6 Workshop Cray XE6 Workshop February 7-8, 2011 Outline * About OpenMP * Parallel Regions * Using OpenMP on Hopper * Worksharing Constructs * Synchronization * Data Scope * Tasks * Hands-on Exercises 2 What is OpenMP * OpenMP is an industry standard API of C/C++ and Fortran for shared memory parallel programming. - OpenMP Architecture Review Board * Major compiler vendors: PGI, Cray, Intel, Oracle, HP, Fujitsu, Microsoft, AMD, IBM, NEC, Texas Instrument, ... * Research institutions: cOMPunity, DOE/NASA Labs, Universities... - Current standard: 3.0, released in 2008. - 3.1 draft just came out today for public comment. 3 OpenMP Components * Compiler Directives and Clauses - Interpreted when OpenMP compiler option is turned on. - Each directive applies to the succeeding

36

Elastic scattering of low-energy electrons by Ne, Ar, Kr, and Xe  

Science Journals Connector (OSTI)

We treat low-energy electron scattering by atoms within a Kohn-Sham-type one-particle theory. In applying this theory, all many-body effects involved in the projectile-target interaction are absorbed into a one-particle potential. Hence, one merely has to solve an elementary potential-scattering problem. However, there are two crucial points to be observed in the construction of the scattering potential. (1) The Kohn-Sham-type exchange-correlation potential must be formed by using correlation factors which are required to have certain asymptotic and integral properties. (2) Since the scattering process is viewed as being quasistationary, the unbound projectile state must be modified by a bell-jar-type envelope function to account for the effect of a finite residence time in the target where the projectile causes a finite perturbation. During this time the entire system has to be treated as consisting of N+1 indistinguishable electrons which in a Kohn-Sham-type theory are described by only N+1 self-consistent one-particle states. Once the analytical forms of the correlation factors and the envelope function have been chosen, the calculational procedure is completely parameter-free. Although it is considerably simpler than well-established methods in this field, it provides comparably good results on differential cross sections and scattering-induced polarizations in a wide range of impact energies (5–100 eV).

R. Haberland; L. Fritsche; J. Noffke

1986-04-01T23:59:59.000Z

37

Molecular Dynamics by Light Scattering in the Condensed Phases of Ar, Kr, and Xe  

Science Journals Connector (OSTI)

Temperature dependence of molecular dynamics as revealed by intermolecular and second-order Raman scattering in the condensed rare gases are reported with special emphasis on the behavior near the melting transition.

P. A. Fleury; J. M. Worlock; H. L. Carter

1973-03-26T23:59:59.000Z

38

Effect of molecular solutes on the electron drift velocity in liquid Ar, Kr, and Xe  

Science Journals Connector (OSTI)

Measurements of the electron drift velocity in liquid argon, krypton, and xenon were performed in an electric field up to 100 kV cm-1. At higher field strengths saturation velocities were observed in agreement with other authors. The addition of a small concentration of molecular solutes leads to an increase of the electron drift velocity above the saturation value of the pure liquid. The drift velocity either reaches a higher constant value or passes through a maximum at field strengths greater than 104 V cm-1. This effect was investigated as a function of solute concentration for N2, H2, methane, ethane, propane, and butane. Inelastic energy losses in collisions of electrons and solute molecules are assumed and by means of the Cohen-Lekner theory the energy dependence of the loss processes is derived.

K. Yoshino; U. Sowada; W. F. Schmidt

1976-07-01T23:59:59.000Z

39

Electron emission due to positronium annihilation in solid Ar, Kr, and Xe  

Science Journals Connector (OSTI)

We present measurements of positron and electron emission by solid rare-gas surfaces implanted with low-energy positrons. The electron yield exhibits a 0.5-eV-wide peak at a positron energy just above the threshold for positronium (Ps) formation, but below the electron-hole–pair threshold. A similar peak in the fraction of the incident positrons annihilating in the sample leads us to conclude that (1) slow Ps has an anomalously short diffusion length possibly due to self-trapping, and (2) energetic electrons are liberated from Ps atoms following annihilation of the positrons with valence electrons. The energy spectrum of the emitted electrons should contain information about the internal Ps wave function in the solids.

E. M. Gullikson and A. P. Mills; Jr.

1989-03-15T23:59:59.000Z

40

Synthesis of rare gas-halide mixtures resulting in efficient XeF(C. -->. A) laser oscillation  

SciTech Connect

Significantly improved XeF(C..-->..A) laser performance has been achieved using electron beam excitation of complex, multicomponent gas mixtures specifically tailored so as to reduce medium transient absorption in the blue-green region. Use of Ar and Kr together as the effective rare gas buffer-energy transfer species, along with a combination of NF/sub 3/ and F/sub 2/ to produce the desired F-donor molecule characteristics, has permitted synthesis of near optimum medium properties for which XeF(C) is produced efficiently while transient absorption is minimized. With this technique we have achieved laser pulse energy density and intrinsic efficiency of 2.2 +- 0.3 J/l and approx.1.5%, respectively, values that are comparable to those of the B..-->..X rare gas-halide lasers.

Nighan, W.L.; Tittel, F.K.; Wilson W.L. Jr.; Nishida, N.; Zhu, Y.; Sauerbrey, R.

1984-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "uus kr xe" 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

Multilayer Kr films adsorbed on BN  

Science Journals Connector (OSTI)

We report on the results of an adsorption isotherm study of multilayer Kr films adsorbed on BN. Measurements were conducted on a computer-controlled adsorption apparatus at 22 temperatures in the vicinity of the bulk-triple point of Kr. The data are compared with those available for Kr on graphite. The phase diagrams for both systems are topologically identical in the region between two and five layers. The layer critical temperatures for the second and third layers are essentially identical for Kr on both substrates; the high-temperature solidification transition of the second layer, on the other hand, is shifted on BN relative to where it occurs on graphite. The implications of our results for the current understanding of re-entrant layering are discussed.

A. Diama and A. D. Migone

1999-12-15T23:59:59.000Z

42

Monolayer Kr films adsorbed on BN  

Science Journals Connector (OSTI)

We have conducted a detailed study of Kr films adsorbed on BN. We have performed adsorption-isotherm measurements and calculations for the potential energy of Kr atoms on the surface of BN. Both the experimental and the theoretical results are extensively compared to data for Kr on graphite, as well as to data for N2 and CO on both BN and graphite. For N2 and CO, the energy calculations found similar corrugations on BN and on graphite (these two molecular adsorbates do not discriminate between the B and N atoms on the BN substrate). This is not the case for Kr. The corrugation for Kr atoms (which do discriminate between B and N) is quite different on BN from what it is on graphite. Our adsorption isotherms indicate that a commensurate solid phase is present for Kr on BN. However, this commensurate solid exists only over a surprisingly narrow temperature interval of less than 5 K. Our experimental results are compared with those from previous studies of this system. We offer possible explanations for the differences observed and attempt to present a coherent picture of the experimental situation for this system. © 1996 The American Physical Society.

W. Li; P. Shrestha; A. D. Migone; A. Marmier; C. Girardet

1996-09-15T23:59:59.000Z

43

Dynamics of Kr in dense clathrate hydrates  

Science Journals Connector (OSTI)

The dynamics of Kr atoms as guests in dense clathrate hydrate structures are investigated using site specific Kr83 nuclear resonant inelastic x-ray scattering (NRIXS) spectroscopy in combination with molecular dynamics simulations. The dense structure H hydrate and filled-ice structures are studied at high pressures in a diamond anvil high-pressure cell. The dynamics of Kr in the structure H clathrate hydrate quench recovered at 77 K is also investigated. The Kr phonon density of states obtained from the experimental NRIXS data are compared with molecular dynamics simulations. The temperature and pressure dependence of the phonon spectra provide details of the Kr dynamics in the clathrate hydrate cages. Comparison with the dynamics of Kr atoms in the low-pressure structure II obtained previously was made. The Lamb-Mossbauer factor obtained from NRIXS experiments and molecular dynamics calculations are in excellent agreement and are shown to yield unique information on the strength and temperature dependence of guest-host interactions.

D. D. Klug; J. S. Tse; J. Y. Zhao; W. Sturhahn; E. E. Alp; C. A. Tulk

2011-05-25T23:59:59.000Z

44

EP-MAC e-mail : jyoak@snu.ac.kr, sbahk@snu.ac.kr  

E-Print Network (OSTI)

EP-MAC *, e-mail : jyoak@snu.ac.kr, sbahk@snu.ac.kr Early Preamble MAC to reduce-cycled wireless sensor motes. In this paper we propose Early Preamble-MAC(EP-MAC) which enables to get enhanced performance of low energy and low latency. EP-MAC uses both early preamble and original simple preamble, so

Bahk, Saewoong

45

debussy@cs.yonsei.ac.kr, iklee@yonsei.ac.kr Affective Icons for Music Exploring  

E-Print Network (OSTI)

O debussy@cs.yonsei.ac.kr, iklee@yonsei.ac.kr Affective Icons for Music Exploring Min and colors of harmonograph curves. These curves can be used as icons for music retrieval, and we demonstrate. This approach is compatible with a standard icon-based file browser. . Introduction Since the appearance

Lee, In-Kwon

46

Bubble formation and Kr distribution in Kr-irradiated UO2  

SciTech Connect

In situ and ex situ transmission electron microscopy observation of small Kr bubbles in both single-crystal and polycrystalline UO2 were conducted to understand the inert gas bubble behavior in oxide nuclear fuel. The bubble size and volume swelling are shown as a weak function of ion dose but strongly depend on the temperature. The Kr bubble formation at room temperature was observed for the first time. The depth profiles of implanted Kr determined by atom probe tomography are in good agreement with the calculated profiles by SRIM, but the measured concentration of Kr is about 1/3 of calculated one. This difference is mainly due to low solubility of Kr in UO2 matrix, which has been confirmed by both density-functional theory calculations and chemical equilibrium analysis.

L.F. He; B. Valderrama; A.-R. Hassan; J. Yu; M. Gupta; J. Pakarinen; H.B. Henderson; J. Gan; M.A. Kirk; A.T. Nelson; M.V. Manuel; A. El-Azab; T.R. Allen

2015-01-01T23:59:59.000Z

47

Ultraviolet radiation produced in low-energy Ar + Ar and Kr + Kr collisions  

Science Journals Connector (OSTI)

Absolute cross sections for the emission of ultraviolet resonance line radiations from Ar and Kr atoms resulting from Ar + Ar and Kr + Kr collisions are reported. The energy range covered extends from near the reaction thresholds to 150 eV in the center-of-mass system. The emission cross sections are found to have energy dependencies very similar to those exhibited by the total ionization cross sections for the same reactants. The techniques used to make the measurements are described and the results are discussed in terms of a current theoretical model of the interactions.

H. L. Rothwell; Jr.; R. C. Amme; B. Van Zyl

1979-03-01T23:59:59.000Z

48

Impact-energy dependence of quasimolecular Auger emission in Kr-Kr collisions  

Science Journals Connector (OSTI)

The continuous electron emission in 150-, 450-, and 750-keV Kr-Kr collisions has been studied at a laboratory scattering angle of 15°. The analysis of the spectra in terms of quasimolecular Auger-electron emission superimposed on a "background" of directly ionized electrons indicates that many quasimolecular states are involved. This washes out structural details which have been expected from simple models.

A. P. Shergin; R. Stötzel; Z. Roller; R. Bilau; H. O. Lutz

1986-11-01T23:59:59.000Z

49

Control of XeF laser output by pulse injecton  

SciTech Connect

Injection locking is investigated as a means for control of optical pulse duration and polarization in a XeF laser. Intense short-pulse generation in the ultraviolet is achieved by injection of a low-level 1-ns optical pulse into a XeF oscillator. Control of laser output polarization by injection locking is demonstrated and studied as a function of injected signal level. Enhancement of XeF electric-discharge laser efficiency by injection pulse ''priming'' is observed.

Pacala, T.J.; Christensen, C.P.

1980-04-15T23:59:59.000Z

50

Diffusion of Kr Isotopes in Solid Ar  

Science Journals Connector (OSTI)

The diffusion coefficient D=D0e-Q0RT and isotope effect for Kr78 and Kr86 in solid Ar have been measured using a tracer technique. The activation energy QKr0 depends on the interchange parameter w, but is estimated to lie in the range 3500-3900 cal mole-1, with the most reliable w giving the lower value. Thus, the two calculated QKr0 (3853 and 4050 cal mole-1) for the vacancy mechanism using a two-body (12, 6) potential appear somewhat high, but in reasonable agreement with experiment. The isotope effect gives f?K?(D78D86-1)[(8678)12-1]=0.48±0.25 which, since QKr0?QAr0, suggests that ?K?0.6 for a single-vacancy mechanism. {Here f is the correlation factor and ?K?(?278?286-1)[(8678)12-1], where ?2 is the tracer jump rate.}

E. H. C. PARKER; B. L. SMITH; H. R. GLYDE

1969-12-15T23:59:59.000Z

51

Compton profiles of Ne, Ar, and Kr  

Science Journals Connector (OSTI)

Compton profiles of Ne, Ar, and Kr are calculated from ground-state energies and wave functions with full correlation contributions included. The latter is carried out by regarding atoms as inhomogeneous interacting electron-gas systems using the Kohn-Sham self-consistent scheme in the local-density approximation. The calculated values are brought closer to the experimental values from Hartree-Fock results. There are numerical problems for large atoms.

B. Y. Tong and L. Lam

1978-08-01T23:59:59.000Z

52

Cray XE6 Architecture John Shalf NERSC XE6 User Training  

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

XE6 Architecture XE6 Architecture John Shalf NERSC XE6 User Training Feb 7, 2011 2 NERSC-6 Grace "Hopper" Cray XE6 Performance 1.2 PF Peak 1.05 PF HPL (#5) Processor AMD MagnyCours 2.1 GHz 12-core 8.4 GFLOPs/core 24 cores/node 32-64 GB DDR3-1333 per node System Gemini Interconnect (3D torus) 6392 nodes 153,408 total cores I/O 2PB disk space 70GB/s peak I/O Bandwidth Potential System Architectures What is Possible Systems 2009 2015 +1/-0 2018 +1/-0 System peak 2 Peta 100-300 Peta 1 Exa Power 6 MW ~15 MW ~20 MW System memory 0.3 PB 5 PB 64 PB (+) Node performance 125 GF 0.5 TF or 7 TF 2 TF or 10TF Node memory BW 25 GB/s 0.2TB/s or 0.5TB/s 0.4TB/s or 1TB/s Node concurrency 12 O(100) O(1k) or 10k Total Node Interconnect BW 3.5 GB/s 100-200 GB/s

53

STANDARD OPERATING PROCEDURE for XeF2 Etcher Coral Name: XeF2  

E-Print Network (OSTI)

these operations. Use the up and down arrow keys to modify these timers. During training you will learn to write a recipe, and run a process. You must receive training before using the XeF2 etcher. Before operating the system power button. It should light. 3) Push the Vacuum Pump button. It should light. #12;Note

Reif, Rafael

54

Multiple ionization in single, low-MeV collisions of Kr ions with Kr atoms  

Science Journals Connector (OSTI)

The energy and relative intensities of L-MM Auger lines show that for low-MeV Kr+-Kr collisions most of the ionization takes place during the collision, due to the prompt emission of as many as 12 electrons per atom. The later decay of L-shell vacancies contributes in only a minor way to the final ionization state. These results provide insights into a variety of collision phenomena, including shifts in Auger and x-ray energies, fluorescence yields, and equilibrium charge distributions in high-Z foils.

P. deGroot; M. J. Zarcone; Q. C. Kessel

1987-09-15T23:59:59.000Z

55

Simulations of Xe and U diffusion in UO2  

SciTech Connect

Diffusion of xenon (Xe) and uranium (U) in UO{sub 2} is controlled by vacancy mechanisms and under irradiation the formation of mobile vacancy clusters is important. Based on the vacancy and cluster diffusion mechanisms established from density functional theory (DFT) calculations, we derive continuum thermodynamic and diffusion models for Xe and U in UO{sub 2}. In order to capture the effects of irradiation, vacancies (Va) are explicitly coupled to the Xe and U dynamics. Segregation of defects to grain boundaries in UO{sub 2} is described by combining the bulk diffusion model with models of the interaction between Xe atoms and vacancies with grain boundaries, which were derived from atomistic calculations. The diffusion and segregation models were implemented in the MOOSE-Bison-Marmot (MBM) finite element (FEM) framework and the Xe/U redistribution was simulated for a few simple microstructures.

Andersson, Anders D. [Los Alamos National Laboratory; Vyas, Shyam [Los Alamos National Laboratory; Tonks, Michael R. [Idaho National Laboratory; Casillas, Luis [Los Alamos National Laboratory; Uberuaga, Blas P. [Los Alamos National Laboratory; Millett, Paul [Idaho National Laboratory

2012-09-10T23:59:59.000Z

56

Enhanced high-order harmonic generation from Xe, Kr, and Ar in a capillary discharge B. A. Reagan,1  

E-Print Network (OSTI)

.17Up, where Ip is the ionization potential of the target atom and Up is the ponderomotive energy in poor phase-matching and conversion efficiency. Finally, the loss of the laser energy due, Delaware 19716, USA Received 26 February 2007; published 17 July 2007 We report the use of a preionized

Rocca, Jorge J.

57

Stark broadening of Kr UV spectral lines  

Science Journals Connector (OSTI)

This work reports new data for the Stark parameters of doubly ionized krypton spectral lines. Stark widths and shifts of Kr iii lines belonging to the UV region (245–300 nm) have been measured. A low-pressure pulsed arc, containing a mixture of 8% krypton and 92% helium, was used as a plasma source. Measured electron densities and electron temperatures were in the range (0.7–2.0)×1023 m-3 and 16 000–20 000 K, respectively. Experimentally obtained data were compared to theoretical results calculated using simplified modified semiempirical formulas.

M. ?irišan; R. J. Peláez; S. Djurovi?; J. A. Aparicio; S. Mar

2011-01-24T23:59:59.000Z

58

Concentration Independent Calibration of ?-? Coincidence Detector Using 131mXe and 133Xe  

SciTech Connect

Absolute efficiency calibration of radiometric detectors is frequently difficult and requires careful detector modeling and accurate knowledge of the radioactive source used. In the past we have calibrated the b-g coincidence detector of the Automated Radioxenon Sampler/Analyzer (ARSA) using a variety of sources and techniques which have proven to be less than desirable.[1] A superior technique has been developed that uses the conversion-electron (CE) and x-ray coincidence of 131mXe to provide a more accurate absolute gamma efficiency of the detector. The 131mXe is injected directly into the beta cell of the coincident counting system and no knowledge of absolute source strength is required. In addition, 133Xe is used to provide a second independent means to obtain the absolute efficiency calibration. These two data points provide the necessary information for calculating the detector efficiency and can be used in conjunction with other noble gas isotopes to completely characterize and calibrate the ARSA nuclear detector. In this paper we discuss the techniques and results that we have obtained.

McIntyre, Justin I.; Cooper, Matthew W.; Carman, April J.; Bowyer, Ted W.; Day, Anthony R.; Haas, Derek A.; Hayes, James C.; Heimbigner, Tom R.; Hubbard, Charles W.; Litke, Kevin E.; Ripplinger, Michael D.; Schrom, Brian T.; Suarez, Reynold

2009-12-01T23:59:59.000Z

59

Formation of solid Kr nanoclusters in MgO  

Science Journals Connector (OSTI)

The phenomenon of positron confinement enables us to investigate the electronic structure of nanoclusters embedded in host matrices. Solid Kr nanoclusters are a very interesting subject of investigation because of the very low predicted value of the positron affinity of bulk Kr. In this work, positron trapping in solid Kr nanoclusters embedded in MgO is investigated. The Kr nanoclusters were created by means of 280 keV Kr ion implantation in single crystals of MgO(100) and subsequent thermal annealing at a temperature of 1100 K. The nanoclusters were observed by cross-sectional transmission electron microscopy in high-resolution mode. The fcc Kr nanoclusters are rectangularly shaped with sizes of 2 to 5 nm and are in a cube-on-cube orientation relationship with the MgO host matrix. From the Moiré fringes in high-resolution recordings, the lattice parameter of the solid Kr was deduced and found to vary from 5.3 to 5.8 Å. The corresponding pressures are 0.6–2.5 GPa as found using the Ronchi equation of state. The relationship between lattice parameter and cluster size was investigated and it was found that the lattice parameter increases linearly with increasing nanocluster size. The defect evolution during annealing was monitored by means optical absorption spectroscopy and positron beam analysis. No evidence of positron trapping was found despite the very low positron affinity of solid Kr. Alternative definitions of the positron affinity are proposed for application to insulator materials.

M. A. van Huis; A. van Veen; H. Schut; B. J. Kooi; J. Th. M. De Hosson

2003-06-10T23:59:59.000Z

60

Collective potential energy surfaces of light mass Kr isotopes  

Science Journals Connector (OSTI)

Collective potential energy surface calculations have been performed for Kr74-80 nuclei in the framework of the Gneuss and Greiner model. The collective Hamiltonian is diagonalized in the basis of the five-dimensional quadrupole oscillator. Our calculations suggest that the Kr78,80 nuclei are ? unstable with a triaxial minimum at ??40°. The Kr74,76 nuclei have two axially symmetric minima with the 01+ ground state being located mainly in the deformed minimum, whereas the first excited 02+ state is located in the spherical minimum. The calculations also indicate that the ground state wave function for Kr74 is spread over both the minima.[NUCLEAR STRUCTURE Kr74,76,78,80: Calculated potential energy surfaces; compared with experimental energy levels and B(E2) values.

M. Seiwert; A. V. Ramayya; J. Maruhn

1984-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "uus kr xe" 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

Charge Spectrometry for Kr79-Br79  

Science Journals Connector (OSTI)

The distribution in charge of the Br79 atoms formed in the complex electron capture and ?+ decay of radioactive Kr79 has been found to consist of two components; one to be mostly associated with the ?+ transitions, and the other with the electron capture transitions. Because of a difference in instrumental efficiency, the relative intensity of the two components is undetermined in the present work, but if the value of 9.3 is assumed for the total electron-capture/?+ ratio, then the spectrum for the successive charges -1, 0, +1...+13 is as follows (figures in percent): 7.7, 3.7 (estimated), 4.0, 4.7, 12.7, 16.0, 14.3, 13.6, 11.3, 7.7, 3.3, 0.68, 0.13, 0.054, and 0.014, respectively.

Arthur H. Snell; F. Pleasonton; John L. Need

1959-12-15T23:59:59.000Z

62

Optically polarized {sup 129}Xe NMR investigation of carbon nanotubes  

SciTech Connect

We demonstrate the utility of optically polarized {sup 129}Xe NMR in a convection cell for measuring the surface properties of materials. In particular, we show adsorption of xenon gas on oxidatively purified single- and multiwalled carbon nanotubes. The interaction between xenon and multiwalled nanotubes produced by chemical vapor deposition was stronger than that of single- or multiwalled nanotubes produced by carbon arc discharge. Xenon was observed in gas, liquid, and adsorbed phases. The large polarization and moderate pressures of xenon ({approx}0.2 MPa) allowed resolution of multiple lines in both the gas and condensed phases of xenon in contact with carbon nanotubes. Xe gas exchanges with physisorbed xenon in two different environments. Xe adsorbs preferentially on defects, but if the number of defects is not sufficient, it will also adsorb on surface and interstitial sites. Penetration of Xe in the tube interior was not observed.

Clewett, Catherine F. M.; Morgan, Steven W.; Saam, Brian; Pietrass, Tanja [Department of Physics, Fort Hays State University, Hays, Kansas 67601 (United States); Department of Physics, University of Utah, Salt Lake City, Utah 84112 (United States); Department of Chemistry, New Mexico Tech, Socorro, New Mexico 87801 (United States)

2008-12-15T23:59:59.000Z

63

Evidence for Deformed Ground States in Light Kr Isotopes  

Science Journals Connector (OSTI)

The levels in Kr74,76 were studied with in-beam ?-spectroscopy techniques and the ?+ decay of Rb76. The energies of the 21+ states in Kr74,76 deviate from smooth behavior compared with the higher spin levels. The yrast cascade B(E2)'s are highly collective. The Kr74,76 ground states have unusually large deformation. The origin of this deformation and of shape coexistence in this region is described in terms of the protons driving the deformation.

R. B. Piercey; J. H. Hamilton; R. Soundranayagam; A. V. Ramayya; C. F. Maguire; X. -J. Sun; Z. Z. Zhao; R. L. Robinson; H. J. Kim; S. Frauendorf; J. Döring; L. Funke; G. Winter; J. Roth; L. Cleemann; J. Eberth; W. Neumann; J. C. Wells; J. Lin; A. C. Rester; H. K. Carter

1981-11-23T23:59:59.000Z

64

Comments on Diffusion of Kr Isotopes in Solid Ar  

Science Journals Connector (OSTI)

Recently, the isotope effect for Kr diffusion in Ar was found to be f?K?0. 48. The results are consistent with a divacancy diffusion mechanism with ?K?1.

J. J. Burton

1970-10-15T23:59:59.000Z

65

Collision-Induced Light Scattering in Gaseous Ar and Kr  

Science Journals Connector (OSTI)

Light scattering attributable to a change in polarizability produced in colliding pairs of atoms is observed in gaseous Ar and Kr. The experimental results are qualitatively accounted for by relations between the integrated intensity and the collision-induced polarizability.

J. P. McTague and George Birnbaum

1968-09-02T23:59:59.000Z

66

Cognitive Radio Network {swjang, sbahk}@netlab.snu.ac.kr  

E-Print Network (OSTI)

2010 Cognitive Radio Network , , {swjang, sbahk}@netlab.snu.ac.kr Analysis of Average Opportunities in Cognitive Radio Networks Seowoo Jang, Saewoong Bahk INMC, EECS, Seoul National University Cognitive Radio Network . Primary user

Bahk, Saewoong

67

Microfluidics {sjauh, btzhang}@bi.snu.ac.kr  

E-Print Network (OSTI)

Microfluidics {sjauh, btzhang}@bi.snu.ac.kr Solving Shortest Path Problems Using Microfluidics Sahng-Joon Auh and Byoung-Tak Zhang Biointelligence Lab, School of Computer Science and Engineering Seoul National University . microfluidics MEMS

68

Origin of anomalous Xe-H in nanodiamond stardust  

SciTech Connect

Still today, the nucleosynthesis origin of Xe-H in presolar nanodiamonds is far from understood. Historically possible explanations were proposed by a secondary “neutron-burst” process occurring in the He- or C/O-shells of a type-II supernova (SN-II), which are, however, not fully convincing in terms of modern nucleosynthesis conditions. Therefore, we have investigated Xe isotopic abundance features that may be diagnostic for different versions of a classical, primary r-process in high-entropy-wind (HEW) ejecta of core-collapse SN-II. We report here on parameter tests for non-standard r-process variants, by varying electron abundances (Y{sub e}), ranges of entropies (S) and expansion velocities (V{sub exp}) with their correlated neutron-freezeout times (?(freeze)) and temperatures (T{sub 9}(freeze)). From this study, we conclude that a best fi to the measured Xe-H abundance ratios {sup i}Xe/{sup 136}Xe can be obtained with the high-S “main” component of a “cold” r-process variant.

Kratz, K. L. [Max-Planck-Institut für Chemie, Otto-Hahn-Institut, D-55128 Mainz, Germany and Fachbereich Chemie, Pharmazie und Geowissenschaften, Universitat Mainz, Mainz (United States); Farouqi, K. [Max-Planck-Institut für Chemie, Otto-Hahn-Institut, D-55128 Mainz, Germany and Zentrum für Astronomie der Universität Heidelberg, D-69120 Heidelberg (Germany); Hallmann, O. [Max-Planck-Institut für Chemie, Otto-Hahn-Institut, D-55128 Mainz (Germany); Pfeiffer, B. [II. Physikalisches Institut, Univ. Giessen, D-35392 Giessen (Germany); Ott, U. [Max-Planck-Institut für Chemie, Otto-Hahn-Institut, D-55128 Mainz (Germany); Univ. of West Hungary, H-9700 Szombathely (Hungary)

2014-05-09T23:59:59.000Z

69

New Features of the Hopper XE6 - Differences from Franklin  

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

New Features of the Hopper XE6 New Features of the Hopper XE6 New Features of the Hopper XE6 - Differences from Franklin While the Franklin and Hopper systems are both have similar programming environments and user software, there are some key architectural differences between the two systems. This page describes those differences and how they may improve your productivity. More Cores per Node and Multiple Sockets per Node Hopper has a total of 24 cores on each node. With more cores per node, you may want to explore adding OpenMP to applications. Hopper also has two sockets on each compute node whereas Franklin only has one. Please see the Hopper mutli-core FAQ page for a discussion of effectively using all 24 cores per node and the Hopper configuration page for more system specification details.

70

Verification of a XeCl* laser model by measurement of the plasma conductivity  

Science Journals Connector (OSTI)

Measurements of current, voltage, and laser emission of an X-ray preionized selfsustained XeCl* laser discharge using Ne:Xe:HCl gas mixtures are compared with predictions of spatially homogeneous model calculatio...

G. Stielow; Th. Hammer; W. Bötticher

1988-12-01T23:59:59.000Z

71

{sup 129}Xe-Cs (D{sub 1},D{sub 2}) versus {sup 129}Xe-Rb (D{sub 1}) spin-exchange optical pumping at high xenon densities using high-power laser diode arrays  

SciTech Connect

We investigate {sup 129}Xe-Cs (D{sub 1},D{sub 2}) spin exchange optical pumping (SEOP) at high Xe densities ({approx}0.12-2.44 amagat) using newly available high-power (>40 W) laser diode arrays and compare with {sup 129}Xe-Rb D{sub 1} SEOP under similar conditions. At elevated Xe densities, the spin-exchange rate (per alkali-metal atom, {gamma}{sup '}) for Cs-{sup 129}Xe is {approx}1.5-fold greater than that for Rb-{sup 129}Xe. Higher spin-exchange rates and lower {sup 129}Xe spin-destruction rates for Cs-{sup 129}Xe versus Rb-{sup 129}Xe contribute to {approx}twofold improvement in {sup 129}Xe nuclear spin polarization measured at 9.4 T - with the largest gains observed at the highest Xe densities.

Whiting, Nicholas; Eschmann, Neil A.; Goodson, Boyd M.; Barlow, Michael J. [Department of Chemistry and Biochemistry, Southern Illinois University, Carbondale, Illinois 62901 (United States); Sir Peter Mansfield Magnetic Resonance Centre, University of Nottingham, Nottingham, NG7 2RD (United Kingdom)

2011-05-15T23:59:59.000Z

72

n-Selective Single Capture Following Xe{sup 18+} And Xe{sup 54+} Impact On Na(3s) And Na*(3p)  

SciTech Connect

State selective single charge exchange n-level cross sections are calculated for collisions of Xe18+ and Xe54+ ions with Na(3s) and Na*(3p) over the energy range of 0.1 to 10.0 keV/amu. The CTMC method is used which includes all two-body interactions. Experimental state-selective cross sections and their corresponding transverse momentum spectra for Xe18+ are found to be in reasonable accord with the calculations.

Otranto, S. [CONICET and Dto. de Fisica, Universidad Nacional del Sur, 8000 Bahia Blanca (Argentina); Olson, R. E. [Physics Department, Missouri University of Science and Technology, Rolla, MO 65401 (United States); Hasan, V. G.; Hoekstra, R. [KVI-Atomic and Molecular Physics, University of Groeningen (Netherlands)

2011-06-01T23:59:59.000Z

73

Nuclear matter radii of neutron-deficient Kr isotopes  

Science Journals Connector (OSTI)

Interaction cross sections (?I) of Kr72,76,80 on a C target were measured at the projectile fragment separator FRS at GSI. Effective matter radii of the nuclei were deduced by a Glauber model analysis so as to reproduce the experimental ?I. An increase of matter radii toward the proton drip-line is observed. We compare the extracted radii to theoretical predictions, which are based on Skyrme-Hartree-Fock-Bogoliubov (SHFB) and on relativistic mean field (RMF) approaches. The enhancement of the matter radius observed in Kr72 is discussed.

T. Yamaguchi et al.

2008-03-31T23:59:59.000Z

74

FBDEditor: {ldalove, atang34, syjsmk, jbyoo}@konkuk.ac.kr  

E-Print Network (OSTI)

}@konkuk.ac.kr : Programmable Logic Controller (PLC) . Field Programmable Gate Array (FPGA) . PLC Function Controller (PLC) Field Programmable Gate Array (FPGA) . PLC IEC 61131-3 5 (LD: Ladder diagram) . FBD Function Block(FB) . FBD PLC . FPGA Hardware Description Language

75

2D 3D * iklee)@yonsei.ac.kr  

E-Print Network (OSTI)

1 2012 2D 3D * 0 , 1 , 2 0,2 1 ( 0 skrcjstk, 2 iklee)@yonsei.ac.kr 1 rinthel Science, Yonsei University. 1 Dept. of Information Media, The University of Suwon. 2D 3D . 2D - , 3D (Disparity) 3D . . 1. 3D 3D . 3D 3D [1

Lee, In-Kwon

76

High power KrF laser development at Los Alamos  

SciTech Connect

The objective of the high power laser development program at Los Alamos is to appraise the potential of the KrF laser as a driver for inertial confinement fusion (ICF), ultimately at energy levels that will produce high target gain (gain of order 100). A KrF laser system prototype, the 10-kJ Aurora laser, which is nearing initial system operation, will serve as a feasibility demonstration of KrF technology and system design concepts appropriate to large scale ICF driver systems. The issues of affordable cost, which is a major concern for all ICF drivers now under development, and technology scaling are also being examined. It is found that, through technology advances and component cost reductions, the potential exists for a KrF driver to achieve a cost goal in the neighborhood of $100 per joule. The authors suggest that the next step toward a multimegajoule laboratory microfusion facility (LMF) is an ''Intermediate Driver'' facility in the few hundred kilojoule to one megajoule range, which will help verify the scaling of driver technology and cost to an LMF size. An Intermediate Driver facility would also increase the confidence in the estimates of energy needed for an LMF and would reduce the risk in target performance. 5 refs., 4 figs., 1 tab.

McDonald, T.; Cartwright, D.; Fenstermacher, C.; Figueira, J.; Goldstone, P.; Harris, D.; Mead, W.; Rosocha, L.

1988-01-01T23:59:59.000Z

77

Configuration of Hopper, NERSC's Cray XE6 System  

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

Configuration Configuration Configuration Hopper is NERSC's first peta-flop system, a Cray XE6, with a peak performance of 1.28 Petaflops/sec, 153,216 compute cores for running scientific applications, 217 Terabytes of memory, and 2 Petabytes of online disk storage. MC-proc.png Compute Nodes Hopper has 6,384 compute nodes made up of 2 twelve-core AMD 'MagnyCours'. Read More » login.jpg Login Nodes When you ssh to hopper.nersc.gov, you are connecting to a "login node." Read More » jaguar xt4 Interconnect A description of the custom Cray-designed network that Hopper uses for inter-node communication. Read More » xe6blade.png Support Nodes A description of other kinds of nodes included in Hopper for job launch, file systems, networking, and other services. Read More »

78

High-accuracy mass measurements of neutron-rich Kr isotopes  

Science Journals Connector (OSTI)

The atomic masses of the neutron-rich krypton isotopes Kr84,86-95 have been determined with the tandem Penning trap mass spectrometer ISOLTRAP with uncertainties ranging from 20 to 220 ppb. The masses of the short-lived isotopes Kr94 and Kr95 were measured for the first time. The masses of the radioactive nuclides Kr89 and Kr91 disagree by 4 and 6 standard deviations, respectively, from the present Atomic-Mass Evaluation database. The resulting modification of the mass surface with respect to the two-neutron separation energies as well as implications for mass models and stellar nucleosynthesis are discussed.

P. Delahaye; G. Audi; K. Blaum; F. Carrel; S. George; F. Herfurth; A. Herlert; A. Kellerbauer; H.-J. Kluge; D. Lunney; L. Schweikhard; C. Yazidjian

2006-09-28T23:59:59.000Z

79

Search for Neutrinoless Double-Beta Decay in 136 Xe with EXO-200  

E-Print Network (OSTI)

Search for Neutrinoless Double-Beta Decay in 136 Xe with EXO-200 M. Auger,1 D. J. Auty,2 P. S on a search for neutrinoless double-beta decay of 136Xe with EXO-200. No signal is observed for an exposure a lower limit on the half-life of the neutrinoless double-beta decay T0#12;#12; 1=2 ð136Xe� > 1:6 � 1025

Piepke, Andreas G.

80

Kr ion irradiation study of the depleted-uranium alloys.  

SciTech Connect

Fuel development for the reduced enrichment research and test reactor (RERTR) program is tasked with the development of new low enrichment uranium nuclear fuels that can be employed to replace existing high enrichment uranium fuels currently used in some research reactors throughout the world. For dispersion type fuels, radiation stability of the fuel-cladding interaction product has a strong impact on fuel performance. Three depleted-uranium alloys are cast for the radiation stability studies of the fuel-cladding interaction product using Kr ion irradiation to investigate radiation damage from fission products. SEM analysis indicates the presence of the phases of interest: U(Al, Si){sub 3}, (U, Mo)(Al, Si){sub 3}, UMo{sub 2}Al{sub 20}, U{sub 6}Mo{sub 4}Al{sub 43} and UAl{sub 4}. Irradiations of TEM disc samples were conducted with 500 keV Kr ions at 200 C to ion doses up to 2.5 x 10{sup 19} ions/m{sup 2} ({approx}10 dpa) with an Kr ion flux of 10{sup 16} ions/m{sup 2}/s ({approx}4.0 x 10{sup -3} dpa/s). Microstructural evolution of the phases relevant to fuel-cladding interaction products was investigated using transmission electron microscopy.

Gan, J.; Keiser, D. D.; Miller, B. D.; Kirk, M. A.; Rest, J.; Allen, T. R.; Wachs, D. M. (Materials Science Division); (INL); (Univ. of Wisconsin)

2010-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "uus kr xe" 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

Kr Ion Irradiation Study of the Depleted-Uranium Alloys  

SciTech Connect

Fuel development for the Reduced Enrichment Research and Test Reactor program is tasked with the development of new low-enriched uranium nuclear fuels that can be employed to replace existing highly enriched uranium fuels currently used in some research reactors throughout the world. For dispersion-type fuels, radiation stability of the fuel/cladding interaction product has a strong impact on fuel performance. Three depleted uranium alloys are cast for the radiation stability studies of the fuel/cladding interaction product using Kr ion irradiation to investigate radiation damage from fission products. SEM analysis indicates the presence of the phases of interest: U(Si, Al)3, (U, Mo)(Si, Al)3, UMo2Al20, U6Mo4Al43, and UAl4. Irradiations of TEM disc samples were conducted with 500 keV Kr ions at 200ºC to ion doses up to 2.5 × 1015 ions/cm2 (~ 10 dpa) with an Kr ion flux of 1012 ions/cm2-sec (~ 4.0 × 10-3 dpa/sec). Microstructural evolution of the phases relevant to fuel-cladding interaction products was investigated using transmission electron microscopy.

J. Gan; D. Keiser; B. Miller; M. Kirk; J. Rest; T. Allen; D. Wachs

2010-12-01T23:59:59.000Z

82

I-XE ANALYSES OF TAGISH LAKE MAGNETITE AND MONAHANS HALITE. A. Busfield1 , J. D. Gil-  

E-Print Network (OSTI)

- leases were dominated by iodine-derived xenon (129 Xe/132 Xe > 10 consistently). This sample produced of solar sys- tem history. Acknowledgements: We are grateful to R. Wieler for providing the halite grain

Grossman, Lawrence

83

Charge-exchange EUV spectroscopy in collisions of Xe{sup q+} (q=7-9) with rare gases  

SciTech Connect

Extreme ultraviolet (EUV) emission spectra have been measured in charge exchange collisions between Xe{sup q+} (q=7--9) and rare gases at an energy of 20 q keV. We have observed 4, 22, and 39 lines in collisions of Xe{sup 7+}, Xe{sup 8+}, and Xe{sup 9+}. Of these emission lines, four lines of Xe vii, eight lines of Xe viii, and nine lines of Xe ix correspond to newly observed transitions. The identification procedure is described in detail. The aim of this work is to obtain spectroscopic data for multiply charged Xe ions. In addition, the electron capture mechanism is also discussed using the crude classical over-the-barrier model to understand the target dependence of the emission spectra.

Tanuma, H.; Ohashi, H.; Yamamoto, N.; Kato, D.; Murakami, I.; Fujioka, S.; Nishimura, H.; Nishihara, K. [Department of Physics, Tokyo Metropolitan University, 1-1 Minami-Ohsawa, Hachioji, Tokyo 192-0397 (Japan); National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292 (Japan); Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita, Osaka 565-0871 (Japan)

2011-10-15T23:59:59.000Z

84

MARMOT simulations of Xe segregation to grain boundaries in UO2  

SciTech Connect

Diffusion of Xe and U in UO{sub 2} is controlled by vacancy mechanisms and under irradiation the formation of mobile vacancy clusters is important. We derive continuum thermodynamic and diffusion models for Xe and U in UO{sub 2} based on the vacancy and cluster diffusion mechanisms established from recent density functional theory (DFT) calculations. Segregation of defects to grain boundaries in UO{sub 2} is described by combining the diffusion model with models of the interaction between Xe atoms and vacancies with grain boundaries derived from separate atomistic calculations. The diffusion and segregation models are implemented in the MOOSE/MARMOT (MBM) finite element (FEM) framework and we simulate Xe redistribution for a few simple microstructures. In this report we focus on segregation to grain boundaries. The U or vacancy diffusion model as well as the coupled diffusion of vacancies and Xe have also been implemented, but results are not included in this report.

Andersson, Anders D. [Los Alamos National Laboratory; Tonks, Michael [Idaho National Laboratory; Casillas, Luis [Los Alamos National Laboratory; Millett, Paul [Idaho National Laboratory; Vyas, Shyam [Los Alamos National Laboratory; Uberuaga, Blas P. [Los Alamos National Laboratory; Nerikar, Pankaj [IBM

2012-06-20T23:59:59.000Z

85

Amplified spontaneous emission over the XeF(D+X) transition in solid Kr H. Kunttu, W. G. Lawrence, and V. A. Apkariar?)  

E-Print Network (OSTI)

represent a novel family of lasers. High energy density, high efficiency, broad tunability, low pump, and these states are a! Alfred P. Sloan Fellow. efficiently populated by energy transfer from the high-lying to observe stimulated emission in other condensed phasetriatomic exciplexes, be it in solid, liquid

Apkarian, V. Ara

86

Structural Determination of the Hydrophobic Hydration Shell of Kr  

Science Journals Connector (OSTI)

We report the first direct measurement by extended x-ray absorption fine structure spectroscopy of the hydrophobic hydration shell of the noble gas krypton. Measurements were made in aqueous solution at gas pressures in the range 20 to 100 bars and at a temperature of 320 K. Data of excellent quality were collected taking advantage of the high brilliance of a third generation synchrotron radiation source. An advanced data analysis procedure has been applied to determine the Kr-O partial radial distribution function in the short range.

Adriano Filipponi; Daniel T. Bowron; Colin Lobban; John L. Finney

1997-08-18T23:59:59.000Z

87

First result of the experimental search for the 2K-capture of Xe-124 with the copper proportional counter  

E-Print Network (OSTI)

First result of experiment for searching of 2K-capture of Xe-124 with the large-volume copper proportional counter is given. The 12 litre sample with 63.3% (44 g) of Xe-124 was used in measurements. The limit on the half-life of Xe-124 with regard to 2K(2\

Yu. M. Gavrilyuk; A. M. Gangapshev; V. V. Kazalov; V. V. Kuzminov; S. I. Panasenko; S. S. Ratkevich; D. A. Tekueva; S. P. Yakimenko

2014-04-22T23:59:59.000Z

88

Decay of the resonantly excited states of atomic Kr  

Science Journals Connector (OSTI)

The 3p-1?5s1 resonant excitation energy and decay width of Kr atoms are calculated by an ab initio Green’s-function method. The dipolar relaxation energy shift of the 3p-1?5s1 resonantly excited state of Kr atoms is predominantly due to the 3p-15s1?3d-25s1?f super-Coster-Kronig (sCK) spectator decay process. The calculated excitation energies are overestimated by about 1.0 eV. The decay widths for 3p1/2-1?5s1 and 3p3/2-1?5s1 resonantly excited states are 2.08 and 1.88 eV, respectively. They are larger than the decay widths of the 3p1/2-1 and 3p3/2-1 core-level ionized states. The increase of the decay width is a result of the decrease of 3p-15s1?3d-25s1?f sCK spectator decay and the increase of 3p-15s1?3d-14s(p)-15s1?p(d) CK spectator decay. The changes of the (s)CK decay rates are due to the screening of the final two-hole-state potential by the resonantly excited 5s electron.

Masahide Ohno

1995-02-01T23:59:59.000Z

89

Ultra-Sensitive CoUinear Fast Ion Beam Trace Detection of ^^Kr  

E-Print Network (OSTI)

, USA Texas A&M University Qatar 'TRIUMF, Vancouver, Canada inergy Institute, Tokc Coming Inc., USA tracer gas for exploring the reservoir structure of large oil fields. *^Kr detection in ambient air of large oil fields. ^^Kr detection in ambient air is also of importance for monitoring nuclear activities

Schuessler, Hans

90

GraXe, graphene and xenon for neutrinoless double beta decay searches  

E-Print Network (OSTI)

We propose a new detector concept, GraXe (to be pronounced as grace), to search for neutrinoless double beta decay in Xe-136. GraXe combines a popular detection medium in rare-event searches, liquid xenon, with a new, background-free material, graphene. In our baseline design of GraXe, a sphere made of graphene-coated titanium mesh and filled with liquid xenon (LXe) enriched in the Xe-136 isotope is immersed in a large volume of natural LXe instrumented with photodetectors. Liquid xenon is an excellent scintillator, reasonably transparent to its own light. Graphene is transparent over a large frequency range, and impermeable to the xenon. Event position could be deduced from the light pattern detected in the photosensors. External backgrounds would be shielded by the buffer of natural LXe, leaving the ultra-radiopure internal volume virtually free of background. Industrial graphene can be manufactured at a competitive cost to produce the sphere. Enriching xenon in the isotope Xe-136 is easy and relatively cheap, and there is already near one ton of enriched xenon available in the world (currently being used by the EXO, KamLAND-Zen and NEXT experiments). All the cryogenic know-how is readily available from the numerous experiments using liquid xenon. An experiment using the GraXe concept appears realistic and affordable in a short time scale, and its physics potential is enormous.

J. J. Gomez-Cadenas; F. Guinea; M. M. Fogler; M. I. Katsnelson; J. Martin-Albo; F. Monrabal; J. Muñoz-Vidal

2011-10-27T23:59:59.000Z

91

GraXe, graphene and xenon for neutrinoless double beta decay searches  

SciTech Connect

We propose a new detector concept, GraXe (to be pronounced as grace), to search for neutrinoless double beta decay in {sup 136}XE. GraXe combines a popular detection medium in rare-event searches, liquid xenon, with a new, background-free material, graphene. In our baseline design of GraXe, a sphere made of graphene-coated titanium mesh and filled with liquid xenon (LXe) enriched in the {sup 136}XE isotope is immersed in a large volume of natural LXe instrumented with photodetectors. Liquid xenon is an excellent scintillator, reasonably transparent to its own light. Graphene is transparent over a large frequency range, and impermeable to the xenon. Event position could be deduced from the light pattern detected in the photosensors. External backgrounds would be shielded by the buffer of natural LXe, leaving the ultra-radiopure internal volume virtually free of background. Industrial graphene can be manufactured at a competitive cost to produce the sphere. Enriching xenon in the isotope {sup 136}XE is easy and relatively cheap, and there is already near one ton of enriched xenon available in the world (currently being used by the EXO, KamLAND-Zen and NEXT experiments). All the cryogenic know-how is readily available from the numerous experiments using liquid xenon. An experiment using the GraXe concept appears realistic and affordable in a short time scale, and its physics potential is enormous.

Gómez-Cadenas, J.J.; Martín-Albo, J.; Monrabal, F.; Vidal, J. Muñoz [Instituto de Física Corpuscular (IFIC), CSIC and Universitat de Valencia, Calle Catedrático José Beltrán, 2, 46980 Valencia (Spain); Guinea, F. [Instituto de Ciencia de Materiales de Madrid (ICMM), CSIC, Calle Sor Juana Inés de la Cruz, 3, 28049 Madrid (Spain); Fogler, M.M. [Department of Physics, University of California San Diego, 9500 Gilman Drive, La Jolla, California 92093 (United States); Katsnelson, M.I., E-mail: gomez@mail.cern.ch, E-mail: paco.guinea@icmm.csic.es, E-mail: mfogler@ucsd.edu, E-mail: katsnel@sci.kun.nl, E-mail: justo.martin-albo@ific.uv.es, E-mail: francesc.monrabal@ific.uv.es, E-mail: jmunoz@ific.uv.es [Institute for Molecules and Materials, Radboud University Nijmegen, Heijendaalseweg 135, 6525 AJ Nijmegen (Netherlands)

2012-02-01T23:59:59.000Z

92

Boson effective charges for light Se, Kr, and Sr isotopes  

Science Journals Connector (OSTI)

A consistent analysis of E2 transition probabilities for nine neutron-deficient even-even Se, Kr, and Sr isotopes has been performed, based on previous parametrizations for these nuclei within the proton-neutron interacting-boson model, from which boson effective charges e? and e? are deduced. Two sets of effective charges are obtained, one set having e??e? for most of the nuclei studied, and the other set having e? substantially larger than e? for most of the nuclei. For both sets, e? tends to decrease with increasing neutron number, while e? is roughly constant. More information on mixed-symmetry states is needed to determine which set is valid.

A. F. Barfield and K. P. Lieb

1990-04-01T23:59:59.000Z

93

Presentations from Using the Cray XE6 Training at NERSC February 7-8, 2011  

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

Presentations Presentations Presentations Video Compiling Code on the Cray XE6 Using the CrayPat Performance Tool at NERSC Performance Evaluatation Introduction to UPC Running Jobs on Hopper Downloads Gerber-HPC.pdf | Adobe Acrobat PDF file An introduction to HPC Systems. Presented by Richard Gerber, NERSC. ShalfXE6ArchitectureSM.pdf | Adobe Acrobat PDF file A description of the Cray XE6 architecture. Presented by John Shalf, NERSC. Compiling-Cunningham.pdf | Adobe Acrobat PDF file An introduction to compiling in the Cray XE6 environment. Presented by Rob Cunningham, Los Alamos National Laboratory Running-Turner.pdf | Adobe Acrobat PDF file An introduction to running parallel jobs on Hopper. Presented by David Turner, NERSC. UPC-Yelick.pdf | Adobe Acrobat PDF file An introduction to Unified Parallel C (UPC), a Partitioned Global Address

94

Spectroscopic studies of XeCl-laser-induced plasma on Ti targets in nitrogen containing atmospheres  

Science Journals Connector (OSTI)

This work deals with the study of a plasma produced by intense XeCl-excimer-laser irradiation of a titanium surface in nitrogen-containing atmospheres. We observed that the optical emission spectra ... from irrad...

M. L. De Giorgi; J. Hermann; A. Luches; A. Perrone; L. Renna

1994-06-01T23:59:59.000Z

95

Web Documents for Using the Cray XE6 Training at NERSC February...  

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

directory: projectprojectstrainingXE6-feb-2011 Files is this directory can be browsed on the web at http:portal.nersc.govprojecttraining Last edited: 2011-04-01 07:36:44...

96

Progress towards an optimized ¹²?Xe / ³He Zeeman maser and a test of boost symmetry  

E-Print Network (OSTI)

We report on a search for an annual variation of a daily sidereal modulation of the frequency difference between co-located ¹²?Xe and ³He Zeeman masers that sets a stringent limit on boost-dependent Lorentz and CPT violation ...

Canè, Federico

2006-01-01T23:59:59.000Z

97

On the use of 127Xe standards for the quality control of CTBTO noble gas stations and support laboratories  

Science Journals Connector (OSTI)

Abstract 127Xe has a longer half-life than 131mXe, it can be easily purely produced and it is present in the environment at very low level. For these reasons, 127Xe is supposed to be a convenient quality control radionuclide for remote noble gas stations of the International Monitoring System (IMS) network. As CEA/DAM has recently developed two new photon/electron setups for low-level detection of 131mXe, 133mXe, 133Xe and 135Xe, we took the opportunity to test these setups for the measurement of a 127Xe standard. The results and a detailed description of these measurements are presented in this paper. They illustrate the complexity of 127Xe decay, emitting simultaneously several ?, X-rays, conversion electrons and Auger electrons; this results in highly summated coincidence spectra. The measurements performed provide precise electron energy calibration of the setups. The count rate of electrons in coincidence with iodine K? X-rays was found to be surprisingly low, leading to the study of electron-gated photon spectrum. Finally, a comparison of three photon/electron coincidence spectra obtained with three different setups is given. The use of 127Xe as a standard for energy calibration of IMS noble gas station is possible, but it appears to be quite complicated for efficiency check of noble gas station equipped with ?/? detectors.

A. Cagniant; G. Le Petit; B. Nadalut; P. Gross; H. Richard-Bressand; J.-P. Fontaine; G. Douysset

2014-01-01T23:59:59.000Z

98

Ionization, charge exchange, and excitation in F + Ar and F + Kr collisions  

Science Journals Connector (OSTI)

We have measured projectile and target x-ray cross sections for F + Ar and F + Kr collisions using fluorine beams of charge states 7 +, 8 +, and 9+ with energies from 20 to 76 MeV. Pronounced enhancements for the Ar K and Kr L vacancy cross sections using F9+ ions compared to those for the 7+ projectile can be explained by charge exchange as described by an empirically scaled Brinkman-Kramers theory. The Ar L, Kr K and Kr M cross sections are found to exhibit features expected for Coulomb ionization. The projectile K x-ray production for the 9+ ion is accounted for by charge exchange processes. Predictions of the first Born approximation for direct single-step excitation to bound states by the target nucleus overestimate the observed cross sections for F7+ and F8+.

Forrest Hopkins; Rudiger Brenn; Anthony R. Whittemore; Nelson Cue; Vince Dutkiewicz; R. P. Chaturvedi

1976-01-01T23:59:59.000Z

99

Numerical atomic basis orbitals from H to Kr  

Science Journals Connector (OSTI)

We present a systematic study for numerical atomic basis orbitals ranging from H to Kr, which could be used in large scale O(N) electronic structure calculations based on density-functional theories (DFT). The comprehensive investigation of convergence properties with respect to our primitive basis orbitals provides a practical guideline in an optimum choice of basis sets for each element, which well balances the computational efficiency and accuracy. Moreover, starting from the primitive basis orbitals, a simple and practical method for variationally optimizing basis orbitals is presented based on the force theorem, which enables us to maximize both the computational efficiency and accuracy. The optimized orbitals well reproduce convergent results calculated by a larger number of primitive orbitals. As illustrations of the orbital optimization, we demonstrate two examples: the geometry optimization coupled with the orbital optimization of a C60 molecule and the preorbital optimization for a specific group such as proteins. They clearly show that the optimized orbitals significantly reduce the computational efforts, while keeping a high degree of accuracy, thus indicating that the optimized orbitals are quite suitable for large scale DFT calculations.

T. Ozaki and H. Kino

2004-05-28T23:59:59.000Z

100

Search for a permanent electric dipole moment using liquid 129Xe  

SciTech Connect

Search for an electric dipole moment is one of the best motivated low-energy approaches for investigating physics beyond the Standard Model. Our experimental effort is focused on improving the limit on EDM in liquid 129Xe to put constraints on nuclear CP-violating interactions. High nuclear spin density and high electrical breakdown strength make 129Xe a promising medium for EDM searches. At the time the project started, the transverse nuclear spin relaxation time T2 of 129Xe was unknown. We made measurements of T2 using NMR spin-echo techniques and found that it is exceeds 1300 sec, the longest relaxation time ever measured in a liquid [1]. We also began to investigate non-linear dipolar interaction effects in a high-density spin-polarized liquid Xe. In the second iteration of the experiment we setup a high-Tc SQUID system in magnetic shields and performed detailed studies of Xe spin precession. We developed a model for non-linear dipolar interactions and found that for one set of conditions non-linear interactions can delay spin dephasing due to magnetic field gradients, while for another set of conditions they can lead to exponential amplification of the spin precession signals [2]. Our experimental data were in good quantitative agreement with predictions of the model. We also developed a series of numerical simulations to understand various imperfections in the system and made detailed experimental measurements to confirm these numerical predictions [3]. We demonstrated that non-linear interactions can amplify small precession signals and achieved an amplification factor of 10 [4]. This general phenomenon can be used in other precision measurements with non-linear interactions. We also explored practical applications of the liquid Xe system that we developed. We demonstrated that by mixing Xe with organic liquids, such as cyclopentane, one can enhance the proton spin polarization by a factor of 106 [5]. We have used this technique to perform the first measurement of the scalar J-coupling between nuclear spins in van-der-Waals molecules, something that has never been observed before. More recently, we constructed a liquid-He apparatus to acquire Xe spin precession data using a low-Tc SQUID and achieved a signal-to-noise ratio of 106. We are currently investigating factors affecting the stability of Xe spin precession signals in this system using a superconducting magnetic shield and a persistent current magnetic field coil.

PROFESSOR MICHAEL ROMALIS

2008-11-24T23:59:59.000Z

Note: This page contains sample records for the topic "uus kr xe" 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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101

GraXe, graphene and xenon for neutrinoless double beta decay searches  

E-Print Network (OSTI)

We propose a new detector concept, GraXe (to be pronounced as grace), to search for neutrinoless double beta decay in Xe-136. GraXe combines a popular detection medium in rare-event searches, liquid xenon, with a new, background-free material, graphene. Our baseline design of GraXe is a balloon made of graphene (possibly held together with a very thin structure made of radiopure fiber) and filled with xenon enriched in the Xe-136 isotope. The balloon is immersed in a large tank containing 20 tons of natural liquid xenon and instrumented with large photomultipliers. Liquid xenon is an excellent scintillator, reasonably transparent to its own light. Graphene is transparent over a large frequency range, an impermeable to the xenon. External backgrounds would be shielded by the buffer liquid xenon, and the inner volume has virtually zero background. Industrial graphene can be manufactured at a competitive cost to produce the inner balloon, and there is already near one ton of enriched Xenon available in the world...

Gomez-Cadenas, J J; Fogler, M M; Katsnelson, M I; Martin-Albo, J; Monrabal, F; Muñoz-Vidal, J

2011-01-01T23:59:59.000Z

102

Solvation effects on chemical reaction dynamics in clusters: Photodissociation of HI in XeNHI  

Science Journals Connector (OSTI)

The photodissociation of HI in clusters of the type XeNHI is studied theoretically to explore the possible occurrence and dynamics of the cage effect in small clusters (from N=1 to 12). The method used describes the H atom quantum mechanically, the heavy atoms classically. It is found that a cage effect, corresponding to transient vibrations of the H between heavy atoms, exists for all clusters, including XeHI. For N5 the resonances are long lived and dominate the process. Steric and structural factors cause this behavior.

R. Alimi and R. B. Gerber

1990-03-19T23:59:59.000Z

103

Near-yrast, medium-spin structure of {sup 143}Xe  

SciTech Connect

Excited states in {sup 143}Xe, populated in spontaneous fission of {sup 248}Cm, are studied by means of {gamma} spectroscopy using the EUROGAM 2 Ge array. We identify three rotational bands in {sup 143}X: a decoupled band originating from the i{sub 13/2} neutron excitation, a strongly coupled band based on the 5/2{sup -} ground state, and a decoupled band based on the 322.9-keV level with spin 9/2. The new excitation scheme of {sup 143}Xe is compared to quasiparticle-rotor model calculations, performed with a reflection-symmetric potential.

Rzaca-Urban, T. [Faculty of Physics, University of Warsaw, ulica Hoza 69, PL-00-681 Warsaw (Poland); Urban, W. [Faculty of Physics, University of Warsaw, ulica Hoza 69, PL-00-681 Warsaw (Poland); Institut Laue-Langevin, 6 rue J. Horowitz, F-38042 Grenoble Cedex 9 (France); Pinston, J. A. [Laboratoire de Physique Subatomique et de Cosmologie, Universite Joseph Fourier Grenoble 1, CNRS/IN2P3, Institut National Polytechnique de Grenoble, F-38026 Grenoble Cedex (France); Smith, A. G. [School of Physics and Astronomy, University of Manchester, Manchester M13 9PL (United Kingdom); Ahmad, I. [Argonne National Laboratory, Argonne, Illinois 60439 (United States)

2011-06-15T23:59:59.000Z

104

Reactions of XeF/sub 2/ with thermally grown SiO/sub 2/  

SciTech Connect

The reactions of XeF/sub 2/ on thermally grown SiO/sub 2/ were studied. XeF/sub 2/ does not readily undergo a dissociative chemisorption on these surfaces. Damaging the oxide with 500-eV argon ions enhances this process significantly through the creation of active sites. XPS analysis of the resulting adlayer, together with molecular-orbital model calculations, reveal the presence of fluorine bound to both silicon and oxygen. The oxyfluoride species can be removed from the surface by annealing the crystal to 200 C.

Joyce, S.; Langan, J.G.; Steinfeld, J.I.

1988-01-01T23:59:59.000Z

105

Structure and heat capacity of Ne and Xe adsorbed on a bundle of carbon nanotubes  

E-Print Network (OSTI)

The structural and thermal properties of Ne and Xe gases adsorbed on the outer surface of a large nanotube bundle have been evaluated with computer simulation. The potential energy model and numerical techniques were used previously to study Ar [N. M. Urban, S. M. Gatica, M. W. Cole, and J. L. Riccardo, ``Correlation functions and thermal properties of Ar adsorbed on the external surface of a bundle of carbon nanotubes'', Phys. Rev. B 71, 245410 (2005)]. Heat capacity results for Ne and Xe exhibit peaks associated with reordering and ``stripe'' melting transitions for these gases.

Daniel E. Shai; Nathan M. Urban; Milton W. Cole

2007-02-08T23:59:59.000Z

106

PHOTOELECTRON AND AUGER ELECTRON ASYMMETRIES: ALIGNMENT OF Xe{sup +}({sup 2}D{sub 5/2}) BY PHOTOIONIZATION  

SciTech Connect

Angular distributions of photoelectrons from the Xe 4d subshell, and N{sub 4,5}oo Auger electrons, have been measured using synchrotron radiation. The 4d asymmetry parameter exhibits strong oscillations with energy, in agreement with several theoretical calculations. The Auger electrons show large asymmetries due to alignment of Xe{sup +} by photoionization.

Southworth, S. H.; Kobrin, P. H.; Truesdale, C. M.; Lindle, D.; Owaki, S.; Shirley, D. A.

1980-12-01T23:59:59.000Z

107

Wavelengths and oscillator strengths of Xe II from the UVES spectra of four HgMn stars  

E-Print Network (OSTI)

In spite of large overabundances of Xe II observed in numerous mercury-manganese (HgMn) stars, Xe II oscillator strengths are only available for a very limited number of transitions. As a consequence, several unidentified lines in the spectra of HgMn stars could be due to Xe II. In addition, some predicted Xe II lines are redshifted by about 0.1 A from stellar unidentified lines, raising the question about the wavelength accuracy of the Xe II line data available in the literature. For these reasons we investigated the Xe II lines lying in the 3900-4521 A, 4769-7542 A, and 7660-8000 A spectral ranges of four well-studied HgMn stars. We compared the Xe II wavelengths listed in the NIST database with the position of the lines observed in the high-resolution UVES spectrum of the xenon-overabundant, slowly rotating HgMn stars HR 6000, and we modified them when needed. We derived astrophysical oscillator strengths for all the Xe II observed lines and compared them with the literature values, when available. In this...

Yüce, K; Hubrig, S

2011-01-01T23:59:59.000Z

108

Spectral evolution in an electron beam pumped XeF laser  

SciTech Connect

A spectral sweep in the 353-nm band of an electron beam pumped XeF laser has been investigated. The time-integrated lasing spectra broaden as the pulse length, electron beam pump rate, and intracavity flux are increased. Several possible explanations are discussed.

Harris, D.G.; Burde, D.H.; Malins, R.J.; Tillotson, J.H.

1987-10-19T23:59:59.000Z

109

Zero electron kinetic energy spectroscopy of the XeCl Thomas Lenzer,a)  

E-Print Network (OSTI)

measurements for the neutral state we construct a Morse­Morse-switching­van der Waals model potential functionZero electron kinetic energy spectroscopy of the XeCl� anion Thomas Lenzer,a) Ivan Yourshaw, Berkeley, California 94720 Received 9 November 2001; accepted 21 December 2001 Zero electron kinetic energy

Neumark, Daniel M.

110

Zero electron kinetic energy and photoelectron spectroscopy of the XeI anion  

E-Print Network (OSTI)

spectroscopic data we construct model potentials for the anion and three neutral states, which are comparedZero electron kinetic energy and photoelectron spectroscopy of the XeI anion Thomas Lenzer, Michael and the corresponding neutral X1/2, I3/2, and II1/2 electronic states have been studied by means of zero electron

Neumark, Daniel M.

111

Longitudinal discharge XeCl excimer laser with automatic UV preionization  

SciTech Connect

A longitudinal discharge XeCl 308-nm excimer laser operated with automatic spark UV preionization is reported. Laser oscillation has been obtained using a four-segmented longitudinal discharge tube of 260 mm length and 4 mm inner diameter and employing a capacitor transfer circuit with commercially available doorknob ceramic capacitors. Spark UV preionization has been found to increase the laser output energy.

Furuhashi, H.; Hiramatsu, M.; Goto, T.

1987-04-06T23:59:59.000Z

112

Efficient XeF(C. -->. A) laser oscillation using electron-beam excitation  

SciTech Connect

Significantly improved XeF(C..-->..A) laser energy density and efficiency have been obtained using electron-beam excited Ar-Xe gas mixtures at pressures up to 10 atm which contain both NF/sub 3/ and F/sub 2/. Maximum blue-green laser pulse energy density in excess of 1.0 J/liter was obtained, corresponding to an intrinsic electrical-optical energy conversion efficiency estimated to be in the 0.5%--1.0% range. Comprehensive, time-resolved absolute measurements of XeF(C..-->..A) fluorescence, laser energy, and gain were carried out for a wide variety of experimental conditions. Analysis of these data has resulted in identification of the dominant transient absorbing species in the laser medium. For the laser mixtures investigated in this work, the primary blue/green absorption processes have been identified as photoionization of the 4p, 3d, and higher lying states of Ar, and of the Xe 6p and 5d states, and photodissociation of Ar/sub 2/(/sup 3/summation/sup +//sub u/) and Ar/sup +//sub 3/.

Nachshon, Y.; Tittel, F.K.; Wilson, W.L. Jr.; Nighan, W.L.

1984-07-01T23:59:59.000Z

113

Optical properties of Xe under very high pressure (*) (+) J. M. Besson, J.-P. Itie  

E-Print Network (OSTI)

observations of insulator-metal phase transitions in elementary systems. Among these, rare gas solids in the resistivity of the interdigitated electrodes when the setup is loaded with Xe. The authors of [7] interpret. The electrical behaviour that has been reported [7] can be assigned neither to a transition to a metal nor

Paris-Sud XI, Université de

114

Study of velocity-changing collisions in excited Kr using saturation spectroscopy  

Science Journals Connector (OSTI)

A saturated-absorption experiment is used to measure the effects of velocity-changing collisions between Kr* metastable atoms (4p55s[32]2) and He and Ar perturbers. Comparison between experimental profiles and profiles calculated assuming hard-sphere collisions between Kr* and perturber atoms confirms the calculations of Borenstein and Lamb concerning the change of velocity associated with a collision. Furthermore it is found that the rate of velocity-changing collisions is consistent with the predictions of kinetic theory.

C. Brechignac; R. Vetter; P. R. Berman

1978-05-01T23:59:59.000Z

115

Quantum statistical effect on ionizing collisions of ultracold metastable Kr isotopes  

Science Journals Connector (OSTI)

Ultracold ionizing collisions of laser-cooled Kr isotopes in the 1s5[4p55s:3P2] metastable state are investigated. When the collision energy is reduced below the p-wave centrifugal barrier of 80 ?K, the ratio of the ionizing collision rate between polarized and unpolarized Kr83 atoms is found to decrease. This is a direct evidence of the quantum interference of two identical Fermi particles. The experimental results are compared with the calculation based on the simplified inelastic collision theory.

Hidetoshi Katori; Hideyuki Kunugita; Tetsuya Ido

1995-12-01T23:59:59.000Z

116

RACKS, LEIBNIZ ALGEBRAS AND YETTER-DRINFEL'D ULRICH KR AHMER AND FRIEDRICH WAGEMANN  

E-Print Network (OSTI)

RACKS, LEIBNIZ ALGEBRAS AND YETTER-DRINFEL'D MODULES ULRICH KR ¨AHMER AND FRIEDRICH WAGEMANN. This provides a unified framework for examples of racks in the category of coalgebras discussed recently racks 8 3.5. Linearised augmented racks 9 3.6. Regular functions on augmented racks 10 3.7. The Yetter

Wagemann, Friedrich

117

Elastic scattering of intermediate-energy electrons by Ar and Kr  

Science Journals Connector (OSTI)

Using the relative-flow technique elastic differential cross sections ?? (Ar or Kr ) for Ar and Kr relative to ?? (He) have been measured at impact energies of 3, 5, 7.5, 10, 15, 20, 30, 50, 75, and 100 eV. The angular range covered is from 20° to 135°. These ratios have been multiplied by the recently measured values of ??(He) to obtain ??(Ar or Kr ). The differential cross section curves for both Ar and Kr show deep minima. The positions of these minima have been obtained with an accuracy of ±2°. The cross sections in the angular regions lying between 0° and 20° and 135° and 180° could not be measured owing to instrumental limitations. In these regions estimates of the shapes of differential cross section (DCS) curves have been made by fitting the data obtained from 20° to 135° with a phase-shift analysis, while the normalization to the absolute scale was obtained by normalizing these fits to the relative flow measurements. From these estimates and the measured values of the differential cross section, integral and momentum-transfer cross sections have been obtained. The error limits for the differential, integral, and momentum-transfer cross sections have been estimated as 20, 30, and 30%, respectively.

S. K. Srivastava; H. Tanaka; A. Chutjian; S. Trajmar

1981-05-01T23:59:59.000Z

118

Function Block Diagrams * {ekjee, jbyoo, suhyun, cha}@dependable.kaist.ac.kr  

E-Print Network (OSTI)

}@dependable.kaist.ac.kr : FBD(Function Block Diagram) FBD . PLC FBD C . FBD . FBD Center(ITRC). RLL(Relay Ladder Logic) , . PLC(Programmable Logic Controller) [2] , LD(Ladder Diagram) FBD(Function Block Diagram) PLC . PLC . PLC

119

Proc. KR2004 1 A Logic of Arbitrary and Indefinite Objects  

E-Print Network (OSTI)

Proc. KR2004 1 A Logic of Arbitrary and Indefinite Objects Stuart C. Shapiro Department of Computer 1992; Shapiro 2000c; Shapiro & The SNePS Implementa- tion Group 2002). SNePS is a propositional. Copyright c 2004, Stuart C. Shapiro. All rights reserved. In the remainder of this section, we will give

Shapiro, Stuart C.

120

Grant Review and Support Program K-R Longitudinal Support Initiative Workshop  

E-Print Network (OSTI)

Grant Review and Support Program (GRASP) K-R Longitudinal Support Initiative Workshop September 12:00-10:30 Write Winning Grants Dr. M. S. AtKisson · Introduction to the Seminar · How to Develop and Evaluate a Fundable Idea for a Grant Application (8:30-10:15) LUNCH (12:00-1:00) Write Winning Grants Dr. M. S. At

Church, George M.

Note: This page contains sample records for the topic "uus kr xe" 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

Seoul National University http://bp.snu.ac.kr The Role of Carbon Incorporation in  

E-Print Network (OSTI)

O2 · Hydrothermal followed by carbonization at 500°C J. Phys. Chem. C 113, 20504 (2009). J. PhysSeoul National University http://bp.snu.ac.kr The Role of Carbon Incorporation in SnO2 of cracks during cycling Sn-Based Oxide Li Metal Carbon-Coated SnO2 #12;Seoul National University http

Park, Byungwoo

122

The onset of optical breakdown in KrF-laser-irradiated silica glass surfaces  

E-Print Network (OSTI)

A synthetic fused silica obtained from Tosoh SGM Co., ESL-1000 (OH % 1200 wt. ppm), with a thick- ness of 2 mmThe onset of optical breakdown in KrF-laser-irradiated silica glass surfaces Y. Kawaguchia,* , A Research Center, National Institute of Advanced Industrial Science and Technology, Tsukuba Central 5, 1

Dickinson, J. Thomas

123

Radioactive decay of 9.2-min Im130 to levels of Xe130  

Science Journals Connector (OSTI)

The ?-ray transitions following the decay of 9.2-min Im130 have been measured using Ge(Li) Compton-suppressed ?-ray spectrometry. Three new levels in Xe130 have been proposed at 2762.6, 2644.9, and 2307.8 keV and new ? branches observed to four levels at 1632.6, 2385.5, 2544.4, and 2637.5 keV. The results are compared with those of other recent studies and the difficulties of finding an adequate theoretical description discussed.[RADIOACTIVITY Im130 from I129(n,?). Measured E?, I?. Xe130, deduced levels, E?, I?, J, ?. Enriched target. Ge(Li) detector.

Richard A. Meyer and William B. Walters

1974-06-01T23:59:59.000Z

124

Search for Neutrinoless Double-Beta Decay in $^{136}$Xe with EXO-200  

E-Print Network (OSTI)

We report on a search for neutrinoless double-beta decay of $^{136}$Xe with EXO-200. No signal is observed for an exposure of 32.5 kg-yr, with a background of ~1.5 x 10^{-3} /(kg yr keV) in the $\\pm 1\\sigma$ region of interest. This sets a lower limit on the half-life of the neutrinoless double-beta decay $T_{1/2}^{0\

M. Auger; D. J. Auty; P. S. Barbeau; E. Beauchamp; V. Belov; C. Benitez-Medina; M. Breidenbach; T. Brunner; A. Burenkov; B. Cleveland; S. Cook; T. Daniels; M. Danilov; C. G. Davis; S. Delaquis; R. deVoe; A. Dobi; M. J. Dolinski; A. Dolgolenko; M. Dunford; W. Fairbank Jr.; J. Farine; W. Feldmeier; P. Fierlinger; D. Franco; G. Giroux; R. Gornea; K. Graham; G. Gratta; C. Hall; K. Hall; C. Hargrove; S. Herrin; M. Hughes; A. Johnson; T. N. Johnson; A. Karelin; L. J. Kaufman; A. Kuchenkov; K. S. Kumar; D. S. Leonard; F. Leonard; D. Mackay; R. MacLellan; M. Marino; B. Mong; M. Montero Diez; A. R. Muller; R. Neilson; R. Nelson; A. Odian; I. Ostrovskiy; K. O'Sullivan; C. Ouellet; A. Piepke; A. Pocar; C. Y. Prescott; K. Pushkin; P. C. Rowson; J. J. Russell; A. Sabourov; D. Sinclair; S. Slutsky; V. Stekhanov; T. Tolba; D. Tosi; K. Twelker; P. Vogel; J. -L. Vuilleumier; A. Waite; T. Walton; M. Weber; U. Wichoski; J. Wodin; J. D. Wright; L. Yang; Y. -R. Yen; O. Ya. Zeldovich

2012-05-25T23:59:59.000Z

125

Detection of $^{133}$Xe from the Fukushima nuclear power plant in the upper troposphere above Germany  

E-Print Network (OSTI)

After the accident in the Japanese Fukushima Dai-ichi nuclear power plant in March 2011 large amounts of radioactivity were released and distributed in the atmosphere. Among them were also radioactive noble gas isotopes which can be used as tracers to test global atmospheric circulation models. This work presents unique measurements of the radionuclide $^{133}$Xe from Fukushima in the upper troposphere above Germany. The measurements involve air sampling in a research jet aircraft followed by chromatographic xenon extraction and ultra-low background gas counting with miniaturized proportional counters. With this technique a detection limit of the order of 100 $^{133}$Xe atoms in litre-scale air samples (corresponding to about 100 mBq/m$^3$) is achievable. Our results provide proof that the $^{133}$Xe-rich ground level air layer from Fukushima was lifted up to the tropopause and distributed hemispherically. Moreover, comparisons with ground level air measurements indicate that the arrival of the radioactive plume at high altitude over Germany occurred several days before the ground level plume.

Hardy Simgen; Frank Arnold; Heinfried Aufmhoff; Robert Baumann; Florian Kaether; Sebastian Lindemann; Ludwig Rauch; Hans Schlager; Clemens Schlosser; Ulrich Schumann

2014-12-05T23:59:59.000Z

126

FRACTIONAL SKEW MONOID RINGS P. ARA, M.A. GONZ'ALEZ-BARROSO, K.R. GOODEARL, AND E. PARDO  

E-Print Network (OSTI)

FRACTIONAL SKEW MONOID RINGS P. ARA, M.A. GONZ'ALEZ-BARROSO #12; 2 P. ARA, M.A. GONZ'ALEZ-BARROSO, K.R. GOODEARL, AND E. PARDO In this paper

Bigelow, Stephen

127

Multielectron inner-shell photoexcitation in absorption spectra of Kr: Theory and experiment  

Science Journals Connector (OSTI)

The probability of Kr 1s photoionization alone and accompanied by 4p, 3d, 3p, 2s, and 2s4p excitations has been calculated as a function of photon energy in the vicinity of the respective thresholds; pertinent energies have been computed including relativistic, quantum-electrodynamic, and relaxation effects. Sharp features from two-electron excitations are expected in absorption spectra only if at least one of the electrons undergoes a transition to a bound state; this becomes less probable in inner shells. An absorption-spectrometry experiment on Kr has been performed with synchrotron radiation; results generally confirm the predictions but also point toward refinements that are required in the theory and the need for improvements in techniques and synchrotron-radiation sources.

Stephen J. Schaphorst; Alojz F. Kodre; Johannes Ruscheinski; Bernd Crasemann; Teijo Åberg; Jukka Tulkki; Mau Hsiung Chen; Yoshiro Azuma; George S. Brown

1993-03-01T23:59:59.000Z

128

Resolution of hyperfine transitions in metastable 83Kr using Electromagnetically Induced Transparency  

E-Print Network (OSTI)

Narrow linewidth signals of Electromagnetically Induced Transparency (EIT) in the metastable 83Kr have been observed for the first time. Various hyperfine transitions in 4p55s[3/2]2 to 4p55p[5/2]3 manifolds of 83Kr have been identified through the experimentally observed EIT signals. Some unresolved or poorly resolved hyperfine transitions in saturated absorption spectroscopy (SAS) are clearly resolved in the present work. Using the spectral separation of these EIT identified hyperfine transitions, the magnetic hyperfine constant (A) and the electric quadrupole hyperfine constant (B) are determined with improved accuracy for 4p55s[3/2]2 and 4p55p[5/2]3 manifolds.

Kale, Y B; Tiwari, V B; Singh, S; Rawat, H S

2015-01-01T23:59:59.000Z

129

Gamma-gamma directional correlation measurements in 84Kr following thermal neutron capture by natural krypton  

Science Journals Connector (OSTI)

Directional correlations of gamma-ray cascades in 84Kr have been measured following thermal neutron capture by a pressurised natural krypton gas target. Gamma-ray singles spectra were measured up to 5.5 MeV and the correlation data were obtained for the energy range 0.2-2.5 MeV. A decay scheme was developed on the basis of coincidence measurements. The data allow spin-parity assignments to be made to most levels lying below 3.5 MeV and multipole mixing ratios to be evaluated for the more intense transitions. The results are fitted to the SU(5) limit of the IBM-1 and to the IBM-2 and are also compared with the predictions of the dynamic deformation model which indicates that 84Kr is the only krypton isotope with a prolate equilibrium shape. A possible mixed symmetry 2+ state at 2.623 MeV is identified.

S A Hamada; W D Hamilton; F Hoyler

1987-01-01T23:59:59.000Z

130

Impurity-quenched orientational epitaxy of Kr layers on Pt(111)  

Science Journals Connector (OSTI)

The assumption that minute defects and impurities may be the cause for discrepancies between experiment and theory on physisorbed films is confirmed for the first time in direct experiments. A change of 30° in the orientation of a Kr layer on Pt(111) induced by H and CO precoverages as low as 0.1%, via the blocking of step sites, is demonstrated by high-resolution He diffraction.

Klaus Kern; Peter Zeppenfeld; Rudolf David; Robert L. Palmer; George Comsa

1986-12-22T23:59:59.000Z

131

Ion expansion characteristics from a KrF-laser-produced plasma  

Science Journals Connector (OSTI)

Two groups of ions are observed in an aluminum plasma produced by focusing a Raman-compressed KrF-laser beam (268 nm) on thick planar targets in the intensity range 5×1011–1013 W/cm2. The angular distribution, velocity distribution, energy partition between the two groups, and scaling of the ion velocities with laser intensity are presented. The role of lateral energy transport in generating the two groups of ions is discussed.

P. D. Gupta; Y. Y. Tsui; R. Popil; R. Fedosejevs; A. A. Offenberger

1986-05-01T23:59:59.000Z

132

Lifetimes of the Low-Energy M1 Transitions in La137 and Kr83  

Science Journals Connector (OSTI)

Using conventional time to pulse-height techniques, the lifetimes of the low-lying levels in La137 and Kr83 have been measured, despite the low ?-ray energies (10 and 9.3 keV) and the large internal conversion coefficients (130 and 11). The results of 89±4 and 147±4 nsec, respectively, correspond to retardation factors of 370 and 45 over the single-particle model predictions for those M1 transitions.

S. L. Ruby; Y. Hazoni; M. Pasternak

1963-01-15T23:59:59.000Z

133

Comparison of neutron capture spectra taken by a constellation Xe-110 detector and a 1?×1? NaI(Tl) crystal  

Science Journals Connector (OSTI)

Constellation Technology Corporation has developed a spectroscopic nuclear ... Xe-110, which suggests that the superior energy resolution and low background level of this...

R. A. Austin; D. Hooten

2009-02-01T23:59:59.000Z

134

Total Neutron Cross Section of Xe135 as a Function of Energy  

Science Journals Connector (OSTI)

The total neutron cross section of Xe135 as a function of energy has been remeasured at Oak Ridge National Laboratory under more favorable conditions than obtained in earlier measurements. A sample thickness of 2.5×1018 atoms of Xe135 gas per cm2 was procured from the gases generated in a homogeneous reactor. A mechanical time-of-flight chopper was used to select neutrons in the energy range from 0.01 ev to several thousand ev. The number of Xe135 atoms in the sample was determined by means of mass spectrometer measurements on the long-lived daughter, Cs135. The data of the low-energy resonance were fitted to the single-level Breit-Wigner formula, taking into account Doppler corrections, equally well with the following two sets of parameters: statistical weight factor g=38; resonance energy ?0=0.08472±0.00027 ev; neutron width at energy ?0, ?n0=0.03477±0.00021 ev; capture width, ??=0.083303±0.00062 ev; for g=58, ?0=0.08415±0.00028 ev; ?n0=0.02057±0.00012 ev; ?a=0.09493±0.00071 ev. The errors quoted are the standard deviations derived from the statistics of the measurements. Systematic errors are discussed in the body of the paper. No evidence for resonances at energies greater than 0.085 ev was observed. The results described are interpreted in terms of recent considerations on the statistics of the properties of nuclear energy levels.

E. C. Smith, G. S. Pawlicki, P. E. F. Thurlow, G. W. Parker, W. J. Martin, G. E. Creek, P. M. Lantz, and S. Bernstein

1959-09-15T23:59:59.000Z

135

Probing photoelectron multiple interferences via Fourier spectroscopy in energetic photoionization of Xe-C{sub 60}  

SciTech Connect

Considering the photoionization of the Xe-C{sub 60} endohedral compound, we study in detail the ionization cross sections of various levels of the system at energies higher than the plasmon resonance region. Five classes of single-electron levels are identified depending on their spectral character. Each class engenders distinct oscillations in the cross section, emerging from the interference between active ionization modes specific to that class. Analysis of the cross sections based on their Fourier transforms unravels oscillation frequencies that carry unique fingerprints of the emitting level.

Potter, Andrea; McCune, Matthew A.; De, Ruma; Chakraborty, Himadri S. [Center for Innovation and Entrepreneurship, Department of Chemistry and Physics, Northwest Missouri State University, Maryville, Missouri 64468 (United States); Madjet, Mohamed E. [Institute of Chemistry and Biochemistry, Free University, Fabeckstrasse 36a, D-14195 Berlin (Germany)

2010-09-15T23:59:59.000Z

136

Model for projectile fragmentation: case study for Ni on Ta, Be and Xe on Al  

E-Print Network (OSTI)

For projectile fragmentation we work out details of a model whose origin can be traced back to the Bevalac era. The model positions itself between the phenomenological EPAX parametrization and microscopic transport models like "Heavy Ion Phase Space Exploration Model" (HIPSE) and antisymmetrised molecular dynamics(AMD). We apply the model to some recent data of projectile fragmentation of Ni on Ta and Be at beam energy 140 MeV/nucleon and some older data of Xe on Al at beam energy 790 MeV/nucleon. Reasonable values of cross-sections for various composites populated in the reactions are obtained.

S. Mallik; G. Chaudhuri; S. Das Gupta

2010-12-30T23:59:59.000Z

137

41.8-nm Xe8+ laser driven in a plasma waveguide  

Science Journals Connector (OSTI)

An experimental demonstration of an optical field ionization short-wavelength laser driven in a gas-filled capillary-discharge waveguide is described in detail. Guiding of high-intensity laser pulses has previously been demonstrated with this type of waveguide for capillary discharges in hydrogen. For the present experiments xenon gas was mixed with the hydrogen, and strong lasing on the 4d95d-4d95p transition in Xe8+ at 41.8nm was observed. Under optimum conditions the short-wavelength laser output achieved with the waveguide was found to be greater than that from a Xe gas cell. Measurements of the transmission of the pump laser pulses through the waveguide show that the short-wavelength laser signal was greatest under conditions for which the pump laser pulses were well guided. Simulations of the propagation of the pump laser radiation are presented for a range of initial plasma conditions, and these indicate that the laser-plasma interaction length achieved was greatly increased compared to that which can be achieved in a gas cell.

A. Butler; A. J. Gonsalves; C. M. McKenna; D. J. Spence; S. M. Hooker; S. Sebban; T. Mocek; I. Betttaibi; B. Cros

2004-08-30T23:59:59.000Z

138

Measurement of electron-impact-excitation cross sections and oscillator strengths for Kr  

Science Journals Connector (OSTI)

Differential excitation cross sections have been measured for Kr 4p6(1S0)?4p5(2P1/2,3/2)5s transitions at 300- and 500-eV impact energies and for 1.5°–10° scattering angles by electron-energy-loss spectroscopy. The integrated cross sections for these impact energies are reported here. The generalized oscillator strengths have also been obtained to determine the optical oscillator strengths. The errors are estimated to be less than 15%.

T. Takayanagi; G. P. Li; K. Wakiya; H. Suzuki; T. Ajiro; T. Inaba; S. S. Kano; H. Takuma

1990-06-01T23:59:59.000Z

139

Hyperfine-interaction parameters for a Cd probe atom at the Fe/Kr interface  

Science Journals Connector (OSTI)

Polycrystalline iron foils implanted to high krypton doses, in order to produce rare-gas inclusions, were doped with In111 and the magnetic hyperfine field as well as the electric-field gradient was measured. Time-differential perturbed angular correlation experiments were performed in the as-implanted and the annealed sample condition. We observed a substantial fraction of probe atoms in a ‘‘defect site,’’ characterized by the hyperfine interaction parameters ??Bhf?=-6.89(4)% and Vzz?2.6×1017 V/cm2, in close similarity with those expected for the Kr/Fe interface. The impact of the present approach for metal surface studies is stressed.

P. Decoster; G. De Doncker; M. Rots

1990-04-01T23:59:59.000Z

140

Evidence for a Smooth Onset of Deformation in the Neutron-Rich Kr Isotopes  

Science Journals Connector (OSTI)

The neutron-rich nuclei Kr94,96 were studied via projectile Coulomb excitation at the REX-ISOLDE facility at CERN. Level energies of the first excited 2+ states and their absolute E2 transition strengths to the ground state are determined and discussed in the context of the E(21+) and B(E2;21+?01+) systematics of the krypton chain. Contrary to previously published results no sudden onset of deformation is observed. This experimental result is supported by a new proton-neutron interacting boson model calculation based on the constrained Hartree-Fock-Bogoliubov approach using the microscopic Gogny-D1M energy density functional.

M. Albers et al.

2012-02-10T23:59:59.000Z

Note: This page contains sample records for the topic "uus kr xe" 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.


141

Disappearance of rotational flow and reaction plane dispersions in Kr+Au collisions  

Science Journals Connector (OSTI)

Two-particle azimuthal correlations have been used to extract reaction plane dispersion free triple-differential cross sections for d, t, and ? particles for the midcentral collisions of 84Kr+197Au at E/A=35, 55, and 70 MeV. Both experimental measurements and extrapolations from lower incident energies suggest that rotational flow disappears at E/A?100 MeV for light charged particles and that reaction plane dispersions introduce large uncertainties in extracting the disappearance of rotational flow.

W. Q. Shen; M. B. Tsang; N. Carlin; R. J. Charity; J. Feng; C. K. Gelbke; W. C. Hsi; M. J. Huang; G. J. Kunde; M-C. Lemaire; M. A. Lisa; W. G. Lynch; U. Lynen; Y. G. Ma; G. F. Peaslee; L. Phair; J. Pochodzalla; H. Sann; C. Schwarz; L. G. Sobotka; R. T. de Souza; S. R. Souza; W. Trautmann; C. Williams

1998-03-01T23:59:59.000Z

142

Unusual degree of angular anisotropy in the resonant Auger spectrum of Kr  

Science Journals Connector (OSTI)

The angular distribution parameter, ?, has been measured for the resonant Auger spectra in Kr following 3d?5p excitation. Unusually low values, close to -1, were seen for two bands. From optical spectroscopy data these bands are assigned to the final states 4p4(3P)5p(4P5/2, 4P3/2, and 4D5/2). According to angular momentum transfer theory, some of the transitions could be parity unfavored, yielding ? values of -1, but additional theory is required for a complete understanding. Implications for angular studies of highly resolved Auger spectra are discussed.

Thomas A. Carlson; David R. Mullins; Charles E. Beall; Brian W. Yates; James W. Taylor; Dennis W. Lindle; B. P. Pullen; Frederick A. Grimm

1988-04-04T23:59:59.000Z

143

Number-conserving approach to the pairing problem: Application to Kr and Sn isotopic chains  

Science Journals Connector (OSTI)

The recently proposed symmetry-conserving energy density functional approach [G. Hupin, D. Lacroix, and M. Bender, Phys. Rev. C 84, 014309 (2011)] is applied to perform variation after projection onto the good particle number using the Skyrme interaction, including density-dependent terms. We propose a simplification to reduce the numerical effort to perform the variation. We present a systematic study of the Kr and Sn isotopic chains. This approach leads to nonzero pairing in magic nuclei and a global enhancement of the pairing gap compared to the original theory, which breaks particle number symmetry.

Guillaume Hupin and Denis Lacroix

2012-08-17T23:59:59.000Z

144

Atomic-force-microscopy observations of tracks induced by swift Kr ions in mica  

Science Journals Connector (OSTI)

For the first time, latent tracks induced by swift Kr ions have been directly observed in mica. These tracks are imaged by atomic-force microscopy as hollows which are associated with softer areas in the mica surface. The track core is formed by disordered mica. The mean diameter of the observed hollows increases with the electronic stopping power of the ions. The track shape along the ion path is deduced from the analysis of both the number of the tracks per unit area and their diameter distribution. These observations are the first images of nanometric changes of elastic properties.

F. Thibaudau; J. Cousty; E. Balanzat; S. Bouffard

1991-09-16T23:59:59.000Z

145

Evidence for a highly deformed oblate 0{sup +} state in {sub 36}{sup 74}Kr  

SciTech Connect

We present the observation of an isomeric decay in the very neutron deficient nucleus {sub 36}{sup 74}Kr. The isomer is interpreted as an excited 0{sup +} state, consistent with the long standing prediction of high deformation prolate/oblate shape coexistence in this nucleus. The magnitude of the E0 matrix element deduced for the 0{sub 2}{sup +}{r_arrow}0{sub 1}{sup +} transition gives strong support to the prediction of a highly deformed oblate rotor. {copyright} {ital 1997} {ital The American Physical Society}

Chandler, A.; Regan, P.H.; Pearson, C.J.; Catford, W.N.; Curtis, N.; Gelletly, W.; Vincent, S.M. [Department of Physics, University of Surrey, Guildford, GU2 5XH (United Kingdom)] [Department of Physics, University of Surrey, Guildford, GU2 5XH (United Kingdom); Czajkowski, S.; Janas, Z.; Marchand, C. [CEN Bordeaux-Gradignan, Le Haut-Vigneau, F-33175 Gradignan Cedex (France)] Bruce, A.M. [Cockcroft Building, University of Brighton, Brighton, BN2 4GJ (United Kingdom); Janas, Z.; Lewitowicz, M. [Institute of Experimental Physics, Warsaw University, Pl-00681, Warsaw (Poland)] [Institute of Experimental Physics, Warsaw University, Pl-00681, Warsaw (Poland); Saint-Lauren, M.G.; Winfield, J.S. [GANIL, BP 5027, F-14000, Caen Cedex (France)] Orr, N.A. [LPC, IN2P3-CNRS, ISMRA et Universite de Caen, Bld. du Marechal Juin, F-14050, Caen Cedex (France); Reed, A.T. [Oliver Lodge Laboratory, Department of Physics, University of Liverpool, Liverpool L69 7ZE (United Kingdom)] Petrovici, A. [Institute for Physics and Nuclear Engineering, PO Box MG-6, R-76900 Bucharest-Magurele (Romania)] Wadsworth, R. [Department of Physics, University of York, Heslington, York Y01 4DD (United Kingdom)] Warner, D.D. [CCLRC Daresbury Laboratory, Warrington WA4 4AD (United Kingdom)

1997-12-01T23:59:59.000Z

146

Evidence for a highly deformed oblate 0[sup +] state in [sub 36][sup 74]Kr  

SciTech Connect

We present the observation of an isomeric decay in the very neutron deficient nucleus [sub 36][sup 74]Kr. The isomer is interpreted as an excited 0[sup +] state, consistent with the long standing prediction of high deformation prolate/oblate shape coexistence in this nucleus. The magnitude of the E0 matrix element deduced for the 0[sub 2][sup +][r arrow]0[sub 1][sup +] transition gives strong support to the prediction of a highly deformed oblate rotor. [copyright] [ital 1997] [ital The American Physical Society

Chandler, A.; Regan, P.H.; Pearson, C.J.; Catford, W.N.; Curtis, N.; Gelletly, W.; Vincent, S.M. (Department of Physics, University of Surrey, Guildford, GU2 5XH (United Kingdom)); Czajkowski, S.; Janas, Z.; Marchand, C. (CEN Bordeaux-Gradignan, Le Haut-Vigneau, F-33175 Gradignan Cedex (France)) Bruce, A.M. (Cockcroft Building, University of Brighton, Brighton, BN2 4GJ (United Kingdom)); Janas, Z.; Lewitowicz, M. (Institute of Experimental Physics, Warsaw University, Pl-00681, Warsaw (Poland)); Saint-Lauren, M.G.; Winfield, J.S. (GANIL, BP 5027, F-14000, Caen Cedex (France)) Orr, N.A. (LPC, IN2P3-CNRS, ISMRA et Universite de Caen, Bld. du Marechal Juin, F-14050, Caen Cedex (France)); Reed, A.T. (Oliver Lodge Laboratory, Department of Physics, University of Liverpool, Liverpool L69 7ZE (United Kingdom)) Petrovici, A. (Institute for Physics and Nuclear Engineering, PO Box MG-6, R-76900 Bucharest-Magurele (Romania)) Wadsworth, R. (Department of Physics, University of York, Heslington

1997-12-01T23:59:59.000Z

147

VOLUME 88, NUMBER 11 P H Y S I C A L R E V I E W L E T T E R S 18 MARCH 2002 129Xe-Xe Molecular Spin Relaxation  

E-Print Network (OSTI)

the nuclear spin-rotation interaction [11,16,17] that is also responsible for the NMR frequency shift on the storage time for undiluted room temperature hyperpolar- ized Xe gas. This new relaxation mode must also- tional angular momentum N of the molecule with energy cK R , assumed to dominate over other spin

Walker, Thad G.

148

Remedial investigation/feasibility study work plan for the 100-KR-4 operable unit, Hanford Site, Richland, Washington  

SciTech Connect

Four areas of the Hanford Site (the 100, 200, 300, and 1100 Areas) have been included on the US Environmental Protection Agency`s (EPA`s) National Priorities List (NPL) under the Comprehensive Environmental Response, Compensation, and Liability Act of 1980 (CERCLA). This work plan and the attached supporting project plans establish the operable unit setting and the objectives, procedures, tasks, and schedule for conducting the CERCLA remedial investigation/feasibility study (RI/FS) for the 100-KR-4 operable unit. The 100-K Area consists of the 100-KR-4 groundwater operable unit and three source operable units. The 100-KR-4 operable unit includes all contamination found in the aquifer soils and water beneath the 100-K Area. Source operable units include facilities and unplanned release sites that are potential sources of contamination.

Not Available

1992-09-01T23:59:59.000Z

149

Adsorption of H2O, CO2 and Xe on Soft Surfaces Ori Stein and Micha Asscher*  

E-Print Network (OSTI)

Chemistry and the Farkas Center for Light-Induced Processes, The Hebrew UniVersity of Jerusalem, Israel studies from multilayer coverage grating of Xe on ODT-SAM have demonstrated that sublimation of the chemistry of these small molecules with biologically relevant surfaces such as membranes. In addition

Asscher, Micha

150

Excimer kinetics and multiline model for the electron-beam pumped XeF(B-X) laser  

SciTech Connect

A physical model of the time-, temperature- and wavelength-dependent behavior of an E-beam pumped XeF(B-X) laser is developed. Correlations with published laser- and fluorescence-efficiency data, laser spectra, gain, and absorption data are discussed.

Blauer, J.A.; Yang, T.T.; Turner C.E. Jr.; Copeland, D.A.

1984-12-01T23:59:59.000Z

151

Transport Diffusivities of CH4, CF4, He, Ne, Ar, Xe, and SF6 in Silicalite from Atomistic Simulations  

Science Journals Connector (OSTI)

We have used atomistic simulations to examine the adsorption isotherms, self diffusivity, and transport diffusivity of seven light gases, CH4, CF4, He, Ne, Ar, Xe, and SF6, adsorbed as single-components in silicalite at room temperature. By using ...

Anastasios I. Skoulidas; David S. Sholl

2002-04-23T23:59:59.000Z

152

Observation of Two-Neutrino Double-Beta Decay in [superscript 136]Xe with the EXO-200 Detector  

E-Print Network (OSTI)

We report the observation of two-neutrino double-beta decay in [superscript 136]Xe with T[subscript 1/2]=2.11±0.04(stat)±0.21(syst)×10[superscript 21]??yr. This second-order process, predicted by the standard model, has ...

Waldman, Samuel J.

153

Mutual diffusion in binary Ar-Kr mixtures and empirical diffusion models  

Science Journals Connector (OSTI)

Molecular dynamics simulations of four binary Ar-Kr mixtures are used to compute self- and mutual-diffusion coefficients. Results using mean squared displacements and using velocity correlation functions are presented. The diffusivity coefficients are also presented in the time and frequency domains where a comparatively low frequency structure is evident in some simulations. The computed diffusivities are dependent on the maximum time over which the velocity correlation functions are integrated and the time at which the Einstein relationships are evaluated. This dependence explains in part the small systematic differences between our results (20–80 ps) and earlier molecular dynamics results (<4 ps) in the system Ar-Kr. We compare the computed mutual diffusion coefficients to two empirical models, Darken’s model and the common force model. Darken’s model is consistent with our results over the entire frequency range we resolve. At frequencies lower than about 5 ps-1 Darken’s model and the common force model converge and we cannot discriminate between them. At higher frequencies the common force model prediction is significantly different from the computed mutual diffusion coefficient. Assumptions regarding the contribution of cross correlations that are implicit in the empirical models are discussed and tested against our simulation results. The net contribution of velocity cross correlations is found to be negligible, as is often assumed in deriving Darken’s model, but the individual cross-correlation terms are substantial and negative—a finding contrary to common assumptions. © 1996 The American Physical Society.

Yanhua Zhou and Gregory H. Miller

1996-02-01T23:59:59.000Z

154

XANES of high-pressure Kr clusters in Be and Si  

Science Journals Connector (OSTI)

We report on the experimental investigation of high-pressure Kr clusters in Be and Si single crystals by x-ray absorption near-edge spectroscopy. The samples, obtained by ion implantation, were investigated for several temperatures in the range 83–670 K. We show that the near-edge structure of the absorption spectra is sufficient to obtain valuable quantitative information concerning the contracted lattice parameter of the solid rare gas agglomerates, depending on the overpressure exerted on the clusters by the host matrix. Our data compare to the extended x-ray absorption fine structure (EXAFS) experimental spectra on solid Kr at 4.2 K, and at 300 K under high pressure. Furthermore, in order to check the consistency of our experimental data with EXAFS results taken from the literature, we performed theoretical simulations using the FEFF6 code. These calculations showed good agreement with both sets of data and confirmed our experimental conclusions, permitting the evaluation of the lattice contraction, average coordination, and size of the cluster ensemble.

Giuseppe Faraci; Agata R. Pennisi; Jean-Louis Hazemann

1997-11-15T23:59:59.000Z

155

85Kr management trade-offs: a perspective to total radiation dose commitment  

SciTech Connect

Radiological consequences arising from the trade-offs for /sup 85/Kr waste management from possible nuclear fuel resource recovery activities have been investigated. The reference management technique is to release all the waste gas to the atmosphere where it is diluted and dispersed. A potential alternative is to collect, concentrate, package and submit the gas to long-term storage. This study compares the radiation dose commitment to the public and to the occupationally exposed work force from these alternatives. The results indicate that it makes little difference to the magnitude of the world population dose whether /sup 85/Kr is captured and stored or chronically released to the environment. Further, comparisons of radiation exposures (for the purpose of estimating health effects) at very low dose rates to very large populations with exposures to a small number of occupationally exposed workers who each receive much higher dose rates may be misleading. Finally, cost studies (EPA 1976 and DOE 1979a) show that inordinate amounts of money will be required to lower this already extremely small 80-year cumulative world population dose of 0.05 mrem/person (<0.001% of natural background radiation for the same time period).

Mellinger, P.J.; Hoenes, G.R.; Brackenbush, L.W.; Greenborg, J.

1980-01-01T23:59:59.000Z

156

KrF laser path to high gain ICF (inertial confinement fusion) laboratory microfusion facility  

SciTech Connect

The krypton-fluoride laser has many desirable features for inertial confinement fusion. Because it is a gas laser capable of operation with high efficiency, it is the only known laser candidate capable of meeting the driver requirements for inertial fusion energy (IFE) production. Los Alamos National Laboratory has defined a program plan to develop KrF lasers for IFE production. This plan develops the KrF laser and demonstrates the target performance in single-pulse facilities. A 100-kJ Laser Target Test Facility (LTTF) is proposed as the next step, to be followed by a 3 to 10-MJ Laboratory Microfusion Facility (LMF). The LTTF will resolve many target physics issues and accurately define the driver energy required for the LMF. It is also proposed that the technology development for IFE, such as the high-efficiency, high-reliability, repetitively pulsed driver, the reactor, mass production of targets, and the mechanism of injecting targets be developed in parallel with the single-pulse facilities. 11 refs., 4 figs.

Harris, D.B.; Sullivan, J.A.; Figueiro, J.F.; Cartwright, D.C.; McDonald, T.E.; Hauer, A.A.; Coggeshall, S.V.; Younger, S.M.

1990-01-01T23:59:59.000Z

157

Mixed symmetry states and {beta} decays of odd-A Xe to I isotopes  

SciTech Connect

The energy spectra of the parent and daughter nuclei in the {beta} decays ({sup 121-127}Xe,{beta}{sup +121-127}I) are considered in the interacting boson fermion model (IBFM-2) with the g{sub 7/2},d{sub 5/2},d{sub 3/2},s{sub 1/2}, and h{sub 11/2} single-particle orbitals. Electromagnetic transition probabilities and branching ratios in odd {sup 121-127}I isotopes are investigated. Special attention is given to the occurrence of mixed symmetry states, and the F-spin structures of the wave functions are analyzed. The log{sub 10}ft values of the allowed {beta} decay transitions are calculated. It is found that the IBFM-2 results agree with the experimental data quite well.

Al-Khudair, Falih H. [Department of Physics, Tsinghua University, Beijing 100084 (China); Center of Nuclear Theory, Lanzhou Heavy Ion National Laboratory, Lanzhou, 730000 (China) and Department of Physics, College of Education, Basrah University, Basrah (Iraq)

2009-07-15T23:59:59.000Z

158

Interatomic decay of inner-valence ionized states in ArXe clusters: Relativistic approach  

SciTech Connect

In this work we investigate interatomic electronic decay processes taking place in mixed argon-xenon clusters upon the inner-valence ionization of an argon center. We demonstrate that both interatomic Coulombic decay and electron-transfer mediated decay (ETMD) are important in larger rare gas clusters as opposed to dimers. Calculated secondary electron spectra are shown to depend strongly on the spin-orbit coupling in the final states of the decay as well as the presence of polarizable environment. It follows from our calculations that ETMD is a pure interface process taking place between the argon-xenon layers. The interplay of all these effects is investigated in order to arrive at a suitable physical model for the decay of inner-valence vacancies taking place in mixed ArXe clusters.

Fasshauer, Elke; Pernpointner, Markus; Gokhberg, Kirill [Theoretische Chemie, Universitaet Heidelberg, Im Neuenheimer Feld 229, D-69120 Heidelberg (Germany)

2013-01-07T23:59:59.000Z

159

Copyright(c)2002 by Seoul National University Library. All rights reserved.(http://library.snu.ac.kr)  

E-Print Network (OSTI)

, . . : , , , , version space : 2003-20125 #12;Copyright(c)2002 by Seoul National University Library. All rightsCopyright(c)2002 by Seoul National University Library. All rights reserved.(http://library by Seoul National University Library. All rights reserved.(http://library.snu.ac.kr) Emotional

160

Fluorocarbon impurities in KrF lasers Helen H. Hwang, Kristopher James, Roger Hui, and Mark J. KushneP)  

E-Print Network (OSTI)

. An addition of 0.1% CO was sufficient to extinguish the laser while an addition of the same amount of CF4 amounts of impurities, and flu- orocarbons in particular.' Fluorocarbons such as CF4 are common* with CF4 molecules most often quench Kr* as opposed to resulting in the har- pooning reaction leading

Kushner, Mark

Note: This page contains sample records for the topic "uus kr xe" 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

Chemical accelerator studies of isotope effects on collision dynamics of ion–molecule reactions: Kr++HD  

E-Print Network (OSTI)

The reaction of Kr+ with HD has been studied as a function of relative collision energy over the range 0.08–3.1 eV (c.m.) by measuring integral reaction cross sections and the velocity vector distributions of product ions ...

Chivalak, S.; Hierl, Peter M.

1977-01-01T23:59:59.000Z

162

Difference between zero- and first-sound propagation in solid Kr  

Science Journals Connector (OSTI)

We point out that the zero-sound-first-sound difference in solid rare gases is a very sensitive probe of the phonon self-energy. Recent advances in our knowledge of the interatomic potentials of these solids have enabled us to remove much of the ambiguity from this source and hence focus directly on the influence of different model self-energies. We have investigated the approximations of Koehler and Goldman, Horton, and Klein using a self-consistent harmonic basis with no explicit inclusion of hard-core effects. We find that the previously unexplained experimental result for solid Kr near melting, that C44 as measured by neutron scattering is 12% greater than obtained from Brillouim scattering, lies between the predictions of these two approximations.

V. V. Goldman and Michael L. Klein

1975-11-15T23:59:59.000Z

163

Observation of depinning phenomena in the sliding friction of Kr films on gold  

Science Journals Connector (OSTI)

We have used quartz crystal microbalance to study the sliding friction of atomically thin Kr films adsorbed on gold. We have observed sharp pinning transitions separating a low-coverage region, characterized by slippage at the solid-fluid boundary, from a high-coverage region where the film is locked to the oscillating electrodes. Furthermore, we have induced sliding of a film by slowly increasing the amplitude of the substrate oscillations. Such a depinning transition is characterized by hysteresis as the amplitude is decreased back to zero. These observations have been obtained with two different quartz plates and are similar to those recently reported in the literature. A more quantitative comparison among the different experimental runs indicate that the location of these dynamical transitions is strongly dependent on the state of the substrate surface.

A. Carlin; L. Bruschi; M. Ferrari; G. Mistura

2003-07-25T23:59:59.000Z

164

Nanoscale topographic pattern formation on Kr{sup +}-bombarded germanium surfaces  

SciTech Connect

The nanoscale pattern formation of Ge surfaces uniformly irradiated by Kr{sup +} ions was studied in a low-contamination environment at ion energies of 250 and 500 eV and at angles of 0 Degree-Sign through 80 Degree-Sign . The authors present a phase diagram of domains of pattern formation occurring as these two control parameters are varied. The results are insensitive to ion energy over the range covered by the experiments. Flat surfaces are stable from normal incidence up to an incidence angle of {theta} = 55 Degree-Sign from normal. At higher angles, the surface is linearly unstable to the formation of parallel-mode ripples, in which the wave vector is parallel to the projection of the ion beam on the surface. For {theta} {>=} 75 Degree-Sign the authors observe perpendicular-mode ripples, in which the wave vector is perpendicular to the ion beam. This behavior is qualitatively similar to those of Madi et al. for Ar{sup +}-irradiated Si but is inconsistent with those of Ziberi et al. for Kr{sup +}-irradiated Ge. The existence of a window of stability is qualitatively inconsistent with a theory based on sputter erosion [R. M. Bradley and J. M. Harper, J. Vac. Sci. Technol. A 6, 2390 (1988)] and qualitatively consistent with a model of ion impact-induced mass redistribution [G. Carter and V. Vishnyakov, Phys. Rev. B 54, 17647 (1996)] as well as a crater function theory incorporating both effects [S. A. Norris et al., Nat. Commun. 2, 276 (2011)]. The critical transition angle between stable and rippled surfaces occurs 10 Degree-Sign -15 Degree-Sign above the value of 45 Degree-Sign predicted by the mass redistribution model.

Perkinson, Joy C.; Madi, Charbel S.; Aziz, Michael J. [Harvard School of Engineering and Applied Sciences, 9 Oxford Street, Cambridge, Massachusetts 02138 (United States)

2013-03-15T23:59:59.000Z

165

Cosmiclike domain walls in superfluid B3: Instantons and diabolical points in (k,r) space  

Science Journals Connector (OSTI)

The possible planar superfluid B-B boundaries between inequivalent B-phase vacua are considered; such B-B interfaces provide an analogy with the cosmic domain walls that are believed to have precipitated in the phase transitions of the early Universe. Several of them display nontrivial structure in (k,r) space (i.e., the union of the momentum and real spaces). Such a wall represents an instanton connecting two B-phase vacua with different k-space topology. The transition between the vacua occurs through the formation of a pointlike defect either in the (k,r) space, or in the (k,t) space. These defects are so-called diabolical points of codimension 4, at which the fermionic energy tends to zero, thus providing the fermionic zero modes. Such points are new examples (within condensed-matter physics) of the peculiar diabolical points, which are characterized by the occurrence of a contact between the different branches of the quasiparticle spectra; in the present case, the branches of particles and holes, respectively. These points are here discussed for the case of the superfluid phases of liquid He3 in close analogy with the quantum field theory of fermions interacting with classical bosonic fields. The cosmiclike domain walls in superfluid B3 are observable in principle; in particular, the motion of the superfluid A-B interface is governed at low temperatures by the periodical emission of these topological excitation planes. The edges of B-B interfaces serve to generate fractionally quantized pure and mixed mass and spin supercurrent vortices in B3, while holes in these surfaces may give rise to the corresponding vortex rings and combined vortex and/or spin-disclination rings.

M. M. Salomaa and G. E. Volovik

1988-06-01T23:59:59.000Z

166

Shell model description of N=81 five-exciton Xe135 and the decay of I135  

Science Journals Connector (OSTI)

We have measured the spectrum of ? rays following the decay of 6.55±0.03-h I135 to levels of Xe135. These ??-coincidence measurements have enabled us to construct a level scheme with 31 levels below 2700 keV and make a number of spin and parity assignments. The levels and their deexcitation properties are used to test a large-scale shell model calculation. In general, good agreement is found for this limiting case of the large-scale shell model code. Precise energy values and absolute intensities for the ? rays were determined for use in reactor effluent metrology.NUCLEAR STRUCTURE Shell model calculations five exciton test case.RADIOACTIVITY I135 fission product, radiochemical separation. Determined t12, E?, and I?. Xe135 deduced levels and J? values.

W. B. Walters; S. M. Lane; N. L. Smith; R. J. Nagle; R. A. Meyer

1982-11-01T23:59:59.000Z

167

RtS>-l-2437 Utilization of the Isotoplc Composition of  

E-Print Network (OSTI)

131+Xe132. This conversion is of importance in the calculation of the total Xe generation duringRtS«>-l»-2437 3*- if, -. Utilization of the Isotoplc Composition of Xe and Kr in Fission Gas 4* #12;RIS�-M-2437 UTILIZATION OF THE ISOTOPIC COMPOSITION OF Xe AND Kr IN FISSION GAS RELEASE

168

New Coordination Compounds of Cd(AsF6)2 with HF and XeF2  

Science Journals Connector (OSTI)

New Coordination Compounds of Cd(AsF6)2 with HF and XeF2 ... The total fluoride content (Ftotal-) was determined after complete decomposition of the sample by fusion with KNaCO3. ... Raman spectra of the powdered samples in sealed quartz capillaries were recorded on a Renishaw Raman Imaging Microscope System 1000 by use of the 632.8 nm exciting line of a He?Ne laser. ...

Gašper Tav?ar; Primož Benki?; Boris Žemva

2004-01-21T23:59:59.000Z

169

Experimental characterization of a self-filtering unstable resonator applied to a short pulse XeCl laser  

SciTech Connect

A self-filtering unstable resonator with magnification ZMZ = 5 has beenapplied to a pulsed UV-preionized XeCl excimer laser. In agreement withnumerical results it is experimentally shown that less than two cavity roundtrips are needed to establish a steady state lowest-order mode. Adiffraction-limited laser beam with a brightness of 1.5 /times/ 10/sup 13/ Wcm/sup /minus/2/ Sr/sup /minus/1/ has been obtained.

Luches, A.; Nassisi, V.; Perrone, M. R.

1989-06-01T23:59:59.000Z

170

Investigation of the Platinum Cluster Size and Location on Zeolite KL with 129Xe NMR, XAFS, and Xenon Adsorption  

Science Journals Connector (OSTI)

Investigation of the Platinum Cluster Size and Location on Zeolite KL with 129Xe NMR, XAFS, and Xenon Adsorption ... Figure 4 k3?(k)-weighted EXAFS oscillation for Pt/KL samples and the Fourier transform in r-space:? (a,d) 2.0 wt % Pt/KL; (b,e) 3.4 wt % Pt/KL; (c,f) 5.2 wt % Pt/KL. ...

Sung June Cho; Wha-Seung Ahn; Suk Bong Hong; Ryong Ryoo

1996-03-21T23:59:59.000Z

171

Demonstration of a 10-Hz Femtosecond-Pulse-Driven XUV Laser at 41.8 nm in Xe IX  

Science Journals Connector (OSTI)

We report the observation of a gain of approximately exp11 at 41.8 nm in 8-times-ionized xenon. This extreme ultraviolet (XUV) laser is driven by a 10-Hz, 70-mJ circularly polarized femtosecond laser pulse. The laser is focused into Xe at pressures ranging from 5 to 12 torr. The laser is collisionally excited, with both the ions and electrons produced by field induced tunneling.

B. E. Lemoff; G. Y. Yin; C. L. Gordon III; C. P. J. Barty; S. E. Harris

1995-02-27T23:59:59.000Z

172

Gamma-gamma directional correlation measurements in 130,132Xe following thermal neutron capture by natural xenon  

Science Journals Connector (OSTI)

Directional correlations of gamma-ray cascades in 130,132Xe have been measured following thermal n capture by a pressurised natural xenon gas target. Gamma-ray singles spectra were measured up to 5.5 MeV and the coincidence correlation data were obtained for the energy range 0.2-2.5 MeV. Decay schemes were developed on the basis of the coincidence measurements. The data spin-parity assignments to be made to most levels lying below 3.5 MeV in the 132Xe and the multiple mixing ratios to be evaluated for the more intense transitions. The results are fitted to IBM-1 and IBM-2 and are also compared with the prediction of the dynamic deformation model of Kumar (1983). The 23+ level at 1985 keV in 132Xe is considered to be a mixed-symmetry state with B(M1; 23+ to 21+)=0.29 mu N2.

S A Hamada; W D Hamilton; B More

1988-01-01T23:59:59.000Z

173

Status of double beta decay experiments using isotopes other than Xe-136  

E-Print Network (OSTI)

Neutrinoless double beta decay is a lepton-number violating process predicted by many extensions of the standard model. It is actively searched for in several candidate isotopes within many experimental projects. The status of the experimental initiatives which are looking for the neutrinoless double beta decay in isotopes other than Xe-136 is reviewed, with special emphasis given to the projects that passed the R&D phase. The results recently released by the experiment GERDA are also summarized and discussed. The GERDA data give no positive indication of neutrinoless double beta decay of Ge-76 and disfavor in a model-independent way the long-standing observation claim on the same isotope. The lower limit reported by GERDA for the half-life of neutrinoless double beta decay of Ge-76 is T1/2 > 2.1e25 yr (90% C.L.), or T1/2 > 3.0e25 yr, when combined with the results of other Ge-76 predecessor experiments.

Pandola, Luciano

2014-01-01T23:59:59.000Z

174

Operational air pollution prediction and doses calculation in case of nuclear emergency at Krško Nuclear Power Plant  

Science Journals Connector (OSTI)

The paper presents fully operational air pollution prediction and doses calculation system working in 2/24/7/365 mode for more than a decade in Krško Nuclear Power Plant (NPP). Krško NPP lies in complex terrain in Slovenia very close to Croatia border. A dedicated software is available for detailed estimation of possible radioactive emission (source term). This part of the procedure is used by trained NPP operators and then automatically coupled with dilution coefficients to obtain radionuclide air pollution concentrations. As radioactive material causes dose also with distant cloud shine not only by direct touch or inhalation, special procedure is implemented for dose estimation. We present in detail our algorithm for distant cloud shine estimation based on dilution coefficients calculation. The paper concludes by stressing the importance of correct air pollution prediction with best possible modelling techniques where achieving time and space accurate modelling is required for proper population protection.

Primož Mlakar; Marija Zlata Božnar; Borut Breznik

2014-01-01T23:59:59.000Z

175

Influence of Kr doping on neon soft X-rays emission in fast miniature plasma focus device  

Science Journals Connector (OSTI)

Abstract An investigation on the possibility of enhancement of soft X-ray (SXR) (900–1600 eV) emission from a fast miniature plasma focus (FMPF) device of 235 J (at 14 kV) storage energy through doping of operating gas was performed. Neon (Ne), the operating gaseous medium, was doped with krypton (Kr) in different volumetric ratios at various operating pressures ranging from 2 to 14 mbar. The 1% Kr doping increased the average optimum SXR emission efficiency from 0.47% to 0.6% without enhancing the hard X-ray (HXR) (>1600 eV) emission. The Kr doping influenced the major pinching characteristics such as focusing efficiency and time to pinch with consequential effect on X-ray emissions. Synchronous operation of the 4 pseudo-spark gap (PSG) switches was mandatory for efficient discharge current delivery to the electrodes. A drastic improvement in the pinching efficiency was obtained with replacement of old and worn out PSG switches with the new ones. Optical imaging of current sheath dynamics was performed using gated ICCD camera to verify the normal operation of the device after the \\{PSGs\\} replacement. A numerical simulation analysis on the 2 cm long stainless steel tapered anode, used in this study, was done to predict the maximum SXR emission efficiency and the peak operating gas pressure. An analysis on the amount of SXR fluence generated at the source position and the proportion of it reaching the target position is also reported.

S.M.P. Kalaiselvi; T.L. Tan; A. Talebitaher; P. Lee; R.S. Rawat

2014-01-01T23:59:59.000Z

176

Structural and elastic properties of Ge after Kr-ion irradiation at room temperature  

Science Journals Connector (OSTI)

Changes in the elastic properties of Ge induced by room-temperature irradiation with 3.5-MeV Kr ions have been determined and correlated with changes in the microstructure determined by transmission electron microscopy. Elastic-shear-moduli changes were measured by Brillouin scattering, and changes in local atomic arrangement were determined by Raman scattering. Amorphization decreased the elastic shear modulus of Ge by 17%. The fractional decrease was correlated with the amorphous volume fraction with a cross section of 4.5±0.5 nm2/ion. No change was observed in the shear modulus during void formation and growth. The elastic properties of the voided material are described by the Voigt averaging. However, as the voids evolved into a fibrous spongelike microstructure, a second dramatic elastic softening occurs which we attribute to the inability of the fibrous structure to support shear stresses. Raman scattering showed that, once formed, there was no change in the structure of the amorphous material at the atomic scale during void formation and subsequent void coalescence.

R. C. Birtcher; M. H. Grimsditch; L. E. McNeil

1994-10-01T23:59:59.000Z

177

Ionization-induced blue shift of KrF laser pulses in an underdense plasma  

Science Journals Connector (OSTI)

The ionization-induced blue-shifted spectra for helium, neon, and nitrogen have been measured at various gas densities up to 5×1020 cm-3 at a vacuum intensity of 8×1016 W/cm2 for picosecond KrF laser pulses at 248 nm. A 1-mm diameter gas jet target was used in the experiment to minimize the refraction of the laser beam and thus higher laser intensities were obtained in the gas than in previously reported experiments. For helium, a distinct shifted peak was observed at intermediate densities which was not seen before. For helium and nitrogen, spectra were also measured of the light scattered outside of the original focal cone angle. In this region there was little signal for electron densities below 2×1020 cm-3 consistent with limited refraction at lower densities and at higher densities the spectra were predominantly blue shifted. These results indicate the importance of refraction in the correct interpretation of ionization blue-shifted spectra. © 1996 The American Physical Society.

Y. M. Li and R. Fedosejevs

1996-08-01T23:59:59.000Z

178

Surface instability on a metal target from multi-pulse KrF laser ablation  

SciTech Connect

Aluminum targets were ablated by focusing a KrF excimer laser down to a spot size of 0.05 cm{sup 2} with a fluence of approximately 4.9 J/cm{sup 2}. After a few tens of pulses, surface irregularities (corrugations and pits) progressively emerge, with size 1--100 {micro}m which is much larger than the laser wavelength. After hundreds of laser pulses, large scale wavelike patterns, on the order of 20 {micro}m, are observed on the aluminum surface. The authors propose that these wave patterns are caused by the Kelvin-Helmholtz instability at the interface of the molten aluminum and the plasma plume. A parametric study is given in terms of the molten layer`s thickness and of the spatial extent and kinetic energy density in the laser-produced plasma plume. Also included is an estimate of the cumulative growth in a multi-pulse laser ablation experiment. These estimates indicate that the Kelvin-Helmholtz instability is a viable mechanism for the formation of the large scale structures. Once formed, these large scale surface roughness causes multiple reflections of the laser light, and may increase the absorption coefficient over a pristine, flat surface by an order of magnitude.

Ang, L.K.; Lau, Y.Y.; Gilgenbach, R.M.; Kovaleski, S.D. [Univ. of Michigan, Ann Arbor, MI (United States); Spindler, H.L. [Boeing Corp., Seattle, WA (United States); Lash, J.S. [Sandia National Lab., Albuquerque, NM (United States)

1998-12-31T23:59:59.000Z

179

A novel PPAR{gamma} agonist, KR62776, suppresses RANKL-induced osteoclast differentiation and activity by inhibiting MAP kinase pathways  

SciTech Connect

We investigated the effects of a novel peroxisome proliferator-activated receptor {gamma} (PPAR{gamma}) agonist, KR62776, on osteoclast differentiation and function, and on the underlying signaling pathways. KR62776 markedly suppressed differentiation into osteoclasts in various osteoclast model systems, including bone marrow mononuclear (BMM) cells and a co-culture of calvarial osteoblasts and BMM cells. KR62776 suppressed the activation of tartrate-resistant acid phosphatase (TRAP) and the expression of genes associated with osteoclast differentiation, such as TRAP, dendritic cell-specific transmembrane protein (DC-STAMP), and osteoclast-associated receptor (OSCAR). Furthermore, KR62776 reduced resorption pit formation in osteoclasts, and down-regulated genes essential for osteoclast activity, such as Src and {alpha}v{beta}3 integrin. An analysis of a signaling pathway showed that KR62776 inhibited the receptor activator of nuclear factor-{kappa}B ligand (RANKL)-induced activation of p38 mitogen-activated protein kinase (p38MAPK), extracellular regulated kinase (ERK), c-Jun N-terminal kinase (JNK) and nuclear factor-{kappa}B (NF-{kappa}B). Together, these results demonstrate that KR62776 negatively affects osteoclast differentiation and activity by inhibiting the RANKL-induced activation of MAP kinases and NF-{kappa}B.

Park, Ju-Young [Skeletal Diseases Genome Research Center, Kyungpook National University Hospital, Daegu (Korea, Republic of); Department of Biochemistry, School of Medicine, Kyungpook National University, Daegu (Korea, Republic of); Bae, Myung-Ae; Cheon, Hyae Gyeong; Kim, Sung Soo [Center for Metabolic Syndrome Therapeutics, Korea Research Institute of Chemical Technology, Daejeon (Korea, Republic of); Hong, Jung-Min; Kim, Tae-Ho [Skeletal Diseases Genome Research Center, Kyungpook National University Hospital, Daegu (Korea, Republic of); Choi, Je-Yong [Skeletal Diseases Genome Research Center, Kyungpook National University Hospital, Daegu (Korea, Republic of); Department of Biochemistry, School of Medicine, Kyungpook National University, Daegu (Korea, Republic of); Kim, Sang-Hyun [Department of Pharmacology, School of Medicine, Kyungpook National University, Daegu (Korea, Republic of); Lim, Jiwon [Department of Oral Pathology, IHBR, School of Dentistry, Kyungpook National University, Daegu (Korea, Republic of); Choi, Chang-Hyuk [Department of Orthopaedic Surgery, School of Medicine, Catholic University of Daegu, Daegu (Korea, Republic of); Shin, Hong-In [Department of Oral Pathology, IHBR, School of Dentistry, Kyungpook National University, Daegu (Korea, Republic of); Kim, Shin-Yoon [Skeletal Diseases Genome Research Center, Kyungpook National University Hospital, Daegu (Korea, Republic of); Department of Orthopaedic Surgery, School of Medicine, Kyungpook National University, Daegu (Korea, Republic of)], E-mail: syukim@knu.ac.kr; Park, Eui Kyun [Skeletal Diseases Genome Research Center, Kyungpook National University Hospital, Daegu (Korea, Republic of); Department of Oral Pathology, IHBR, School of Dentistry, Kyungpook National University, Daegu (Korea, Republic of)], E-mail: epark@knu.ac.kr

2009-01-16T23:59:59.000Z

180

Compatibility of Space Nuclear Power Plant Materials in an Inert He/Xe Working Gas Containing Reactive Impurities  

SciTech Connect

A major materials selection and qualification issue identified in the Space Materials Plan is the potential for creating materials compatibility problems by combining dissimilar reactor core, Brayton Unit and other power conversion plant materials in a recirculating, inert He/Xe gas loop containing reactive impurity gases. Reported here are results of equilibrium thermochemical analyses that address the compatibility of space nuclear power plant (SNPP) materials in high temperature impure He gas environments. These studies provide early information regarding the constraints that exist for SNPP materials selection and provide guidance for establishing test objectives and environments for SNPP materials qualification testing.

MM Hall

2006-01-31T23:59:59.000Z

Note: This page contains sample records for the topic "uus kr xe" from the National Library of EnergyBeta (NLEBeta).
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181

Direct Information on Structure and Energetic Features of Cu+?Xe Species Formed in MFI-Type Zeolite at Room Temperature  

Science Journals Connector (OSTI)

Recently, xenon chemistry has shown itself to be significant and interesting from the viewpoint of the “missing xenon” phenomenon(4-6) and also from the challenging tasks connected to both organic Xe compounds(7, 8) and simple inorganic Xe compounds(9-12) that form the basis of new and efficient materials for the industrial extraction of xenon from air. ... Figure 2. Fourier transforms of the EXAFS oscillations at the Cu K-edge of a CuMFI-112 sample under various conditions. ...

Hiroe Torigoe; Toshinori Mori; Kazuhiko Fujie; Takahiro Ohkubo; Atsushi Itadani; Kazuma Gotoh; Hiroyuki Ishida; Hiroki Yamashita; Takashi Yumura; Hisayoshi Kobayashi; Yasushige Kuroda

2010-08-26T23:59:59.000Z

182

Vacuum ultra-violet emission of plasma discharges with high Xe partial pressure using a cathode protective layer with high secondary electron emission  

SciTech Connect

In this work, the mechanism of the vacuum ultra-violet (VUV) emission of plasma discharges, with high Xe partial pressure and high ion-induced secondary electrons emission protective layer, is studied by measuring the VUV light emission directly and comparing it with two-dimensional simulations. From the panel measurement, we find that the high intensity of excimer VUV mainly contributes to the high luminous efficacy of SrCaO-plasma display panels (PDP) at a low sustain voltage. The unchanged Xe excitation efficiency indicates that the electron temperature is not decreased by the high secondary electrons emission protective layer, even though the sustain voltage is much lower. From the two-dimensional simulations, we can find that the ratio of excimer VUV to resonant VUV, which is determined by the collision rate in the discharge, is only significantly affected by the Xe partial pressure, while it is independent of the sustain voltage and the secondary-electrons-emission capability of protective layer. The unchanged average electron energy at the moment when the electric field becomes maximum confirms that the improvement of the VUV production efficiency mainly is attributed to the increase in electron heating efficiency of a PDP with high ion-induced secondary electrons emission protective layer. Combining the experimental and the simulation results, we conclude about the mechanism by which the VUV production is improved for the plasma display panel with a high Xe partial pressure and a cold cathode with high ion-induced secondary electrons emission.

Zhu, Di [School of Electronics and Information Engineering, Tianjin Polytechnic University, Tianjin (China); Song, Le, E-mail: songle@tju.edu.cn [State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin (China); Zhang, Xiong [School of Electronic Science and Engineering, Southeast University, Nanjing (China); Kajiyama, Hiroshi [Graduate School of Advanced Science of Matter, Hiroshima University, Higashi-hiroshima, Hiroshima (Japan)

2014-02-14T23:59:59.000Z

183

Ion-radical synergy in HfO{sub 2} etching studied with a XeF{sub 2}/Ar{sup +} beam setup  

SciTech Connect

To gain more insight into fundamental aspects of the etching behavior of Hf-based high-k materials in plasma etch reactors, HfO{sub 2} films were etched in a multiple-beam setup consisting of a low energy Ar{sup +} ion beam and a XeF{sub 2} radical beam. The etch rate and etch products were monitored by real-time ellipsometry and mass spectrometry, respectively. Although etching of HfO{sub 2} in XeF{sub 2}/Ar{sup +} chemistry is mainly a physical effect, an unambiguous proof of the ion-radical synergistic effect for the etching of HfO{sub 2} is presented. The etch yield for 400 eV Ar{sup +} ions at a substrate temperature of 300 deg. C was 0.3 atoms/ion for Ar{sup +} sputtering and increased to 2 atoms/ion when XeF{sub 2} was also supplied. The etch yield proved to follow the common square root of ion energy dependence both for pure sputtering and radical enhanced etching, with a threshold energy at room temperature of 69{+-}17 eV for Ar{sup +} ions and 54{+-}14 eV for Ar{sup +} ions with XeF{sub 2}.

Gevers, P. M.; Beijerinck, H. C. W.; Sanden, M. C. M. van de; Kessels, W. M. M. [Department of Applied Physics, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven (Netherlands)

2008-04-15T23:59:59.000Z

184

Limit on Neutrinoless ?? Decay of Xe-136 from the First Phase of KamLAND-Zen and Comparison with the Positive Claim in Ge-76  

E-Print Network (OSTI)

We present results from the first phase of the KamLAND-Zen double-beta decay experiment, corresponding to an exposure of 89.5 kg yr of Xe-136. We obtain a lower limit for the neutrinoless double-beta decay half-life of T_{1/2}^{0{\

KamLAND-Zen Collaboration

2012-11-16T23:59:59.000Z

185

Can xenon in water inhibit ice growth? Molecular dynamics of phase transitions in water$-$Xe system  

E-Print Network (OSTI)

Motivated by recent experiments showing the promise of noble gases as cryoprotectants, we perform molecular dynamics modeling of phase transitions in water with xenon under cooling. We study the structure and dynamics of xenon water solution as a function of temperature. Homogeneous nucleation of clathrate hydrate phase is observed and characterized. As the temperature is further reduced we observe hints of dissociation of clathrate due to stronger hydrophobic hydration, pointing towards a possible instability of clathrate at cryogenic temperatures and conversion to an amorphous phase comprised of "xenon + hydration shell" Xe$\\cdot$(H$_{2}$O)$_{21.5}$ clusters. Simulations of ice$-$xenon solution interface in equilibrium and during ice growth reveal the effects of xenon on the ice$-$liquid interface, where adsorbed xenon causes roughening of ice surface but does not preferentially form clathrate. These results provide evidence against the ice-blocker mechanism of xenon cryoprotection.

Vasilii I. Artyukhov; Alexander Yu. Pulver; Alex Peregudov; Igor Artyuhov

2014-07-11T23:59:59.000Z

186

ELSEVIER Journal of Nuclear Materials 244 (1997) 295-304 The formation of bubbles in Zr alloys under Kr ion irradiation  

E-Print Network (OSTI)

ELSEVIER Journal of Nuclear Materials 244 (1997) 295-304 The formation of bubbles in Zr alloys under Kr ion irradiation L. Pagano Jr. a, A.T. Motta a,,, R.C. Birtcher b a Department of Nuclear,ision, Argonne National Laborato~', Argonne, IL 60439, USA Received 24 May 1996; accepted 26 November 1996

Motta, Arthur T.

187

Annual Summary Report Calendar Year 2000 for the 100-HR-3, 100-KR-4, and 100-NR-2 Operable Units and Pump-and-Treat Operations  

SciTech Connect

This annual progress and performance evaluation report discusses the groundwater remedial actions in the 100 Area, including the interim actions at the 100-HR-3 and 100-KR-4 Operable Units, and also discusses the expedited response action in the 100-NR-2 operable unit.

G. B. Mitchem

2001-08-22T23:59:59.000Z

188

Temperature and Scaling Studies from Projectile Fragmentation of 86,78Kr+64,58Ni at 35 MeV/A.  

E-Print Network (OSTI)

equation of state. Projectile fragmentation sources were identified from the reactions of 86,78Kr+64,58Ni at 35 MeV/A taken on the NIMROD-ISiS array. The angular coverage, excellent isotopic resolution, and Neutron Ball allow for quasi-complete event...

Wuenschel, Sara K.

2010-01-14T23:59:59.000Z

189

Time-resolved coherent anti-Stokes Raman-scattering measurements of I2 in solid Kr: Vibrational dephasing on the ground electronic state  

E-Print Network (OSTI)

Time-resolved coherent anti-Stokes Raman-scattering measurements of I2 in solid Kr: Vibrational; published online 18 August 2005 Time-resolved coherent anti-Stokes Raman-scattering CARS measurements are carried out for iodine I2 in solid krypton matrices. The dependence of vibrational dephasing time

Apkarian, V. Ara

190

Investigation of the effects of LIFT printing with a KrF-excimer laser on thermally sensitive electrically conductive adhesives  

Science Journals Connector (OSTI)

Laser induced forward transfer is an emerging material deposition technology. We investigated the feasibility of this technique for printing thermally sensitive, electrically conductive adhesives with and without using an intermediate dynamic release layer. A 248 nm KrF-excimer laser was used to print the epoxy-based conductive adhesives containing silver flakes down to 75 ?m dot size. The process is particularly relevant for realizing electrical connections to surface mount devices in the microelectronics industry. Characterization of the printed materials was analyzed by Fourier transform infrared spectroscopy, four-point electrical measurements, die-shear testing and temperature shock testing, to establish that the properties of the adhesive were not affected by direct or indirect laser irradiation. The lack of degradation by the laser onto the adhesives confirms the potential of this technique for interconnection applications.

S M Perinchery; E C P Smits; A Sridhar; P Albert; J van den Brand; R Mandamparambil; I Yakimets; H F M Schoo

2014-01-01T23:59:59.000Z

191

Two source emission behavior of projectile fragments alpha in 84^Kr interactions at around 1 GeV per nucleon  

E-Print Network (OSTI)

The emission of projectile fragments alpha has been studied in 84^Kr interactions with nuclei of the nuclear emulsion detector composition at relativistic energy below 2 GeV per nucleon. The angular distribution of projectile fragments alpha in terms of transverse momentum could not be explained by a straight and clean-cut collision geometry hypothesis of Participant - Spectator (PS) Model. Therefore, it is assumed that projectile fragments alpha were produced from two separate sources that belong to the projectile spectator region differing drastically in their temperatures. It has been clearly observed that the emission of projectile fragments alpha are from two different sources. The contribution of projectile fragments alpha from contact layer or hot source is a few percent of the total emission of projectile fragments alphas. Most of the projectile fragments alphas are emitted from the cold source.

M. K. Singh; Ramji Pathak; V. Singh

2010-08-12T23:59:59.000Z

192

First Results of a Search for the Two-Neutrino Double-Beta Decay of {sup 136}Xe with High-Pressure Copper Proportional Counters  

SciTech Connect

A description of a low-background installation for a new stage of the experimental search for the 2{beta}(2{nu}) decay of {sup 136}Xe with high-pressure copper proportional counters is presented. The first estimate of the decay half-life limit based on the data measured over 4140 h yields T{sub 1/2} {>=} 2.4 x 10{sup 21} yr (90% C.L.)

Gavriljuk, Yu.M.; Gangapshev, A.M.; Kuzminov, V.V.; Osetrova, N.Ya. [Baksan Neutrino Observatory, Institute for Nuclear Research, Russian Academy of Sciences (Russian Federation); Panasenko, S.I.; Ratkevich, S.S. [Kharkov National University, Kharkov (Ukraine)

2004-11-01T23:59:59.000Z

193

Preparation of binderless nanopore-isotropic graphite for inhibiting the liquid fluoride salt and Xe135 penetration for molten salt nuclear reactor  

Science Journals Connector (OSTI)

Abstract Mesocarbon microbeads and the isostatic pressing method were used to prepare binderless nanopore-isotropic graphite (NPIG) as a neutron moderator and reflector, to inhibit liquid fluoride salt and Xe135 penetration during use in a molten salt nuclear reactor. The microstructure, thermophysical, and other properties of the NPIG were studied and compared with isostatic graphite (IG-110, TOYO TANSO CO., Ltd., Japan). A high-pressure reactor and a vacuum device were constructed to evaluate the molten salt and Xe135 penetration in the graphite, respectively. The results indicated that NPIG possessed a graphitization degree of 74% and excellent properties such as a high bending strength of 94.1 ± 2.5 MPa, a high compressive strength of 230 ± 3 MPa, a low porosity of 8.7%, and an average pore diameter of 69 nm. The fluoride salt occupation of IG-110 was 13.5 wt% under 1.5 atm, whereas the salt gain in NPIG remained steady even up to 10 atm with an increase of <0.06 wt%, demonstrating that the graphite could inhibit the liquid fluoride salt infiltration effectively. The helium diffusion coefficient for NPIG was 8.76 × 10?5 cm2/s, much less than 1.21 × 10?2 cm2/s for IG-110. The NPIG could effectively inhibit liquid fluoride salt and Xe135 penetration.

Jinliang Song; Yanling Zhao; Junpeng Zhang; Xiujie He; Baoliang Zhang; Pengfei Lian; Zhanjun Liu; Dongsheng Zhang; Zhoutong He; Lina Gao; Huihao Xia; Xingtai Zhou; Ping Huai; Quangui Guo; Lang Liu

2014-01-01T23:59:59.000Z

194

Levels of Rb93, Sr93, and Y93 fed in the decays of Kr93, Rb93, and Sr93  

Science Journals Connector (OSTI)

The ? rays and conversion electrons following the ?- decay of Kr93, Rb93, and Sr93 have been measured by applying on-line mass-separation techniques to U235 fission products. Level schemes for the three daughter nuclei are proposed based on the study of ?-singles, ??-coincidence, and internal-conversion electron spectra. Internal-conversion coefficients were determined for 10 transitions and the deduced multipolarities as well as logft values were combined with known reaction results to assign spins and parities. The half-life for the 758.63-KeV isomeric level in Y93 was measured to be 85 ± 15 msec.RADIOACTIVITY Kr93, Rb93, Sr93; measured E?, I?, ?? coin, ICC; deduced logft, ?. Ym93; measured T12. Rb93, Sr93, Y93; deduced levels, J, ?. On-line measurement, mass-separated U235 fission products.

E. Achterberg; F. C. Iglesias; A. E. Jech; J. A. Moragues; D. Otero; M. L. Pérez; A. N. Proto; J. J. Rossi; W. Scheuer

1974-12-01T23:59:59.000Z

195

d-alpha Correlation functions and collective motion in Xe+Au collisions at E/A=50 MeV  

E-Print Network (OSTI)

The interplay of the effects of geometry and collective motion on d-$\\alpha$ correlation functions is investigated for central Xe+Au collisions at E/A=50 MeV. The data cannot be explained without collective motion, which could be partly along the beam axis. A semi-quantitative description of the data can be obtained using a Monte-Carlo model, where thermal emission is superimposed on collective motion. Both the emission volume and the competition between the thermal and collective motion influence significantly the shape of the correlation function, motivating new strategies for extending intensity interferometry studies to massive particles.

G. Verde; P. Danielewicz; W. G. Lynch; C. F. Chan; C. K. Gelbke; K. K. Lau; T. X. Liu; X. D. Liu; D. Seymour; R. Shomin; W. P. Tan; M. B. Tsang; A. Wagner; H. S. Xu; D. A. Brown; Y. Larochelle; R. T. de Souza; R. Yanez; R. J. Charity; L. G. Sobotka

2007-08-01T23:59:59.000Z

196

d-alpha correlation functions and collective motion in Xe+Au collisions at E/A=50 MeV  

SciTech Connect

The interplay of the effects of geometry and collective motion on d-{alpha} correlation functions is investigated for central Xe+Au collisions at E/A=50 MeV. The data cannot be explained with out collective motion, which could be partly along the beam axis. A semi-quantitative description of the data can be obtained using a Monte -Carlo model, where thermal emission is superimposed on collective motion. Both the emission volume and the competition between the thermal and collective motion influence significantly the shape of the correlation function, motivating new strategies for extending intensity interferometry studies to massive particles.

Verde, G; Danielewicz, P; Lynch, W; Chan, C; Gelbke, C; Kwong, L; Liu, T; Liu, X; Seymour, D; Tan, W; Tsang, M; Wagner, A; Xu, H; Brown, D; Davin, B; Larochelle, Y; de Souza, R; Charity, R; Sobotka, L

2006-07-27T23:59:59.000Z

197

Development of a Silicon Based Electron Beam Transmission Window for Use in a KrF Excimer Laser System  

SciTech Connect

The Princeton Plasma Physics Laboratory (PPPL), in collaboration with the Naval Research Laboratory (NRL), is currently investigating various novel materials (single crystal silicon, <100>, <110> and <111>) for use as electron-beam transmission windows in a KrF excimer laser system. The primary function of the window is to isolate the active medium (excimer gas) from the excitation mechanism (field-emission diodes). Chosen window geometry must accommodate electron energy transfer greater than 80% (750 keV), while maintaining structural integrity during mechanical load (1.3 to 2.0 atm base pressure differential, approximate 0.5 atm cyclic pressure amplitude, 5 Hz repetition rate) and thermal load across the entire hibachi area (approximate 0.9 W {center_dot} cm superscript ''-2''). In addition, the window must be chemically resistant to attack by fluorine free-radicals (hydrofluoric acid, secondary). In accordance with these structural, functional, and operational parameters, a 22.4 mm square silicon prototype window, coated with 500 nm thin-film silicon nitride (Si{sub 3}N{sub 4}), has been fabricated. The window consists of 81 square panes with a thickness of 0.019 mm {+-} 0.001 mm. Stiffened (orthogonal) sections are 0.065 mm in width and 0.500 mm thick (approximate). Appended drawing (Figure 1) depicts the window configuration. Assessment of silicon (and silicon nitride) material properties and CAD modeling and analysis of the window design suggest that silicon may be a viable solution to inherent parameters and constraints.

C.A. Gentile; H.M. Fan; J.W. Hartfield; R.J. Hawryluk; F. Hegeler; P.J. Heitzenroeder; C.H. Jun; L.P. Ku; P.H. LaMarche; M.C. Myers; J.J. Parker; R.F. Parsells; M. Payen; S. Raftopoulos; J.D. Sethian

2002-11-21T23:59:59.000Z

198

The Periodic Table of Elements C  

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

Atomic Number Chemical Symbol Atomic Weight Chemical Name = Solid at room temperature = Liquid at room temperature = Gas at room temperature = Radioactive = Artificially Made KEY METALS NON-METALS 12.011 http://education.jlab.org/ Last revised on April 3, 2013 [294] H Li Na K Be Mg Ca Sc Ti Rb Cs Fr Sr Y Ba Ra Zr Hf Rf V Nb Ta Db Cr Mo W Sg Mn Tc Re Bh Fe Ru Os Hs Co Rh Ir Mt Ni Pd Pt Ds Cu Ag Au Rg Zn Cd Hg Cn Ga In Tl Uut Ge Sn Pb Fl As Sb Bi Uup Se Te Po Lv Br I At Uus Kr Xe Rn Uuo La Ac Ce Th Pr Pa Nd U Pm Np Sm Pu Eu Am Gd Cm Tb Bk Dy Cf Ho Es Er Fm Tm Md Yb Yb No Lu Lr B Al C Si N P O S F Cl Ne He Ar HYDROGEN LITHIUM SODIUM POTASSIUM BERYLLIUM MAGNESIUM CALCIUM SCANDIUM TITANIUM RUBIDIUM CESIUM FRANCIUM STRONTIUM YTTRIUM BARIUM RADIUM ZIRCONIUM HAFNIUM RUTHERFORDIUM VANADIUM NIOBIUM TANTALUM DUBNIUM CHROMIUM MOLYBDENUM TUNGSTEN SEABORGIUM MANGANESE TECHNETIUM RHENIUM BOHRIUM IRON RUTHENIUM OSMIUM HASSIUM

199

The Periodic Table of Elements C  

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

.011 .011 Atomic Number Chemical Symbol Atomic Weight Chemical Name = Solid at room temperature = Liquid at room temperature = Gas at room temperature = Radioactive = Artificially Made KEY METALS NON-METALS http://education.jlab.org/ Last revised on April 3, 2013 [294] H Li Na K Be Mg Ca Sc Ti Rb Cs Fr Sr Y Ba Ra Zr Hf Rf V Nb Ta Db Cr Mo W Sg Mn Tc Re Bh Fe Ru Os Hs Co Rh Ir Mt Ni Pd Pt Ds Cu Ag Au Rg Zn Cd Hg Cn Ga In Tl Uut Ge Sn Pb Fl As Sb Bi Uup Se Te Po Lv Br I At Uus Kr Xe Rn Uuo La Ac Ce Th Pr Pa Nd U Pm Np Sm Pu Eu Am Gd Cm Tb Bk Dy Cf Ho Es Er Fm Tm Md Yb Yb No Lu Lr B Al C Si N P O S F Cl Ne He Ar HYDROGEN LITHIUM SODIUM POTASSIUM BERYLLIUM MAGNESIUM CALCIUM SCANDIUM TITANIUM RUBIDIUM CESIUM FRANCIUM STRONTIUM YTTRIUM BARIUM RADIUM ZIRCONIUM HAFNIUM RUTHERFORDIUM VANADIUM NIOBIUM TANTALUM DUBNIUM CHROMIUM MOLYBDENUM TUNGSTEN SEABORGIUM MANGANESE TECHNETIUM RHENIUM BOHRIUM IRON RUTHENIUM OSMIUM HASSIUM COBALT

200

Intel® Inspector XE  

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

If none of the threads release their resources, then none of the threads can proceed. GDI Resource Leak Occurs when a GDI object is created but never deleted. Incorrect memcpy...

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


201

New limit on the mass of 9.4-keV solar axions emitted in an M1 transition in $^{83}$Kr nuclei  

E-Print Network (OSTI)

A search for resonant absorption of the solar axion by $^{83}\\rm{Kr}$ nuclei was performed using the proportional counter installed inside the low-background setup at the Baksan Neutrino Observatory. The obtained model independent upper limit on the combination of isoscalar and isovector axion-nucleon couplings $|g_3-g_0|\\leq 1.69\\times 10^{-6}$ allowed us to set the new upper limit on the hadronic axion mass of $m_{A}\\leq 130$ eV (95\\% C.L.) with the generally accepted values $S$=0.5 and $z$=0.56.

Derbin, A V; Gavrilyuk, Yu M; Kazalov, V V; Kim, H J; Kim, Y D; Kobychev, V V; Kuzminov, V V; Ali, Luqman; Muratova, V N; Panasenko, S I; Ratkevich, S S; Semenov, D A; Tekueva, D A; Yakimenko, S P; Unzhakov, E V

2015-01-01T23:59:59.000Z

202

Raman-shifted KrF laser radiation with low amplified spontaneous emission for a rotational Raman daytime-temperature lidar  

SciTech Connect

Various configurations of a tunable two-stage KrF laser have been investigated for providing powerful laser pulses with very low amplified spontaneous emission (ASE). The lowest fraction (0.00017%) of ASE was attained with a single-pass amplifier and a phase-conjugate Brillouin mirror. The most suitable application envisaged for the laser source, i.e., remote daytime-temperature measurement by means of rotational Raman scattering, is a dedicated oscillator--amplifier configuration with an ASE of 0.005% at an output of 300 mJ. The very low values of ASE were measured with the aid of a thallium atomic-vapor filter.

Luckow, F.; Voss, E.; Zeyn, J.; Lahmann, W.; Weitkamp, C.; Michaelis, W. (Institut fuer Physik, GKSS-Forschungszentrum Geesthacht GmbH, D-21502 Geesthacht (Germany))

1994-07-15T23:59:59.000Z

203

Mean ranges and energy-loss of 86Kr in aluminium, and 238U in hostaphan polymer, by a nuclear track technique  

Science Journals Connector (OSTI)

CR-39 track detectors have been used to measure mean ranges and energy-loss of 17.7 MeV amu-186Kr in aluminium, and 16.34 MeV amu-1238U in Hostaphan. The nuclear track technique employed in this work has been described in brief. The accuracy of measurement has been evaluated and is presented in this paper. Experimental range data are compared with theoretical values obtained from four different sources. The significance and scope of the work is discussed.

Atul Saxena; K.K. Dwivedi

1990-01-01T23:59:59.000Z

204

Pion correlations in 1.8A GeV Ar on KCl and La and 1.2A GeV Xe on La  

Science Journals Connector (OSTI)

Results are presented for pion interferometry measurements of 1.8A GeV Ar+KCl and Ar+La, and 1.2A GeV Xe + La at the Lawrence Berkeley Laboratory Heavy Ion Spectrometer System. The parameters R, ?, ?, R?, and R? are presented for all three projectile-target combinations. The correlation between the extracted size of the pion source and the centrality of the collision is investigated as well as the freeze-out densities and the dependence of the source size on the mean momentum of the pion pairs. The experimental setup and analysis are discussed and comparisons made with the results of others. The phase space covered is at forward angles in the center-of-mass system.

W. B. Christie; W. F. J. Mueller; D. L. Olson; T. J. M. Symons; H. H. Wieman; D. Beavis; F. P. Brady; J. L. Romero; C. E. Tull; T. Abbott; S. Y. Fung; D. Keane; Y. Liu

1992-06-01T23:59:59.000Z

205

Quasi-elastic peak lineshapes in adsorbate diffusion on nearly flat surfaces at low coverages: the motional narrowing effect in Xe on Pt(111)  

E-Print Network (OSTI)

Quasi-elastic helium atom scattering measurements have provided clear evidence for a two-dimensional free gas of Xe atoms on Pt(111) at low coverages. Increasing the friction due to the surface, a gradual change of the shape of the quasi-elastic peak is predicted and analyzed for this system in terms of the so-called motional narrowing effect. The type of analysis presented here for the quasi-elastic peak should be prior to any deconvolution procedure carried out in order to better extract information from the process, e.g. diffusion coefficients and jump distributions. Moreover, this analysis also provides conditions for the free gas regime different than those reported earlier.

R. Martinez-Casado; J. L. Vega; A. S. Sanz; S. Miret-Artes

2006-08-31T23:59:59.000Z

206

his being, showed us the Temple of Mathematics. The Pages of the Book were there, we had only to open them. Did there, for every k;r 0, exist  

E-Print Network (OSTI)

to open them. Did there, for every k;r 0, exist a graph G which when r-edge colored necessarily yielded- plaining the correct usage. It appears there was yet a fourth simultaneous conversation. Those were of Paul Erdos. We and the list is long indeed had energy and talent. Paul, through his actions and his

Spencer, Joel

207

Application of a high-power KrF laser for the study of supersonic gas flows and the development of hydrodynamic instabilities in layered media  

SciTech Connect

The design of a miniature laser shock tube for the study of a wide range of hydrodynamic phenomena in liquids at pressures greater than 10 kbar and in supersonic flows with large Mach numbers (greater than 10) is discussed. A substance filling a chamber of quadratic cross section, with a characteristic size of several centimetres, is compressed and accelerated due to local absorption of 100 ns, 100 J KrF laser pulses near the entrance window. It is proposed to focus a laser beam by a prism raster, which provides a uniform intensity distribution over the tube cross section. The system can be used to study the hypersonic flow past objects of complex shape and the development of hydrodynamic instabilities in the case of a passage of a shock wave or a compression wave through the interfaces between different media. (laser applications and other topics in quantum electronics)

Zvorykin, V D; Lebo, I G [P.N. Lebedev Physics Institute, Russian Academy of Sciences, Moscow (Russian Federation)

2000-06-30T23:59:59.000Z

208

Nonlinear-optical processes in the near-resonant two-photon excitation of xenon by femtosecond KrF-excimer-laser pulses  

Science Journals Connector (OSTI)

The nonlinear response of xenon gas due to a near-resonant two-photon excitation at the 5p6 1S0?6p[1/2]0 transition with a femtosecond KrF-excimer-laser system is investigated for the intensity range 1010–1015 W/cm2. Stimulated hyper-Raman scattering and amplified spontaneous emission of atomic xenon are observed at wavelengths around 823 and 828 nm. These emissions are superimposed by four-wave parametric-oscillation processes leading to strong ultrashort continuum radiation in the visible and near-infrared (650–850 nm), uv (185–400 nm), and vacuum ultraviolet (147–155 nm) spectral ranges with output powers up to 100 MW. From difference-frequency-mixing experiments microscopic nonlinear susceptibilities in the range of ??(3)?=10-48 to 10-50 m5/V2 have been determined, which are in good agreement with calculations.

A. Tünnermann; K. Mossavi; B. Wellegehausen

1992-09-01T23:59:59.000Z

209

First result of the experimental search for the 9.4 keV solar axion reactions with Kr-83 in the copper proportional counter  

E-Print Network (OSTI)

The experimental search for solar hadronic axions is started at the Baksan Neutrino Observatory of the Institute for Nuclear Researches Russian Academy of Science. It is assumed that axions are created in the Sun during M1-transition between the first thermally excited level at 9.4 keV and the ground state in Kr-83. The experiment is based on axion detection via resonant absorption process by the same nucleus in the detector. The big copper proportional counter filled with krypton is used to detect signals from axions. The experimental setup is situated in the deep underground low background laboratory. No evidence of axion detection were found after the 26.5 days data collection. Resulting new upper limit on axion mass is m_{A} < 130 eV at 95% C.L.

Yu. M. Gavrilyuk; A. M. Gangapshev; A. V. Derbin; V. V. Kazalov; H. J. Kim; Y. D. Kim; V. V. Kobychev; V. V. Kuzminov; Luqman Ali; V. N. Muratova; S. I. Panasenko; S. S. Ratkevich; D. A. Semenov; D. A. Tekueva; S. P. Yakimenko; E. V. Unzhakov

2014-05-06T23:59:59.000Z

210

Production of extended plasma channels in atmospheric air by amplitude-modulated UV radiation of GARPUN-MTW Ti : sapphire-KrF laser. Part 1. Regenerative amplification of subpicosecond pulses in a wide-aperture electron beam pumped KrF amplifier  

SciTech Connect

Regenerative amplification of single and multiple ultrashort subpicosecond UV pulses in a wide-aperture KrF amplifier with an unstable confocal resonator was investigated on the GARPUN-MTW hybrid laser system. Amplitude-modulated 100-ns long UV radiation pulses with an energy of several tens of joules were obtained at the output of the system. The pulses were a combination of a quasi-stationary oscillation pulse and a train of amplified ultrashort pulses (USPs) with a peak power of 0.2-0.3 TW, which exceeded the power of free-running lasing pulse by three orders of magnitude. The population inversion recovery time in the active KrF laser medium was estimated: {tau}{sub c} {<=} 2.0 ns. Trains of USPs spaced at an interval {Delta}t Almost-Equal-To {tau}{sub c} were shown to exhibit the highest amplification efficiency. The production of amplitude-modulated UV pulses opens up the way to the production and maintenance of extended plasma channels in atmospheric air. (extreme light fields and their applications)

Zvorykin, V D; Ionin, Andrei A; Levchenko, A O; Mesyats, Gennadii A; Seleznev, L V; Sinitsyn, D V; Smetanin, Igor V; Sunchugasheva, E S; Ustinovskii, N N; Shutov, A V [P N Lebedev Physics Institute, Russian Academy of Sciences, Moscow (Russian Federation)

2013-04-30T23:59:59.000Z

211

High-resolution laser spectroscopy between 0.9 and 14.3 THz in a supersonic beam: Rydberg-Rydberg transitions of atomic Xe at intermediate n values  

SciTech Connect

A laser-based, pulsed, narrow-band source of submillimeter-wave radiation has been developed that is continuously tunable from 0.1 THz to 14.3 THz. The source is based on difference-frequency mixing in the nonlinear crystal trans-4{sup Prime }-(dimethylamino)-N-methyl-4-stilbazolium tosylate. By varying the pulse length, the bandwidth of the submillimeter-wave radiation can be adjusted between 85 MHz and 2.8 MHz. This new radiation source has been integrated in a vacuum-ultraviolet-submillimeter-ware double-resonance spectrometer, with which low-frequency transitions of atoms and molecules in supersonic beams can be detected mass-selectively by photoionization and time-of-flight mass spectrometry. The properties of the radiation source and spectrometer are demonstrated in a study of 33f Leftwards-Arrow nd Rydberg-Rydberg transitions in Xe with n in the range 16-31. The frequency calibration of the submillimeter-wave radiation was performed with an accuracy of 2.8 MHz. The narrowest lines observed experimentally have a full-width at half-maximum of {approx}3 MHz, which is sufficient to fully resolve the hyperfine structure of the Rydberg-Rydberg transitions of {sup 129}Xe and {sup 131}Xe. A total of 72 transitions were measured in the range between 0.937 THz and 14.245 THz and their frequencies are compared with frequencies calculated by multichannel quantum defect theory.

Haase, Christa; Agner, Josef A.; Merkt, Frederic [Laboratorium fuer Physikalische Chemie, ETH Zuerich, 8093 Zuerich (Switzerland)

2013-06-28T23:59:59.000Z

212

Deformation effects and neutrinoless positron ?? decay of Ru96, Pd102, Cd106, Xe124, Ba130, and Dy156 isotopes within a mechanism involving Majorana neutrino mass  

Science Journals Connector (OSTI)

The (?+?+)0? and (??+)0? modes of Ru96, Pd102, Cd106, Xe124, Ba130, and Dy156 isotopes are studied in the projected Hartree-Fock-Bogoliubov framework for the 0+?0+ transition. The reliability of the intrinsic wave functions required to study these decay modes has been established in our earlier works by obtaining an overall agreement between the theoretically calculated spectroscopic properties, namely yrast spectra, reduced B(E2:0+?2+) transition probabilities, quadrupole moments Q(2+) and gyromagnetic factors g(2+), and the available experimental data in the parent and daughter even-even nuclei. In the present work, the required nuclear transition matrix elements are calculated in the Majorana neutrino mass mechanism using the same set of intrinsic wave functions as used to study the two neutrino positron double-? decay modes. Limits on effective light neutrino mass ?m?? and effective heavy neutrino mass ?MN? are extracted from the observed limits on half-lives T1/20?(0+?0+) of (?+?+)0? and (??+)0? modes. We also investigate the effect of quadrupolar correlations vis-a-vis deformation on nuclear transition matrix elements (NTMEs) required to study the (?+?+)0? and (??+)0? modes.

P. K. Rath, R. Chandra, K. Chaturvedi, P. K. Raina, and J. G. Hirsch

2009-10-06T23:59:59.000Z

213

van der Waals-corrected Density Functional Theory simulation of adsorption processes on transition-metal surfaces: Xe and graphene on Ni(111)  

E-Print Network (OSTI)

The DFT/vdW-WF2s1 method, recently developed to include the van der Waals interactions in the Density Functional Theory and describe adsorption processes on metal surfaces by taking metal-screening effects into account, is applied to the case of the interaction of Xe and graphene with a transition-metal surface, namely Ni(111). In general the adsorption of rare-gas atoms on metal surfaces is important because is prototypical for physisorption processes. Moreover, the interaction of graphene with Ni(111) is of particular interest for practical applications (efficient and large-scale production of high-quality graphene) and, from a theoretical point of view, is particularly challenging, since it can be described by a delicate interplay between chemisorption and physisorption processes. The first-principles simulation of transition metals require particular care also because they can be viewed as intermediate systems between simple metals and insulating crystals. Even in these cases the method performs well as d...

Silvestrelli, Pier Luigi

2015-01-01T23:59:59.000Z

214

XE6_Tips_022011.pptx  

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

For For m ost u sers a nd a pplica1ons, u sing d efault s e5ngs w ork very well  For users who want to experiment to get the best performance t hey c an, t he f ollowing p resenta1on g ives y ou some informa1on on compilers and se5ngs to try  While i t d oesn't c over a bsolutely e verything, t he p resenta7on tries t o a ddress s ome o f t he t unable p arameters w hich w e h ave found t o p rovide i ncreased p erformance i n t he s itua7ons discussed 2 xtpe---mc12 If n o m odule i s l oaded, a nd n o ' arch' s pecified i n the c ompiler o p;ons, t he c ompilers d efault t o the n ode t ype o n w hich t he c ompiler i s r unning: Which m ay n ot b e t he s ame a s t he c ompute nodes ! 3 The best compiler is not the same for every applica1on 4  PGI - V ery g ood F ortran, o kay C a nd C ++  Good v ectoriza7on 

215

Low-lying E1,M1, and E2 strength distributions in {sup 124,126,128,129,130,131,132,134,136}Xe: Systematic photon scattering experiments in the mass region of a nuclear shape or phase transition  

SciTech Connect

Systematic nuclear resonance fluorescence (NRF) experiments on all nine stable (seven even-even and two odd-mass) Xe isotopes have been performed at the bremsstrahlung facility of the 4.3-MV Stuttgart Dynamitron accelerator. For the first time thin-walled, high-pressure gas targets (about 70 bar) with highly enriched target material were used in NRF experiments. Precise excitation energies, transition strengths, spins, and decay branching ratios were obtained for numerous states, most of them previously unknown. The systematics of the observed E1 two-phonon excitations (2{sup +}x3{sup -}) and M1 excitations to 1{sup +} mixed-symmetry states in the even-even isotopes are discussed with respect to the new critical point symmetry E(5). The fragmentation of these fundamental dipole excitation modes in the odd-mass isotopes {sup 129,131}Xe is shown and discussed. In the even-even nuclei several low-lying E2 excitations were observed.

Garrel, H. von; Kneissl, U.; Kohstall, C.; Pitz, H.H.; Scheck, M.; Stedile, F.; Walter, S. [Institut fuer Strahlenphysik, Universitaet Stuttgart, D-70569 Stuttgart (Germany); Brentano, P. von; Fransen, C.; Friessner, G.; Hollmann, N.; Jolie, J.; Linnemann, A.; Muecher, D.; Pietralla, N.; Scholl, C.; Werner, V. [Institut fuer Kernphysik, Universitaet zu Koeln, D-50937 Cologne (Germany); Kaeppeler, F.; Wisshak, K. [Institut fuer Kernphysik, Forschungszentrum Karlsruhe, D-76021 Karlsruhe (Germany); Kaeubler, L. [Institut fuer Kern- und Hadronenphysik, Forschungszentrum Rossendorf, D-01314 Dresden (Germany)] (and others)

2006-05-15T23:59:59.000Z

216

Direct measurements of methoxy removal rate constants for collisions with CH/sub 4/, Ar, N/sub 2/, Xe, and CF/sub 4/ in the temperature range 673--973K  

SciTech Connect

Removal rate constants for CH/sub 3/O by CH/sub 4/, Ar, N/sub 2/, Xe, and CF/sub 4/ were measured over a 400K temperature range using a laser photolysis/laser-induced fluorescence technique. Rapid methoxy removal rates are observed for the non-reactive collision partners (Ar, N/sub 2/, Xe, and CF/sub 4/) at elevated temperatures showing that the dissociation and isomerization channels for CH/sub 3/O are indeed important. The total removal rate constant (reaction /plus/ dissociation and/or isomerization) for CH/sub 4/ exhibits a linear dependence on temperature and has a removal rate constant, k/sub r/ /equals/ (1.2 +- 0.6) /times/ 10/sup /minus/8/exp((/minus/101070 +- 350)/T)cm/sup 3/molecule/sup /minus/1/s/sup /minus/1/. Assuming that the removal rate constant due to dissociation and/or isomerization are similar for CH/sub 4/ and CF/sub 4/, the reaction rate constant for CH/sub 3/O /plus/ CH/sub 4/ is equal to (1.7 +- 1.0) /times/ 10/sup /minus/10/exp((/minus/7480 +- 1100)/T)cm/sup 3/molecule/sup /minus/1/s/sup /minus/1/. 7 refs., 4 figs.

Wantuck, P.J.; Oldenborg, R.C.; Baugchum, S.L.; Winn, K.R.

1988-01-01T23:59:59.000Z

217

Upgrade of the Resonance Ionization Mass Spectrometer for Precise Identification of Failed Fuel in a Fast Reactor  

SciTech Connect

Isotopic analysis of krypton (Kr) and xenon (Xe) by resonance ionization mass spectrometry (RIMS) is an effective tool for identification of failed fuel in fast reactors to achieve their safety operation and high plant availability. Reliability of the failed fuel detection and location (FFDL) system depends on the precise determination of {sup 78}Kr/{sup 80}Kr, {sup 82}Kr/{sup 80}Kr and {sup 126}Xe/{sup 129}Xe isotopic ratios, which is mainly hampered by statistical errors for detection of the corresponding isotopes except {sup 82}Kr generated in large amounts during operation of fast reactors. In this paper, we report on improvements of the laser optical system of our spectrometer to increase the resonance ionization efficiency of Kr and Xe atoms, focusing on (i) utilization of the uniform YAG laser beam to improve the wavelength conversion efficiency of sum frequency generation and (ii) reflection of the ultraviolet light by a concave mirror to increase the photon density. The results indicate that our upgraded resonance ionization mass spectrometer has enough performance for isotopic analysis of Kr and Xe required in the Monju FFDL system.

Iwata, Yoshihiro; Ito, Chikara [Experimental Fast Reactor Department, Oarai Research and Development Center, Japan Atomic Energy Agency, 4002 Narita, Oarai, Ibaraki 311-1393 (Japan); Harano, Hideki [National Institute of Advanced Industrial Science and Technology, Central 2, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568 (Japan); Aoyama, Takafumi [Experimental Fast Reactor Department, Oarai Research and Development Center, Japan Atomic Energy Agency, 4002 Narita, Oarai, Ibaraki 311-1393 (Japan); Research Institute of Nuclear Engineering, University of Fukui, 3-9-1 Bunkyo, Fukui 910-8507 (Japan)

2011-12-13T23:59:59.000Z

218

, scjoo}@wonkwang.ac.kr csshin@sunchon.ac.kr  

E-Print Network (OSTI)

Information Supporting System Based on Indoor Location for Healthcare Home Service Dong-In Ahn0* , Chang-Sun

Joo, Su-Chong

219

E-Print Network 3.0 - alo vanatoa peeter Sample Search Results  

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

STUDIES OF Xe AND Kr FROM THE Summary: on Sapphire (AloS) collectors, but the hard landing of Genesis fractured these collectors, changing our... from the AloS collectors....

220

E-Print Network 3.0 - alo peets maarja Sample Search Results  

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

STUDIES OF Xe AND Kr FROM THE Summary: on Sapphire (AloS) collectors, but the hard landing of Genesis fractured these collectors, changing our... from the AloS collectors....

Note: This page contains sample records for the topic "uus kr xe" 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.


221

E-Print Network 3.0 - aloe barbadensis inyectable Sample Search...  

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

STUDIES OF Xe AND Kr FROM THE Summary: on Sapphire (AloS) collectors, but the hard landing of Genesis fractured these collectors, changing our... from the AloS collectors....

222

Record of Cycling Operation of the Natural Nuclear Reactor in the Oklo/Okelobondo Area in Gabon  

E-Print Network (OSTI)

of variability of the long-term fundamental physical constants [5,6] to storage of nuclear wastes in geological on how to retain nuclear wastes, including fission Xe and Kr, and prevent uncontrolled runaway chain

223

Microsoft Word - DOE-ID-14-045 Georgia Institute of Tech. ...  

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

Description Georgia Tech Research Corporation will develop a novel, high-performance, low-energy intensity, lower-cost zeolite membrane process for KrXe separation during spent...

224

Table of Contents  

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

IV: ATOMIC AND MOLECULAR SCIENCE Target K Vacancy Production by 2.5 to 25 MeVu Ar, Kr, and Xe Ions ... IV-1 Y. Peng, R. L. Watson, V. Horvat,...

225

Completion of the ORNL Fuel Cycle Research and Development (FCR&D) Level 4 Milestone – Sigma Team – Off-Gas – ORNL – FT-14OR031202, MS# M4FT-14OR0312027, “Support to PNNL Kr-85 Preliminary Optimization Study”, due May 30, 2014  

SciTech Connect

This letter and attached emails document the completion of the FCR&D Level 4 milestone for the Sigma Team – Off-Gas – ORNL work package (FT-14OR031202), “Support to PNNL Kr-85 Preliminary Optimization Study” (M4FT-14OR0312027), due May 30, 2014. Support to this effort included providing a literature search and providing a significant number of reference documents covering more than 30 years of past work on Kr recovery, recovery system designs, and past cost analyses. In addition, ORNL provided support on several conference calls to establish an analysis approach for the current study and to review progress.

Jubin, Robert T. [ORNL] [ORNL

2014-05-30T23:59:59.000Z

226

Search for 2{nu}{beta}{beta} Decay of {sup 130}Te to the First Excited State of {sup 130}Xe with an Ultra-Low-Background Germanium Crystal Array  

SciTech Connect

The goal of searching for zero-neutrino double-beta (0{nu}{beta}{beta}) decay is to probe an absolute neutrino mass scale suggested by the mass-splitting parameters observed by neutrino oscillation experiments. Furthermore, observation of 0{nu}{beta}{beta} decay is an explicit instance of Lepton-number non-conservation. A sensitive measurement of two-neutrino double-beta (2{nu}{beta}{beta}) decay can provide critical input to Quasiparticle Random Phase Approximation (QRPA) calculations of the nuclear matrix elements in models similar to those used to extract the absolute neutrino mass from (0{nu}{beta}{beta}) decay experiments. Tellurium-130, an even-even nucleus, can undergo 2{nu}{beta}{beta} decay to the first 0+ excited state of {sup 130}Xe producing three possible {gamma}-ray cascades as it transitions to the ground state. The Cascades detector is a high purity germanium (HPGe) crystal array consisting of two ultra-low-background copper cryostats each housing a hexagonal array of seven crystals. The project is currently being developed at Pacific Northwest National Laboratory in Richland, WA (USA), and aims to obtain very high {gamma}-ray detection efficiency while utilizing highly effective and low-background shielding. GEANT4 simulations of the detector are performed for a {sup 130}Te sample in order to determine the optimum size and geometry of the source for maximum detection efficiency and predict its sensitivity for measuring 2{nu}{beta}{beta} decay to the first 0+ excited state of {sup 130}Xe. These simulations are validated with calibration sources and presented.

Mizouni, L. K. [Pacific Northwest National Laboratory, P.O. Box 999, Richland WA 99352 (United States); University of South Carolina, 712 Main St., Columbia, SC 29208 (United States); Aalseth, C. E.; Erikson, L. E.; Hossbach, T. W.; Keillor, M. E.; Orrell, J. L. [Pacific Northwest National Laboratory, P.O. Box 999, Richland WA 99352 (United States); Avignone, F. T. III [University of South Carolina, 712 Main St., Columbia, SC 29208 (United States)

2011-12-13T23:59:59.000Z

227

Isotope effect on hydrogen atom abstraction reaction by recoil tritium atoms in Xe-C/sub 2/H/sub 6/-C/sub 2/D/sub 6/ mixtures at 77 K  

SciTech Connect

Recoil T atom reactions have been studied in Xe-C/sub 2/H/sub 6/-C/sub 2/D/sub 6/ mixtures as 77 K. The ratio of the HT yield to the DT yield at 0.2 mol % ethane (C/sub 2/H/sub 6/+C/sub 2/D/sub 6/) is much higher than the C/sub 2/H/sub 6//C/sub 2/D/sub 6/ ratio. The H/D abstraction isotope effect for the T atom reaction with C/sub 2/H/sub 6/ and C/sub 2/D/sub 6/ is 3.5-6 at .02 mol % ethane, while the effect decreases with an increase of ethane concentration down to 1.4 at a concentration higher than 10 mol %. The remarkable isotope effect at the low concentration of ethane is much higher than the isotope effect (1.3) for the hot T atom reaction in the gas phase and is ascribed to a quantum-mechanical tunneling reaction by thermalized T atoms with ethane. The rate constant for the tunneling abstraction is calculated by using the unsymmetrical Eckart potential function and the effective mass in the linear triatomic system. It is concluded that T atoms can react with ethane by quantum-mechanical tunneling as easily as H atoms do.

Aratone, Y. (Japan Atomic Energy Research Inst.); Tachikawa, E.; Miyazaki, T.; Nagaya, S.; Fujitani, Y.; Fueki, K.

1983-03-31T23:59:59.000Z

228

Heats of Formation of XeF3+, XeF3?, XeF5+, XeF7+, XeF7?, and XeF8 from High Level Electronic Structure Calculations  

Science Journals Connector (OSTI)

Daniel J. Grant , Tsang-Hsiu Wang and David A. Dixon * ... Vibrational zero point energies were computed at the MP2 level of theory. ... All CCSD(T) calculations were performed with either the MOLPRO-2002(33) program system on a single processor of an SGI Origin computer or the DMC at the Alabama Supercomputer Center or with NWChem(34) and MOLPRO on the massively parallel HP Linux cluster in the Molecular Science Computing Facility in the William R. Wiley Environmental Molecular Sciences Laboratory. ...

Daniel J. Grant; Tsang-Hsiu Wang; David A. Dixon; Karl O. Christe

2009-12-08T23:59:59.000Z

229

Production of extended plasma channels in atmospheric air by amplitude-modulated UV radiation of GARPUN-MTW Ti : sapphire-KrF laser. Part 2. Accumulation of plasma electrons and electric discharge control  

SciTech Connect

The problem of the production of extended ({approx}1 m) plasma channels is studied in atmospheric air by amplitude-modulated laser pulses of UV radiation, which are a superposition of a subpicosecond USP train amplified in a regenerative KrF amplifier with an unstable confocal resonator and a quasi-stationary lasing pulse. The USPs possess a high (0.2-0.3 TW) peak power and efficiently ionise oxygen molecules due to multiphoton ionisation, and the quasi-stationary lasing pulse, which has a relatively long duration ({approx}100 ns), maintains the electron density at a level n{sub e} = (3-5) Multiplication-Sign 10{sup 14} cm{sup -3} by suppressing electron attachment to oxygen. Experiments in laser triggering of high-voltage electric discharges suggest that the use of combined pulses results in a significant lowering of the breakdown threshold and enables controlling the discharge trajectory with a higher efficiency in comparison with smooth pulses. It was shown that controlled breakdowns may develop with a delay of tens of microseconds relative to the laser pulse, which is many orders of magnitude greater than the lifetime of free electrons in the laser-induced plasma. We propose a mechanism for this breakdown, which involves speeding-up of the avalanche ionisation of the air by negative molecular oxygen ions with a low electron binding energy ({approx}0.5 eV) and a long lifetime ({approx}1 ms), which are produced upon cessation of the laser pulse. (extreme light fields and their applications)

Zvorykin, V D; Ionin, Andrei A; Levchenko, A O; Mesyats, Gennadii A; Seleznev, L V; Sinitsyn, D V; Smetanin, Igor V; Sunchugasheva, E S; Ustinovskii, N N; Shutov, A V [P N Lebedev Physics Institute, Russian Academy of Sciences, Moscow (Russian Federation)

2013-04-30T23:59:59.000Z

230

Computational Study of Xe(OH)4, XeO(OH)3–, and XeO2(OH)22–  

Science Journals Connector (OSTI)

School of Applied Chemistry, Chung Shan Medical University, 402 Taichung, Taiwan, Republic of China ... (1) Because of their lack of chemical reactivity, noble gases are also used in lighting. ...

Chin-Hung Lai

2012-09-18T23:59:59.000Z

231

Space-time evolution of the reactions sup 14 N+ sup 27 Al, sup 197 Au at E / A =75 MeV and sup 129 Xe+ sup 27 Al, sup 122 Sn at E / A =31 MeV probed by two-proton  

SciTech Connect

Two-proton correlation functions have been measured at {theta}{sub lab}{approx}25{degree} for the forward kinematics'' reactions {sup 14}N+{sup 27}Al, {sup 14}N+{sup 197}Au at {ital E}/{ital A}=75 MeV, for the inverse kinematics'' reaction {sup 129}Xe+{sup 27}Al at {ital E}/{ital A}=31 MeV, and for the nearly symmetric reaction {sup 129}Xe+{sup 122}Sn at {ital E}/{ital A}=31 MeV. For the reactions at 75 MeV per nucleon, the correlation functions exhibit pronounced maxima at relative proton momenta, {ital q}{approx}20 MeV/{ital c}, and minima at {ital q}{approx}0 MeV/{ital c}. These correlations indicate emission from fast, nonequilibrium processes. They are analyzed in terms of standard Gaussian source parametrizations and compared to microscopic simulations performed with the Boltzmann-Uehling-Uhlenbeck equation. For the reactions at 31 MeV per nucleon, the two-proton correlation functions do not exhibit maxima at {ital q}{approx}20 MeV/{ital c}, but only minima at {ital q}{approx}0 MeV/{ital c}. These correlations indicate emission on a slower time scale. They can be reproduced by calculations based on the Weisskopf formula for evaporative emission from fully equilibrated compound nuclei. For all reactions, the measured longitudinal and transverse correlation functions are very similar, in agreement with theoretical predictions.

Gong, W.G.; Gelbke, C.K.; Bauer, W.; Carlin, N.; de Souza, R.T.; Kim, Y.D.; Lynch, W.G.; Murakami, T.; Poggi, G.; Sanderson, D.P.; Tsang, M.B.; Xu, H.M. (National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan (USA) Department of Physics Astronomy, Michigan State University, East Lansing, Michigan 48824 (USA)); Fields, D.E.; Kwiatkowski, K.; Planeta, R.; Viola, V.E. Jr.; Yennello, S.J. (Indiana University Cyclotron Facility, Indiana University, Bloomington, Indiana 47405 (USA)); Pratt, S. (Department of Physics, University of Wisconsin, Madison, Wisconsin 53706 (USA))

1991-04-01T23:59:59.000Z

232

An atom trap trace analysis system for measuring krypton contamination in xenon dark matter detectors  

SciTech Connect

We have developed an atom trap trace analysis (ATTA) system to measure Kr in Xe at the part per trillion (ppt) level, a prerequisite for the sensitivity achievable with liquid xenon dark matter detectors beyond the current generation. Since Ar and Kr have similar laser cooling wavelengths, the apparatus has been tested with Ar to avoid contamination prior to measuring Xe samples. A radio-frequency plasma discharge generates a beam of metastable atoms which is optically collimated, slowed, and trapped using standard magneto-optical techniques. Based on the measured overall system efficiency of 1.2 × 10{sup ?8} (detection mode), we expect the ATTA system to reach the design goal sensitivity to ppt concentrations of Kr in Xe in <2 h.

Aprile, E.; Yoon, T.; Loose, A.; Goetzke, L. W.; Zelevinsky, T. [Department of Physics, Columbia University, New York, New York 10027-5255 (United States)] [Department of Physics, Columbia University, New York, New York 10027-5255 (United States)

2013-09-15T23:59:59.000Z

233

Masses of Kr-76 and K-74  

E-Print Network (OSTI)

. Touchard, and H. Wollnik, Phys. Rev. C 19, 1504 {1979). 5G. Audi, M. Epherre, C. Thibault, A. H. Wapstra, and K. Bos, Nucl. Phys. A378, 443 (1982). D. M. Moltz, K. S. Toth, F. T. Avignone, III, H. Noma, B. G. Ritchie, and B. D. Kern, Phys. Lett. 113B.... D. Cossairt, D. P. May, and R. A. Kenefick, Phys. Rev. C 16, 917 {1977). R. E. Tribble, R. A. Kenefick, and R. L. Spross, Phys. Rev. C 13, 50 (1976). ~4R. E. Tribble, J. D. Cossairt, and R. A. Kenefick, Phys. Lett. 61B, 353 (1976). R. E...

Moltz, D. M.; Toth, K. S.; Tribble, Robert E.; Neese, R. E.; Sullivan, J. P.

1982-01-01T23:59:59.000Z

234

Cryogenic system with GM cryocooler for krypton, xenon separation from hydrogen-helium purge gas  

SciTech Connect

In the thorium molten salt reactor (TMSR), fission products such as krypton, xenon and tritium will be produced continuously in the process of nuclear fission reaction. A cryogenic system with a two stage GM cryocooler was designed to separate Kr, Xe, and H{sub 2} from helium purge gas. The temperatures of two stage heat exchanger condensation tanks were maintained at about 38 K and 4.5 K, respectively. The main fluid parameters of heat transfer were confirmed, and the structural heat exchanger equipment and cold box were designed. Designed concentrations after cryogenic separation of Kr, Xe and H{sub 2} in helium recycle gas are less than 1 ppb.

Chu, X. X.; Zhang, D. X.; Qian, Y.; Liu, W. [Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800 (China); Zhang, M. M.; Xu, D. [Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190 (China)

2014-01-29T23:59:59.000Z

235

GPS V-Geocast @korea.ac.kr, lchoi@korea.ac.kr  

E-Print Network (OSTI)

Century", Sci. Amer., pp. 66­75, Sept. 1991 [2] Perkins, M. Royer, "Ad hoc on demand distance vector://www.isi.edu/nsman/ns. [4] T. Camp, J. Boleng, and V. Davies, "A survey of mobility models for ad hoc network research

Choi, Lynn

236

jhchang@nova.snu.ac.kr {btzhang,ytkim}@cse.snu.ac.kr Helmholtz machine  

E-Print Network (OSTI)

, J., Elements of Information Theory, John Wiley & Sons, 1991. [2] Dayan, P., Hinton, G. E., Neal, R. M., Zemel, R. S., "The Helmholtz Machine", Neural Computation, vol. 7, pp. 889- 904, 1995. [3] Frey] Hinton, G. E., Dayan, P., Frey, B. J., and Neal, R. M., "The Wake-Sleep Algorithm for Unsupervised Neural

237

KrF Laser Development Opening Remarks on KrF Laser Development  

E-Print Network (OSTI)

shots @ 10 Hz (319 hrs) PLEX, LLC 200 kV, 4.5 kA, 250 ns, Marx > 80% efficiency Marx Pulse Forming Line Spark Gap main switch Pulse Forming Lines #12;8 Solid State system should be durable and efficient innovations gave high hibachi transmission: 1. Eliminate anode foil 2. Pattern the beam to "miss" the ribs

238

3G/WLAN *hsim@netlab.snu.ac.kr, sbahk@snu.ac.kr  

E-Print Network (OSTI)

) ,min ,max ,max max 1 ( , ) log(1 )(1 ) ( ) ) 1 i i i i i b i i i i i i r r U r N c N r r r r R N = + - - ( + (1) ir log , ir [2]. maxR #12; ,minir ,maxir i . ( )b ic N> . .(3) ,max , max , (1 )log 2 log 2 i broad i before broadcast i broad i before broadcast r c U R N P c

Bahk, Saewoong

239

Facile xenon capture and release at room temperature using a metal-organic framework: a comparison with activated charcoal  

SciTech Connect

Two well known Metal organic frameworks (MOF-5, NiDOBDC) were synthesized and studied for facile xenon capture and separation. Our results indicate the NiDOBDC adsorbs significantly more xenon than MOF-5, releases it more readily than activated carbon, and is more selective for Xe over Kr than activated carbon.

Thallapally, Praveen K.; Grate, Jay W.; Motkuri, Radha K.

2012-01-11T23:59:59.000Z

240

Metal-Insulator Transition in Metal—Rare-Gas Alloys  

Science Journals Connector (OSTI)

We present the results of electrical resistivity and optical absorption measurements for compositions spanning the metal-insulator transition in RbKr and CsXe alloys. The two transitions are similar and exhibit an apparently percolative character. No marked emergence of excitons accompanies the disappearance of conductivity. Spectral features associated with metallic conduction also persist through the transitions.

D. J. Phelps; R. Avci; C. P. Flynn

1975-01-06T23:59:59.000Z

Note: This page contains sample records for the topic "uus kr xe" 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.


241

Cosmic-ray-produced stable nuclides: various production rates and their implications  

SciTech Connect

The rates for a number of reactions producing certain stable nuclides, such as /sup 3/He and /sup 4/He, and fission in the moon are calculated for galactic-cosmic-ray particles and for solar protons. Solar-proton-induced reactions with bromine usually are not an important source of cosmogenic Kr isotopes. The /sup 130/Ba(n,p) reaction cannot account for the undercalculation of /sup 130/Xe production rates. Calculated production rates of /sup 15/N, /sup 13/C, and /sup 2/H agree fairly well with rates inferred from measured excesses of these isotopes in samples with long exposure ages. Cosmic-ray-induced fission of U and Th can produce significant amounts of fission tracks and of /sup 86/Kr, /sup 134/Xe, and /sup 136/Xe, especially in samples with long exposures to cosmic-ray particles.

Reedy, R.C.

1981-06-15T23:59:59.000Z

242

gwangui.hong@se.kaist.ac.kr, ekjee@se.kaist.ac.kr, bae@se.kaist.ac.kr Systematic code verification for properties of real-time  

E-Print Network (OSTI)

] . . UPPAAL [4] . TIMES Linux , ANSI-C CBMC(Bounded Model Checking for C/C++)[5_trans() , . CBMC ANSI-C , SAT(satisfiability problem) . CBMC main() , assert() (3 ), ANSI-C . VVI 1 7 . assert(!hp || rdClock(Ventricle_x)

Jee, Eunkyoung

243

Probing Aerogels by Multiple Quantum Filtered 131Xe NMR Spectroscopy  

Science Journals Connector (OSTI)

This is demonstrated in Figure 1 where four pulse sequences using multiple quantum filters are shown. ... Pyrex tube at 7.4 T, 1.2 MPa, and 298 K:? (a) double-quantum filtered pulse sequence, (b) magic-angle double-quantum filter which is a T2,±1 pulse sequence, (c) triple-quantum filtered sequence, and (d) triple-quantum filtered inversion recovery pulse sequence. ... 14-16 The tubes have been filled with aerogel fragments of a few millimeter diameter and were pressurized with xenon to about 6.9 MPa at 298 K to create supercritical conditions. ...

Thomas Meersmann; Michaël Deschamps; Geoffrey Bodenhausen

2001-01-13T23:59:59.000Z

244

Xe interacting with porous silicon Assaf Paldor,a  

E-Print Network (OSTI)

-SEM, were studied using xenon Temperature Programmed Desorption (TPD) as a probe of its inner pores cm. Mesoporous samples of pore diameters 40 Ã? 7 nm were fabricated in a single tank apparatus13 using

Asscher, Micha

245

Thermal Diffuse Scattering of Low-Energy Electrons from Xe  

E-Print Network (OSTI)

in the model of a slab with finite thickness. How'ever, Wallis and Maradudin' and Huber' have shown that for a semi-infinite crystal, in the continuum approxi- mation and the high-temperature limit, I,(Q) goes as ( g ?6 ) ' as ) g ?6 [ - 0, and Mc...). "R, F. Wallis and A. A. Maradudin, Phys. Rev. 14S, 962 (1966). "D. L. Huber, Phys. Rev. 153, 772 (1967). ' E. R. Jones, J. T, McKinney, and M, B, Webb, Phys. Rev. 151, 476 (1966). PHYSICA L REVIEW B VOLUME 7, NUMBER 2 15 JA NUARY 1973...

KESMODEL, LL; WETTE, FWD; Allen, Roland E.

1973-01-01T23:59:59.000Z

246

Portable MRI and 129Xe Signal Amplification by Gas Extraction  

E-Print Network (OSTI)

by nuclear magnetic resonance. Science, [24] E. Danieli, J.magnetic resonance hyperpolarized biosensor. Science, 314(Magnetic Reso- nance Imaging in a Fraction of a Second. Science,

Graziani, Dominic Michael

2011-01-01T23:59:59.000Z

247

Gas phase 129Xe NMR imaging and spectroscopy  

E-Print Network (OSTI)

5 l l Dynamic NMR microscopy of gas phase Poiseuille flowmetal vapors and noble gases can be used to efficientlypolarize the nuclei ofthe noble-gas atoms. As a result, the

Kaiser, Lana G.

2010-01-01T23:59:59.000Z

248

Rotational Transition of Incommensurate Kr Monolayers on Graphite  

Science Journals Connector (OSTI)

Synchrotron x-ray diffraction studies of the orientational epitaxy of krypton on single-crystal graphite are reported. The system displays a continuous transition from an aligned to a rotated orientation with increasing mean misfit in a manner predicted by a hexagonal-domain-wall model of the weakly incommensurate phase. A hysteresis at the critical misfit is observed. The results are discussed in light of current views of the structure of the incommensurate phase.

K. L. D'Amico; D. E. Moncton; E. D. Specht; R. J. Birgeneau; S. E. Nagler; P. M. Horn

1984-12-03T23:59:59.000Z

249

Depinning of Atomically Thin Kr Films on Gold  

Science Journals Connector (OSTI)

We have employed the quartz-crystal microbalance technique to measure the sliding friction of krypton films physisorbed on gold. By slowly increasing the amplitude of the substrate oscillations, we have observed a sharp transition from a film locked to the substrate to a sliding one. This transistion is characterized by hysteresis both in dissipation and inertial mass as the amplitude is decreased. Finally, the dependence of this transition on film coverage has been studied in some detail.

L. Bruschi; A. Carlin; G. Mistura

2002-01-14T23:59:59.000Z

250

High-pressure EXAFS measurements of solid and liquid Kr  

Science Journals Connector (OSTI)

X-ray-absorption measurements of liquid and solid krypton at room temperature in the pressure range 0.1–30 GPa have been performed using the dispersive setup and diamond-anvil cells as a pressure device. The evolution of the near-edge structures as a function of pressure, including the first intense resonance, has been interpreted using multiple-scattering calculations. It is shown that the near-edge structures are reproduced taking into account two-body and three-body terms associated with the first-neighbor atoms. Extended x-ray-absorption fine-structure (EXAFS) spectra have been analyzed in the framework a multiple-scattering data-analysis approach taking proper account of the atomic background including the [1s4p], [1s3d], and [1s3p] double-electron excitation channels. Isobaric Monte Carlo (MC) computer simulations based on empirical pair potentials, as proposed by Barker (K2) and Aziz (HFD-B), have been performed to make a quantitative comparison of theoretical and experimental local structural details of condensed krypton at high pressures. From the analysis of EXAFS data we were able to obtain simultaneous information on average distance, width, and asymmetry of the first-neighbor distribution, as a function of pressure. These parameters yield a unique insight on the potential function because they are affected by both minimum position and curvature of the effective pair potential. The trend of the first-neighbor distribution as a function of pressure is in quantitative agreement with the HFD-B potential at moderate pressures, deviations are found at higher pressures where EXAFS spectra are very sensitive to the hard-core repulsive part of the potential. The weak EXAFS signal of liquid krypton at room temperature and 0.75 GPa has been found in accord with the results of the MC simulations within the noise of the measurement. © 1996 The American Physical Society.

A. Di Cicco; A. Filipponi; J. P. Itié; A. Polian

1996-10-01T23:59:59.000Z

251

PLC 149 ekjee@dependable.kaist.ac.kr  

E-Print Network (OSTI)

PLC 149 21 : : 2007 4 11 2008 1 25 : : : ekjee , . , . , , , . : 35 3(2008.3) PLC (A Structural Testing Strategy for PLC Programs Specified by Function Block Diagram) (Eunkyoung Jee) (Seungjae Jeon) (Sungdeok Cha) (PLC: Programmable Logic

Jee, Eunkyoung

252

Hanford Site - 100-KR-4 | Department of Energy  

Office of Environmental Management (EM)

Cr (total) 622 Yes 100 (DWS); 48 (MTCA) Cr-6 3280 Yes 48 (MTCA); 10 (AWQC) Isotope Name Concentration (pCil) Regulatory Driver Cleanup Requirement C-14 9520 Yes 2000...

253

Analysis and Prediction of VH K.R. Abhinandan  

E-Print Network (OSTI)

Institute of Structural and Molecular Biology, Darwin Building, University College London, Gower Street and VL) from the heavy and light chains respectively. The VH/VL interface, which influences the stability Basel, Switzerland. 1 #12;2 Fv region, has been shown to affect the binding kinetics of a peptide

Martin, Andrew C.R.

254

Hyper Logic Programs in SILK: Redefining the KR Playing Field  

E-Print Network (OSTI)

as users · Initial version 2004, then refined extensively and tested rigorously · For recent info, see http://www.ai.sri.com/project/aura #12;6 Another Bit of Inspirational Ancient History ... · "It's the Economy, Stupid!" · Campaign slogan war in 1991, the US economy suffered a recession later in 1991. · E.g., see http://en.wikipedia.org/wiki/It's_the_economy

Polz, Martin

255

Experimental investigation of left-right asymmetry in photon-atom interaction  

E-Print Network (OSTI)

Single ionization of noble gas atoms by linearly polarized synchrotron radiation has been studied by employing angle- and energy-resolved photoelectron spectroscopy. The measurements were carried out in the plane defined by the momentum and polarization vectors of the photon. Parameters describing the left-right asymmetry (LRA) (relative to the photon propagation direction) of the photoelectron angular distribution were determined experimentally for the $s$-shells of He, Ne, Ar, Kr and Xe atoms and H$_2$ molecules and for the $p$-shells of Ne, Ar, Kr and Xe atoms. The values of the left-right asymmetry differ significantly from zero for both subshells. The photon and photoelectron energy dependence of the LRA parameters are presented also. Possible experimental and instrumental sources that could generate asymmetry are discussed and excluded as well.

Ricz, S; Kövér, Á; Holste, K; Borovik,, A; Schippers, S; Varga, D; Müller, A

2015-01-01T23:59:59.000Z

256

Dependence of secondary ion emission from organic material on the energy loss of the impacting heavy ion  

SciTech Connect

Samples of the amino acid valine were irradiated by 2.5 MeV-Ar, 0.8 MeV-Kr and 1.0 MeV Xe beams from the Argonne Dynamitron accelerator in order to study the energy distributions of ejected secondary ions. For Kr and Xe the nuclear stopping power exceeded the electronic stopping power by a factor 2 or 3, respectively, but the functional shape of the energy distributions and the mean ejection energies (0.9--1.4 eV) indicated that the molecular ions (M{plus minus}H){sup {plus minus}} are desorbed by an electronic sputter process. Contributions of atomic collision cascades were observed for the H{sup {minus}} ion. In the second part of the article, the overall dependence of molecular ion yields on the electronic energy loss is discussed in the framework of recent desorption models and the structure of the nuclear track.

Hunt, J.E. (Argonne National Lab., IL (United States)); Wien, K. (Technische Hochschule Darmstadt (Germany). Inst. fuer Kernphysik)

1991-01-01T23:59:59.000Z

257

Record of Cycling Operation of the Natural Nuclear Reactor in the Oklo/Okelobondo Area in Gabon  

Science Journals Connector (OSTI)

Using selective laser extraction technique combined with sensitive ion-counting mass spectrometry, we have analyzed the isotopic structure of fission noble gases in U-free La-Ce-Sr-Ca aluminous hydroxy phosphate associated with the 2 billion yr old Oklo natural nuclear reactor. In addition to elevated abundances of fission-produced Zr, Ce, and Sr, we discovered high (up to 0.03??cm3???STP/g) concentrations of fission Xe and Kr, the largest ever observed in any natural material. The specific isotopic structure of xenon in this mineral defines a cycling operation for the reactor with 30-min active pulses separated by 2.5 h dormant periods. Thus, nature not only created conditions for self-sustained nuclear chain reactions, but also provided clues on how to retain nuclear wastes, including fission Xe and Kr, and prevent uncontrolled runaway chain reaction.

A. P. Meshik; C. M. Hohenberg; O. V. Pravdivtseva

2004-10-27T23:59:59.000Z

258

Ion-beam and electron-beam irradiation of synthetic britholite S. Utsunomiya a  

E-Print Network (OSTI)

on previously amorphized britholite (N56) with an electron flux of 1.07 · 1025 e� /m2 /s. The ionizing radiation resulted in recrystallization at the absorbed dose of 6.2 · 1013 Gy. This result suggests that the ionizingV Kr2þ and 1.5 MeV Xeþ over the temperature range of 50­973 K. The process of ion irradiation

Utsunomiya, Satoshi

259

Direct Photolysis of Chlorophenols In Aqueous Solution By Ultraviolet Excilamps  

SciTech Connect

The direct photolysis of 2-chlorophenol (2-CP), 4-chlorophenol (4-CP) and 2,4-dichlorophenol (2,4-DCP) in model aqueous solution was studied using UV XeBr (282 nm) and KrCl (222 nm) excilamps. The highest pseudo-first order rate constants and quantum yields were found for molecular form of 4-CP (at pH 2 and 5.7) and anionic forms of 2-CP and 2,4-DCP (at pH 11) when irradiated by XeBr excilamp. The maximum removal efficiency of molecular form of 2-CP and 2,4-DCP with the lowest UV dose of absorbed energy was observed using KrCl excilamp. On the contrary, the XeBr excilamp required the lowest dose ({approx}2 J{center_dot}cm{sup -2}) for complete degradation of molecular 4-CP and anionic 2-CP. The highest removal efficiency of anionic form of 4-CP (65%) was achieved when using KrCl excilamp.

Matafonova, Galina; Philippova, Natalya; Batoev, Valeriy [Baikal Institute of Nature Management SB RAS, 6 Sakhyanova St., Ulan-Ude, 670047 (Russian Federation)

2011-08-25T23:59:59.000Z

260

Octatetraene-Xe van der Waals Clusters Bull. Korean Chem. Soc. 2002, Vol. 23, No. 2 195 Fluorescence Excitation Spectroscopy of Octatetraene-Xe van der Waals Clusters  

E-Print Network (OSTI)

a conjugated double bond structure, playing important roles in photobiological systems. Conversion of light conversion of light in biolog- ical systems. Some years ago, this group has reported the role of the rare gas for the molecular interactions among the collision pairs and the solvation dynamics.1,2 Since the rare gas atoms

Kim, Sang Kyu

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While these samples are representative of the content of NLEBeta,
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261

Oscillation spectra of Ar–Xe and He–Ar–Xe mixtures pumpbed by a radially converging electron beam with a pulse length ~ 0.1 ms  

Science Journals Connector (OSTI)

We have investigated lasers oscillating on atomic transitions of xenon and pumped by a radially converging electron beam with pulse lengths between 0.07 and 0.1 ms. We have determined experimentally the dependence of the threshold beam current density and the output spectrum on the Q-factor of the laser resonator. We have shown that for beam current densities smaller than 16 mA/cm2 and for a pulse length ~ 0.1 ms there is a quasisteady lasing at wavelengths ? = 1.73, 2.65, 2.03, and 2.63 ?m if the resonator output mirror and the mixture composition are chosen appropriately. We have also observed simulatenous oscillation on the following pairs of lines: ? = 1.73 and 2.03 ?m, 2.03 and 2.65 ?m, and 2.65 and 2.63 ?m. When the lattice supporting the foil covering the beam window was cooled with water, periodic-pulse operation at a repetition rate of 5 Hz was achieved in a laser with a pumped volume ~ 18 liters.

A S Bugaev; N N Koval'; Viktor F Tarasenko; A V Fedenev

1992-01-01T23:59:59.000Z

262

{tjkim, hyjang}@bi.snu.ac.kr {timothy.park, shwang}@samsung.com btzhang@bi.snu.ac.kr Ensemble Methods with increasing data  

E-Print Network (OSTI)

National University1 DMC R&D Center, Samsung Electronics Co., LTD. 2 . (variance) . . (weak learner: , 1b: , 1c: , 1d: , 2: , 3: ).[7] 1. UNIPEN Category # of Data Accuracy (%) 1a 15953 96.4 1b 28069 91.3 1c 61360 81.2 1d 17286 73.6 2 122668 72.6 3 67352 72.6 . . 4 . , 1 , 2 UNIPEN . . 2013 #12;4. 5

Zhang, Byoung-Tak

263

MARMOT Enhanced | Department of Energy  

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

MARMOT Enhanced MARMOT Enhanced MARMOT Enhanced January 29, 2013 - 10:23am Addthis Lower-length-scale Model Development To develop mechanistic models for fuel thermal conductivity, the Fuel team used supercells up to 55 nm long to determine the thermal conductivity of UO2 with Xe incorporated. Atomistic simulations were used to determine thermal resistance values for four different types of grain boundaries, and these values have been used in meso-scale simulations of heat transport through representative fuel microstructures. [LANL] Density functional theory techniques, previously applied to diffusion of Xe in UO2, have now been extended to Kr. Thus, both major gaseous fission products are now included in the simulations, which have identified the transport mechanism as being vacancy mediated. Activation energies have

264

UTICA 4, NEW YORK COFIPOR~TION  

Office of Legacy Management (LM)

DROf fORGE & TOOL DROf fORGE & TOOL UTICA 4, NEW YORK COFIPOR~TION PHONE 3- 2331 July 5, 1955 ?:r. E. J. Block Director of Production Division United Staton Atomic ::norgy Commission Yiashington, D. C. Dear Xr. 1310~1~: Xe had a visit last Thursday from Kr. R. C. Sale11 of the: Atomic Energy Commission who inspected our vacuum melting facilities. EIz suggested that we should get in touch with you and that you r+ht be interested in the use of our facilities for the i>roduction of uranium fuel elements. Xe have at the present time the largest coxnercial vacuum installation in the country and m have been producin; high tc~poraturc alloys for the aircraft industry for over txro 'years. ;Is have produced to date Over 400,000 pounds of mtal. Our present rate of production is of the order

265

A Design for a Compact Time-of-Flight Mass Spectrometer  

SciTech Connect

The design of a prototype, compact time-of-flight (TOF) mass spectrometer (MS) is described. The system primarily consists of an ion acceleration/focusing/steering assembly (AFSA), an 8 cm field-free region, a 4 cm, dual-stage reflectron and a miniature microchannel plate detector. Consequently, the resulting flight length of the system is 12 cm. The system has been designed with the capability to sample directly from atmosphere at ambient pressures. This is accomplished through the use of an electrodynamic ion funnel, housed in an intermediate-vacuum chamber that is coupled to the inlet of the TOF chamber. TOF spectra were obtained using noble gases (Ar, Kr and Xe) as test chemicals. These measured flight times were used to probe the performance of the instrument. A temporal resolution (tflight/?t) of approximately 125, acquired using 129Xe+, has been measured for the system.

Manard, M.

2012-10-01T23:59:59.000Z

266

MULTI-KEV X-RAY YIELDS FROM HIGH-Z GAS TARGETS FIELDED AT OMEGA  

SciTech Connect

The authors report on modeling of x-ray yield from gas-filled targets shot at the OMEGA laser facility. The OMEGA targets were 1.8 mm long, 1.95 mm in diameter Be cans filled with either a 50:50 Ar:Xe mixture, pure Ar, pure Kr or pure Xe at {approx} 1 atm. The OMEGA experiments heated the gas with 20 kJ of 3{omega} ({approx} 350 nm) laser energy delivered in a 1 ns square pulse. the emitted x-ray flux was monitored with the x-ray diode based DANTE instruments in the sub-keV range. Two-dimensional x-ray images (for energies 3-5 keV) of the targets were recorded with gated x-ray detectors. The x-ray spectra were recorded with the HENWAY crystal spectrometer at OMEGA. Predictions are 2D r-z cylindrical with DCA NLTE atomic physics. Models generally: (1) underpredict the Xe L-shell yields; (2) overpredict the Ar K-shell yields; (3) correctly predict the Xe thermal yields; and (4) greatly underpredict the Ar thermal yields. However, there are spreads within the data, e.g. the DMX Ar K-shell yields are correctly predicted. The predicted thermal yields show strong angular dependence.

Kane, J O; Fournier, K B; May, M J; Colvin, J D; Thomas, C A; Marrs, R E; Compton, S M; Moody, J D; Bond, E J; Davis, J F

2010-11-04T23:59:59.000Z

267

Energy Loss by 8.86-Mev Deuterons and 4.43-Mev Protons  

Science Journals Connector (OSTI)

Using deuterons of average energy 8.86 Mev, the stopping powers relative to air have been measured for the following gases: H2, He, N2, O2, Ne, A, Kr, Xe, CH4, and CO2. Absolute stopping cross sections were measured, using 4.43-Mev protons (of equal velocity) for H2, air, and Kr, and the deuteron results were normalized to give absolute stopping cross sections for all of the gases. Comparison is made with the theoretical results of Aron et al., Walske, and Lindhard and Scharff.It was found that the NaI(Tl) crystal exhibited a nonlinearity in its response curve of light output versus proton or deuteron energy.

J. E. Brolley, Jr. and F. L. Ribe

1955-05-15T23:59:59.000Z

268

Production of Excess Heat Power on the basis of Low Energy Nuclear Reactions (LERN) in the Solid Medium  

SciTech Connect

The experimental data of investigation into low energy nuclear reactions (LERN) in condensed media are presented. The nuclear reactions products were researched in the solid cathode medium of a glow discharge. Hypothetically the nuclear reactions were initiated when bombarding the cathode surface by plasma ions with the energy of 1.0-2.0 keV. The results on recording excess heat power under the experiments with a high-current glow discharge in D{sub 2}, Xe and Kr, when using preliminary deuterium-charged Pd and Ti cathode samples are given. The excess heat power up to 10-15 W and efficiency up to 150 % was recorded under the experiments for Pd cathode samples in D{sub 2} discharge. The excess heat power up to 5 W and efficiency up to 150 % was recorded for the preliminary deuterium-charged Pd cathode samples in Xe and Kr discharges. At the same time the excess heat power was not observed for pure Pd cathode samples in Xe, Kr discharges. Forming the impurity nuclides ({sup 7}Li, {sup 13}C, {sup 15}N, {sup 20}Ne, {sup 29}Si, {sup 44}Ca, {sup 48}Ca, {sup 56}Fe, {sup 57}Fe, {sup 59}Co, {sup 64}Zn, {sup 66}Zn, {sup 75}As, {sup 107}Ag, {sup 109}Ag, {sup 110}Cg, {sup 111}Cg, {sup 112}Cg, {sup 114}Cg, {sup 115}In) with the efficiency up to 10{sup 13} atoms/s was recorded. Large deviation of the registered isotopes relation from the natural relation of these elements isotopes was observed. The soft X-ray radiation from the solid-state cathode medium with the intensity up to 0.01 Gy/s was recorded under the experiments with the discharge in H{sub 2}, D{sub 2}, Ar, Xe, Kr. The X-ray radiation was observed as bursts (up to 10{sup 6} photons in a burst and up to 10{sup 5} bursts a second) during the discharge burning and within 100 ms after turning off the discharge current. The results of the X-ray radiation registration showed that the exited energy levels having the lifetime up to 100 ms and more and the energy of 1.2 - 1.8 keV existed in the solid medium. The possible mechanism of producing the excess heat power and products of nuclear transmutation reactions in the solid medium with the exited energy levels was considered. (author)

Karabut, A.B. [FSUE 'LUCH', 24 Zheleznodorozhnaya St, Podolsk, Moscow Region, 142100 (Russian Federation)

2004-07-01T23:59:59.000Z

269

New Tools for Chemically Directed Glycoproteomics and Xe-based MRI Contrast Agents  

E-Print Network (OSTI)

et al. A novel chemical glycoproteomics platform reveals O-of chemical approaches with existing proteomics platforms

Palaniappan, Krishnan K.

2012-01-01T23:59:59.000Z

270

New Tools for Chemically Directed Glycoproteomics and Xe-based MRI Contrast Agents  

E-Print Network (OSTI)

Q Gradient ultrapure water purification system (Millipore).Q Gradient ultrapure water purification system (Millipore).Q Gradient ultrapure water purification system (Millipore).

Palaniappan, Krishnan K.

2012-01-01T23:59:59.000Z

271

New Tools for Chemically Directed Glycoproteomics and Xe-based MRI Contrast Agents  

E-Print Network (OSTI)

of magnetic and semi- conducting nanowires. Science 303,magnetic resonance hyperpolarized biosensor. Science 314,magnetic resonance hyperpolarized biosensor. Science 314,

Palaniappan, Krishnan K.

2012-01-01T23:59:59.000Z

272

The interactions of high-energy, highly charged Xe ions with buckyballs  

SciTech Connect

Ionization and fragmentation have been measured for C{sub 60} molecules bombarded by highly charged (up to 35+) xenon ions with energies ranging up to 625 MeV. The observed mass distribution of positively charged fragments is explained in terms of a theoretical model indicating that the total interaction cross section contains roughly equal contributions from (a) excitation of the giant plasmon resonance, and (b) large-energy-transfer processes that lead to multiple fragmentation of the molecule. Preliminary results of measurements on VUV photons emitted in these interactions are also presented.

Ali, R.; Berry, H.G.; Cheng, S. [and others

1994-12-31T23:59:59.000Z

273

A Comprehensive Simulation Study of a Liquid-Xe Detector for Contraband Detection  

E-Print Network (OSTI)

Recently, a new detector concept, for combined imaging and spectroscopy of fast-neutrons and gamma was presented. It encompasses a liquid-xenon (LXe) converter-scintillator coupled to a UV-sensitive gaseous Thick Gas Electron Multiplier (THGEM)-based imaging photomultiplier (GPM). In this work we present and discuss the results of a systematic computer-simulation study aiming at optimizing the type and performance of LXe converter. We have evaluated the detector spectral response, detection efficiency and spatial resolution for gamma-rays and neutrons in the energy range of 2-15 MeV for 50 mm thick converters consisting of plain LXe volume and LXe-filled capillaries, of Teflon, Polyethylene or hydrogen-containing Teflon (Tefzel). Neutron detection efficiencies for plain LXe, Teflon-capillaries and Tefzel-capillaries converters were about 20% over the entire energy range. In polyethylene capillaries converters the neutron detection efficiency was about 10% at 2 MeV and increased up to about 20% at 14 MeV. Dete...

Israelashvili, I; Vartsky, D; Arazi, L; Bar, D; Caspi, E N; Breskin, A

2015-01-01T23:59:59.000Z

274

Towards a precision measurement of the half life of neutrinoless double beta decay of 136Xe.  

E-Print Network (OSTI)

??Recent neutrino oscillation experiments provide proof that neutrinos are massive par- ticles, but the absolute neutrino mass scale remains unknown. Observation of neu- trinoless double… (more)

Stanford University, Dept. of Physics

2011-01-01T23:59:59.000Z

275

Electromagnetic dipole strength distribution in $^{124,128,132,134}$Xe below the neutron separation energy  

E-Print Network (OSTI)

Dipole strength functions in the chain of xenon isotopes are analyzed on the basis of photon-scatterde experiments with bremsstrahlung at the ELBE facility in Dresden, Germany, and at the HI S facility in Durham, North Carolina, USA. The evolution of dipole strength with neutron excess and nuclear deformation is studied.

Massarczyk, R; Dönau, F; Frauendorf, S; Bemmerer, D; Beyer, R; Butterling, M; Hannaske, R; Junghans, A; Koegler, T; Rusev, G; Schilling, K D; Schramm, G; Tonchev, A P; Tornow, W; Wagner, A

2014-01-01T23:59:59.000Z

276

Phonon wave-packet simulations of Ar/Kr interfaces for thermal rectification  

E-Print Network (OSTI)

by designing them to have extremely low thermal conductivities in the one direction.4 Thermally rectifying extremely difficult. Materials that exhibit thermal rectification would drastically improve our ability and dissimilar materials which have shown thermal rectify- ing behavior. In 2002, Terraneo et al.6 demonstrated

Walker, D. Greg

277

Elastic scattering of electrons from Ar and Kr in the second-order eikonal approximation  

Science Journals Connector (OSTI)

We report the first application of Baker's second-order eikonal approximation (SOEA) to atomic collisions and compare the predictions of SOEA with those of Glauber's first-order eikonal approximation (FOEA). The SOEA takes into account amplitude modulation, in addition to phase modulation of the incoming plane wave. In the case of elastic scattering of electrons from argon and krypton, it is found that the second-order correction term influences to a large extent the angular distribution of scattered electrons. In the intermediate-and high-energy range it is seen that the SOEA gives much better agreement than the FOEA with the staticfield calculation of Fink and Yates.

A. C. Roy and N. C. Sil

1977-03-01T23:59:59.000Z

278

Total elastic-scattering cross sections for metastable Ar on Kr  

Science Journals Connector (OSTI)

Velocity-dependent total elastic-scattering cross sections are measured for metastable argon scattered from krypton in the velocity range 500 to 5000 m/sec. An interaction potential for the reaction is derived from the data by both a semiclassical analysis and a full quantum calculation. The results are compared with previous measurements.

H. Li; E. S. Gillman; J. W. Sheldon; K. A. Hardy

1992-01-01T23:59:59.000Z

279

Ioniclike energy structure of neutral core-excited states in free Kr clusters  

Science Journals Connector (OSTI)

The development of electronic states in krypton clusters is investigated by high-resolution core-level electron spectroscopy. The energy ordering of bulk versus surface 3d?1np(n>5) core-excited states in neutral clusters is demonstrated to be reversed to the 3d?15p level situation. The cluster 3d?16p,7p states are proven to be at a lower energy than the corresponding atomic levels. These findings reveal the ioniclike energy structure of the neutral cluster core-excited levels. The phenomenon is explained by a spatial spread of the excited orbitals over the cluster lattice.

S. Peredkov; A. Kivimäki; S. L. Sorensen; J. Schulz; N. Mårtensson; G. Öhrwall; M. Lundwall; T. Rander; A. Lindblad; H. Bergersen; S. Svensson; O. Björneholm; M. Tchaplyguine

2005-08-11T23:59:59.000Z

280

Market-Based Incentives for Green Building Alternatives K.R. Grosskopf, Ph.D.1  

E-Print Network (OSTI)

-based incentives for adaptation of water-saving, green building alternatives and a new international program is introduced wherein the water supplier can create "optimal" market-based incentives for consumer investment for Collective Protection, University of Florida, 336 Rinker Hall, Gainesville, Florida, USA, 32611-5703. 1

Jawitz, James W.

Note: This page contains sample records for the topic "uus kr xe" 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.


281

Microsoft Word - LATEST_Final Report_KR_v03_2_22.doc  

Office of Scientific and Technical Information (OSTI)

fired heaters, and power generation equipment but Excludes the F-T synthesis & upgrading units in both cases. Due to the high cost of the Air Separation Unit and the...

282

{hschun, whchoe, btzhang}@bi.snu.ac.kr Probabilistic Estimation of Emotion using Color Distribution  

E-Print Network (OSTI)

. . . , . . . . . () (NRF- 2010-0017734-Videome), () (KEIT- 10035348-mLife, KEIT-10044009) . [1] M. Hemphill, "A note, "Color, environment, human response", New York: Van Nostrand Reinhold, 1996. [3] L. D. Giannetti", Palo Alto: Consulting Psychologists Press, 1978. [5] W. H. Choe, H.-S. Chun, J. Noh, S.-D. Lee & B.- T

Zhang, Byoung-Tak

283

Characterization of the thermal dependence of bioengineered glufosinate resistance in cotton. Dawson, K.R.1,  

E-Print Network (OSTI)

Characterization of the thermal dependence of bioengineered glufosinate resistance in cotton isolated from glufosinate resistant cotton. The thermal dependencies of the Km of PAT for glufosinate the thermal dependence of the bioengineered glufosinate resistance in cotton will be determined. #12;

Mukhtar, Saqib

284

Quantum control of I2 in the gas phase and in condensed phase solid Kr matrix  

E-Print Network (OSTI)

, University of California, San Diego, La Jolla, California 92093-0339 V. A. Apkarian, C. C. Martens, and R ultrafast light pulses; and a static control scheme, due to Brumer and Shapiro,4 that uses two or more cw,51 The Brumer-Shapiro sch

Apkarian, V. Ara

285

mse.postech.ac.kr M A T E R I A L S  

E-Print Network (OSTI)

Structural Materials, Electronic Materials for Information Technologies, Energy and Environmental Materials Nurture Future Global Leaders World-Leading Research Technology The Best Education Programs & Research Facilities The Times Higher Education

Sung, Wokyung

286

2001 8 1 e-mail: cosmos, csshin@gaebyok.wonkwang.ac.kr  

E-Print Network (OSTI)

Distributed Computing Environment. Won-Jung Lee * , Chang-Sun Shin * , Su-Chong Joo * *Dept. of Computer

Joo, Su-Chong

287

Sequential and spontaneous star formation around the mid-infrared halo H II region KR 140  

Science Journals Connector (OSTI)

......Catalog (2MASS PSC) using the online gator query tool at the Infrared Science Archive...The 2MASS PSC was queried using the gator software at IRSA. All of the catalogue...A-D][A-D][A-D] in sql used by gator. This research has made extensive use......

C. R. Kerton; K. Arvidsson; Lewis B. G. Knee; C. Brunt

2008-04-01T23:59:59.000Z

288

Optical logic gates and its application e-mail : slee@kist.re.kr  

E-Print Network (OSTI)

recognition system, label / payload separation system, gray code to BCD converter, binary counter, parity bit] [9] [8]* ETC Gray code to BCD converter Binary counter Parity bit checker Encryption system Flip . gray code to BCD converter, binary counter, parity bit checker, encryption system, Flip-flop memory

Park, Namkyoo

289

All optical gray code to BCD converter e-mail : nkpark@plaza.snu.ac.kr  

E-Print Network (OSTI)

[. 1] / [ 2] / All optical gray code to BCD converter *1) , 2) , 2) , 2) , 1) 1) , 2 to binary-coded-decimal (BCD) converter for the first time in our knowledge utilizing cross gain modulations-level-simplification-method that has been used in electronics, we successfully designed the 4-bit all-optical Gray- code to BCD

Park, Namkyoo

290

Ohmyoung Kwon1 e-mail: omkwon@wow.hongik.ac.kr  

E-Print Network (OSTI)

This paper presents a new non-destructive evaluation NDE technique of imaging sub-surface structure- dimensional micro and nanoengineered devices are developed in the future, the demand for the NDE technique at much slower speeds than sound waves which is commonly used in NDE at large scales. Hence, for a given

Shi, Li

291

Numerical study and validation of one swirling flame , Sren K. Kr, Chungen Yin  

E-Print Network (OSTI)

Department of Energy Technology Aalborg University, Pontoppidanstræde 101, 9220 Aalborg, Denmark Abstract) methods show different flow patterns in isothermal and reacting case. The influence of heat release@et.aau.dk Proceedings of the European Combustion Meeting 2011 based on a bluff-body burner. Central jet tube is 3.6 mm

Berning, Torsten

292

Xenon(IV)–Carbon Bond of [C6F5XeF2]+; Structural Characterization and Bonding of [C6F5XeF2][BF4], [C6F5XeF2][BF4]·2HF, and [C6F5XeF2][BF4]·nNCCH 3 (n = 1, 2); and the Fluorinating Properties of [C6F5XeF2][BF4  

Science Journals Connector (OSTI)

We thank the Natural Sciences and Engineering Research Council of Canada for support in the form of a Discovery Grant (G.J.S.), the Deutsche Forschungsgemeinschaft and the Fonds der Chemischen Industrie for support in the form of research grants (H.-J.F.), the Ontario Ministry of Training, Colleges, and Universities for graduate scholarships (J.H.), and SHARCNet (Shared Hierarchical Academic Research Computing Network; www.sharcnet.ca ... Levy, H. A.; Burns, J. H.; Agron, P. A. Science 1963, 139, 1208– 1209 ...

Karsten Koppe; Jamie Haner; Hélène P. A. Mercier; Hermann-J. Frohn; Gary J. Schrobilgen

2014-10-20T23:59:59.000Z

293

Recoil tritium reaction in rare gas-ethane solid mixtures at ultralow temperature  

SciTech Connect

Recoil T atom reactions have been studied in Ar (or Kr or Xe)-C/sub 2/H/sub 6/-D/sub 2/D/sub 6/ mixtures at 11-20 and 77 K. The relative yields of hydrogen (HT + DT) increase with a decrease of ethane concentration, while those of ethane (C/sub 2/H/sub 5/T + C/sub 2/D/sub 5/T) decrease complementarily. The results indicate that hydrogen is formed by both hot and thermal T atoms, while ethane is formed only by the hot T atoms. The thermal T atoms abstract hydrogen from ethane by quantum mechanical tunneling even at 11-20 K as well as 77 K. The H/D abstraction isotope effect for the thermal T atom reaction with C/sub 2/H/sub 6/ and C/sub 2/D/sub 6/ was measured at 0.2 mol % ethane in rare gas solid. The isotope effects in Ar are 1.0 at 77 K and 3.9 at 18 K, whereas those in Xe are 4.4 at 77 K and 1.0 at 20 K. The isotope effects in Kr are 1.9 at 77 K and 1.1 at 11 K. The average energy loss of hot T atoms in rare gas solid was estimated and compared with that in the gas phase.

Lee, K.P.; Ito, Y.; Fujitani, Y.; Miyazaki, T.; Fueki, K.; Aratono, Y.; Saeki, M.; Tachikawa, E.

1986-10-09T23:59:59.000Z

294

Anomalous laser-induced ionization rates of molecules and rare-gas atoms  

SciTech Connect

Electron tunnel ionization is considered as the mechanism for producing free electrons in gases under laser radiation. The Keldysh result and the Ammosov-Delone-Krainov (ADK) formulation are amended by considering the excess forces due to the interaction of the electric field of the laser with the electron cloud in a simple mass-on-a-spring approximation. The result of this excess force is a kinetic energy that is directed along the polarization vector of the laser field and an induced potential energy that are proposed as a determining factor in electron tunnel ionization. Relative ionization rates for various pairs of gases are calculated and compared with reported figures. Comparisons were made between several combinations of O{sub 2}, Xe, Ar, N{sub 2}, Cl{sub 2}, H{sub 2}, CO, Kr, NO, F{sub 2}, and D{sub 2}. Predicted ratios of ionization rates between pairs of gases are compared to ADK predictions. Apparently anomalous ionization rates of O{sub 2}, D{sub 2}, and H{sub 2} are explained. A simple expression is developed that reveals why the ionization rate of Xe is about an order of magnitude larger than that of O{sub 2} even though their ionization potentials are nearly identical; why CO is only about half that of Kr even though their ionization potentials are nearly the same; why the ratio of O{sub 2} to O is about ten times larger than predicted by ADK; and why the ratio of NO to Xe is about an order of magnitude less than predicted by ADK.

Bettis, Jerry Ray [5701 Woodlake Drive, Stillwater, Oklahoma 74074 (United States)

2009-12-15T23:59:59.000Z

295

Pressure dependence of the solubility of nitrogen, argon, krypton, and xenon in water  

Science Journals Connector (OSTI)

Measurements are reported for the pressure dependence of the Ostwald L and mole?fraction x 2solubilities for nitrogen argon krypton and xenon in water at 25.0?°C. The approximate pressure ranges were: N2 44–116 atm; Ar 22–101 atm; Kr 33–81 atm; and Xe 5–48 atm. Our experimental technique is a modified Van Slyke method which allows the simultaneous determination of L x 2 and partial molar volume v 2 of the solute gas in the solvent. For N2 Ar and Kr we observe deviations from Henry’s Law f 2=k H x 2 which vary linearly with pressure. For example the measured values of Henry’s constant range from k H (25?°C 44.6 atm)=90?269 atm to k H (25?°C 115.8 atm)=100?340 atm for N2 in water. Extrapolation of the data to low pressure yields results for L and x 2 which agree with literature values. For Xe we observe a sharp increase in Henry’s constant at pressures above 20 atm. The measured partial molar volume also changes sharply from 47 to ?125 cm3/mol. This is attributed to the observed onset of ice?like clathrates at pressures above 20 atm. The solubility data are analyzed in terms of the Kirkwood–Buff solution theory and the role of hydrophobic interactions is discussed. For the Kr–water system we compare the experimental results to recent computer simulations. We also use statistical mechanics arguments to introduce a new solubility parameter which is useful in understanding high?pressure measurements. We conclude by discussing extensions of this work to other gas–liquid systems.

Richard P. Kennan; Gerald L. Pollack

1990-01-01T23:59:59.000Z

296

Non-dipole effects in photoelectron angular distributions for rare gas atoms  

SciTech Connect

The authors present a theoretical study of O(ka) and O(k{sup 2}a{sup 2}) corrections to the dipole approximation in photoionization of rare gas atoms, where k is the magnitude of the photon wave vector and a is the radius of the ionized subshell. In the dipole approximation, the photoelectron angular distribution is characterized by the single parameter {Beta}. The O(ka) corrections are characterized by two parameters {gamma} and {delta}, and the O(k{sup 2}a{sup 2}) corrections are characterized by three parameters {lambda}, {mu}, and {nu}, constrained by the relation {lambda} + {mu} + {nu} = 0 and a correction {Delta}{Beta} to the dipole parameter {Beta}. Formulas are given for the non-dipole parameters in terms of reduced matrix elements of electric and magnetic multipole operators. Tables and graphs of the seven angular distribution parameters, calculated in the relativistic independent-particle approximation (IPA), are given for electron energies ranging from 20 to 5,000 eV for all 41 subshells of the rare gas atoms He,NE,Ar,Kr, and Xe. Tables and graphs of the O(ka) parameters are also given in the energy range 2--60 eV for the n = 3 and 4 shells of Kr, and for the n = 4 and 5 shells of Xe, where interesting non-dipole effects are found. Comparisons of the IPA calculations with correlated relativistic random-phase approximation calculations are made for selected subshells of Ar and Kr, illustrating the influence of correlation on the non-dipole parameters.

Derevianko, A.; Johnson, W.R.; Cheng, K.T.

1999-11-01T23:59:59.000Z

297

Spectroscopic Diagnostics of Barrier Discharge Plasmas in Mixtures of Zinc Diiodide with Inert Gases  

SciTech Connect

The spectral characteristics of the emission of gas discharge atmospheric pressure plasmas in mixtures of zinc diiodide vapor with inert gases (He, Ne, Ar, Kr, and Xe) are investigated. The formation of a gas discharge plasma and the excitation of the components of a working mixture were performed in a high-frequency (with a repetition frequency of sinusoidal voltage pulses of 100 kHz) barrier discharge. The gas discharge emission was analyzed in the spectral range 200-900 nm with a resolution of 0.05 nm. Emission bands of ZnI(B-X) exciplex molecules and I*{sub 2} excimer molecules, lines of inert gases, and emission bands of XeI* exciplex molecules (in Xe-containing mixtures) were revealed. It is ascertained that the strongest emission of ZnI* molecules is observed in ZnI{sub 2}/He(Ne) mixtures. The regularities in the spectral characteristics of the gas discharge plasma emission are considered.

Guivan, N.N.; Malinin, A.N. [Uzhgorod National University, Uzhgorod, 88000 (Ukraine)

2005-11-15T23:59:59.000Z

298

Quantity of 135I Released from the AGR 1, AGR 2, and AGR 3/4 Experiments and Discovery of 131I at the FPMS Traps during the AGR-3/4 Experiment  

SciTech Connect

A series of three Advanced Gas Reactor (AGR) experiments have been conducted in the Advanced Test Reactor (ATR) at Idaho National Laboratory (INL). From 2006 through 2014, these experiments supported the development and qualification of the new U.S. tristructural isotropic (TRISO) particle fuel for Very High Temperature Reactors (VHTR). Each AGR experiment consisted of multiple fueled capsules, each plumbed for independent temperature control using a mix of helium and neon gases. The gas leaving a capsule was routed to individual Fission Product Monitor (FPM) detectors. For intact fuel particles, the TRISO particle coatings provide a substantial barrier to fission product release. However, particles with failed coatings, whether because of a minute percentage of initially defective particles, those which fail during irradiation, or those designed to fail (DTF) particles, can release fission products to the flowing gas stream. Because reactive fission product elements like iodine and cesium quickly deposit on cooler capsule components and piping structures as the effluent gas leaves the reactor core, only the noble fission gas isotopes of Kr and Xe tend to reach FPM detectors. The FPM system utilizes High Purity Germanium (HPGe) detectors coupled with a thallium activated sodium iodide NaI(Tl) scintillator. The HPGe detector provides individual isotopic information, while the NaI(Tl) scintillator is used as a gross count rate meter. During irradiation, the 135mXe concentration reaching the FPM detectors is from both direct fission and by decay of the accumulated 135I. About 2.5 hours after irradiation (ten 15.3 minute 135mXe half lives) the directly produced 135mXe has decayed and only the longer lived 135I remains as a source. Decay systematics dictate that 135mXe will be in secular equilibrium with its 135I parent, such that its production rate very nearly equals the decay rate of the parent, and its concentration in the flowing gas stream will appear to decay with the parent half life. This equilibrium condition enables the determination of the amount of 135I released from the fuel particles by measurement of the 135mXe at the FPM following reactor shutdown. In this paper, the 135I released will be reported and compared to similar releases for noble gases as well as the unexpected finding of 131I deposition from intentional impure gas injection into capsule 11 of experiment AGR 3/4.

Dawn Scates

2014-09-01T23:59:59.000Z

299

Laser excited, state detected calcium?rare gas collisional energy transfer: Ca(4s5p? 1 P 1) spin changing and Ca(4s5p? 3 P 1) fine structure changing cross sections  

Science Journals Connector (OSTI)

Pulsed dye laser excitation along with time and wavelength?resolved fluorescence detection techniques are used to measure cross sections for state changing collisions of Ca(4s5p? 1 P 1) and Ca(4s5p? 3 P 1) with the rare gases He Ne Ar Kr and Xe. The Ca(4s5p? 1 P 1)+M deactivation involves a near?resonant spin changing process which populates predominantly the Ca(4s5p? 3 P 2 1 0) states. The total deactivation cross sections for 1 P 1 are 22 25 5 3 13 and 31 Å2 (±20%) for 3He 4He Ne Ar Kr and Xe respectively. The cross sections for Ca(4s5p? 3 P 1)+M fine?structure changes are 38 25 46 56 and 135 Å2 (±35%) for He Ne Ar Kr and Xe respectively. Branching ratios for the electronic energy transfer Ca(4s5p? 1 P 1)+He?Ca(4s5p? 3 P j 3d4p? 3 F j and 3d4p? 1 D 2)+He are determined to be 90±3:6±4:3±2 respectively compared to statistical values of 26:60:14. The predominant product states 4s5p 3 P 2 1 0 are produced by a near?resonant spin changing process; the fine structure components of the 3 P state are populated essentially statistically (55:33:11). Fine?structure branching Ca(4s5p? 3 P 1)+M?Ca(4s5p? 3 P 2 0)+M is also measured and gives a statistical distribution of Ca(4s5p? 3 P 2 0) states. The radiative lifetimes of the 4s5p? 1 P 1 and 4s5p? 3 P 1 levels are measured to be 65±2 and 71±8 ns respectively. The results are discussed in terms of the competing effects of velocity and interaction strengths on the curve crossing probabilities.

Michael O. Hale; Stephen R. Leone

1983-01-01T23:59:59.000Z

300

Ion-ion neutralization of iodine in radio-frequency inductive discharges of Xe and I2 mixtures  

E-Print Network (OSTI)

. There is a considerable body of research investigating rare gas- halogen kinetics in the context of atmospheric pressure. The plasma is sustained in an 3.8 cm i.d. by 7.6-cm- long quartz tube. The excitation coil is a solenoid, and having eight and three-quarters turns. Variable rf power is supplied to the sys- tem at 11.3 MHz. Iodine

Kushner, Mark

Note: This page contains sample records for the topic "uus kr xe" from the National Library of EnergyBeta (NLEBeta).
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301

Measurement of a magnetic-dipole transition probability in Xe32+ using an electron-beam ion trap  

E-Print Network (OSTI)

D2 5D3 M1 transition of interest at 413.94 nm Measurement of a magnetic-dipol using an electron-bea F. G. Serpa,* C. A. Morgan, E Atomic Physics Division, National Institute of Standard E. Tr Experimentalphysik III, Ruhr-Universit D. A.... Sugar, J. Opt. Soc. Am. B 8, 3 ~1991!. @8# C.A. Morgan, F.G. Serpa, E. Taka?cs, E.S. Meyer, J.D. Gillaspy, J. Sugar, J.R. Roberts, C.M. Brown, and U. Feldman, Phys. Rev. Lett. 74, 1716 ~1995!. @9# F.G. Serpa, E.S. Meyer, C.A. Morgan, J.D. Gillaspy...

Serpa, F. G.; Morgan, C. A.; Meyer, E. S.; Gillaspy, J. D.; Trabert, E.; Church, David A.; Takacs, E.

1997-01-01T23:59:59.000Z

302

Neutrinoless Double Beta Decay of Ge76, Se82, Mo100 and Xe136 to excited 0^+ states  

E-Print Network (OSTI)

The neutrinoless double beta decay transition to the first excited 0^+ collective final state is examined for A=76, 82, 100 and 136 nuclei by assuming light and heavy Majorana neutrino exchange mechanisms as well as the trilinear R-parity violating contributions. Realistic calculations of nuclear matrix elements have been performed within the renormalized quasiparticle random phase approximation. Transitions to the first excited two-quadrupole phonon 0^+ state are described within a boson expansion formalism and alternatively by using the operator recoupling method. We present the sensitivity parameters to different lepton number violating signals, which can be used in planning the neutrinoless double beta decay experiments. The half-life of neutrinoless double beta decay to the first excited state 0^+_1 is by a factor of 10 to 100 larger than that of the transition to the ground state.

F. Simkovic; M. Nowak; W. A. Kaminski; A. A. Raduta; Amand Faessler

2001-07-06T23:59:59.000Z

303

Measurement of the Double-Beta Decay Half-life of 136Xe in KamLAND-Zen  

E-Print Network (OSTI)

by fallout from the Fukushima-I reactor accident in Marchof detector materials by Fukushima fallout, which includeCo are not detected near Fukushima or our soil samples, we

Gando, A.

2013-01-01T23:59:59.000Z

304

Microsoft Word - Final CSERD Ch 7.doc  

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

7-1 7-1 7.0 GLOSSARY AND ACRONYMS ACRONYM OR TERM DEFINITION µg/m 3 microgram per cubic meter µg/mL microgram per milliliter 132 Xe Xenon 132 1-hour average ozone concentrations the EPA air quality standard for ozone is 0.12 part per million for a 1-hour average 20 Ne Neon 20 36 Ar Argon 36 84 Kr Krypton 84 8-hour average ozone concentrations the EPA air quality standard for ozone, designed to protect public health with an adequate margin of safety, is 0.085 parts per million (ppm), averaged over 8 hours ac acres ACHP Advisory Council on Historic Preservation AEP American Electric Power afforestation the conversion of bare or cultivated land into forest AGR acid gas removal AHPA Archeological and Historic Preservation Act AIH American Institute of Hydrology

305

Noble Gas Geochemistry In Thermal Springs | Open Energy Information  

Open Energy Info (EERE)

Geochemistry In Thermal Springs Geochemistry In Thermal Springs Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Noble Gas Geochemistry In Thermal Springs Details Activities (1) Areas (1) Regions (0) Abstract: The composition of noble gases in both gas and water samples collected from Horseshoe Spring, Yellowstone National Park, was found to be depth dependent. The deeper the sample collection within the spring, the greater the enrichment in Kr, Xe, radiogenic 4He, and 40Ar and the greater the depletion in Ne relative to 36Ar. The compositional variations are consistent with multi-component mixing. The dominant component consists of dissolved atmospheric gases acquired by the pool at the surface in contact with air. This component is mixed in varying degree with two other

306

External Photoevaporation of the Solar Nebula: Jupiter's Noble Gas Enrichments  

E-Print Network (OSTI)

We present a model explaining elemental enrichments in Jupiter's atmosphere, particularly the noble gases Ar, Kr, and Xe. While He, Ne and O are depleted, seven other elements show similar enrichments ($\\sim$3 times solar, relative to H). Being volatile, Ar is difficult to fractionate from ${\\rm H}_{2}$. We argue that external photoevaporation by far ultraviolet (FUV) radiation from nearby massive stars removed ${\\rm H}_{2}$, He, and Ne from the solar nebula, but Ar and other species were retained because photoevaporation occurred at large heliocentric distances where temperatures were cold enough ($\\lt 30$ K) to trap them in amorphous water ice. As the solar nebula lost H it became relatively and uniformly enriched in other species. Our model improves on the similar model of Guillot \\& Hueso (2006). We recognize that cold temperatures alone do not trap volatiles; continuous water vapor production also is necessary. We demonstrate that FUV fluxes that photoevaporated the disk generated sufficient water va...

Monga, Nikhil

2014-01-01T23:59:59.000Z

307

Large-scale purification of single-wall carbon nanotubes prepared by electric arc discharge  

Science Journals Connector (OSTI)

High-yield single-wall carbon nanotubes (SWNTs) have been mass-produced by dc arc discharge evaporation of a carbon electrode including 1 at.% Fe catalyst in hydrogen mixed gas [i.e., H2–inert gas (Ne, Ar, Kr, Xe), or H2–N2]. The as-grown \\{SWNTs\\} have high-crystallinity due to the high temperature of arc plasma, and the coexisting Fe catalyst nanoparticles are embedded in very thin amorphous carbon because of the in situ etching effects of hydrogen. A macroscale purification technique, which is a whole liquid-phase purification process, first reflux treatment in H2O2 solution and then rinsing with hydrochloric acid, has been developed to eliminate the coexisting Fe catalyst nanoparticles and obtain \\{SWNTs\\} with purity higher than 90 at.%.

Xinluo Zhao; Masato Ohkohchi; Sakae Inoue; Tomoko Suzuki; Takenori Kadoya; Yoshinori Ando

2006-01-01T23:59:59.000Z

308

Exposure of nuclear track emulsion to thermal neutrons, heavy ions and muons  

E-Print Network (OSTI)

Physical analysis of exposures of test samples of reproduced nuclear track emulsion (NTE) is presented. In boron enriched NTE the angular and energy correlations of products of the reaction induced by thermal neutrons n$_{th} + ^{10}B \\rightarrow ^{7}Li + (\\gamma) + \\alpha$ are studied. NTE was exposed to ions $^{86}Kr^{+17}$ and $^{124}Xe^{+26}$ of energy about 1.2 A MeV. Measurements of the heavy ion ranges of in NTE allowed one to determine their energy on a basis of the SRIM model. Nuclear stars of large multiplicity of target nuclei are observed in exposure of NTE to ultrarelativistic $\\mu$-mesons. The kinematical characteristics of the events of splitting of carbon nuclei into three $\\alpha$-particles studied in this exposure point to a nuclear diffractive mechanism of interactions.

D. A. Artemenkov; V. Bradnova; A. A. Zaitsev; P. I. Zarubin; I. G. Zarubina; R. R. Kattabekov; K. Z. Mamatkulov; V. V. Rusakova

2014-07-17T23:59:59.000Z

309

Plasma focus ion beam fluence and flux—For various gases  

Science Journals Connector (OSTI)

A recent paper derived benchmarks for deuteron beam fluence and flux in a plasma focus (PF) [S. Lee and S. H. Saw Phys. Plasmas 19 112703 (2012)]. In the present work we start from first principles derive the flux equation of the ion beam of any gas; link to the Lee Model code and hence compute the ion beam properties of the PF. The results show that for a given PF the fluence flux ion number and ion current decrease from the lightest to the heaviest gas except for trend-breaking higher values for Ar fluence and flux. The energy fluence energy flux power flow and damage factors are relatively constant from H2 to N2 but increase for Ne Ar Kr and Xe due to radiative cooling and collapse effects. This paper provides much needed benchmark reference values and scaling trends for ion beams of a PF operated in any gas.

S. Lee; S. H. Saw

2013-01-01T23:59:59.000Z

310

On the ratio of the shear viscosity to the density of entropy of the rare gases and , and  

Science Journals Connector (OSTI)

Abstract The ratio ? of the shear viscosity ? to the volume density of entropy s , ? = ? / s , of the rare gases He, Ne, Ar, Kr, and Xe and the molecules H 2 , N 2 , CH 4 , and CF 4 is studied in the critical region. It is shown that the minimum value ? m of ? / s is observed in the vicinity of the critical point. In addition the universal inequality ? ? ? / ( 4 ? k ) proposed by Kovtun, Son, and Starinets [Phys. Rev. Lett. 94 (2005) 111601] holds for these gases. For the rare gases and 6Li ? m depends linearly on m 1 / 2 ? 2 , where m is the mass and ? defined via the potential energy function as U ( ? ) = 0 . ? m of the molecules H 2 , N 2 , CH 4 , and CF 4 falls on the same straight line provided that the vibrational and rotational contributions to the entropy density s are removed.

U. Hohm

2014-01-01T23:59:59.000Z

311

Metal-insulator transition in rare-gas-alkali-metal thin films  

Science Journals Connector (OSTI)

We report measurements of the conductivity and optical absorption in KrRb and XeCs thin films through the composition range spanning the metal-insulator transition. It is argued from chemical properties of the constituents that the conductivity loss must take the form of a percolative transition. In agreement with this assignment, the optical absorption shows no discontinuous or even marked change through the transitions. "Metallic" and "excitonic" features both persist on each side of the observed transitions in the two systems. The resistivity in metal-rich alloys yields residual resistivities for rare-gas impurities close to the values expected of vacancies, and the resistivity transitions at ? 75 at.% rare gas conform rather closely to the prediction of percolation theory.

D. J. Phelps and C. P. Flynn

1976-12-15T23:59:59.000Z

312

Accurate transition rates for the 5p-5s transitions in KrI Krzysztof Dzierzega,1,2  

E-Print Network (OSTI)

of other experiments used thermal plasma sources, either wall- stabilized electric arcs in the experiments in neutral krypton atoms. The measurements were made with a wall-stabilized electric arc and a 2-m mono- chromator for the spectral lines in the visible, and with a hollow cathode lamp and the NIST 2-m Fourier

313

Quantum Mechanics II Set 4 Due Oct. 7, 2008 (http://beauty.phys.pusan.ac.kr/qmg/fall08)  

E-Print Network (OSTI)

. 3. The potential energy of the electron in hydrogen atom is given as V (r) = - 3e2 80 R3 R2 - 1 3r2 if r R ( a0), - e2 40 1 r if r > R (2) (a) Find the first order energy correction to the state for a 0) for |x| energy and wavefunctions, when V0

Hong, Deog Ki

314

Impulse coupling to targets in vacuum by KrF, HF, and CO/sub 2/ single-pulse lasers  

SciTech Connect

We present a laser-target scaling model which permits approximate prediction of the dependence of ablation pressure, mechanical coupling coefficient, and related parameters in vacuum upon single-pulse laser intensity (I), wavelength (lambda), and pulse width (tau) over extremely broad ranges. We show that existing data for vacuum mechanical coupling coefficient for metallic and endothermic nonmetallic, surface-absorbing planar targets follows this empirical trend to within a factor of 2 over 7 orders of magnitude in the product (Ilambda(tau)/sup 1/2/). The comparison we present is valid for intensity equal to or greater than the peak-coupling intensity I/sub max/, where dense

Phipps C.R. Jr.; Turner, T.P.; Harrison, R.F.; York, G.W.; Osborne, W.Z.; Anderson, G.K.; Corlis, X.F.; Haynes, L.C.; Steele, H.S.; Spicochi, K.C.; and others

1988-08-01T23:59:59.000Z

315

Production yields of noble-gas isotopes from ISOLDE UC$_{x}$/graphite targets  

E-Print Network (OSTI)

Yields of He, Ne, Ar, Kr and Xe isotopic chains were measured from UC$_{x}$/graphite and ThC$_{x}$/graphite targets at the PSB-ISOLDE facility at CERN using isobaric selectivity achieved by the combination of a plasma-discharge ion source with a water-cooled transfer line. %The measured half-lives allowed %to calculate the decay losses of neutron-rich isotopes in the %target and ion-source system, and thus to obtain information on the in-target %productions from the measured yields. The delay times measured for a UC$_x$/graphite target allow for an extrapolation to the expected yields of very neutron-rich noble gas isotopes, in particular for the ``NuPECC reference elements'' Ar and Kr, at the next-generation radioactive ion-beam facility EURISOL. \\end{abstract} \\begin{keyword} % keywords here, in the form: keyword \\sep keyword radioactive ion beams \\sep release \\sep ion yields \\sep ISOL (Isotope Separation On-Line) \\sep uranium and thorium carbide targets. % PACS codes here, in the form: \\PACS code \\sep code...

Bergmann, U C; Catherall, R; Cederkäll, J; Diget, C A; Fraile-Prieto, L M; Franchoo, S; Fynbo, H O U; Gausemel, H; Georg, U; Giles, T; Hagebø, E; Jeppesen, H B; Jonsson, O C; Köster, U; Lettry, Jacques; Nilsson, T; Peräjärvi, K; Ravn, H L; Riisager, K; Weissman, L; Äystö, J

2003-01-01T23:59:59.000Z

316

Adaptation of gas tagging for failed fuel identification in light water reactors  

SciTech Connect

This paper discusses experience with noble gas tagging and its adaptation to commercial reactors. It reviews the recent incidence of fuel failures in light water reactors, and methods used to identify failures, and concludes that the on-line technique of gas tagging could significantly augment present flux tilting, sipping and ultrasonic testing of assemblies. The paper describes calculations on tag gas stability in-reactor, and tag injection tests that were carried out collaboratively with Commonwealth Edison Company in the Byron-2 pressurized water reactor (P%a) and with Duke Power Company and Babcock and Wilcox Fuel Company in the Oconee-2 PWM. The tests gave information on: (a) noble gas concentration dynamics as the tag gases were dissolved in and eventually removed from subsystems of the RCS; and (b) the suitability of candidate Ar, Ne, Kr and Xe isotopes for tagging PWR fuel. It was found that the activity of Xe{sup 125} (the activation product of the tag isotope Xe{sup 124}) acted as a ``tag of a tag`` and tracked gas through the reactor; measured activities are being used to model gas movement in the RCS. Several interference molecules (trace contaminants normally present at sub-ppM concentrations in RCS samples) and entrained air in the RCS were found to affect mass spectrometer sensitivity for tag isotopes. In all instances the contaminants could be differentiated from the tag isotopes by operating the mass spectrometer at high resolution (2500). Similarly, it was possible to distinguish all the candidate tag gases against a high background of air. The test results suggested, however, that for routine analysis a high resolution static mass spectrometer will be preferable to the dynamic instrument used for the present analyses.

Lambert, J.D.B.; Gross, K.C.; Depiante, E.V. [Argonne National Lab., IL (United States); Callis, E.L. [Los Alamos National Lab., NM (United States); Egebrecht, P.M. [Commonwealth Edison Company, Downers Grove, IL (United States)

1996-03-01T23:59:59.000Z

317

A method for direct, semi-quantitative analysis of gas phase samples using gas chromatography-inductively coupled plasma-mass spectrometry  

SciTech Connect

A new and complete GC–ICP-MS method is described for direct analysis of trace metals in a gas phase process stream. The proposed method is derived from standard analytical procedures developed for ICP-MS, which are regularly exercised in standard ICP-MS laboratories. In order to implement the method, a series of empirical factors were generated to calibrate detector response with respect to a known concentration of an internal standard analyte. Calibrated responses are ultimately used to determine the concentration of metal analytes in a gas stream using a semi-quantitative algorithm. The method was verified using a traditional gas injection from a GC sampling valve and a standard gas mixture containing either a 1 ppm Xe + Kr mix with helium balance or 100 ppm Xe with helium balance. Data collected for Xe and Kr gas analytes revealed that agreement of 6–20% with the actual concentration can be expected for various experimental conditions. To demonstrate the method using a relevant “unknown” gas mixture, experiments were performed for continuous 4 and 7 hour periods using a Hg-containing sample gas that was co-introduced into the GC sample loop with the xenon gas standard. System performance and detector response to the dilute concentration of the internal standard were pre-determined, which allowed semi-quantitative evaluation of the analyte. The calculated analyte concentrations varied during the course of the 4 hour experiment, particularly during the first hour of the analysis where the actual Hg concentration was under predicted by up to 72%. Calculated concentration improved to within 30–60% for data collected after the first hour of the experiment. Similar results were seen during the 7 hour test with the deviation from the actual concentration being 11–81% during the first hour and then decreasing for the remaining period. The method detection limit (MDL) was determined for the mercury by injecting the sample gas into the system following a period of equilibration. The MDL for Hg was calculated as 6.8 ?g · m{sup ? 3}. This work describes the first complete GC–ICP-MS method to directly analyze gas phase samples, and detailed sample calculations and comparisons to conventional ICP-MS methods are provided.

Carter, Kimberly E.; Gerdes, Kirk

2013-07-01T23:59:59.000Z

318

Radiochemistry as a (rho)R Diagnostic with the RAGS Gas Collection System  

SciTech Connect

Radiochemical diagnostic techniques such as gas-phase capsule debris analysis may prove to be successful methods for establishing the success or failure of ignition experiments at the National Ignition Facility (NIF). Samples in the gas phase offer the most direct method of collection by simply pumping out the large target chamber following a NIF shot. The target capsules will be prepared with dopants which will produce radioactive noble gas isotopes upon activation with neutrons. We have designed and constructed the Radchem Apparatus for Gas Sampling (RAGS) in order to collect post-shot gaseous samples for NIF capsule diagnostics. The design of RAGS incorporates multiple stages intended to purify, transfer, and count the radioactive decays from gaseous products synthesized in NIF experiments. At the moment the dopant of choice is {sup 124}Xe, which will undergo (n,{gamma}) and (n, 2n) reactions to produce {sup 125}Xe and {sup 123}Xe. The half-lives of each are on the order of multiple hours and are suitable for long-term gamma-counting. These isotopes and the rest of the gases evolved in a NIF shot will be drawn through the NIF turbo pumps, past the temporarily shuttered cryo pumps (to aid our collection efficiency), and towards the first main portion of the RAGS system: the pre-cleaner. The pre-cleaner will consist of a water removal system, a series of heated getter cartridges to remove most other impurities such as N{sub 2}, O{sub 2}, CO{sub 2}, etc., and a residual gas analyzer (RGA) to monitor vacuum quality. The noble gases will flow through the precleaner and into the second stage of the system: the cryo collector. This cryo collector consists of a main cryo head for noble gas collection which will operate for approximately five minutes post-shot. Afterwards a valve will close and isolate the pre-cleaner, while the cryo head warms to release the Xe gas to one of two locations - either a second cryo station for in-situ gamma counting, or to a small cooled gas bottle for removal and counting. Additional capabilities of the RAGS system include a noble gas calibration apparatus attached to the NIF target chamber, which will be operated hours pre-shot to determine collection efficiency through the whole RAGS system via the signal detected from the RGA. Also it is possible there will be the addition of a helium puff system to drive the Xe through the pre-cleaner and collection stations. It is also likely that multiple cryo collection stations will be built into the system in the future to fractionate and collect other noble gases such as Kr, Ar, and possibly Ne. A prototype pre-cleaner has been built at Lawrence Berkeley National Laboratory (LBNL) and is in the testing phases. The information learned in this testing will help collaborators at Sandia National Laboratory that are building and delivering the systems that will be deployed at NIF. The LBNL testing so far has demonstrated that radioactive fission gases can be flowed through the system with and without carrier gases of air and/or He, and the activity can be collected on an activated charcoal sample. Further testing in the upcoming months will hopefully yield more information about any presence of Xe in the water removed from the system, and commissioning of a small cryo cooler as well.

Nelson, S L; Shaughnessy, D A; Schneider, D H; Stoeffl, W; Moody, K J; Cerjan, C; Stoyer, M A; Bernstein, L A; Bleuel, D L; Hoffman, R

2010-05-21T23:59:59.000Z

319

Electron capture from H-2 to highly charged Th and Xe ions trapped at center-of-mass energies near 6 eV  

E-Print Network (OSTI)

Ions with charge states as high as 80+, produced in the Lawrence Livermore National Laboratory electron beam ion trap were extracted and transferred to a Penning ion trap (RETRAP). RETRAP was operated at cryogenic temperature in the field of a...

Weinberg, G.; Beck, B. R.; Steiger, J.; Church, David A.; McDonald, J.; Schneider, D.

1998-01-01T23:59:59.000Z

320

Dependence of cross sections for multi-electron loss by 6 mev/amu xe18+ ions on target atomic number  

E-Print Network (OSTI)

ions in the present energy and charge regime. A semiempirical calculation based the IEA shows that the average most probable impact parameter for electron loss is much smaller than the target molecular bond length. This result is believed to account...

Peng, Yong

2004-09-30T23:59:59.000Z

Note: This page contains sample records for the topic "uus kr xe" 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

Electron capture from H{sub 2} to highly charged Th and Xe ions trapped at center-of-mass energies near 6 eV  

SciTech Connect

Ions with charge states as high as 80+, produced in the Lawrence Livermore National Laboratory electron beam ion trap were extracted and transferred to a Penning ion trap (RETRAP). RETRAP was operated at cryogenic temperature in the field of a superconducting magnet. The stored low-energy ions collided occasionally with H{sub 2} molecules in the ultrahigh-vacuum environment of the trap, capturing one or two electrons and reducing the charge state of the ions. The number of ions was monitored nondestructively by ramping the axial oscillation frequencies of the ions through resonance with a tuned circuit composed in part of trap capacitance and an external inductor. This produced resonance signals whose square is proportional to the number of ions in each charge state. These signals were recorded vs storage time to determine the electron-capture rates. From these rates the relative electron-capture cross sections were obtained using estimates of the mean ion energies based on modeling the ion storage, and with the aid of a density calibration measurement using Ar{sup 11+}. The measured total electron-capture cross sections are consistent with a linear increase with charge state q. The cross-section data for the highest charge states lie above the predictions of the absorbing sphere model, but agree within uncertainties in both experiment and theory. The true double-capture cross-section fraction for q{gt}35 is near 25{percent}. The results are discussed with relation to measurements on lower charge states, and with theory. {copyright} {ital 1998} {ital The American Physical Society}

Weinberg, G.; Church, D.A. [Physics Department, Texas AM University, College Station, Texas 77843-4242 (United States)] [Physics Department, Texas AM University, College Station, Texas 77843-4242 (United States); Steiger, J.; McDonald, J.; Schneider, D. [Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94550 (United States)] [Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94550 (United States)

1998-06-01T23:59:59.000Z

322

Environmental application of stable xenon and radioxenon monitoring  

E-Print Network (OSTI)

1969) Atlantic Richfield Hanford Company, Richland WA. [8]Batches Processed through Hanford Separations Plants, 1944Locations Ref iso = Xe Ave. Hanford Fuel Xe) 216-Z-1A Pu

2008-01-01T23:59:59.000Z

323

Near-Intrinsic Energy Resolution for 30 to 662 keV Gamma Rays in a High Pressure Xenon Electroluminescent TPC  

E-Print Network (OSTI)

The search for neutrinoless double beta decay, Riv. NuovoSearch for Neutrinoless Double-Beta Decay in Xe Xe with EXO-

Català, J.M.

2014-01-01T23:59:59.000Z

324

A method to measure Kr/N2 ratios in air bubbles trapped in ice cores and its application in reconstructing past mean ocean temperature  

E-Print Network (OSTI)

in krypton inventory in the glacial ocean due to higher gas solubility in colder water causes a decrease reflect past ocean temperature change due to the dependence of gas solubility on temperature. The increase of LGM deep ocean temperature based on foraminiferal d18 O and sediment pore water d18 O and chlorinity

Severinghaus, Jeffrey P.

325

High-resolution x-ray-emission study of 1s4p and 1s3d two-electron photoexcitations in Kr  

Science Journals Connector (OSTI)

High-energy-resolution photoexcited KN2,3 x-ray-emission measurements were carried out on krypton with the excitation energy tuned around the 1s4p and 1s3d double-excitation thresholds. Comprehensive two-dimensional resonant inelastic x-ray-scattering maps were recorded for the range of excitation and emission energies corresponding to both types of double excitations. The double-excitation signal could be clearly resolved from the dominant 1s ionization signal. The latter was subtracted from the measured maps, yielding isolated 1s4p and 1s3d photoexcitation spectra. Both two-electron excitation spectra are well described by a model spectrum built of consecutive bound-bound discrete transitions and shake-up and shake-off channels giving precise energies and intensities of the corresponding contributions. The obtained results are compared with other existing experimental values based on x-ray-absorption measurements and theoretical predictions.

M. Kav?i?; M. Žitnik; D. Sokaras; T.-C. Weng; R. Alonso-Mori; D. Nordlund; J.-Cl. Dousse; J. Hoszowska

2014-08-21T23:59:59.000Z

326

Calculations of Electric Dipole Transition Probabilities in the Electronic Ground States of the NeH+, ArH+, and KrH+ Ions  

Science Journals Connector (OSTI)

In systematic studies on the first- and second-row hydrides AH [1,2], AH+ [3], and AH- [4] we have shown previously that ab initio quantum-chemical calculations using highly correlated electronic wavefunctions ar...

P. Rosmus; E. A. Reinsch; H. J. Werner

1983-01-01T23:59:59.000Z

327

Microsoft Word - 2011_1205_Engstrom_RAP_100-K-comments.docx  

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

December 7, 2011 Page 1 of 4 By Dale Engstrom, HAB Issue Manager and RAP Vice-chair The Remedial InvestigationFeasibility Study for the 100-KR-1, 100-KR-2 and 100-KR-4 Operable...

328

A Note on Non-Commutative Noetherian Rings  

Science Journals Connector (OSTI)

......xeR implies xel}, 'xcel, xeR implies xel}, and xcel with ce#(0), xeU. Then xelQnR = I...l with ie/, xeR and ce^(0). Then xcel, which implies that xel. THEOREM 5......

A. T. Ludgate

1972-10-01T23:59:59.000Z

329

BNL NASA Space Radiation Laboratory  

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

Ion Species and Energies Used Previously at NSRL Ion Species and Energies Used Previously at NSRL Ion Species [1] Energy [2] (MeV/nucleon) Maximum Intensity [3] (ions per spill) LET [4] (keV/m) H-1 50 - 2500 6.4 x 1011 1.26 - 0.21 He-4 50 - 1000 0.88 x 1010 5.01 - 0.89 C-12 65 - 1000 1.2 x 1010 36.79 - 8.01 O-16 50 - 1000 0.4 x 1010 80.50 - 14.24 Ne-20 70 - 1000 0.10 x 1010 96.42 - 22.25 Si-28 93 - 1000 0.3 x 1010 151 - 44 Cl-35 500 - 1000 0.2 x 1010 80 - 64 Ar-40 350 0.02 x 1010 105.8 Ti-48 150 - 1000 0.08 x 1010 265 - 108 Fe-56 50 - 1000 0.2 x 1010 832 - 150 Kr-84 383 403 Xe-131 228 1204 Ta-181 292 - 313 1827 - 1896 Au-197 76 - 165 1 x 107 4828 - 3066 Sequential Field (Fe/H) 1000 Various 150/0.2 Solar Particle Event [5] 30 - 180 Various 1.26 - 0.21 [1] Different isotopes of some ions are also available. With the

330

It's Elemental - The Periodic Table of Elements - Elements Listed by Atomic  

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

Atomic Number Atomic Number 1 Hydrogen H 2 Helium He 3 Lithium Li 4 Beryllium Be 5 Boron B 6 Carbon C 7 Nitrogen N 8 Oxygen O 9 Fluorine F 10 Neon Ne 11 Sodium Na 12 Magnesium Mg 13 Aluminum Al 14 Silicon Si 15 Phosphorus P 16 Sulfur S 17 Chlorine Cl 18 Argon Ar 19 Potassium K 20 Calcium Ca 21 Scandium Sc 22 Titanium Ti 23 Vanadium V 24 Chromium Cr 25 Manganese Mn 26 Iron Fe 27 Cobalt Co 28 Nickel Ni 29 Copper Cu 30 Zinc Zn 31 Gallium Ga 32 Germanium Ge 33 Arsenic As 34 Selenium Se 35 Bromine Br 36 Krypton Kr 37 Rubidium Rb 38 Strontium Sr 39 Yttrium Y 40 Zirconium Zr 41 Niobium Nb 42 Molybdenum Mo 43 Technetium Tc 44 Ruthenium Ru 45 Rhodium Rh 46 Palladium Pd 47 Silver Ag 48 Cadmium Cd 49 Indium In 50 Tin Sn 51 Antimony Sb 52 Tellurium Te 53 Iodine I 54 Xenon Xe 55 Cesium Cs 56 Barium Ba 57 Lanthanum La 58 Cerium Ce

331

AtomicNuclear Properties  

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

HTML_PAGES HTML_PAGES This AtomicNuclearProperties page is under intermittent development. Suggestions and comments are welcome. Please report errors. Chemical elements: For entries in red, a pull-down menu permits selection of the physical state. Cryogenic liquid densties are at the boiling point at 1 atm. 0n 1Ps 1H 2He 3Li 4Be 5B 6C 7N 8O 9F 10Ne 11Na 12Mg 13Al 14Si 15P 16S 17Cl 18Ar 19K 20Ca 21Sc 22Ti 23V 24Cr 25Mn 26Fe 27Co 28Ni 29Cu 30Zn 31Ga 32Ge 33As 34Se 35Br 36Kr 37Rb 38Sr 39Y 40Zr 41Nb 42Mo 43Tc 44Ru 45Rh 46Pd 47Ag 48Cd 49In 50Sn 51Sb 52Te 53I 54Xe 55Cs 56Ba 57La 72Hf 73Ta 74W 75Re 76Os 77Ir 78Pt 79Au 80Hg 81Tl 82Pb 83Bi 84Po 85At 86Rn 87Fr 88Ra 89Ac 104Rf 105Db 106Sg 107Bh 108Hs 109Mt 110Ds 111Rg 112 113 114 115 116 mt 118

332

Advancement of isotope separation for the production of reference standards  

SciTech Connect

Idaho National Laboratory (INL) operates a mass separator that is currently producing high purity isotopes for use as internal standards for high precision isotope dilution mass spectrometry (IDMS). In 2008, INL began the revival of the vintage 1970’s era instrument. Advancements thus far include the successful upgrading and development of system components such as the vacuum system, power supplies, ion-producing components, and beam detection equipment. Progress has been made in the separation and collection of isotopic species including those of Ar, Kr, Xe, Sr, and Ba. Particular focuses on ion source improvements and developments have proven successful with demonstrated output beam currents of over 10 micro-amps 138Ba and 350nA 134Ba from a natural abundance source charge (approximately 2.4 percent 134Ba). In order to increase production and collection of relatively high quantities (mg levels) of pure isotopes, several advancements have been made in ion source designs, source material introduction, and beam detection and collection. These advancements and future developments will be presented.

Jared Horkley; Christopher McGrath; Andrew Edwards; Gaven Knighton; Kevin Carney; Jacob Davies; James Sommers; Jeffrey Giglio

2012-03-01T23:59:59.000Z

333

Collisional interference in the foreign-gas-perturbed far-infrared rotational spectrum of HD  

Science Journals Connector (OSTI)

The rotational transitions R(1), R(2), and R(3) of HD have been studied in absorption with 0.06-cm-1 resolution in mixtures of HD with He, Ne, Ar, Kr, Xe, H2, and N2 at 295 K and at densities between 3 and 62 amagat. Collisional interference was observed and the interference parameter, proportional to the ratio of the average induced moment to the allowed moment, showed a dependence on system size and ranged from +10×10-3 amagat-1 for light perturbers to -24×10-3 amagat-1 for the heavier ones. These interference effects in the pure rotational band are an order of magnitude smaller than those of the fundamental vibrational band and show a strong J dependence not predicted within current theory. The sign of the isotropic overlap component of the induced moment was determined experimentally in an unambiguous way and its trend was found to be within theoretical expectation; specifically, the sign changes as the mass increases. The line shapes were mostly symmetrical and Lorentzian; asymmetry was observed mainly for the R(1) transition with the low-frequency side of the lines super-Lorentzian and the high-frequency side sub-Lorentzian. Investigation of the effect of collision duration on the autocorrelation function of the allowed moment showed it was not important to the integrated allowed absorption.

P. G. Drakopoulos and G. C. Tabisz

1987-12-15T23:59:59.000Z

334

Resonances in the Photo-Ionization Continuum of Ne I (20-150 eV)  

Science Journals Connector (OSTI)

The absorption spectrum of neon in the region 20-150 eV has been studied photographically and photoelectrically, using synchrotron light as a background source. Discrete structure has been observed in three distinct energy ranges. The first is between the P?12, 322 limits near 22 eV, involving resonances analogous to those observed by Beutler in Ar, Kr, and Xe; the second is the region between 44 and 60 eV, the structure here being classified as due to two types of excitation: (i) the excitation of a subshell 2s electron, (ii) the simultaneous excitation of two outer 2p electrons; the third region is near 80 eV, where two weak resonances are observed, due to the simultaneous excitation of a subshell 2s and a 2p electron. The resonance profiles of the states 2s 2p6 np P?11, where n=3,4, and 5, and the two-electron excitation state 2p4 (P3) 3s 3p P?11 have been studied quantitatively and values of q, ?, and ? determined for each.

K. Codling; R. P. Madden; D. L. Ederer

1967-03-05T23:59:59.000Z

335

Modeling of clusters in a strong 248-nm laser field by a three-dimensional relativistic molecular dynamic model  

SciTech Connect

A relativistic time-dependent three-dimensional particle simulation model has been developed to study the interaction of intense ultrashort KrF (248 nm) laser pulses with small Xe clusters. The trajectories of the electrons and ions are treated classically according to the relativistic equation of motion. The model has been applied to a different regime of ultrahigh intensities extending to 10{sup 21} W/cm{sup 2}. In particular, the behavior of the interaction with the clusters from intensities of {approx}10{sup 15} W/cm{sup 2} to intensities sufficient for a transition to the so-called 'collective oscillation model' has been explored. At peak intensities below 10{sup 20} W/cm{sup 2}, all electrons are removed from the cluster and form a plasma. It is found that the 'collective oscillation model' commences at intensities in excess of 10{sup 20} W/cm{sup 2}, the range that can be reached in stable relativistic channels. At these high intensities, the magnetic field has a profound effect on the shape and trajectory of the electron cloud. Specifically, the electrons are accelerated to relativistic velocities with energies exceeding 1 MeV in the direction of laser propagation and the magnetic field distorts the shape of the electron cloud to give the form of a pancake.

Petrov, G.M.; Davis, J.; Velikovich, A.L.; Kepple, P.C.; Dasgupta, A.; Clark, R.W. [Plasma Physics Division, Naval Research Laboratory, 4555 Overlook Ave SW, Washington, DC 20375 (United States); Borisov, A.B.; Boyer, K.; Rhodes, C.K. [Laboratory for X-Ray Microimaging and Bioinformatics, Department of Physics, University of Illinois at Chicago, Chicago, Illinois 60607-7059 (United States)

2005-03-01T23:59:59.000Z

336

Selection of Isotopes and Elements for Fuel Cycle Analysis  

SciTech Connect

Fuel cycle system analysis simulations examine how the selection among fuel cycle options for reactors, fuel, separation, and waste management impact uranium ore utilization, waste masses and volumes, radiotoxicity, heat to geologic repositories, isotope-dependent proliferation resistance measures, and so forth. Previously, such simulations have tended to track only a few actinide and fission product isotopes, those that have been identified as important to a few criteria from the standpoint of recycled material or waste, taken as a whole. After accounting for such isotopes, the residual mass is often characterized as “fission product other” or “actinide other”. However, detailed assessment of separation and waste management options now require identification of key isotopes and residual mass for Group 1A/2A elements (Rb, Cs, Sr, Ba), inert gases (Kr, Xe), halogens (Br, I), lanthanides, transition metals, transuranic (TRU), uranium, actinide decay products. The paper explains the rationale for a list of 81 isotopes and chemical elements to better support separation and waste management assessment in dynamic system analysis models such as Verifiable Fuel Cycle Simulation (VISION)

Steven J. Piet

2009-04-01T23:59:59.000Z

337

Migration and retention of elements at the Oklo natural reactor  

SciTech Connect

The Oklo natural reactor, Gabon, permits study of fission-produced elemental behavior in a natural geologic environment. The uranium ore that sustained fission reactions formed about 2 billion years before present (BYBP), and the reactor was operative for about 5 x 10/sup 5/ yrs between about 1.95 to 2 BYBP. The many tons of fission products can, for the most part, be studied for their abundance and distribution today. Since reactor shutdown, many fissiogenic elements have not migrated from host pitchblende, and several others have migrated only a few tens of meters from the reactor ore. Only Xe and Kr have apparently been largely removed from the reactor zones. An element by element assessment of the Oklo rocks' ability to retain the fission products, and actinides and radiogenic Pb and Bi as well, leads to the conclusion that no widespread migration of the elements occurred. This suggests that rocks with more favorable geologic characteristics are indeed well suited for consideration for the storage of radioactive waste.

Brookins, D.G.

1982-01-01T23:59:59.000Z

338

Mobility of Supercooled liquid Toluene, Ethylbenzene, and Benzene near their Glass Transition Temperatures Investigated using Inert Gas Permeation  

SciTech Connect

We investigate the mobility of supercooled liquid toluene, ethylbenzene, and benzene near their respective glass transition temperatures (Tg). The permeation rate of Ar, Kr, and Xe through the supercooled liquid created when initially amorphous overlayers heated above their glass transition temperature is used to determine the diffusivity. Amorphous benzene crystallizes at temperatures well below its Tg and as a result the inert gas underlayer remains trapped until the onset of benzene desorption. In contrast, for toluene and ethylbenzene the onset of inert gas permeation is observed at temperatues near Tg. The inert gas desorption peak temperature as a function of the heating rate and overlayer thickness is used to quantify the diffusivity of supercooled liquid toluene and ethylbenzene from 115 K to 135 K. In this temperature range, diffusivities are found to vary across five orders of magnitude (~10-14 to 10-9 cm2/s). These data are compared to viscosity measurements and used to determine the low temperature fractional Stokes-Einstein exponent. Efforts to determine the diffusivity of a mixture of benzene and ethylbenzene are detailed, and the effect of mixing these materials on benzene crystallization is explored using infrared spectroscopy.

May, Robert A.; Smith, R. Scott; Kay, Bruce D.

2013-11-21T23:59:59.000Z

339

APPLIED AND ENVIRONMENTAL MICROBIOLOGY, JUlY 1991, p. 2079-2084 Vol. 57, No. 7 0099-2240/91/072079-06$02.00/0  

E-Print Network (OSTI)

APPLIED AND ENVIRONMENTAL MICROBIOLOGY, JUlY 1991, p. 2079-2084 Vol. 57, No. 7 0099Uus subtilis, and Pseudomonas aeruginosa), fungus (Trichophyton mentagrophytes), and viruses (feline is by the application of acoustic energy, which is investigated here. Considerable insight has been gained through

Illinois at Urbana-Champaign, University of

340

Observable fast kinetic eigenmode in binary noble-gas mixtures  

SciTech Connect

It is suggested that a fast kinetic mode should be observable in a whole class of disparate mass fluid mixtures, such as gaseous He-Xe, by neutron scattering experiments, at not too high densities and Xe concentrations.

Campa, A.; Cohen, E.G.D.

1988-08-15T23:59:59.000Z

Note: This page contains sample records for the topic "uus kr xe" 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.


341

SciTech Connect: Search for Neutrinoless Double-Beta Decay in...  

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

Search for Neutrinoless Double-Beta Decay in 136Xe with EXO-200 Citation Details In-Document Search Title: Search for Neutrinoless Double-Beta Decay in 136Xe with EXO-200...

342

Spectroscopy of AlAr and AlKr from 31 000 cm-1 to the ionization limit Scott A. Heidecke,@ Zhenwen Fu,b, John FL Colt,") and Michael D. Morse  

E-Print Network (OSTI)

speciessuch as glyoxal-Ar (Ref. 10) and s-tetrazine-acety- lene." In most cases, however, only one (or a few

Morse, Michael D.

343

March 4, 2013 R&D towards large-liquid scintillator detectors and measurement of  

E-Print Network (OSTI)

of experiments to search for the neutrinoless double beta decay of 136 Xe. The first such experiment, known

McDonald, Kirk

344

High-Pressure Phase Behavior and Cage Occupancy for the CF4 Hydrate System  

Science Journals Connector (OSTI)

stability of Xe and CF4 clathrate hydrates was studied by evaluating various components of the free energy of formation. ... Introduction of CF4 gives rise to a significant distortion of the structure; whereas, Xe does not change the structure from the empty lattice. ... stability of Xe and CF4 hydrates. ...

Keisuke Sugahara; Masayoshi Yoshida; Takeshi Sugahara; Kazunari Ohgaki

2004-01-16T23:59:59.000Z

345

Natural fission reactors in the Franceville basin, Gabon: A review of the conditions and results of a {open_quotes}critical event{close_quotes} in a geologic system  

SciTech Connect

Natural nuclear fission reactors are only known in two uranium deposits in the world, the Oklo and Bangombe deposits of the Franceville basin: Gabon. Since 1982, five new reactor zones have been discovered in these deposits and studied since 1989 in a cooperative European program. New geological, mineralogical, and geochemical studies have been carried out in order to understand the behavior of the actinides and fission products which have been stored in a geological environment for more than 2.0 Ga years. The Franceville basin and the uranium deposits remained geologically stable over a long period of time. Therefore, the sites of Oklo and Bangombe are well preserved. For the reactors, two main periods of actinide and radionuclides migration have been observed: during the criticality, under P-T conditions of 300 bars and 400-500{degrees}C, respectively, and during a distention event which affected the Franceville basin 800 to 900 Ma ago and which was responsible for the intrusion of dolerite dikes close to the reactors. New isotopic analyses on uranium dioxides, clays, and phosphates allow us to determine their respective importance for the retention of fission products. The UO{sub 2} matrix appears to be efficient at retaining most actinides and fission products such as REEs, Y, and Zr but not the volatile fission products (Cd, Cs, Xe, and Kr) nor Rb, Sr, and Ba. Some fissiogenic elements such as Mo, Tc, Ru, Rh, Pd, and Te could have formed metallic and oxide inclusion in the UO{sub 2} matrix which are similar to those observed in artificial spent fuel. Clays and phosphate minerals also appear to have played a role in the retention of fissiogenic REEs and also of Pu. 82 refs., 21 figs., 12 tabs.

Gauthier-Lafaye, F. [CNRS, Strasbourg (France)] [CNRS, Strasbourg (France); Holliger, P. [CEA-Cadarache, Saint-Paul-les-Durance (France)] [CEA-Cadarache, Saint-Paul-les-Durance (France); Blanc, P.L. [Institut de Protection et de Surete Nucleaire, Fontenay-aux-Roses (France)] [Institut de Protection et de Surete Nucleaire, Fontenay-aux-Roses (France)

1996-12-01T23:59:59.000Z

346

A multiple-tracer approach to understanding regional groundwater flow in the Snake Valley area of the eastern Great Basin, USA  

Science Journals Connector (OSTI)

Abstract Groundwater in Snake Valley and surrounding basins in the eastern Great Basin province of the western United States is being targeted for large-scale groundwater extraction and export. Concern about declining groundwater levels and spring flows in western Utah as a result of the proposed groundwater withdrawals has led to efforts that have improved the understanding of this regional groundwater flow system. In this study, environmental tracers (?2H, ?18O, 3H, 14C, 3He, 4He, 20Ne, 40Ar, 84Kr, and 129Xe) and major ions from 142 sites were evaluated to investigate groundwater recharge and flow-path characteristics. With few exceptions, ?2H and ?18O show that most valley groundwater has similar ratios to mountain springs, indicating recharge is dominated by relatively high-altitude precipitation. The spatial distribution of 3H, terrigenic helium (4Heterr), and 3H/3He ages shows that modern groundwater (temperatures (NGTs) are generally 1–11 °C in Snake and southern Spring Valleys and >11 °C to the east of Snake Valley and indicate a hydraulic discontinuity between Snake and Tule Valleys across the northern Confusion Range. The combination of \\{NGTs\\} and 4Heterr shows that the majority of Snake Valley groundwater discharges as springs, evapotranspiration, and well withdrawals within Snake Valley rather than continuing northeastward to discharge at either Fish Springs or the Great Salt Lake Playa. The refined understanding of groundwater recharge and flow paths acquired from this multi-tracer investigation has broad implications for interbasin subsurface flow estimates and future groundwater development.

Philip M. Gardner; Victor M. Heilweil

2014-01-01T23:59:59.000Z

347

Evolution of the geothermal fluids at Los Azufres, Mexico, as traced by noble gas isotopes, ?18O, ?D, ?13C and 87Sr/86Sr  

Science Journals Connector (OSTI)

Isotopes of noble gases, CO2, H2O and Sr were measured in 10 geothermal wells and 8 hot springs, fumaroles and mud volcanoes at Los Azufres, the second most important geothermal field in Mexico. The aim of this study is to provide additional information on fluid circulation in the field and surrounding areas (Araró hot springs), as well as on physical processes such as boiling, steam separation and invasion of re-injected brines following over 25 years of geothermal fluid exploitation. Mantle helium dominates in fluids from the northern production zone of Marítaro, with measured 3He/4He ratios up to 7 Ra (where Ra is the atmospheric ratio of 1.386 × 10? 6). 3He/4He ratios are positively correlated with 87Sr/86Sr ratios and with ?D and ?18O. These relationships suggest that Los Azufres fluids represent a mixing between primary magmatic 3He-rich fluids and groundwater currently discharging at Araró hot springs and enriched in radiogenic 4He acquired from Miocene andesites. Unusually high He ratios together with radiogenic Sr isotopic ratios suggest that thermal waters acquired mantle He from deep-seated parent magmas and radiogenic Sr possibly during their uprising through the metamorphic basement. 40Ar/36Ar ratios of 366 to 429 measured in two wells indicate either mantle-derived argon or a radiogenic 40Ar in situ component, suggesting the local presence of an older crustal fluid component in the northern part of the field. Ne, Kr and Xe are entirely of atmospheric origin, but processes of boiling, steam separation and re-injection of used brines have led to fractionation of their elemental abundances. Comparison with previous studies suggests that the boiling zone in the northern production zone is currently extending further north (Marítaro hot springs). In the southwestern productive zone, re-injected brines might account for more than 90% of the exploited fluids.

D.L. Pinti; M.C. Castro; O. Shouakar-Stash; A. Tremblay; V.H. Garduño; C.M. Hall; J.-F. Hélie; B. Ghaleb

2013-01-01T23:59:59.000Z

348

nike | National Nuclear Security Administration  

National Nuclear Security Administration (NNSA)

goddess of victory, the Nike facility includes the world's largest krypton fluoride (KrF) laser. Nike was developed primarily to investigate interactions of high intensity KrF...

349

Sediment transport time measured with U-Series isotopes: Results from ODP North Atlantic Drill Site 984  

E-Print Network (OSTI)

1043. V. Baker, B.N. Bjornstad, A.J. Busacca, K.R. Fecht,1991, 215-250 pp. B.N. Bjornstad, K.R. Fecht, C.J. Pluhar,

DePaolo, Donald J.; Maher, Kate; Christensen, John N.; McManus, Jerry

2006-01-01T23:59:59.000Z

350

Diversity and Change in Cambodian Households (1998-2006)  

E-Print Network (OSTI)

patterns depend on having lost parents during the KR and on9.8% for individuals who lost their parent(s) in a differentamong individuals who lost a parent during the KR, it was

Demont, Floraine; Heuveline, Patrick

2008-01-01T23:59:59.000Z

351

E-Print Network 3.0 - acm international conference Sample Search...  

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

ON COMPUTERAIDED DESIGN ICCV IEEE INTERNATIONAL CONFERENCE... OF KR & REASONING MICRO IEEEACM MICRO MOBILEHCI INTERNATIONAL CONFERENCE ON HUMANCOMPUTER INTERACTION......

352

Development of Distributed Programming Developing Tool-Kit Based on Object Group Model  

E-Print Network (OSTI)

, Korea {jtlim, scjoo}@wonkwang.ac.kr Chang-Sun Shin School of Information and Communication Engineering

Joo, Su-Chong

353

7, 1398914010, 2007 TTL climatology  

E-Print Network (OSTI)

ACPD 7, 13989­14010, 2007 TTL climatology K. Kr¨uger et al. Title Page Abstract Introduction Discussions Long-term climatology of air mass transport through the Tropical Tropopause Layer (TTL) during NH: K. Kr¨uger (kkrueger@ifm-geomar.de) 13989 #12;ACPD 7, 13989­14010, 2007 TTL climatology K. Kr

Paris-Sud XI, Université de

354

GENERATION OF RADIOXENON ISOTOPES  

SciTech Connect

With the continued population of the International Monitoring System (IMS) network and the certification of radioxenon laboratory systems it has become necessary to calibrate and test these systems using as many of the radioxenon isotopes as possible. Several very promising techniques have been explored recently that allow for convenient production of Xe-133, Xe-131m, the short-lived isotope Xe-135, and even the difficult to obtain Xe-133m. IMS national and international laboratories have traditionally obtained Xe-133 from medical isotope suppliers. The activity of these medical dose samples is extremely high (~ 740 MBq) and requires very careful fume hood work to dilute down to appropriate levels (~ 10 Bq). By waiting for 10 or more half-lives it is possible to reduce the handling regimen considerably, while also obtaining a strong Xe-131m signature due to its longer half-life (11.9 days). The short-lived isotope Xe-135 (9.14 hrs) and the longer lived parent nuclide Xe-133m (2.2 day half-life) are never present in these samples. To obtain these isotopes another source or technique is required. This paper will discuss the two techniques developed and implemented at Pacific Northwest National Lab (PNNL) and show the results obtained from each technique. The first is an in-house method that allows for on demand production of two of these isotopes, Xe-133 and Xe-135, using HEU and a modest flux neutron source. The second method uses a research reactor at the Pullman campus of Washington State University to produce Xe-133, Xe-133m and Xe-135.

McIntyre, Justin I.; Pratt, Sharon L.; Bowyer, Ted W.; Cooper, Matthew W.; Hayes, James C.; Heimbigner, Tom R.; Hubbard, Charles W.; Miley, Harry S.; Ripplinger, Mike D.

2008-09-23T23:59:59.000Z

355

Higher dimensions Max flow min cut in higher dimensions  

E-Print Network (OSTI)

, and direction) to each edge such that: net flow at each vertex, except S and T, is zero; and |xe| e. Value-negative number, and direction) to each edge such that: net flow at each vertex, except S and T, is zero; and |xe of flow xe (non-negative number, and direction) to each edge such that: net flow at each vertex is zero

Duval, Art

356

Higher dimensions Max flow min cut in higher dimensions  

E-Print Network (OSTI)

-negative number, and direction) to each edge such that: net flow at each vertex, except S and T, is zero; and |xe, and direction) to each edge such that: net flow at each vertex is zero; and |xe| e. Value of flow is x0. Duval: net flow at each vertex is zero; and |xe| e. Value of flow is x0. Definition Cut is minimal set

Duval, Art

357

Aerial measurement of radioxenon concentration off the west coast of Vancouver Island following the Fukushima reactor accident  

Science Journals Connector (OSTI)

In response to the Fukushima nuclear reactor accident, on March 20th, 2011, Natural Resources Canada conducted aerial radiation surveys over water just off the west coast of Vancouver Island. Dose–rate levels were found to be consistent with background radiation, however a clear signal due to 133Xe was observed. Methods to extract 133Xe count rates from the measured spectra, and to determine the corresponding 133Xe activity concentration, were developed. The measurements indicate that 133Xe concentrations on average lie in the range of 30–70 Bq/m3.

L.E. Sinclair; H.C.J. Seywerd; R. Fortin; J.M. Carson; P.R.B. Saull; M.J. Coyle; R.A. Van Brabant; J.L. Buckle; S.M. Desjardins; R.M. Hall

2011-01-01T23:59:59.000Z

358

Quantum mechanical calculations on the potential energy surface for the formation of xenon dichloride and the nature of the (n5-cyclopentadienyl) dicarbonyliron-arene bond  

E-Print Network (OSTI)

energy surface for the reaction Xe + Clz XeClz, and approximate molecular orbital calculations are used to explore the nature of the iron-arene bond in 1, 4-C6H4Fpz where Fp = (q5-C5H5)Fe(CO)z. Previous extended Hiickel calculations on the reaction Xe... molecule shows the reliability of our final method, multi-reference (seven) configuration-interaction calculation with the Davidson size- consistency correction. This method is then used to calculate the potential energy surface of XeC12 from which we...

Richardson, Nancy Arline

2012-06-07T23:59:59.000Z

359

Search for Majorana neutrinos with the first two years of EXO-200 data  

Science Journals Connector (OSTI)

... 062502 (2013) Auger, M. et al. (EXO-200 Collaboration). Search for neutrinoless double-beta decay in 136Xe with EXO-200. Phys. Rev. Lett. 109, 032505 (2012) ...

2014-06-04T23:59:59.000Z

360

Environmental application of stable xenon and radioxenonmonitoring  

SciTech Connect

Characterization of transuranic waste is needed to makedecisions about waste site remediation. Soil-gas sampling for xenonisotopes can be used to define the locations of spent fuel andtransuranic wastes. Radioxenon in the subsurface is characteristic oftransuranic waste and can be measured with extreme sensitivity usinglarge-volume soilgas samples. Measurements at the Hanford Site showed133Xe and 135Xe levels indicative of 240Pu spontaneous fission. Stablexenon isotopic ratios from fission are distinct from atmospheric xenonbackground. Neutron capture by 135Xe produces an excess of 136Xe inreactor-produced xenon providing a means of distinguishing spent fuelfrom separated transuranic materials.

Dresel, P. Evan; Olsen, Khris B.; Hayes, James C.; McIntyre,Justin I.; Waichler, Scott R.; Milbrath, Brian D.; Cooper, Matt; Kennedy,B. Mack

2006-09-05T23:59:59.000Z

Note: This page contains sample records for the topic "uus kr xe" 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

LES KARATES UNE COMMUNAUTE CAIROTE A L'HEURE DE L'TAT-NATION  

E-Print Network (OSTI)

ensuite en Palestine au Xe siècle, et arriva en Egypte. Un certain nombre de familles persanes, dont les

Paris-Sud XI, Université de

362

Designing AC Power Grids using Integer Linear Programming  

E-Print Network (OSTI)

A power grid is a transmission network transporting electrical energy from power ... cost factor for the active power losses, Re the line resistance, and Xe the ...

2011-02-18T23:59:59.000Z

363

Cooperative optimal path planning for herding problems  

E-Print Network (OSTI)

can include lower and upper limits on the control. The controls (speed of the 7 pursuer) are restricted in the following manner: Controls : 8 >>>: _xp 2 [?1;1] _yp 2 [?1;1] (2.4) We determine difierential equations for the states by manipulating... only take the minus sign for _xe and _ye. So state equations are: State Equations : 8 >>>: _xe = ?1r cos( ) _ye = ?1r sin( ) (2.9) where: r = q (xp ?xe)2 +(yp ?ye)2 = tan?1 ?y p ?ye xp ?xe ! 8 For a representative computation, the initial conditions...

Lu, Zhenyu

2009-05-15T23:59:59.000Z

364

September 14. 2010 Romualdo de Souza  

E-Print Network (OSTI)

functions and collective motion in Xe+Au collisions at E/A=50 MeV, G. Verde, P. Danielewicz, W.G. Lynch, C

de Souza, Romualdo T.

365

A Search for the Neutrinoless Double Beta Decay of Xenon-136 with Improved Sensitivity from Denoising .  

E-Print Network (OSTI)

??The EXO-200 detector is designed to search for the neutrinoless double beta decay of 136Xe. ??0? decay, if it occurs in nature, would demonstrate the… (more)

Davis, Clayton G.

2014-01-01T23:59:59.000Z

366

A Search for Neutrinoless Double-Beta Decay with EXO-200 .  

E-Print Network (OSTI)

??This work presents a search for neutrinoless double beta decay of 136Xe using data from the EXO-200 detector collected between 2011 and 2012. Neutrinoless double… (more)

Slutsky, Simon

2013-01-01T23:59:59.000Z

367

Gaseous fission product management for molten salt reactors and vented fuel systems  

SciTech Connect

Fission gas disposal is one of the unresolved difficulties for Molten Salt Reactors (MSRs) and advanced reactors with vented fuel systems. As these systems operate, they produce many radioactive isotopes of xenon and krypton (e.g. {sup 135}Xe t{sub 1/2} = 9.14 hours and {sup 85}Kr t{sub 1/2}= 10.73 years). Removing these gases proves vital to the success of such reactor designs for two reasons. First, the gases act as large neutron sinks which decrease reactivity and must be counterbalanced by increasing fuel loading. Second, for MSRs, inert fission product gases naturally separate quickly from high temperature salts, thus creating high vapor pressure which poses safety concerns. For advanced reactors with solid vented fuel, the gases are allowed to escape into an off-gas system and thus must be managed. Because of time delays in transport of fission product gases in vented fuel systems, some of the shorter-lived radionuclides will decay away thereby reducing the fission gas source term relative to an MSR. To calculate the fission gas source term of a typical molten salt reactor, we modeled a 1000 MWe graphite moderated thorium MSR similar to that detailed in Mathieu et al. [1]. The fuel salt used in these calculations was LiF (78 mole percent) - (HN)F 4 (22 mole percent) with a heavy nuclide composition of 3.86% {sup 233}U and 96.14% {sup 232}Th by mass. Before we can remove the fission product gases produced by this reactor configuration, we must first develop an appropriate storage mechanism. The gases could be stored in pressurized containers but then one must be concerned about bottle failure. Methods to trap noble gases in matrices are expensive and complex. Alternatively, there are direct storage/disposal options: direct injection into the Earth or injecting a grout-based product into the Earth. Advances in drilling technologies, hydro fracture technologies, and methods for the sequestration of carbon dioxide from fossil fuel plants are creating new options for disposal of fission gas wastes. In each option, lithostatic pressure, a kilometer or more underground, eliminates the pressure driving force for noble gas release and dissolves any untrapped gas in deep groundwater or into incorporated solid waste forms. The options, challenges, and potential for these methods to dispose of gaseous fission products are described. With this research, we hope to help both MSRs and other advanced reactors come one step closer to commercialization. (authors)

Messenger, S. J. [Massachusetts Inst. of Technology, 77 Massachusetts Ave., 54-1717, Cambridge, MA 02139 (United States); Forsberg, C. [Massachusetts Inst. of Technology, 77 Massachusetts Ave., 24-207, Cambridge, MA 02139 (United States); Massie, M. [Massachusetts Inst. of Technology, 77 Massachusetts Ave., NW12-230, Cambridge, MA 02139 (United States)

2012-07-01T23:59:59.000Z

368

Using 3He/4He isotope ratios to identify the source of deep reservoir contributions to shallow fluids and soil gas  

Science Journals Connector (OSTI)

One strategy to counteract rising atmospheric CO2 levels is the capture and subsequent geological storage of anthropogenic CO2. Legislation will require the monitoring and early identification of any leakage to the near surface from the storage site. Owing to their low concentrations and unreactive nature, noble gases are well established as key tracers of crustal fluid systems (Ballentine et al., 2002). The 3He/4He and noble gas content of soil gases and groundwater may provide the opportunity to detect, identify and quantify a weak, deep-sourced signal that contributes to a larger, near-surface biological signal. We present 3He/4He, Ne, Ar, Kr, and Xe data from near-surface soil gases, two of which exhibit hydrocarbon microseepage from deeper oil reservoirs from the Teapot Dome oil field, Wyoming, USA. We also present a noble gas characterisation of the oil reservoirs beneath the seepages. A helium excess (4Heexcess up to 37.7 ppm) relative to air concentrations (4Heair = 5.24 ppm) is found in soil gases at both microseepage sites. Error propagation demonstrates that it is possible to unambiguously resolve the 3He/4He of the deep helium source and allows us to explore the limits of this technique. At one seep the resolved deep 3He/4He = 0.055 ± 0.009Ra (where Ra = 1.40 × 10? 6) is indistinguishable from the range observed in the subsurface hydrocarbon system of 0.046 to 0.109Ra. Notably the soil gas 4He/CH4 = 1.8 × 10? 3 at this microseepage site compares similarly with the lower subsurface source 4He/CH4 = 1.4 to 3.4 × 10? 4 and demonstrates the conservative nature of helium as a tracer. We show that the sensitivity of helium as a deep fluid tracer should be increased by up to two orders of magnitude in groundwater compared to soil gases studied here due to the low solubility of helium in water. Groundwater rather than soil gas should be the priority in any monitoring strategy that plans to use helium as an early indicator of deep fluid microseepage.

Sarah J. Mackintosh; Chris J. Ballentine

2012-01-01T23:59:59.000Z

369

c Copyright 2010. W. Marshall Leach, Jr., Professor, Georgia Institute of Technology, School of Electrical and Computer Engineering.  

E-Print Network (OSTI)

of Electrical and Computer Engineering. The Common-Emitter Amplifier Basic Circuit Fig. 1 shows the circuit and emitter with Thévenin equivalent circuits as shown in Fig. 4. vtb = vs R1kR2 Rs + R1kR2 Rtb = RskR1kR2 vte + Rte (c) Solve for the voltage gain Av = vo/vs. A flow graph is shown in Figure 6. Figure 6: Flow

Leach Jr.,W. Marshall

370

c Copyright 2010. W. Marshall Leach, Jr., Professor, Georgia Institute of Technology, School of Electrical and Computer Engineering.  

E-Print Network (OSTI)

of Electrical and Computer Engineering. The Common-Collector Amplifier Basic Circuit Fig. 1 shows the circuit with a Thévenin equivalent circuit as shown in Fig. 4. vtb = vs R1kR2 Rs + R1kR2 Rtb = R1kR2 Exact Solution (a) Solve for the voltage gain. The flow graph is shown in Figure 6. It is given by Av = ve vs = vtb vs � ve

Leach Jr.,W. Marshall

371

Spherical waves r Legendre polynomials  

E-Print Network (OSTI)

1 Impedance · Spherical waves r er e e Impedance · Legendre polynomials P0(x) = 1 P1(x) = x P2(x · Spherical waves ­ Spherical Hankel functions hn (2)(kr)=jn(kr)-iyn(kr) Impedance · Spherical waves Order: 0 1 4 Circumferential And azimuthal: 0,0 1,1 3,2 #12;3 Impedance · Spherical waves ­ Arbitrary

Berlin,Technische Universität

372

Future perspectives in melanoma research. Meeting report from the ¿Melanoma Bridge. Napoli, December 2nd-4th 2012¿  

E-Print Network (OSTI)

Chen J, Yang Y, Yagita H, Overwijk WW, Lizée G, Radvanyi L,2012, 30:8504. abstr. 38. Overwijk WW, Tsung A, Irvine KR,

2013-01-01T23:59:59.000Z

373

Niels Monberg, en af landets frste IT-ingenir-studerende, har selv  

E-Print Network (OSTI)

først lige vise din interesse og din værdi", siger Niels Monberg. "Det kræver, at du stiller dig der

374

XL Compiler Dr. Achim Bmelburg  

E-Print Network (OSTI)

=> traditional (K&R) C-compiler xlc => ANSI 89 C c89 => alias for xlc xlC => ANSI 98 C++ c99 => ANSI 99 C #12

Fiebig, Peter

375

SITE NAME: CITY:  

Office of Legacy Management (LM)

Purchase Order ,,LT-u----l ,+-et) -r&'b' f ------------- c t CONTRACTING PERIOD: &?2 -,?&&+k&&- ?g-'4J3'-'kr7 --- OWNERSHIP: AKNED AEC...

376

E-Print Network 3.0 - attosecond electron wavepacket Sample Search...  

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

of valence electron motion Eleftherios Goulielmakis1 Summary: a Figure 4 | Attosecond absorption spectroscopy reveals intra-atomic electron wave-packet motion in Kr1 . a... ....

377

Balancing the benefits of n-3 polyunsaturated fatty acids and the risks of methylmercury exposure from fish consumption  

E-Print Network (OSTI)

, are the subject of much ongoing research.8­13 nure_415 493..508 Affiliations: KR Mahaffey (deceased) was formerly

Sunderland, Elsie M.

378

E-Print Network 3.0 - affects arabidopsis responses Sample Search...  

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

Summary: Straeten D, Verbelen J. In the early response of Arabidopsis roots to ethylene, cell elongation is up... in the Arabidopsis Root Truernit E, Siemering KR, Hodge S,...

379

Tim Schuster The ALICE Experiment  

E-Print Network (OSTI)

V Kr, Au FOPI, KAOS, HADES RHIC BNL, Brookhaven 2000-today sNN=200 GeV Cu, Au, U STAR, PHENIX, BRAHMS

380

U-138: Cisco IOS IPSec IKE Unspecified Denial of Service Vulnerability |  

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

8: Cisco IOS IPSec IKE Unspecified Denial of Service 8: Cisco IOS IPSec IKE Unspecified Denial of Service Vulnerability U-138: Cisco IOS IPSec IKE Unspecified Denial of Service Vulnerability April 2, 2012 - 7:00am Addthis PROBLEM: A vulnerability has been reported in Cisco IOS, which can be exploited by malicious people to cause a DoS (Denial of Service). PLATFORM: Cisco IOS XE 2.1.x Cisco IOS XE 2.2.x Cisco IOS XE 2.3.x Cisco IOS XE 2.4.x Cisco IOS XE 2.5.x Cisco IOS XE 2.6.x Cisco IOS XE 3.1.x Cisco IOS XE 3.3.x ABSTRACT: The IKEv1 feature of Cisco IOS Software contains a vulnerability that could allow an unauthenticated, remote attacker to cause a reload of an affected device. REFERENCE LINKS: Vendor Advisory Secunia Advisory SA48607 CVE-2012-0381 iMPACT ASSESSMENT: High discussion: The March 28, 2012, Cisco IOS Software Security Advisory bundled

Note: This page contains sample records for the topic "uus kr xe" 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.


381

Homomorphisms of Banach Algebras into Arens-Hoffman Extensions of a Semi-Simple Algebra  

Science Journals Connector (OSTI)

......B, where || -||B is the norm on B. Let v': B' -* Aoc be defined by v'(Xe' + b) = Xe + v(b). Clearly, v...in [10]. Thus, || '||" is equivalent to || -||f on Aoc, from which it is easily concluded that B is || -^-closed......

John A. Lindberg; Jr.

1976-05-01T23:59:59.000Z

382

The role of lattice excitation in Si etching  

E-Print Network (OSTI)

The chemistries of fluorine, F?, and xenon difluoride, XeF?, with clean Si are basically the same, while their chemistries diverge dramatically past I ML F coverage. With a clean Si surface, F? and XeF? react utilizing an ...

Blair, Michael Ryan

2014-01-01T23:59:59.000Z

383

Surface-plasmon exploration of multilayer physisorbed and chemisorbed films on metal substrates  

SciTech Connect

Over the course of this 3 year DOE contract we have built up a high quality Surface Plasmon Resonance apparatus, surveyed Xe, O/sub 2/ and CO multilayer adsorption of silver, made several appropriate experimental modifications and then obtained data on low pressure bulk formation of Xenon multilayers. A publication of current Xe results is now in preparation.

Bretz, M.

1984-03-31T23:59:59.000Z

384

Linked Injectives and Ore Localizations  

Science Journals Connector (OSTI)

......injective right (Z?//)-module. By (a), L is ^-divisible and hence ^-divisible. Consider xeE and c e ^ such that xceL. Then xc = yc for some yeL, whence x = y and so xeL. Thus E/L is ^-torsion-free. In view of Lemma 1.1, we investigate......

K. R. Goodearl

1988-06-01T23:59:59.000Z

385

Time-reversal invariance violation measurement using polarized neutron scattering from polarized xenon  

E-Print Network (OSTI)

We proposed to use polarized neutrons scattering from a hyperpolarized 131Xe gaseous target in order to measure time-reversal violation effect in baryon processes with nucleons. This article provides a brief introduction, historical review, and possible methods to construct a hyperpolarized 131Xe gaseous target.

Pinghan Chu

2014-03-06T23:59:59.000Z

386

Deadly diving? Physiological and behavioural management of decompression stress in diving mammals  

Science Journals Connector (OSTI)

...triggering biochemical cascades possibly initiating an...are not clear. Inert gas uptake and supersaturation...radioactive isotope of inert gas (e.g. Xe127 or Xe133...novel anthropogenic or natural threats physiological...avoidance, tolerance, bubble gas composition gas sampling...

2012-01-01T23:59:59.000Z

387

Thermodynamic Investigations of Aqueous Ternary Complexes for Am/Cm Separation  

E-Print Network (OSTI)

lawrencium. The element promethium is notable for being theRn]5f 3 6d 1 7s 2 [Rn]5f 3 Promethium [Xe]4f 5 6s 2 [Xe]4f 4Cerium Praseodymium Neodymium Promethium Samarium Europium

Leggett, Christina Joy

2012-01-01T23:59:59.000Z

388

Laser Fusion Research at NRL Fusion Power Associates Meeting  

E-Print Network (OSTI)

simulations 0 1.0 1.50.5 2.0 Two focal zooms during implosion G = 10* *Gives Recirculating power = 25% >Laser efficiency = KrF = 7.0% > Thermal efficiency = 40% > Blanket Burnup = = 1.1 #12;Simulations predict enough gain for a power plant with only a 529 kJ. KrF driver (

389

A Comprehensive Overview of the Applications of Artificial Life  

E-Print Network (OSTI)

@cs.yonsei.ac.kr sbcho@cs.yonsei.ac.kr Keywords Artificial life, perspective, simulation, software, hardware, evolutionA Comprehensive Overview of the Applications of Artificial Life Kyung-Joong Kim Sung-Bae Cho Abstract We review the applications of artificial life (ALife), the creation of synthetic life on computers

Kim, Kyung-Joong

390

PRINCETON PLASMA PHYSICS LABORATORY PRINCETON UNIVERSITY, PRINCETON, NEW JERSEY  

E-Print Network (OSTI)

silicon prototype window, coated with 500 nm thin- #12;Ms-270102 3 film silicon nitride (Si3N4), has been Development of a Silicon Based Electron Beam Transmission Window for Use in a KrF Excimer Laser System by C transmission window for use in a KrF excimer laser system C. A. Gentilea) , H. M. Fana) , J. W. Hartfielda) , R

391

Private Top-Aggregation Protocols Myungsun Kim1  

E-Print Network (OSTI)

- items, data privacy, user privacy 1 Introduction Privacy has become a big concern in many applications jhcheon@snu.ac.kr 4 Department of Electrical Engineering Korea Advanced Institute of Science and Technology yongdaek@ee.kaist.ac.kr Abstract. In this paper, we revisit the private top- data aggregation

392

FRACTIONAL SKEW MONOID RINGS P. ARA, M.A. GONZ  

E-Print Network (OSTI)

FRACTIONAL SKEW MONOID RINGS P. ARA, M.A. GONZ â?? ALEZ­BARROSO, K.R. GOODEARL, AND E. PARDO FQM­298 of the Junta de Andalucâ??�a. 1 #12; 2 P. ARA, M.A. GONZ â?? ALEZ­BARROSO, K.R. GOODEARL, AND E

Bigelow, Stephen

393

Distillation purification and radon assay of liquid xenon  

SciTech Connect

We succeeded to reduce the Kr contamination in liquid xenon by a factor of 1/1000 with a distillation system in Kamioka mine. Then, the remaining radioactivities (Radon and Kr) in purified liquid xenon were measured with the XMASS prototype detector. In this talk, the distillation system and the remaining internal radioactivity levels are reported.

Takeuchi, Yasuo [Kamioka Observatory, ICRR, Univ. of Tokyo, Kamioka-cho, Hida-shi, Gifu 506-1205 (Japan)

2005-09-08T23:59:59.000Z

394

CompensatorDPWM ADCe[n]d[n  

E-Print Network (OSTI)

is usually sized based on the energy storage requirement during large load transients [6 - MS SR vout(t) + - Optimal response circuit clk. divider & s.s. generator clk D fsw_f = kR(1-D) kR Fig.1: Adaptive switching frequency PWM controller regulating operation of a buck converter. ADAPTIVE

Prodiæ, Aleksandar

395

The Sg-1 Glycosyltransferase Locus Regulates Structural Diversity of Triterpenoid Saponins of Soybean  

Science Journals Connector (OSTI)

...reproductive tissues of legume plants (Price et al., 1986; Shiraiwa et...298-306. Fenwick, G.R. , Price, K.R., Tsukamoto, C...Cell Rep. 25 : 206-213. Price, K.R. , Curl, C.L...1997). Involvement of ethylene in chromosaponin-induced stimulation...

Takashi Sayama; Eiichiro Ono; Kyoko Takagi; Yoshitake Takada; Manabu Horikawa; Yumi Nakamoto; Aya Hirose; Hiroko Sasama; Mihoko Ohashi; Hisakazu Hasegawa; Teruhiko Terakawa; Akio Kikuchi; Shin Kato; Nana Tatsuzaki; Chigen Tsukamoto; Masao Ishimoto

2012-05-18T23:59:59.000Z

396

Impact of Staphylococcus aureus on Pathogenesis in Polymicrobial Infections  

Science Journals Connector (OSTI)

...004 . 25. Varma P , N Nisha, KR Dinesh, AV Kumar, and R Biswas. 2011. Anti-infective...Rohinivilasam Vasukutty, A Bal, and H Kumar. 2010. Spectrum and prevalence...174.5.1058 . 78. Varma P , KR Dinesh, KK Menon, and R Biswas. 2010...

Nisha Nair; Raja Biswas; Friedrich Götz; Lalitha Biswas

2014-03-18T23:59:59.000Z

397

Int. J. Mol. Sci. 2012, 13, 5138-5162; doi:10.3390/ijms13045138 International Journal of  

E-Print Network (OSTI)

-dong, Jinju, 660-701, Korea; E-Mails: suguna@bio.gnu.ac.kr (S.S.); megac@bio.gnu.ac.kr (C.M.); ysohn@bio obesity. Cortisol is an important regulator of fuel metabolism during the starvation and stress which

Lee, Keun Woo

398

S a n d i a N a t i o n a l L a b o r a t o r i e s Pulsed Power Inertial Fusion Energy  

E-Print Network (OSTI)

/integration issues 3 Drivers Pulsed power magnetic pressure Pulsed power x-rays Fast Ignition Laser Heavy Ion power magnetic pressure Pulsed power x-rays Fast Ignition Laser Heavy Ion Accelerator DPSSL Laser Kr Accelerator DPSSL Laser KrF Laser Coupling Conductor transport-conductor recycling Beam transport

399

BOOSTED BINARY AUDIO FINGERPRINT BASED ON SPECTRAL SUBBAND MOMENTS Sungwoong Kim and Chang D. Yoo  

E-Print Network (OSTI)

BOOSTED BINARY AUDIO FINGERPRINT BASED ON SPECTRAL SUBBAND MOMENTS Sungwoong Kim and Chang D. Yoo@kaist.ac.kr, cdyoo@ee.kaist.ac.kr ABSTRACT An audio fingerprinting system identifies an audio based on a unique feature vector called the audio fingerprint. The performance of an audio fingerprinting system is directly

Yoo, Chang D.

400

Ion-induced phase transition in thin Co films  

Science Journals Connector (OSTI)

Rectangular 75 nm thick Co films were irradiated with 200 keV Xe-ions, to fluences of 2.5×1013–8×1015 ions/cm2. The film thickness and the implanted Xe profiles, the phase structure and ion-induced lattice dilations as well as the magnetic hysteresis patterns were measured. For lower fluences up to 4×1014 Xe/cm2, we found predominantly the HCP phase with an in-plane magnetization. The transition to the four-fold in-plane magnetization typical of the FCC phase occurred at a fluence range between 4×1014/cm2 and 2×1015/cm2.

Kun Zhang; R Gupta; K.P Lieb; Y Luo; G.A Müller; P Schaaf; M Uhrmacher

2004-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "uus kr xe" 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.


401

Decay Energies of Gaseous Fission Products and their Daughters for A=88 to 93  

Science Journals Connector (OSTI)

A systematic study of ?-decay energies has been made for mass-separated activities of Kr gaseous fission products and their daughters at the TRISTAN on-line separator facility at the Ames Laboratory research reactor. A well-type plastic scintillator was used in coincidence with a Ge(Li) ? detector to determine ?-group end-point energies and deduce Q values. The following ?-decay energies have been determined: Kr88, 2.93 ± 0.03 MeV; Rb88, 5.30 ± 0.06 MeV; Kr89, 4.93 ± 0.06 MeV; Kr90, 4.35 ± 0.05 MeV; Rb90, 6.32 ± 0.07 MeV; Kr91, 6.12 ± 0.07 MeV; Rb91, 5.68 ± 0.04 MeV; Kr92, 5.97 ± 0.08 MeV; Rb92, 7.58 ± 0.15 MeV; Sr92, 1.93 ± 0.03 MeV; Kr93, 8.3 ± 0.5 MeV; and Rb93, 7.23 ± 0.10 MeV. The decay energies are compared with previous measurements, systematics predictions, and two currently accepted mass relations. The energies are used to predict the ?-decay energies for 13 additional nuclei by means of systematics.

J. R. Clifford; W. L. Talbert; Jr.; F. K. Wohn; J. P. Adams; J. R. McConnell

1973-06-01T23:59:59.000Z

402

SUPPORTING INFORMATION Multicolored vertical silicon nanowires  

E-Print Network (OSTI)

. The nanowires have radii of about 50 nm and are 1 µm long. Light from a Xe arc lamp was focused into an optical on the single crystalline silicon wafer. Inductively coupled plasma- reactive ion etch (STS) was used

403

SUPPORTING INFORMATION Chromatic Plasmonic Polarizers for Active Visible Color  

E-Print Network (OSTI)

that was used to image the transmission through the CPP samples. Light from a Xe arc lamp was focused glass slides were cleaned by solvent and oxygen plasma and covered with poly(methyl methacylate

404

Mechanisms of neutrinoless double-beta decay: A comparative analysis of several nuclei  

Science Journals Connector (OSTI)

The neutrinoless double beta decay of several nuclei that are of interest...76Ge, 82Se, 100Mo, 130Te, and 136Xe) is investigated on the basis of a general Lorentzinvariant effective Lagrangian describing physics ...

A. Ali; A. V. Borisov; D. V. Zhuridov

2010-12-01T23:59:59.000Z

405

Oriel UV Exposure Station  

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

and a mask holder for standard 5" x 5" optical masks. Capabilities: Light Source 1000 Watt Hg(Xe) lamp Wavelength range: 220-450 nm Digital timer for exposure control with...

406

Nuclear Instruments and Methods in Physics Research A 515 (2003) 166179 Aging studies for the ATLAS Transition Radiation Tracker (TRT)  

E-Print Network (OSTI)

emphasis is put on the different phenomena observed in straw tubes operating with the chosen Xe=CF4=CO2 rights reserved. Keywords: TRT; Proportional chamber; Straw; Aging; Gold damage; Etching; CF4 1

Eerola, Paula

407

Discrimination of nuclear explosions against civilian sources based on atmospheric xenon isotopic activity ratios  

SciTech Connect

A global monitoring system for atmospheric xenon radioactivity is being established as part of the International Monitoring System that will be used to verify compliance with the Comprehensive Nuclear-Test-Ban Treaty (CTBT) once the treaty has entered into force. This paper studies isotopic activity ratios to support interpretation of observed atmospheric concentrations of 135Xe, 133mXe, 133Xe and 131mXe. The goal is to distinguish nuclear explosion sources from civilian releases. Simulations of nuclear explosions, empirical data for both test and reactor releases as well as observations by measurement stations of the International Noble Gas Experiment (INGE) are used to provide a proof of concept for the isotopic ratio based method for source discrimination.

Kalinowski, Martin B.; Axelssson, A.; Bean, Marc; Blanchard, X.; Bowyer, Ted W.; Brachet, G.; McIntyre, Justin I.; Peters, Jana; Pistner, Christoph; Raith, Maria; Ringbom, Anders; Saey, P. R.; Schlosser, C.; Stocki, Trevor J.; Taffary, T.; Ungar, R. Kurt

2010-05-01T23:59:59.000Z

408

Effect of helium addition on discharge characteristics in a flat fluorescent lamp  

SciTech Connect

The discharge characteristics of a multielectrode dual coplanar in a mercury-free flat fluorescent lamp were investigated using brightness-efficiency measurement and the infrared (IR) spectrum and intensified charge coupled device (ICCD) characteristics. The level of brightness was above 14 900 cd/m{sup 2} under the conditions of neon--50% xenon-8% He gas composition, 150 Torr pressure, and 20 kHz alternating current pulse. The ICCD results revealed a faster and wider discharge with a Ne-50% Xe-8% He gas composition. The effect of adding helium (He) to Ne-50% Xe revealed a faster peak emission, as confirmed by ICCD images. From the gated IR emission spectrum, the intensity ratio of I{sub 823nm}/I{sub 828nm} was {approx}8% higher with Ne-50% Xe-8% He than with Ne-50% Xe under the same pressure and applied voltage conditions.

Lee, Seong-Eui; Lee, Ho-Nyeon; Park, Hyoung-Bin; Lee, Kyo Sung; Choi, Kyung Cheol [Materials and Devices Research Center, Samsung Advanced Institute of Technology, Suwon 440-600 (Korea, Republic of); Department of Electronics Engineering, Sejong University, Seoul 143-747 (Korea, Republic of); Department of Electrical Engineering and Computer Science, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-701 (Korea, Republic of)

2005-11-01T23:59:59.000Z

409

Download Full-text PDF  

Science Journals Connector (OSTI)

conductor, it cuts the vertical lines of the e=6xE, earth's magnetic field and an electromotive. E = VII, L x 10-a v, force is generated by electromagnetic in- duction.

2000-02-11T23:59:59.000Z

410

X-ray diffraction from intraneuronal paired helical filaments and extraneuronal amyloid fibers in Alzheimer disease indicates cross-beta conformation  

Science Journals Connector (OSTI)

...light and electron microscopic particle counts. The remaining particles were small aggre- gates of...il t v X~e. r , . 4 a _% god By e I'd...and fluorescence-activated particle sorting (21). (Bar = 2...

D A Kirschner; C Abraham; D J Selkoe

1986-01-01T23:59:59.000Z

411

E-Print Network 3.0 - absorption lidar sensitivity Sample Search...  

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

has been modified in recent years (McGee et al., 1991, 1993,20 1995). A Xe... . The NASA God- dard Space Flight Center (GSFC) mobile lidar system was deployed at the Observa-...

412

Metal and metal-free photocatalysts: mechanistic approach and application as  

E-Print Network (OSTI)

.g., household fluorescence or LED bulbs, halogen lamps, sunlight, Xe lamp), e.g., enantioselective alkylation.lalevee@uha.fr * Corresponding author Keywords: LEDs; photoinitiators; photopolymerization; photoredox catalysis Beilstein J. Org

Boyer, Edmond

413

Study of the occupied and unoccupied electronic states of the Y-substituted (Bi,Pb)-2223 high temperature superconductor  

Science Journals Connector (OSTI)

Spectra for the filled and unfilled electronic states of the (Bi,Pb)-2223 high temperature superconductor were recorded by photoemission and fluorescence X-...E F...and at 1.5 eV binding energy wi...

C. Janowitz; A. Müller; A. Krapf; W. Frentrup; H. Dwelk…

1997-04-01T23:59:59.000Z

414

I. Nuclear Production Reaction and Chemical Isolation Procedure for 240Am II. New Superheavy Element Isotopes: 242Pu(48Ca,5n)285-114  

E-Print Network (OSTI)

A. Wilmarth, and Glenn T. Seaborg. Actinide production in XeJames W. Cobble, and Glenn T. Seaborg. Spallation-fissionA, 216(1):97 – 108, 1973. Glenn T. Seaborg. The transuranium

Ellison, Paul Andrew

2011-01-01T23:59:59.000Z

415

Secondary Organic Aerosol Formation From Aromatic Hydrocarbon  

E-Print Network (OSTI)

Edney E.O. Izumi K. Sato K. 244 cm fluorescent bulbs 244cm fluorescent bulbs 1.6 kW Xe lamps 19 kW xenon arc lamps

Tang, Ping

2013-01-01T23:59:59.000Z

416

Genomic amplification of a decoy receptor for Fas ligand in lung and colon cancer  

Science Journals Connector (OSTI)

... AFM218xe7 (T160), which is linked to DcR3 (likelihood score = 5.4), SHGC-36268 (T159), the nearest available marker which maps to ?500 kilobases from T160 ...

Robert M. Pitti; Scot A. Marsters; David A. Lawrence; Margaret Roy; Frank C. Kischkel; Patrick Dowd; Arthur Huang; Christopher J. Donahue; Steven W. Sherwood; Daryl T. Baldwin; Paul J. Godowski; William I. Wood; Austin L. Gurney; Kenneth J. Hillan; Robert L. Cohen; Audrey D. Goddard; David Botstein; Avi Ashkenazi

1998-12-17T23:59:59.000Z

417

IR Spectra of Dense Xenon and Argon Plasmas  

Science Journals Connector (OSTI)

The results are presented of experimental studies of IR radiation spectra of dense Xe and Ar shock compressed plasmas. The radiation cutoff is found at the wavelength ??1?mThe experimental data are interpreted...

V. E. Fortov; M. U. Kulish; V. B. Mintsev; J. Ortner…

1992-01-01T23:59:59.000Z

418

Table of Contents  

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

IV: ATOMIC AND MOLECULAR SCIENCE Target Z-dependence of Cross Sections for Multiple Electron Loss by 6 A MeV Xe18+ Ions R. L. Watson, Y. Peng, and V. Horvat Additivity of Cross...

419

Gravity waves in a rotating basin - normal modes  

E-Print Network (OSTI)

248) CORA FORMAT tfHO ~ 35Xe3)HCORIOLIS &F) (RADXSEC) WRfTE (6e200) WRfTE(6e249) F'ORMAT&IHO ~ 50X ~ 19HRAOIUS VSe VELOCITYPP) WRITE (6e25()) FORMAT t'IH ~ 53XefAHGULF OF ME)(ICO/'t) WRITE (6e251) FORMAT &)HOT 57XeBH(ROC)Z8Y/) WRITE &6e 252...248) CORA FORMAT tfHO ~ 35Xe3)HCORIOLIS &F) (RADXSEC) WRfTE (6e200) WRfTE(6e249) F'ORMAT&IHO ~ 50X ~ 19HRAOIUS VSe VELOCITYPP) WRITE (6e25()) FORMAT t'IH ~ 53XefAHGULF OF ME)(ICO/'t) WRITE (6e251) FORMAT &)HOT 57XeBH(ROC)Z8Y/) WRITE &6e 252...

Royer, Thomas Clark

2012-06-07T23:59:59.000Z

420

First decay study of the very neutron-rich isotope 93Br  

Science Journals Connector (OSTI)

The decay of the mass-separated, very neutron-rich isotope 93Br has been studied by ? spectroscopy. A level scheme of its daughter 93Kr has been constructed. Level energies, ?-ray branching ratios, and multipolarities suggest spins and parities which are in accord with a smooth systematics of the N=57 isotones for Z<~40, suggesting the N=56 subshell closure still to be effective in Kr isotopes. So far, there is no indication of a progressive onset of deformation in neutron-rich Kr isotopes.

G. Lhersonneau; A. Wöhr; B. Pfeiffer; K.-L. Kratz; the ISOLDE Collaboration

2001-02-20T23:59:59.000Z

Note: This page contains sample records for the topic "uus kr xe" 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.


421

Alexis Michaud* Guillaume Jacques**Robert L. Rankin*** * (LACITO-CNRS)  

E-Print Network (OSTI)

Jackson 1986 : 801, §1142 *tnow traoñ (IPA:/trãõ//tãõ/) *cnow (IPA:/*know/) kraoñ (IPA: /krãõ() grõhuw -- gnúis grui (IPA:[gris]) -- gnusachtach grsat -- cnáip kræb' -- cnáim; cnàimh kræ v kra 2 ( )( Prinmi) 5 IPA /i//i/ halshs-00915473,version1-8Dec2013 #12;2014 /grebla /)*-pna( [Dorsey 1885

Paris-Sud XI, Université de

422

Continuous-time model reference adaptive control with improved transient performance  

E-Print Network (OSTI)

) for any piecewise continuous, uniformly bounded reference input signal r(t). In order to meet the control objective, we make the following standard assump- tions [26, 53] concerning the plant Gp(s) and the reference model I4 (s) ~ (Al) Rp(s) is a monic... polynomial of degree n. ~ (A2) Zp(s) is a monic Hurwitz polynomial of degree n, ( n. ~ (A3) The sign of kr and an upper bound k, ) 0 on [k?[ are known. Without any loss of generality, kr is assumed to be positive. Thus kr ( k ~ (A4) The relative degree n...

Ho, Ming-Tzu

1993-01-01T23:59:59.000Z

423

INFINITE GENERATION FOR RINGS OF SYMMETRIC TENSORS  

E-Print Network (OSTI)

N.I. Shepherd-Barron DPMMS, 16 Mill Lane, Cambridge CB2 1SB, UK If X.I. SHEPHERD-BARRON Put x = Xe, and let p, q : Xe ! be the two projections; then 1eX~= p* 1 q* 1 as -linearized bundles, so that by descent 1X ~=O(A) O(B) for some divisor classes A, B on X. Lemma 1. h0(O

Shepherd-Barron, Nick

424

Shell model estimate of electric dipole moment in medium and heavy nuclei  

SciTech Connect

The nuclear electric dipole moment (EDM) and the nuclear Schiff moment for the lowest 1/2{sup +} state of {sup 129}Xe are investigated in terms of the nuclear shell model. We estimate the upper limit for the EDM of neutral {sup 129}Xe atom using the Schiff moment. We also estimate the upper limit of the nuclear EDM, which may be directly measured through ionic atoms.

Yoshinaga, Naotaka [Department of Physics, Saitama University, Saitama City 338-8570 (Japan); Higashiyama, Koji [Department of Physics, Chiba Institute of Technology, Narashino, Chiba 275-0023 (Japan)

2011-05-06T23:59:59.000Z

425

SPECTRAL ANALYSIS OF RADIOXENON  

SciTech Connect

Monitoring changes in atmospheric radioxenon concentrations is a major tool in the detection of an underground nuclear explosion. Ground based systems like the Automated Radioxenon Sampler /Analyzer (ARSA), the Swedish Unattended Noble gas Analyzer (SAUNA) and the Automatic portable radiometer of isotopes Xe (ARIX), can collect and detect several radioxenon isotopes by processing and transferring samples into a high efficiency beta-gamma coincidence detector. The high efficiency beta-gamma coincidence detector makes these systems highly sensitive to the radioxenon isotopes 133Xe, 131mXe, 133mXe and 135Xe. The standard analysis uses regions of interest (ROI) to determine the amount of a particular radioxenon isotope present. The ROI method relies on the peaks of interest falling within energy limits of the ROI. Some potential problems inherent in this method are the reliance on stable detector gains and a fixed resolution for each energy peak. In addition, when a high activity sample is measured there will be more interference among the ROI, in particular within the 133Xe, 133mXe, and 131mXe regions. A solution to some of these problems can be obtained through spectral fitting of the data. Spectral fitting is simply the fitting of the peaks using known functions to determine the number and relative peak positions and widths. By knowing this information it is possible to determine which isotopes are present. Area under each peak can then be used to determine an overall concentration for each isotope. Using the areas of the peaks several key detector characteristics can be determined: efficiency, energy calibration, energy resolution and ratios between interfering isotopes (Radon daughters).

Cooper, Matthew W.; Bowyer, Ted W.; Hayes, James C.; Heimbigner, Tom R.; Hubbard, Charles W.; McIntyre, Justin I.; Schrom, Brian T.

2008-09-23T23:59:59.000Z

426

ECOLE PRATIQUE DES HAUTES ETUDES Mention Histoire, textes et documents  

E-Print Network (OSTI)

Etude diachronique du système verbal persan (Xe -XVIe siècles) : d'un équilibre à l'autre ? Agnès changements morphologiques et syntaxiques du système verbal persan entre les Xe et XVIe siècles. Dix textes en prose représentatifs (régions et dialectes, judéo-persan compris) ont pu faire apparaître les évolutions

Paris-Sud XI, Université de

427

States and Their Transitions The tuple  

E-Print Network (OSTI)

When the average is a moving average, a different technique is needed (Kao (R89723057) and Lyuu (2003)). c 2014 analytical solutions are the Black-Scholes formulas: C = Se-qa N(x) - Xe-r N(x - a ), (33) P = Xe-r N(-x + a ) - Se-qa N(-x), (33 ) ­ With the volatility set to a / 3 . ­ With the dividend yield set to qa (r + q

Lyuu, Yuh-Dauh

428

arXiv:1205.5608v1[hep-ex]25May2012 Search for Neutrinoless Double-Beta Decay in 136  

E-Print Network (OSTI)

arXiv:1205.5608v1[hep-ex]25May2012 Search for Neutrinoless Double-Beta Decay in 136 Xe with EXO-200: May 28, 2012) We report on a search for neutrinoless double-beta decay of 136 Xe with EXO-200 in the ±1 region of interest. This sets a lower limit on the half-life of the neutrinoless double-beta decay

Gratta, Giorgio

429

Isospin Effects of the Critical Behavior in the Lattice Gas Model  

E-Print Network (OSTI)

Isospin effects of the critical phenomena were studied via Xe isotopes in the frame of lattice gas model. All the critical temperatures for four Xe isotopes are close to 5.5 MeV at the same freeze-out density of about 0.39 $\\rho_0$. The critical values of power law parameter of mass distribution, mean multiplicity of intermediate mass fragments (IMF), information entropy and Campi's second moment show minor dependence on the isospin at the critical point.

Yu-Gang Ma; Qian-Min Su; Wen-Qing Shen; Jian-Song Wang; Xiang-Zhou Cai; De-Qing Fang

1999-04-21T23:59:59.000Z

430

Chapter 13 - Actinide host phases as radioactive waste forms  

Science Journals Connector (OSTI)

Publisher Summary An effective strategy for dealing with high-level waste is to partition the short-lived fission product elements from the long-lived actinides, creating separate waste streams. Once there are two waste streams, the properties and durability of the waste form can be designed to a level appropriate to the toxicity and time required for isolation from the environment. With such a strategy the fission product elements may be incorporated into a borosilicate glass and the actinides into more durable crystalline ceramics. Although special glass compositions may be developed for actinide incorporation, their long-term durability is less easily assured, particularly on the time scales required for actinide immobilization and confinement. The final selection of any waste form should depend on its ability to incorporate the radionuclides of interest, its chemical durability, response to a radiation-field, and physical properties as well as the time required for isolation to protect the environment. There are three significant types of actinide-containing materials generated by the nuclear fuel cycle that contain high levels of radioactivity: 1.) spent nuclear fuel (SNF) related to the production of fissile material for weapons, 2.) SNF from commercial nuclear reactors, 3.) liquid high-level waste (HLW) derived during the reprocessing of SNF [1]. Unreacted fuel constituents (235,238U) make up approximately 96% of total mass of SNF. A major fraction of activity of SNF comes from fission product (FP) elements with mass numbers from 85 to 106 and from 125–147 (Kr, Sr, Y, Zr, Tc, Ru, Y, Sb, Cs, Ba, Ce, Pm, etc.), unreacted fuel (U), “minor” actinides (Np, Pu, Am, Cm), and activated products (H, C, Al, Na, Mn, Fe, Co). \\{FPs\\} consist of about 200 isotopes of approximately 40 elements from Zn to Gd. The yield of individual radionuclides ranges between 104 % to several percent (a yield of 1 % corresponds to production of 1 atom of daughter isotope per 100 events of nuclear decay of 235U or 239Pu). The fraction of individual radionuclides in SNF varies depending on the type of reactor, burn-up and cooling time. From point of view of radiobiological risk the following groups of radionuclides are important:u• Short-lived \\{FPs\\} which are almost completely decayed to stable isotopes after a cooling of SNF for some tens of years: Rb, Y, Mo, Ru, Rh, Ag, Sb, Te, Xe, Ba, La, Ce, Pr, Nd, Pm. Their amount in total is 26 kg per metric tone (MT) of SNF or 65 wt.% of the total \\{FPs\\} amount; • \\{FPs\\} with high specific activity: mainly 90Sr and 137Cs; their total content is up to 6 kg per 1 MT of SNF (about 15 wt.% of total FPs); • Long-lived \\{FPs\\} with low specific activity: Zr, Tc, Pd, Sn, I (about 8 kg per 1 MT of SNF or about 20 wt.% of total FPs); • Actinides (Np, Pu, Am, Cm) and their daughter products which are less than 1 wt.% and dominated by Pu; • Unreacted constituents: 238U - 98.9 wt.% and 235U -1.1 wt.% of total.

Sergey V. Yudintsev; Sergey V. Stefanovsky; Rodney C. Ewing

2007-01-01T23:59:59.000Z

431

Discovery of an unusual biosynthetic origin for circular proteins in legumes  

Science Journals Connector (OSTI)

...found in Oldenlandia affinis DC. An indigenous, Congolese drug “Kalata-Kalata” used to accelerate the delivery . Medd Norsk Farm Selskap 32 : 173 – 180 . 3 Gustafson KR ( 1994 ) Circulins A and B: Novel HIV-inhibitory macrocyclic peptides from...

Aaron G. Poth; Michelle L. Colgrave; Russell E. Lyons; Norelle L. Daly; David J. Craik

2011-01-01T23:59:59.000Z

432

E-Print Network 3.0 - al asp och Sample Search Results  

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

facksprak inom teknik, Summary: ;aterstoden h"arr"or fran f"ors"al* *jning av b"ocker och tj"anster samt anslag till olika forskningsprojekt. N... det genomf"orde* *s, kr"ava en...

433

Hanford Sitewide Probabilistic Seismic Hazard Analysis  

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

and spatial variation of recurrence (Section 8.3.2.9). 5.4 References Baker VR, BN Bjornstad, AJ Busacca, KR Fecht, EP Kiver, UL Moody, JG Rigby, DF Stradling, and AM Tallman....

434

Pre-clinical Measures of Eye Damage (Lens Opacity), Case-control Study of Tuberculosis, and Indicators of Indoor Air Pollution from Biomass Smoke  

E-Print Network (OSTI)

K.R. , Biofuels, Air Pollution and Health: A Global Review.K.R. , Biofuels, Air Pollution and Health: A Global Review.K.R. , Biofuels, Air Pollution and Health: A Global Review.

Pokhrel, Amod Kumar

2010-01-01T23:59:59.000Z

435

Linewidth dependence of critical current density in Y1Ba2Cu307 thin-film microbridges  

E-Print Network (OSTI)

penetration depth Aeff = A,"/& where 6 is the film thickness and A2,the penetration depth for shielding. The excimer laser was operated with KrF at 248 nm with a repetition rate of 25 Hz. Films with uniformity

Economou, Demetre J.

436

Biologia 63/6: 791--798, 2008 Section Botany  

E-Print Network (OSTI)

& G¨artner was originally described as Chlorella reniformis by Watanabe (1977) from a Japanese soil, which was originally designated as Chlorella saccha- rophila (Kr¨uger) Migula. They concluded

437

Cryogenic  

Science Journals Connector (OSTI)

\\?kr?-?-?je-nik\\ adj...(1896) Pertaining to very low temperatures, usually temperatures below about –150°C (123 K). Evaluations of plastics at cryogenic temperatures are conducted for potential space applications...

Jan W. Gooch

2011-01-01T23:59:59.000Z

438

Cryogenic  

Science Journals Connector (OSTI)

\\¦kr?-?-¦je-nik\\ (1896) adj.... Pertaining to very low temperatures, usually temperatures below about ?150°C (123?K). Evaluations of plastics at cryogenic temperatures are conducted for potential space applicatio...

2007-01-01T23:59:59.000Z

439

High Rydberg Atoms: Newcomers to the Atomic Physics Scene  

Science Journals Connector (OSTI)

...HYDROGEN ATOM, NUCLEAR FUSION 5 : 41 ( 1965 ). BAYFIELD...HIGHLY-EXCITED KR ATOMS BY HF AND HCL MOLECULES, BULLETIN...USING A CW TUNABLE DYE LASER, PHYSICAL REVIEW LETTERS...such diverse fields as laser development, laser isotopeseparation, energy...

Ronald F. Stebbings

1976-08-13T23:59:59.000Z

440

ENERGY AND ENVIRONMENT DIVISION ANNUAL REPORT 1978  

E-Print Network (OSTI)

mixture consisted of 3He, Kr and CF4. The 3He was used as anand sample container, and CF4 acted as a carrier for gaspurging the sample line with CF4 before water samples were

Cairns, E.L.

2011-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "uus kr xe" 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.


441

GEOHYDROLOGICAL STUDIES FOR NUCLEAR WASTE ISOLATION AT THE HANFORD RESERVATION -- Vol. I: Executive Summary; Vol. II: Final Report  

E-Print Network (OSTI)

consisted of 3He, Kr and CF4. The 3He was in the sampleinternal standard and CF4 buffer gas. b DC-2flushed with30 and sample· container, and CF4 acted as a carrier for gas

Apps, J.

2010-01-01T23:59:59.000Z

442

Pre-clinical Measures of Eye Damage (Lens Opacity), Case-control Study of Tuberculosis, and Indicators of Indoor Air Pollution from Biomass Smoke  

E-Print Network (OSTI)

Indoor air pollution from biomass fuels and respiratoryTuberculosis and Indoor Biomass and Kerosene Use in Nepal: AR.D. Retherford, and K.R. Smith, Biomass cooking fuels and

Pokhrel, Amod Kumar

2010-01-01T23:59:59.000Z

443

Reports and other Publications  

Science Journals Connector (OSTI)

... (Rome: International Council of Scientific Unions, 1965.) 1.50 dollars., [193Norsk Polarinstitutt. Arbok 1963. Pp.267. (Oslo: ... Polarinstitutt. Arbok 1963. Pp.267. (Oslo: Norsk Polarinstitutt. Obtainable from Universitetsforlaget, Postboks 307, Blindern, Oslo.) 35 kr. [193 ...

1965-05-29T23:59:59.000Z

444

Reports and other Publications  

Science Journals Connector (OSTI)

... Institute of International Studies, University of California, 1965.) 2.95 dollars. [43Norsk Polarinstitutt. Arbok 1964. Pp.242. (Oslo: ... Polarinstitutt. Arbok 1964. Pp.242. (Oslo: Norsk Polarinstitutt, 1966.) 30 kr. [43 ...

1966-05-07T23:59:59.000Z

445

Reports and other Publications  

Science Journals Connector (OSTI)

... 11 figures. (Kjeller : Institut for Atomenpirui, Kjeller Research Establishment, 1964.) [211Norsk Polarinstitutt. Meddelelser, Nr. 91 : Mesozoiske 0glefunn fra Norge og Svalbard. (Mesozoic ... Bear in Svalbard.) Av Anatol Heintz. Pp. 40. 4 kr. (Oslo : Norsk Polarinstitutt, 1964.) [211

1964-12-19T23:59:59.000Z

446

E-Print Network 3.0 - acid peroxide pmo Sample Search Results  

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

zeolite... with Sulfonic Acid Group Xingdong Yuan, Hyung Ik Lee, Jin Won Kim, Jae Eui Yie and Ji Man Kim * Functional... -mail: jimankim@ajou.ac.kr ABSTRACT Sulfonic acid...

447

Avalanche-like behavior in ciliary import  

Science Journals Connector (OSTI)

...Cell Biology, University of Massachusetts Medical School, Worcester...turbulence in plasmas (14) to solar flares (15), earthquakes (16...McTiernan J Bromund KR ( 1993 ) Solar flares and avalanches in driven...the temporal occurrence of solar flares . Phys...

William B. Ludington; Kimberly A. Wemmer; Karl F. Lechtreck; George B. Witman; Wallace F. Marshall

2013-01-01T23:59:59.000Z

448

Palaeoclimate Coordinating Lead Authors  

E-Print Network (OSTI)

6 Palaeoclimate Coordinating Lead Authors: Eystein Jansen (Norway), Jonathan Overpeck (USA) Lead (UK) This chapter should be cited as: Jansen, E., J. Overpeck, K.R. Briffa, J.-C. Duplessy, F. Joos, V

449

News and Notes  

Science Journals Connector (OSTI)

...more than twice present prices) coal, oil, and gas would be exhausted...utilization for house heating, water heating, and...photosyn-thetic microorganisms. Connecticut Agricultural Experiment...Publication No. 7. The price per copy is 35,00 kr...

1954-01-15T23:59:59.000Z

450

3He Cross Section  

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

, X) (Current as of 05142012) NSR Reaction E (MeV) Cross Section File X4 Dataset Date Added 1982KR05 3He(, ): Ecm 107 - 1266 keV X4 01052012 1969NA24 3He(, ):...

451

E-Print Network 3.0 - al sistema cubano Sample Search Results  

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

S inferiore al 2% e valutare il... tempo di assestamento (al 5%) del sistema. - y ia u + . KR m Ka ia e a Figura 1 Problema 2 - Si... casi K > 0 e K < 0 il diagramma di...

452

Numerical Simulation of Liquid-Solid, Solid-Liquid Phase Change Using Finite Element Method in h,p,k Framework with Space-Time Variationally Consistent Integral Forms  

E-Print Network (OSTI)

: cp@T@t r (krTs) = 0 8(x;t) 2 sxt = sx t = sx (0; ) (2.1) Liquid Phase: cp@T@t r (krTl) = 0 8(x;t) 2 lxt = lx t = lx (0; ) (2.2) At the interface: Lfvn = [( krTs) ( krTl)] n 8(x;t) 2 x;t = x t (2.3) 10 in which sx and lx are solid... and liquid spatial domains, x(t) = sxT lx is the interface between the two phases, Lf is the latent heat of fusion,n is the unit exterior normal from the solid phase at the interface, and vn is the normal velocity of the interface. Subscripts s and l...

Truex, Michael

2010-07-21T23:59:59.000Z

453

ALGEBRA HOMOLOGICZNA, WYK#AD 13 Zak#adamy, #e X jest normaln# przestrzeni# topologiczn#.  

E-Print Network (OSTI)

). Wtedy mamy kr#tki ci#gh dok#adny snop#w 0 ! F ! I ! G, kt#ry daje nam d#ugi ci#g dok#adny grup abelowych

Kowalski, Piotr

454

Enhanced killing of pancreatic cancer cells by expression of fusogenic membrane glycoproteins in combination with chemotherapy  

Science Journals Connector (OSTI)

...and Medical Virology, Institute of Microbiology and Hygiene, Ruhr-University Bochum...Freytag SO, Rogulski KR, Paielli DL, Gilbert JD, Kim JH. A novel three-pronged...and Medical Virology, Institute of Microbiology and Hygiene, Ruhr-University Bochum...

Dennis Hoffmann and Oliver Wildner

2006-08-01T23:59:59.000Z

455

Center for Inverse Design: Publications  

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

K.R. Poeppelmeier, J. Chem. Phys. 138, 194703 (2013). DOI: 10.10631.4804556 Modality 2: TCO-Non-spinel materials Li-doped Cr2MnO4: A new p-type transparent conducting oxide by...

456

E-Print Network 3.0 - acoustic source strength Sample Search...  

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

Underwater Vehicles Laboratory, MIT Sea Grant Collection: Engineering 80 Vibro-Acoustics Consortium Assessment of Numerical Models and Summary: sources BE mesh r vn p A r ej t kr...

457

Official Publications Received  

Science Journals Connector (OSTI)

... , Nr. 3: The Godthaab Expedition 1928â The Hydrographic Vork and Material. By Eigel-Riis-Carstensen. Pp. 101+12 plates. 6.00 kr. Band 80, Nr. 1 ...

1936-08-01T23:59:59.000Z

458

The effect carbohydrate consumption on Argentine ants' nutritional ecology  

E-Print Network (OSTI)

and ants. Annual Review of Ecology and Systematics, 18, 111-an invasive mealybug. Ecology, 83, 2425-2438. Helms, K.R. &invasions. Annual Review of Ecology and Systematics, Kaplan,

Chou, Cheng T.

2009-01-01T23:59:59.000Z

459

High Energetic Deuteron Ion Irradiation of Al Samples by Dense Plasma Focus Device  

Science Journals Connector (OSTI)

In this paper energetic ion beams of a 90 kJ filippov type plasma focus were utilized to irradiation aluminum samples. The...2, and D2+Kr2%. The phenomena of melting, micro cracks, evaporation, and sputtering of ...

M. Habibi; R. Amrollahi

2010-10-01T23:59:59.000Z

460

TU KAISERSLAUTERN DEPARTMENT OF CHEMISTRY  

E-Print Network (OSTI)

TU KAISERSLAUTERN DEPARTMENT OF CHEMISTRY - STUDY GUIDE - H Rb Sr K Ca ...Mn Fe... ONC He P S Br Kr .................................................................................................22 FOOD CHEMISTRY AND TOXICOLOGY: JUN.-Prof. Dr. M. Esselen...............................................................................24 FOOD CHEMISTRY AND TOXICOLOGY: Prof. Dr. E. Richling

Madlener, Klaus

Note: This page contains sample records for the topic "uus kr xe" 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.


461

STUDIES OF ELECTRON CORRELATION IN THE PHOTOIONIZATION PROCESS  

E-Print Network (OSTI)

Kr. Another drawback of the electron source is that it needs1) to act as an electron source. ample room for improvement.UV lamp can be used as an electron source in electron impact

Roseberg, Richard Allen

2011-01-01T23:59:59.000Z

462

E-Print Network 3.0 - agenda abstracts index Sample Search Results  

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

Science and Engineering Pohang, Republic of Korea lcj80,hugman,gblee@postech.ac.kr Abstract... This work presents an agenda-based approach to improve the robustness of the...

463

Laser development for laser fusion applications. Research progress report, October 1978-September 1979  

SciTech Connect

During this report period, emphasis has been directed toward the advanced development of the HF, KrF, Se(/sup 1/S)-Se(/sup 3/P), and the chemically pumped iodine laser systems.

Not Available

1980-05-01T23:59:59.000Z

464

Energy Analysis of Convectively Induced Wind Perturbations  

Science Journals Connector (OSTI)

Budgets of divergent and rotational components of kinetic energy (KD and KR) are examined for four upper level wind speed maxima that develop during the fourth Atmospheric Variability Experiment (AVE IV) and the first AVE-Severe Environmental ...

Henry E. Fuelberg; Dennis E. Buechler

1989-04-01T23:59:59.000Z

465

National Infrastructure Protection Plan  

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

Infrastructure Infrastructure Protection Plan 2006 Preface Preface i The ability to protect the critical infrastructure and key resources (CI/KR) of the United States is vital to our national security, public health and safety, economic vitality, and way of life. U.S. policy focuses on the importance of enhancing CI/KR protection to ensure that essential governmental missions, public services, and economic functions are maintained in the event of a

466

Synthesis of Nano-scaled -Al2O3 Particles by Combustion Spray Byungsei Jun1,a  

E-Print Network (OSTI)

University, University Park, PA 16802, USA. a bsjun@Kyungnam.ac.kr, b SJLee@Kyungnam.ac.kr, c messing@ems solution was prepared by dissolving aluminium nitrate (Al(NO3)3·9H2O, 99%, Aldrich Chem. Co. Inc., USA) as an oxidizer and carbohydrazide (CH6N4O, 97%, Acros Organics, New Jersey, USA) as a fuel with the mo

Messing, Gary L.

467

T-Negative Issue 10  

E-Print Network (OSTI)

. "Easy, Kr. Sulu, until we're well away...': "Thirty-five kilometers, forty.. .fifty...'* Chekov recited. And then another voice interrupted him -- Kr. Leslie's, Jim tentatively identified it, Imagining him filling in at Spock's station. Permanently......" Leslie: "Ten meters and...it's gone!" There was a pause, and then Jim heard muffled cheers from the rest of the bridge crew. "Sensors register a kind of Imploslve force at the moment it disappeared ? but there was nothing there to Implode." "Like...

Multiple Contributors

1976-01-01T23:59:59.000Z

468

Chalmers University of Technology INFNGNING AV KOLDIOXID MED  

E-Print Network (OSTI)

Chalmers University of Technology INF�NGNING AV KOLDIOXID MED KEMCYKLISK F�RBR�NNING Chemical-Looping förbränning respiration ~2 000 000 000 f.Kr förbränning ~500 000 f.Kr. bränslecell 1839 chemical-looping Combustion (CLC) Anders Lyngfelt Chalmers Göteborg Chalmers Energidag 14 december 2012 #12;Chalmers

Lemurell, Stefan

469

2 Interaction Quanton-Matire Element of modern x-ray physics  

E-Print Network (OSTI)

-6 barn 4700 barn (Z=28, 1,5 �) Neutrons Particule ~ exp(i k.r) E2=p2c2+mn 2c4; E=p2/2mn (�)=0,286/E0.5(e barn Moments magnétiques d ~ 10-6 barn 4700 barn (Z=28, 1,5 �) Neutrons Particule ~ exp(i k.r) E2=p2c2

Paris-Sud 11, Université de

470

Atomistic Simulations of Mass and Thermal Transport in Oxide Nuclear Fuels  

SciTech Connect

In this talk we discuss simulations of the mass and thermal transport in oxide nuclear fuels. Redistribution of fission gases such as Xe is closely coupled to nuclear fuel performance. Most fission gases have low solubility in the fuel matrix, specifically the insolubility is most pronounced for large fission gas atoms such as Xe, and as a result there is a significant driving force for segregation of gas atoms to grain boundaries or dislocations and subsequently for nucleation of gas bubbles at these sinks. The first step of the fission gas redistribution is diffusion of individual gas atoms through the fuel matrix to existing sinks, which is governed by the activation energy for bulk diffusion. Fission gas bubbles are then formed by either separate nucleation events or by filling voids that were nucleated at a prior stage; in both cases their formation and latter growth is coupled to vacancy dynamics and thus linked to the production of vacancies via irradiation or thermal events. In order to better understand bulk Xe behavior (diffusion mechanisms) in UO{sub 2{+-}x} we first calculate the relevant activation energies using density functional theory (DFT) techniques. By analyzing a combination of Xe solution thermodynamics, migration barriers and the interaction of dissolved Xe atoms with U, we demonstrate that Xe diffusion predominantly occurs via a vacancy-mediated mechanism, though other alternatives may exist in high irradiation fields. Since Xe transport is closely related to diffusion of U vacancies, we have also studied the activation energy for this process. In order to explain the low value of 2.4 eV found for U migration from independent damage experiments (not thermal equilibrium) the presence of vacancy clusters must be included in the analysis. Next a continuum transport model for Xe and U is formulated based on the diffusion mechanisms established from DFT. After combining this model with descriptions of the interaction between Xe and grain boundaries derived from separate atomistic calculations, we simulate Xe redistribution for a few simple microstructures using finite element methods (FEM), as implemented in the MOOSE framework from Idaho National Laboratory. Thermal transport together with the power distribution determines the temperature distribution in the fuel rod and it is thus one of the most influential properties on nuclear fuel performance. The fuel thermal conductivity changes as function of time due to microstructure evolution (e.g. fission gas redistribution) and compositional changes. Using molecular dynamics simulations we have studied the impact of different types of grain boundaries and fission gas bubbles on UO{sub 2} thermal conductivity.

Andersson, Anders D. [Los Alamos National Laboratory; Uberuaga, Blas P. [Los Alamos National Laboratory; Du, Shiyu [Los Alamos National Laboratory; Liu, Xiang-Yang [Los Alamos National Laboratory; Nerikar, Pankaj [IBM; Stanek, Christopher R. [Los Alamos National Laboratory; Tonks, Michael [Idaho National Laboratory; Millet, Paul [Idaho National Laboratory; Biner, Bulent [Idaho National Laboratory

2012-06-04T23:59:59.000Z

471

In-situ gamma spectrometry measurements of time-dependent Xenon-135 inventory in the TRIGA Mark II reactor Vienna  

E-Print Network (OSTI)

In this work, it has been shown that the time dependent Xe-135 inventory in the TRIGA Mark II reactor in Vienna, Austria can be measured via gamma spectrometry even in the presence of strong background radiation. It is focussing on the measurement of (but not limited to) the nuclide Xe-135. The time dependent Xe-135 inventory of the TRIGA Mark II reactor Vienna has been measured using a temporary beam line between one fuel element of the core placed onto the thermal column after shutdown and a detector system located just above the water surface of the reactor tank. For the duration of one week, multiple gamma ray spectra were recorded automatically, starting each afternoon after reactor shutdown until the next morning. One measurement series has been recorded over the weekend. The Xe-135 peaks were extracted from a total of 1227 recorded spectra using an automated peak search algorithm and analyzed for their time-dependent properties. Although the background gamma radiation present in the core after shutdown was large especially in the lower energy range, the Xe-135 peak located at 249.8 keV could be extracted from the most spectra where present and could be compared to theoretical calculations.

Julia Riede; Helmuth Boeck

2013-07-29T23:59:59.000Z

472

Studies of a three-stage dark matter and neutrino observatory based on multi-ton combinations of liquid xenon and liquid argon detectors  

E-Print Network (OSTI)

We study a three stage dark matter and neutrino observatory based on multi-ton two-phase liquid Xe and Ar detectors with sufficiently low backgrounds to be sensitive to WIMP dark matter interaction cross sections down to 10E-47 cm^2, and to provide both identification and two independent measurements of the WIMP mass through the use of the two target elements in a 5:1 mass ratio, giving an expected similarity of event numbers. The same detection systems will also allow measurement of the pp solar neutrino spectrum, the neutrino flux and temperature from a Galactic supernova, and neutrinoless double beta decay of 136Xe to the lifetime level of 10E27 - 10E28 y corresponding to the Majorana mass predicted from current neutrino oscillation data. The proposed scheme would be operated in three stages G2, G3, G4, beginning with fiducial masses 1-ton Xe + 5-ton Ar (G2), progressing to 10-ton Xe + 50-ton Ar (G3) then, dependent on results and performance of the latter, expandable to 100-ton Xe + 500-ton Ar (G4). This ...

Arisaka, K; Smith, P F; Beltrame, P; Ghag, C; Lung, K; Teymourian, A; Wang, H; Cline, D B

2011-01-01T23:59:59.000Z

473

Surface damage on 6H–SiC by highly-charged Xeq+ ions irradiation  

Science Journals Connector (OSTI)

Abstract Surface damage on 6H–SiC irradiated by highly-charged Xeq+ (q = 18, 26) ions to different fluences in two geometries was studied by means of AFM, Raman scattering spectroscopy and FTIR spectrometry. The FTIR spectra analysis shows that for Xe26+ ions irradiation at normal incidence, a deep reflection dip appears at about 930 cm?1. Moreover, the reflectance on top of reststrahlen band decreases as the ion fluence increases, and the reflectance at tilted incidence is larger than that at normal incidence. The Raman scattering spectra reveal that for Xe26+ ions at normal incidence, surface reconstruction occurs and amorphous stoichiometric SiC and Si–Si and C–C bonds are generated and original Si–C vibrational mode disappears. And the intensity of scattering peaks decreases with increasing dose. The AFM measurement shows that the surface swells after irradiation. With increasing ion fluence, the step height between the irradiated and the unirradiated region increases for Xe18+ ions irradiation; while for Xe26+ ions irradiation, the step height first increases and then decreases with increasing ion fluence. Moreover, the step height at normal incidence is higher than that at tilted incidence by the irradiation with Xe18+ to the same ion fluence. A good agreement between the results from the three methods is found.

L.Q. Zhang; C.H. Zhang; L.H. Han; C.L. Xu; J.J. Li; Y.T. Yang; Y. Song; J. Gou; J.Y. Li; Y.Z. Ma

2014-01-01T23:59:59.000Z

474

CUG2011_Hopper2  

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

Cray User Group 2011 Proceedings 1 of 13 Cray User Group 2011 Proceedings 1 of 13 Transitioning Users from the Franklin XT4 System to the Hopper XE6 System Katie Antypas and Yun (Helen) He, National Energy Research Scientific Computing Center ABSTRACT: The Hopper XE6 system, NERSC's first peta-flop system with over 153,000 cores has increased the computing hours available to the Department of Energy's Office of Science users by more than a factor of 4. As NERSC users transition from the Franklin XT4 system with 4 cores per node to the Hopper XE6 system with 24 cores per node, they have had to adapt to a lower amount of memory per core and on- node I/O performance which does not scale up linearly with the number of cores per node. This paper will discuss Hopper's usage during the "early user period" and

475

ENVIRONMENTAL MEASUREMENTS OF RADIOXENON  

SciTech Connect

Radioactive xenon (radioxenon) is produced by the fissioning of nuclear material, either via neutron-induced or spontaneous fission, and also via neutron activation of xenon gas and other reactions. The most abundant xenon isotopes in the atmosphere are 131mXe, 133Xe and 135Xe, having been measured at several locations in the northern hemisphere associated with reactor operation, medical isotope production, and more recently associated with the spontaneous fission of 240Pu from the legacy materials at plutonium production facility in Hanford, Washington. Radioactive xenon measurement at levels near the average atmospheric level (1-10 mBq/m3) is a “specialty” measurement, requiring specialized collection, separation, and nuclear measurement techniques. This paper describes the political and scientific drivers for making radioxenon measurements, background sources, and current techniques for these measurements.

Bowyer, Ted W.; Hayes, James C.; McIntyre, Justin I.

2007-12-30T23:59:59.000Z

476

Radioxenon detections in the CTBT International Monitoring System likely related to the announced nuclear test in North Korea conducted on February 12, 2013  

SciTech Connect

Abstract: Observations of the radioxenon isotopes 133Xe and 131mXe collected at the IMS stations RN38 and RN58 on April 7-8, and April 12-13 2013, respectively, are unique with respect to the measurement history of these stations. Comparison of measured data with calculated isotopic ratios as well as analysis using atmospheric transport modeling indicate that it is likely that the xenon measured was created in the underground nuclear test conducted by North Korea on February 12, 2013, and released 7 weeks later. More than one release is required to explain all observations. The 131mXe source terms for each release were calculated to 7x1011 Bq, corresponding to about 1-10% of the total xenon inventory for a 10-kt explosion, depending on fractionation and release scenario. The observed ratios could not be used to obtain any information regarding the fissile material that was used in the test.

Ringbom, Anders; Axelssson, A.; Aldener, M.; Auer, M.; Bowyer, Ted W.; Fritioff, T.; Hoffman, Ian; Khrustalev, Kirill; Nikkinen, Mika; Popov, Vladimir Y.; Popov, Y.; Ungar, R. Kurt; Wotawa, G.

2014-02-01T23:59:59.000Z

477

NMR Detection Using Laser-Polarized Xenon as a DipolarSensor  

SciTech Connect

Hyperpolarized Xe-129 can be used as a sensor to indirectly detect NMR spectra of heteronuclei that are neither covalently bound nor necessarily in direct contact with the Xe atoms, but coupled through long-range intermolecular dipolar couplings. In order to reintroduce long-range dipolar couplings the sample symmetry has to be broken. This can be done either by an asymmetric sample arrangement, or by breaking the symmetry of the spin magnetization with field gradient pulses. Experiments are performed where only a small fraction of the available Xe-129 magnetization is used for each point, so that a single batch of xenon suffices for the point-by-point acquisition of a heteronuclear NMR spectrum. Examples with H-1 as analyte nucleus show that these methods have the potential to obtain spectra with a resolution that is high enough to determine homonuclear J couplings. The applicability of this technique with remote detection is discussed.

Granwehr, Josef; Urban, Jeffry T.; Trabesinger, Andreas H.; Pines, Alexander

2005-02-28T23:59:59.000Z

478

Ionization and equation of state of dense xenon at high pressures and high temperatures  

Science Journals Connector (OSTI)

The ionization degree and equation of state of dense xenon plasma were calculated by using self-consistent fluid variational theory for temperature of 4–30kK and density of 0.01–8.5g?cm3. The dense fluid xenon will be ionized at high pressures and temperatures. The ionization energy of xenon will be lowered due to the interactions among all particles of Xe, Xe+, Xe2+, and e. The ionization degree is obtained from nonideal ionization equilibrium, taking into account the correlative contributions to the chemical potential which is determined self-consistently by the free energy function. The composition of xenon has been calculated with given densities and temperatures in the region of partial ionization. The calculated results show a pressure softening regime at the onset of ionization. Comparison is performed with available shock-wave experiments and other theoretical calculations.

Q. F. Chen, L. C. Cai, Y. J. Gu, and Y. Gu

2009-01-22T23:59:59.000Z

479

Gene Expression Profiling of Peripheral Blood Mononuclear Cells from Cattle Infected with Mycobacterium paratuberculosis  

Science Journals Connector (OSTI)

...40416 BOTL0100002XB07R 1.748 0.850 0.30087 BOTL0100002XE08R 1.642 0.861 0.21130 BOTL0100002XE12R 1.743 1.205 0.46002 BOTL0100003XA08R 1.847 1.382 0.68034 BOTL0100003XB05R 2.243 1.737 0.79676 BOTL0100003XD05R 2.123 0.721 0.26725...

Paul M. Coussens; Christopher J. Colvin; Kacie Wiersma; Amy Abouzied; Sue Sipkovsky

2002-10-01T23:59:59.000Z

480

Effect of residual stress and surface roughness on the fatigue behaviour of aluminium matrix composites  

Science Journals Connector (OSTI)

In this investigation the fatigue properties of specimens manufactured with different turning parameters were investigated in stress-controlled constant amplitude tests at ambient temperature. The change of feed rate and depth of cut lead to a change in the near surface microstructure. Hence the fatigue properties were influenced significantly due to different surface roughness and surface residual stress resulting from the unequal turning processes. The cyclic deformation behaviour of AMC225xe is characterised by pronounced initial cyclic hardening. Continuous load increase tests allow a reliable estimation of the endurance limit of AMC225xe with one single specimen on the basis of cyclic deformation, temperature and electrical resistance data.

M Smaga; D Eifler

2010-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "uus kr xe" 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.


481

Prompt {gamma}-ray spectroscopy of isotopically identified fission fragments  

SciTech Connect

Measurements of prompt Doppler-corrected deexcitation {gamma} rays from uniquely identified fragments formed in fusion-fission reactions of the type {sup 12}C({sup 238}U,{sup 134}Xe)Ru are reported. The fragments were identified in both A and Z using the variable-mode, high-acceptance magnetic spectrometer VAMOS. States built on the characteristic neutron configurations forming high-spin isomers (7{sup -} and 10{sup +}) in {sup 134}Xe are presented and compared with the predictions of shell-model calculations using a new effective interaction in the region of Z{>=}50 and N{<=}82.

Shrivastava, A.; Caamano, M.; Rejmund, M.; Navin, A.; Rejmund, F.; Lemasson, A.; Schmitt, C.; Derkx, X.; Fernandez-Dominguez, B.; Golabek, C.; Roger, T. [GANIL, CEA/DSM--CNRS/IN2P3, Bd Henri Becquerel, BP 55027, F-14076 Caen Cedex 5 (France); Schmidt, K.-H. [GANIL, CEA/DSM-CNRS/IN2P3, Bd Henri Becquerel, BP 55027, F-14076 Caen Cedex 5 (France) and GSI-Helmholtzzentrum fuer Schwerionenforschung mbH, Planckstrasse 1, D-64220 Darmstadt (Germany); Gaudefroy, L.; Taieb, J. [CEA, DAM, DIF, F-91297 Arpajon (France); Sieja, K. [GSI-Helmholtzzentrum fuer Schwerionenforschung mbH, Planckstrasse 1, D-64220 Darmstadt (Germany); Institut fuer Kernphysik, Technische Universitaet Darmstadt, D-64289 Darmstadt (Germany); Audouin, L.; Bacri, C. O. [Institut de Physique Nucleaire, IN2P3-CNRS, Universite Paris Sud, F-91406 Orsay (France); Barreau, G.; Jurado, B. [Centre d'Etudes Nucleaires de Bordeaux Gradignan--UMR 5797, CNRS/IN2P3-Universite Bordeaux 1, F-33175 Gradignan Cedex (France); Benlliure, J. [Universidade de Santiago de Compostela, E-15782 Santiago de Compostela (Spain)] (and others)

2009-11-15T23:59:59.000Z

482

Detection of radioxenon in Darwin, Australia following the Fukushima Dai-ichi nuclear power plant accident  

Science Journals Connector (OSTI)

Abstract A series of 133Xe detections in April 2011 made at the Comprehensive Nuclear-Test-Ban Treaty Organisation (CTBTO) International Monitoring System noble gas station in Darwin, Australia, were analysed to determine the most likely source location. Forward and backwards atmospheric transport modelling simulations using FLEXPART were conducted. It was shown that the most likely source location was the Fukushima Dai-ichi nuclear power plant accident. Other potential sources in the southern hemisphere were analysed, including the Australian Nuclear Science and Technology Organisation (ANSTO) radiopharmaceutical facility, but it was shown that sources originating from these locations were highly unlikely to be the source of the observed 133Xe Darwin detections.

Blake Orr; Michael Schöppner; Rick Tinker; Wolfango Plastino

2013-01-01T23:59:59.000Z

483

A revised model of the kidney for medical internal radiation dose calculations  

E-Print Network (OSTI)

are frequently the organs receiving the highest level of radioactivity and, therefore, the largest radiation dose. Short lived radiopharmaceuticals, that are now injected in millicurie quantities in nuclear medicine for rapid-sequence imaging of the brain... radionuclides (Appendix B). 17 These include the following radionuclides presently used in nuclear medicine: P-32, Cr-51, Co-57, Ga-67, Tc-99m, In-ill, I-123, Xe-127, I-131, Xe-133, and T1-201. If the radionuclide emits penetrating radiation, the code...

Patel, Jyoti Shivabhai

1988-01-01T23:59:59.000Z

484

Room-Temperature Operation of DC Axially Discharged Fast Axial-Flow CO Laser  

Science Journals Connector (OSTI)

A compact CO laser with a DC axially discharged fast-axial flow has been operated at room temperature (270 – 300 K), achieving ~ 165 W per unit discharge length in CW mode under xenon (Xe) gas addition. A maximum power of 385 W per unit gain length (1 m) has been similarly achieved with Xe gas at 235 – 275 K. Dependence of output power on gas-flow velocity v , discharge current I dis, and gas composition is examined experimentally and theoretically explained, and dependence of oscillation lines on v is also investigated. Moreover, the effect of gas-flow velocity on gas temperature is also examined.

Yutaka Kodama; Heihachi Sato

1996-01-01T23:59:59.000Z

485

Momentum distributions of sequential ionization generated by an intense laser pulse  

E-Print Network (OSTI)

beam is produced in an EBIT (electron beam ion trap) that is kept at a potential of approximately 5 kV, and which can produce xenon ions with charges ranging from Xe1+ to around Xe20+. Selecting the desired initial charge state with a Wienfilter... that is on the order of its rest energy. Taking into account that the oscillation energy of a free electron is F 2/4?2, one can easily find that relativistic effects occur for radiation of the Ti:Sa laser at the intensity greater than 5? 1018 W/cm2 (see Ref. [2...

Shvetsov-Shilovski, N. I.; Sayler, A. M.; Rathje, T.; Paulus, Gerhard G.

2011-01-01T23:59:59.000Z

486

Linear Diagnostics to Assess the Performance of an Ensemble Forecast System  

E-Print Network (OSTI)

. The mathematical model we adopt to predict the evolution of uncertainty in a local state estimate (analysis or forecast), xe, is based on the assumption that the error in the state estimate, ? = xe ? xt, (2.1) *Portions of this chapter have been reprinted from... variable. In Equation (2.1) xt is the model representation of the, in practice unknown, true state of the atmosphere. The covariance between the different components of ? is described by the error covariance matrix P`. We employ a K-member ensemble...

Satterfield, Elizabeth A.

2011-10-21T23:59:59.000Z

487

States and Their Transitions The tuple  

E-Print Network (OSTI)

-Scholes formulas. ­ With the volatility set to a / 3 . ­ With the dividend yield set to qa (r + q + 2 /6)/2. · The formula is therefore C = Se-qa N(x) - Xe-r N(x - a ), (29) P = Xe-r N(-x + a ) - Se-qa N(-x), (29 ) ­ x ln(S/X)+(r-qa+2 a /2) a . c 2008 Prof. Yuh-Dauh Lyuu, National Taiwan University Page 332 #12;An

Lyuu, Yuh-Dauh

488

Cationic Ruthenium Hydrido?Carbonyls Derived from Metallocene-Based Pincers: Unusual Rearrangements and H2 Evolution with Formation of Cationic Ruthenium Metallocenylidenes  

Science Journals Connector (OSTI)

Calculations were performed using the PRIRODA program(20) and PBE functional(21) with 3z (includes functions for elements up to Xe) and sbk (includes functions for elements heavier than Xe up to radon) basis sets. ... This work was partly supported by the Russian Academy of Sciences, OX-01 Program of the Branch of Chemistry and Materials Sciences, the Russian Foundation for Basic Research (Project Nos. ... 10-03-00505, 08-03-01020), and the International Science and Technology Center (ISTC, Grant G 1361). ...

Avthandil A. Koridze; Alexander V. Polezhaev; Sergey V. Safronov; Alexey M. Sheloumov; Fedor M. Dolgushin; Mariam G. Ezernitskaya; Boris V. Lokshin; Pavel V. Petrovskii; Alexander S. Peregudov

2010-09-09T23:59:59.000Z

489

Phase Transition to an Opaque Plasma in a Sonoluminescing Bubble  

Science Journals Connector (OSTI)

Time-resolved spectrum measurements of a sonoluminescing Xe bubble reveal a transition from transparency to an opaque Planck blackbody. As the temperature is <10?000??K and the density is below liquid density, the photon scattering length is 10?000 times too large to explain its opacity. We resolve this issue with a model that reduces the ionization potential. According to this model, sonoluminescence originates in a new phase of matter with high ionization. Analysis of line emission from Xe* also yields evidence of phase segregation for this first-order transition inside a bubble.

Brian Kappus; Shahzad Khalid; Avik Chakravarty; Seth Putterman

2011-06-08T23:59:59.000Z

490

Robust upper limit on the neutron single-particle energy of the $i_{13/2}$ orbit  

E-Print Network (OSTI)

The boundary of the neutron $i_{13/2}$ single-particle energy is investigated with exact shell-model calculations, where random two-body interactions are adopted to overcome the bias from effective interactions. Excitation energies of $3^-_1$ state in $^{134}$Te and $^{136}$Xe, as well as those of $13/2^+_1$ states in $^{135}$Te and $^{137}$Xe, are taken as touchstones of our samplings. A robust upper limit of $\\varepsilon_{i13/2}mixing of $i_{13/2}$ single-neutron configuration and $f_{7/2}\\otimes 3^-$ configuration in $13/2^+_1$ states of $N=83$ isotones.

Y. Lei; H. Jiang

2013-12-19T23:59:59.000Z

491

National Infrastructure Protection Plan | Department of Energy  

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

Infrastructure Protection Plan Infrastructure Protection Plan National Infrastructure Protection Plan Protecting the critical infrastructure and key resources (CI/KR) of the United States is essential to the Nation's security, public health and safety, economic vitality, and way of life. Attacks on CI/KR could significantly disrupt the functioning of government and business alike and produce cascading effects far beyond the targeted sector and physical location of the incident. Direct terrorist attacks and natural, manmade, or technological hazards could produce catastrophic losses in terms of human casualties, property destruction, and economic effects, as well as profound damage to public morale and confidence. Attacks using components of the Nation's CI/KR as weapons of mass destruction could have even more

492

Experimental studies of electron impact depopulation of excited states of atoms: applications to laser development for fusion and isotope separation. Final report, 1 January 1977-30 June 1979  

SciTech Connect

Motivated by the need for measurements of metastable depopulation mechanisms of Ar and Kr in the KrF rare-gas monohalide excimer laser, an ultra-high vacuum triple crossed-beams apparatus has been designed, fabricated, and assembled for the purpose of studying electron scattering from excited states of Ar and Kr atoms. A beam of metastable rare gas atoms, produced by near-resonant charge transfer of rare gas ions with alkali neutral atoms, is crossed by an electron beam and a far-red laser beam along mutually orthogonal axes. A hemispherical electron monochromator-spectrometer pair is used to measure the cross section for electron scattering from the 2p/sub 9/ excited state of the rare gas atom. Testing of parts of the assembled apparatus has been completed.

Lubell, M.S.

1980-06-01T23:59:59.000Z

493

Calculation of large scale relative permeabilities from stochastic properties of the permeability field and fluid properties  

SciTech Connect

The paper describes the method and presents preliminary results for the calculation of homogenized relative permeabilities <Kr> using stochastic properties of the permeability field. In heterogeneous media, the spreading of an injected fluid is mainly sue to the permeability heterogeneity and viscosity fingering. At large scale, when the heterogeneous medium is replaced by a homogeneous one, we need to introduce a homogenized (or pseudo) relative permeability <Kr> to obtain the same spreading. Generally, <Kr> is derived by using fine-grid numerical simulations (Kyte and Berry). However, this operation is time consuming and cannot be performed for all the meshes of the reservoir. We propose an alternate method which uses the information given by the stochastic properties of the field without any numerical simulation. The method is based on recent developments on homogenized transport equations (the {open_quotes}MHD{close_quotes} equation, Lenormand SPE 30797). The MHD equation accounts for the three basic mechanisms of spreading of the injected fluid: (1) Dispersive spreading due to small scale randomness, characterized by a macrodispersion coefficient D. (2) Convective spreading due to large scale heterogeneities (layers) characterized by a heterogeneity factor H. (3) Viscous fingering characterized by an apparent viscosity ration M. In the paper, we first derive the parameters D and H as functions of variance and correlation length of the permeability field. The results are shown to be in good agreement with fine-grid simulations. The <Kr> are then derived a function of D, H and M. The main result is that this approach lead to a time dependent <Kr>. Finally, the calculated <Kr> are compared to the values derived by history matching using fine-grid numerical simulations.

Lenormand, R.; Thiele, M.R. [Institut Francais du Petrole, Rueil Malmaison (France)

1997-08-01T23:59:59.000Z

494

Energy Critical Infrastructure and Key Resources Sector-Specific  

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

Energy Energy Critical Infrastructure and Key Resources Sector-Specific Plan as input to the National Infrastructure Protection Plan (Redacted) May 2007 Department of Energy Energy Sector Government Coordinating Council Letter of Support i ii Energy Sector-Specific Plan (Redacted) Energy Sector Coordinating Councils Letter of Concurrence The National Infrastructure Protection Plan (NIPP) provides the unifying structure for the integration of federal critical infrastructures and key resources (CI/KR) protection efforts into a single national program. The NIPP includes an overall framework integrating federal programs and activities that are currently underway in the various sectors, as well as new and developing CI/KR protection efforts. The Energy

495

Momentum distributions in medium and heavy exotic nuclei  

E-Print Network (OSTI)

We study nucleon momentum distributions of even-even isotopes of Ni, Kr, and Sn in the framework of deformed self-consistent mean-field Skyrme HF+BCS method, as well as of theoretical correlation methods based on light-front dynamics and local density approximation. The isotopic sensitivities of the calculated neutron and proton momentum distributions are investigated together with the effects of pairing and nucleon-nucleon correlations. The role of deformation on the momentum distributions in even-even Kr isotopes is discussed. For comparison, the results for the momentum distribution in nuclear matter are also presented.

Gaidarov, M K; Sarriguren, P; Antonov, A N; Ivanov, M V; de Guerra, E Moya

2009-01-01T23:59:59.000Z

496

Alignment Delays in the N=Z Nuclei K72r, S76r, and Z80r  

Science Journals Connector (OSTI)

The ground state rotational bands of the N=Z nuclei 72Kr, 76Sr, and 80Zr have been extended into the angular momentum region where rotation alignment of particles is normally expected. By measuring the moments of inertia of these bands we have observed a consistent increase in the rotational frequency required to start pair breaking, when compared to neighboring nuclei. 72Kr shows the most marked effect. It has been widely suggested that these “delayed alignments” arise from np-pairing correlations. However, alignment frequencies are very sensitive to shape degrees of freedom and normal pairing, so the new experimental observations are still open to interpretation.

S. M. Fischer; C. J. Lister; D. P. Balamuth; R. Bauer; J. A. Becker; L. A. Bernstein; M. P. Carpenter; J. Durell; N. Fotiades; S. J. Freeman; P. E. Garrett; P. A. Hausladen; R. V. F. Janssens; D. Jenkins; M. Leddy; J. Ressler; J. Schwartz; D. Svelnys; D. G. Sarantites; D. Seweryniak; B. J. Varley; R. Wyss

2001-09-04T23:59:59.000Z

497

Conversion electrons used to monitor the energy scale of electron spectrometer near tritium endpoint - a simulation study  

E-Print Network (OSTI)

Measurements of the endpoint region of the tritium beta-decay spectrum provides good possibility to determine neutrino mass. This, however, needs a perfect monitoring of the spectrometer energy scale. A parallel measurement of electron line of known energy - in particular the 83mKr conversion K-line - may serve well to this purpose. The 83Rb decaying to 83mKr seems to be a very suitable radioactive source due to its halflife of 86.2 day. In this work, we determine the amount of 83Rb which is necessary for a successful monitoring.

M. Rysavy

2006-01-15T23:59:59.000Z

498

Xenon in Mercury-Manganese Stars  

E-Print Network (OSTI)

Previous studies of elemental abundances in Mercury-Manganese (HgMn) stars have occasionally reported the presence of lines of the ionized rare noble gas Xe II, especially in a few of the hottest stars with Teff ~ 13000--15000 K. A new study of this element has been undertaken using observations from Lick Observatory's Hamilton Echelle Spectrograph. In this work, the spectrum synthesis program UCLSYN has been used to undertake abundance analysis assuming LTE. We find that in the Smith & Dworetsky sample of HgMn stars, Xe is vastly over-abundant in 21 of 22 HgMn stars studied, by factors of 3.1--4.8 dex. There does not appear to be a significant correlation of Xe abundance with Teff. A comparison sample of normal late B stars shows no sign of Xe II lines that could be detected, consistent with the expected weakness of lines at normal abundance. The main reason for the previous lack of widespread detection in HgMn stars is probably due to the strongest lines being at longer wavelengths than the photographic blue. The lines used in this work were 4603.03A, 4844.33A and 5292.22A.

M. M. Dworetsky; J. L. Persaud; K. Patel

2008-01-16T23:59:59.000Z

499

E-Print Network 3.0 - ag dy ta Sample Search Results  

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

Tc 44 Ru 45 Rh 46 Pd 47 Ag 48 Cd 49 In 50 Sn 51 Sb 52 Te 53 I 54 Xe 55 Cs 56 Ba 57 La 72 Hf 73... Ta 74 W 75 Re 76 Os 77 Ir 78 Pt 79 Au 80 Hg 81 Tl 82 Pb 83 Bi 84 Po 85 At 86 Rn 87...

500

To link to this article : DOI:10.1016/j.anucene.2013.04.026 URL : http://dx.doi.org/10.1016/j.anucene.2013.04.026  

E-Print Network (OSTI)

as prediction of xe- non induced oscillations are an important part in the operation of a nuclear power plant and a 4DVAR scheme. Tests were made in twin experiments using a simulation code which implements a mono-dimensional coupled model of xenon dynamics, thermal, and thermal­hydraulic processes. We enlighten the very good

Mailhes, Corinne