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1

Direct measurement of {sup 12}C+{sup 4}He?{sup 16}O+? total cross section at E{sub cm}=1.2 MeV  

SciTech Connect (OSTI)

A fusion reaction of {sup 12}C+{sup 4}He?{sup 16}O+? is one of the main reactions in He-burning of stars and important for nucleosynthesis. The fusion cross section at stellar energy of E{sub cm}=0.3 MeV has not been determined precisely yet in spite of efforts for about 40 years. We plan to measure directly the total fusion cross section down to 0.7 MeV at Kyushu University Tandem accelerator Laboratory and to estimate the cross section at 0.3MeV by extrapolation. We have already measured the cross sections at 2.4 MeV and 1.5 MeV. The measurement at E{sub cm}=1.2 MeV is in progress.

Yamaguchi, H.; Sagara, K.; Fujita, K.; Kodama, D.; Narikiyo, Y.; Hamamoto, K.; Ban, T.; Tao, N.; Teranishi, T. [Department of Physics, Kyushu University (Japan)

2014-05-02T23:59:59.000Z

2

Nuclear level densities below 40 MeV excitation energy in the mass regionA ? 50  

Science Journals Connector (OSTI)

Consistent pre-equilibrium emission and statistical model calculations of fast neutron induced reaction cross sections are used to validate nuclear level densities for excitation energies up to 40 MeV in the mass...

M. Avrigeanu; M. Iva?cu; V. Avrigeanu

1990-01-01T23:59:59.000Z

3

Determination of Nuclear Level Densities at an Excitation Energy of 20 MeV  

Science Journals Connector (OSTI)

The level-density ratios in Fe56 and Ni60 at excitation energies of approximately 10 and 20 MeV have been evaluated by combining calculations based on the statistical theory of nuclear reactions and experimental measurements of level widths ? determined from studies of cross-section fluctuations. The importance of each of the various parameters in the statistical-theory calculation was studied as a function of the spin J of the compound nucleus. Assuming a Fermi-gas model with shell and pairing-energy corrections, the evaluated level-density ratios give values of the level density parameter a of 6.-0.9+0.6 and 6.7-1.3+0.8 MeV-1 for Fe56 and Ni60, respectively. These values of a are in excellent agreement with those made at excitation energies of less than 10 MeV. Hence, within the framework of the Fermi-gas model these results give independent evidence, in addition to the evidence already discussed in the literature, that the ? values determined from cross-section-fluctuation measurements are those characteristic of the compound nucleus.

H. K. Vonach and J. R. Huizenga

1965-06-21T23:59:59.000Z

4

CM-1-H Wholesale Power Rate Schedule | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

CM-1-H Wholesale Power Rate Schedule CM-1-H Wholesale Power Rate Schedule CM-1-H Wholesale Power Rate Schedule Area: MEAM, MDEA, and SMEPA System: CU This rate schedule shall be available to the South Mississippi Electric Power Association, Municipal Energy Agency of Mississippi, and Mississippi Delta Energy Agency. This rate schedule shall be applicable to electric capacity and energy available from the Dale Hollow, Center Hill, Wolf Creek, Cheatham, Old Hickory, Barkley, J. Percy Priest, and Cordell Hull Projects (all of such projects being hereinafter called collectively the "Cumberland Projects") and sold in wholesale quantities. Document Available for Download CM-1-H Rate Schedule More Documents & Publications CEK-1-H Wholesale Power Rate Schedule CSI-1-H Wholesale Power Rate Schedule

5

CM-1-H Wholesale Power Rate Schedule | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

CM-1-H Wholesale Power Rate Schedule CM-1-H Wholesale Power Rate Schedule CM-1-H Wholesale Power Rate Schedule Area: MEAM, MDEA, and SMEPA System: CU This rate schedule shall be available to the South Mississippi Electric Power Association, Municipal Energy Agency of Mississippi, and Mississippi Delta Energy Agency. This rate schedule shall be applicable to electric capacity and energy available from the Dale Hollow, Center Hill, Wolf Creek, Cheatham, Old Hickory, Barkley, J. Percy Priest, and Cordell Hull Projects (all of such projects being hereinafter called collectively the "Cumberland Projects") and sold in wholesale quantities. Document Available for Download CM-1-H Rate Schedule More Documents & Publications CEK-1-H Wholesale Power Rate Schedule CSI-1-H Wholesale Power Rate Schedule

6

On the Search for Nuclear Resonance Fluorescence Signatures of 235U and 238U above 3 MeV  

SciTech Connect (OSTI)

Nuclear resonance fluorescence is a physical process that provides an isotope-specific signature that could be used for the identification and characterization of materials. The technique involves the detection of prompt discrete-energy photons emitted from a sample that is exposed to MeV-energy photons. Potential applications of the technique range from detection of high explosives to characterization of special nuclear materials such as 235U. Pacific Northwest National Laboratory and Passport Systems have collaborated to conduct a pair of measurements to search for a nuclear resonance fluorescence response of 235U above 3 MeV and of 238U above 5 MeV using an 8 g sample of highly enriched uranium and a 90 g sample of depleted uranium. No new signatures were observed. The minimum detectable integrated cross section for 235U is presented.

Warren, Glen A.; Caggiano, Joseph A.; Bertozzi, William; Korbly, Steve; Ledoux, Robert; Park, William H.

2010-02-01T23:59:59.000Z

7

Final Report for Nuclear Resonance Fluorescence Measurements of 239Pu above 2.5 MeV  

SciTech Connect (OSTI)

Nuclear Resonance Fluorescence measurements were performed at the free electron laser facility at UC Santa Barbara using a bremsstrahlung beam. Three endpoint energies were chosen for the bremsstrahlung to cover as much area above 2.5 MeV as possible. We were able to set an upper limit of NRF state strengths between 2.5 and 3.8 MeV at roughly 38(5) eV barns at the 4-sigma level and 9(2) eV barns at the 1-sigma level. Published results on states near 2.4 MeV indicate strengths about 10(2) eV barns. Details of the results are presented in this report.

Johnson, M S; McNabb, D P

2009-01-07T23:59:59.000Z

8

CM-1-H Wholesale Power Rate Schedule | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

CM-1-H Wholesale Power Rate Schedule CM-1-H Wholesale Power Rate Schedule CM-1-H Wholesale Power Rate Schedule October 1, 2011 - 3:22pm Addthis Availability: This rate schedule shall be available to the South Mississippi Electric Power Association, Municipal Energy Agency of Mississippi, and Mississippi Delta Energy Agency (hereinafter called the Customers). Applicability: This rate schedule shall be applicable to electric capacity and energy available from the Dale Hollow, Center Hill, Wolf Creek, Cheatham, Old Hickory, Barkley, J. Percy Priest, and Cordell Hull Projects (all of such projects being hereinafter called collectively the "Cumberland Projects") and sold in wholesale quantities. Character of Service: The electric capacity and energy supplied hereunder will be three phase

9

Proton-induced cross-sections of nuclear reactions on lead up to 37 MeV  

E-Print Network [OSTI]

Excitation function of proton induced nuclear reactions on lead for production of $^{206,205,204,203,202,201g}$Bi, $^{203cum,202m,201cum}$Pb and $^{202cum,201cum,200cum,199cum}$Tl radionuclides were measured up to 36 MeV by using activation method, stacked foil irradiation technique and $\\gamma$-ray spectrometry. The new experimental data were compared with the few earlier experimental results and with the predictions of the EMPIRE3.1, ALICE-IPPE (MENDL2p) and TALYS (TENDL-2012) theoretical reaction codes.

F. Ditrói; F. Tárkányi; S. Takács; A. Hermanne

2014-11-07T23:59:59.000Z

10

Nuclear halo of a 177\\,MeV proton beam in water  

E-Print Network [OSTI]

The dose distribution of a pencil beam in a water tank consists of a core, a halo and an aura. The core consists of primary protons which suffer multiple Coulomb scattering (MCS) and slow down by multiple collisions with atomic electrons (Bethe-Bloch theory). The halo consists of charged secondaries, many of them protons, from elastic interactions with H, elastic and inelastic interactions with O, and nonelastic interactions with O. We show that the halo radius is roughly one third of the beam range. The aura consists of neutral secondaries (neutrons and gamma rays) and the charged particles they set in motion. We have measured the core/halo at 177 MeV using a test beam offset in a water tank. The beam monitor was a plane parallel ionization chamber (IC) and the field IC a dose calibrated Exradin T1. Our dose measurements are absolute. We took depth-dose scans at ten displacements from the beam axis ranging from 0 to 10 cm. The dose spans five orders of magnitude, and the transition from halo to aura is obvio...

Gottschalk, Bernard; Daartz, Juliane; Wagner, Miles S

2014-01-01T23:59:59.000Z

11

Nuclear sizes of Ca40,42,44,48 from elastic scattering of 104 MeV alpha particles. I. Experimental results and optical potentials  

Science Journals Connector (OSTI)

Differential cross sections for elastic scattering of 104 MeV ? particles from Ca40,42,44,48 have been measured with high angular accuracy over a wide angular range. Optical model analysis based on a Fourier-Bessel description of the real potential reveals isotopic differences which, in particular for Ca48, indicate a small neutron skin.NUCLEAR REACTIONS Ca40,42,44,48(?, ?), E?=104 MeV, measured ?(?); ?c.m.=3-110°; enriched targets; optical model analysis using Fourier-Bessel method, deduced isotopic differences in the real potentials.

H. J. Gils; E. Friedman; H. Rebel; J. Buschmann; S. Zagromski; H. Klewe-Nebenius; B. Neumann; R. Pesl; G. Bechtold

1980-04-01T23:59:59.000Z

12

Determination of the cross sections of (n,2n), (n,gamma) nuclear reactions on germanium isotopes at the energy of neutrons 13.96 MeV  

E-Print Network [OSTI]

The cross sections of 70Ge(n,2n)69Ge, 72Ge(n,2n)71Ge, 76Ge(n,gamma)77(g+0.21m)Ge, 76Ge(n,2n)75Ge nuclear reactions were measured at the energy of neutrons 13.96(6) MeV by activation method with gamma-ray and X-ray spectra studies.

S. V. Begun; O. G. Druzheruchenko; O. O. Pupirina; V. K. Tarakanov

2007-01-23T23:59:59.000Z

13

Activation cross-sections of long lived products of deuteron induced nuclear reactions on dysprosium up to 50 MeV  

E-Print Network [OSTI]

Activation cross-sections for production of 162m,161,155Ho,165,159,157,155Dy and 161,160,156,155Tb radionuclides in deuteron induced nuclear reactions on elemental dysprosium were measured up to 50 MeV for practical application and the test of the predictive power of nuclear reaction model codes. A stacked-foil irradiation technique and off-line gamma-ray spectrometry were used to determine the activities. No earlier cross-section data were found in the literature. The experimental data are compared with the predictions of the ALICE-D, EMPIRE-D and TALYS codes. Integral production yields were calculated from the fitted experimental data.

F. Tárkányi; F. Ditrói; S. Takács; J. Csikai; A. Hermanne; A. V. Ignatyuk

2014-02-05T23:59:59.000Z

14

Superfluorescence and amplified spontaneous emission of 29-cm-1 phonons in ruby  

Science Journals Connector (OSTI)

Superfluorescence and amplified spontaneous emission of 29-cm-1 phonons are observed following inversion of the E¯(2E)-2A¯(2E) acoustic transition of Cr3+ in ruby. The conditions for both of these manifestations of phonon avalanches are selected via the Cr3+ concentration. Superfluorescence is described in terms of a pendulum equation of the acoustic Bloch vector. Rate equations of the level and phonon populations account for amplified spontaneous emission.

M. H. F. Overwijk; J. I. Dijkhuis; H. W. de Wijn

1990-10-15T23:59:59.000Z

15

First Wideband Measurement (100-1400 cm-1) of the Atmospheric Emission Spectrum with an Uncooled FT Instrument (Including the Detector Unit) Operating at Stratospheric Balloon Altitude  

Science Journals Connector (OSTI)

In Earth radiation budget experiments, one missing measurement is the spectrally resolved OLR below 400cm-1. The first spectral measurement down to 100cm-1,...

Palchetti, Luca

16

Proton-Proton Scattering at 105 Mev and 75 Mev  

DOE R&D Accomplishments [OSTI]

The scattering of protons by protons provides an important method for studying the nature of nuclear forces. Recent proton-proton scattering experiments at energies as high as thirty Mev{sup 1} have failed to show any appreciable contribution to the cross section from higher angular momentum states, but it is necessary to bring in tensor forces to explain the magnitude of the observed cross section.

Birge, R. W.; Kruse, U. E.; Ramsey, N. F.

1951-01-31T23:59:59.000Z

17

Neutron spectroscopy of ice VIII in the region of 20–500 meV  

Science Journals Connector (OSTI)

Vibrational spectra of high-pressure phase ice VIII have been studied by inelastic neutron scattering over a wide energy transfer range, including external intermolecular and internal intramolecular modes up to 500 meV. It was clearly shown that the stretching intramolecular modes in ice VIII exhibit a narrow peak at an energy of 426 meV (or 3436 cm-1), which is higher than observed in all other known ice phases. The width of the peak (?20 meV or 161 cm-1) is much narrower than for other forms of ice (e.g., ?40 meV or 323 cm-1 for ice Ih), indicating a weak coupling between lattice and intramolecular stretching modes.

J-C. Li; C. Burnham; A. I. Kolesnikov; R. S. Eccleston

1999-04-01T23:59:59.000Z

18

Comparison of 3 MeV C{sup +} Ion-Irradiation Effects between The Nuclear Graphites made of Pitch and Petroleum Cokes  

SciTech Connect (OSTI)

Currently, all the commercially available nuclear graphite grades are being made from two different cokes, i.e., petroleum coke or coal-tar pitch coke, and a coal-tar pitch binder. Of these, since the coke composes most of the graphite volume, i.e., > 70 %, it is understood that a physical, chemical, thermal, and mechanical property as well as an irradiation-induced property change will be strongly dependent on the type of coke. To obtain first-hand information on the effects of the coke type, i.e., petroleum or pitch, on the irradiation sensitivity of graphite, specimens made of IG-110 of petroleum coke and IG-430 of pitch coke were irradiated up to {approx} 19 dpa by 3 MeV C{sup +} at room temperature, and the irradiation-induced changes in the hardness, Young's modulus, Raman spectrum, and oxidation properties were characterized. Results of the TEM show that the size and density of the Mrozowski cracks appeared to be far larger and higher in the IG-110 than the IG-430. Results of the hardness test revealed a slightly higher increase in the IG-430 than the IG-110 by around 10 dpa, and the Raman spectrum measurement showed a higher (FWHM){sub D}/(FWHM){sub G} value for IG-430 for 0.02 {approx} 0.25 dpa. Both the hardness and Raman measurement may imply a higher irradiation sensitivity of the IG-430 than the IG-110. Results of the Young's modulus measurements showed a large data scattering, which prevented us from estimating the differences between the grades. Oxidation experiments using a TG-DTA under a flow of dry air/He = 2.5 % (flow rate: 40 CC/min) at 750 and 1000 deg C show that the IG-110 of the petroleum coke exhibits a far higher oxidation rate than the IG-430. The discrepancy between the oxidation rate of the two grades increased with an increase in the oxidation temperature and the dose. Oxidized surface pore area was larger for IG-110. Judging from the results obtained from the present experimental conditions, the irradiation sensitivity appeared to be dependent on the degree of graphitization (thus, the perfection of graphite structure), and the differences in the oxidation property of the grades appeared to be largely affected by the structure of the Mrozowski cracks. Differences in the size and density of the Mrozowski cracks between the grades were attributed to the differences in the thermal conductivity of the grades. (authors)

Se-Hwan, Chi; Gen-Chan, Kim; Jong-Hwa, Chang [Nuclear Hydrogen Development and Demonstration Project, Korea Atomic Energy Research Institute, P.O. Box 105, Yuseong, Daejeon (Korea, Republic of)

2006-07-01T23:59:59.000Z

19

Tables and graphs of photon-interaction cross sections from 0. 1 keV to 100 MeV derived from the LLL evaluated-nuclear-data library  

SciTech Connect (OSTI)

Energy-dependent evaluated photon interaction cross sections and related parameters are presented for elements H through Cf(Z = 1 to 98). Data are given over the energy range from 0.1 keV to 100 MeV. The related parameters include form factors and average energy deposits per collision (with and without fluorescence). Fluorescence information is given for all atomic shells that can emit a photon with a kinetic energy of 0.1 keV or more. In addition, the following macroscopic properties are given: total mean free path and energy deposit per centimeter. This information is derived from the Livermore Evaluated-Nuclear-Data Library (ENDL) as of October 1978.

Plechaty, E.F.; Cullen, D.E.; Howerton, R.J.

1981-11-11T23:59:59.000Z

20

Neutron Total Cross Sections at 20 Mev  

Science Journals Connector (OSTI)

With the T(d, n)He4 reaction as a monoenergetic source of neutrons of about 20 Mev, the total cross sections of 13 elements have been measured by a transmission experiment. These cross sections vary approximately as A23 as is to be expected from the continuum theory of nuclear reactions. The cross section for hydrogen at 19.93 Mev is 0.504±0.01 barn. This result, together with other results at lower energies, seems to require a Yukawa potential in both the singlet and triplet n-p states and a singlet effective range that is lower than that obtained from p-p scattering data.

Robert B. Day and Richard L. Henkel

1953-10-15T23:59:59.000Z

Note: This page contains sample records for the topic "mev cm-1 nuclear" 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

Report to the DOE nuclear data committee. [EV RANGE 10-100; CROSS SECTIONS; PHOTONEUTRONS; NEUTRONS; GAMMA RADIATION; COUPLED CHANNEL THEORY; DIFFERENTIAL CROSS SECTIONS; MEV RANGE 01-10; ; CAPTURE; GAMMA SPECTRA; THERMAL NEUTRONS; COMPUTER CALCULATIONS; DECAY; FISSION PRODUCTS; FISSION YIELD; SHELL MODELS; NUCLEAR DATA COLLECTIONS  

SciTech Connect (OSTI)

Topics covered include: studies of (n, charged particle) reactions with 14 to 15 MeV neutrons; photoneutron cross sections for /sup 15/N; neutron radiative capture; Lane-model analysis of (p,p) and (n,n) scattering on the even tin isotopes; neutron scattering cross sections for /sup 181/Ta, /sup 197/Au, /sup 209/Bi, /sup 232/Th, and /sup 238/U inferred from proton scattering and charge exchange cross sections; neutron-induced fission cross sections of /sup 245/Cm and /sup 242/Am; fission neutron multiplicities for /sup 245/Cm and /sup 242/Am; the transport of 14 MeV neutrons through heavy materials 150 < A < 208; /sup 249/Cm energy levels from measurement of thermal neutron capture gamma rays; /sup 231/Th energy levels from neutron capture gamma ray and conversion electron spectroscopy; new measurements of conversion electron binding energies in berkelium and californium; nuclear level densities; relative importance of statistical vs. valence neutron capture in the mass-90 region; determination of properties of short-lived fission products; fission yield of /sup 87/Br and /sup 137/I from 15 nuclei ranging from /sup 232/Th to /sup 249/Cf; evaluation of charged particle data for the ECPL library; evaluation of secondary charged-particle energy and angular distributions for ENDL; and evaluated nuclear structure libraries derived from the table of isotopes. (GHT)

Struble, G.L.; Haight, R.C.

1981-03-01T23:59:59.000Z

22

Nuclear Structure and Nuclear Reactions | Argonne Leadership...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

value of 92.16 MeV and the point rms radius is 2.35 fm vs 2.33 from experiment. Nuclear Structure and Nuclear Reactions PI Name: James Vary PI Email: jvary@iastate.edu...

23

UK Oil and Gas Collaborative Doctoral Training Centre (2014 start) Project Title: Coupled flow of water and gas during hydraulic fracture in shale (EARTH-15-CM1)  

E-Print Network [OSTI]

of water and gas during hydraulic fracture in shale (EARTH-15-CM1) Host institution: University of Oxford in extracting gas from these low-permeability rocks is hydraulic fracture. This involves injecting large of water and gas during hydraulic fracturing and subsequent gas recovery. This is essential in order

Henderson, Gideon

24

J? assignment to the 4.841 MeV level in Pb208  

Science Journals Connector (OSTI)

A study of ? rays in coincidence with inelastically scattered ? particles shows the level at 4.841 ± 0.005 MeV in Pb208 to possess a large probability for decay to the ground state. The directional correlation of these ? rays require that this level have J?=1-.NUCLEAR REACTIONS Pb208(?,???), E?=35 MeV; deduced J? of 4.841 MeV level.

R. M. Del Vecchio; S. J. Freedman; G. T. Garvey; M. A. Oothoudt

1976-05-01T23:59:59.000Z

25

Elastic neutron scattering studies at 96 MeV for transmutation  

Science Journals Connector (OSTI)

......POSTER Presentations Elastic neutron scattering studies at 96 MeV for transmutation...University, Japan Elastic neutron scattering from 12C, 14N, 16O, 28Si...a nuclear target. Elastic neutron scattering is of utmost importance for......

M. Österlund; J. Blomgren; M. Hayashi; P. Mermod; L. Nilsson; S. Pomp; A. Öhrn; A. V. Prokofiev; U. Tippawan

2007-08-01T23:59:59.000Z

26

Proton-Proton Scattering at 5 Mev  

Science Journals Connector (OSTI)

The differential cross section for the scattering of protons by protons has been measured at an energy of 4.96±0.08 Mev, at angles from 12.5° to 55° in the laboratory system. The scattering medium was hydrogen gas at a pressure of approximately 5 cm of Hg. The scattered or recoil protons were detected by nuclear track photographic plates. Approximately 10,000 proton tracks were counted at each angle of observation. An estimate indicates the error of each individual cross section to be about two percent. Because the observations at each angle are made simultaneously, the relative accuracy from one angle to another is smaller and amounts to about 1.3 percent.

R. E. Meagher

1950-06-15T23:59:59.000Z

27

Single event upsets calculated from new ENDF/B-VI proton and neutron data up to 150 MeV  

SciTech Connect (OSTI)

Single-event upsets (SEU) in microelectronics are calculated from newly-developed silicon nuclear reaction recoil data that extend up to 150 MeV, for incident protons and neutrons. Calculated SEU cross sections are compared with measured data.

Chadwick, M.B. [Los Alamos National Lab., NM (United States). Theoretical Div.; Normand, E. [Boeing Military Aircraft and Missile Systems, Seattle, WA (United States)

1999-06-01T23:59:59.000Z

28

Delbrück contribution in the elastic scattering of 1.115-MeV photons  

Science Journals Connector (OSTI)

Differential cross sections for the elastic scattering of 1.115-MeV photons from tungsten (Z=74) and lead (Z=82) have been measured at angles ranging from 30° to 135°, using a high purity coaxial germanium detector. The experimental results are compared with S-matrix theoretical calculations of Rayleigh scattering cross sections, which also include contributions arising from the nuclear Thomson amplitudes and the Delbrück amplitude in lowest order Born approximation. The present experimental data at 1.115MeV indicates that Delbrück amplitudes calculated with lowest-order Born approximation, when combined with S-matrix Rayleigh scattering amplitudes, are sufficient, as has previously been observed at 1.332MeV for a number of high-Z elements, and at 1.121MeV and 1.173MeV for Z=92. This result for Z=74 and Z=82 at 1.115MeV provides further confirmation that the Delbrück amplitudes calculated with lowest-order Born approximation are sufficient for energies at and below 1.332MeV, in contrast to the situation at 2.754MeV where Coulomb corrections to the Delbrück amplitudes are significant for high-Z elements.

Bhakta Kunwar, Arunava Bhadra, Swapan K. Sen Gupta, J. P. J. Carney, and R. H. Pratt

2005-03-31T23:59:59.000Z

29

Fast neutron scattering on Gallium target at 14.8 MeV  

E-Print Network [OSTI]

Benchmarking of evaluated nuclear data libraries was performed for $\\sim 14.8$ MeV neutrons on Gallium targets. The experiments were performed at China Institute of Atomic Energy(CIAE). Solid samples of natural Gallium (3.2 cm and 6.4 cm thick) were bombarded by $\\sim 14.8$ MeV neutrons and leakage neutron energy spectra were measured at 60$^{\\circ}$ and 120$^{\\circ}$. The measured spectra are rather well reproduced by MCNP-4C simulations with the CENDL-3.1, ENDF/B-VII and JENDL-4.0 evaluated nuclear data libraries, except for the inelastic contributions around $E_{n} = 10-13$ MeV. All three libraries significantly underestimate the inelastic contributions. The inelastic contributions are further studied, using the Talys simulation code and the experimental spectra are reproduced reasonably well in the whole energy range by the Talys calculation, including the inelastic contributions.

Han, R; Chen, Z; Nie, Y; Liu, X; Zhang, S; Ren, P; Jia, B; Tian, G; Luo, F; Lin, W; Liu, J; Shi, F; Huang, M; Ruan, X; Ren, J; Zhou, Z; Huang, H; Bao, J; Zhang, K; Hu, B

2014-01-01T23:59:59.000Z

30

Fast neutron scattering on Gallium target at 14.8 MeV  

E-Print Network [OSTI]

Benchmarking of evaluated nuclear data libraries was performed for $\\sim 14.8$ MeV neutrons on Gallium targets. The experiments were performed at China Institute of Atomic Energy(CIAE). Solid samples of natural Gallium (3.2 cm and 6.4 cm thick) were bombarded by $\\sim 14.8$ MeV neutrons and leakage neutron energy spectra were measured at 60$^{\\circ}$ and 120$^{\\circ}$. The measured spectra are rather well reproduced by MCNP-4C simulations with the CENDL-3.1, ENDF/B-VII and JENDL-4.0 evaluated nuclear data libraries, except for the inelastic contributions around $E_{n} = 10-13$ MeV. All three libraries significantly underestimate the inelastic contributions. The inelastic contributions are further studied, using the Talys simulation code and the experimental spectra are reproduced reasonably well in the whole energy range by the Talys calculation, including the inelastic contributions.

R. Han; R. Wada; Z. Chen; Y. Nie; X. Liu; S. Zhang; P. Ren; B. Jia; G. Tian; F. Luo; W. Lin; J. Liu; F. Shi; M. Huang; X. Ruan; J. Ren; Z. Zhou; H. Huang; J. Bao; K. Zhang; B. Hu

2014-11-03T23:59:59.000Z

31

The influence of ion flux on defect production in MeV proton-irradiated silicon  

E-Print Network [OSTI]

The influence of ion flux on defect production in MeV proton-irradiated silicon A. Hall&, D. Fenyli, and B. U. R. Sundqvist Department of Radiation Sciences, Division of Ion Physics, P.O. Box 535, Uppsala University, S-751 21 UppsaIa, Sweden R. E. Johnson Department of Nuclear Engineering and Engineering Physics

Johnson, Robert E.

32

Polarized deuteron elastic scattering at 79 MeV and the effects of breakup channel coupling  

Science Journals Connector (OSTI)

We report angular distribution measurements of the cross section, the vector analyzing power (Ay), and two tensor analyzing powers [Ayy and X2=(2Axx+Ayy)3] for the elastic scattering of 79-MeV polarized deuterons from Ni58. These measurements are compared in detail with folding model calculations that include perturbative corrections for coupling to deuteron breakup channels.NUCLEAR REACTIONS Ni58(d?, d), Ed=79 MeV, measured elastic ?(?), and analyzing powers Ay(?), Ayy(?), and X2=[2Axx(?)+Ayy(?)]3; comparison with folding and breakup coupled-channel models.

E. J. Stephenson; J. C. Collins; C. C. Foster; D. L. Friesel; W. W. Jacobs; W. P. Jones; M. D. Kaitchuck; P. Schwandt; W. W. Daehnick

1983-07-01T23:59:59.000Z

33

Spin of the 14.174 MeV T=32 Level in F17  

Science Journals Connector (OSTI)

The T=32 level at 14.174 MeV in F17, which appears as a resonance at Ep=14.435 MeV in O16(p,p0)O16 has been assigned J?=32- on the basis of an analysis of O16(p?,p0)O16 measurements. This confirms the assignment of Skwiersky, Baglin, and Parker for this level, and disagrees with most shell-model calculations which predict a level of J?=12- near this energy.NUCLEAR STRUCTURE F17; Measured O16(p?,p0); deduced J? ?, ?po of F17 (T=32) level.

S. E. Darden and J. L. Foster

1979-06-01T23:59:59.000Z

34

Supersonic Free-jet Quantum Cascade Laser Measurements of v4 for CF3(35)Cl and CF3(37)Cl and FTS Measurements from 400 to 1260 cm-1  

SciTech Connect (OSTI)

A supersonic free-jet spectrum of the ?4 band of CF3Cl has been measured using a quantum cascade laser system. Those measurements were combined with a low temperature (-67 C) FTS spectrum of the region 1060 to 1260 cm-1 and with room temperature FTS measurements down to 400 cm-1 to give improved values for the rovibrational constants for the v1, v2, v3, 2v3, 2v5, v4, and v5 states of CF335Cl and CF337Cl. The principal perturbation found by earlier investigators in the v1 band is treated as a very weak Coriolis interaction at several avoided crossings of the rotational levels of the v1 state and the 2v5 state with kl < 0. None of the other vibrational states showed any signs of perturbations. With these new measurements we now have high resolution data on all of the fundamental vibrational states except v6.

Kelly, James F.; Maki, Arthur; Blake, Thomas A.; Sams, Robert L.

2008-11-01T23:59:59.000Z

35

Photodisintegration of the Deuteron at 20 Mev  

Science Journals Connector (OSTI)

Counter techniques have been applied to a study of the proton angular distribution in the photodisintegration of the deuteron induced by bremsstrahlung photons from a betatron in the energy interval 18-22 Mev. The measured distribution is given by A+sin2?(1+2?cos?), with A=0.132±0.041 and ??0.1. The total cross section is also measured.

J. Halpern and E. V. Weinstock

1953-08-15T23:59:59.000Z

36

Nuclear Radius and Nuclear Forces  

Science Journals Connector (OSTI)

The difference between the radius of the nuclear matter distribution and the nuclear force radius, RN?1.4A13×10-13 cm, for heavy nuclei (A>100) is interpreted as a consequence of the finite range of nuclear forces. Assuming that the nuclear matter distribution coincides with the charge distribution as determined at Stanford (RC=1.12A13×10-13 cm is the distance at which the charge density falls to one half value) we sum up the nuclear interactions of an incident nucleon for various proposed internucleon potentials, V(r). We also evaluate contributions from the spin, charge, and matter polarizations induced in the nuclear distributions by the incident nucleon as a test of the convergence of these calculations. The aim here is to infer some features of nuclear forces which satisfy saturation requirements and at the same time give rise to an appreciable nuclear attraction for an incident nucleon at RN. Analyses of the scattering of neutrons and protons by heavy nuclei suggest a nuclear attraction ?14 Mev at a distance RN.These considerations are primarily sensitive to the long range behavior of the direct, central part of V(r). The key point which emerges from them is that the nuclear forces must contain long range (~ meson Compton wavelength) direct, central attractions which will be felt by an incident nucleon at RN before the shorter range repulsions (hard cores, many-body forces, or exchange interactions), which are responsible for saturation, become effective. Such interactions can be constructed phenomenologically, but are not found in recent meson-theoretically deduced potentials.

S. D. Drell

1955-10-01T23:59:59.000Z

37

Cross Sections from 800 MeV Proton Irradiation of Terbium  

E-Print Network [OSTI]

A single terbium foil was irradiated with 800 MeV protons to ascertain the potential for production of lanthanide isotopes of interest in medical, astrophysical, and basic science research and to contribute to nuclear data repositories. Isotopes produced in the foil were quantified by gamma spectroscopy. Cross sections for 36 isotopes produced in the irradiation are reported and compared with predictions by the MCNP6 transport code using the CEM03.03, Bertini, and INCL+ABLA event generators. Our results indicate the need to accurately consider fission and fragmentation of relatively light target nuclei like terbium in the modeling of nuclear reactions at 800 MeV. The predictive power of the code was found to be different for each event generator tested but was satisfactory for most of the product yields in the mass region where spallation reactions dominate. However, none of the event generators' results are in complete agreement with measured data.

J. W. Engle; S. G. Mashnik; H. Bach; A. Couture; K. Jackman; R. Gritzo; B. D. Ballard; M. Faßbender; D. M. Smith; L. J. Bitteker; J. L. Ullmann; M. Gulley; C. Pillai; K. D. John; E. R. Birnbaum; F. M. Nortier

2012-07-05T23:59:59.000Z

38

Nuclear Forces  

Science Journals Connector (OSTI)

One-meson-exchange Feynman diagrams are nonrelativistically reduced and unitarized via Schrödinger's equation. Properties of nucleon-nucleon scattering are calculated at incident laboratory energies of 25-310 MeV. Bound-state properties of the deuteron and of nuclear matter are also calculated. Mesons included are the ?, ?, ?, ?, ?, and ?. Very good over-all agreement with the experimental data is obtained. Important features of this "potential" include its momentum dependence, properly treated, and the contribution of the ? "meson," which qualitatively changes the central/tensor force ratio from that of previous phenomenological potentials.

Lester Ingber

1968-10-20T23:59:59.000Z

39

Nuclear Forces and Nuclear Energetics  

Science Journals Connector (OSTI)

Both a static and a momentum-dependent potential are derived from one-meson-exchange Born amplitudes, and are adjusted to fit (i) the deuteron binding energy and quadrupole moment, (ii) S, P, and D partial waves from 25 to 310 MeV, and (iii) the binding energy and saturation property of nuclear matter. This is possible through a different form of the central and tensor potentials which has not been used previously to calculate problems (i), (ii), and (iii) above. We find the ? meson unsuitable to describe the two-pion-exchange region in that a potential with meson parameters common to all partial waves is not achieved.

Lester Ingber

1970-01-01T23:59:59.000Z

40

Soft nuclear equations of state for super-massive neutron star  

E-Print Network [OSTI]

Soft nuclear equations of state for super-massive neutron star K. Miyazaki E-mail: miyazakiro@rio.odn.ne.jp Abstract Two new nuclear equations of state (EOSs) are proposed and are applied to neutron star (NS). They predict the incompressibilities K0 = 179MeV and 230MeV, respectively. The density dependencies of nuclear

Note: This page contains sample records for the topic "mev cm-1 nuclear" 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

Nuclear structure effects in light muonic atoms  

E-Print Network [OSTI]

Nuclear structure corrections to energy levels of light muonic atoms are derived with particular attention to the correct nuclear mass dependence. The obtained result for the 2P-2S transition of 1.717(19) meV serves for determination of the nuclear charge radius from the spectroscopic measurement in muonic deuterium.

Pachucki, Krzysztof

2015-01-01T23:59:59.000Z

42

Elastic Scattering of Protons at 31.5, 20, and 14.5 Mev  

Science Journals Connector (OSTI)

A survey of the differential cross sections for the elastic scattering of protons has been made for protons of 31.5, 20, and 14.5 Mev. The angular distribution shows well-developed maxima and minima only for nuclei of intermediate atomic weight. For heavy nuclei, the diffraction effect is destroyed by the Coulomb scattering. With 31.5-Mev protons, the first minimum disappears for nuclei heavier than Zr; with 20-Mev protons, for nuclei heavier than V. In light nuclei, the maxima and minima are progressively obliterated as the mass number is reduced and the energy is increased. In the main, the angular distribution changes smoothly from one nucleus to another, the cross sections at the maxima increasing as the fourth power of the nuclear radius. However, these cross sections are not proportional to the energy, as would be expected from elementary diffraction theory. For intermediate nuclei, these cross sections are nearly independent of the energy; for nuclei from O to Mg they rise to a maximum near 20 Mev, and for light nuclei, they fluctuate in a less regular manner.

B. B. Kinsey and T. Stone

1956-08-15T23:59:59.000Z

43

Nuclear symmetry energy  

Science Journals Connector (OSTI)

To study the nuclear symmetry energy, we extend the Dirac-Brueckner approach with a Bonn one-boson-exchange nucleon-nucleon interaction to the general case of asymmetric nuclear matter. We extract the symmetry energy coefficient at the saturation to be about 31 MeV, which is in good agreement with the empirical value of 30±4 MeV. The symmetry energy is found to increase almost linearly with the density, which differs considerably from the results of nonrelativistic approaches. This finding also supports the linear parametrization of Prakash, Ainsworth, and Lattimer. We find, furthermore, that the higher-order dependence of the nuclear equation of state on the asymmetry parameter is unimportant.

C.-H. Lee; T. T. S. Kuo; G. Q. Li; G. E. Brown

1998-06-01T23:59:59.000Z

44

Nuclear Waffles  

E-Print Network [OSTI]

The dense neutron-rich matter found in supernovae and neutron stars is expected to form complex nonuniform phases referred to as nuclear pasta. The pasta shapes depend on density, temperature and proton fraction and determine many transport properties in supernovae and neutron star crusts. We use two recently developed hybrid CPU/GPU codes to perform large scale molecular dynamics (MD) simulations with $51200$ and $409600$ nucleons of nuclear pasta. From the output of the MD simulations we characterize the topology and compute two observables, the radial distribution function $g(r)$ and the structure factor $S(q)$, for systems with proton fractions $Y_p=0.10, 0.20, 0.30$ and $0.40$ at about one third of nuclear saturation density and temperatures near $1.0$ MeV. We observe that the two lowest proton fraction systems simulated, $Y_p=0.10$ and $0.20$, equilibrate quickly and form liquid-like structures. Meanwhile, the two higher proton fraction systems, $Y_p=0.30$ and $0.40$, take a longer time to equilibrate and organize themselves in solid-like periodic structures. Furthermore, the $Y_p=0.40$ system is made up of slabs, lasagna phase, interconnected by defects while the $Y_p=0.30$ systems consist of a stack of perforated plates, the nuclear waffle phase. The periodic configurations observed in our MD simulations for proton fractions $Y_p\\ge0.30$ have important consequences for the structure factors $S(q)$ of protons and neutrons, which relate to many transport properties of supernovae and neutron star crust. A detailed study of the waffle phase and how its structure depends on temperature, size of the simulation and the screening length showed that finite-size effects appear to be under control and, also, that the plates in the waffle phase merge at temperatures slightly above $1.0$ MeV and the holes in the plates form an hexagonal lattice at temperatures slightly lower than $1.0$ MeV.

A. S. Schneider; D. K. Berry; C. M. Briggs; M. E. Caplan; C. J. Horowitz

2014-09-08T23:59:59.000Z

45

Elastic Scattering of 20.6-Mev Protons by Deuterons  

Science Journals Connector (OSTI)

The absolute differential cross section for the elastic scattering of 20.6-Mev protons by deuterons was measured by using the external beam of the U.C.L.A. synchrocyclotron. A triplecoincidence proportional counter telescope, with variable absorbers between the second and third counters and differential pulseheight discriminators (set by a new method) on the first two counters, was used to select the desired particle by range and specific ionization. Deuterium gas at atmospheric pressure provided the target for the proton beam, which was collimated to 18 in. diameter, with a maximum angular divergence of ½°. An interchangeable slit system gave angular resolutions of 0.9° or 1.8°. Absolute measurements were made at 22 angles from 12° to 164° (center-of-mass) with an accuracy varying approximately from 1 percent to 3 percent, depending upon the angle. The cross section shows the familiar deep minimum (near 130° in the present case), but in addition a shallower minimum near 18°, due to Coulomb-nuclear interference. This latter minimum should allow fitting the data with a unique set of phase shifts, unlike previous nucleon-deuteron scattering experiments, and thus provide a more stringent test for theories.

David O. Caldwell and J. Reginald Richardson

1955-04-01T23:59:59.000Z

46

95 MeV neutron scattering on hydrogen, deuterium, carbon, and oxygen  

Science Journals Connector (OSTI)

Three neutron-deuteron scattering experiments at 95 MeV have been performed recently at The Svedberg Laboratory in Uppsala. Subsets of the results of these experiments have been reported in two short articles, showing clear evidence for three-nucleon force effects. In this paper, we present a more detailed description of the experimental methods as well as further discussion of the results. In addition to neutron-deuteron scattering data, neutron-proton and C12(n,n) elastic scattering data have been measured for normalization purposes, and O16(n,n) data have been obtained for the first time at this energy. It was possible to extract C12(n,n') and O16(n,n') inelastic scattering cross sections to excited states below 12 MeV excitation energy. The inelastic scattering data (for both carbon and oxygen) are shown to have a significant impact on the determination of nuclear recoil kerma coefficients.

P. Mermod; J. Blomgren; C. Johansson; A. Öhrn; M. Österlund; S. Pomp; B. Bergenwall; J. Klug; L. Nilsson; N. Olsson; U. Tippawan; P. Nadel-Turonski; O. Jonsson; A. Prokofiev; P.-U. Renberg; Y. Maeda; H. Sakai; A. Tamii; K. Amos; R. Crespo; A. Moro

2006-11-27T23:59:59.000Z

47

Proton Angular Distribution for 90 Mev Neutron-proton Scattering  

E-Print Network [OSTI]

recoil protons in neutron -proton scattering at 90 Mev hasFOR 90 lWEV NEUTRON-PROTON SCATTERING James Hadley, Cecil E.

Hadley, James

2010-01-01T23:59:59.000Z

48

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

49

MeV and all that  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Units in Particle Physics or: "What GeVs?" Units in Particle Physics or: "What GeVs?" Conservation Laws - Data Analysis Using Graphs - Histograms - Units or Vectors in Particle Physics Read a little about particle physics, and soon you'll see some units that aren't quite MKS . . . or cgs either. These odd units are all based on the electron-volt (eV) which itself comes from the simple insight that a single electron accelerated by a potential difference of 1 volt will have a discreet amount of energy, 1 eV = (1.609 x 10-19 C)(1 J/C) = 1.609 x 10-19 J. Take a look: To make matters more complicated, we can make multiples of 1 eV: 1 keV = 103 eV 1 MeV = 106 eV 1 GeV = 109 eV and 1 TeV = 1012 eV (hence the Tevatron) It gets better, though. Energy units have dimensions of (mass)(length)2/(time)2. Divide that by the dimensions of velocity,

50

Proton-Proton Scattering at 5 Mev  

Science Journals Connector (OSTI)

A scattering chamber has been constructed which employs a number of radial slit units arranged at various angles with respect to the collimated beam of protons. A photographic plate is placed behind each slit unit and the tracks of protons which are scattered into the plate can be counted. To obtain cross sections from this apparatus the number of tracks per unit area must be determined. Protons were scattered from hydrogen gas at approximately 1.5-cm Hg pressure. Advantages of the design were relatively simple geometry, data obtained simultaneously at all angles, almost complete freedom from impurity-scattering, and short cyclotron running times. The differential cross sections were measured for 5.07-Mev protons from 14° to 150° in the center-of-mass system. The results indicate an S-wave phase shift of 54.5±0.6° and a repulsive P-wave phase shift of 0.05±0.09°. They are therefore quite consistent with pure S-wave scattering.

K. B. Mather

1951-04-15T23:59:59.000Z

51

Overview of Antikaon-Nuclear Theory and Phenomenology  

E-Print Network [OSTI]

Experimental evidence for antikaon-nuclear quasibound states is briefly reviewed. Theoretical and phenomenological arguments for and against deep antikaon-nucleus potentials which might allow for narrow quasibound states are reviewed, with recent calculations suggesting widths larger than 100 MeV for binding energy smaller than 100 MeV. Results of RMF calculations that provide a lower limit of 50+/-10 MeV for the width of deeply bound states are discussed.

Avraham Gal

2007-03-29T23:59:59.000Z

52

Nuclear incompressibility determined by nuclear mass and monopole resonance energy  

Science Journals Connector (OSTI)

The standard nuclear matter incompressibility K0 is determined by a data fit based on a model of nuclear energy functional and the scaling assumption of the nuclear breathing mode. The selected nuclear data used in this fit are taken from a limited set of nuclei which have both the measured mass M and the isoscalar giant monopole resonance energy EM. The obtained value of K0, based on 26 experimental points corresponding to 18 spherical nuclei with 89<~A<~209, is 220±20 MeV.

K. C. Chung; C. S. Wang; A. J. Santiago

1999-02-01T23:59:59.000Z

53

Nuclear Energy  

Science Journals Connector (OSTI)

Nuclear Energy ... A brief summary of the history and key concepts of nuclear energy. ... Nuclear / Radiochemistry ...

Charles D. Mickey

1980-01-01T23:59:59.000Z

54

Nuclear batteries  

Science Journals Connector (OSTI)

Nuclear batteries ... Describes the structure, operation, and application of nuclear batteries. ... Nuclear / Radiochemistry ...

Alfred B. Garrett

1956-01-01T23:59:59.000Z

55

Structure in the energy dependence of the proton total reaction cross section for C and Si in the energy region 20-40 MeV  

Science Journals Connector (OSTI)

Measurements of proton total reaction cross sections for Be9, C12, O16, and Si28 have been made in the energy range between 20-44 MeV. The cross sections show irregular energy variation for C12 at about 23.8 and 25.9 MeV, and for Si28 at 30.3 and 33.5 MeV; irregularities were not observed clearly for Be9 or O16.NUCLEAR REACTIONS Be9, C12, O16, Si28: 20 MeVMeV, between 23 and 51 measurements for each nucleus; measured ?R; natural targets, except for O16 gas and SiO2 used for O16 measurements.

I. Šlaus; D. J. Margaziotis; R. F. Carlson; W. T. H. van Oers; J. Reginald Richardson

1975-09-01T23:59:59.000Z

56

Nuclear Forensics  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

nuclear forensics Nuclear Forensics AMS is a Powerful Tool for Nuclear Forensics Nuclear forensics, which can be applied to both interdicted materials and debris from a nuclear...

57

Calculation and evaluation of cross-sections for p+184W reactions up to 200MeV  

E-Print Network [OSTI]

The cross-sections of proton-induced reactions on 184W at incident proton energy below 200MeV are calculated and analyzed including reaction cross-sections, elastic scattering angular distributions, energy spectra and double differential cross section. Nuclear theoretical models which integrate the optical model, distorted born wave approximation theory, the intra-nuclear cascade model, the exciton model, the Hauser-Feshbach theory and the evaporation model are used in the reactions. Theoretical results are compared with the existent experimental data.

Sun, Jianping; Han, Yinlu

2015-01-01T23:59:59.000Z

58

Giant Resonances Observed in Scattering of 96-Mev and 115-Mev Alpha-Particles  

E-Print Network [OSTI]

, and the GQR peaks after background subtraction. 13 GIANT RE SONAN C ES OBS E RVE D IN TH E S CATT E RING 0 F. . . 999 O lP (a) JD E LLI l.o? 0 b OJ k kk k I I Zr(a, a') Zr Ea=6 Mev BG/MeV kk kk kk kk kkkk k k k k O. I' Ilp I I 20 50 ec... shell nuclei ' Ca, Zr, ' 'Sm, and 'Pb. A small but significant broadening is observed in the rare-earth region of deformed nuclei. The giant dipole resonance is not appreciably excited for any of the targets. NU CLEAR R EACTIONS N, 0 Ne, A]. 28Sj, 82S...

Youngblood, David H.; Moss, JM; Rozsa, C. M.; Bronson, J. D.; Bacher, A. D.; Brown, D. R.

1976-01-01T23:59:59.000Z

59

Proton-production double-differential cross sections for 300-MeV and 392-MeV proton-induced reactions  

SciTech Connect (OSTI)

We investigate proton-production double-differential cross sections (DDXs) for 300- and 392-MeV proton-induced reactions on O, V, Tb, Ta, Au, Pb, and Bi. Emitted proton energies are measured with stacked scintillator spectrometers by the {Delta}E-E technique. Experimental results are compared with the intranuclear cascade (INC) and quantum molecular dynamics models. Although both models can reproduce spectral DDXs, there is a difference at the most forward and backward angles. The cause of these differences is discussed in terms of the refraction caused by the nuclear potential. Angular distributions of the present data are well accounted for by the Kalbach systematics plus INC one-step calculations. The quasi-free-scattering contribution increases with decreasing target mass and increasing emission energy.

Iwamoto, Hiroki [Department of Applied Quantum Physics and Nuclear Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395 (Japan); Japan Atomic Energy Agency, Tokai-mura, Naka-gun, Ibaraki 319-1195 (Japan); Imamura, Minoru; Koba, Yusuke; Fukui, Yoshinori; Wakabayashi, Genichiro; Uozumi, Yusuke [Department of Applied Quantum Physics and Nuclear Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395 (Japan); Kin, Tadahiro; Iwamoto, Yosuke [Japan Atomic Energy Agency, Tokai-mura, Naka-gun, Ibaraki 319-1195 (Japan); Hohara, Shinya [Kinki University Atomic Energy Research Institute, Kowakae, Higashiosaka 577-8502 (Japan); Nakano, Masahiro [University of Occupational and Environmental Health, Kitakyushu 807-8555 (Japan)

2010-09-15T23:59:59.000Z

60

Development of mass spectrometry by high energy focused heavy ion beam: MeV SIMS with 8 MeV Cl7+ beam  

Science Journals Connector (OSTI)

Abstract Particle induced X-ray emission (PIXE) at microprobe of Jožef Stefan Institute is used to measure two-dimensional quantitative elemental maps of biological tissue. To improve chemical and biological understanding of the processes in vivo, supplementary information about chemical bonding and/or molecular distributions could be obtained by heavy-ion induced molecular desorption and a corresponding mass spectroscopy with Time-Of-Flight (TOF) mass spectrometer. As the method combines the use of heavy focused ions in MeV energy range and TOF Secondary Ion Mass Spectrometry, it is denoted as MeV SIMS. At Jožef Stefan Institute, we constructed a linear TOF spectrometer and mount it to our multipurpose nuclear microprobe. A beam of 8 MeV 35Cl7+ could be focused to a diameter of better than 3 ?m × 3 ?m and pulsed by electrostatic deflection at the high-energy side of accelerator. TOF mass spectrometer incorporates an 1 m long drift tube and a double stack microchannel plate (MCP) as a stop detector positioned at the end of the drift path. Secondary ions are focused at MCP using electrostatic cylindrical einzel lens. Time of flight spectra are currently acquired with a single-hit time-to-digital converter. Pulsed ion beam produces a shower of secondary ions that are ejected from positively biased target and accelerated towards MCP. We start our time measurement simultaneously with the start of the beam pulse. Signal of the first ion hitting MCP is used to stop the time measurement. Standard pulses proportional to the time of flight are produced with time to analog converter (TAC) and fed into analog-to-digital converter to obtain a time histogram. To enable efficient detection of desorbed fragments with higher molecular masses, which are of particular interest, we recently implemented a state-of art Field Programmable Gate Array (FPGA)-based multi-hit TOF acquisition. To test the system we used focused 8 MeV 35Cl7+ ion beam with pulse length of 180 ns. Mass resolution of measured SIMS spectra, dominantly determined by the duration of the beam pulse, is in good agreement with resolution estimated from pulse length. With improved high-voltage switching ability that will enable beam pulses with duration of 50 ns, a mass resolution of better than 500 is anticipated.

Luka Jeromel; Zdravko Siketi?; Nina Ogrinc Poto?nik; Primož Vavpeti?; Zdravko Rupnik; Klemen Bu?ar; Primož Pelicon

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "mev cm-1 nuclear" 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

Nuclear Compressibility and Symmetry Energy  

Science Journals Connector (OSTI)

A modification and generalization of the Puff-Martin model for many-fermion systems is employed to calculate nuclear compressibility and symmetry energy in order to provide a practical test of the model and at the same time obtain useful information about these interesting quantities. An alternative, heuristic, derivation of the Puff-Martin equations is presented in order to exhibit the role of the exclusion principle. The condition stated for normal nuclear matter is that the mean binding energy be minimal (with respect to variation of the Fermi momentum) rather than the Puff-Martin condition that the mean binding energy equal the "single particle" energy at the Fermi surface. These two quantities differ from each other by the rearrangement energy, which is found to be 10 Mev. Employing Puff's potential (hard-shell potential plus a separable Yamaguchi potential, acting only in relative S states), satisfactory agreement is obtained with observed binding energy and density. The value of nuclear compressibility, 214 Mev, falls within the wide range of semiempirical values. The symmetry energy coefficient, 43 Mev, is larger, by 40-80%, than those usually quoted in semiempirical mass formulas. However, our value of the symmetry coefficient is the same as that calculated by Brueckner and Gammel in the absence of odd-state forces; they found the coefficient to be reduced to 26 Mev when a more realistic potential, including odd-state contributions, is employed.

David S. Falk and Lawrence Wilets

1961-12-15T23:59:59.000Z

62

Nuclear photonics  

SciTech Connect (OSTI)

With the planned new {gamma}-beam facilities like MEGa-ray at LLNL (USA) or ELI-NP at Bucharest (Romania) with 10{sup 13}{gamma}/s and a band width of {Delta}E{gamma}/E{gamma} Almost-Equal-To 10{sup -3}, a new era of {gamma} beams with energies up to 20MeV comes into operation, compared to the present world-leading HI{gamma}S facility at Duke University (USA) with 10{sup 8}{gamma}/s and {Delta}E{gamma}/E{gamma} Almost-Equal-To 3 Dot-Operator 10{sup -2}. In the long run even a seeded quantum FEL for {gamma} beams may become possible, with much higher brilliance and spectral flux. At the same time new exciting possibilities open up for focused {gamma} beams. Here we describe a new experiment at the {gamma} beam of the ILL reactor (Grenoble, France), where we observed for the first time that the index of refraction for {gamma} beams is determined by virtual pair creation. Using a combination of refractive and reflective optics, efficient monochromators for {gamma} beams are being developed. Thus, we have to optimize the total system: the {gamma}-beam facility, the {gamma}-beam optics and {gamma} detectors. We can trade {gamma} intensity for band width, going down to {Delta}E{gamma}/E{gamma} Almost-Equal-To 10{sup -6} and address individual nuclear levels. The term 'nuclear photonics' stresses the importance of nuclear applications. We can address with {gamma}-beams individual nuclear isotopes and not just elements like with X-ray beams. Compared to X rays, {gamma} beams can penetrate much deeper into big samples like radioactive waste barrels, motors or batteries. We can perform tomography and microscopy studies by focusing down to {mu}m resolution using Nuclear Resonance Fluorescence (NRF) for detection with eV resolution and high spatial resolution at the same time. We discuss the dominating M1 and E1 excitations like the scissors mode, two-phonon quadrupole octupole excitations, pygmy dipole excitations or giant dipole excitations under the new facet of applications. We find many new applications in biomedicine, green energy, radioactive waste management or homeland security. Also more brilliant secondary beams of neutrons and positrons can be produced.

Habs, D.; Guenther, M. M.; Jentschel, M.; Thirolf, P. G. [Ludwig-Maximilians-Universitaet Muenchen, D-85748 Garching (Germany); Max Planck Institut fuer Quantenoptik, D-85748 Garching (Germany); Institut Laue-Langevin, F-38042 Grenoble (Germany); Ludwig-Maximilians-Universitaet Muenchen, D-85748 Garching (Germany)

2012-07-09T23:59:59.000Z

63

Measuring the /sup 247/Cm fission cross section for neutron in the range 0. 02-3. 0 MeV  

SciTech Connect (OSTI)

The authors measured the energy dependence of the cross section for curium 247 fission caused by neutrons in the energy range 0.02-3.0 MeV using the transit time method and a nuclear explosion as an impulse neutron source. A polycarbonate film was used as a fission fragment detector. Tracks resulting from Curium 247 fission fragments were grouped on the basis of neutron energy into 24 intervals ranging from 0.02 to 3.16 MeV. The tracks of fission fragments from the uranium 235 reference isotope were similarly grouped. Results are graphed and tabulated.

Fomushkin, E.F.; Novoselov, G.F.; Vinogradov, Yu.I.; Gavrilov, V.V.; Zherebtsov, V.A.

1987-10-01T23:59:59.000Z

64

Polarization Transfer in N-P Scattering at 50 Mev  

E-Print Network [OSTI]

PHYSICAL REVIEW C VOLUME 31, NUMBER 5 Polarization transfer in n-p scattering at 50 MeV MAY 1985 H. L. Woolverton, ' S. Nath, J. C. Hiebert, L. C. Northcliffe, and W. F. Woodwardt Cyclotron Institute, Texas A&M University, College Station, Texas... 77843 (Received 4 February 1985) The polarization transfer parameter D, (180') for n-p scattering has been measured at 50 MeV for the first time. Polarized neutrons produced in the H(d, n ) He reaction were scattered from the hy- drogen in a...

Woolverton, H. L.; Nath, S.; Hiebert, John C.; Northcliffe, L. C.; Woodward, W. F.

1985-01-01T23:59:59.000Z

65

Occupation number-based energy functional for nuclear masses  

E-Print Network [OSTI]

We develop an energy functional with shell-model occupations as the relevant degrees of freedom and compute nuclear masses across the nuclear chart. The functional is based on Hohenberg-Kohn theory with phenomenologically motivated terms. A global fit of the 17-parameter functional to nuclear masses yields a root-mean-square deviation of \\chi = 1.31 MeV. Nuclear radii are computed within a model that employs the resulting occupation numbers.

M. Bertolli; T. Papenbrock; S. Wild

2011-10-19T23:59:59.000Z

66

Neutron induced fission of Pu240,242 from 1 eV to 200 MeV  

Science Journals Connector (OSTI)

The neutron induced fission cross sections of Pu240,242 have been measured as a function of incident neutron energy from 1 eV to 200 MeV. This is part of an effort to reduce experimental uncertainties of nuclear data in support of next generation nuclear reactors and transmutation technology. These two plutonium isotopes are nonfissile, and the available data are limited below reaction threshold. The present data demonstrate the presence of a 2.67 eV resonance in the Pu242 fission cross section, which is missing in the ENDF/B-VII evaluation, and resolve discrepancies in the keV region. The measured cross sections are also compared with statistical model calculations made with the nuclear reaction code GNASH.

F. Tovesson; T. S. Hill; M. Mocko; J. D. Baker; C. A. McGrath

2009-01-29T23:59:59.000Z

67

Neutron-Proton Scattering near 180° at 93 Mev  

Science Journals Connector (OSTI)

A measurement has been made with neutrons of 93-Mev effective energy of the angular distribution of n-p scattering near 180° in the center-of-mass system. The results show that the magnitude of the cross section approaches the 180° point smoothly, without any sudden increase.

W. Selove; K. Strauch; F. Titus

1953-11-01T23:59:59.000Z

68

Neutron scattering above 25 MeV with monoenergetic neutrons  

Science Journals Connector (OSTI)

Technical problems encountered in measuring elastic and inelastic neutron scattering at kinetic energies well above 25 MeV are considered by extrapolating from experience with lower energy neutrons. It is concluded that all of the techniques required for a high?quality systematic study of neutron scattering—with the notable exception of a suitable accelerator facility—are at hand.

Roger W. Finlay

1985-01-01T23:59:59.000Z

69

Calculation of neutron-${}^3$He scattering up to 30 MeV  

E-Print Network [OSTI]

Microscopic calculations of four-body collisions become very challenging in the energy regime above the threshold for four free particles. The neutron-${}^3$He scattering is an example of such process with elastic, rearrangement, and breakup channels. We aim to calculate observables for elastic and inelastic neutron-${}^3$He reactions up to 30 MeV neutron energy using realistic nuclear force models. We solve the Alt, Grassberger, and Sandhas (AGS) equations for the four-nucleon transition operators in the momentum-space framework. The complex-energy method with special integration weights is applied to deal with the complicated singularities in the kernel of AGS equations. We obtain fully converged results for the differential cross section and neutron analyzing power in the neutron-${}^3$He elastic scattering as well as the total cross sections for inelastic reactions. Several realistic potentials are used, including the one with an explicit $\\Delta$ isobar excitation. There is reasonable agreement between t...

Deltuva, A

2014-01-01T23:59:59.000Z

70

Complete set of first-order polarization observables in nucleon-deuteron elastic scattering near 20 MeV deuteron energy  

Science Journals Connector (OSTI)

We have measured differential cross section and analyzing powers Ayp, iT11, T20, T21, and T22 for proton-deuteron elastic scattering near 20 MeV deuteron energy. The total error of the differential cross section was 1% or less. Each deuteron analyzing power was measured independently with the maximum efficiency. The total error of the analyzing power was less than 0.007. Faddeev calculations have been performed for three cases of nucleon-nucleon interaction. None of them gives an overall quantitative fit to the measured values. The effect of the Coulomb interaction is discussed.NUCLEAR REACTIONS H2(p?, p)H2, Ep=11.1 MeV; measured ?0(?), Ayp(?); H1(d?, d)H1, Ed=17.0, 20.0, 22.2 MeV; measured iT11(?), T20(?), T21(?), T22(?). Faddeev calculations.

M. Sawada; S. Seki; K. Furuno; Y. Tagishi; Y. Nagashima; J. Schimizu; M. Ishikawa; T. Sugiyama; L. S. Chuang; W. Grüebler; J. Sanada; Y. Koike; Y. Taniguchi

1983-05-01T23:59:59.000Z

71

Nuclear Structure and Simple Nuclear Reactions  

Science Journals Connector (OSTI)

Recently it has become increasingly evident that some assumptions in the nuclear model used for the Monte Carlo calculations yield cross section values which are not in accord with experiment. In particular, calculations of (p, pn)-reaction cross sections in the Bev energy range give values which are low by factors of two to nine when compared to experimental values. The calculated cross sections also show a smooth variation with the target atomic weight whereas the experimental values show quite an erratic variation. Reasons which have been advanced to account for this lack of agreement are the lack of a nuclear surface and failure to account for shell effects in the nuclear model used.In this work a theory is developed to take account of surface and shell effects and thereby describe the observed magnitude and variation of the cross sections for simple nuclear reactions as exemplified by the (p, pn) reaction. At multi-Bev energies to which this treatment is restricted, the main contribution to the (p, pn)-reaction cross section comes from inelastic collisions between the incident protons and target neutrons, with all the p-n collision products escaping without further interaction. Approximations and assumptions used include the impulse approximation, 0° lab scattering angle for the inelastic p-n collision products, classical trajectories for the incident and scattered particles, and a quantum-mechanical treatment for the target nucleons. The multi-Bev, n-p, cloud-chamber data was used to determine the average total exit cross section for the inelastically scattered particles. The only neutron shells in the target nucleus contributing to the (p, pn) reaction are those for which the instantaneous knocking out of a neutron creates a product-neutron hole state stable to particle emission. The combination of these assumptions gives integral expressions which, when evaluated on the IBM-701 computer for the independent particle harmonic-oscillator shell model, give the (p, pn) reaction cross sections as a function of the nuclear density distribution and the number of available shells.For the low Z nuclei where the available shells can be unambiguously determined, the results give a half-central-density radius parameter, r0, (r0=R12A13), of about 1.2 fermis compared to 1.03 fermis for the charge half radius from the electron-scattering work. Use of reasonable limits on the value of r0 allows one to set the minimum number of shells available for some targets. For example, the Zn64, Cu65, and Cu63 (p, pn) cross sections require that a large part or all the 1f72 neutrons be available, or, equivalently, that a 1f72 neutron hole state (across a major shell) in the product nucleus have less than 8- to 9-Mev excitation energy. The results also show that the energy associated with nuclear rearrangement to particle-stable product states must be less than 8 to 9 Mev. In several cases, the upper limit can be lowered considerably (to 1.5 Mev and 0 Mev in the cases of O16 and N14, respectively).

Paul A. Benioff

1960-07-01T23:59:59.000Z

72

Cl37(p, n)Ar37 excitation function up to 24 MeV: Study of (p, n) reactions  

Science Journals Connector (OSTI)

Cross sections for the Cl37(p, n)Ar37 reaction were determined from 2 to 24 MeV by the activation method. NaCl targets of natural isotopic composition were irradiated inside of Al cells having thin Havar windows. Beam intensities were determined with a Faraday cup and the Ar37 disintegration rates were measured with internal gas proportional counters. The cross sections (±6% uncertainty) increase from threshold (1.64 MeV) to a broad maximum of 365 mb at 10 MeV and then decrease to 34 mb at 23.5 MeV. These results and five other recently measured (p, n) excitation functions are compared with each other and with various cascade-evaporation calculations. Reasonable agreement was attained between experiment and calculation, and possible sources of remaining discrepancies are discussed. The Ar37 half-life is observed to be 35.02±0.05 day, in good agreement with previously reported values.NUCLEAR REACTIONS Cl37(p, n), E=2-24 MeV; measured ?(E). Natural targets, Faraday cup, internal gas proportional counters. RADIOACTIVITY Ar37; measured T12.

R. Kishore; R. Collé; S. Katcoff; J. B. Cumming

1975-07-01T23:59:59.000Z

73

The role of couplings in nuclear rainbow formation at energies far above the barrier  

SciTech Connect (OSTI)

A study of the {sup 16}O+{sup 28}Si elastic and inelastic scattering is presented in the framework of Coupled Channel theory. The Sao Paulo Potential is used in the angular distribution calculations and compared with the existing data at 75 MeV bombarding energy. A nuclear rainbow pattern is predicted and becomes more clear above 100 MeV.

Pereira, D.; Linares, R. [Instituto de Fisica, Universidade de Sao Paulo, Sao Paulo, SP (Brazil); Instituto de Fisica da Universidade Federal Fluminense, Rio de Janeiro, Niteroi, RJ (Brazil); Instituto de Fisica, Universidade de Sao Paulo, Sao Paulo, SP (Brazil); and others

2012-10-20T23:59:59.000Z

74

From sideward flow to nuclear compressibility  

SciTech Connect (OSTI)

We show that the differences between the Plastic Ball and DIOGENE experiments on sideward flow make it possible to asses independently, within the transport description of collisions, the effect of density dependence and momentum dependence of the nucleon optical potential. We estimate that the nuclear compressibility [ital K] lies between 180 and 235 MeV.

Pan, Q.; Danielewicz, P. (National Superconducting Cyclotron Laboratory and Department of Physics Astronomy, Michigan State University, East Lansing, Michigan 48824 (United States))

1993-04-05T23:59:59.000Z

75

The nuclear spin response to intermediate energy protons  

Science Journals Connector (OSTI)

Measurements of the spin-flip probability Snn for inclusive inelastic proton scattering around 300 MeV from nuclei between 12C and 90Zr show that an enhanced spin response near 40 MeV excitation at q ? 100 MeV/c is a general feature of nuclear structure. Data for 40Ca at 800 MeV confirm that the enhancement is not a peculiarity of 300 MeV scattering. In addition, measurements in 44Ca up to 75 MeV show that the enhancement cannot be attributed solely to a relatively narrow resonance. Continuum RPA calculations suggest that the enhancement is due to the exhaustion of most S = 0 strength at lower energy and a shift of S = 1 strength to higher energy.

F.T. Baker; L. Bimbot; B. Castel; R.W. Fergerson; C. Glashausser; A. Green; O. Hausser; K. Hicks; K. Jones; C.A. Miller; S.K. Nanda; R.D. Smith; M. Vetterli; J. Wambach; R. Abegg; D. Beatty; V. Cupps; C. Djalali; R. Henderson; K.P. Jackson; R. Jeppeson; J. Lisantti; M. Morlet; R. Sawafta; W. Unkelbach; A. Willis; S. Yen

1990-01-01T23:59:59.000Z

76

Penetration of 6-Mev Gamma Rays in Water  

Science Journals Connector (OSTI)

The penetration of 6-Mev gamma rays has been studied out to 190 cm in water. The dose rate has been measured with an anthracene scintillation detector as a function of the distance from the N16 source. The results agree closely out to 160 cm with the distribution calculated according to the theory of gamma-ray penetration as developed by Spencer and Fano.

P. A. Roys; K. Shure; J. J. Taylor

1954-08-15T23:59:59.000Z

77

Evolution of the N = 28 shell closure: a test bench for nuclear forces  

E-Print Network [OSTI]

Evolution of the N = 28 shell closure: a test bench for nuclear forces O. Sorlin1 and M.-G. Porquet;The N = 28 shell closure: a test bench for nuclear forces 2 reach a value of 4.8 MeV. This effect has and 90). More generally, questions related to the evolution of nuclear forces towards the drip

Boyer, Edmond

78

Nuclear Energy  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Research Programs >> Nuclear Energy Error Error Nuclear Energy Home - RCC cannot be displayed due to a timeout error. We recommend: * Refresh Nuclear Energy Home - RCC * Increasing...

79

Study of the ( 3 He , t ) Charge Transfer Reaction as a Surrogate for Neutron Energy Between 10 to 20 MeV  

Science Journals Connector (OSTI)

We have indirectly determined the 237 Np (n f) cross section over an equivalent neutron energy range from 10 to 20 MeV using the surrogate reaction 238 U ( 3 He tf). A self?supporting ?761?? g / cm 2 metallic 238 U foil was bombarded with a 42 MeV 3 He 2+ beam from the 88?Inch Cyclotron at Lawrence Berkeley National Laboratory (LBNL). Outgoing charged particles and fission fragments were identified using the Silicon Telescope Array for Reaction Studies (STARS) consisted of two 140 ?m and one 1000 ?m Micron S2 type silicon detectors. These results were compared with the 237 Np ( n f ) cross section data from the direct measurements the Evaluated Nuclear Data File (ENDF/B?VII.0) and the Japanese Evaluated Nuclear Data Library (JENDL 3.3) and found to closely follow those datasets.

M. S. Basunia; R. M. Clark; L. A. Bernstein; B. F. Lyles; J. T. Burke; C. W. Beausang; D. L. Bleuel; B. Darakchieva; F. S. Dietrich; M. Evtimova; P. Fallon; J. Gibelin; S. R. Lesher; M. A. McMahan; L. Phair; E. Rodriguez?Vieitez; M. Wiedeking

2008-01-01T23:59:59.000Z

80

Evidence for a Soft Nuclear-Matter Equation of State  

Science Journals Connector (OSTI)

The entropy of the fireball formed in central collisions of heavy nuclei at center-of-mass kinetic energies of a few hundred MeV per nucleon is estimated from the ratio of deuterons to protons at large transverse momentum. The observed paucity of deuterons suggests that strong attractive forces are present in hot, dense nuclear matter, or that degrees of freedom beyond the nucleon and pion may already be realized at an excitation energy of 100 MeV per baryon.

Philip J. Siemens and Joseph I. Kapusta

1979-11-12T23:59:59.000Z

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81

Total Neutron Cross Section for Uranium from 20 kev to 20 Mev  

Science Journals Connector (OSTI)

The total neutron cross section of normal uranium has been measured for neutron energies from 20 kev to 7.6 Mev and at 17, 19, and 20 Mev. When combined with other published work in the 7-14 Mev range, the result is a smooth cross-section curve up to 20 Mev. The curve fits smoothly on the surface showing total neutron cross section as a function of both atomic weight and neutron energy.

R. L. Henkel; L. Cranberg; G. A. Jarvis; R. Nobles; J. E. Perry; Jr.

1954-04-01T23:59:59.000Z

82

Nuclear Debate  

Science Journals Connector (OSTI)

Nuclear Debate ... This month, the Senate will consider the nominations of two women to serve on the Nuclear Regulatory Commission. ... Svinicki is a nuclear engineer with experience in the Department of Energy’s nuclear energy programs. ...

JEFF JOHNSON

2012-06-11T23:59:59.000Z

83

Relative Stopping Power of Various Metals for 20-Mev Protons  

Science Journals Connector (OSTI)

The stopping powers of Ni, Cu, Cb, Pd, Ag, Cd, In, Ta, Pt, Au, and Th, relative to Al were measured using the 20.6-Mev external proton beam of the University of California at Los Angeles cyclotron. The measurements were made with sufficient precision so that a graph of lnZ vs stopping power/electron relative to Al showed some fluctuations from a linear relationship. For Th the value differs by 2.6% in the direction found by Kelly and by Teasdale. The results are compared with the data compiled by Lindhard and Scharff.

C. P. Sonett and K. R. MacKenzie

1955-10-15T23:59:59.000Z

84

Neutron-Proton Scattering below 20 MeV  

Science Journals Connector (OSTI)

Critical examination and analysis of existing n-p scattering data below 20 MeV reveal that they provide quantitative information only about the S-wave scattering lengths and effective ranges, which are found to be at=5.396±0.011 F; as=-23.678±0.028 F; rt=1.726±0.014 F; rs=2.51±0.11±0.043 F; where the second error quoted for rs is a conservative estimate of the uncertainty due to departures from the shape-independent approximation. The correlations in error are ??at?as?=-0.7828?at?as; ??at?rs?=-0.8547?at?rs; ??as?rs?=0.7029?as?rs. An estimate of the contribution to the total cross section from scattering in higher angular momentum states, based on model calculations, p-p phases, and the cos? term in the differential cross section, allows the deviation from the shape-independent approximation to be computed at 14.1 and 19.665 MeV from total cross-section measurements. It is shown on theoretical grounds that this must come almost entirely from the S01 state, and extreme limits to this variation are established. The value found is close to zero at both energies, in accord with theoretical expectations, but the uncertainty is so large that it barely excludes the extreme limits. Some qualitative evidence for or against the existence of the long-range one pion exchange interaction in this state could be obtained by improving the experiments below 5 MeV, but the uncertainty arising from the non-S wave scattering precludes any but qualitative results. It is shown that this uncertainty cannot be removed by improved measurement of the differential cross section because 8 independent pieces of experimental information are required. We conclude that the energy variation of the S waves below 20 MeV cannot be measured without recourse to experiments which separate the spin states of the particles, such as spin-correlation, triple scattering, polarized-beam polarized-target, etc. If some information is taken from p-p scattering and some from theory, a single such measurement in each system might suffice; this minimal program is briefly discussed.

H. Pierre Noyes

1963-06-01T23:59:59.000Z

85

Triton Elastic Scattering at 20 MeV  

Science Journals Connector (OSTI)

An optical-model analysis of the elastic scattering of 20-MeV tritons from 17 nuclides, from Ca40 to Pb208, is presented. Average-parameter geometry sets as well as best-fit parameters are given. Two basic parameter families are considered, these being based on real-well radius parameters of 1.25 and 1.16 F, respectively. Average-geometry fits to all of the data indicate that the real-well depth is almost constant for all nuclides, whereas the imaginary depth shows a strong dependence on (N-Z)A.

E. R. Flynn; D. D. Armstrong; J. G. Beery; A. G. Blair

1969-06-20T23:59:59.000Z

86

Small-Angle Proton-Proton Scattering at 20 Mev  

Science Journals Connector (OSTI)

The differential cross section for the scattering of 19.8-Mev protons by protons has been measured for angles between 18° and 35° in the center-of-mass system, detection being by photographic emulsion placed in a scattering camera. Cross sections were measured simultaneously at all angles and azimuths. A run with analyzing slits closed served to evaluate the small slit-edge correction. The accuracy of the cross-section measurements is approximately 2.5% at all angles except 18°, where the accuracy is about 3%.

Herbert N. Royden and Byron T. Wright

1959-01-01T23:59:59.000Z

87

Nuclear Data Evaluations for Americium Isotopes  

SciTech Connect (OSTI)

Recent upgrades of 241Am, 242mAm, and 240Am nuclear data in the keV - 30-MeV range are described. The new evaluation takes advantage of recent measurements and advances in calculational modeling methods. The model calculations are especially important for the nuclear data of americium isotopes, because few measurements are available. The nuclear-model code GNASH is extensively used for our evaluations. The new evaluations are given for total, fission, capture (n, 2n), and (n, 3n) reaction cross sections, and vp for 241Am and 242mAm. A new evaluation for 240Am is also given by expanding our modeling feasibility.

Kawano, T.; Talou, P.; Chadwick, M.B.; MacFarlane, R.E.; Young, P.G. [T-16 Nuclear Physics, Los Alamos National Laboratory (United States)

2005-05-24T23:59:59.000Z

88

Photonuclear Activation by 20.5-Mev Gamma Rays  

Science Journals Connector (OSTI)

The photonuclear activation cross section of elements whose (?, n) cross sections lead to a suitable positron activity has been measured using monochromatic gamma rays from the T3(p, ?)He4 reaction. The gamma rays were monitored by a 3-in. diam by 4-in. long sodium iodide crystal and calibrated with a 4½×6 in. crystal whose response curve to the ? rays was determined. The absorption coefficient of these photons in NaI was determined by a good geometry transmission experiment. The positron activity was determined by a coincidence detector, consisting of two 5-in. diam by 2-in. long NaI crystals set on the annihilation radiation photopeaks. This detector was calibrated against a F18 positron source standardized in a 2? flow counter.The C12(?, n)C11 and F19(?, n)F18 reactions were investigated over the range from 20.1 to 21.2 Mev. Structure, although reported by other experimenters, was not observed. The (?, n) activation cross section was measured at 20.5 Mev for O16, Cr50, Fe54, Cu63, Zn64, Mo92, Sb121, and Pr141, giving cross section of 0.60±0.12, 29.1±6.0, 30.0±4.8, 52.5±2.5, 35.7±1.8, 35.4±2.5, 33.4±2.7, 51.7±5.5, respectively.

W. E. Del Bianco and W. E. Stephens

1962-04-15T23:59:59.000Z

89

Nuclear Resonance Fluorescence for Nuclear Materials Assay  

E-Print Network [OSTI]

Potential of Nuclear Resonance Fluorescence . . . . . . . .2.9.1 Nuclear ThomsonSections . . . . . . . . . . . . . . . Nuclear Resonance

Quiter, Brian Joseph

2010-01-01T23:59:59.000Z

90

Nuclear Returns  

Science Journals Connector (OSTI)

Nuclear Returns ... For the first time since 1978, the Nuclear Regulatory Commission has given the green light for a new U.S. nuclear power plant. ... NRC granted a license to Southern Co. to build and operate twin 1,100-MW reactors adjacent to two operating nuclear power plants at its Vogtle nuclear facility, near Waynesboro, Ga. ...

JEFF JOHNSON

2012-02-19T23:59:59.000Z

91

Nuclear Fusion  

Science Journals Connector (OSTI)

Although not yet developed at the commercial stage, nuclear fusion technology is still being considered as a ... used in nuclear warfare. Since research in nuclear fusion for the production of energy started abou...

Ricardo Guerrero-Lemus; José Manuel Martínez-Duart

2013-01-01T23:59:59.000Z

92

Nuclear Nonproliferation  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Nuclear Nonproliferation As more countries embrace nuclear power as a cost-effective and clean alternative to fossil fuels, the need exists to ensure that the nuclear fuel cycle is...

93

Nuclear spin and isospin excitations  

Science Journals Connector (OSTI)

A review is given of our present knowledge of collective spin-isospin excitations in nuclei. Most of this knowledge comes from intermediate-energy charge-exchange reactions and from inelastic electron- and proton-scattering experiments. The nuclear-spin dynamics is governed by the spin-isospin-dependent two-nucleon interaction in the medium. This interaction gives rise to collective spin modes such as the giant Gamow-Teller resonances. An interesting phenomenon is that the measured total Gamow-Teller transition strength in the resonance region is much less than a model-independent sum rule predicts. Two physically different mechanisms have been discussed to explain this so-called quenching of the total Gamow-Teller strength: coupling to subnuclear degrees of freedom in the form of ?-isobar excitation and ordinary nuclear configuration mixing. Both detailed nuclear structure calculations and extensive analyses of the scattering data suggest that the nuclear configuration mixing effect is the more important quenching mechanism, although subnuclear degrees of freedom cannot be ruled out. The quenching phenomenon occurs for nuclear-spin excitations at low excitation energies (??10-20 MeV) and small-momentum transfers (q?0.5 fm-1). A completely opposite effect is anticipated in the high (?, q)-transfer region (0???500 MeV, 0.5?q?3 fm-1). The nuclear spin-isospin response might be enhanced due to the attractive pion field inside the nucleus. Charge-exchange reactions at GeV incident energies have been used to study the quasifree peak region and the ?-resonance region. An interesting result of these experiments is that the ? excitation in the nucleus is shifted downwards in energy relative to the ? excitation of the free proton. The physical origin of this shift is discussed, and it is shown that it may be related to the energy-dependent, attractive one-pion exchange interaction in the medium.

Franz Osterfeld

1992-04-01T23:59:59.000Z

94

Light-ion production in the interaction of 175 MeV quasi-mono-energetic neutrons with iron and with bismuth  

E-Print Network [OSTI]

Nuclear data for neutron-induced reactions in the intermediate energy range of 20 to 200 MeV are of great importance for the development of nuclear reaction codes since little data exist in that range. Also several different applications benefit from such data, notably accelerator-driven incineration of nuclear waste. The Medley setup was used for a series of measurements of p, d, t, $^3$He and $\\alpha$-particle production by 175 MeV quasi-mono-energetic neutrons on various target nuclei. The measurements were performed at the The Svedberg Laboratory in Uppsala, Sweden. Eight detector telescopes placed at angles between 20$^\\circ$ and 160$^\\circ$ were used. Medley uses the $\\Delta E$-$\\Delta E$-$E$ technique to discriminate among the particle types and is able to measure double-differential cross sections over a wide range of particle energies. This paper briefly describes the experimental setup, summarizes the data analysis and reports on recent changes in the previously reported preliminary data set on bismuth. Experimental data are compared with INCL4.5-Abla07, MCNP6 using CEM03.03, TALYS and PHITS model calculations as well as with nuclear data evaluations. The models agree fairly well overall but in some cases systematic differences are found.

R. Bevilacqua; K. Jansson; S. Pomp; P. Andersson; J. Blomgren; C. Gustavsson; A. Hjalmarsson; V. D. Simutkin; M. Österlund; A. J. Koning; A. V. Prokofiev; M. Hayashi; S. Hirayama; Y. Naitou; Y. Watanabe; U. Tippawan; S. G. Mashnik; L. M. Kerby; F. -R. Lecolley; N. Marie; J. -C. David; S. Leray

2014-11-12T23:59:59.000Z

95

Nuclear Engineering Nuclear Criticality Safety  

E-Print Network [OSTI]

Nuclear Engineering Nuclear Criticality Safety The Nuclear Engineering Division (NE) of Argonne National Laboratory is experienced in performing criticality safety and shielding evaluations for nuclear, and neutron spectra. The NE nuclear criticality safety (NCS) capabilities are based on a staff with decades

Kemner, Ken

96

Proton-Proton Bremsstrahlung Measurements at 20 MeV  

Science Journals Connector (OSTI)

We have measured the proton-proton bremsstrahlung cross section, d?d?1d?2, with 20-MeV incident proton energy, detecting coincident protons at 25° and at 30° on either side of the beam. In addition, we have determined the photon angular distributions, d?d?1d?2d??. The value measured for d?d?1d?2 for proton angles of 25° is 0.68 ± 0.07 ?b/sr2 while that for 30° is 0.69 ± 0.07 ?b/sr2. These results are for coplanar geometry and are determined from the data using the azimuthal angular dependence for the cross section predicted by Drechsel and Maximon. The results agree with the predictions of Marker and Signell, when Coulomb corrections are included.

Derek W. Storm and R. Heffner

1971-11-01T23:59:59.000Z

97

NUCLEAR REACTORS.  

E-Print Network [OSTI]

??Nuclear reactors are devices containing fissionable material in sufficient quantity and so arranged as to be capable of maintaining a controlled, self-sustaining NUCLEAR FISSION chain… (more)

Belachew, Dessalegn

2010-01-01T23:59:59.000Z

98

nuclear reactor  

Science Journals Connector (OSTI)

...a complex atomic apparatus used to obtain energy from nuclear fission chain reaction. Used to produce nuclear energy, radioactive isotopes, and artificial elements.... atomic pile ...

2009-01-01T23:59:59.000Z

99

Nuclear Energy  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Nuclear Energy Idaho National Laboratory is the Department of Energy's lead nuclear energy research and development facility. Building upon its legacy responsibilities,...

100

Nuclear Hydrogen  

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Error Error Nuclear Hydrogen - RCC cannot be displayed due to a timeout error. We recommend: * Refresh Nuclear Hydrogen - RCC * Increasing your portlet timeout setting. *...

Note: This page contains sample records for the topic "mev cm-1 nuclear" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

Nuclear Physics  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Underground Research Facility in South Dakota, which will search for neutrinoless double-beta decay. Strong Los Alamos programs in nuclear data and nuclear theory supports...

102

Neutrons from multiplicity-selected La-La and Nb-Nb collisions at 400A MeV and La-La collisions at 250A MeV  

E-Print Network [OSTI]

Triple-differential cross sections for neutrons from high-multiplicity La-La collisions at 250 and 400 MeV per nucleon and Nb-Nb collisions at 400 MeV per nucleon were measured at several polar angles as a function of the azimuthal angle with respect to the reaction plane of the collision. The reaction plane was determined by a transverse-velocity method with the capability of identifying charged-particles with Z=1, Z=2, and Z > 2. The flow of neutrons was extracted from the slope at mid-rapidity of the curve of the average in-plane momentum vs the center-of-mass rapidity. The squeeze-out of the participant neutrons was observed in a direction normal to the reaction plane in the normalized momentum coordinates in the center-of-mass system. Experimental results of the neutron squeeze-out were compared with BUU calculations. The polar-angle dependence of the maximum azimuthal anisotropy ratio $r(\\theta)$ was found to be insensitive to the mass of the colliding nuclei and the beam energy. Comparison of the observed polar-angle dependence of the maximum azimuthal anisotropy ratio $r(\\theta)$ with BUU calculations for free neutrons revealed that $r(\\theta)$ is insensitive also to the incompressibility modulus in the nuclear equation of state.

M. M. Htun; R. Madey; W. M. Zhang; M. Elaasar; D. Keane; B. D. Anderson; A. R. Baldwin; J. Jiang; A. Scott; Y. Shao; J. W. Watson; K. Frankel; L. Heilbronn; G. Krebs; M. A. McMahan; W. Rathbun; J. Schambach; G. D. Westfall; S. Yennello; C. Gale; J. Zhang; .

1998-11-30T23:59:59.000Z

103

Decay of the 2.34- and 2.71-MeV States of B  

Science Journals Connector (OSTI)

Proton emission from B9 states at 2.34 and 2.71 MeV has been investigated by populating the states in the B10(He3,?)B9 reaction and by measuring ?-p coincidences with a 2-dimensional pulse-height analyzer. The 2.34-MeV J?=52- level decays less than 0.5% by proton emission to the ground state of Be8, while the 2.71-MeV level decays nearly 100% by this route. The 1f proton reduced width of the 2.34-MeV level for the ground state of Be8 (in units of) ?2mR2) is then less than 5×10-3 when R has the value 4.35 F. The co-incidence method clearly resolves the 2.71-MeV J?=52+ state from the 2.34-MeV state and background, its excitation and width being 2.71±0.03 MeV and 0.71±0.06 MeV, respectively. These figures imply a 1d proton reduced width of the 2.71-MeV state for the ground state of Be8 of about 0.7.

D. H. Wilkinson; J. T. Sample; D. E. Alburger

1966-06-17T23:59:59.000Z

104

E-Print Network 3.0 - activation 14-mev neutrons Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Sample search results for: activation 14-mev neutrons Page: << < 1 2 3 4 5 > >> 1 The Neutron Scattering Society www.neutronscattering.org Summary: techniques; and service and...

105

Neutron-Alpha Scattering in the 20-MeV Range  

Science Journals Connector (OSTI)

Angular distributions of neutrons scattered by ? particles were measured from 16- to 26-MeV neutron energy by observing the recoiling ? particles in a high-pressure gas scintillator. Above 22 MeV, disintegration particles from the He4(n, d)T reaction were observed, also. Data were taken in 25-keV steps over the He5 state at 16.7-MeV excitation energy (22.15-MeV neutron energy) and over the He4(n, np)T, He4(n, n?)He4*, and He4(n, 2n)He3 thresholds. Total cross sections of helium were measured at 26 energies from 20- to 29-MeV neutron energy in a good geometry transmission experiment. Angular distributions at neutron energies <24 MeV were fitted with expansions of Legendre polynomials. Polynomials of order 0 through 4 provided a satisfactory fit. Below 22 MeV the angular distributions agree with calculations based on n-? phase shifts suggested by Perkins. Above 22 MeV the agreement is not as good. The total cross sections agree only qualitatively with these calculations. The total cross section and angular-distribution data are consistent with a 32+ assignment for the 16.7-MeV level. The measured yield curve for the He4(n, d)T reaction agrees with that computed from the cross section for the inverse reaction.

R. E. Shamu and J. G. Jenkin

1964-07-13T23:59:59.000Z

106

Nuclear Matter and Nuclear Dynamics  

E-Print Network [OSTI]

Highlights on the recent research activity, carried out by the Italian Community involved in the "Nuclear Matter and Nuclear Dynamics" field, will be presented.

M Colonna

2009-02-26T23:59:59.000Z

107

Nuclear data requirements for accelerator?driven transmutation systems  

Science Journals Connector (OSTI)

The possibilities of several new technologies based on use of intense medium?energy proton accelerators are being investigated at Los Alamos National Laboratory. The potential new areas include destruction of long?lived components of nuclear waste plutonium burning energy production and production of tritium. The design assessment and safety analysis of potential facilities involves the understanding of complex combinations of nuclear processes which in turn places new requirements on nuclear data that transcend the traditional needs of the fission and fusion reactor communities. In this paper an assessment of the nuclear data needs for systems currently being considered in the Los Alamos Accelerator?Driven Transmutation Technologies program is given. The importance of developing neutron and proton cross section libraries in the incident particle energy range of 20 MeV to approximately 200 MeV for transport applications is discussed and new theoretical methods for developing cross section libraries at higher incident neutron and proton energies are summarized.

P. G. Young; W. B. Wilson; M. B. Chadwick

1995-01-01T23:59:59.000Z

108

Nuclear choices  

SciTech Connect (OSTI)

This book contains part of the series New Liberal Arts, which is intended to make science and technology more accessible to students of the liberal arts. Volume in hand provides a comprehensive, multifaceted examination of nuclear energy, in nontechnical terms. Wolfson explains the basics of nuclear energy and radiation, nuclear power..., and nuclear weapons..., and he invites readers to make their own judgments on controversial nuclear issues. Illustrated with photos and diagrams. Each chapter contains suggestions for additional reading and a glossary. For policy, science, and general collections in all libraries. (ES) Topics contained include Atoms and nuclei. Effects and uses of radiation. Energy and People. Reactor safety. Nuclear strategy. Defense in the nuclear age. Nuclear power, nuclear weapons, and nuclear futures.

Wolfson, R.

1991-01-01T23:59:59.000Z

109

Siberian Branch of Russian Academy of Science Budker Institute of Nuclear Physics  

E-Print Network [OSTI]

Institute of Nuclear Physics, SB RAS, Novosibirsk, Russia The ion-optical channel of vacuum insulation-optical channel of 2.5 MeV 10 mA tandem accelerator are proposed. © Budker Institute of Nuclear Physics #12] the BINP staff is developing the electrostatic tandem accelerator with vacuum insulation of the protons

Taskaev, Sergey Yur'evich

110

Entropy production in the Au+Au reaction between 150A and 800A MeV  

Science Journals Connector (OSTI)

The entropy per nucleon (S/A) has been extracted for the Au [(150–800)A MeV] + Au reaction by using the phase I setup of the 4? facility at GSI, Darmstadt. The entropy has been obtained from the comparison of various observables characterizing the dM/dZ fragment multiplicity distributions, extending up to Z?15, with those calculated with the quantum statistical model. It is the first time that S/A values are determined by considering the full ensemble of charged products detected in the reaction. Consistent values of S/A are found from different methods. These entropy values are shown to be fairly independent of the volume of the ‘‘participant’’ region considered. They are somewhat lower than those extracted in earlier works but are in good agreement with hydrodynamic calculations and suggest a low viscosity for the hot and dense nuclear matter.

C. Kuhn et al.

1993-09-01T23:59:59.000Z

111

Symmetric and asymmetric fission modes in proton-induced fission at 660 MeV of {sup 238}U  

SciTech Connect (OSTI)

Fission product cross sections of intermediate-energy fission of {sup 238}U were used in order to construct the charge and mass yield distributions. Enriched target of {sup 238}U was irradiated by proton beam with energy 660 MeV for several hours at the LNP Phasotron, Joint Institute for Nuclear Research (JINR), Dubna, Russia. The charge distribution of the fission fragments was analyzed for calculation of isobaric cross sections. The mass yield curves were expanded into symmetric and asymmetric components according multimodal fission approach. The fissility values of actinides were calculated at given proton energy. The obtained results have been compared to the same data for targets {sup 237}Np and {sup 241}Am.

Balabekyan, A. R., E-mail: balabekyan@ysu.am; Karapetyan, G. S. [Yerevan State University (Armenia); Demekhina, N. A.; Adam, J. [JINR (Russian Federation); Katovsky, K. [Czech Technical University in Prague, Department of Nuclear Reactors (Czech Republic)

2010-11-15T23:59:59.000Z

112

Nuclear Data Sheets for A = 230  

SciTech Connect (OSTI)

The evaluators present in this publication spectroscopic data and level schemes from radioactive decay and nuclear reactions for all isobars with mass number A=230. This evaluation includes the first experimental evidence of {sup 230}Am, produced through the {sup 197}Au({sup 40}Ar,3n){sup 234}Bk ({alpha} decay to {sup 230}Am) reaction, E({sup 40}Ar)=188.4 MeV (2003MoZX).

Browne, E.; Tuli, J.K. [National Nuclear Data Center, Brookhaven National Laboratory, Upton, New York 11973-5000 (United States)

2012-08-15T23:59:59.000Z

113

Nuclear Astrophysics in Rare Isotope Facilities C.A. Bertulania  

E-Print Network [OSTI]

, beam energies should be in the range of a few 10-100 MeV per nucleon [5]. Low energy reactions projectile velocity va, the low energy reaction A + x = B + c is induced at very low (even vanishing and Astronomy, Texas A&M University, Commerce, TX 75429, USA Nuclear reactions in stars are difficult to measure

Bertulani, Carlos A. - Department of Physics and Astronomy, Texas A&M University

114

Neutron-Proton Scattering at 156$\\,\\pm \\,$3 MeV  

Science Journals Connector (OSTI)

8 July 1952 research-article Neutron-Proton Scattering at 156 3 MeV T. C. Randle A. E. Taylor E. Wood The angular distribution for neutron-proton scattering at 156 3 MeV has been determined for centre-of-mass scattering angles between...

1952-01-01T23:59:59.000Z

115

Light-ion production in the interaction of 175 MeV quasi-mono-energetic neutrons with iron and with bismuth  

E-Print Network [OSTI]

Nuclear data for neutron-induced reactions in the intermediate energy range of 20 to 200 MeV are of great importance for the development of nuclear reaction codes since little data exist in that range. Also several different applications benefit from such data, notably accelerator-driven incineration of nuclear waste. The Medley setup was used for a series of measurements of p, d, t, $^3$He and $\\alpha$-particle production by 175 MeV quasi-mono-energetic neutrons on various target nuclei. The measurements were performed at the The Svedberg Laboratory in Uppsala, Sweden. Eight detector telescopes placed at angles between 20$^\\circ$ and 160$^\\circ$ were used. Medley uses the $\\Delta E$-$\\Delta E$-$E$ technique to discriminate among the particle types and is able to measure double-differential cross sections over a wide range of particle energies. This paper briefly describes the experimental setup, summarizes the data analysis and reports on recent changes in the previously reported preliminary data set on bism...

Bevilacqua, R; Pomp, S; Andersson, P; Blomgren, J; Gustavsson, C; Hjalmarsson, A; Simutkin, V D; Österlund, M; Koning, A J; Prokofiev, A V; Hayashi, M; Hirayama, S; Naitou, Y; Watanabe, Y; Tippawan, U; Mashnik, S G; Kerby, L M; Lecolley, F -R; Marie, N; David, J -C; Leray, S

2014-01-01T23:59:59.000Z

116

defense nuclear security | National Nuclear Security Administration  

National Nuclear Security Administration (NNSA)

nuclear security | National Nuclear Security Administration People Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response...

117

Chernobyl Nuclear Accident | National Nuclear Security Administration  

National Nuclear Security Administration (NNSA)

Chernobyl Nuclear Accident | National Nuclear Security Administration People Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response...

118

Countering Nuclear Terrorism and Trafficking | National Nuclear...  

National Nuclear Security Administration (NNSA)

Countering Nuclear Terrorism and Trafficking | National Nuclear Security Administration People Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy...

119

Optical-Model Parameters for the C-12(li-7,li-7)c-12 Reaction at 63 and 78.7 Mev  

E-Print Network [OSTI]

of energies via simple changes in the depths of the potentials, NUCLEAR REACTIONS ~2 C('Li, 'Li) and ~2 C{'Li,'Li') E('Li)=68 and 78.7 MeV; measured o-{&); deduced optical model parameters; deduced deformation lengths for YLi* and C*. Natural targets, DWBA... the most forward angle elastic scattering cross sections with several OM parameter sets; the 1980The American Physica1 Society OPTICAL MODEL PARAMETERS FOR THE ~2 C(7Li, 7Li). . . normalization factor was treated as a free para- meter. The magnitude...

Zeller, A. F.; Lui, YW; Tribble, Robert E.; Tanner, D. M.

1980-01-01T23:59:59.000Z

120

Fragment flow for {sup 197}Au+{sup 197}Au collisions at E/A = 100, 250 and 400 MeV  

SciTech Connect (OSTI)

Information about compressed high density nuclear matter can be obtained by studying collective flow exhibited by particles emitted in heavy ion induced reactions. Charged particles have been measured in 4{pi} coverage for {sup 197}Au + {sup 197}Au collisions at E/A = 100, 250 and 400 MeV using the Miniball/Wall, the Catania Silicon-CsI array and the Aladin Spectrometer. Collective observables such as transverse sideward flow, radial flow and squeezeout will be discussed and the measured values will be compared to transport models.

Tsang, M.B.; Danielewicz, P.; Hsi, W.C. [and others

1995-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "mev cm-1 nuclear" 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

High-energy behavior of the nuclear symmetry potential in asymmetric nuclear matter  

E-Print Network [OSTI]

Using the relativistic impulse approximation with empirical NN scattering amplitude and the nuclear scalar and vector densities from the relativistic mean-field theory, we evaluate the Dirac optical potential for neutrons and protons in asymmetric nuclear matter. From the resulting Schr\\"{o}% dinger-equivalent potential, the high energy behavior of the nuclear symmetry potential is studied. We find that the symmetry potential at fixed baryon density is essentially constant once the nucleon kinetic energy is greater than about 500 MeV. Moreover, for such high energy nucleon, the symmetry potential is slightly negative below a baryon density of about $% \\rho =0.22$ fm$^{-3}$ and then increases almost linearly to positive values at high densities. Our results thus provide an important constraint on the energy and density dependence of nuclear symmetry potential in asymmetric nuclear matter.

Lie-Wen Chen; Che Ming Ko; Bao-An Li

2005-12-07T23:59:59.000Z

122

Thermal Properties of Asymmetric Nuclear Matter  

E-Print Network [OSTI]

The thermal properties of asymmetric nuclear matter are investigated in a relativistic mean- field approach. We start from free space NN-interactions and derive in-medium self-energies by Dirac-Brueckner theory. By the DDRH procedure we derive in a self-consistent approach density- dependent meson-baryon vertices. At the mean-field level, we include isoscalar and isovector scalar and vector interactions. The nuclear equation of state is investigated for a large range of total baryon densities up to the neutron star regime, the full range of asymmetries from symmetric nuclear matter to pure neutron matter, and temperatures up to T~100 MeV. The isovector-scalar self-energies are found to modify strongly the thermal properties of asymmetric nuclear matter. A striking result is the change of phase transitions when isovector-scalar self-energies are included.

Fedoseew, Andreas

2014-01-01T23:59:59.000Z

123

Nuclear Science  

Broader source: Energy.gov (indexed) [DOE]

Science Science and Engineering Education Sourcebook 2013 American Nuclear Society US Department of Energy Nuclear Science & Engineering Education Sourcebook 2013 North American Edition American Nuclear Society Education, Training, and Workforce Division US Department of Energy Office of Nuclear Energy Editor and Founder John Gilligan Professor of Nuclear Engineering North Carolina State University Version 5.13 Welcome to the 2013 Edition of the Nuclear Science and Engineering Education (NS&EE) Sourcebook. We have evolved and improved! The core mission of the Sourcebook has not changed, however. Our purpose is to facilitate interaction among faculty, students, industry, and government agencies to accomplish nuclear research, teaching and service activities. Since 1986 we have compiled critical information on nuclear

124

Nuclear reactions  

Science Journals Connector (OSTI)

Much reference has been made in the last chapter to nuclear energy levels and their various properties (e.g ... ways of doing this — the use of nuclear reactions, and studies of how excited nuclei...

R. J. Blin-Stoyle FRS

1991-01-01T23:59:59.000Z

125

nuclear security  

National Nuclear Security Administration (NNSA)

3%2A en Shaping the future of nuclear detection http:nnsa.energy.govblogshaping-future-nuclear-detection

126

Nuclear Ukraine  

Science Journals Connector (OSTI)

... SIR - Your article (Nature 365, 599; 1993) on the US-Ukraine stalemate over nuclear weapons prompts the following remarks. The United States made a mistake ... nuclear weapons prompts the following remarks. The United States made a mistake in not recognizing Ukraine as a legitimate successor state to the Soviet nuclear arsenal and is still insisting that ...

Arno Arrak

1994-01-13T23:59:59.000Z

127

Neutron Scattering at 2.2 Mev by Time of Flight  

Science Journals Connector (OSTI)

A millimicrosecond time-of-flight technique has been applied to a study of the scattering of 2.2-Mev neutrons from targets of Fe, Pb206, and Y. The 3-Mev phase-focused proton beam from the BNL 18-inch cyclotron was used to produce high-intensity neutron pulses in the T(p, n)He3 reaction. The angular distributions of the elastically scattered neutrons have been measured for the above targets. The angular distributions of the inelastically scattered neutrons from the 0.845-Mev level in Fe56 and from the 0.803-Mev level in Pb206 have been carefully studied, and were found to be symmetric about ?c.m.=90°. The angular distributions of the inelastically scattered neutrons from levels at 1.34 and 1.43 Mev in Pb206 and from levels at 0.913 and 1.53 Mev in Y have been measured, and also appear to be symmetric about ?c.m.=90°. The inelastic scattering from Pb206 shows evidence for a new level at 1.15 Mev.

H. H. Landon; A. J. Elwyn; G. N. Glasoe; S. Oleksa

1958-11-15T23:59:59.000Z

128

High-Energy Neutrons Produced by 740-MeV Protons on Uranium  

Science Journals Connector (OSTI)

Neutron spectra from 740-MeV proton bombardment of a 30-cm-thick depleted U238 target were measured from 20 to 500 MeV at 50° and from 5 to 140 MeV at 130° with respect to the proton beam. Measurements were made at the Lawrence Berkeley Laboratory (LBL) 184-in. cyclotron with a self-contained neutron time-of-flight spectrometer. The results are compared with a Monte Carlo calculation of the neutron cascade-evaporation spectrum. While the shapes of the measured and calculated spectra are in general agreement, this comparison shows that the intranuclear cascade model underestimates the production of cascade neutrons at wide angles; furthermore, this comparison shows that this discrepancy increases with increasing angle of emission. At 50°, the yield of neutrons above 25 MeV is 1.4 times that calculated; at 130°, this factor increases to 1.6. For neutrons above 25 MeV, the measured yield at 50° is 5 times greater than that at 130°. From the measurements at 50 and 130°, it is estimated that the total integrated yield above 25 MeV is 0.95 neutrons per incident proton; the Monte Carlo calculation predicts 0.67 neutrons per incident proton. Below 20 MeV, the results are in agreement with the calculation.

Richard Madey and Frank M. Waterman

1973-12-01T23:59:59.000Z

129

Nuclear Recoil and Simple Nuclear Reactions  

Science Journals Connector (OSTI)

The nuclear-recoil properties of simple nuclear reactions are studied in the distorted-wave impulse approximation. Calculations of the differential recoil cross section d2?d?KdTK, and the recoil angular distribution d?d?K, for the C12(p, pn)C11 and Ni58(p, pn)Ni57 reactions at 450 MeV are presented and discussed. Relativistic kinematics are used and the calculations are not limited to coplanar events: they are valid for any type of kinematically allowed event. Harmonic-oscillator and exponential radial wave functions are used along with a complex, energy-dependent, Woods-Saxon optical potential. The calculations show appreciable differences between the exponential and harmonic-oscillator forms and also between distorted- and plane-wave calculations. In general, curves of d2?d?KdTK plotted as a function of TK for fixed ?K, show steeper narrower peaks and larger flatter tails at ?K=90° than at ?K=0° or 180°. Comparison of the recoil angular distribution for outlying target neutron shells (1p in C12 and 2p in Ni58) and interior shells (1s in C12 and 1f in Ni58) shows a definite sideways peaking for the outlying shells which is lacking for the interior shells. This effect is explained as being a result of the equatorial localization of reaction sites which is greater for outer shells than for inner shells. Comparison with the small number of experimental data available indicates satisfactory agreement, except possibly for sideways recoil angles where, according to Remsberg, another reaction mechanism may be contributing.

Paul A. Benioff and Lucy Wu Person

1965-11-22T23:59:59.000Z

130

Nuclear Engineer (Nuclear Safety Specialist)  

Broader source: Energy.gov [DOE]

A successful candidate of this position will serve as a Nuclear Engineer (Nuclear Safety Specialist) responsible for day-to-day technical monitoring, and evaluation of aspects of authorization...

131

NEUTRONINDUCED FISSION CROSS SECTIONS OF 232 Th, 233 U, 238 U, 237 Np, 239 Pu, nat Pb AND 209 Bi RELATIVE TO 235 U IN THE ENERGY RANGE 1--200 MeV  

E-Print Network [OSTI]

. A water­cooled lead target situated inside the vacuum chamber of the accelerator is used as a pulsed, Russia 2 Nuclear Data Center/JAERI, Tokai­mura, Naka­gun, Ibaraki­ken, 319-1195, Japan 3 Radiation for actinides above 20 MeV, the most important are accelerator­driven transmutation of waste reactor materials

Titov, Anatoly

132

Nuclear Deterrence  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Nuclear Deterrence Nuclear Deterrence Nuclear Deterrence LANL's mission is to develop and apply science and technology to ensure the safety, security, and effectiveness of the U.S. nuclear deterrent; reduce global threats; and solve other emerging national security and energy challenges. April 12, 2012 A B-2 Spirit bomber refuels from a KC-135 Stratotanker A B-2 Spirit bomber refuels from a KC-135 Stratotanker. Contact Operator Los Alamos National Laboratory (505) 667-5061 Charlie McMillan, Director: "For the last 70 years there has not been a world war, and I have to think that our strong deterrent has something to do with that fact." Mission nuclear weapons Charlie McMillan, Director of Los Alamos National Laboratory 1:06 Director McMillan on nuclear deterrence While the role and prominence of nuclear weapons in U.S. security policy

133

Photon energy absorption coefficients for nuclear track detectors using Geant4 Monte Carlo simulation  

Science Journals Connector (OSTI)

Abstract Geant4 Monte Carlo code simulations were used to solve experimental and theoretical complications for calculation of mass energy-absorption coefficients of elements, air, and compounds. The mass energy-absorption coefficients for nuclear track detectors were computed first time using Geant4 Monte Carlo code for energy 1 keV–20 MeV. Very good agreements for simulated results of mass energy-absorption coefficients for carbon, nitrogen, silicon, sodium iodide and nuclear track detectors were observed on comparison with the values reported in the literatures. Kerma relative to air for energy 1 keV–20 MeV and energy absorption buildup factors for energy 50 keV–10 MeV up to 10 mfp penetration depths of the selected nuclear track detectors were also calculated to evaluate the absorption of the gamma photons. Geant4 simulation can be utilized for estimation of mass energy-absorption coefficients in elements and composite materials.

Vishwanath P. Singh; M.E. Medhat; N.M. Badiger

2015-01-01T23:59:59.000Z

134

Measurement of Proton-Proton Polarization at 20 MeV  

Science Journals Connector (OSTI)

The (p, p) polarization asymmetry has been measured at 20.2-MeV laboratory energy with an accuracy as good as ±0.001. The results are consistent with the phase-shift analyses at this energy.

P. Catillon; J. Sura; A. Tarrats

1968-03-18T23:59:59.000Z

135

Negative pion-nucleus elastic scattering at 20 and 40 MeV  

Science Journals Connector (OSTI)

Differential cross sections for the elastic scattering of 20 and 40 MeV ?- by nuclei ranging from C12 to Pb208 are reported. Comparisons are made with the predictions of the Michigan State University (MSU) optical potential.

G. Burleson; G. Blanpied; W. Cottingame; G. Daw; B. Park; K. K. Seth; D. Barlow; S. Iversen; M. Kaletka; H. Nann; A. Saha; D. Smith; R. P. Redwine; W. Burger; M. Farkhondeh; B. Saghai; R. Anderson

1994-04-01T23:59:59.000Z

136

Fission Product Yields of Uranium Bombarded with Deuterons of Various Energies (20-190 Mev)  

Science Journals Connector (OSTI)

The formation cross sections of Sr89, Zr97, Pd109, Pd112, Ag111, and Ba140 were measured from the bombardment of natural uranium with deuterons of various energies (20-190 Mev).

Harry G. Hicks; Peter C. Stevenson; Richard S. Gilbert; William H. Hutchin

1955-12-01T23:59:59.000Z

137

Beam diagnostics measurements at 3 MeV of the LINAC4 H- beam at CERN  

E-Print Network [OSTI]

As part of the CERN LHC injector chain upgrade, LINAC4 [1, 2] will accelerate H- ions to 160 MeV, replacing the old 50 MeV proton linac. The ion source, the Low Energy Beam Transfer (LEBT) line, the 3 MeV Radio Frequency Quadrupole and the Medium Energy Beam Transfer (MEBT) line hosting a chopper, have been commissioned in the LINAC4 tunnel. Diagnostic devices are installed in the LEBT and MEBT line and in a movable diagnostics test bench which is temporarily added to the MEBT exit. The paper gives an overview of all the instruments used, including beam current transformers, beam position monitors, wire scanners and wire grids for transverse profile measurements, a longitudinal bunch shape monitor and a slit-and-grid emittance meter. The instrumentation performance is discussed and the measurement results that allowed characterizing the 3 MeV beam in the LINAC4 tunnel are summarized.

Zocca, F; Duraffourg, M; Focker, G J; Gerard, D; Kolad, B; Lenardon, F; Ludwig, M; Raich, U; Roncarolo, F; Sordet, M; Tan, J; Tassan-Viol, J; Vuitton, C; Feshenko, A

2014-01-01T23:59:59.000Z

138

Angular Distribution and Recoil Effect for 1 MeV Au+ Ions through...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

compounds. In this work, time-of-flight secondary ion mass spectrometry (ToF-SIMS) is applied to determine the angular distribution of 1 MeV Au ions after penetrating a...

139

Plasma devices to guide and collimate a high density of MeV electrons  

Science Journals Connector (OSTI)

... energetic beams will revolutionize their applications. Here we report high-conductivity devices consisting of transient plasmas that increase the energy density of MeV electrons generated in laser–matter interactions by more ... MeV electrons generated in laser–matter interactions by more than one order of magnitude. A plasma fibre created on a hollow-cone target guides and collimates electrons in a manner akin ...

R. Kodama; Y. Sentoku; Z. L. Chen; G. R. Kumar; S. P. Hatchett; Y. Toyama; T. E. Cowan; R. R Freeman; J. Fuchs; Y. Izawa; M. H. Key; Y. Kitagawa; K. Kondo; T. Matsuoka; H. Nakamura; M. Nakatsutsumi; P. A. Norreys; T. Norimatsu; R. A. Snavely; R. B. Stephens; M. Tampo; K. A. Tanaka; T. Yabuuchi

2004-12-23T23:59:59.000Z

140

The low-energy nuclear density of states and the saddle point approximation  

E-Print Network [OSTI]

The nuclear density of states plays an important role in nuclear reactions. At high energies, above a few MeV, the nuclear density of states is well described by a formula that depends on the smooth single particle density of states at the Fermi surface, the nuclear shell correction and the pairing energy. In this paper we present an analysis of the low energy behaviour of the nuclear density of states using the saddle point approximation and extensions to it. Furthermore, we prescribe a simple parabolic form for excitation energy, in the low energy limit, which may facilitate an easy computation of level densities.

Sanjay K. Ghosh; Byron K. Jennings

2001-07-30T23:59:59.000Z

Note: This page contains sample records for the topic "mev cm-1 nuclear" 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

A Safer Nuclear Enterprise  

Science Journals Connector (OSTI)

...2012 at the Nuclear Security...leadership in nuclear enterprise...multinational assessment of emerging risks and consequences...to assess nuclear risks in...or nuclear terrorism. States...and nuclear power. Since 1945...nuclear power plant can mean...

Sidney D. Drell; George P. Shultz; Steven P. Andreasen

2012-06-08T23:59:59.000Z

142

Nuclear astrophysics  

SciTech Connect (OSTI)

The problem of core-collapse supernovae is used to illustrate the many connections between nuclear astrophysics and the problems nuclear physicists study in terrestrial laboratories. Efforts to better understand the collapse and mantle ejection are also motivated by a variety of interdisciplinary issues in nuclear, particle, and astrophysics, including galactic chemical evolution, neutrino masses and mixing, and stellar cooling by the emission of new particles. The current status of theory and observations is summarized.

Haxton, W.C.

1992-12-31T23:59:59.000Z

143

Nuclear astrophysics  

SciTech Connect (OSTI)

The problem of core-collapse supernovae is used to illustrate the many connections between nuclear astrophysics and the problems nuclear physicists study in terrestrial laboratories. Efforts to better understand the collapse and mantle ejection are also motivated by a variety of interdisciplinary issues in nuclear, particle, and astrophysics, including galactic chemical evolution, neutrino masses and mixing, and stellar cooling by the emission of new particles. The current status of theory and observations is summarized.

Haxton, W.C.

1992-01-01T23:59:59.000Z

144

Nuclear Counterterrorism  

Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]

The Order defines requirements for the protection of sensitive improvised nuclear device information and provides a framework to support DOE activities related to nuclear counterterrorism. (A supplemental DOE Manual, Control of and Access to Improvised Nuclear Device Information, provides requirements and procedures for protecting Sigma 20 information.) Appendices A and B are Official Use Only. Point of contact is Adam Boyd (NA-82), 202-586-0010. Cancels DOE O 457.1 and DOE M 457.1-1.

2013-08-26T23:59:59.000Z

145

Nuclear Power  

Science Journals Connector (OSTI)

Nuclear Power ... THIS WEEK’S issue contains six letters on nuclear power, a representative sample of the letters C&EN received in response to the editorial, “Resist Hysteria,” I wrote shortly after the earthquake and tsunami in Japan devastated the Fukushima Daiichi Nuclear Power Station (C&EN, March 21, page 5). ... Four of the six letters take sharp issue with the primary point I made in the editorial, which was that, despite the severity of the situation in Japan, nuclear power remains an essential component of our overall energy mix for the near to mid-term because it will help us avert the worst impacts of global climate disruption. ...

RUDY M. BAUM

2011-05-09T23:59:59.000Z

146

NUCLEAR STUDIES  

Science Journals Connector (OSTI)

Japanese nuclear power plant crisis sparks examination of U.S. REACTORS ... Calls are particularly zeroing in on reactors similar in location and design to those in Japan. ...

JEFF JOHNSON

2011-04-04T23:59:59.000Z

147

Nuclear radiation electronic gear  

Science Journals Connector (OSTI)

Nuclear radiation electronic gear ... Examines the line of nuclear radiation instrumentation offered by Nuclear-Chicago Corporation and Victoreen Instrument Company. ... Nuclear / Radiochemistry ...

S. Z. Lewin

1961-01-01T23:59:59.000Z

148

Nuclear Weapons Journal  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Nuclear Weapons Journal Nuclear Weapons Journal x The Nuclear Weapons Journal ceased publication after Issue 2, 2009. Below are Nuclear Weapons Journal archived issues. Issue 2,...

149

Nuclear Forces and Nuclear Systems  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Forces and Nuclear Systems Forces and Nuclear Systems Our goal is to achieve a description of nuclear systems ranging in size from the deuteron to nuclear matter and neutron stars using a single parameterization of the nuclear forces. Our work includes both the construction of two- and three-nucleon potentials and the development of many-body techniques for computing nuclear properties with these interactions. Detailed quantitative, computationally intense studies are essential parts of this work. In the last decade we have constructed several realistic two- and three-nucleon potential models. The NN potential, Argonne v18, has a dominant charge-independent piece plus additional charge-dependent and charge-symmetry-breaking terms, including a complete electromagnetic interaction. It fits 4301 pp and np elastic scattering data with a chi**2

150

Nuclear Systems Modeling, Simulation & Validation | Nuclear Science...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Research Areas Fuel Cycle Science & Technology Fusion Nuclear Science Isotope Development and Production Nuclear Security Science & Technology Nuclear Systems Modeling, Simulation...

151

Nuclear Materials Management & Safeguards System | National Nuclear...  

National Nuclear Security Administration (NNSA)

System Nuclear Materials Management & Safeguards System NMMSS U.S. Department of Energy U.S. Nuclear Regulatory Commission Nuclear Materials Management & Safeguards...

152

Nuclear options  

Science Journals Connector (OSTI)

... sad if transient commercial expediency led the country to take risks now by adopting nuclear reactor designs from abroad which are in some respects technically less sound than those produced at ... much lower priority. It can be anticipated, however; that although the types of nuclear reactor selected as the best that Britain could build next may be suitable for unit designs ...

G. R. Bainbridge

1974-06-21T23:59:59.000Z

153

Nuclear Reactor Materials and Fuels  

Science Journals Connector (OSTI)

Nuclear reactor materials and fuels can be classified into six categories: Nuclear fuel materials Nuclear clad materials Nuclear coolant materials Nuclear poison materials Nuclear moderator materials

Dr. James S. Tulenko

2012-01-01T23:59:59.000Z

154

(Nuclear theory). [Research in nuclear physics  

SciTech Connect (OSTI)

This report discusses research in nuclear physics. Topics covered in this paper are: symmetry principles; nuclear astrophysics; nuclear structure; quark-gluon plasma; quantum chromodynamics; symmetry breaking; nuclear deformation; and cold fusion. (LSP)

Haxton, W.

1990-01-01T23:59:59.000Z

155

Nuclear Astrophysics  

E-Print Network [OSTI]

Nuclear physics has a long and productive history of application to astrophysics which continues today. Advances in the accuracy and breadth of astrophysical data and theory drive the need for better experimental and theoretical understanding of the underlying nuclear physics. This paper will review some of the scenarios where nuclear physics plays an important role, including Big Bang Nucleosynthesis, neutrino production by our sun, nucleosynthesis in novae, the creation of elements heavier than iron, and neutron stars. Big-bang nucleosynthesis is concerned with the formation of elements with A nuclear physics inputs required are few-nucleon reaction cross sections. The nucleosynthesis of heavier elements involves a variety of proton-, alpha-, neutron-, and photon-induced reactions, coupled with radioactive decay. The advent of radioactive ion beam facilities has opened an important new avenue for studying these processes, as many involve radioactive species. Nuclear physics also plays an important role in neutron stars: both the nuclear equation of state and cooling processes involving neutrino emission play a very important role. Recent developments and also the interplay between nuclear physics and astrophysics will be highlighted.

Carl R. Brune

2005-02-28T23:59:59.000Z

156

LANSCE nuclear science facilities and activities  

SciTech Connect (OSTI)

Nuclear science activities at the Los Alamos Neutron Science Center (LANSCE) encompass measurements spanning the neutron energy range from thermal to 600 MeV. The neutron sources use spallation of the LANSCE 800 MeV pulsed proton beam with the time-of-flight technique to measure properties of neutron-induced reactions as a function of energy over this large energy range. Current experiments are conducted at the Lujan Center moderated neutron source, the unmoderated WNR target, and with a lead-slowing-down spectrometer. Instruments in use include the DANCE array of BaF{sub 2} scintillators for neutron capture studies, the FIGARO array of liquid scintillator neutron detectors, the GEANIE array of high-resolution HPGe x-ray and gamma-ray detectors, and a number of fission chambers, and other detectors. The LANL capabilities for production and handling of radioactive materials coupled with the neutron sources and detectors at LANSCE are enabling new and challenging measurements for a variety of applications including nuclear energy and nuclear astrophysics. An overview of recent research and examples of results is presented.

Nelson, Ronald O [Los Alamos National Laboratory

2010-01-01T23:59:59.000Z

157

nuclear security | National Nuclear Security Administration  

National Nuclear Security Administration (NNSA)

security | National Nuclear Security Administration People Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response Recapitalizing Our...

158

Nuclear Incident Team | National Nuclear Security Administration  

National Nuclear Security Administration (NNSA)

Incident Team | National Nuclear Security Administration People Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response Recapitalizing...

159

nuclear navy | National Nuclear Security Administration  

National Nuclear Security Administration (NNSA)

navy | National Nuclear Security Administration People Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response Recapitalizing Our...

160

nuclear threat science | National Nuclear Security Administration  

National Nuclear Security Administration (NNSA)

threat science | National Nuclear Security Administration People Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response Recapitalizing...

Note: This page contains sample records for the topic "mev cm-1 nuclear" 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

Nuclear Operations | National Nuclear Security Administration  

National Nuclear Security Administration (NNSA)

Nuclear Security Administration People Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response Recapitalizing Our Infrastructure...

162

Nuclear condensation  

Science Journals Connector (OSTI)

This work draws an analogy between a heated nucleus breaking up into clusters and a liquid undergoing a phase transition to a gas in which droplets appear. The critical temperature and density in the nucleus are investigated using a Skyrme effective interaction and finite temperature Hartree-Fock theory. The energy and pressure as a function of density are calculated. The effects of compressibility, effective mass, and binding energy per particle on the critical temperature and critical density of nuclear systems is developed. In some cases, analytic expressions for these quantities can be obtained.NUCLEAR REACTIONS Phase transitions in hot nuclear matter.

H. Jaqaman; A. Z. Mekjian; L. Zamick

1983-06-01T23:59:59.000Z

163

Nuclear War  

SciTech Connect (OSTI)

Several chapters in Last Aid warrant the attention of the medical profession. What is known and not known about acute biologic effects following a nuclear explosion is described. The social, physical, and environmental impact of nuclear war on urban population centers is described. How nuclear weapons could affect the composition of the ozone layer and the effects this could have on human survival, including possible interruption of the aquatic ecosystem to produce single-cell organisms for the food cycle, especially seafood is noted.

MacLeod, G.K.

1983-01-01T23:59:59.000Z

164

Latent heat of nuclear matter  

E-Print Network [OSTI]

We study the latent heat of the liquid-gas phase transition in symmetric nuclear matter using self-consistent mean-field calculations with a few Skyrme forces. The temperature dependence of the latent heat is rather independent of the mean-field parametrization and can be characterized by a few parameters. At low temperatures, the latent heat tends to the saturation energy. Near the critical point, the latent heat goes to zero with a well-determined mean-field critical exponent. A maximum value of the latent heat in the range l ~ 25-30 MeV is found at intermediate temperatures, which might have experimental relevance. All these features can be explained from very basic principles.

Arianna Carbone; Artur Polls; Arnau Rios; Isaac Vidaña

2010-12-10T23:59:59.000Z

165

Climate Change, Nuclear Power and Nuclear  

E-Print Network [OSTI]

Climate Change, Nuclear Power and Nuclear Proliferation: Magnitude Matters Rob Goldston MIT IAP biomass wind hydro coal CCS coal nat gas CCS nat gas nuclear Gen IV nuclear Gen III nuclear Gen II 5-1 Electricity Generation: CCS and Nuclear Power Technology Options Available Global Electricity Generation WRE

166

A phenomenological equation of state for isospin asymmetric nuclear matter  

E-Print Network [OSTI]

A phenomenological momentum-independent (MID) model is constructed to describe the equation of state (EOS) for isospin asymmetric nuclear matter, especially the density dependence of the nuclear symmetry energy $E_{\\text{\\textrm{sym}}}(\\rho)$. This model can reasonably describe the general properties of the EOS for symmetric nuclear matter and the symmetry energy predicted by both the sophisticated isospin and momentum dependent MDI model and the Skyrme-Hartree-Fock approach. We find that there exists a nicely linear correlation between $K_{\\mathrm{sym}}$ and $L$ as well as between $J_{0}/K_{0} $ and $K_{0}$, where $L$ and $K_{\\mathrm{sym}}$ represent, respectively, the slope and curvature parameters of the symmetry energy at the normal nuclear density $\\rho_{0}$ while $K_{0}$ and $J_{0}$ are, respectively, the incompressibility and the third-order derivative parameter of symmetric nuclear matter at $\\rho_{0}$. These correlations together with the empirical constraints on $K_{0}$, $L$ and $E_{\\text{\\textrm{sym}}}(\\rho_{0}) $ lead to an estimation of -477 MeV $\\leq K_{\\mathrm{sat,2}}\\leq -241 $ MeV for the second-order isospin asymmetry expansion coefficient for the incompressibility of asymmetric nuclear matter at the saturation point.

Lie-Wen Chen

2009-10-01T23:59:59.000Z

167

Nuclear Medicine  

Science Journals Connector (OSTI)

Nuclear medicine is the branch of medicine that is concerned with the use of in the diagnosis, management, and treatment of disease. It usually uses small amounts of radioactive materials or , substances th...

2008-01-01T23:59:59.000Z

168

Nuclear viscosity  

Science Journals Connector (OSTI)

The decay rate of momentum in a nuclear reaction is given by an exact formula expressed in terms of the T matrix. A special case, where a viscosity coefficient can be estimated, is considered.

B. Giraud; J. Le Tourneux; E. Osnes

1975-01-01T23:59:59.000Z

169

Nuclear Waste  

Science Journals Connector (OSTI)

Nuclear waste is radioactive material no longer considered valuable...238U, 235U, and 226Ra (where the latter decays to 222Rn gas by emitting an alpha particle) or formed through fission of fissile radioisotopes ...

Rob P. Rechard

2014-01-01T23:59:59.000Z

170

Nuclear Golf  

E-Print Network [OSTI]

Broadcast Transcript: Pay no attention to that nuclear warhead behind the 18th hole; just shout "Fore!" and drive your Titleist down the fairway. In a development that is bizarre even by North Korean standards, the country ...

Hacker, Randi; Tsutsui, William

2006-12-06T23:59:59.000Z

171

Nuclear Fuels  

Science Journals Connector (OSTI)

The core of a nuclear reactor is composed of a controlled critical configuration of a fissile material, which in strict a sense is the fuel. This fissile material is contained in a matrix, normally a ceramic c...

Rudy J. M. Konings; Thierry Wiss…

2011-01-01T23:59:59.000Z

172

Nuclear Energy!  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

driver, see the Nuclear Clean Air Energy race car and receive a special clean energy patch on October 21 from 6:30 - 7:30 p.m. Space is limited RSVP by October 4 Hands-on...

173

Nuclear forces  

SciTech Connect (OSTI)

These lectures present an introduction into the theory of nuclear forces. We focus mainly on the modern approach, in which the forces between nucleons emerge from low-energy QCD via chiral effective field theory.

Machleidt, R. [Department of Physics, University of Idaho, Moscow, Idaho 83844 (United States)

2013-06-10T23:59:59.000Z

174

Calculation of excitation function of some structural fusion material for (n,p) reactions up to 25 MeV  

E-Print Network [OSTI]

Fusion serves an inexhaustible energy for humankind. Although there have been significant research and development studies on the inertial and magnetic fusion reactor technology, Furthermore, there are not radioactive nuclear waste problems in the fusion reactors. In this study, (n, p) reactions for some structural fusion materials such as 27Al, 51V, 52Cr, 55Mn and 56Fe have been investigated. The new calculations on the excitation functions of 27 Al(n,p) 27 Mg, 51 V(n,p) 51 Ti, 52 Cr(n,p) 52 V, 55 Mn(n,p) 55 Cr and 56 Fe(n,p) 56 Mn reactions have been carried out up to 30 MeV incident neutron energy. Statistical model calculations, based on the Hauser-Feshbach formalism, have been carried out using the TALYS-1.0 and were compared with available experimental data in the literature and with ENDF/B-VII, T=300k; JENDL-3.3, T=300k and JEFF3.1, T=300k evaluated libraries .

Tarik Siddik

2013-03-15T23:59:59.000Z

175

Photo-Disintegration of Deuterium by 4.5 to 20.3 Mev X-Rays  

Science Journals Connector (OSTI)

A study is made of the angular distributions and the distribution in energy of the photo-protons arising from the photo-disintegration of deuterium by the continuous x-ray spectrum produced when electrons accelerated in the betatron to a kinetic energy of 20.3 Mev impinged on a 0.005 in. Pt target. The collimated x-ray beam passed through a deuterium gas-filled reaction chamber in which nuclear emulsions were placed to detect the resulting photo-protons. The angular distributions for six photon energy intervals are consistent with a differential cross section in the center of mass system of the form: ?(?)?a+sin2?(1+?cos?). Assuming an intensity spectrum for the betatron radiation of the shape determined by Koch and Carter a curve for the relative cross section for the photo-disintegration of deuterium as a function photon energy was determined. This curve falls off more slowly than does the Bethe-Peierls expression. The discrepancy, however, is within the experimental errors and the uncertainties in the spectrum of the betatron radiation.

E. G. Fuller

1950-07-15T23:59:59.000Z

176

Calculation of excitation function of some structural fusion material for (n,p) reactions up to 25 MeV  

E-Print Network [OSTI]

Fusion serves an inexhaustible energy for humankind. Although there have been significant research and development studies on the inertial and magnetic fusion reactor technology, Furthermore, there are not radioactive nuclear waste problems in the fusion reactors. In this study, (n, p) reactions for some structural fusion materials such as 27Al, 51V, 52Cr, 55Mn and 56Fe have been investigated. The new calculations on the excitation functions of 27 Al(n,p) 27 Mg, 51 V(n,p) 51 Ti, 52 Cr(n,p) 52 V, 55 Mn(n,p) 55 Cr and 56 Fe(n,p) 56 Mn reactions have been carried out up to 30 MeV incident neutron energy. Statistical model calculations, based on the Hauser-Feshbach formalism, have been carried out using the TALYS-1.0 and were compared with available experimental data in the literature and with ENDF/B-VII, T=300k; JENDL-3.3, T=300k and JEFF3.1, T=300k evaluated libraries .

Siddik, Tarik

2013-01-01T23:59:59.000Z

177

Emission patterns of neutral pions in 40A MeV Ta+Au reactions  

Science Journals Connector (OSTI)

Differential cross sections of neutral pions emitted in Ta181+Au197 collisions at a beam energy of 39.5A MeV have been measured with the two-arm photon spectrometer (TAPS). The kinetic energy and transverse momentum spectra of neutral pions cannot be properly described in the framework of the thermal model, nor when the reabsorption of pions is accounted for in a phenomenological model. However, high energy and high momentum tails of the pion spectra can be well fitted through thermal distributions with unexpectedly soft temperature parameters below 10 MeV.

K. Piasecki; T. Matulewicz; N. Yahlali; H. Delagrange; J. Díaz; D. G. d’Enterria; F. Fernández; A. Kugler; H. Löhner; G. Martínez-García; R. W. Ostendorf; Y. Schutz; P. Tlustý; R. Turrisi; V. Wagner; H. W. Wilschut (TAPS Collaboration)

2010-05-28T23:59:59.000Z

178

Collective motion in selected central collisions of Au on Au at 150A MeV  

Science Journals Connector (OSTI)

Using the FOPI facility at GSI Darmstadt complete data of Au on Au collisions at 150A MeV were collected for charged products (Z=1–15) at laboratory angles 1°??lab?30°. Central collisions were selected by applying various criteria. The kinetic energy spectra of fragments from an isolated midrapidity source are investigated in detail for center-of-mass angles 25°??c.m.?45°. The heavy products (Z?3) are used to determine the collective energy which is found to be at least 10A MeV.

S. C. Jeong et al.

1994-05-30T23:59:59.000Z

179

Comment on the Evidence for a Monopole Resonance at Approximately 20 Mev in Ni-58  

E-Print Network [OSTI]

be accompanied by a brief abstract and a keyword abstract. Comment on the evidence for a monopole resonance at approximately 20 MeV in 5sNi U. Garg, P. Bogucki, J. D. Bronson, Y. -W. Lui, C. M. Rozsa, * and D. H. Youngblood Cyclotron Institute, Texas AckM... Uniuersity, College Station, Texas 77843 (Received 23 September 1981) Small-angle inelastic a scattering data for "Ni at 129 MeV have been reanalyzed with the giant resonance peak parameters suggested by Bertrand et al. The two components of the giant...

Garg, U.; Bogucki, P.; Bronson, J. D.; Lui, YW; Rozsa, C. M.; Youngblood, David H.

1982-01-01T23:59:59.000Z

180

Ground state proton capture reactions from 20 to 100 MeV  

Science Journals Connector (OSTI)

Proton capture reactions on targets of B11, C12, N15, O16, and Al27 were measured from Ep=20 to 100 MeV. The energy dependence of the ??=60° differential cross sections are presented for captures populating the ground states of C12, N13, O16, F17, and Si28. Differential-cross-section and analyzing-power angular distributions are presented at bombarding energies of Ep=20.8, 28.35, 49.2, and 49.69 MeV. Calculations from two capture-reaction models are compared to the data.

H. J. Hausman; S. L. Blatt; T. R. Donoghue; J. Kalen; W. Kim; D. G. Marchlenski; T. W. Rackers; P. Schmalbrock; M. A. Kovash; A. D. Bacher

1988-02-01T23:59:59.000Z

Note: This page contains sample records for the topic "mev cm-1 nuclear" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

Transmission and Backscattering of 4.0- to 12.0-MeV Electrons  

Science Journals Connector (OSTI)

Transmission and backscattering coefficients were measured for 4.0- to 12.0-MeV monoenergetic electrons normally incident on solid targets of C, Al, Cu, Ag, Ta, and U. Transmitted and backscattered electrons were collected by biased Faraday cups, each subtending ?90% of 2? sr. Number transmission coefficients at 10 MeV agree with Berger and Seltzer's Monte Carlo results, and saturation backscattering coefficients generally agree with Tabata's results to within ±10%. Empirical formulas for determining the extrapolated range and both the transmission and backscattering coefficients as a function of Z, energy, and thickness have been developed.

P. J. Ebert, A. F. Lauzon, and E. M. Lent

1969-07-10T23:59:59.000Z

182

Chronic cellular responses of rat skin to 13 Mev proton irradiation  

E-Print Network [OSTI]

CHRONIC CELLULAR RESPONSES OF RAT SKIN TO 13 MEV PROTON IRRADIATION A Thesis by DONALD KING HINKLE, D. V. M. Submitted to the Graduate College of the Texas AErM University in partial fulfillment of the requirements for the degree of MASTER... OF SCIENCE August 1966 Major Subject: Laboratory Animal Medicine CHRONIC CELLULAR RESPONSES OF RAT SKIN TO 13 MEV PROTON IRRADIATION A Thesis by DONALD KING HINKLE, D. V. M. Submitted to the Graduate College of the Texas ARM University in partial...

Hinkle, Donald King

2012-06-07T23:59:59.000Z

183

Nuclear Physics for Nuclear Fusion  

SciTech Connect (OSTI)

The nuclear fusion data for deuteron-triton resonance near 100 keV are found to be consistent with the selective resonant tunneling model. The feature of this selective resonant tunneling is the selectivity. It selects not only the energy level, but also the damping rate (nuclear reaction rate). When the Coulomb barrier is thin and low, the resonance selects the fast reaction channel; however, when the Coulomb barrier is thick and high, the resonance selects the slow reaction channel. This mechanism might open an approach toward fusion energy with no strong nuclear radiation.

Li Xingzhong [Tsinghua University (China)

2002-01-15T23:59:59.000Z

184

Nuclear orientation studies of Am241 and Fm255  

Science Journals Connector (OSTI)

Nuclei of Am241 and Fm255 were oriented in single crystals of neodymium ethylsulfate at temperatures down to 11 mK. Orientation was detected by ?-particle angular distributions. The temperature dependences of these distributions were consistent with the lowest electronic states of these two actinide ions in the ethylsulfate lattice being similar to those of the corresponding lanthanide ions. Thus quadrupole orientation was observed in Am3+ (5f6), as in Eu3+ (4f6). In Fm3+ (5f11) the orientation was magnetic and equatorial (|B|>|A|), as would be expected from the hyperfine interaction in Er3+ (4f11). For Am241 we report P=-0.0033(6) cm-1, and for Fm255, |B|=0.035(7) cm-1. The Am3+ data are consistent with an antishielding constant of ???-102, in good agreement with theory, and a shielding factor ?2=0.7, similar to the value for Eu3+. The nuclear results showed that the s and d ?-particle partial waves are in phase for the favored ?-decay branch in each case. The relative phase of the g wave could not be determined.RADIOACTIVITY Am241, Fm255; measured W(?,1T), nuclear orientation; deduced hyperfine coupling constants, ? partial wave phases.

A. J. Soinski and D. A. Shirley

1974-10-01T23:59:59.000Z

185

Countering Nuclear Terrorism | National Nuclear Security Administration  

National Nuclear Security Administration (NNSA)

Countering Nuclear Terrorism | National Nuclear Security Administration Countering Nuclear Terrorism | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response Recapitalizing Our Infrastructure Continuing Management Reform Countering Nuclear Terrorism About Us Our Programs Our History Who We Are Our Leadership Our Locations Budget Our Operations Media Room Congressional Testimony Fact Sheets Newsletters Press Releases Speeches Events Social Media Video Gallery Photo Gallery NNSA Archive Federal Employment Apply for Our Jobs Our Jobs Working at NNSA Blog The National Nuclear Security Administration Countering Nuclear Terrorism Home > Our Mission > Countering Nuclear Terrorism Countering Nuclear Terrorism NNSA provides expertise, practical tools, and technically informed policy

186

Time scale of the fission process in the reaction 50A MeV 20Ne + 165Ho  

E-Print Network [OSTI]

system of mass 178 amu and excitation energy of 580 MeV that the fission time is [ ] 1 x 10-20 s regardless of the asymmetry....

Mdeiwayeh, Nader

2012-06-07T23:59:59.000Z

187

Characterisation of a MeV Bremsstrahlung x-ray source produced from a high intensity laser for high areal density object radiography  

SciTech Connect (OSTI)

Results of an experiment to characterise a MeV Bremsstrahlung x-ray emission created by a short (<10 ps) pulse, high intensity (1.4 × 10{sup 19} W/cm{sup 2}) laser are presented. X-ray emission is characterized using several diagnostics; nuclear activation measurements, a calibrated hard x-ray spectrometer, and dosimeters. Results from the reconstructed x-ray energy spectra are consistent with numerical simulations using the PIC and Monte Carlo codes between 0.3 and 30 MeV. The intense Bremsstrahlung x-ray source is used to radiograph an image quality indicator (IQI) heavily filtered with thick tungsten absorbers. Observations suggest that internal features of the IQI can be resolved up to an external areal density of 85 g/cm{sup 2}. The x-ray source size, inferred by the radiography of a thick resolution grid, is estimated to be approximately 400 ?m (full width half maximum of the x-ray source Point Spread Function)

Courtois, C.; Compant La Fontaine, A.; Bazzoli, S.; Bourgade, J. L.; Gazave, J.; Lagrange, J. M.; Landoas, O.; Dain, L. Le; Pichoff, N. [CEA, DAM, DIF, F-91297 Arpajon (France)] [CEA, DAM, DIF, F-91297 Arpajon (France); Edwards, R.; Aedy, C. [AWE Plc., Aldermaston, Reading RG7 4PR (United Kingdom)] [AWE Plc., Aldermaston, Reading RG7 4PR (United Kingdom); Mastrosimone, D.; Pien, G.; Stoeckl, C. [Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623 (United States)] [Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623 (United States)

2013-08-15T23:59:59.000Z

188

Reaction Na23(?,p)Mg26 from E?=2.3-3.7 MeV and the corresponding thermonuclear reaction rate  

Science Journals Connector (OSTI)

Integrated excitation functions for the reactions Na23(?,p0)Mg26 and Na23(?,p1)Mg*26 were measured over the energy range E?=2.3-3.7 MeV. Absolute resonance strengths were determined for 30 new p1 resonances and 9 new p0 resonances. The corresponding stellar reaction rate NA is recalculated and found to be enhanced by a factor of 3 at T9=2 and by a factor of 4 at T9=3. A multiparameter analytic fit to the new NA as a function of temperature over the range T9=0.3-5.0 is given. The enhanced rate was incorporated in a nucleosynthesis code and the resulting change in Na23 and Mg26 abundances at selected temperatures is discussed.[NUCLEAR REACTIONS Na23(?,p), E=2.3-3.7 MeV; measured excitation function and deduced resonant strengths for p0 and p1 proton groups; NaCl target. Calculated new thermonuclear reaction rate.

Daniel P. Whitmire and Cary N. Davids

1974-03-01T23:59:59.000Z

189

524 IEEE Transactionson Nuclear Science, Vol. 35, No. 1, February 1988 BACKGROUND EVENTS IN MICROCHANNEL PLATES  

E-Print Network [OSTI]

524 IEEE Transactionson Nuclear Science, Vol. 35, No. 1, February 1988 BACKGROUND EVENTS of the MCP's are found to have no significant effect on the background rate. Detection of 1.46 MeV y rays the environmental or operating conditions must be used to investigate the behavior of the intrinsic MCP background

Wargelin, Bradford J.

190

Quantum Kinetics of Deconfinement Transitions in Dense Nuclear Matter: Dissipation Effects at Low Temperatures  

Science Journals Connector (OSTI)

......nuclear matter of temperature ;S 0.1 MeV, as found in a neutron star core, if it occurs dynamically, is likely to pro- ceed via quantum nucleation, although no definite conclusion can be drawn in the absence of the exact information about ex and......

Kei Iida

1997-09-01T23:59:59.000Z

191

Neutron Inelastic Cross-Sections between 55 and 140 MeV  

Science Journals Connector (OSTI)

10 July 1956 research-article Neutron Inelastic Cross-Sections between 55 and 140 MeV R. G. P. Voss R. Wilson The neutron inelastic cross-sections for lead, cadmium, copper, aluminium and carbon have been measured at 140, 105, 81...

1956-01-01T23:59:59.000Z

192

41.67 MeV ??Br charge change cross sections in argon  

E-Print Network [OSTI]

to accelerate 7BBr ions. 48 Schematic diagram of position sensitive detector used to detect the 798r ions . . 49 Block diagram of the electronics used to eliminate the energy dependence of the spectrum 50 Spectrum of deflections for 41. 67 MeV Br ions...

Harrison, James Freeman

2012-06-07T23:59:59.000Z

193

Quasi-Differential Neutron Scattering in Zirconium from 0.5 to 20 MeV  

E-Print Network [OSTI]

Quasi-Differential Neutron Scattering in Zirconium from 0.5 to 20 MeV D. P. Barry,* G. Leinweber, R-3590 Received January 10, 2012 Accepted August 10, 2012 Abstract ­ High-energy-neutron-scattering experiments of the neu- tron scattering cross sections for zirconium. The neutron differential scattering cross

Danon, Yaron

194

DESIGN FOR A 1.3 MW, 13 MEV BEAM DUMP FOR AN ENERGY RECOVERY LINAC*  

E-Print Network [OSTI]

DESIGN FOR A 1.3 MW, 13 MEV BEAM DUMP FOR AN ENERGY RECOVERY LINAC* Colin H. Smith+ , Yun He an Energy Recovery Linac (ERL) is dumped at an energy close to the injection energy. This energy is chosen to be as low as possible consistent with meeting the beam quality specifications. ERLs operate with high

195

Giant resonances in (24)Mg and (28)Si from 240 MeV (6)Li scattering  

E-Print Network [OSTI]

Elastic and inelastic scattering of 240 MeV (6)Li particles from (24)Mg and (28)Si were measured with the MDM spectrometer. Optical potential parameters for (6)Li+(24)Mg and (6)Li+(28)Si scattering systems were obtained by fitting elastic scattering...

Chen, X.; Lui, Y. -W; Clark, H. L.; Tokimoto, Y.; Youngblood, David H.

2009-01-01T23:59:59.000Z

196

Nuclear Induction  

Science Journals Connector (OSTI)

The magnetic moments of nuclei in normal matter will result in a nuclear paramagnetic polarization upon establishment of equilibrium in a constant magnetic field. It is shown that a radiofrequency field at right angles to the constant field causes a forced precession of the total polarization around the constant field with decreasing latitude as the Larmor frequency approaches adiabatically the frequency of the r-f field. Thus there results a component of the nuclear polarization at right angles to both the constant and the r-f field and it is shown that under normal laboratory conditions this component can induce observable voltages. In Section 3 we discuss this nuclear induction, considering the effect of external fields only, while in Section 4 those modifications are described which originate from internal fields and finite relaxation times.

F. Bloch

1946-10-01T23:59:59.000Z

197

Collaborating Organizations - Nuclear Data Program, Nuclear Engineering  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Collaborating Organizations Collaborating Organizations Nuclear Data Program Overview Current Projects & Recent Activities Collaborating Organizations Publications Nuclear Data Measurements (NDM) Reports Experimental Nuclear Data Resources Contact ND Program Related Resources Other Major Programs Work with Argonne Contact us For Employees Site Map Help Join us on Facebook Follow us on Twitter NE Division on Flickr Nuclear Data Program Collaborating Organizations Bookmark and Share National Nuclear Data Center, Brookhaven National Laboratory, Upton, New York. International Nuclear Structure and Decay Data Network, coordinated by IAEA, Vienna, Austria Heavy-Ion Nuclear Physics Group, Physics Division, Argonne National Laboratory, Argonne, Illinois. Nuclear Spectroscopy Group, Department of Nuclear Physics,

198

Nuclear Data Program - Nuclear Engineering Division (Argonne)  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Data Program Data Program Nuclear Data Program Overview Current Projects & Recent Activities Collaborating Organizations Publications Nuclear Data Measurements (NDM) Reports Experimental Nuclear Data Resources Contact ND Program Related Resources Other Major Programs Work with Argonne Contact us For Employees Site Map Help Join us on Facebook Follow us on Twitter NE Division on Flickr Nuclear Data Program We contribute to the development of comprehensive nuclear reactions and nuclear structure databases, including nuclear data measurement, analysis, modeling and evaluation methodologies, that are implemented in basic science research and advanced nuclear technologies. Bookmark and Share Recent Events Nuclear Structure 2012 Conference Argonne National Laboratory hosted the

199

Measurement and analysis of gamma-rays emitted from spent nuclear fuel above 3 MeV  

SciTech Connect (OSTI)

The Next Generation Safeguard Initiative (NGSI) includes an effort to determine the mass content of fissile isotopes contained within spent fuel through the spectroscopy of high-energy delayed gamma rays. Studies being performed indicate the primary difficulty is the ability to detect the desired signal in the presence of the intense background associated with spent fuel fission products. An enabling technology for this application is high-resolution high-purity germanium (HPGe) detectors capable of operating efficiently in at extremely high count rates. This presentation will describe the prospects of high-rate germanium detectors and delayed-gamma techniques, primarily discussing the efforts to merge these into a unique and viable system for measuring spent fuel.

Rodriguez, Douglas C. [Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); Anderson, Elaina R. [Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); State Univ. of New York at Stony Brook, NY (United States); Anderson, Kevin K. [Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); Campbell, Luke W. [Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); Fast, James E. [Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); Jarman, Kenneth D. [Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); Kulisek, Jonathan A. [Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); Orton, Christopher R. [Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); Runkle, Robert C. [Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); Stave, Sean [Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

2013-08-28T23:59:59.000Z

200

Nuclear Science & Technology  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Nuclear Science & Technology Nuclear Science & Technology Nuclear Science & Technology1354608000000Nuclear Science & TechnologySome of these resources are LANL-only and will require Remote Access. /No/ Nuclear Science & Technology Some of these resources are LANL-only and will require Remote Access. Key Resources Databases Organizations Journals Key Resources International Atomic Energy Agency IAEA scientific and technical publications cover areas of nuclear power, radiation therapy, nuclear security, nuclear law, and emergency repose. Search under Publications/Books and Reports for scientific books, standards, technical guides and reports National Nuclear Data Center Nuclear physics data for basic nuclear research and for applied nuclear technologies, operated by Brookhaven.

Note: This page contains sample records for the topic "mev cm-1 nuclear" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

NUCLEAR PROXIMITY FORCES  

E-Print Network [OSTI]

One might summarize of nuclear potential energy has beendegree of freedom) for the nuclear interaction between anyUniversity of California. Nuclear Proximity Forces 'I< at

Randrup, J.

2011-01-01T23:59:59.000Z

202

Nuclear Nonproliferation Programs | ORNL  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Nuclear Nonproliferation Programs SHARE Nuclear Nonproliferation Programs image Oak Ridge National Laboratory covers the entire spectrum of nuclear nonproliferation work, from...

203

Nuclear diffuseness as a degree of freedom  

Science Journals Connector (OSTI)

The response of the nuclear energy to changes in neutron and proton surface diffusenesses is investigated using the Thomas-Fermi model. Algebraic expressions are provided for the energy cost of changing the two diffusenesses away from their equilibrium values. This will make it possible to generalize the macroscopic-microscopic calculations of nuclear masses and deformation energies by the inclusion of the neutron and proton diffusenesses as degrees of freedom (to be varied along with the shape degrees of freedom). One result, which is suggested by the relatively low cost in macroscopic energy of increasing the diffuseness of a heavy nucleus by 10% (about 4 MeV), is that superheavy nuclei near Z=126,?N=184 may have a fair chance of becoming stabilized by shell effects. An appendix introduces an improved measure of surface diffuseness, with certain advantages over the conventional Süssmann width b.

W. D. Myers and W. J. ?wia?tecki

1998-12-01T23:59:59.000Z

204

Nuclear Data | More Science | ORNL  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Nuclear Data SHARE Nuclear Data Nuclear Data ORNL is a recognized, international leader in nuclear data research and development (R&D) to support nuclear applications analyses. For...

205

Nuclear Facilities | Department of Energy  

Energy Savers [EERE]

Nuclear Facilities Nuclear Facilities Nuclear Facilities Locator Map Numerical map data points indicate two or more nuclear facilities in the same geographic location. Nuclear...

206

Generation of 9 MeV -rays by all-laser-driven Compton scattering with second-harmonic laser light  

E-Print Network [OSTI]

Generation of 9 MeV -rays by all-laser-driven Compton scattering with second-harmonic laser light dura- tions (femtosecond). Pulses of -rays, electrons, and laser light are also well synchronized); published July 7, 2014 Gamma-ray photons with energy >9 MeV were produced when second

Umstadter, Donald

207

Calibration of a long counter for fast neutrons with energies from 2 to 14 MeV  

E-Print Network [OSTI]

To determine if a Hansen and McKibben type shielded long counter has a flat response from 2 MeV to 14 Mev detector efficiency was experimentally measured using a PuBe source. Calculations using the Monte Carlo program, MCNP, were performed...

Orr, Michael Lee

2012-06-07T23:59:59.000Z

208

Nuclear “waffles”  

Science Journals Connector (OSTI)

Background: The dense neutron-rich matter found in supernovae and inside neutron stars is expected to form complex nonuniform phases, often referred to as nuclear pasta. The pasta shapes depend on density, temperature and proton fraction and determine many transport properties in supernovae and neutron star crusts.

A. S. Schneider; D. K. Berry; C. M. Briggs; M. E. Caplan; C. J. Horowitz

2014-11-24T23:59:59.000Z

209

Nuclear cheap?  

Science Journals Connector (OSTI)

... account of the fact that if there had been no nuclear contribution the additional fossil fuel supplies would have had to come from expanded output at the marginal and most expensive ... a perfectly proper accountancy basis, including allowance for costs yet to be incurred, the price we would be paying for electricity would be higher now had fossil stations been preferred ...

P.M.S. JONES

1980-12-18T23:59:59.000Z

210

Nuclear electricity  

Science Journals Connector (OSTI)

... p.344-6) and referred to in my letter of 23 October. The retail price index (RPI) has been used to correct for inflation and a uniform interest rate ... as given by historic costs, and if a previously unconsidered effect of inflation on nuclear fuel costs is included, the margin becomes 34 per cent above that for coal.

J.W. JEFFERY

1981-08-27T23:59:59.000Z

211

Neutrino nuclear response and photo nuclear reaction  

E-Print Network [OSTI]

Photo nuclear reactions are shown to be used for studying neutrino/weak nuclear responses involved in astro-neutrino nuclear interactions and double beta decays. Charged current weak responses for ground and excited states are studied by using photo nuclear reactions through isobaric analog states of those states, while neutral current weak responses for excited states are studied by using photo nuclear reactions through the excited states. The weak interaction strengths are studied by measuring the cross sections of the photo nuclear reactions, and the spin and parity of the state are studied by measuring angular correlations of particles emitted from the photo nuclear reactions. Medium-energy polarized photons obtained from laser photons scattered off GeV electrons are very useful. Nuclear responses studied by photo nuclear reactions are used to evaluate neutrino/weak nuclear responses, i.e. nuclear beta and double beta matrix elements and neutrino nuclear interactions, and to verify theoretical calculations for them.

H. Ejiri; A. I. Titov; M. Boswell; A. Young

2013-11-10T23:59:59.000Z

212

Nuclear Medicine CT Angiography  

E-Print Network [OSTI]

Nuclear Medicine CT Angiography Stress Testing Rotation The Nuclear Medicine/CT angiography. Understand the indications for exercise treadmill testing and specific nuclear cardiology tests, safe use Level 2 proficiency in performing and interpreting cardiac nuclear imaging tests. Progression

Ford, James

213

Nuclear Forensics | National Nuclear Security Administration  

National Nuclear Security Administration (NNSA)

Forensics | National Nuclear Security Administration Forensics | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response Recapitalizing Our Infrastructure Continuing Management Reform Countering Nuclear Terrorism About Us Our Programs Our History Who We Are Our Leadership Our Locations Budget Our Operations Media Room Congressional Testimony Fact Sheets Newsletters Press Releases Speeches Events Social Media Video Gallery Photo Gallery NNSA Archive Federal Employment Apply for Our Jobs Our Jobs Working at NNSA Blog Nuclear Forensics Home > About Us > Our Programs > Emergency Response > Responding to Emergencies > Nuclear Forensics Nuclear Forensics Forensics Operations The National Technical Nuclear Forensics (NTNF) program is a Homeland Security Council and National Security

214

Nuclear structure and nuclear reactions | Argonne Leadership...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

the production Automatic Dynamic Load Balancing (ADLB) library on the BGP. Steve Pieper, Argonne National Laboratory Nuclear structure and nuclear reactions PI Name: James Vary PI...

215

Audit Report National Nuclear Security Administration Nuclear...  

Broader source: Energy.gov (indexed) [DOE]

National Nuclear Security Administration Nuclear Weapons Systems Configuration Management DOEIG-0902 March 2014 U.S. Department of Energy Office of Inspector General Office of...

216

Nuclear Resonance Fluorescence for Nuclear Materials Assay  

E-Print Network [OSTI]

to learn MCNPX and nuclear safeguards, Bill B. , Steve K. ,Introduction 1.1 Nuclear Safeguards . . . . . . . . . . . .Programme to IAEA Safeguards. STUK-YTO-TR 170. Helsinki

Quiter, Brian Joseph

2010-01-01T23:59:59.000Z

217

Civilian Nuclear Programs  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Civilian Nuclear Programs Civilian Nuclear Programs Civilian Nuclear Programs Los Alamos is committed to using its advanced nuclear expertise and unique facilities to meet the civilian nuclear national security demands of the future. CONTACT US Program Director Bruce Robinson (505) 667-1910 Email Los Alamos partners extensively with other laboratories, universities, industry, and the international nuclear community to address real-world technical challenges The Civilian Nuclear Programs Office is the focal point for nuclear energy research and development and next-generation repository science at Los Alamos National Laboratory. The Civilian Nuclear Programs Office manages projects funded by the Department of Energy's offices of Nuclear Energy Environmental Management Nuclear Regulatory Commission

218

Theory of nuclear reactions  

SciTech Connect (OSTI)

The book presents a theory of nuclear reaction. An account is given of the nonrelativistic nuclear reaction theory. The R - matrix description of nuclear reactions is considered and the dispersion method is formulated. Mechanisms of nuclear reactions and their relationship are studied in detail. Attention is paid to nuclear reactions involving the compound nuclear formation and to direct nuclear processes. The optical model the diffraction approach and high - energy diffraction nuclear processes involving composite particles are discussed.

Sitenko, A.G.

1990-01-01T23:59:59.000Z

219

Distribution of products in the reaction /sup 20/Ne + Al. [118 and 167 MeV  

SciTech Connect (OSTI)

The measurement and preliminary analysis of the distribution of products with Z between 2 and 21 and A between 3 and 43 from 118- and 167-MeV reactions of /sup 20/Ne with Al are reported. Experimental conditions were adequate to allow resolution of individual isotopes over this entire range, and measurements were made at several angles for each bombarding energy. Measured relative cross sections of the heavier products were compared with predictions of a statistical-model evaporation calculation. The overall agreement between experiment and theory was rather good; however, certain discrepancies between calculation and experiment for low Z and A at 167 MeV may be troublesome. 3 figures. (RWR)

Ferguson, R.L.; Gavron, A.I.; Obenshain, F.E.; Plasil, F.; Robinson, R.L.; Shapira, D.; Snell, A.H.; Young, G.R.

1980-01-01T23:59:59.000Z

220

Commissioning of the CERN LINAC4 BPM System with 50 Mev Proton Beamns  

E-Print Network [OSTI]

The new Linac4 at CERN will provide a 160 MeV H- ion beam for charge-exchange injection into the existing CERN accelerator complex. Shorted stripline pick-ups placed in the Linac intertank regions and the transfer lines will measure beam orbit, relative beam current, beam phase, and average beam energy via the time-of-flight between two pickups. A prototype Beam Position Monitor (BPM) system has been installed in the transfer line between the existing Linac2 and the Proton Synchrotron Booster (PSB) in order to study and review the complete acquisition chain. This paper presents measurements and performance of this BPM system operating with 50 MeV proton beams, and compares the results with laboratory measurements and electromagnetic simulations.

Tan, J; Søby, L; Sordet, M; Wendt, M

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "mev cm-1 nuclear" 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

KORONA; An intense sealed-tube 14-MeV neutron generator  

SciTech Connect (OSTI)

This paper describes a sealed-tube, high-current, low-energy accelerator (190 kV, 150 mA) in operation at the GKSS Research Center since 1981. The deuterium-tritium reaction yields a total source strength of 3 {times} 10 {sup 12} n/s. The neutron flux in the center of the hollow cylinder target is {approx} 3 {times} 10 n/cm{sup 2} {center dot} s in a 4-cm{sup 3} volume. Numerous 14-MeV neutron reaction cross sections have been determined with satisfactory accuracy; however, the system has been mainly used for neutron activation analysis. To predict the gamma-ray activity of any element after short-term irradiation with 14-MeV neutrons, a sensitivity study was performed, which proved to be a useful tool for analyzing complex spectra.

Pepelnik, R.; Fanger, H.U.; Michaelis, W. (GKSS-Forschungszentrum Geesthacht GmbH, Inst. fur Physik, Postfach 1160, D-2054 Geesthacht (DE))

1990-11-01T23:59:59.000Z

222

Transverse Beam Emittance Measurements of a 16 MeV Linac at the Idaho Accelerator Center  

SciTech Connect (OSTI)

A beam emittance measurement of the 16 MeV S-band High Repetition Rate Linac (HRRL) was performed at Idaho State University's Idaho Accelerator Center (IAC). The HRRL linac structure was upgraded beyond the capabilities of a typical medical linac so it can achieve a repetition rate of 1 kHz. Measurements of the HRRL transverse beam emittance are underway that will be used to optimize the production of positrons using HRRL's intense electron beam on a tungsten converter. In this paper, we describe a beam imaging system using on an OTR screen and a digital CCD camera, a MATLAB tool to extract beamsize and emittance, detailed measurement procedures, and the measured transverse emittances for an arbitrary beam energy of 15 MeV.

S. Setiniyaz, T.A. Forest, K. Chouffani, Y. Kim, A. Freyberger

2012-07-01T23:59:59.000Z

223

Optical Structure near 20 meV in Valence-Fluctuation Compounds  

Science Journals Connector (OSTI)

The first measurement is reported of low-energy (20 meV) structure in the low-temperature dielectric function of two valence-fluctuation materials: CePd3 and YbCu2Si2. The structure is consistent with energy-dependent scattering of electrons off a resonant level whose width and position (relative to the Fermi level) are roughly comparable. No such structure is observed in the integral-valent materials YPd3, DyPd3, and LuCu2Si2. The valence-fluctuation compounds CeCu2Si2 and CeAl3 do not show a resonance above 4 meV.

F. E. Pinkerton; A. J. Sievers; J. W. Wilkins; M. B. Maple; B. C. Sales

1981-10-05T23:59:59.000Z

224

50–500 MeV ??ray emission in the early phase of SN1987A  

Science Journals Connector (OSTI)

SN1987A was observed on 19th April 1987 with a combined high energy ??ray and hard x?ray payload flown on a stratospheric balloon from Alice Springs Australia. The ??ray detector sensitive in the energy range 50–500 MeV was an optical spark chamber with 400cm2 area a field of view of 60° FWHM and a time resolution of 10 ?s. The counting rate profile at ?2.2 mb float altitude has lead to a 3? upper limit to the steady ??ray flux of 7×10? 4 ph cm? 2 s? 1 in the 50–500 MeV range. This upper limit is compared to our predictions for the time profile of ??ray emission from SN1987A resulting from pulsar acceleration of particles to cosmic ray energies.

R. K. Sood; J. A. Thomas; L. Waldron; R. K. Manchanda; P. Ubertini; A. Bazzano; C. D. La Padula; G. K. Rochester; T. J. Sumner; G. Frye; T. Jenins; R. Koga; P. Albats

1988-01-01T23:59:59.000Z

225

Reaction ?-+p??-+?++n from 360 to 800 MeV  

Science Journals Connector (OSTI)

The reaction ?-+p??-+?++n is studied in the Lawrence Radiation Laboratory's 72-in. hydrogen bubble chamber. Events are located by scanning the pictures for ?+ tracks. Cross sections, Dalitz plots, and ?+?- and ?±n mass spectra are given at 360-, 430-, 460-, 480-, 555-, 605-, 673-, and 780-MeV beam energies. No clear evidence is found for ?+?- resonances between threshold and 680 MeV. However, there is a strong preference for high ?+?- effective masses, especially at the lowest beam energies. Arguments are given to ascrib this anomaly to the I=0 state of the ?-? system. The N32*(1238) isobar is observed in its negative charge state. The angular distribution of its production is discussed.

Janos Kirz, Joseph Schwartz, and Robert D. Tripp

1963-06-15T23:59:59.000Z

226

A novel way of constraining WIMPs annihilations in the Sun: MeV neutrinos  

SciTech Connect (OSTI)

Annihilation of dark matter particles accumulated in the Sun would produce a flux of high-energy neutrinos whose prospects of detection in neutrino telescopes and detectors have been extensively discussed in the literature. However, for annihilations into Standard Model particles, there would also be a flux of neutrinos in the MeV range from the decays at rest of muons and positively charged pions. These low-energy neutrinos have never been considered before and they open the possibility to also constrain dark matter annihilation in the Sun into e{sup +}e{sup ?}, ?{sup +}?{sup ?} or light quarks. Here we perform a detailed analysis using the recent Super-Kamiokande data in the few tens of MeV range to set limits on the WIMP-nucleon scattering cross section for different annihilation channels and computing the evaporation rate of WIMPs from the Sun for all values of the scattering cross section in a consistent way.

Bernal, Nicolás [Bethe Center for Theoretical Physics and Physikalisches Institut, Universität Bonn, Nußallee 12, D-53115 Bonn (Germany); Martín-Albo, Justo; Palomares-Ruiz, Sergio, E-mail: nicolas@th.physik.uni-bonn.de, E-mail: justo.martin-albo@ific.uv.es, E-mail: sergio.palomares.ruiz@ific.uv.es [Instituto de Física Corpuscular (IFIC), CSIC-Universitat de València, Apartado de Correos 22085, E-46071 València (Spain)

2013-08-01T23:59:59.000Z

227

Quasi-Elastic Charge-Exchange in Nh-2-]Pnn at 794 Mev  

E-Print Network [OSTI]

is fitted very well by the two exponential form do/dt =n~e8~~ +e2e~2' as has previously been found for the np elastic case. The ratio of the two cross sections at t =0 is 0.56+ 0.04. A modified impulse approximation calculation accounts for most features...) to the elastic CEX cross section (np-pn) is in the range of 0.5 to 0.7""although one such measurement' yiel. ded a value of 0.2 +0.035 at 380 MeV. At 152 MeV' it was found that this ratio increases with angle and reaches unity near 30' lab. Statistical...

Bonner, BE; Simmons, J. E.; Wallace, J. M.; Evans, M. L.; Glass, G.; Hiebert, John C.; Jain, M.; Northcliffe, L. C.; Bjork, C. W.; Riley, P. J.; Cassapakis, C. G.

1978-01-01T23:59:59.000Z

228

Measurements of the Fermilab 200 MeV transfer line quadrupole magnets  

SciTech Connect (OSTI)

This report presents the results of measurements of two quadrupole magnets that are used in the 200 MeV transfer line. The measurements were performed to obtain data to evaluate the suitability of these magnets for use in a 400 MeV transfer line once the Linac Upgrade is complete. In order to provide a basis for comparison, data were obtained from Fermilab's Magnet Test Facility of measurements of magnets of similar size and strength that were built for the Loma Linda project. These Loma Linda magnets are possible replacements for the ones presently in the 200 MeV transfer line. The Fermilab Linac Upgrade includes the reconfiguration of the transfer line that runs from the linac to the booster in order to handle the higher beam energy. Nominally, the quadrupole strengths will need to be 1.5 times their current operating points. This report will use a value of 1.7 to allow a tuning range to account differences in geometry between the old and new lines. Another goal in the design of the new transfer line is to produce a non-steering line. A complaint about the current line is that steering results from any attempt to re-tune the line. 18 figs., 3 tabs.

Kroc, T.

1990-03-22T23:59:59.000Z

229

A 14-MeV beam-plasma neutron source for materials testing  

SciTech Connect (OSTI)

The design and performance of 14-MeV beam-plasma neutron sources for accelerated testing of fusion reactor materials are described. Continuous production of 14-MeV neutron fluxes in the range of 5 to 10 MW/m{sup 2} at the plasma surface are produced by D-T reactions in a two-component plasma. In the present designs, 14-MeV neutrons result from collisions of energetic deuterium ions created by transverse injection of 150-keV deuterium atoms on a fully ionized tritium target plasma. The beam energy, which deposited at the center of the tritium column, is transferred to the warm plasma by electron drag, which flows axially to the end regions. Neutral gas at high pressure absorbs the energy in the tritium plasma and transfers the heat to the walls of the vacuum vessel. The plasma parameters of the neutron source, in dimensionless units, have been achieved in the 2XIIB high-{beta} plasma. The larger magnetic field of the present design permits scaling to the higher energy and density of the neutron source design. In the extrapolation, care has been taken to preserve the scaling and plasma attributes that contributed to equilibrium, magnetohydrodynamic (MHD) stability, and microstability in 2XIIB. The performance and scaling characteristics are described for several designs chosen to enhance the thermal isolation of the two-component plasmas. 11 refs., 3 figs., 3 tabs.

Futch, A.H.; Coensgen, F.H.; Damm, C.C.; Molvik, A.W.

1989-01-01T23:59:59.000Z

230

Nuclear Hydrogen Initiative  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Advanced Nuclear Research Advanced Nuclear Research Office of Nuclear Energy, Science and Technology FY 2003 Programmatic Overview Nuclear Hydrogen Initiative Nuclear Hydrogen Initiative Office of Nuclear Energy, Science and Technology Henderson/2003 Hydrogen Initiative.ppt 2 Nuclear Hydrogen Initiative Nuclear Hydrogen Initiative Program Goal * Demonstrate the economic commercial-scale production of hydrogen using nuclear energy by 2015 Need for Nuclear Hydrogen * Hydrogen offers significant promise for reduced environmental impact of energy use, specifically in the transportation sector * The use of domestic energy sources to produce hydrogen reduces U.S. dependence on foreign oil and enhances national security * Existing hydrogen production methods are either inefficient or produce

231

Nuclear / Radiological Advisory Team | National Nuclear Security  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

/ Radiological Advisory Team | National Nuclear Security / Radiological Advisory Team | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response Recapitalizing Our Infrastructure Continuing Management Reform Countering Nuclear Terrorism About Us Our Programs Our History Who We Are Our Leadership Our Locations Budget Our Operations Media Room Congressional Testimony Fact Sheets Newsletters Press Releases Speeches Events Social Media Video Gallery Photo Gallery NNSA Archive Federal Employment Apply for Our Jobs Our Jobs Working at NNSA Blog Nuclear / Radiological Advisory Team Home > About Us > Our Programs > Emergency Response > Responding to Emergencies > Operations > Nuclear / Radiological Advisory Team Nuclear / Radiological Advisory Team

232

Nuclear Nonproliferation Program Offices | National Nuclear Security  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Nonproliferation Program Offices | National Nuclear Security Nonproliferation Program Offices | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response Recapitalizing Our Infrastructure Continuing Management Reform Countering Nuclear Terrorism About Us Our Programs Our History Who We Are Our Leadership Our Locations Budget Our Operations Media Room Congressional Testimony Fact Sheets Newsletters Press Releases Speeches Events Social Media Video Gallery Photo Gallery NNSA Archive Federal Employment Apply for Our Jobs Our Jobs Working at NNSA Blog Nuclear Nonproliferation Program Offices Home > About Us > Our Programs > Nonproliferation > Nuclear Nonproliferation Program Offices Nuclear Nonproliferation Program Offices One of the gravest threats the United States and the international

233

Nuclear Nonproliferation Program Offices | National Nuclear Security  

National Nuclear Security Administration (NNSA)

Nonproliferation Program Offices | National Nuclear Security Nonproliferation Program Offices | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response Recapitalizing Our Infrastructure Continuing Management Reform Countering Nuclear Terrorism About Us Our Programs Our History Who We Are Our Leadership Our Locations Budget Our Operations Media Room Congressional Testimony Fact Sheets Newsletters Press Releases Speeches Events Social Media Video Gallery Photo Gallery NNSA Archive Federal Employment Apply for Our Jobs Our Jobs Working at NNSA Blog Nuclear Nonproliferation Program Offices Home > About Us > Our Programs > Nonproliferation > Nuclear Nonproliferation Program Offices Nuclear Nonproliferation Program Offices One of the gravest threats the United States and the international

234

Nuclear Systems Technology | Nuclear Science | ORNL  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Advanced Fuel Cycle Systems Criticality Safety Irradiation Experiment Development and Execution Robotics & Remote Systems Engineering and Applications Thermal & Hydraulic Experiments & Analysis Used Nuclear Fuel Storage, Transportation, and Disposal Reactor Technology Nuclear Science Home | Science & Discovery | Nuclear Science | Research Areas | Nuclear Systems Technology SHARE Nuclear Systems Technology Nuclear Systems Technology Image 2 ORNL has had historic involvement in a broad set of nuclear research areas: irradiated materials and isotopes R&D, fission and fusion reactors development, neutron scattering, fuel enrichment, used fuel recycling and disposal, etc. The skills and knowledge required to succeed in these research areas often cultivated core areas of expertise in which ORNL is

235

From sideward flow to nuclear compressibility  

SciTech Connect (OSTI)

The authors use the transport model (BUU) with different optical potentials, combining density and momentum dependence with strong or weak nuclear compressibility, to simulate heavy-ion collisions. Experiment by DIOGENE allows them to show that experimental sideward flow is close to their calculations using optical potential of soft momentum- and density-dependence (Potential I), as well as calculations using optical potential of stiff pure density-dependence (Potential II). On the other hand, the Plastic Ball experiment on sideward flow, mainly due to the instrumental rejection of low transverse momentum particles, allows the authors to tell the differences between Potential I and II, with calculations using Potential I being close to the experimental data. Combining the results above, they see that only potential I with soft nuclear compressibility can describe the experimental data. The uncertainty of NN cross section in the medium leads to the uncertainty in nuclear compressibility, they estimate that the nuclear compressibility K lies between 180 and 235 MeV.

Pan, Q.; Danielewicz, P.

1993-04-01T23:59:59.000Z

236

Nuclear symmetry energy from the Fermi-energy difference in nuclei  

E-Print Network [OSTI]

The neutron-proton Fermi-energy difference and the correlation to nucleon separation energies for some magic nuclei are investigated with the Skyrme energy density functionals and nuclear masses, with which the nuclear symmetry energy at sub-saturation densities is constrained from 54 Skyrme parameter sets. The extracted nuclear symmetry energy at sub-saturation density of 0.11 fm$^{-3}$ is 26.2 $\\pm$ 1.0 MeV with 1.5 $\\sigma$ uncertainty. By further combining the neutron-skin thickness of 208Pb, ten Skyrme forces with slope parameter of 28energy around saturation densities.

Ning Wang; Li Ou; Min Liu

2013-03-15T23:59:59.000Z

237

Nuclear power, nuclear eapons link argued  

Science Journals Connector (OSTI)

Nuclear power, nuclear eapons link argued ... The problem of the spread of nuclear weapons to nations not currently possessing them—so-called horizontal proliferation—often is linked to development of commercial nuclear power. ... However, John P. Holdren, professor of energy and resources at the University of California, Berkeley, maintains that commercial nuclear power is linked intimately to horizontal proliferation and that the development of alternative energy technologies is crucial to prevent the spread. ...

1982-02-08T23:59:59.000Z

238

The Nuclear Revolution, Relative Gains, and International Nuclear Assistance  

E-Print Network [OSTI]

international nuclear assistance dataset, this article findsinternational nuclear assistance dataset. Table 2 presentsinternational nuclear assistance dataset. Table 3 presents

Kroenig, Matthew

2006-01-01T23:59:59.000Z

239

Global Nuclear Energy Partnership Fact Sheet - Minimize Nuclear...  

Broader source: Energy.gov (indexed) [DOE]

Minimize Nuclear Waste Global Nuclear Energy Partnership Fact Sheet - Minimize Nuclear Waste GNEP will increase the efficiency in the management of used nuclear fuel, also known as...

240

Nuclear spin response studies in inelastic polarized proton scattering  

SciTech Connect (OSTI)

Spin-flip probabilities S/sub nn/ have been measured for inelastic proton scattering at incident proton energies around 300 MeV from a number of nuclei. At low excitation energies S/sub nn/ is below the free value. For excitation energies above about 30 MeV for momentum transfers between about 0.35 fm/sup /minus/1/ and 0.65 fm/sup / minus/1/ S/sub nn/ exceeds free values significantly. These results suggest that the relative ..delta..S = 1(..delta..S = 0 + ..delta..S = 1) nuclear spin response approaches about 90% in the region of the enhancement. Comparison of the data with slab response calculations are presented. Decomposition of the measured cross sections into sigma(..delta..S = 0) and sigma(..delta..S = 1) permit extraction of nonspin-flip and spin-flip dipole and quadrupole strengths. 29 refs., 11 figs.

Jones, K.W.

1988-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "mev cm-1 nuclear" 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

High energy gamma ray production in proton-induced reactions at 104, 145, and 195 MeV  

Science Journals Connector (OSTI)

Energy spectra and angular distributions have been measured for high energy gamma rays (E??20 MeV) from proton-nucleus reactions at 104, 145, and 195 MeV on targets of C, Zn, and Pb. Gamma rays were observed with energies up to 170 MeV. The spectra showed differences from the typical exponential shape that is observed in gamma ray production from heavy-ion reactions. The angular distribution of the gamma ray is forward peaked in the laboratory, which is consistent with emission from a moving source. A comparison is made with previous measurements at 72, 140, 168, and 200 MeV. The experimental evidence indicates that first-chance incoherent proton-neutron bremsstrahlung is the main production mechanism.

J. Clayton; W. Benenson; M. Cronqvist; R. Fox; D. Krofcheck; R. Pfaff; T. Reposeur; J. D. Stevenson; J. S. Winfield; B. Young; M. F. Mohar; C. Bloch; D. E. Fields

1992-04-01T23:59:59.000Z

242

Advances in 14 MeV neutron activation analysis by means of a new intense neutron source  

Science Journals Connector (OSTI)

A new intense 14 MeV neutron generator with cylindrical acceleration structure has been put in operation at the GKSS Research Center Geesthacht. The sealed neutron tube is combined with...10 n/cm2s. Theoretical s...

R. Pepelnik; H. -U. Fanger; W. Michaelis; B. Anders

1982-01-01T23:59:59.000Z

243

Nuclear radiation electronic gear (continued)  

Science Journals Connector (OSTI)

Nuclear radiation electronic gear (continued) ... Examines nuclear instrumentation available from several major U.S. manufacturers. ... Nuclear / Radiochemistry ...

S. Z. Lewin

1961-01-01T23:59:59.000Z

244

Innovations in Nuclear Infrastructure  

Broader source: Energy.gov (indexed) [DOE]

Innovations in Nuclear Infrastructure Innovations in Nuclear Infrastructure and Education (INIE) Innovations in Nuclear Infrastructure and Education (INIE) Presented to the Nuclear Energy Research Advisory Committee Crystal City, Virginia John Gutteridge Director, University Programs Office of Nuclear Energy, Science and Technology September 30 - October 1, 2002 Office of Nuclear Energy, Science and Technology Gutteridge/Sep-Oct_02 INIE-NERAC.ppt (2) INIE The Stimuli .... INIE The Stimuli .... 6 Declining number of operating university research/training reactors 6 Dwindling student population in nuclear engineering 6 Closing or loss of identity of university nuclear engineering programs 6 Looming shortage of nuclear engineering graduates 6 Threat of additional reactor closures -- Cornell, Michigan, MIT

245

Reconversion of nuclear weapons  

E-Print Network [OSTI]

The nuclear predicament or nuclear option. Synopsis of three lectures : 1- The physical basis of nuclear technology. Physics of fission. Chain reaction in reactors and weapons. Fission fragments. Separration of isotopes. Radiochemistry.2- Nuclear reactors with slow and fast neutrons. Power, size, fuel and waste. Plutonium production. Dose rate, shielding and health hazard. The lessons of Chernobyl3- Nuclear weapons. Types, energy, blast and fallout. Fusion and hydrogen bombs. What to do with nuclear weapons when you cannot use them? Testing. Nonmilittary use. Can we get rid of the nuclear weapon? Nuclear proliferation. Is there a nuclear future?

Kapitza, Sergei P

1993-01-01T23:59:59.000Z

246

Nuclear Security Enterprise | National Nuclear Security Administration  

National Nuclear Security Administration (NNSA)

Enterprise | National Nuclear Security Administration Enterprise | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response Recapitalizing Our Infrastructure Continuing Management Reform Countering Nuclear Terrorism About Us Our Programs Our History Who We Are Our Leadership Our Locations Budget Our Operations Media Room Congressional Testimony Fact Sheets Newsletters Press Releases Speeches Events Social Media Video Gallery Photo Gallery NNSA Archive Federal Employment Apply for Our Jobs Our Jobs Working at NNSA Blog Nuclear Security Enterprise Home > About Us > Our Programs > Defense Programs > Nuclear Security Enterprise Nuclear Security Enterprise The Nuclear Security Enterprise (NSE) mission is to ensure the Nation sustains a safe, secure, and effective nuclear deterrent through the

247

National Nuclear Data Center  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Internal Radiation Dose Evaluated Nuclear (reaction) Data File Experimental nuclear reaction data Sigma Retrieval & Plotting Nuclear structure & decay Data Nuclear Science References Experimental Unevaluated Nuclear Data List Evaluated Nuclear Structure Data File NNDC databases Ground and isomeric states properties Nuclear structure & decay data journal Nuclear reaction model code Tools and Publications US Nuclear Data Program Cross Section Evaluation Working Group Nuclear data networks Basic properties of atomic nuclei Parameters & thermal values Basic properties of atomic nuclei Internal Radiation Dose Evaluated Nuclear (reaction) Data File Experimental nuclear reaction data Sigma Retrieval & Plotting Nuclear structure & decay Data Nuclear Science References Experimental Unevaluated Nuclear Data List Evaluated Nuclear Structure Data File NNDC databases Ground and isomeric states properties Nuclear structure & decay data journal Nuclear reaction model code Tools and Publications US Nuclear Data Program Cross Section Evaluation Working Group Nuclear data networks Basic properties of atomic nuclei Parameters & thermal values Basic properties of atomic nuclei Homepage BNL Home Site Index - Go USDNP and CSEWG November 18-22! USNDP CSEWG Agenda Thanks for attending! EXFOR 20,000 Milestone EXFOR Milestone 20,000 experimental works are now in the EXFOR database!

248

INSTRUCTIONS FOR SUBMITTING NUCLEAR  

E-Print Network [OSTI]

waste management proceedings. Keywords Nuclear, nuclear power plant, spent fuel, nuclear waste, dataCALIFORNIA ENERGY COMMISSION INSTRUCTIONS FOR SUBMITTING NUCLEAR POWER PLANT-RELATED DATA of Submitted Data 3 NUCLEAR POWER PLANT DATA REQUESTS 6 A. Environmental Impacts 6 B. Spent Fuel Generation 8 C

249

If Terrorists Go Nuclear  

Science Journals Connector (OSTI)

...officials, two nuclear indus-try...urging the nuclear nations to...a terrorist attack is increasing...in the same risk category as...Prevention ofNuclear Terrorism," by the...to protect nuclear weapons against...security at civil plants. * As civil...The nuclear power industry should...

ELIOT MARSHALL

1986-07-11T23:59:59.000Z

250

If Terrorists Go Nuclear  

Science Journals Connector (OSTI)

...officials, two nuclear indus-try...urging the nuclear nations to...terrorist attack is increasing...the same risk category...ofNuclear Terrorism," by the...to protect nuclear weapons against...aid U.S. security, O'Keefe...at civil plants. * As civil...The nuclear power industry...

ELIOT MARSHALL

1986-07-11T23:59:59.000Z

251

Reactor & Nuclear Systems Publications | ORNL  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Nuclear Science Home | Science & Discovery | Nuclear Science | Publications and Reports | Reactor and Nuclear Systems Publications SHARE Reactor and Nuclear Systems Publications...

252

Subthreshold Pion Production in Heavy-Ion Collisions at 85A MeV  

Science Journals Connector (OSTI)

The ?+ production in 85A-MeV C+C and C+Au reactions has been studied for 20 MeV55°. The cross sections, d2?d? dE, fall exponentially with E? and are 9 times larger for C+Au than for C+C. The angular distribution is backward peaked for C+Au in the nucleon-nucleon c.m. system, while it is weakly forward peaked in the nucleus-nucleus c.m. system. An independent nucleon-nucleon scattering model can explain the data only if diffuse internal momentum distributions are introduced.

T. Johansson; H. -Å. Gustafsson; B. Jakobsson; P. Kristiansson; B. Norén; A. Oskarsson; L. Carlén; I. Otterlund; H. Ryde; J. Julien; C. Guet; R. Bertholet; M. Maurel; H. Nifenecker; P. Perrin; F. Schussler; G. Tibell; M. Buenerd; J. M. Loiseaux; P. Martin; J. P. Bondorf; O. -B. Nielsen; A. O. T. Karvinen; J. Mougey

1982-03-15T23:59:59.000Z

253

Giant resonances in (116)Sn from 240 MeV (6)Li scattering  

E-Print Network [OSTI]

PHYSICAL REVIEW C 79, 024320 (2009) Giant resonances in 116Sn from 240 MeV 6Li scattering X. Chen, Y.-W. Lui, H. L. Clark, Y. Tokimoto, and D. H. Youngblood Cyclotron Institute, Texas A&M University, College Station, Texas 77843, USA (Received.... Bronson, U. Garg, Y.-W. Lui, and C. M. Rozsa, Phys. Rev. C 23, 1997 (1981). [3] J. P. Blaizot, Phys. Rep. 64, 171 (1980). [4] S. Stringari, Phys. Lett. B108, 232 (1982). [5] D. H. Youngblood, H. L. Clark, and Y.-W. Lui, Phys. Rev. Lett. 82, 691 (1999...

Chen, X.; Lui, Y. -W; Clark, H. L.; Tokimoto, Y.; Youngblood, David H.

2009-01-01T23:59:59.000Z

254

Isoscalar E0 strength between 6 and 11 MeV in Ca-40  

E-Print Network [OSTI]

Isoscalar E0 strength between 6 and 11 MeV in 40Ca D. H. Youngblood, Y.-W. Lui, H. L. Clark, Y. Tokimoto, and B. John* Cyclotron Institute, Texas A&M University, College Station, Texas 77843, USA (Received 19 August 2003; published 20 November... strengths of the two peaks seen in the data. This work was supported in part by the U.S. Department of Energy under Grant No. DE-FG03-93ER40773 and by The Robert A. Welch Foundation. [1] D. H. Youngblood, Y.-W. Lui, and H. L. Clark, Phys. Rev. C 63...

Youngblood, David H.; Lui, YW; Clark, HL; Tokimoto, Y.; John, B.

2003-01-01T23:59:59.000Z

255

Bremsstrahlung linear polarization at incident electron energies of 0.5-1.5 MeV  

Science Journals Connector (OSTI)

At incident electron energies of 0.5-1.5 MeV, bremsstrahlung linear polarization was measured for thin targets of beryllium, aluminum, silver, and gold at emission angles of 10°-122° as a function of photon energy. Data were corrected for electron scattering in the target and for multiple scattering of photons in the Compton polarimeter used. For low-atomic-number targets the experimental results are perfectly in agreement with Born-approximation theory and with computations using Sommerfeld-Maue eigen-functions, whereas the high-atomic-number results are described satisfactorily only by partial-wave calculations.

W. Lichtenberg; A. Przybylski; M. Scheer

1975-02-01T23:59:59.000Z

256

Relative Sizes of Ca-40,48 from Scattering of 79 Mev Alpha-Particles  

E-Print Network [OSTI]

The differential .cross sections of elastically scattered 79.1+0.1 MeV a particles from "Ca and "Ca have been measured at the Texas ASM Uni- versity Cyclotron Institute. The targets were self- supporting foils (0.24 mg/cm' natural CaO and 0.94 mg/cm' CaO... enriched to 95% in 4'Ca). The scattered n particles were detected with two 3 mm Si(Li) detectors separated by a 5.5' angle in a single rotatable mount. Angular acceptance was 0.3'for each detector and energy resolution was about 150 keV [full width...

Lerner, G. M.; Hiebert, John C.; Rutledge, L. L.; Papanicolas, C.; Berenstein, A. M.

1975-01-01T23:59:59.000Z

257

Intense slow positron production at the 15 MeV LINAC at Argonne National Laboratory  

Science Journals Connector (OSTI)

An intense slow positron beam using a 15 MeV LINAC (average current 1.25 × 1015 e?/s) at the Radiation and Photochemistry Group, Chemistry Division of Argonne National Laboratory (ANL) has been proposed and studied. Computer simulated results optimizing the positron yield and distribution of energy and angle show that a slow positron production at 1010 e+/s is possible. A proposed design of an intense slow positron beam with optimal conditions of incident electron, converter/moderator configurations, and extraction/transportation is presented.

H.M. Chen; Y.C. Jean; C.D. Jonah; S. Chemerisov; A.F. Wagner; D.M. Schrader; A.W. Hunt

2006-01-01T23:59:59.000Z

258

Model calculations of radiative capture of nucleons in MeV region  

SciTech Connect (OSTI)

We address calculations of the neutron and the proton radiative capture at incident energies up to 20 MeV on medium and heavy nuclei. The main formalism used is the pre-equilibrium (exciton) model of {gamma} emission. A link to the Consistent Direct-Semidirect model is noticed as well. The resulting pre-equilibrium (plus equilibrium) calculations of the radiative capture excitation functions are compared to experimental data and also some cross section trends important for possible production of therapeutic radioisotopes are extracted.

Betak, E. [Institute of Physics, Slovak Acad. Sciences, 84511 Bratislava (Slovakia); Faculty of Philosophy and Sciences, Silesian Univ., 74601 Opava (Czech Republic)

2006-03-13T23:59:59.000Z

259

The Cosmic MeV Neutrino Background as a Laboratory for Black Hole Formation  

E-Print Network [OSTI]

Calculations of the cosmic rate of core collapses, and the associated neutrino flux, commonly assume that a fixed fraction of massive stars collapse to black holes. We argue that recent results suggest that this fraction instead increases with redshift. With relatively more stars vanishing as "unnovae" in the distant universe, the detectability of the cosmic MeV neutrino background is improved due to their hotter neutrino spectrum, and expectations for supernova surveys are reduced. We conclude that neutrino detectors, after the flux from normal SNe is isolated via either improved modeling or the next Galactic SN, can probe the conditions and history of black hole formation.

Hasan Yuksel; Matthew D. Kistler

2014-10-01T23:59:59.000Z

260

Proton induced reactions on naturalU at 62.9 MeV  

E-Print Network [OSTI]

Double differential cross sections (DDCS) for light charged particles (proton, deuteron, triton, 3He, alpha) and neutrons produced by a proton beam impinging on a 238U target at 62.9 MeV were measured at the CYCLONE facility in Louvain-la-Neuve (Belgium). These measurements have been performed using two independent experimental set-ups ensuring neutron (DeMoN counters) and light charged particles (Si-Si-CsI telescopes) detection. The charged particle data were measured at 11 different angular positions from 25 degrees to 140 degrees allowing the determination of angle differential, energy differential and total production cross sections.

A. Guertin; S. Auduc; G. Rivière; P. Eudes; F. Haddad; C. Lebrun; T. Kirchner; C. Le Brun; F. R. Lecolley; J. F. Lecolley; M. Louvel; F. Lefebvres; N. Marie; C. Varignon; X. Ledoux; Y. Patin; Ph. Pras; Th. Delbar; A. Ninane; L. Stuttge; F. Hanappe; the GEDEON Collaboration

2005-12-19T23:59:59.000Z

Note: This page contains sample records for the topic "mev cm-1 nuclear" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

Re-evaluation of Neutron-4He Elastic Scattering Data near 20 MeV  

E-Print Network [OSTI]

Measured differential elastic scattering cross sections of 17.71-, 20.97-, and 23.72-MeV neutrons from liquid helium-4 were re-evaluated and corrected for sample size and multiple scattering effects by means of a Monte Carlo technique implemented in a more recent code (MCNPX). Results indicate that earlier corrections via a code, MAGGIE-2, overestimated the size of multiple scattering effects by an order of magnitude. The corrected differential cross sections and Legendre coefficients obtained by least-squares fits are given.

M. Drosg; R. Avalos Ortiz; B. Hoop

2011-04-10T23:59:59.000Z

262

Nuclear power: an outlook  

Science Journals Connector (OSTI)

Nuclear power: an outlook ... For nuclear power to regain public acceptance and investor confidence, the nation's nuclear plants must sustain an unblemished safety record, reflecting an industrywide commitment to the highest professional standards. ...

1983-11-14T23:59:59.000Z

263

Press Release: Nuclear Power  

Science Journals Connector (OSTI)

Two nuclear physicists, a nuclear engineer, and an economistmmembers of the Union of Concerned Scientists--released a report today that examined a new problem with nuclear reactor safety. According to the repo...

Henry W. Kendall

2000-01-01T23:59:59.000Z

264

Nuclear Data Links  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Links to Other Useful Sites Online Journals Institutions and Programs Related to Nuclear Physics U.S. Nuclear Data Program: All evaluated nuclear data supported by the U.S....

265

Nuclear functions of prefoldin  

Science Journals Connector (OSTI)

...original author and source are credited. Nuclear functions of prefoldin Gonzalo Millan-Zambrano...and are functionally connected with nuclear processes in yeast and metazoa. Plant...available on the involvement of prefoldin in nuclear phenomena, place special emphasis on...

2014-01-01T23:59:59.000Z

266

Nuclear Workforce Initiative - SRSCRO  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

nuclear Nuclear Workforce Initiative The United States stands on the brink of a nuclear renaissance - a resurging confidence in the power of the clean, safe atom to finally conquer...

267

Nuclear chemistry at Harvard  

Science Journals Connector (OSTI)

Nuclear chemistry at Harvard ... This article points out the potential of the chemistry department at Harvard University for research in nuclear chemistry for students who wish to do work in the field for the Ph.D. degree. ... Nuclear / Radiochemistry ...

Geoffrey Wilkinson; Richard M. Diamond; Eugene G. Rochow

1954-01-01T23:59:59.000Z

268

Nuclear Explosive Safety  

Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]

The Order establishes requirements to implement the nuclear explosive safety (NES) elements of DOE O 452.1E, Nuclear Explosive and Weapon Surety Program, for routine and planned nuclear explosive operations (NEOs).

2014-07-10T23:59:59.000Z

269

Nuclear Explosive Safety  

Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]

This Department of Energy (DOE) Order establishes requirements to implement the nuclear explosive safety (NES) elements of DOE O 452.1E, Nuclear Explosive and Weapon Surety Program, or successor directive, for routine and planned nuclear explosive operations (NEOs).

2015-01-26T23:59:59.000Z

270

High Energy Nuclear Events  

Science Journals Connector (OSTI)

......research-article Articles High Energy Nuclear Events Enrico Fermi Institute...Distribution of Pions produced in High Energy Nuclear Collisions Yoshihiro Yamamoto...Possible Interpretation of High Energy Nuclear Events Nobuo Yajima, Shuji Takagi......

Enrico Fermi

1950-07-01T23:59:59.000Z

271

Nuclear Fuel Cycle & Vulnerabilities  

SciTech Connect (OSTI)

The objective of safeguards is the timely detection of diversion of significant quantities of nuclear material from peaceful nuclear activities to the manufacture of nuclear weapons or of other nuclear explosive devices or for purposes unknown, and deterrence of such diversion by the risk of early detection. The safeguards system should be designed to provide credible assurances that there has been no diversion of declared nuclear material and no undeclared nuclear material and activities.

Boyer, Brian D. [Los Alamos National Laboratory

2012-06-18T23:59:59.000Z

272

Nuclear Security 101 | National Nuclear Security Administration  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

101 | National Nuclear Security Administration 101 | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response Recapitalizing Our Infrastructure Continuing Management Reform Countering Nuclear Terrorism About Us Our Programs Our History Who We Are Our Leadership Our Locations Budget Our Operations Media Room Congressional Testimony Fact Sheets Newsletters Press Releases Speeches Events Social Media Video Gallery Photo Gallery NNSA Archive Federal Employment Apply for Our Jobs Our Jobs Working at NNSA Blog Home > Media Room > Fact Sheets > Nuclear Security 101 Fact Sheet Nuclear Security 101 Mar 23, 2012 The goal of United States Government's nuclear security programs is to prevent the illegal possession, use or transfer of nuclear material,

273

Nuclear Security | National Nuclear Security Administration  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

| National Nuclear Security Administration | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response Recapitalizing Our Infrastructure Continuing Management Reform Countering Nuclear Terrorism About Us Our Programs Our History Who We Are Our Leadership Our Locations Budget Our Operations Media Room Congressional Testimony Fact Sheets Newsletters Press Releases Speeches Events Social Media Video Gallery Photo Gallery NNSA Archive Federal Employment Apply for Our Jobs Our Jobs Working at NNSA Blog Nuclear Security Home > About Us > Our Programs > Nuclear Security Nuclear Security The Office of Defense Nuclear Security (DNS) is responsible for the development and implementation of security programs for NNSA. In this capacity, DNS is the NNSA line management organization responsible for

274

Nuclear Security 101 | National Nuclear Security Administration  

National Nuclear Security Administration (NNSA)

101 | National Nuclear Security Administration 101 | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response Recapitalizing Our Infrastructure Continuing Management Reform Countering Nuclear Terrorism About Us Our Programs Our History Who We Are Our Leadership Our Locations Budget Our Operations Media Room Congressional Testimony Fact Sheets Newsletters Press Releases Speeches Events Social Media Video Gallery Photo Gallery NNSA Archive Federal Employment Apply for Our Jobs Our Jobs Working at NNSA Blog Home > Media Room > Fact Sheets > Nuclear Security 101 Fact Sheet Nuclear Security 101 Mar 23, 2012 The goal of United States Government's nuclear security programs is to prevent the illegal possession, use or transfer of nuclear material,

275

Nuclear Security | National Nuclear Security Administration  

National Nuclear Security Administration (NNSA)

| National Nuclear Security Administration | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response Recapitalizing Our Infrastructure Continuing Management Reform Countering Nuclear Terrorism About Us Our Programs Our History Who We Are Our Leadership Our Locations Budget Our Operations Media Room Congressional Testimony Fact Sheets Newsletters Press Releases Speeches Events Social Media Video Gallery Photo Gallery NNSA Archive Federal Employment Apply for Our Jobs Our Jobs Working at NNSA Blog Nuclear Security Home > About Us > Our Programs > Nuclear Security Nuclear Security The Office of Defense Nuclear Security (DNS) is responsible for the development and implementation of security programs for NNSA. In this capacity, DNS is the NNSA line management organization responsible for

276

Nuclear Structure and Nuclear Reactions | Argonne Leadership...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

the ab initio no-core full configuration approach," Phys. Rev. C 86, 034325 (2012) Nuclear Structure and Nuclear Reactions PI Name: James Vary PI Email: jvary@iastate.edu...

277

Nuclear Quadrupole Moments and Nuclear Shell Structure  

DOE R&D Accomplishments [OSTI]

Describes a simple model, based on nuclear shell considerations, which leads to the proper behavior of known nuclear quadrupole moments, although predictions of the magnitudes of some quadrupole moments are seriously in error.

Townes, C. H.; Foley, H. M.; Low, W.

1950-06-23T23:59:59.000Z

278

Time-of-flight mass measurements for nuclear processes in neutron star crusts  

E-Print Network [OSTI]

The location of electron capture heat sources in the crust of accreting neutron stars depends on the masses of extremely neutron-rich nuclei. We present first results from a new implementation of the time-of-flight technique to measure nuclear masses of rare isotopes at the National Superconducting Cyclotron Laboratory. The masses of 16 neutron-rich nuclei in the scandium -- nickel range were determined simultaneously, improving the accuracy compared to previous data in 12 cases. The masses of $^{61}${V}, $^{63}${Cr}, $^{66}${Mn}, and $^{74}${Ni} were measured for the first time with mass excesses of $-30.510(890)$ MeV, $-35.280(650)$ MeV, $-36.900(790)$ MeV, and $-49.210(990)$ MeV, respectively. With the measurement of the $^{66}$Mn mass, the locations of the two dominant electron capture heat sources in the outer crust of accreting neutron stars that exhibit superbursts are now experimentally constrained. We find that the location of the $^{66}$Fe$\\rightarrow^{66}$Mn electron capture transition occurs significantly closer to the surface than previously assumed because our new experimental Q-value is 2.1 MeV (2.6$\\sigma$) smaller than predicted by the FRDM mass model.

A. Estrade; M. Matos; H. Schatz; A. M. Amthor; D. Bazin; M. Beard; A. Becerril; E. F. Brown; R. Cyburt; T. Elliot; A. Gade; D. Galaviz; S. George; S. S. Gupta; W. R. Hix; R. Lau; G. Lorusso; P. Moller; J. Pereira; M. Portillo; A. M. Rogers; D. Shapira; E. Smith; A. Stolz; M. Wallace; M. Wiescher

2011-09-23T23:59:59.000Z

279

International Nuclear Security | National Nuclear Security Administrat...  

National Nuclear Security Administration (NNSA)

Twitter Youtube Flickr RSS People Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response Recapitalizing Our Infrastructure...

280

Nuclear Forensics | National Nuclear Security Administration  

National Nuclear Security Administration (NNSA)

Twitter Youtube Flickr RSS People Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response Recapitalizing Our Infrastructure...

Note: This page contains sample records for the topic "mev cm-1 nuclear" 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

6 Nuclear Fuel Designs  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Message from the Director Message from the Director 2 Nuclear Power & Researrh Reactors 3 Discovery of Promethium 4 Nuclear Isotopes 4 Nuclear Medicine 5 Nuclear Fuel Processes & Software 6 Nuclear Fuel Designs 6 Nuclear Safety 7 Nuclear Desalination 7 Nuclear Nonproliferation 8 Neutron Scattering 9 Semiconductors & Superconductors 10 lon-Implanted Joints 10 Environmental Impact Analyses 11 Environmental Quality 12 Space Exploration 12 Graphite & Carbon Products 13 Advanced Materials: Alloys 14 Advanced Materials: Ceramics 15 Biological Systems 16 Biological Systems 17 Computational Biology 18 Biomedical Technologies 19 Intelligent Machines 20 Health Physics & Radiation Dosimetry 21 Radiation Shielding 21 Information Centers 22 Energy Efficiency: Cooling & Heating

282

LANL | Physics | Nuclear Physics  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Leaders in nuclear physics Physics Division scientists and engineers play an important role in the Laboratory's Nuclear Physics program, funded by the Department of Energy's Office...

283

Nuclear and Particle Futures  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Nuclear and Particle Futures Nuclear and Particle Futures The Lab's four Science Pillars harness capabilities for solutions to threats- on national and global scales. Contacts...

284

Nuclear Energy Advisory Committee  

Broader source: Energy.gov [DOE]

The Nuclear Energy Advisory Committee (NEAC), formerly the Nuclear Energy Research Advisory Committee (NERAC), was established on October 1, 1998, to provide independent advice to the Office of...

285

Nuclear Safety Regulatory Framework  

Energy Savers [EERE]

Department of Energy Nuclear Safety Regulatory Framework DOE's Nuclear Safety Enabling Legislation Regulatory Enforcement & Oversight Regulatory Governance Atomic Energy Act 1946...

286

Nuclear Force from Lattice QCD  

E-Print Network [OSTI]

The first lattice QCD result on the nuclear force (the NN potential) is presented in the quenched level. The standard Wilson gauge action and the standard Wilson quark action are employed on the lattice of the size 16^3\\times 24 with the gauge coupling beta=5.7 and the hopping parameter kappa=0.1665. To obtain the NN potential, we adopt a method recently proposed by CP-PACS collaboration to study the pi pi scattering phase shift. It turns out that this method provides the NN potentials which are faithful to those obtained in the analysis of NN scattering data. By identifying the equal-time Bethe-Salpeter wave function with the Schroedinger wave function for the two nucleon system, the NN potential is reconstructed so that the wave function satisfies the time-independent Schroedinger equation. In this report, we restrict ourselves to the J^P=0^+ and I=1 channel, which enables us to pick up unambiguously the ``central'' NN potential V_{central}(r). The resulting potential is seen to posses a clear repulsive core of about 500 MeV at short distance (r < 0.5 fm). Although the attraction in the intermediate and long distance regions is still missing in the present lattice set-up, our method is appeared to be quite promising in reconstructing the NN potential with lattice QCD.

Noriyoshi ISHII; Sinya AOKI; Tetsuo HATSUDA

2006-09-30T23:59:59.000Z

287

Isospin-asymmetric nuclear matter  

E-Print Network [OSTI]

This study uses classical molecular dynamics to simulate infinite nuclear matter and study the effect of isospin asymmetry on bulk properties such as energy per nucleon, pressure, saturation density, compressibility and symmetry energy. The simulations are performed on systems embedded in periodic boundary conditions with densities and temperatures in the ranges $\\rho$=0.02 to 0.2 fm$^{-3}$ and T = 1, 2, 3, 4 and 5 MeV, and with isospin content of $x=Z/A$=0.3, 0.4 and 0.5. The results indicate that symmetric and asymmetric matter are self-bound at some temperatures and exhibit phase transitions from a liquid phase to a liquid-gas mixture. The main effect of isospin asymmetry is found to be a reduction of the equilibrium densities, a softening of the compressibility and a disappearance of the liquid-gas phase transition. A procedure leading to the evaluation of the symmetry energy and its variation with the temperature was devised, implemented and compared to mean field theory results.

J. A. López; E. Ramírez-Homs; R. González; R. Ravelo

2013-11-24T23:59:59.000Z

288

Spacings of Nuclear Energy Levels  

Science Journals Connector (OSTI)

The distribution of spacings of nuclear energy levels in many heavy nuclei at an excitation energy of 5 to 9 Mev is obtained by careful correction of the observed distributions for the effect of failure to observe all levels. Results of transmission measurements on U234 and U236, as measured with the Brookhaven fast chopper, are presented. The experimental spacings of the zero-spin nuclides are considered first since all the levels from slow neutron capture have the same spin. The results show a deficiency of small spacings relative to the exponential distribution, which corresponds to a random occurrence of levels. In the analysis it is shown that there is no local correlation of neutron widths and level spacings. The "level repulsion" effect is also found for the nuclides of nonzero spin, for which the data are more abundant but the analysis is complicated by the presence of two spin systems. The distribution obtained is in agreement with one suggested by Wigner based on a probability of level occurrence proportional to the spacing S. The corrections here developed are also applied to the reduced neutron width distribution and this corrected distribution is in good agreement with the Porter-Thomas distribution.

John A. Harvey and D. J. Hughes

1958-01-15T23:59:59.000Z

289

Assessment of Nuclear Resonance Fluorescence for Spent Nuclear Fuel Assay  

E-Print Network [OSTI]

Security of the National Nuclear Security Administration, USof Energys National Nuclear Security Administration (NNSA)

Quiter, Brian

2012-01-01T23:59:59.000Z

290

Neutron-deuteron analyzing power data at En=22.5 MeV  

Science Journals Connector (OSTI)

We present measurements of n-d analyzing power, Ay(?), at En=22.5 MeV. The experiment uses a shielded neutron source which produced polarized neutrons via the 2H(d?,n?)3He reaction. It also uses a deuterated liquid-scintillator center detector and six pairs of liquid-scintillator neutron side detectors. Elastic neutron scattering events are identified by using time-of-flight techniques and by setting a window in the center detector pulse-height spectrum. The beam polarization is monitored by using a high-pressure helium gas cell and an additional pair of liquid-scintillator side detectors. The n-d Ay(?) data were corrected for finite-geometry and multiple-scattering effects using a Monte Carlo simulation of the experiment. The 22.5-MeV data demonstrate that the three-nucleon analyzing power puzzle also exists at this energy. They show a significant discrepancy with predictions of high-precision nucleon-nucleon potentials alone or combined with Tucscon-Melbourne or Urbana IX three-nucleon forces, as well as currently available effective-field theory based potentials of next-to-next-to-next-to-leading order.

G. J. Weisel; W. Tornow; A. S. Crowell; J. H. Esterline; G. M. Hale; C. R. Howell; P. D. O'Malley; J. R. Tompkins; H. Wita?a

2014-05-12T23:59:59.000Z

291

A scintillating-fiber 14-MeV neutron detector on TFTR during DT operation  

SciTech Connect (OSTI)

A compact 14-MeV neutron detector using an array of scintillating fibers has been tested on the TFTR tokamak under conditions of a high gamma background. This detector uses a fiber-matrix geometry, a magnetic field-insensitive phototube with an active HV base and pulse-height discrimination to reject low-level pulses from 2.5 MeV neutron and intense gammas. Laboratory calibrations have been performed at EG&G Las Vegas using a pulsed DT neutron generator and a 30 kCi {sup 60}Co source as background, at PPPL using DT neutron sources, and at LANL using an energetic deuterium beam and target at a tandem Van de Graaff accelerator. During the first high power DT shots on TFTR in December 1993, the detector was 15.5 meters from the torus in a large collimator. For a rate of 1 {times} 10{sup 18} n/sec from the tokamak, it operated in an equivalent background of 1 {times} 10{sup 10} gammas/cm{sup 2}/sec ({approximately}4 mA current drain) at a DT count rate of 200 kHz.

Wurden, G.A.; Chrien, R.E.; Barnes, C.W.; Sailor, W.C. [Los Alamos National Lab., NM (United States); Roquemore, A.L. [Princeton Plasma Physics Lab., NJ (United States); Lavelle, M.J.; O`Gara, P.M.; Jordan, R.J. [EG& G Energy Measurements, Las Vegas, NV (United States)

1994-07-01T23:59:59.000Z

292

Elastic Scattering of Protons by Deuterium Between 15 and 20 MeV  

Science Journals Connector (OSTI)

Differential cross sections for elastic scattering of protons by deuterium have been measured at laboratory energies of 14.9, 15.5, 16.2, 17.1, 18.5, 19.0, 19.6, and 19.9 MeV. 17 angles between 21.8 and 150.9° c.m. were included in each distribution. Nine of the angles represent the zeros of the Legendre polynomials through l=4. Relative errors were about 0.8% on the average, and absolute errors were about 1.8%. In addition, relative angular distributions were taken at 16.2, 17.1, 18.5, and 19.1 MeV, including 51 angles between 9.8 and 167.0° c.m. These were normalized to the absolute data at c.m. angles between 30 and 54° and are in good agreement at the remaining angles. Smooth curves can be drawn through the data and no indications of strong resonant behavior are found in this energy range.

T. A. Cahill; J. Greenwood; H. Willmes; D. J. Shadoan

1971-11-01T23:59:59.000Z

293

Baseline Design of a Solid Neutron Converter Driven by 160 MeV Protons  

E-Print Network [OSTI]

The European Isotope Separation On-Line Radioactive Ion Beam Facility Design Study (EURISOL DS) aims at the design of several spallation and fission targets for the production of radioactive isotopes. Namely, direct targets, where high-energy protons interact directly with the fission targets, as well as the design of a Multi-MW proton-to-neutron converter coupled with a fission target. For the later, several options have been proposed, including the use of a relatively low energy (in the hundreds of MeV) high intensity proton beam. In this scope, the neutronic characteristics of a tantalum n-converter/fission-target system have been established (although not yet optimised) for a reference proton energy of 160 MeV. A set of simulations has been carried out for different design requirements and different characteristics of the proton beam. An extensive comparison of the main physical parameters has also been carried out, in order to allow the optimal engineering design of the whole target station.

Herrera-Martínez, A

2006-01-01T23:59:59.000Z

294

Office of Nuclear Safety  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Office of Nuclear Safety (HS-30) Office of Nuclear Safety (HS-30) Office of Nuclear Safety Home » Directives » Nuclear and Facility Safety Policy Rules » Nuclear Safety Workshops Technical Standards Program » Search » Approved Standards » Recently Approved » RevCom for TSP » Monthly Status Reports » Archive » Feedback DOE Nuclear Safety Research & Development Program Office of Nuclear Safety Basis & Facility Design (HS-31) Office of Nuclear Safety Basis & Facility Design - About Us » Nuclear Policy Technical Positions/Interpretations » Risk Assessment Working Group » Criticality Safety » DOE O 420.1C Facility Safety » Beyond Design Basis Events Office of Nuclear Facility Safety Programs (HS-32) Office of Nuclear Facility Safety Programs - About Us

295

The Joys of Nuclear Engineering  

ScienceCinema (OSTI)

Nuclear fuels researcher Jon Carmack talks about the satisfactions of a career in nuclear engineering.

Jon Carmack

2010-01-08T23:59:59.000Z

296

Nuclear reactor  

DOE Patents [OSTI]

A nuclear reactor comprising a cylindrical pressure vessel, an elongated annular core centrally disposed within and spaced from the pressure vessel, and a plurality of ducts disposed longitudinally of the pressure vessel about the periphery thereof, said core comprising an annular active portion, an annular reflector just inside the active portion, and an annular reflector just outside the active a portion, said annular active portion comprising rectangular slab, porous fuel elements radially disposed around the inner reflector and extending the length of the active portion, wedge-shaped, porous moderator elements disposed adjacent one face of each fuel element and extending the length of the fuel element, the fuel and moderator elements being oriented so that the fuel elements face each other and the moderator elements do likewise, adjacent moderator elements being spaced to provide air inlet channels, and adjacent fuel elements being spaced to provide air outlet channels which communicate with the interior of the peripheral ducts, and means for introducing air into the air inlet channels which passes through the porous moderator elements and porous fuel elements to the outlet channel.

Thomson, Wallace B. (Severna Park, MD)

2004-03-16T23:59:59.000Z

297

Nuclear thermodynamics from chiral low-momentum interactions  

E-Print Network [OSTI]

We investigate the thermodynamic equation of state of isospin-symmetric nuclear matter with microscopic nuclear forces derived within the framework of chiral effective field theory. Two- and three-body nuclear interactions constructed at low resolution scales form the basis for a perturbative calculation of the finite-temperature equation of state. The nuclear force models and many-body methods are benchmarked against bulk properties of isospin-symmetric nuclear matter at zero temperature, which are found to be well reproduced when chiral nuclear interactions constructed at the lowest resolution scales are employed. The calculations are then extended to finite temperatures, where we focus on the liquid-gas phase transition and the associated critical point. The Maxwell construction is applied to construct the physical equation of state, and the value of the critical temperature is determined to be T_c =17.2-19.1 MeV, in good agreement with the value extracted from multifragmentation reactions of heavy ions.

Wellenhofer, Corbinian; Kaiser, Norbert; Weise, Wolfram

2014-01-01T23:59:59.000Z

298

Nuclear thermodynamics from chiral low-momentum interactions  

E-Print Network [OSTI]

We investigate the thermodynamic equation of state of isospin-symmetric nuclear matter with microscopic nuclear forces derived within the framework of chiral effective field theory. Two- and three-body nuclear interactions constructed at low resolution scales form the basis for a perturbative calculation of the finite-temperature equation of state. The nuclear force models and many-body methods are benchmarked against bulk properties of isospin-symmetric nuclear matter at zero temperature, which are found to be well reproduced when chiral nuclear interactions constructed at the lowest resolution scales are employed. The calculations are then extended to finite temperatures, where we focus on the liquid-gas phase transition and the associated critical point. The Maxwell construction is applied to construct the physical equation of state, and the value of the critical temperature is determined to be T_c =17.2-19.1 MeV, in good agreement with the value extracted from multifragmentation reactions of heavy ions.

Corbinian Wellenhofer; Jeremy W. Holt; Norbert Kaiser; Wolfram Weise

2014-04-08T23:59:59.000Z

299

Research in heavy-ion nuclear physics. Annual progress report, May 1, 1992--April 30, 1993  

SciTech Connect (OSTI)

Attention was focused on the fission process in light nuclear systems. A model calculation based on the transition-state model of nuclear fission was applied to {sup 47}V fission as populated through multiple entrance channels and to fusion-fission cross sections for production of {sup 28}Al through three different entrance channels. Angular distributions are shown for different mass channels of the {sup 29}Si+{sup 27}Al reaction at E{sub lab} = 125 MeV. Pronounced structure is seen in the symmetric and near-symmetric fission channels from the {sup 24}Mg+{sup 24}Mg reaction; cross sections for binary fragment emission are shown for E{sub lab} = 90 MeV. A large Bragg-curve detector was used in this experiment. Ways to optimize detector response were studied; in addition, the Bragg detector was instrumented with an internal position-sensitive multiwire proportional counter.

Sanders, S.J.; Prosser, F.W.

1992-01-01T23:59:59.000Z

300

Spectral Structure of Electron Antineutrinos from Nuclear Reactors  

E-Print Network [OSTI]

Recent measurements of the positron energy spectrum obtained from inverse beta decay interactions of reactor electron antineutrinos show an excess in the 4 to 6 MeV region relative to current predictions. First-principle calculations of fission and beta decay processes within a typical pressurized water reactor core identify prominent fission daughter isotopes as a possible origin for this excess. These calculations also predict percent-level substructure in the antineutrino spectrum due to Coulomb effects in beta decay. Precise measurement of this substructure can constrain nuclear reactor physics. The substructure can be a systematic uncertainty for measurements utilizing the detailed spectral shape.

D. A. Dwyer; T. J. Langford

2014-07-04T23:59:59.000Z

Note: This page contains sample records for the topic "mev cm-1 nuclear" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

Binding Energy of a ? Particle in Nuclear Matter  

Science Journals Connector (OSTI)

The binding energy of a ? particle in nuclear matter, B?(?), is calculated using a ?-nucleon two-body potential with a hard core, which reproduces the binding energies of light hypernuclei and the ?-nucleon scattering at intermediate energies. The simplified version of the Brueckner theory used in previous calculations is applied. The effective mass of the ? particle, M?*, is estimated to be about 0.9 M?. The rearrangement energy is included in the calculation. The result obtained, B?(?)?31 MeV, is in good agreement with the measured value.

Janusz Dabrowski and H. S. Köhler

1964-10-12T23:59:59.000Z

302

Advanced nuclear fuel  

SciTech Connect (OSTI)

Kurt Terrani uses his expertise in materials science to develop safer fuel for nuclear power plants.

Terrani, Kurt

2014-07-14T23:59:59.000Z

303

TVA chooses nuclear power  

Science Journals Connector (OSTI)

TVA chooses nuclear power ... In giving the nod to a nuclear (over a coal) power generating station 10 days ago, TVA probably gave nuclear power its biggest boost to date. ... The $247 million nuclear power plant—a dual boiling-water reactor unit with a total capacity of 2.2 million kw(e).—will ...

1966-06-27T23:59:59.000Z

304

TERRORISM AND NUCLEAR POWER  

Science Journals Connector (OSTI)

TERRORISM AND NUCLEAR POWER ... The attacks of Sept. 11 raise fear that U.S. nuclear power plants may be vulnerable ... THE TERRORIST ATTACKS ON THE World Trade Center and Pentagon are forcing a reexamination of the security of the nation's 103 nuclear power plants by nuclear's advocates and foes alike. ...

JEFF JOHNSON

2001-10-08T23:59:59.000Z

305

Nuclear Science & Engineering  

E-Print Network [OSTI]

. 1 Nuclear Science & Engineering Nuclear Energy Present and Future Ian H. Hutchinson Head, Department of Nuclear Science and Engineering CoPrincipal, Alcator Tokamak Project, Plasma Science and Fusion Center Massachusetts Institute of Technology Outline: Nuclear Power in the US and the World Limitations

306

SPOTLIGHT ON NUCLEAR POWER  

Science Journals Connector (OSTI)

SPOTLIGHT ON NUCLEAR POWER ... TOUGHER RULES are needed to improve the safety of U.S. nuclear power facilities and to better protect the public from the type of disaster that occurred this spring at Japan’s Fukushima Daiichi nuclear energy plant, says a preliminary report released by the Nuclear Regulatory Commission (NRC) on July 12. ...

GLENN HESS

2011-07-18T23:59:59.000Z

307

Advanced nuclear fuel  

ScienceCinema (OSTI)

Kurt Terrani uses his expertise in materials science to develop safer fuel for nuclear power plants.

Terrani, Kurt

2014-07-15T23:59:59.000Z

308

Nuclear Waste: Knowledge Waste?  

Science Journals Connector (OSTI)

...06520, USA. Nuclear power is re-emerging...proclaiming a “nuclear renaissance...example, plant safety...liabilities, terrorism at plants and in transport...high-level nuclear wastes (HLW...factor in risk perceptions...supporting nuclear power in the abstract...

Eugene A. Rosa; Seth P. Tuler; Baruch Fischhoff; Thomas Webler; Sharon M. Friedman; Richard E. Sclove; Kristin Shrader-Frechette; Mary R. English; Roger E. Kasperson; Robert L. Goble; Thomas M. Leschine; William Freudenburg; Caron Chess; Charles Perrow; Kai Erikson; James F. Short

2010-08-13T23:59:59.000Z

309

Global Nuclear Energy Partnership Fact Sheet - Develop Enhanced Nuclear  

Broader source: Energy.gov (indexed) [DOE]

Global Nuclear Energy Partnership Fact Sheet - Develop Enhanced Global Nuclear Energy Partnership Fact Sheet - Develop Enhanced Nuclear Safeguards Global Nuclear Energy Partnership Fact Sheet - Develop Enhanced Nuclear Safeguards GNEP will help prevent misuse of civilian nuclear facilities for nonpeaceful purposes by developing enhanced safeguards programs and technologies. International nuclear safeguards are integral to implementing the GNEP vision of a peaceful expansion of nuclear energy and demonstration of more proliferation-resistant fuel cycle technologies. Global Nuclear Energy Partnership Fact Sheet - Develop Enhanced Nuclear Safeguards More Documents & Publications GNEP Element:Develop Enhanced Nuclear Safeguards Global Nuclear Energy Partnership Fact Sheet Global Nuclear Energy Partnership Fact Sheet - Demonstrate Small-Scale

310

Nuclear activation measurements of High energy deuterons from a small plasma focus  

Science Journals Connector (OSTI)

High-energy deuterons from a small (1.7 kJ) plasma focus device were studied by nuclear activation of a boron-carbide target. The ratio of 10B( d , n )11C and 12C( d , n )13N yields indicates a deuteron spectrum decreasing rapidly between 400 keV and 1 MeV. This spectrum could take the form of d N d / d E ? E ? n with n ? 9 .

M.V. Roshan; S.V. Springham; A.R. Talebitaher; R.S. Rawat; P. Lee

2009-01-01T23:59:59.000Z

311

NUCLEAR MATERIALTRANSACTION REPORT | Department of Energy  

Energy Savers [EERE]

NUCLEAR MATERIALTRANSACTION REPORT NUCLEAR MATERIALTRANSACTION REPORT Form used to support nuclear materials accountability and control. NUCLEAR MATERIALTRANSACTION REPORT More...

312

Nuclear Science and Engineering | ornl.gov  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Supporting Organizations Nuclear Science Engineering Nuclear Science Home | Science & Discovery | Nuclear Science | Supporting Organizations | Nuclear Science Engineering SHARE...

313

Brueckner-Bethe and variational calculations of nuclear matter  

Science Journals Connector (OSTI)

Results of both Brueckner-Bethe and variational calculations for the binding energy of nuclear matter as a function of density are presented for several recent nucleon-nucleon potentials. A detailed comparison is made for the Argonne v14 potential, the most realistic potential for which both methods have been used. The two methods agree reasonably well, with predicted saturation points of -17.8 MeV at 1.6 fm-1 for the Brueckner-Bethe method, and -16.6 MeV at 1.7 fm-1 for the variational method. The variational energies are 1–2 MeV above the Brueckner-Bethe energies for densities from 1.2 to 1.7 fm-1. The results of Brueckner-Bethe calculations are also given for the Paris and Bonn potentials as well as results of variational calculations for the Urbana v14 potential. These potentials all give similar binding energy curves, and all saturate matter at a density significantly above the empirical value.

B. D. Day and R. B. Wiringa

1985-09-01T23:59:59.000Z

314

Entropy in central Au+Au reactions between 100 and 400A MeV  

Science Journals Connector (OSTI)

The ratio of the total charge bound in fragments with Z between 2 and 15 to the hydrogen yield, (tsum215MiZi)/MH, has been measured, and the neutron-to-proton ratio n/p has been estimated from the data of central Au + Au reactions between 100 and 400A MeV, measured with the phase I setup of the detector system FOPI and GSI, Darmstadt, in the polar-angle range between 7° and 30°. These two quantities were used to determine the entropy per nucleon S/A by comparing them with the predictions of the freesco code. The analysis allows the simulataneous extraction of the values of the baryonic entropy, temperature, and collective flow. The extracted values are in good agreement with the values obtained in earlier FOPI studies, and, for the baryonic entropy, with recent hydrodynamic calculations.

M. Dželalija et al.

1995-07-01T23:59:59.000Z

315

The mechanical design of a proton microscope for radiography at 800 MeV  

SciTech Connect (OSTI)

A proton microscope has been developed for radiography applications using the 800-MeV linear accelerator at the Los Alamos Neutron Science Center (LANSCE). The microscope provides a magnified image of a static device, or of a dynamic event such as a high-speed projectile impacting a target. The microscope assembly consists primarily of four Permanent Magnet Quadrupoles (PMQ's) that are supported on movable platforms. The platform supports, along with the rest of the support structure, are designed to withstand the residual dynamic loads that are expected from the dynamic tests. This paper covers the mechanical design of the microscope assembly, including the remote positioning system that allows for fine-tuning the focus of an object being imaged.

Valdiviez, R. (Robert); Sigler, F. E. (Floyd E.); Barlow, D. B. (David B.); Blind, B. (Barbara); Jason, A. J. (Andrew J.); Mottershead, C. T.; Gomez, J. J. (John J.); Espinoza, C. J. (Camilo J.)

2003-01-01T23:59:59.000Z

316

The Scattering of 4.5- and 5.5-Mev Neutrons by Deuterons  

Science Journals Connector (OSTI)

By bombarding a thin deuterium gas target with deuterons 4.5- and 5.5-Mev neutrons were produced. Deuterons recoiling from neutron collisions in (a) a thin heavy paraffin scatterer and (b) a gas sample were detected by a double coincidence counter telescope. The angular distribution of recoiling deuterons, measured from 0° to 60° in the laboratory system, shows a sharp maximum for neutron scattering at 180° with a minimum at approximately 110° in the center-of-mass system. The ratio of the differential cross section at 180° to that at 110° is 5:1 for both energies. The experimental curves are compared with the theory of Buckingham and Massey.

E. Wantuch

1951-10-15T23:59:59.000Z

317

The Angular Distribution of Protons from the D—D Reaction at 10 Mev  

Science Journals Connector (OSTI)

The gas-filled scattering chamber has been applied to the study of the distribution in angle of the protons from the D—D reaction with 9.94±0.08-Mev deuterons from the cyclotron. Photographic plates were used as detectors. The other charged particles produced in the reaction and from scattering processes were prevented from reaching the emulsion by covering the photographic plates with a 53.2-mg/cm2 aluminum foil. Differential cross sections were determined at 10° intervals from 15° to 65° in the laboratory system. Background runs were made to determine the correction necessary because of the flux of neutrons in the chamber. Additional corrections were made for the penetration of the protons through the edges of the defining slit and for geometrical errors. The total cross section for the production of protons was calculated to be 7.3×10-26 cm2.

H. A. Leiter; F. A. Rodgers; P. G. Kruger

1950-06-15T23:59:59.000Z

318

Ductility loss of ion-irradiated zircaloy-2 in iodine. [55 MeV alpha particles  

SciTech Connect (OSTI)

An ion bombardment simulation technique for neutron irradiation was applied to 'thick' materials to study the effect of radiation damage on the ductility change in Zircaloy-2 in an iodine environment. Specimens were prepared from actual cladding tubes and, prior to the irradiation, they were heat-treated in vacuo at 450, 580, and 700/degree/C for 2 h. Irradiation was performed by 52-MeV alpha particles up to the 0.32 displacements per atom (dpa) at 340/degree/C. Ductility loss begins to appear after 0.03 dpa irradiation, both in iodine and argon gas environments. The iodine presence resulted in ductility reduction, compared with the argon result in all irradiation dose ranges examined. The stress applied during irradiation caused ductility loss to commence at lower dosage than in the case of stress-free irradiation. These results are discussed in relation to the existing stress corrosion cracking models.

Shimada, M.; Terasawa, M.; Yamamoto, S.; Kamei, H.; Koizumi, K.

1981-01-01T23:59:59.000Z

319

Magnetic field calculation for a 10 MeV positron emission tomography cyclotron  

SciTech Connect (OSTI)

The magnetic field calculation and correction for a 10 MeV positron emission tomography cyclotron is presented. 3D TOSCA analysis results are compared with the measured data, and the calculation error is used to calibrate the B-H curve to obtain a very precise finite element method estimator, which is used to predict the correction of the magnet pole for achieving the isochronous field. The isochronous field error is approximated with the effects of a set of standard patches. On the assumption that the effect of each small patch is proportional to its surface, the correction of the magnet pole is found by solving a system of equations using the least square scheme. The magnet shimming is performed and the measured magnetic field is found in good agreement with the prediction, with an error less than 2 G.

Chen Dezhi; Liu Kaifeng; Yang Jun; Li Dong; Qin Bin; Xiong Yongqian [State Key Lab of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074 (China); Chen Zihao [Central Southern Electrical Power Design Institute, Wuhan 430071 (China)

2013-05-15T23:59:59.000Z

320

(D,he-2) Reactions at E(d)=125.2 Mev  

E-Print Network [OSTI]

We have measured cross sections for (d, He-2) induced reactions on the p-shell nuclei Li-6, C-12, and C-13 and the sd-shell nucleus Mg-24 at an energy of E(d)=125.2 MeV. The measured excitation energy spectra are very similar to those from (p, n), (n, p), and (d, He-Z) reactions at higher energies. The measured 0 degrees (d, He-2) cross sections show a remarkably well-defined linear relation with...the Gamow-Teller strengths deduced either from beta decay or from (p, n) reactions. Our results demonstrate that the (d, He-2) reaction can be used as a powerful tool to study Gamow-Teller strengths in the beta(+) direction at energies as low as E...

Xu, HM; Ajupova, G. K.; Betker, A. C.; Gagliardi, Carl A.; Kokenge, B.; Lui, YW; Zaruba, A. F.

1995-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "mev cm-1 nuclear" 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

Inclusive inelastic reaction np?pX at 795 MeV  

Science Journals Connector (OSTI)

The inclusive reaction np?pX, where X includes a pion, has been studied at 795 MeV with measurements of the cross section d2?dp d?. Proton momentum spectra were measured for laboratory angles between 0° and 31°. These angles cover the full forward hemisphere in the center-of-mass system and give, with the use of symmetry assumptions, a value for the total reaction cross section, ?R=11.0±0.8 mb, exclusive of the np?d?0 reaction. The data are also presented as measurements of the cross section d2?dt dM, where t is the four-momentum transfer squared and M is the invariant missing mass. The results are compared with a model calculation of one-pion exchange that includes ? and ? exchange. The t dependence is also discussed in terms of a statistical model.

G. Glass; Mahavir Jain; L. C. Northcliffe; C. L. Hollas; C. R. Newsom; P. J. Riley; B. E. Bonner; J. E. Simmons

1983-09-01T23:59:59.000Z

322

Forward-to-backward asymmetry of the (?,n) reaction in the energy range 20–30 MeV  

Science Journals Connector (OSTI)

The forward-to-backward asymmetry of neutrons emitted in the (?,n) reactions on Pbnat and Cdnat targets was measured for photons in the range of 20–30 MeV, where the isovector quadrupole giant resonance is expected to lie. The asymmetry was observed to increase from small values (?0.2) to large ones (?0.6 and 0.8) for Cdnat and Pbnat, respectively. This phenomenon is interpreted as the interference between E1 and E2 amplitudes. From an analysis of the asymmetry the excitation energies of the E2 isovector resonances were estimated to be 23.5±1.5 MeV and 26.5±1.5 MeV for the Pb and Cd nuclei, respectively. The E2 isovector resonances are found to be considerably wider than the E1 resonances.

T. Murakami; I. Halpern; D. W. Storm; P. T. Debevec; L. J. Morford; S. A. Wender; D. H. Dowell

1987-02-01T23:59:59.000Z

323

Experimental and calculated excitation functions for discrete-line gamma-ray production due to 1-40 MeV neutron interactions with sup 56 Fe  

SciTech Connect (OSTI)

Measuring cross sections for gamma-ray production from tertiary reactions is one of the ways to gain experimental information about these reactions. To this end, inelastic and other nonelastic neutron interactions with {sup 56}Fe have been studied for incident neutron energies between 0.8 and 41 MeV. An iron sample isotopically enriched in the mass 56 isotope was used. Gamma rays representing 70 transitions among levels in residual nuclei were identified, and production cross sections were deduced. The reactions studies were {sup 56}Fe(n,n{prime}){sup 56}Fe, {sup 56}Fe(n,p){sup 56}Mn, {sup 56}Fe(n,2n){sup 55}Fe, {sup 56}Fe(n,d + n,np){sup 55}Mn, {sup 56}Fe(n, t + n, nd + n,2np){sup 54}Mn, {sup 56}Fe(n,{alpha}){sup 53}Cr, {sup 56}Fe(n,n{alpha}){sup 52}Cr, and {sup 56}Fe(n,3n){sup 54}Fe. Experimental excitation functions have been compared with cross sections calculated using the nuclear reaction model code TNG, with generally favorable results. 24 refs., 2 figs.

Dickens, J.K.; Fu, C.Y.; Hetrick, D.M.; Larson, D.C.; Todd, J.H.

1991-01-01T23:59:59.000Z

324

New calculation for the neutron-induced fission cross section of Pa233 between 1.0 and 3.0MeV  

Science Journals Connector (OSTI)

The Pa233(n,f) cross section, a key ingredient for fast reactors and accelerators driven systems, was measured recently with relatively good accuracy [F. Tovesson et al., Phys. Rev. Lett. 88, 062502 (2002)]. The results are at strong variance with accepted evaluations and an existing indirect experiment. This circumstance led us to perform a quite detailed and complete evaluation of the Pa233(n,f) cross section between 1.0 and 3.0MeV, where use of our newly developed routines for the parametrization of the nuclear surface and the calculation of deformation parameters and level densities (including low-energy discrete levels) were made. The results show good quantitative and excellent qualitative agreement with the experimental direct data obtained by Tovesson et al. [F. Tovesson et al., Phys. Rev. Lett. 88, 062502 (2002)]. Additionally, our methodology opens new possibilities for the analysis of subthreshold fission and above threshold second-chance fission for both Pa233 and its decay product U233, as well as other strategically important fissionable nuclides.

J. Mesa; J. D. T. Arruda-Neto; A. Deppman; V. P. Likhachev; M. V. Manso; C. E. Garcia; O. Rodriguez; F. Guzmán; F. Garcia

2003-11-20T23:59:59.000Z

325

IOP PUBLISHING and INTERNATIONAL ATOMIC ENERGY AGENCY NUCLEAR FUSION Nucl. Fusion 50 (2010) 095005 (15pp) doi:10.1088/0029-5515/50/9/095005  

E-Print Network [OSTI]

IOP PUBLISHING and INTERNATIONAL ATOMIC ENERGY AGENCY NUCLEAR FUSION Nucl. Fusion 50 (2010) 095005 of these papers can be found in issue 3 2010 of Nuclear Fusion http://iopscience.iop.org/0029-5515/50/3/039901. b) in the energy range 0.5�1 MeV. The total power input will be in the 30�40 MW range under different plasma

Vlad, Gregorio

326

Inelastic interaction induced by high-energy muons (6 GeV, 12 GeV) at low momentum-transfer in nuclear emulsion  

Science Journals Connector (OSTI)

Inelastic scattering of 6 and 12 GeV muons has been studied in Ilford K5 nuclear emulsions. For energy transfers greater than 150 MeV (for ?...2..., the cross-sections are respectively (11.1±1.4) ?b/nucleon at 12...

J. C. Montret; B. Coupat; B. Michel; F. Vazeille

1972-01-01T23:59:59.000Z

327

Neutron-Deuteron and Neutron-Neutron Total Cross Sections in the Range 25-60 MeV  

Science Journals Connector (OSTI)

Measurements of the n-d total cross section to a precision of 1% are reported for the energy range 25-60 MeV. Nearly monoenergetic neutron beams were used whose energy was determined to about ±100 keV. The experimental values of ?nd for energies ?36 MeV are several percent larger than previous measurements in this range. Assuming charge symmetry, ?nn can be calculated from the T=1 phase shifts. The differences between experimental values of (?nd-?np) and ?nn calculations are small and fairly well accounted for by correction terms based on the method of Glauber.

F. P. Brady; W. J. Knox; R. L. Walraven; J. L. Romero

1972-10-01T23:59:59.000Z

328

Analyzing Power for He-4(n-],N)he-4 Elastic-Scattering at 50.4 Mev  

E-Print Network [OSTI]

, Texas 77843 (Received 10 September 1982) The analyzing power A~(0) for elastic scattering of neutrons by He has been measured for eight angles in the range 80'&O~,b&150' at 50.4 MeV. A polarized neutron beam (p?=0.50) was produced through bombardment... neutron polarimeter, and measurements of A~(8) are impor- tant for its calibration. In the past twenty years or so, extensive n- He analyzing power measurements have been made at numerous energies below 20 MeV, but the analyzing power values used...

York, R. L.; Hiebert, John C.; Woolverton, H. L.; Northcliffe, L. C.

1983-01-01T23:59:59.000Z

329

Further evidence for the broad 2{sub 2}{sup +} state at 9.6 MeV in {sup 12}C  

SciTech Connect (OSTI)

We measured the {sup 12}C(p,p{sup '}){sup 12}C* reaction at 25 MeV at the three laboratory angles of 20 deg., 35 deg., and 45 deg. The measured spectra support recent evidence for a new broad2{sub 2}{sup +} state at 9.6 MeV in {sup 12}C, but do not support the claim for such a broad state at 11.1 MeV.

Zimmerman, W. R.; Destefano, N. E.; Gai, M. [Laboratory for Nuclear Science at Avery Point, University of Connecticut, Groton, Connecticut 06340-6097 (United States); WNSL, Department of Physics, Yale University, New Haven, Connecticut 06520-8124 (United States); Freer, M. [School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT (United Kingdom); Smit, F. D. [iThemba LABS, P.O. Box 722, Somerset West 7129 (South Africa)

2011-08-15T23:59:59.000Z

330

Nuclear Structure Aspects in Nuclear Astrophysics  

SciTech Connect (OSTI)

Nuclear Astrophysics as a broad and diverse field of study can be viewed as a magnifier of the impact of microscopic processes on the evolution of macroscopic events. One of the primary goals in Nuclear Astrophysics is the understanding of the nucleosynthesis processes that take place in the cosmos and the simulation of the correlated stellar and explosive burning scenarios. These simulations are strongly dependent on the input from Nuclear Physics which sets the time scale for all stellar dynamic processes--from giga-years of stellar evolution to milliseconds of stellar explosions--and provides the basis for most of the signatures that we have for the interpretation of these events--from stellar luminosities, elemental and isotopic abundances to neutrino flux from distant supernovae. The Nuclear Physics input comes through nuclear structure, low energy reaction rates, nuclear masses, and decay rates. There is a common perception that low energy reaction rates are the most important component of the required nuclear physics input; however, in this article we take a broader approach and present an overview of the close correlation between various nuclear structure aspects and their impact on nuclear astrophysics. We discuss the interplay between the weak and the strong forces on stellar time scales due to the limitations they provide for the evolution of slow and rapid burning processes. The effects of shell structure in nuclei on stellar burning processes as well as the impact of clustering in nuclei is outlined. Furthermore we illustrate the effects of the various nuclear structure aspects on the major nucleosynthesis processes that have been identified in the last few decades. We summarize and provide a coherent overview of the impact of all aspects of nuclear structure on nuclear astrophysics.

Smith, Michael Scott [ORNL

2006-12-01T23:59:59.000Z

331

The Nuclear Revolution, Relative Gains, and International Nuclear Assistance  

E-Print Network [OSTI]

Organizations, accidents, and nuclear weapons. Princeton,the likelihood of a nuclear accident (Sagan 1993, 1995). “potential for a nuclear accident. Yet it seems implausible

Kroenig, Matthew

2006-01-01T23:59:59.000Z

332

Belgium Nuclear Security Summit: Fact Sheet | National Nuclear...  

National Nuclear Security Administration (NNSA)

Nuclear Security Summit: Fact Sheet | National Nuclear Security Administration People Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency...

333

Italy Nuclear Security Summit: Fact Sheet | National Nuclear...  

National Nuclear Security Administration (NNSA)

Nuclear Security Summit: Fact Sheet | National Nuclear Security Administration People Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency...

334

COLLOQUIUM: Nuclear Famine: The Threat to Humanity from Nuclear...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

MBG Auditorium COLLOQUIUM: Nuclear Famine: The Threat to Humanity from Nuclear Weapons Dr. Alan Robock Rutgers University A nuclear war between India and Pakistan, with...

335

The Nuclear Revolution, Relative Gains, and International Nuclear Assistance  

E-Print Network [OSTI]

nature of the nuclear recipient’s security environment. ThisKeywords: Nuclear weapons proliferation; security; securitynature of the nuclear recipient’s security environment. This

Kroenig, Matthew

2006-01-01T23:59:59.000Z

336

Tennessee Nuclear Profile - Watts Bar Nuclear Plant  

U.S. Energy Information Administration (EIA) Indexed Site

Watts Bar Nuclear Plant" "Unit","Summer capacity (mw)","Net generation (thousand mwh)","Summer capacity factor (percent)","Type","Commercial operation date","License expiration...

337

Wisconsin Nuclear Profile - Point Beach Nuclear Plant  

U.S. Energy Information Administration (EIA) Indexed Site

Point Beach Nuclear Plant" "Unit","Summer capacity (mw)","Net generation (thousand mwh)","Summer capacity factor (percent)","Type","Commercial operation date","License expiration...

338

Massachusetts Nuclear Profile - Pilgrim Nuclear Power Station  

U.S. Energy Information Administration (EIA) Indexed Site

Pilgrim Nuclear Power Station" "Unit","Summer capacity (mw)","Net generation (thousand mwh)","Summer cpacity factor (percent)","Type","Commercial operation date","License...

339

Arkansas Nuclear Profile - Arkansas Nuclear One  

U.S. Energy Information Administration (EIA) Indexed Site

Nuclear One" "Unit","Summer capacity (mw)","Net generation (thousand mwh)","Summer capacity factor (percent)","Type","Commercial operation date","License expiration date"...

340

Search for an exotic S = -2, Q = -2 baryon resonance at a mass near 1862 MeV in quasi-real photoproduction  

E-Print Network [OSTI]

at the CERN Super Proton Synchroton. A narrow peak at a mass of about 1862 MeV in the - - invariant mass

Note: This page contains sample records for the topic "mev cm-1 nuclear" 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

Search for an exotic S = -2, Q = -2 baryon resonance at a mass near 1862 MeV in quasireal photoproduction  

E-Print Network [OSTI]

at the CERN Super Proton Synchroton. A narrow peak at a mass of about 1862 MeV in the # - # - invariant mass

342

Nuclear Science at NERSC  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Accelerator Science Accelerator Science Astrophysics Biological Sciences Chemistry & Materials Science Climate & Earth Science Energy Science Engineering Science Environmental Science Fusion Science Math & Computer Science Nuclear Science Science Highlights NERSC Citations HPC Requirements Reviews Home » Science at NERSC » Nuclear Science Nuclear Science Experimental and theoretical nuclear research carried out at NERSC is driven by the quest for improving our understanding of the building blocks of matter. This includes discovering the origins of nuclei and identifying the forces that transform matter. Specific topics include: Nuclear astrophysics and the synthesis of nuclei in stars and elsewhere in the cosmos; Nuclear forces and quantum chromodynamics (QCD), the quantum field

343

Neutron and Nuclear Science News  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

News Recent news and events related to neutron and nuclear science at LANSCE. Neutron and Nuclear Science News Nuclear science observations and opportunities at the Los Alamos...

344

Nuclear & Radiological Activity Center (NRAC)  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Nuclear & Radiological Activity Center (NRAC) Where nuclear research and deployment capabilities come together to solve nuclear nonproliferation challenges. Skip Navigation Links...

345

NUCLEAR SCIENCE ANNUAL REPORT 1975  

E-Print Network [OSTI]

Gove and A. H. Wapstra, Nuclear Data Tables 11, 127 (1972).P. Jackson, Chalk River Nuclear Laboratories Report (1975)national Conference on Nuclear Structure and Spec­ troscopy,

Authors, Various

2010-01-01T23:59:59.000Z

346

Nuclear Energy University Programs (NEUP)  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

DOE-NE Fosters Novel International Investments in U.S. Nuclear Energy Research October 14, 2014 Nuclear energy is an international industry, but nuclear research and development...

347

Counterterrorism | National Nuclear Security Administration  

National Nuclear Security Administration (NNSA)

a unique Counterterrorism Counterterrorism Policy and CooperationNuclear Threat Science Office of Nuclear Threat Science The Office of Nuclear Threat Science is responsible...

348

Supporting Organizations | Nuclear Science | ORNL  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Educational Outreach Publications and Reports News and Awards Supporting Organizations Nuclear Science Engineering Fusion & Materials for Nuclear Systems Nuclear Science Home |...

349

Is Nuclear Energy the Solution?  

E-Print Network [OSTI]

009-0270-y Is Nuclear Energy the Solution? Milton H. Saier &in the last 50 years, nuclear energy subsidies have totaledadministration, the Global Nuclear Energy Partnership (GNEP)

Saier, Milton H.; Trevors, Jack T.

2010-01-01T23:59:59.000Z

350

Nuclear structure studies with medium energy probes. [Northwestern Univ  

SciTech Connect (OSTI)

Progress in the continuing program of experimental research in nuclear structure with medium-energy probes during the year 1979-1980 is reviewed, and the research activities planned for the year 1980-1981 are discussed. In the study of pion-induced reactions emphasis is placed on investigation of isovector characteristics of nuclear excitations and on double charge exchange reactions. Pion production studies form the major part of the program of experiments with proton beams of 400 to 800 MeV at LAMPF. Current emphasis is on the bearing of these investigations on di-baryon existence. The study of high-spin states and magnetic scattering constitute the main goals of the electron scattering program at Bates. Representative results are presented; completed work is reported in the usual publications. (RWR)

Seth, Kamal K.

1980-01-01T23:59:59.000Z

351

The Relativistic Dirac-Brueckner Approach to Asymmetric Nuclear Matter  

E-Print Network [OSTI]

The properties of asymmetric nuclear matter have been investigated in a relativistic Dirac-Brueckner-Hartree-Fock framework using the Bonn A potential. The components of the self-energies are extracted by projecting on Lorentz invariant amplitudes. Furthermore, the optimal representation scheme for the $T$ matrix, the subtracted $T$ matrix representation, is applied and the results are compared to those of other representation schemes. Of course, in the limit of symmetric nuclear matter our results agree with those found in literature. The binding energy $E_b$ fulfills the quadratic dependence on the asymmetry parameter and the symmetry energy is 34 MeV at saturation density. Furthermore, a neutron-proton effective mass splitting of $m_n^* < m_p^*$ is found. In addition, results are given for the mean-field effective coupling constants.

E. N. E. van Dalen; C. Fuchs; Amand Faessler

2004-07-21T23:59:59.000Z

352

The relativistic Dirac–Brueckner approach to asymmetric nuclear matter  

Science Journals Connector (OSTI)

The properties of asymmetric nuclear matter have been investigated in a relativistic Dirac–Brueckner–Hartree–Fock framework using the Bonn A potential. The components of the self-energies are extracted by projecting on Lorentz invariant amplitudes. Furthermore, the optimal representation scheme for the T-matrix, the subtracted T-matrix representation, is applied and the results are compared to those of other representation schemes. Of course, in the limit of symmetric nuclear matter our results agree with those found in literature. The binding energy E b fulfills the quadratic dependence on the asymmetry parameter and the symmetry energy is 34 MeV at saturation density. Furthermore, a neutron–proton effective mass splitting of m n * < m p * is found. In addition, results are given for the mean-field effective coupling constants.

E.N.E. van Dalen; C. Fuchs; Amand Faessler

2004-01-01T23:59:59.000Z

353

Nuclear thermodynamics and the in-medium chiral condensate  

E-Print Network [OSTI]

The temperature dependence of the chiral condensate in isospin-symmetric nuclear matter at varying baryon density is investigated using thermal in-medium chiral effective field theory. This framework provides a realistic approach to the thermodynamics of the correlated nuclear many-body system and permits calculating systematically the pion-mass dependence of the free energy per particle. One- and two-pion exchange processes, $\\Delta(1232)$-isobar excitations, Pauli blocking corrections and three-body correlations are treated up to and including three loops in the expansion of the free energy density. It is found that nuclear matter remains in the Nambu-Goldstone phase with spontaneously broken chiral symmetry in the temperature range $T\\lesssim 100\\,$MeV and at baryon densities at least up to about twice the density of normal nuclear matter, $2\\rho_0 \\simeq 0.3\\, $fm$^{-3}$. Effects of the nuclear liquid-gas phase transition on the chiral condensate at low temperatures are also discussed.

Salvatore Fiorilla; Norbert Kaiser; Wolfram Weise

2012-04-19T23:59:59.000Z

354

Constraining the density dependence of the nuclear symmetry energy from an X-ray bursting neutron star  

E-Print Network [OSTI]

Neutrons stars lighter than the Sun are basically composed of nuclear matter of density up to around twice normal nuclear density. In our recent analyses, we showed that possible simultaneous observations of masses and radii of such neutron stars could constrain $\\eta\\equiv(K_0L^2)^{1/3}$, a combination of the incompressibility of symmetric nuclear matter $K_0$ and the density derivative of the nuclear symmetry energy $L$ that characterizes the theoretical mass-radius relation. In this paper, we focus on the mass-radius constraint of the X-ray burster 4U 1724-307 given by Suleimanov et al. (2011). We therefrom obtain the constraint that $\\eta$ should be larger than around 130 MeV, which in turn leads to $L$ larger than around 110, 98, 89, and 78 MeV for $K_0=180$, 230, 280, and 360 MeV. Such a constraint on $L$ is more or less consistent with that obtained from the frequencies of quasi-periodic oscillations in giant flares observed in soft-gamma repeaters.

Sotani, Hajime; Oyamatsu, Kazuhiro

2015-01-01T23:59:59.000Z

355

Constraining the density dependence of the nuclear symmetry energy from an X-ray bursting neutron star  

E-Print Network [OSTI]

Neutrons stars lighter than the Sun are basically composed of nuclear matter of density up to around twice normal nuclear density. In our recent analyses, we showed that possible simultaneous observations of masses and radii of such neutron stars could constrain $\\eta\\equiv(K_0L^2)^{1/3}$, a combination of the incompressibility of symmetric nuclear matter $K_0$ and the density derivative of the nuclear symmetry energy $L$ that characterizes the theoretical mass-radius relation. In this paper, we focus on the mass-radius constraint of the X-ray burster 4U 1724-307 given by Suleimanov et al. (2011). We therefrom obtain the constraint that $\\eta$ should be larger than around 130 MeV, which in turn leads to $L$ larger than around 110, 98, 89, and 78 MeV for $K_0=180$, 230, 280, and 360 MeV. Such a constraint on $L$ is more or less consistent with that obtained from the frequencies of quasi-periodic oscillations in giant flares observed in soft-gamma repeaters.

Hajime Sotani; Kei Iida; Kazuhiro Oyamatsu

2015-01-08T23:59:59.000Z

356

Electron impact ionization: A new parameterization for 100 eV to 1 MeV electrons  

E-Print Network [OSTI]

Electron impact ionization: A new parameterization for 100 eV to 1 MeV electrons Xiaohua Fang,1 of the ionization rate in the Earth's atmosphere due to precipitating energetic electrons. Precipitating electrons the atmosphere. In this study, two electron transport models (whose validity has been verified by observations

Jackman, Charles H.

357

Non-invasive field measurements of soil water content using a pulsed 14 MeV neutron generator  

E-Print Network [OSTI]

Non-invasive field measurements of soil water content using a pulsed 14 MeV neutron generator S to the atmosphere. Soil water sensors routinely are used in applications such as research on crop production, water-3120, United States 1. Introduction Knowledge of soil water content is critical to agricultural, hydrological

Johnson, Peter D.

358

A system for differential neutron scattering experiments in the energy range from 0.5 to 20 MeV  

E-Print Network [OSTI]

A system for differential neutron scattering experiments in the energy range from 0.5 to 20 MeV F 2010 Accepted 15 April 2010 Available online 27 May 2010 Keywords: Scattering Neutron Benchmark dependent scattered neutron distributions. Scattering measurements were performed on carbon and molybdenum

Danon, Yaron

359

Three-dimensional morphology evolution of SiO2 patterned films under MeV ion irradiation  

E-Print Network [OSTI]

Three-dimensional morphology evolution of SiO2 patterned films under MeV ion irradiation Kan Otani Division of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138 Xi Chen Department of Civil Engineering and Engineering Mechanics, Columbia University, New York, New York 10027 John

Hutchinson, John W.

360

Cross sections for neutron-deuteron elastic scattering in the energy range 135–250 MeV  

E-Print Network [OSTI]

We report new measurements of the neutron-deuteron elastic scattering cross section at energies from 135 to 250 MeV and center-of-mass angles from 80[degrees] to 130[degrees]. Cross sections for neutron-proton elastic ...

Ertan, E.

Note: This page contains sample records for the topic "mev cm-1 nuclear" 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

Quasi-differential neutron scattering from 238 U from 0.5 to 20 MeV  

E-Print Network [OSTI]

Quasi-differential neutron scattering from 238 U from 0.5 to 20 MeV A.M. Daskalakis a, , R Measurement Neutron scattering Time-of-flight experiment Benchmark a b s t r a c t The Rensselaer Polytechnic scattering sample 30 m from the source. Eight liquid scintillator (EJ-301) proton recoil fast neutron

Danon, Yaron

362

Beam dynamics study of a 30?MeV electron linear accelerator to drive a neutron source  

SciTech Connect (OSTI)

An experimental neutron facility based on 32?MeV/18.47?kW electron linac has been studied by means of PARMELA simulation code. Beam dynamics study for a traveling wave constant gradient electron accelerator is carried out to reach the preferential operation parameters (E?=?30?MeV, P?=?18?kW, dE/E?MeV beam energy is obtained at the end of the linac. As high electron energy is required to produce acceptable neutron flux. The final neutron flux is estimated to be 5?×?10{sup 11}?n/cm{sup 2}/s/mA. Future development will be the real design of a 30?MeV electron linac based on S band traveling wave.

Kumar, Sandeep; Yang, Haeryong; Kang, Heung-Sik, E-mail: hskang@postech.ac.kr [Pohang Accelerator Laboratory, San31, Hyoja-dong, Pohang, Gyeongbuk 790-784 (Korea, Republic of)

2014-02-14T23:59:59.000Z

363

Excitation functions of $^{nat}$Pb(d,x)$^{206,205,204,203,202}$Bi, $^{203cum,202m,201cum}$Pb and $^{202cum,201cum}$Tl reactions up to 50 MeV  

E-Print Network [OSTI]

Cross-sections of deuteron induced nuclear reactions on lead were measured up to 50 MeV using the standard stacked foil irradiation technique and high resolution $\\gamma$-ray spectrometry. Experimental cross-sections and derived integral yields are presented for the $^{nat}$Pb(d,x)$^{206,205,204,203,202}$Bi, $^{203cum,202m,201cum}$Pb and $^{202cum,201cum}$Tl reactions. The experimental data were compared with the results from literature and with the data in the TENDL-2013 library (obtained with TALYS code). The cross-section data were analyzed also with the theoretical results calculated by using the ALICE-IPPPE-D and EMPIRE-D codes.

F. Ditrói; F. Tárkányi; S. Takács; A. Hermanne; A. V. Ignatyuk

2014-11-27T23:59:59.000Z

364

Constraints on the time-scale of nuclear breakup from thermal hard-photon emission  

E-Print Network [OSTI]

Measured hard photon multiplicities from second-chance nucleon-nucleon collisions are used in combination with a kinetic thermal model, to estimate the break-up times of excited nuclear systems produced in nucleus-nucleus reactions at intermediate energies. The obtained nuclear break-up time for the $^{129}${Xe} + $^{nat}${Sn} reaction at 50{\\it A} MeV is $\\Delta$$\\tau$ $\\approx$ 100 -- 300 fm/$c$ for all reaction centralities. The lifetime of the radiating sources produced in seven other different heavy-ion reactions studied by the TAPS experiment are consistent with $\\Delta$$\\tau$ $\\approx$ 100 fm/$c$, such relatively long thermal photon emission times do not support the interpretation of nuclear breakup as due to a fast spinodal process for the heavy nuclear systems studied.

R. Ortega; D. d'Enterria; G. Martinez; D. Baiborodin; H. Delagrange; J. Diaz; F. Fernandez; H. Loehner; T. Matulewicz; R. W. Ostendorf; S. Schadmand; Y. Schutz; P. Tlusty; R. Turrisi; V. Wagner; H. W. Wilschut; N. Yahlali

2005-08-26T23:59:59.000Z

365

CONSTRAINING THE SYMMETRY PARAMETERS OF THE NUCLEAR INTERACTION  

SciTech Connect (OSTI)

One of the major uncertainties in the dense matter equation of state has been the nuclear symmetry energy. The density dependence of the symmetry energy is important in nuclear astrophysics, as it controls the neutronization of matter in core-collapse supernovae, the radii of neutron stars and the thicknesses of their crusts, the rate of cooling of neutron stars, and the properties of nuclei involved in r-process nucleosynthesis. We show that fits of nuclear masses to experimental masses, combined with other experimental information from neutron skins, heavy ion collisions, giant dipole resonances, and dipole polarizabilities, lead to stringent constraints on parameters that describe the symmetry energy near the nuclear saturation density. These constraints are remarkably consistent with inferences from theoretical calculations of pure neutron matter, and, furthermore, with astrophysical observations of neutron stars. The concordance of experimental, theoretical, and observational analyses suggests that the symmetry parameters S{sub v} and L are in the range 29.0-32.7 MeV and 40.5-61.9 MeV, respectively, and that the neutron star radius, for a 1.4 M{sub Sun} star, is in the narrow window 10.7 km

Lattimer, James M. [Department of Physics and Astronomy, Stony Brook University, Stony Brook, NY 11794-3800 (United States); Lim, Yeunhwan, E-mail: james.lattimer@stonybrook.edu, E-mail: yeunhwan.lim@gmail.com [Department of Physics Education, Daegu University, Gyeongsan 712-714 (Korea, Republic of)

2013-07-01T23:59:59.000Z

366

Nuclear Energy Program  

Broader source: Energy.gov (indexed) [DOE]

April 15, 2002 April 15, 2002 NERAC Spring 2002 Meeting Office of Nuclear Energy, Science and Technology Magwood/April15_02 NERAC.ppt (2) 2002 Will Be A Transition Year 2002 Will Be A Transition Year 6 Nuclear Power 2010 6 Major Program Developments 6 FY 2003 Budget Request Office of Nuclear Energy, Science and Technology Magwood/April15_02 NERAC.ppt (3) Nuclear Power 2010 Nuclear Power 2010 Nuclear Power 2010 is a new R&D initiative announced by Secretary Abraham on February 14, 2002. This initiative is designed to clear the way for the construction of new nuclear power plants by 2010. Office of Nuclear Energy, Science and Technology Magwood/April15_02 NERAC.ppt (4) Can We Build New U.S. Reactors By 2010? Yes! Can We Build New U.S. Reactors By 2010? Yes! Can Be Deployed by 2010

367

Promulgating Nuclear Safety Requirements  

Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]

Applies to all Nuclear Safety Requirements Adopted by the Department to Govern the Conduct of its Nuclear Activities. Cancels DOE P 410.1. Canceled by DOE N 251.85.

1996-05-15T23:59:59.000Z

368

Nuclear energy in Argentina  

Science Journals Connector (OSTI)

After early interest in the possible uses of uranium in 1937, Argentina's scientists and politicians showed an inclination to support nuclear development that has kept quite steady compared with other areas. The Argentinean government prohibited the export of uranium in 1945, because of the emerging possibility of producing nuclear energy. The creation of the Atomic Energy Commission soon followed, and the first experimental reactor was set critical in 1958. Since then, nuclear development has allowed the successful operation of two nuclear power reactors, a quite integrated nuclear fuel cycle, and sustained activity in the development, production and use of radioisotopes. Nowadays an Argentinean company competes with success in the experimental nuclear reactor market. After a period in which the nuclear sector has been largely ignored in the official interest, Argentina's authorities have launched a comprehensive plan intended to rehabilitate all aspects of nuclear activity.

Gabriel N. Barcelo

2007-01-01T23:59:59.000Z

369

Nuclear Energy Production  

Science Journals Connector (OSTI)

We shall limit ourselves here to a very rough summary of the most important features of nuclear reactions in stars. This will suffice completely ... , while the study of particular aspects of nuclear astrophysics...

Professor Dr. Rudolf Kippenhahn…

1990-01-01T23:59:59.000Z

370

Marine Nuclear Propulsion  

Science Journals Connector (OSTI)

... June 30 about 95 qualified scientists and engineers were engaged on research and development on marine nuclear ... nuclear propulsion within his Department, including the Atomic Energy Authority and the Ship Research Association. This ...

1965-07-31T23:59:59.000Z

371

Nuclear Power Plants  

Science Journals Connector (OSTI)

A third issue related to the production, use and transportation of nuclear materials is the safety issue associated with ... an act of war or an act of terrorism. While the containment buildings of typical nuclear

Efstathios E. (Stathis) Michaelides

2012-01-01T23:59:59.000Z

372

Nuclear Engineer (Criticality Safety)  

Broader source: Energy.gov [DOE]

This position is located in the Nuclear Safety Division (NSD) which has specific responsibility for managing the development, analysis, review, and approval of non-reactor nuclear facility safety...

373

Nuclear Energy & Energy Security  

Science Journals Connector (OSTI)

Safety issues related to use of nuclear energy and secure operation of nuclear installations are mail stones of great importance. Although none of technologies producing energy are absolutely safe it is obvious t...

Jumber Mamasakhlisi

2010-01-01T23:59:59.000Z

374

On Nuclear Energy Levels  

Science Journals Connector (OSTI)

...research-article On Nuclear Energy Levels K. M. Guggenheimer The formula for the energy levels of the rigid rotator...nuclei. Two kinds of nuclear rotation are discussed...an A relation for the energy levels of different nuclei...

1942-01-01T23:59:59.000Z

375

Nuclear radiation actuated valve  

DOE Patents [OSTI]

A nuclear radiation actuated valve for a nuclear reactor. The valve has a valve first part (such as a valve rod with piston) and a valve second part (such as a valve tube surrounding the valve rod, with the valve tube having side slots surrounding the piston). Both valve parts have known nuclear radiation swelling characteristics. The valve's first part is positioned to receive nuclear radiation from the nuclear reactor's fuel region. The valve's second part is positioned so that its nuclear radiation induced swelling is different from that of the valve's first part. The valve's second part also is positioned so that the valve's first and second parts create a valve orifice which changes in size due to the different nuclear radiation caused swelling of the valve's first part compared to the valve's second part. The valve may be used in a nuclear reactor's core coolant system.

Christiansen, David W. (Kennewick, WA); Schively, Dixon P. (Richland, WA)

1985-01-01T23:59:59.000Z

376

General Engineer (Nuclear Safety)  

Broader source: Energy.gov [DOE]

The Chief of Nuclear Safety (CNS) reports the US/M&P; in serving as the Central Technical Authority (CTA) for M&P; activities, ensuring the Departments nuclear safety policies and...

377

NNSA: Working to Prevent Nuclear Proliferation | National Nuclear...  

National Nuclear Security Administration (NNSA)

to Prevent Nuclear Proliferation | National Nuclear Security Administration Facebook Twitter Youtube Flickr RSS People Mission Managing the Stockpile Preventing Proliferation...

378

Nuclear Weapons Testing Resumes | National Nuclear Security Administra...  

National Nuclear Security Administration (NNSA)

Testing Resumes | National Nuclear Security Administration People Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response...

379

The prediction of Neutron Elastic Scattering from Tritium for E(n) = 6-14 MeV  

SciTech Connect (OSTI)

In a recent report Navratil et al. evaluated the angle-integrated cross section and the angular distribution for 14-MeV n+T elastic scattering by inferring these cross sections from accurately measured p+3He angular distributions. This evaluation used a combination of two theoretical treatments, based on the no-core shell model and resonating-group method (NCSM/RGM) and on the R-matrix formalism, to connect the two charge-symmetric reactions n+T and p+{sup 3}He. In this report we extend this treatment to cover the neutron incident energy range 6-14 MeV. To do this, we evaluate angle-dependent correction factors for the NCSM/RGM calculations so that they agree with the p+{sup 3}He data near 6 MeV, and using the results found earlier near 14 MeV we interpolate these correction factors to obtain correction factors throughout the 6-14 MeV energy range. The agreement between the corrected NCSM/RGM and R-Matrix values for the integral elastic cross sections is excellent ({+-}1%), and these are in very good agreement with total cross section experiments. This result can be attributed to the nearly constant correction factors at forward angles, and to the evidently satisfactory physics content of the two calculations. The difference in angular shape, obtained by comparing values of the scattering probability distribution P({mu}) vs. {mu}(the cosine of the c.m. scattering angle), is about {+-}4% and appears to be related to differences in the two theoretical calculations. Averaging the calculations yields P({mu}) values with errors of {+-}2 1/2 % or less. These averaged values, along with the corresponding quantities for the differential cross sections, will form the basis of a new evaluation of n+T elastic scattering. Computer files of the results discussed in this report will be supplied upon request.

Anderson, J D; Dietrich, F S; Luu, T; McNabb, D P; Navratil, P; Quaglioni, S

2010-06-14T23:59:59.000Z

380

Nuclear power browning out  

SciTech Connect (OSTI)

When the sad history of nuclear power is written, April 26, 1986, will be recorded as the day the dream died. The explosion at the Chernobyl plant was a terrible human tragedy- and it delivered a stark verdict on the hope that nuclear power will one day replace fossil fuel-based energy systems. Nuclear advocates may soldier on, but a decade after Chernobyl it is clear that nuclear power is no longer a viable energy option for the twenty-first century.

Flavin, C.; Lenssen, N.

1996-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "mev cm-1 nuclear" 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

Nuclear Explosive Safety Manual  

Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]

This Manual provides supplemental details to support the requirements of DOE O 452.2D, Nuclear Explosive Safety.

2009-04-14T23:59:59.000Z

382

3D NUCLEAR SEGMENTAT  

Energy Science and Technology Software Center (OSTI)

003029WKSTN00 Delineation of nuclear structures in 3D multicellular systems  https://vision.lbl.gov/Software/3DMorphometry/ 

383

Preparing Non-nuclear Engineers for the Nuclear Field  

E-Print Network [OSTI]

Preparing Non-nuclear Engineers for the Nuclear Field Elizabeth K. Ervin The University. An understanding of power generation is important for all modern-day engineers, and nuclear energy serves as a good-four universities have nuclear- related programs, including Nuclear or Radiological Engineering, Nuclear Science

Ervin, Elizabeth K.

384

Nuclear Eclectic Power  

Science Journals Connector (OSTI)

...much higher future costs for oil and natural gas. However, the...ELECTRICITY GENERATION FROM COAL, OIL, AND NUCLEAR FUEL, NUCLEAR...electricity generation from coal, oil, and nuclear fuel, cite about...possibility that stimu-lated a marathon debate between the Union of...

David J. Rose

1974-04-19T23:59:59.000Z

385

Nuclear Power for Italy  

Science Journals Connector (OSTI)

ITALY HAS DECIDED to use British know-how to build its first big nuclear power plant. A.G.I.P. Nucleare, a subsidiary of the Italian government-owned petroleum organization, E.N.I., and Britain's Nuclear Power Plant Co. will sign final agreement next ...

1957-12-02T23:59:59.000Z

386

Catechism for nuclear power  

Science Journals Connector (OSTI)

... doses of radiation exposure are potentially harmful to people, and should be avoided. -"Nuclear power stations, and the nuclear industry in general, are sources of artificial radiation to which ... general, are sources of artificial radiation to which people may be exposed." Therefore nuclear power stations should not be built."Hither explain in no more than 250 words which ...

1986-07-31T23:59:59.000Z

387

Nuclear Physics with trapped  

E-Print Network [OSTI]

Nuclear Physics with trapped atoms and ions #12;2/2/2013Dan Melconian #12;2/2/2013Dan Melconian Outline · Scope and applications of nuclear physics precision frontier compliments LHC properties and aquifers in the Sahara #12;2/2/2013Dan Melconian What is Nuclear Physics? · Began with the study

Boas, Harold P.

388

NUCLEAR POWER in CALIFORNIA  

E-Print Network [OSTI]

NUCLEAR POWER in CALIFORNIA: 2007 STATUS REPORT CALIFORNIA ENERGY COMMISSION October 2007 CEC-100, California Contract No. 700-05-002 Prepared For: California Energy Commission Barbara Byron, Senior Nuclear public workshops on nuclear power. The Integrated Energy Policy Report Committee, led by Commissioners

389

Nuclear Lamins and Neurobiology  

Science Journals Connector (OSTI)

...August 2014 review-article Minireview Nuclear Lamins and Neurobiology Stephen G. Young...California, USA Much of the work on nuclear lamins during the past 15 years has focused...papers have identified important roles for nuclear lamins in the central nervous system...

Stephen G. Young; Hea-Jin Jung; John M. Lee; Loren G. Fong

2014-05-19T23:59:59.000Z

390

Nuclear Explosive Safety  

Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]

This Department of Energy (DOE) Order establishes requirements to implement the nuclear explosive safety (NES) elements of DOE O 452.1D, Nuclear Explosive and Weapon Surety Program, for routine and planned nuclear explosive operations (NEOs). Cancels DOE O 452.2C. Admin Chg 1, dated 7-10-13, cancels DOE O 452.2D.

2009-04-14T23:59:59.000Z

391

NUCLEAR PLANT AND CONTROL  

E-Print Network [OSTI]

for the digital protection systems of a nuclear power plant. When spec- ifying requirements for software and CRSA processes are described using shutdown system 2 of the Wolsong nuclear power plants as the digital, the missiles, and the digital protection systems embed- ded in nuclear power plants. Obviously, safety

392

Nuclear Explosive Safety  

Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]

This Order establishes requirements to implement the nuclear explosive safety elements of DOE O 452.1D, Nuclear Explosive and Weapon Surety Program, for routine and planned nuclear explosive operations. Cancels DOE O 452.2C. Admin Chg 1, 7-10-13

2009-04-14T23:59:59.000Z

393

Nuclear Research Reactors  

Science Journals Connector (OSTI)

... their countries for the advent of nuclear power. A few countries had built large research reactors for the production of isotopes and to study the behaviour of nuclear fuel, but ... production of isotopes and to study the behaviour of nuclear fuel, but the small training reactor had not been developed. Since then, research ...

T. E. ALLIBONE

1963-07-20T23:59:59.000Z

394

Nuclear Energy Institutes  

Science Journals Connector (OSTI)

Nuclear Energy Institutes ... The Atomic Energy Commission and the American Society for Engineering Education offer their nuclear energy courses for engineering and science teachers again in the summer of 1960. ... At least 160 college and university teachers will study nuclear science in the seven institutes scheduled. ...

1960-01-11T23:59:59.000Z

395

ENDF/B-VII.0: Next Generation Evaluated Nuclear Data Library for Nuclear Science and Technology  

SciTech Connect (OSTI)

We describe the next generation general purpose Evaluated Nuclear Data File, ENDF/B-VII.0, of recommended nuclear data for advanced nuclear science and technology applications. The library, released by the U.S. Cross Section Evaluation Working Group (CSEWG) in December 2006, contains data primarily for reactions with incident neutrons, protons, and photons on almost 400 isotopes. The new evaluations are based on both experimental data and nuclear reaction theory predictions. The principal advances over the previous ENDF/B-VI library are the following: (1) New cross sections for U, Pu, Th, Np and Am actinide isotopes, with improved performance in integral validation criticality and neutron transmission benchmark tests; (2) More precise standard cross sections for neutron reactions on H, {sup 6}Li, {sup 10}B, Au and for {sup 235,238}U fission, developed by a collaboration with the IAEA and the OECD/NEA Working Party on Evaluation Cooperation (WPEC); (3) Improved thermal neutron scattering; (4) An extensive set of neutron cross sections on fission products developed through a WPEC collaboration; (5) A large suite of photonuclear reactions; (6) Extension of many neutron- and proton-induced reactions up to an energy of 150 MeV; (7) Many new light nucleus neutron and proton reactions; (8) Post-fission beta-delayed photon decay spectra; (9) New radioactive decay data; and (10) New methods developed to provide uncertainties and covariances, together with covariance evaluations for some sample cases. The paper provides an overview of this library, consisting of 14 sublibraries in the same, ENDF-6 format, as the earlier ENDF/B-VI library. We describe each of the 14 sublibraries, focusing on neutron reactions. Extensive validation, using radiation transport codes to simulate measured critical assemblies, show major improvements: (a) The long-standing underprediction of low enriched U thermal assemblies is removed; (b) The {sup 238}U, {sup 208}Pb, and {sup 9}Be reflector biases in fast systems are largely removed; (c) ENDF/B-VI.8 good agreement for simulations of highly enriched uranium assemblies is preserved; (d) The underprediction of fast criticality of {sup 233,235}U and {sup 239}Pu assemblies is removed; and (e) The intermediate spectrum critical assemblies are predicted more accurately. We anticipate that the new library will play an important role in nuclear technology applications, including transport simulations supporting national security, nonproliferation, advanced reactor and fuel cycle concepts, criticality safety, medicine, space applications, nuclear astrophysics, and nuclear physics facility design. The ENDF/B-VII.0 library is archived at the National Nuclear Data Center, BNL. The complete library, or any part of it, may be retrieved from www.nndc.bnl.gov.

Chadwick, M B; Oblozinsky, P; Herman, M; Greene, N M; McKnight, R D; Smith, D L; Young, P G; MacFarlane, R E; Hale, G M; Haight, R C; Frankle, S; Kahler, A C; Kawano, T; Little, R C; Madland, D G; Moller, P; Mosteller, R; Page, P; Talou, P; Trellue, H; White, M; Wilson, W B; Arcilla, R; Dunford, C L; Mughabghab, S F; Pritychenko, B; Rochman, D; Sonzogni, A A; Lubitz, C; Trumbull, T H; Weinman, J; Brown, D; Cullen, D E; Heinrichs, D; McNabb, D; Derrien, H; Dunn, M; Larson, N M; Leal, L C; Carlson, A D; Block, R C; Briggs, B; Cheng, E; Huria, H; Kozier, K; Courcelle, A; Pronyaev, V; der Marck, S

2006-10-02T23:59:59.000Z

396

ANNOUNCEMENT NUCLEAR ENGINEERING FACULTY POSITION  

E-Print Network [OSTI]

ANNOUNCEMENT NUCLEAR ENGINEERING FACULTY POSITION The Department of Nuclear Engineering undergraduate and graduate courses in general nuclear engineering. The Knoxville campus of the University, Associate Professor of Nuclear Engineering; The University of Tennessee; 312 Pasqua Engineering Bldg

Tennessee, University of

397

Lateral propagation of MeV electrons generated by femtosecond laser irradiation  

Science Journals Connector (OSTI)

The propagation of MeV electronsgenerated by intense ( ? 10 20 ? W / cm 2 ) femtosecond laser irradiation in the lateral direction perpendicular to the incident laser beam was studied using targets consisting of irradiated metal wires and neighboring spectator wires embedded in electrically conductive (aluminum) or resistive (Teflon) substrates. The K shell spectra in the energy range 40–60 keV from wires of Gd Dy Hf and W were recorded by a transmission crystal spectrometer. The spectra were produced by 1s electron ionization in the irradiated wire and by energetic electron propagation through the substrate material to the spectator wire of a different metal. The electron range and energy were determined from the relative K shell emissions from the irradiated and spectator wires separated by varying substrate lateral distances of up to 1 mm. It was found that electron propagation through Teflon was inhibited compared to aluminum implying a relatively weak return current and incomplete space-charge neutralization. The energetic electron propagation in the direction parallel to the electric field of the laser beam was larger than perpendicular to the electric field. Energetic electron production was lower when directly irradiatingaluminum or Teflon compared to irradiating the heavy metal wires. These experiments are important for the determination of the energetic electron production mechanism and for understanding lateral electron propagation that can be detrimental to fast-ignition fusion and hard x-ray backlighter radiography.

J. F. Seely; C. I. Szabo; P. Audebert; E. Brambrink; E. Tabakhoff; L. T. Hudson

2010-01-01T23:59:59.000Z

398

Latent tracks in sapphire induced by 20-MeV fullerene beams  

Science Journals Connector (OSTI)

Single crystals of ?-Al2O3 were irradiated with 20-MeV fullerene beams in a fluence range from 1.0×1010 to 2.2×1011 C60+ cm-2. The cluster electronic stopping power (dE/dx)e was approximately 62 keV nm-1. Two complementary techniques were employed to assess the modifications induced by these irradiations: Rutherford-backscattering spectrometry in channeling geometry (RBS-C) and transmission electron microscopy (TEM). The disorder induced by electronic processes is clearly determined by the RBS-C analysis. A damage cross section Ae of about 2.2×10-12 cm2 has been extracted from the disorder kinetics, which corresponds to a track radius of ?8.5 nm. From lattice-disorder profiling, a maximal decorrelation length of the C60 clusters in the crystal was estimated to be ?150 nm. TEM micrographs exhibit cylindrical latent tracks formed around the projectile trajectory, while the high-resolution observations evidence the amorphization of sapphire in the core of these tracks. The present results have been interpretated within a model of high locally deposited energy densities in the cluster irradiation regime.

S. M. M. Ramos; N. Bonardi; B. Canut; S. Della-Negra

1998-01-01T23:59:59.000Z

399

Inspection of the objects on the sea floor by using 14 MeV tagged neutrons  

SciTech Connect (OSTI)

Variety of objects found on the sea floor needs to be inspected for the presence of materials which represent the threat to the environment and to the safety of humans. We have demonstrated that the sealed tube 14 MeV neutron generator with the detection of associated alpha particles can be used underwater when mounted inside ROV equipped with the hydraulic legs and variety of sensors for the inspection of such objects for the presence of threat materials. Such a system is performing the measurement by using the NaI gamma detector and an API-120 neutron generator which could be rotated in order to maximize the inspected target volume. The neutron beam intensity during the 10-30 min. measurements is usually 1 x 10{sup 7} n/s in 4{pi}. In this report the experimental results for some of commonly found objects containing TNT explosive or its simulant are presented. The measured gamma spectra are dominant by C, O and Fe peaks enabling the determination of the presence of explosives inside the ammunition shell. Parameters influencing the C/O ratio are discussed in some details. (authors)

Valkovic, V. [A.C.T.d.o.o., Prilesje 4, Zagreb (Croatia); Sudac, D.; Obhodas, J. [Dept. of Experimental Physics, Inst. Ruder Boskovic, Zagreb (Croatia); Matika, D. [Inst. for Researches and Development of Defense Systems, Zagreb (Croatia); Kollar, R. [A.C.T.d.o.o., Prilesje 4, Zagreb (Croatia); Nad, K.; Orlic, Z. [Dept. of Experimental Physics, Inst. Ruder Boskovic, Zagreb (Croatia)

2011-07-01T23:59:59.000Z

400

Single ?^- production in np collisions for excess energies up to 90 MeV  

E-Print Network [OSTI]

The quasifree reaction $np\\to pp\\pim$ was studied in a kinematically complete experiment by bombarding a liquid hydrogen target with a deuteron beam of momentum 1.85 GeV/c and analyzing the data along the lines of the spectator model. In addition to the three charged ejectiles the spectator proton was also detected in the large-acceptance time-of-flight spectrometer COSY-TOF. It was identified by its momentum and flight direction thus yielding access to the Fermi motion of the bound neutron and to the effective neutron 4-momentum vector $\\mathbb{P}_n$ which differed from event to event. A range of almost 90 MeV excess energy above threshold was covered. Energy dependent angular distributions, invariant mass spectra as well as fully covered Dalitz plots were deduced. Sizeable $pp$ FSI effects were found as were contributions of $p$ and $d$ partial waves. The behavior of the elementary cross section $\\sigma_{01}$ close to threshold is discussed in view of new cross section data. In comparison with existing literature data the results provide a sensitive test of the spectator model.

COSY-TOF collaboration; :; M. Abdel-Bary; K. -Th. Brinkmann; H. Clement; E. Doroshkevich; S. Dshemuchadse; A. Erhardt; W. Eyrich; H. Freiesleben; A. Gillitzer; R. Jäkel; L. Karsch; K. Kilian; E. Kuhlmann; K. Möller; H. P. Morsch; L. Naumann; N. Paul; C. Pizzolotto; J. Ritman; E. Roderburg; W. Schroeder; M. Schulte-Wissermann; Th. Sefzick; A. Teufel; A. Ucar; P. Wintz; P. Wüstner; P. Zupranski

2007-08-29T23:59:59.000Z

Note: This page contains sample records for the topic "mev cm-1 nuclear" 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

Lateral propagation of MeV electrons generated by femtosecond laser irradiation  

SciTech Connect (OSTI)

The propagation of MeV electrons generated by intense (approx =10{sup 20} W/cm{sup 2}) femtosecond laser irradiation, in the lateral direction perpendicular to the incident laser beam, was studied using targets consisting of irradiated metal wires and neighboring spectator wires embedded in electrically conductive (aluminum) or resistive (Teflon) substrates. The K shell spectra in the energy range 40-60 keV from wires of Gd, Dy, Hf, and W were recorded by a transmission crystal spectrometer. The spectra were produced by 1s electron ionization in the irradiated wire and by energetic electron propagation through the substrate material to the spectator wire of a different metal. The electron range and energy were determined from the relative K shell emissions from the irradiated and spectator wires separated by varying substrate lateral distances of up to 1 mm. It was found that electron propagation through Teflon was inhibited, compared to aluminum, implying a relatively weak return current and incomplete space-charge neutralization. The energetic electron propagation in the direction parallel to the electric field of the laser beam was larger than perpendicular to the electric field. Energetic electron production was lower when directly irradiating aluminum or Teflon compared to irradiating the heavy metal wires. These experiments are important for the determination of the energetic electron production mechanism and for understanding lateral electron propagation that can be detrimental to fast-ignition fusion and hard x-ray backlighter radiography.

Seely, J. F. [Space Science Division, Naval Research Laboratory, Washington DC 20375 (United States); Szabo, C. I. [Laboratoire Kastler Brossel, Ecole Normale Superieure, CNRS, Universite P. et M. Curie-Paris 6 Case 74, 4, Place Jussieu, 75252 Paris Cedex 05 (France); Audebert, P.; Brambrink, E.; Tabakhoff, E. [Laboratoire pour L'Utilisation des Lasers Intenses (LULI), Ecole Polytechnique, 91128 Palaiseau Cedex (France); Hudson, L. T. [National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States)

2010-02-15T23:59:59.000Z

402

Counterterrorism and Counterproliferation | National Nuclear...  

National Nuclear Security Administration (NNSA)

and Counterproliferation | National Nuclear Security Administration People Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response...

403

Relativistic nuclear structure. I. Nuclear matter  

Science Journals Connector (OSTI)

The formalism for the Dirac-Brueckner approach to the nuclear many-body problem is described including its basis in relativistic two-nucleon scattering. A family of relativistic meson-exchange potentials is constructed which (apart from the usual coupling terms for heavy mesons) apply the pseudovector (gradient) coupling for the interaction of pseudoscalar mesons (?,?) with nucleons. These potentials describe low-energy two-nucleon scattering and the deuteron data accurately. Using these potentials, the properties of nuclear matter are calculated in the Dirac-Brueckner-Hartree-Fock approximation, in which the empirical nuclear matter saturation is explained quantitatively. The effective two-body interaction in the nuclear matter medium (G matrix) is calculated directly in the nuclear matter rest frame. Thus, cumbersome transformations between the two-nucleon center-of-mass frame and the nuclear matter rest frame are avoided. Size and nature of relativistic effects included in the present approach are examined in detail. The formalism, the potentials, and the results of this paper may also serve as a basis and a realistic starting point for systematic relativistic nuclear structure studies as well as for the investigation of further relativistic many-body corrections and of contributions of higher order.

R. Brockmann and R. Machleidt

1990-11-01T23:59:59.000Z

404

Time-of-flight mass measurements for nuclear processes in neutron star crusts  

E-Print Network [OSTI]

The location of electron capture heat sources in the crust of accreting neutron stars depends on the masses of extremely neutron-rich nuclei. We present first results from a new implementation of the time-of-flight technique to measure nuclear masses of rare isotopes at the National Superconducting Cyclotron Laboratory. The masses of 16 neutron-rich nuclei in the scandium -- nickel range were determined simultaneously, improving the accuracy compared to previous data in 12 cases. The masses of $^{61}${V}, $^{63}${Cr}, $^{66}${Mn}, and $^{74}${Ni} were measured for the first time with mass excesses of $-30.510(890)$ MeV, $-35.280(650)$ MeV, $-36.900(790)$ MeV, and $-49.210(990)$ MeV, respectively. With the measurement of the $^{66}$Mn mass, the locations of the two dominant electron capture heat sources in the outer crust of accreting neutron stars that exhibit superbursts are now experimentally constrained. We find that the location of the $^{66}$Fe$\\rightarrow^{66}$Mn electron capture transition occurs signi...

Estrade, A; Schatz, H; Amthor, A M; Bazin, D; Beard, M; Becerril, A; Brown, E F; Cyburt, R; Elliot, T; Gade, A; Galaviz, D; George, S; Gupta, S S; Hix, W R; Lau, R; Lorusso, G; Moller, P; Pereira, J; Portillo, M; Rogers, A M; Shapira, D; Smith, E; Stolz, A; Wallace, M; Wiescher, M

2011-01-01T23:59:59.000Z

405

Measurements of ISGMR in Sn, Cd and Pb isotopes and the asymmetry of nuclear matter incompressibility  

SciTech Connect (OSTI)

The compression-mode isoscalar giant monopole resonance (ISGMR) has been studied in the Sn, Cd and Pb isotopes using inelastic scattering of 400 MeV {alpha}-particles at extreme forward angles, including 0 deg. We have obtained completely 'background-free' inelastic-scattering spectra for the Sn, Cd, and Pb isotopes for a wide angular and excitation-energy range. The various giant resonances excited with different transferred angular momenta were extracted by a multipole-decomposition analysis (MDA). It was found that the centroid energies of the ISGMR in Sn isotopes are significantly lower than the theoretical predictions. The K{sub {tau}} in the empirical expression for the nuclear incompressibility has been determined to be K{sub {tau}} = -550{+-}100 MeV for the Sn isotopes. The extracted value for the Cd isotopes is K{sub {tau}} = -480{+-}100 MeV. These numbers are consistent with values of K{sub {tau}} = -370{+-}120 MeV obtained from an analysis of the isotopic transport ratios in medium-energy heavy-ion reactions, K{sub {tau}} -500{sub -100}{sup +120} MeV obtained from constraints placed by neutron-skin data from anti-protonic atoms across the mass table, and K{sub {tau}} = -500{+-}50 MeV obtained from theoretical calculations using different Skyrme interactions and relativistic mean field (RMF) Lagrangians. Stringent constraints on interactions employed in nuclear structure calculations are obtained on the basis of the experimentally determined values for K{sub {infinity}} and K{sub {tau}}. These parameters constrain as well the equation of state (EOS) of nuclear matter. However, a significant discrepancy still remains. The ISGMR positions in Sn and Cd isotopes are systematically lower than the predictions obtained on basis of determined from the ISGMR in {sup 208}Pb. This raises the question ''Why are Sn and Cd nuclei so soft?''. For a clue to solve the problem, we discuss the preliminary results on the exact positions of the ISGMR in {sup 204,206,208}Pb.

Fujiwara, M.; Hashimoto, H.; Nakanishi, K.; Okumura, S.; Yosoi, M. [Research Center for Nuclear Physics, Osaka University, Mihogaoka 10-1, Ibaraki, Osaka 567-0047 (Japan); Li, T.; Patel, D.; Garg, U.; Berg, G. P. A.; Liu, Y.; Marks, R.; Matta, J.; Nayak, B. K.; Madhusudhana-Rao, P. V.; Long, A.; Sault, K.; Talwar, R. [JINA and Physics Department, University of Notre Dame, Notre Dame, Indiana 46556 (United States); Ichikawa, M.; Itoh, M.; Matsuo, R. [Cyclotron and Radioisotope Center, Tohoku University, Sendai 980-8578 (Japan)

2011-10-28T23:59:59.000Z

406

Nuclear Safety Regulatory Framework  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Department of Energy Department of Energy Nuclear Safety Regulatory Framework DOE's Nuclear Safety Enabling Legislation Regulatory Enforcement & Oversight Regulatory Governance Atomic Energy Act 1946 Atomic Energy Act 1954 Energy Reorganization Act 1974 DOE Act 1977 Authority and responsibility to regulate nuclear safety at DOE facilities 10 CFR 830 10 CFR 835 10 CFR 820 Regulatory Implementation Nuclear Safety Radiological Safety Procedural Rules ISMS-QA; Operating Experience; Metrics and Analysis Cross Cutting DOE Directives & Manuals DOE Standards Central Technical Authorities (CTA) Office of Health, Safety, and Security (HSS) Line Management SSO/ FAC Reps 48 CFR 970 48 CFR 952 Federal Acquisition Regulations External Oversight *Defense Nuclear Facility

407

Nuclear spirals in galaxies  

E-Print Network [OSTI]

Recent high-resolution observations indicate that nuclear spirals are often present in the innermost few hundred parsecs of disc galaxies. My models show that nuclear spirals form naturally as a gas response to non-axisymmetry in the gravitational potential. Some nuclear spirals take the form of spiral shocks, resulting in streaming motions in the gas, and in inflow comparable to the accretion rates needed to power local Active Galactic Nuclei. Recently streaming motions of amplitude expected from the models have been observed in nuclear spirals, confirming the role of nuclear spirals in feeding of the central massive black holes.

Witold Maciejewski

2006-11-08T23:59:59.000Z

408

Pre-equilibrium mechanisms in the93Nb(p,alpha) inclusive reaction at incident energies from 65 to 160 MeV  

E-Print Network [OSTI]

The reaction mechanism of pre-equilibrium proton-induced $\\alpha $-particle emission from 93Nb at an incident energy of 100 MeV was investigated with polarized projectiles. A formalism based on the statistical multistep direct emission model of Feshbach, Kerman and Koonin was found to give a reasonably good reproduction of cross section and analyzing power angular distributions at various emission energies. Existing experimental distributions for the same reaction at an incident energy of 65 MeV were also analyzed with the same model. The incident-energy variation from 65 MeV up to 160 MeV was found to be consistent with the predictions of the basic model. However, whereas knockout of an $\\alpha $ cluster is the dominant reaction mechanism in the final stage at the lowest- and highest incident energies, at 100 MeV a pickup process competes with comparable intensity in yield.

S. S. Dimitrova; A. A. Cowley; E. V. Zemlyanaya; K. V. Lukyanov

2014-09-10T23:59:59.000Z

409

Office of Nuclear Threat Science | National Nuclear Security Administration  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Nuclear Threat Science | National Nuclear Security Administration Nuclear Threat Science | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response Recapitalizing Our Infrastructure Continuing Management Reform Countering Nuclear Terrorism About Us Our Programs Our History Who We Are Our Leadership Our Locations Budget Our Operations Media Room Congressional Testimony Fact Sheets Newsletters Press Releases Speeches Events Social Media Video Gallery Photo Gallery NNSA Archive Federal Employment Apply for Our Jobs Our Jobs Working at NNSA Blog The National Nuclear Security Administration Office of Nuclear Threat Science Home > About Us > Our Programs > Counterterrorism and Counterproliferation > Office of Nuclear Threat Science Office of Nuclear Threat Science

410

Nuclear | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Nuclear Nuclear Nuclear Radioisotope Power Systems, a strong partnership between the Energy Department's Office of Nuclear Energy and NASA, has been providing the energy for deep space exploration. Nuclear power is the use of sustained nuclear fission to generate heat and electricity. Nuclear power plants provide about 6 percent of the world's energy and 13-14 percent of the world's electricity. Featured Five Years of Building the Next Generation of Reactors Simulated three-dimensional fission power distribution of a single 17x17 rod PWR fuel assembly. | Photo courtesy of the Consortium for Advanced Simulation of Light Water Reactors (CASL). A two-year update on the Consortium for Advanced Simulation of Light Water Reactors and the progress being made in overcoming barriers to national

411

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

412

Nuclear and Non-Ionizing Energy-loss of Electrons with Low and Relativistic Energies in Materials and Space Environment  

E-Print Network [OSTI]

The treatment of the electron-nucleus interaction based on the Mott differential cross section was extended to account for effects due to screened Coulomb potentials, finite sizes and finite rest masses of nuclei for electrons above 200 keV and up to ultra high energies. This treatment allows one to determine both the total and differential cross sections, thus, subsequently to calculate the resulting nuclear and non-ionizing stopping powers. Above a few hundreds of MeV, neglecting the effect due to finite rest masses of recoil nuclei the stopping power and NIEL result to be largely underestimated; while, above a few tens of MeV the finite size of the nuclear target prevents a further large increase of stopping powers which approach almost constant values.

Boschini, M J; Gervasi, M; Giani, S; Grandi, D; Ivanchenko, V; Nieminem, P; Pensotti, S; Rancoita, P G; Tacconi, M

2011-01-01T23:59:59.000Z

413

Nuclear and Non-Ionizing Energy-loss of Electrons with Low and Relativistic Energies in Materials and Space Environment  

E-Print Network [OSTI]

The treatment of the electron-nucleus interaction based on the Mott differential cross section was extended to account for effects due to screened Coulomb potentials, finite sizes and finite rest masses of nuclei for electrons above 200 keV and up to ultra high energies. This treatment allows one to determine both the total and differential cross sections, thus, subsequently to calculate the resulting nuclear and non-ionizing stopping powers. Above a few hundreds of MeV, neglecting the effect due to finite rest masses of recoil nuclei the stopping power and NIEL result to be largely underestimated; while, above a few tens of MeV the finite size of the nuclear target prevents a further large increase of stopping powers which approach almost constant values.

M. J. Boschini; C. Consolandi; M. Gervasi; S. Giani; D. Grandi; V. Ivanchenko; P. Nieminem; S. Pensotti; P. G. Rancoita; M. Tacconi

2011-12-06T23:59:59.000Z

414

Research in heavy-ion nuclear physics. [Dept. of Physics and Astronomy, The Univ. of Kansas, Lawrence, Kansas  

SciTech Connect (OSTI)

Attention was focused on the fission process in light nuclear systems. A model calculation based on the transition-state model of nuclear fission was applied to [sup 47]V fission as populated through multiple entrance channels and to fusion-fission cross sections for production of [sup 28]Al through three different entrance channels. Angular distributions are shown for different mass channels of the [sup 29]Si+[sup 27]Al reaction at E[sub lab] = 125 MeV. Pronounced structure is seen in the symmetric and near-symmetric fission channels from the [sup 24]Mg+[sup 24]Mg reaction; cross sections for binary fragment emission are shown for E[sub lab] = 90 MeV. A large Bragg-curve detector was used in this experiment. Ways to optimize detector response were studied; in addition, the Bragg detector was instrumented with an internal position-sensitive multiwire proportional counter.

Sanders, S.J.; Prosser, F.W.

1992-01-01T23:59:59.000Z

415

D–D nuclear fusion induced by laser-generated plasma at 1016 W cm?2 intensity  

Science Journals Connector (OSTI)

Deuterated polyethylene targets (CD2-monomer), as thin and thick films, were laser irradiated in a vacuum at 1016 W cm?2 intensity. The produced plasma was monitored in situ using the Thomson parabola spectrometer, ion collectors and SiC semiconductor detectors. For thin targets irradiated under target-normal-sheath-acceleration conditions, laser accelerated deuterons with energies higher than 3.0 MeV were measured along the normal to the target surface. Characteristic emissions at 3.0 and 2.5 MeV for protons and neutrons, respectively, have been detected confirming the production of nuclear fusion events. The evidence of nuclear fusion effects was evaluated and discussed.

Lorenzo Torrisi; Salvatore Cavallaro; Maria Cutroneo; Josef Krasa; Daniel Klir

2014-01-01T23:59:59.000Z

416

The Evolution of Swift/BAT blazars and the origin of the MeV background  

SciTech Connect (OSTI)

We use 3 years of data from the Swift/BAT survey to select a complete sample of X-ray blazars above 15 keV. This sample comprises 26 Flat-Spectrum Radio Quasars (FSRQs) and 12 BL Lac objects detected over a redshift range of 0.03 < z < 4.0. We use this sample to determine, for the first time in the 15-55 keV band, the evolution of blazars. We find that, contrary to the Seyfert-like AGNs detected by BAT, the population of blazars shows strong positive evolution. This evolution is comparable to the evolution of luminous optical QSOs and luminous X-ray selected AGNs. We also find evidence for an epoch-dependence of the evolution as determined previously for radio-quiet AGNs. We interpret both these findings as a strong link between accretion and jet activity. In our sample, the FSRQs evolve strongly, while our best-fit shows that BL Lacs might not evolve at all. The blazar population accounts for 10-20% (depending on the evolution of the BL Lacs) of the Cosmic X-ray background (CXB) in the 15-55 keV band. We find that FSRQs can explain the entire CXB emission for energies above 500 keV solving the mystery of the generation of the MeV background. The evolution of luminous FSRQs shows a peak in redshift (z{sub c} = 4.3 {+-} 0.5) which is larger than the one observed in QSOs and X-ray selected AGNs. We argue that FSRQs can be used as tracers of massive elliptical galaxies in the early Universe.

Ajello, M.; /SLAC /KIPAC, Menlo Park; Costamante, L.; /Stanford U., HEPL /KIPAC, Menlo Park; Sambruna, R.M.; Gehrels, N.; /NASA, Goddard; Chiang, J.; /SLAC /KIPAC, Menlo Park; Rau, A.; /Caltech; Escala, A.; /SLAC /KIPAC, Menlo Park /Cerro Calan Observ.; Greiner, J.; /Garching, Max Planck Inst., MPE; Tueller, J.; /NASA, Goddard; Wall, J.V.; /British Columbia U.; Mushotzky, R.F.; /NASA, Goddard

2009-10-17T23:59:59.000Z

417

TENDL-2011: TALYS-based Evaluated Nuclear Data Library  

SciTech Connect (OSTI)

The 4. release of the TENDL library, TENDL-2011 (TALYS-based Evaluated Nuclear Data Library) is described. This library consists of a complete set of nuclear reaction data for incident neutrons, photons, protons, deuterons, tritons, helions and alpha particles, from 10-5 eV up to 200 MeV, for all isotopes from {sup 6}Li to {sup 281}Ds that are either stable of have a half-life longer than 1 second. All data are completely and consistently evaluated using a software system consisting of the TALYS-1.2 nuclear reaction code, and other programs to handle resonance data, experimental data, data from existing evaluations, and to provide the final ENDF-6 formatting. The result is a nuclear data library with mutually consistent reaction information for all isotopes and a quality that increases with yearly updates. To produce this library, TALYS input parameters are adjusted for many nuclides so that calculated cross sections agree with experimental data, while for important nuclides experimental data are directly included. All information is available on www.talys.eu and www.talys.eu/TENDL-2011. (authors)

Rochman, D.; Koning, A. J. [Nuclear Research and Consultancy Group, Petten (Netherlands)

2012-07-01T23:59:59.000Z

418

A measurement of the 4He(g,n) reaction from 23 < Eg < 70 MeV  

E-Print Network [OSTI]

A comprehensive set of 4He(g,n) absolute cross-section measurements has been performed at MAX-lab in Lund, Sweden. Tagged photons from 23 < Eg < 70 MeV were directed toward a liquid 4He target, and neutrons were identified using pulse-shape discrimination and the Time-of-flight Technique in two liquid-scintillator detector arrays. Seven-point angular distributions have been measured for fourteen photon energies. The results have been subjected to complementary Transition-coefficient and Legendre-coefficient analyses. The results are also compared to experimental data measured at comparable photon energies as well as Recoil-Corrected Continuum Shell Model, Resonating Group Method, and Effective Interaction Hyperspherical-Harmonic Expansion calculations. For photon energies below 29 MeV, the angle-integrated data are significantly larger than the values recommended by Calarco, Berman, and Donnelly in 1983.

B. Nilsson

2006-03-29T23:59:59.000Z

419

Measurement of the H-1(d-],N-])Pp Transverse Polarization Transfer-Coefficient at 42.8 Mev  

E-Print Network [OSTI]

. The scattering angles of the polar- imeter side detectors (NE102 scintillators) were set symmetrically to the left and right at 80 and 120' so as to get independent measurements where the analyzing power A?(O,E) for n-He elastic scattering is opposite in sign...? -04? I I I I I I I I I I I I I I I I 'H(d, ~)Zn Ed=42.8 MeV J I ~ HH - I.O I I I I I I I I I I I I I I I I4 8 l2 l6 20 24 28 32 36 NEUT RON ENERGY E& (MeV) FICx. 1. Measured values of E~~(0 ) vs breakup neutron ener- gy for the 'H(d, n...

Nath, S.; Graves, R. G.; Hiebert, John C.; Northcliffe, L. C.; Woolverton, H. L.; York, R. L.; Brown, R. E.; Doleschall, P.

1983-01-01T23:59:59.000Z

420

50--500 MeV. gamma. -ray emission in the early phase of SN1987A  

SciTech Connect (OSTI)

SN1987A was observed on 19th April 1987 with a combined high energy ..gamma..-ray and hard x-ray payload, flown on a stratospheric balloon from Alice Springs, Australia. The ..gamma..-ray detector, sensitive in the energy range 50--500 MeV, was an optical spark chamber with 400cm/sup 2/ area, a field of view of 60/sup 0/ FWHM and a time resolution of 10 ..mu..s. The counting rate profile at approx.2.2 mb float altitude has lead to a 3sigma upper limit to the steady ..gamma..-ray flux of 7 x 10/sup -4/ ph cm/sup -2/ s/sup -1/ in the 50--500 MeV range. This upper limit is compared to our predictions for the time profile of ..gamma..-ray emission from SN1987A resulting from pulsar acceleration of particles to cosmic ray energies.

Sood, R.K.; Thomas, J.A.; Waldron, L.; Manchanda, R.K.; Ubertini, P.; Bazzano, A.; La Padula, C.D.; Rochester, G.K.; Sumner, T.J.; Frye, G.; and others

1988-09-25T23:59:59.000Z

Note: This page contains sample records for the topic "mev cm-1 nuclear" 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

Prototype grooved and spherically bent Si backscattering crystal analyzer for meV resolution inelastic x-ray scattering  

SciTech Connect (OSTI)

The high-order backscattering reflections from single crystals of silicon have mrad rocking curve widths that can be exploited to produce meV energy-resolution focusing analyzer crystals for use in inelastic x-ray scattering experiments at third-generation synchrotron sources. The first generation of these analyzers has been limited in efficiency principally by slope and/or figure errors. We calculate the effect of slope errors on the theoretical energy resolution and focus spot size of a typical analyzer design using a ray-tracing code to ensure that there are no unforeseen contributions to the energy resolution and efficiency. We also present measurements of the slope errors of the atomic planes for a prototype, spherically bent, strain-relief grooved analyzer as proof that it is in principle possible to obtain the slope and figure error limits required for a high efficiency meV resolution backscattering crystal.

Blasdell, R.C.; Macrander, A.T. (Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439-4814 (United States))

1995-02-01T23:59:59.000Z

422

A 50-MeV mm-wave electron linear accelerator system for production of tunable short wavelength synchrotron radiation  

SciTech Connect (OSTI)

The Advanced Photon Source (APS) at Argonne in collaboration with the University of Illinois at Chicago and the University of Wisconsin at Madison is developing a new millimeter wavelength, 50-MeV electron linear accelerator system for production of coherent tunable wavelength synchrotron radiation. Modern micromachining techniques based on deep etch x-ray lithography, LIGA (Lithografie, Galvanoformung, Abformung), capable of producing high-aspect ratio structures are being considered for the fabrication of the accelerating components.

Nassiri, A.; Kustom, R.L.; Mills, F.E.; Kang, Y.W.; Matthews, P.J.; Grudzien, D.; Song, J.; Horan, D. [Argonne National Lab., IL (United States). Advanced Photon Source Accelerator Systems Div.; Feinerman, A.D.; Willke, T.L. [Argonne National Lab., IL (United States). Advanced Photon Source Accelerator Systems Div.]|[Univ. of Illinois, Chicago, IL (United States). Dept. of Electrical Engineering and Computer Science; Henke, H. [Argonne National Lab., IL (United States). Advanced Photon Source Accelerator Systems Div.]|[Technische Univ., Berlin (Germany). Inst. fuer Theoretische Electrotechnik

1993-12-31T23:59:59.000Z

423

Measurement of parity nonconservation in the proton-proton total cross section at 800 MeV  

SciTech Connect (OSTI)

A report is made of a measurement of parity nonconservation in the transmission of 800-MeV longitudinally polarized protons through an unpolarized, 1-m liquid-hydrogen target. The dependence of transmission on beam properties was studied to measure and to correct for systematic errors. The measured longitudinal asymmetry in the total cross section is A/sub L/ = (+2.4 +- 1.1 (statistical) +- 0.1 (systematic)) x 10/sup -7/. 25 refs., 2 figs.

Bowman, J.D.

1986-01-01T23:59:59.000Z

424

The Office of Nuclear Verification | National Nuclear Security  

National Nuclear Security Administration (NNSA)

Nuclear Verification | National Nuclear Security Nuclear Verification | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response Recapitalizing Our Infrastructure Continuing Management Reform Countering Nuclear Terrorism About Us Our Programs Our History Who We Are Our Leadership Our Locations Budget Our Operations Media Room Congressional Testimony Fact Sheets Newsletters Press Releases Speeches Events Social Media Video Gallery Photo Gallery NNSA Archive Federal Employment Apply for Our Jobs Our Jobs Working at NNSA Blog The Office of Nuclear Verification Home > About Us > Our Programs > Nonproliferation > Nonproliferation & International Security > The Office of Nuclear Verification The Office of Nuclear Verification

425

Eisenhower Halts Nuclear Weapons Testing | National Nuclear Security  

National Nuclear Security Administration (NNSA)

Eisenhower Halts Nuclear Weapons Testing | National Nuclear Security Eisenhower Halts Nuclear Weapons Testing | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response Recapitalizing Our Infrastructure Continuing Management Reform Countering Nuclear Terrorism About Us Our Programs Our History Who We Are Our Leadership Our Locations Budget Our Operations Media Room Congressional Testimony Fact Sheets Newsletters Press Releases Speeches Events Social Media Video Gallery Photo Gallery NNSA Archive Federal Employment Apply for Our Jobs Our Jobs Working at NNSA Blog Home > About Us > Our History > NNSA Timeline > Eisenhower Halts Nuclear Weapons Testing Eisenhower Halts Nuclear Weapons Testing August 22, 1958 Washington, DC Eisenhower Halts Nuclear Weapons Testing

426

Nuclear Physlcs A305 (1978) 502-508 ; North-XogaadPrtblWtlny Co., dmrtesrlant xot to be reprodaoed by photopdnt or mkxo8lm without wrltten permitdon from the yuUtiaha  

E-Print Network [OSTI]

and disappears at higher energies. NUCLEAR REACTIONS ~H(p, aq, E = 377, 462 and 576 MeV ; measured a(~. Recent interest in the (p, ~c) reactions in nuclei stems from thework oftheUppsala group r) on low energy pion or the reaction mechanism t Work performed under the auspices of the US Energy Research and Development

McDonald, Kirk

427

Nuclear Science | ORNL  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Educational Outreach Educational Outreach Publications and Reports News and Awards Home | Science & Discovery | Nuclear Science Nuclear Science | Nuclear Science SHARE In World War II's Manhattan Project, ORNL helped usher in the nuclear age. Today, laboratory scientists are leaders in using nuclear technologies and systems to improve human health; explore safer, more environmentally friendly power; and better understand the structure of matter. Thanks to its nuclear heritage, ORNL is a world leader in the production of isotopes for medical purposes and research. The lab's High Flux Isotope Reactor (HFIR) and Radiochemical Engineering Development Center (REDC) together provide the western world's sole supply of californium-252, an isotope instrumental in a wide variety of uses including cancer therapy,

428

nuclear | OpenEI  

Open Energy Info (EERE)

nuclear nuclear Dataset Summary Description This dataset presents summary information related to world nuclear energy. It is part of a supporting dataset for the book World On the Edge: How to Prevent Environmental and Economic Collapse by Lester R. Source Earth Policy Institute Date Released January 12th, 2011 (3 years ago) Date Updated Unknown Keywords EU nuclear nuclear electricity world Data application/vnd.ms-excel icon Summary nuclear energy consumption data (xls, 68.6 KiB) Quality Metrics Level of Review Some Review Comment Temporal and Spatial Coverage Frequency Time Period License License Open Data Commons Attribution License Comment "Reuse of our data is permitted. We merely ask that wherever it is listed, it be appropriately cited" Rate this dataset

429

Nuclear Science References Database  

E-Print Network [OSTI]

The Nuclear Science References (NSR) database together with its associated Web interface, is the world's only comprehensive source of easily accessible low- and intermediate-energy nuclear physics bibliographic information for more than 210,000 articles since the beginning of nuclear science. The weekly-updated NSR database provides essential support for nuclear data evaluation, compilation and research activities. The principles of the database and Web application development and maintenance are described. Examples of nuclear structure, reaction and decay applications are specifically included. The complete NSR database is freely available at the websites of the National Nuclear Data Center http://www.nndc.bnl.gov/nsr and the International Atomic Energy Agency http://www-nds.iaea.org/nsr.

B. Pritychenko; E. B?ták; B. Singh; J. Totans

2014-07-08T23:59:59.000Z

430

Isoscalar Transition Rates Via Ca-40, Pb-208(alpha,alpha') at 79 Mev  

E-Print Network [OSTI]

. Agreement between the two analyses is best for the 2+ state in 'OSPb and worst for the 3 state in ' Ca. The explicit inclusion of exchange effects tends to reduce the discrepancy between the two reaction models. NUCLEAR REACTIONS Ca, Pb(e, a'), E =79.1 Me... experiments'~" " in Table D. The agreement is in general good, es- pecially among the (u, o.) results. ISOSCALAR TRANSITION RATES VIA ' Ca, 'O'Pb(o. , o. '). . . 10'75 I I I I I I I I I I I I I I I (o) 800? cn 600? O ~ 400- oooo 200? 0 256 106 (b...

Rutledge, L. L.; Hiebert, John C.

1976-01-01T23:59:59.000Z

431

The response of NE 102 to 2.6-28.0 MeV neutrons  

E-Print Network [OSTI]

are not sufficiently precise for 1 detector efficiency de~tion in this region. Although the re~as 2-7 function of NE 102 has been studied by several groups ), the data are This paper follows the style and format of Nuclear Instr!ments and Nethods. tco sparse...V, was found to be about 3. 4%. The data of Gettner and Selove and of Czirr et al. were at tco low an ~ for direct comparison with the present data. They were, however, considered when calculating the zero ~lated curve. 'Ihe curve is a least squares fitted...

Martin, Stephen Dobie

2012-06-07T23:59:59.000Z

432

National Nuclear Security Administration  

Broader source: Energy.gov (indexed) [DOE]

National Nuclear Security Administration National Nuclear Security Administration Ofice of Secure Transportation mKlK= Box RQMM= ^luquerqueI= kj= UTNUR= ;JAN 03 213 MEMORANDUM FOR GREGORY eK= WOODS GENERAL COUNSEL DEPARTMENT OF ENERGY FROM: SUBJECT: JEFFREY P. HARREL ASSIST ANT DEPU FOR SECURE 2013 ANNUAL PLANNING SUMMARY In response to your memorandum of December TI= 2012, the following information is provided for the National Nuclear Security Administration Ofice of Secure

433

Absolute nuclear material assay  

DOE Patents [OSTI]

A method of absolute nuclear material assay of an unknown source comprising counting neutrons from the unknown source and providing an absolute nuclear material assay utilizing a model to optimally compare to the measured count distributions. In one embodiment, the step of providing an absolute nuclear material assay comprises utilizing a random sampling of analytically computed fission chain distributions to generate a continuous time-evolving sequence of event-counts by spreading the fission chain distribution in time.

Prasad, Manoj K. (Pleasanton, CA); Snyderman, Neal J. (Berkeley, CA); Rowland, Mark S. (Alamo, CA)

2012-05-15T23:59:59.000Z

434

Energy from nuclear power  

SciTech Connect (OSTI)

Nuclear power should play a pivotal and expanded role in supplying world energy, the authors says. Risks must be minimized by designing a new generation of safe reactors. Atomic energy's vast potential can be harnessed only if issues of safety, waste and nuclear-weapon proliferation are addressed by a globally administered institution. The current situation in nuclear power is described before addressing its future.

Haefele, W.

1990-09-01T23:59:59.000Z

435

Nuclear rearrangement energy  

Science Journals Connector (OSTI)

The concept of rearrangement energy in nuclear particle removal is carefully defined by specifying several energies associated with the process and its analysis. Connection is made between the present definition and closely related concepts apt to be confused with "rearrangement energy" so defined. Remarks are made concerning the implications of rearrangement to analysis and interpretation of experimental data.NUCLEAR STRUCTURE Nuclear rearrangement energy theoretically defined and differentiated from related energies. Reaction theories examined regarding rearrangement.

William A. Friedman

1975-07-01T23:59:59.000Z

436

Nuclear Fabrication Consortium  

SciTech Connect (OSTI)

This report summarizes the activities undertaken by EWI while under contract from the Department of Energy (DOE) � Office of Nuclear Energy (NE) for the management and operation of the Nuclear Fabrication Consortium (NFC). The NFC was established by EWI to independently develop, evaluate, and deploy fabrication approaches and data that support the re-establishment of the U.S. nuclear industry: ensuring that the supply chain will be competitive on a global stage, enabling more cost-effective and reliable nuclear power in a carbon constrained environment. The NFC provided a forum for member original equipment manufactures (OEM), fabricators, manufacturers, and materials suppliers to effectively engage with each other and rebuild the capacity of this supply chain by : � Identifying and removing impediments to the implementation of new construction and fabrication techniques and approaches for nuclear equipment, including system components and nuclear plants. � Providing and facilitating detailed scientific-based studies on new approaches and technologies that will have positive impacts on the cost of building of nuclear plants. � Analyzing and disseminating information about future nuclear fabrication technologies and how they could impact the North American and the International Nuclear Marketplace. � Facilitating dialog and initiate alignment among fabricators, owners, trade associations, and government agencies. � Supporting industry in helping to create a larger qualified nuclear supplier network. � Acting as an unbiased technology resource to evaluate, develop, and demonstrate new manufacturing technologies. � Creating welder and inspector training programs to help enable the necessary workforce for the upcoming construction work. � Serving as a focal point for technology, policy, and politically interested parties to share ideas and concepts associated with fabrication across the nuclear industry. The report the objectives and summaries of the Nuclear Fabrication Consortium projects. Full technical reports for each of the projects have been submitted as well.

Levesque, Stephen

2013-04-05T23:59:59.000Z

437

Observation of the critical end point in the phase diagram for hot and dense nuclear matter  

E-Print Network [OSTI]

Excitation functions for the Gaussian emission source radii difference ($R^2_{\\text{out}} - R^2_{\\text{side}}$) obtained from two-pion interferometry measurements in Au+Au ($\\sqrt{s_{NN}}= 7.7 - 200$ GeV) and Pb+Pb ($\\sqrt{s_{NN}}= 2.76$ TeV) collisions, are studied for a broad range of collision centralities. The observed non-monotonic excitation functions validate the finite-size scaling patterns expected for the deconfinement phase transition and the critical end point (CEP), in the temperature vs. baryon chemical potential ($T,\\mu_B$) plane of the nuclear matter phase diagram. A Finite-Size Scaling (FSS) analysis of these data indicate a second order phase transition with the estimates $T^{\\text{cep}} \\sim 165$~MeV and $\\mu_B^{\\text{cep}} \\sim 100$~MeV for the location of the critical end point. The critical exponents ($\

Lacey, Roy A

2014-01-01T23:59:59.000Z

438

Density dependence of the nuclear symmetry energy from measurements of neutron radii in nuclei  

SciTech Connect (OSTI)

We study the density dependence of the nuclear symmetry energy, characterized by its slope parameter L, by means of the information provided by the neutron radius and the neutron skin thickness in finite nuclei. These quantities are extracted from the analysis of data obtained in antiprotonic atoms, from the parity-violating asymmetry at low-momentum transfer in polarized electron scattering in {sup 208}Pb, and from the electric dipole polarizability obtained via polarized proton inelastic scattering at forward angles in {sup 208}Pb. All these experiments provide different constraints on the slope L of the symmetry energy but the corresponding values have a considerable overlap in a range around 50 MeV ? L ? 70 MeV, in a reasonable agreement with other estimates that use different observables and methods to extract L.

Viñas, X.; Centelles, M. [Departament d'Estructura i Constituents de la Matèria and Institut de Ciències del Cosmos, Facultat de Física, Universitat de Barcelona, Martí i Franquès 1, 08028 Barcelona (Spain); Roca-Maza, X. [Dipartimento di Fisica, Università degli Studi di Milano and INFN, Sezione di Milano, I-20133 Milano (Italy); Warda, M. [Katedra Fizyki Teoretycznej, Uniwersytet Marii Curie–Sk?odowskiej ul. Radziszewskiego 10, 20-031 Lublin (Poland)

2014-07-23T23:59:59.000Z

439

NUCLEAR REGULATORY COMMISSION  

Broader source: Energy.gov (indexed) [DOE]

December 21, 1999 (Volume 64, Number 244)] December 21, 1999 (Volume 64, Number 244)] [Proposed Rules] [Page 71331-71333] From the Federal Register Online via GPO Access [wais.access.gpo.gov] [DOCID:fr21de99-21] ======================================================================= ----------------------------------------------------------------------- NUCLEAR REGULATORY COMMISSION 10 CFR Parts 71 and 73 RIN 3150-AG41 Advance Notification to Native American Tribes of Transportation of Certain Types of Nuclear Waste AGENCY: Nuclear Regulatory Commission. ACTION: Advance notice of proposed rulemaking. ----------------------------------------------------------------------- SUMMARY: The Nuclear Regulatory Commission (NRC) is considering an amendment to its regulations that would require NRC licensees to notify

440

Controlled Nuclear Fusion Reactions  

Science Journals Connector (OSTI)

... THE presentation of full and authoritative accounts of research on controlled nuclear fusion reactions was a major feature of the second Geneva Conference on the Peaceful Uses of ...

R. S. PEASE

1958-10-18T23:59:59.000Z

Note: This page contains sample records for the topic "mev cm-1 nuclear" 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

Unclassified Controlled Nuclear Information  

Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]

To prevent unauthorized dissemination of Unclassified Controlled Nuclear Information (UCNI). Cancels DOE 5635.4 and DOE 5650.3A

1995-09-25T23:59:59.000Z

442

Nuclear Energy Systems  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Role of Synchrotron Radiation in Solving Scientific Challenges in Advanced Nuclear Energy Systems 27 to 28 January 2010 at Argonne's Advanced Photon Source Scope Third-generation...

443

Comprehensive Nuclear Materials  

SciTech Connect (OSTI)

This book encompasses a rich seam of current information on the vast and multidisciplinary field of nuclear materials employed in fission and prototype fusion systems. Discussion includes both historical and contemporary international research in nuclear materials, from Actinides to Zirconium alloys, from the worlds leading scientists and engineers. Synthesizes pertinent current science to support the selection, assessment, validation and engineering of materials in extreme nuclear environments. The work discusses the major classes of materials suitable for usage in nuclear fission, fusion reactors and high power accelerators, and for diverse functions in fuels, cladding, moderator and control materials, structural, functional, and waste materials.

Konings, Dr. Rudy J. M. [European Commission Joint Research Centre; Allen, Todd R. [University of Wisconsin, Madison; Stoller, Roger E [ORNL; Yamanaka, Prof. Shinsuke [Osaka University

2012-01-01T23:59:59.000Z

444

Nuclear criticality safety guide  

SciTech Connect (OSTI)

This technical reference document cites information related to nuclear criticality safety principles, experience, and practice. The document also provides general guidance for criticality safety personnel and regulators.

Pruvost, N.L.; Paxton, H.C. [eds.] [eds.

1996-09-01T23:59:59.000Z

445

Nuclear Physics: Experiment Research  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

search Nuclear Physics Program Please upgrade your browser. This site's design is only visible in a graphical browser that supports web standards, but its content is accessible to...

446

Nuclear Power in Idaho  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Look at Issues Dr. Ralph Bennett Idaho National Laboratory 2 What's been Changing? 1. Nuclear Regulatory Commission (NRC) * Combined constructionoperating license (COL) * Early...

447

Nuclear Data Links  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Links to Useful Online Nuclear Physics Journals Important Online Resources Science Direct American Institute of Physics Journals APS Journals Online: Physical Review A, B, C, D, E,...

448

Nuclear Science Series: Radiochemistry  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

eBooks Radiochemistry Nuclear Science Series: Radiochemistry These volumes are publicly accessible via the Library Catalog or the links below. Question? 667-5809 Email Scope...

449

EIA - State Nuclear Profiles  

U.S. Energy Information Administration (EIA) Indexed Site

Massachusetts Nuclear Profile 2010 Massachusetts profile Massachusetts total electric power industry, summer capacity and net generation, by energy source, 2010 Primary energy...

450

EIA - State Nuclear Profiles  

U.S. Energy Information Administration (EIA) Indexed Site

Iowa Nuclear Profile 2010 Iowa profile Iowa total electric power industry, summer capacity and net generation, by energy source, 2010 Primary energy source Summer capacity (mw)...

451

EIA - State Nuclear Profiles  

U.S. Energy Information Administration (EIA) Indexed Site

Illinois Nuclear Profile 2010 Illinois profile Illinois total electric power industry, summer capacity and net generation, by energy source, 2010 Primary energy source Summer...

452

Nuclear magnetic resonance imaging  

Science Journals Connector (OSTI)

Nuclear magnetic resonance imaging (NMRI) is a powerful imaging modality having a range of important applications to medicine and industry. The basic principles of NMRI are reviewed in...

Rothwell, William P

1985-01-01T23:59:59.000Z

453

EIA - State Nuclear Profiles  

U.S. Energy Information Administration (EIA) Indexed Site

Louisiana Nuclear Profile 2010 Louisiana profile Louisiana total electric power industry, summer capacity and net generation, by energy source, 2010 Primary energy source Summer...

454

Nuclear Physics from QCD  

E-Print Network [OSTI]

Effective field theories provide a bridge between QCD and nuclear physics. I discuss light nuclei from this perspective, emphasizing the role of fine-tuning.

U. van Kolck

2008-12-20T23:59:59.000Z

455

The Chernobyl Nuclear Accident  

Science Journals Connector (OSTI)

...often repeated belief of the opponents of nuclear power that the risks, whatever they are, outweigh the need for and the known value of nuclear energy in developing electric power in the world. We are some 44 years away from the first development of nuclear energy, and yet the authors of this editorial... To the Editor: Cassel and Leaning began their editorial (July 27 issue)1 with a review of the report on the Chernobyl nuclear accident by Baranov et al.2 in the same issue, but they very quickly shifted to a barrage of warning shots across the bow of the ...

1990-02-08T23:59:59.000Z

456

Nuclear Physics Program  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Office Data Acquisition Group Detector & Imaging Group Electronics Group User Liaison Nuclear Physics Program HALL A Hall A wide shot of detectors Scientists from across the...

457

National Nuclear Security Administration  

National Nuclear Security Administration (NNSA)

University of California Extend Management Contracts For Defense Labs The Department of Energy (DOE), the National Nuclear Security Administration (NNSA) and the University of...

458

Nuclear Magnetic Moments  

Science Journals Connector (OSTI)

This paper contains approximate formulas (Eqs. (5) and (6) for the calculation of nuclear magnetic moments from observed hyperfine structure separations.

S. Goudsmit

1933-04-15T23:59:59.000Z

459

Management of Nuclear Materials  

Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]

To establish requirements for the lifecycle management of DOE owned and/or managed accountable nuclear materials. Cancels DOE O 5660.1B.

2009-08-17T23:59:59.000Z

460

Nuclear Power Facilities (2008) | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Nuclear Power Facilities (2008) Nuclear Power Facilities (2008) Nuclear Power Facilities (2008) More Documents & Publications Financial Institution Partnership Program - Commercial...

Note: This page contains sample records for the topic "mev cm-1 nuclear" 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

Unclassified Controlled Nuclear Information (UCNI) | Department...  

Energy Savers [EERE]

Unclassified Controlled Nuclear Information (UCNI) Unclassified Controlled Nuclear Information (UCNI) Welcome to the Unclassified Controlled Nuclear Information (UCNI) webpage....

462

National Nuclear Security Administration | Department of Energy  

Office of Environmental Management (EM)

National Nuclear Security Administration National Nuclear Security Administration National Nuclear Security Administration More Documents & Publications Global Threat Reduction...

463

Nuclear Transportation Management Services | Department of Energy  

Office of Environmental Management (EM)

Nuclear Transportation Management Services Nuclear Transportation Management Services Nuclear Transportation Management Services More Documents & Publications Transportation and...

464

Unclassified Controlled Nuclear Information Training | Department...  

Office of Environmental Management (EM)

Unclassified Controlled Nuclear Information Training Unclassified Controlled Nuclear Information Training Training Unclassified Controlled Nuclear Information for persons with...

465

Advanced Nuclear Energy Projects Solicitation | Department of...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Advanced Nuclear Energy Projects Solicitation Advanced Nuclear Energy Projects Solicitation INFORMATIONAL MATERIALS ADVANCED NUCLEAR ENERGY PROJECTS SOLICITATION Solicitation...

466

Draft Advanced Nuclear Energy Projects Solicitation | Department...  

Broader source: Energy.gov (indexed) [DOE]

Draft Advanced Nuclear Energy Projects Solicitation Draft Advanced Nuclear Energy Projects Solicitation INFORMATIONAL MATERIALS DRAFT ADVANCED NUCLEAR ENERGY PROJECTS SOLICITATION...

467

The thick-target {sup 9}Be(d,n) neutron spectra for deuteron energies between 2.6 and 7.0-MeV  

SciTech Connect (OSTI)

The measurement of the zero deg. neutron spectra and yields from deuterons incident on thick beryllium metal targets is described. {sup 235}U and {sup 238}U fission ion chambers were used as neutron detectors to span the neutron energy range above 0.05-MeV with a time resolution of {le} 3 nanosec. Measurements were made for incident deuteron energies from 2.6 to 7.0-MeV, at 0.4-MeV intervals, using time-of-flight techniques with flight paths of 2.7 and 6.8 meters. The results are presented in graphical form and in tables.

Meadows, J.W.

1991-11-01T23:59:59.000Z

468

The thick-target sup 9 Be(d,n) neutron spectra for deuteron energies between 2. 6 and 7. 0-MeV  

SciTech Connect (OSTI)

The measurement of the zero deg. neutron spectra and yields from deuterons incident on thick beryllium metal targets is described. {sup 235}U and {sup 238}U fission ion chambers were used as neutron detectors to span the neutron energy range above 0.05-MeV with a time resolution of {le} 3 nanosec. Measurements were made for incident deuteron energies from 2.6 to 7.0-MeV, at 0.4-MeV intervals, using time-of-flight techniques with flight paths of 2.7 and 6.8 meters. The results are presented in graphical form and in tables.

Meadows, J.W.

1991-11-01T23:59:59.000Z

469

Nuclear fuel cycle information workshop  

SciTech Connect (OSTI)

This overview of the nuclear fuel cycle is divided into three parts. First, is a brief discussion of the basic principles of how nuclear reactors work; second, is a look at the major types of nuclear reactors being used and world-wide nuclear capacity; and third, is an overview of the nuclear fuel cycle and the present industrial capability in the US.

Not Available

1983-01-01T23:59:59.000Z

470

Generation IV Nuclear Energy Systems ...  

E-Print Network [OSTI]

Generation IV Nuclear Energy Systems ... The U.S. Department of Energy's Office of Nuclear Energy enhance safety and security, and develop nuclear power as an energy source for industrial applications Information ... U.S. Department of Energy www.energy.gov DOE Office of Nuclear Energy www.nuclear

Kemner, Ken

471

National Nuclear Science Week 2012 - SRSCRO  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

to Know Nuclear National Nuclear Science Week January 23 - 27, 2012 Fostering a deeper public understanding Logos for: National Nuclear Science Week, Nuclear Workforce Initiative,...

472

Civilian Nuclear Programs, SPO-CNP: LANL  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Nuclear Office of Science Civilian Nuclear Programs Home Advanced Nuclear Energy Programs Yucca Mountain and Nevada Test Site Programs WIPP and Actinide Science Programs Nuclear...

473

Nuclear Resonance Fluorescence for Materials Assay  

E-Print Network [OSTI]

nuclear forensics, and safeguards for nuclear fuel cyclesIndex Terms—Nuclear Safeguards, non-destructive analysis,radiological source, nuclear safeguards including measuring

Quiter, Brian

2010-01-01T23:59:59.000Z

474

The Office of Nuclear Energy Announces Central Europe Nuclear Safety  

Broader source: Energy.gov (indexed) [DOE]

The Office of Nuclear Energy Announces Central Europe Nuclear The Office of Nuclear Energy Announces Central Europe Nuclear Safety Workshop in Prague The Office of Nuclear Energy Announces Central Europe Nuclear Safety Workshop in Prague October 3, 2011 - 2:04pm Addthis The Office of Nuclear Energy, in partnership with Czech Republic Ministry of Industry and Trade, Ministry of Foreign Affairs, the State Agency for Nuclear Safety of the Czech Republic, and Argonne National Laboratory, is conducting a regional Nuclear Safety Workshop on Trends in Nuclear Power Plant Safety for Robust Civil Nuclear Programs on Oct. 10-13, 2011 in Prague. U.S. Ambassador Norman Eisen and Department of Energy Assistant Secretary for Nuclear Energy Dr. Pete Lyons will deliver speeches welcoming participants. Representatives from the Czech Republic, Bulgaria, Lithuania,

475

The Nuclear Revolution, Relative Gains, and International Nuclear Assistance  

E-Print Network [OSTI]

204. Bhatia, Shyam. 1988. Nuclear rivals in the Middle East.of the merits of selective nuclear proliferation. Journal ofThe Case for a Ukranian nuclear deterrent. Foreign Affairs.

Kroenig, Matthew

2006-01-01T23:59:59.000Z

476

Density content of nuclear symmetry energy from nuclear observables  

Science Journals Connector (OSTI)

The nuclear symmetry energy at a given density measures the energy transferred in converting symmetric nuclear matter into the pure neutron matter. The density content of nuclear symmetry energy remains poorly co...

B K AGRAWAL

2014-11-01T23:59:59.000Z

477

NUCLEAR ENERGY PERGAMON Annals of Nuclear Energy 27 (2000) 138551398  

E-Print Network [OSTI]

annafs of NUCLEAR ENERGY PERGAMON Annals of Nuclear Energy 27 (2000) 138551398 www-4549(00)00033-5 #12;1386 I. Phi!, V. Arzhanov. /Annals qf Nuclear Energy 27 (2000) 1385-1398 subcritical systems (ADS

Pázsit, Imre

478

Prompt muon-induced fission: a sensitive probe for nuclear energy dissipation and fission dynamics  

E-Print Network [OSTI]

Following the formation of an excited muonic atom, inner shell transitions may proceed without photon emission by inverse internal conversion, i.e. the muonic excitation energy is transferred to the nucleus. In actinides, the 2p -> 1s and the 3d -> 1s muonic transitions result in excitation of the nuclear giant dipole and giant quadrupole resonances, respectively, which act as doorway states for fission. The nuclear excitation energy is typically 6.5 - 10 MeV. Because the muon lifetime is long compared to the timescale of prompt nuclear fission, the motion of the muon in the Coulomb field of the fissioning nucleus may be utilized to learn about the dynamics of fission.

Volker E. Oberacker; A. Sait Umar; Feodor F. Karpeshin

2004-03-30T23:59:59.000Z

479

Shear viscosity of hot nuclear matter by the mean free path method  

E-Print Network [OSTI]

The shear viscosity of hot nuclear matter is investigated by using the mean free path method within the framework of IQMD model. Finite size nuclear sources at different density and temperature are initialized based on the Fermi-Dirac distribution. The results show that shear viscosity to entropy density ratio decreases with the increase of temperature and tends toward a constant value for $\\rho\\sim\\rho_0$, which is consistent with the previous studies on nuclear matter formed during heavy-ion collisions. At $\\rho\\sim\\frac{1}{2}\\rho_0$, a minimum of $\\eta/s$ is seen at around $T=10$ MeV and a maximum of the multiplicity of intermediate mass fragment ($M_{\\text{IMF}}$) is also observed at the same temperature which is an indication of the liquid-gas phase transition.

D. Q. Fang; Y. G. Ma; C. L. Zhou

2014-04-17T23:59:59.000Z

480

Shear viscosity of hot nuclear matter by the mean free path method  

E-Print Network [OSTI]

The shear viscosity of hot nuclear matter is investigated by using the mean free path method within the framework of IQMD model. Finite size nuclear sources at different density and temperature are initialized based on the Fermi-Dirac distribution. The results show that shear viscosity to entropy density ratio decreases with the increase of temperature and tends toward a constant value for $\\rho\\sim\\rho_0$, which is consistent with the previous studies on nuclear matter formed during heavy-ion collisions. At $\\rho\\sim\\frac{1}{2}\\rho_0$, a minimum of $\\eta/s$ is seen at around $T=10$ MeV and a maximum of the multiplicity of intermediate mass fragment ($M_{\\text{IMF}}$) is also observed at the same temperature which is an indication of the liquid-gas phase transition.

Fang, D Q; Zhou, C L

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "mev cm-1 nuclear" 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

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

482

Nuclear Waste Management using Electrometallurgical Technology - Nuclear  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Technology Technology Nuclear Fuel Cycle and Waste Management Technologies Overview Modeling and analysis Unit Process Modeling Mass Tracking System Software Waste Form Performance Modeling Safety Analysis, Hazard and Risk Evaluations Development, Design, Operation Overview Systems and Components Development Expertise System Engineering Design Other Major Programs Work with Argonne Contact us For Employees Site Map Help Join us on Facebook Follow us on Twitter NE Division on Flickr Nuclear Waste Management using Electrometallurgical Technology Bookmark and Share The NE system engineering activities involve the conceptual design, through the manufacturing and qualification testing of the Mk-IV and Mk-V electrorefiner and the cathode processor. These first-of-a-kind large scale

483

Controlled Nuclear Fusion  

Science Journals Connector (OSTI)

... papers have an English abstract. Translations of the Russian papers have already been published in Nuclear Fusion. It is a great pity, for Western readers at least, that the Russian ... two volumes are obviously going to be standard reference books for those interested in controlled nuclear fusion. They also contain a large amount of information, particularly on the theoretical side, ...

GEORGE ROWLANDS

1970-01-31T23:59:59.000Z

484

Lithium and nuclear fusion  

Science Journals Connector (OSTI)

... the EEC of a decision on the siting of the Joint European Torus (JET) nuclear fusion project, worrying setbacks though these are for European fusion research, should not be allowed ... gain is the highest (about 1,800 per fusion reaction). The first generation of nuclear fusion reactors will therefore need a continuous supply of both deuterium and tritium fuel.

Nick Walton, Ed Spooner

1976-06-17T23:59:59.000Z

485

Polyploidy and Nuclear Fusion  

Science Journals Connector (OSTI)

... mitotic figures, reported during delayed wound healing in Rhodnius11, are likewise the result of nuclear fusion. Polyploid nuclei are far more plentiful in the fat body of Rhodnius after extreme ... starved for long periods. It is probable that this occasional polyploidy also is due to nuclear fusion. Endomitosis, however, occurs regularly in the fat body of Rhodnius as in other ...

V. B. WIGGLESWORTH

1966-12-31T23:59:59.000Z

486

Nuclear Regulatory Commission issuances  

SciTech Connect (OSTI)

This thirty-second volume of issuances (1--496) of the Nuclear Regulatory Commission and its Atomic Safety and Licensing Appeal Boards, Atomic Safety and Licensing Boards, and Administrative Law Judges it covers the period from July 1, 1990 to December 31, 1990. The hardbound edition of the Nuclear Regulatory commission Issuances is a final compilation of the monthly issuances. It includes all of the legal precedents for the agency within a six-month period. Any opinions, decisions, denials, memoranda and orders of the Commission inadvertently omitted from the monthly softbounds and any corrections submitted by the NRC legal staff to the printed softbound issuances are contained in the hardbound edition. Cross references in the text and indexes are to the NRCI page numbers which are the same as the page numbers in this publication. Issuances are referred to as follows: Commission--CLI, Atomic Safety and Licensing Appeal Boards--ALAB, Atomic Safety and Licensing Boards--LBP, Administrative Law Judges--ALJ, Directors'Decisions--DD, and Denial of Petitions for Rulemaking--DPRM. Specific facilities discussed are: Carroll County Nuclear Station; Palo Verde Nuclear Generating Station; Perry Nuclear Power Plant; Quad Cities Nuclear Power Stations; Seabrook Station; Shoreham Nuclear Generating Plant; Vermont Yankee Nuclear Power Station; and Vogtle Electric Generating Plant.

Not Available

1990-01-01T23:59:59.000Z

487

New Nuclear Reaction  

Science Journals Connector (OSTI)

Thermonuclear-like reaction points to possibilities for better kind of nuclear energy ... FISSION can make a chain reaction take place, as can fusion. ... To these two, scientists at University of California Radiation Laboratory have added a third: a "catalyzed nuclear reaction," a reaction that yields energy and is akin to fusion (thermonuclear) reactions. ...

1957-01-14T23:59:59.000Z

488

Nuclear power engineering  

Science Journals Connector (OSTI)

... been easy to write 950 pages of unrelenting tedium. But both volumes of Pedersen's Nuclear Power read like computer printouts, an avalanche of factual information recited in a dogged monotone, ... even the most ingenious intricacy is embalmed lifeless on the page. Indeed both volumes of Nuclear Power read disconcertingly like each other. The first is called ...

Walt Patterson

1979-01-25T23:59:59.000Z

489

Whither Nuclear Physics ?  

E-Print Network [OSTI]

Nuclear Physics has had its ups and downs. However in recent years, bucked up by some new and often puzzling data, it has become a potentially very rich field. We review some of these exciting developments in a few important sectors of nuclear physics. Emphasis shall be on the study of exotic nuclei and the new physics that these nuclei are teaching us.

Syed Afsar Abbas

2008-01-07T23:59:59.000Z

490

Physics in nuclear safeguards  

Science Journals Connector (OSTI)

International agreements demand that rigorous control procedures are applied to nuclear material. Containment and surveillance techniques are used to monitor the security aspects of dealing with the material whilst accountancy provides quantitative information. The author shows that the methods used to control nuclear material can be conveniently broken down into these two parts

B.W. Hooton

1984-01-01T23:59:59.000Z

491

Nuclear wastes: Small disposals  

Science Journals Connector (OSTI)

... Much to the relief of many east coast hospitals, universities and medical schools, the Nuclear Regulatory Commission (NRC) is proposing that liquid scintillation media used for detecting low levels ... for detecting low levels of radioactivity in biological samples need no longer be buried in nuclear ...

David Dickson

1980-10-16T23:59:59.000Z

492

Nuclear Explosive Safety  

Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]

The directive establishes specific nuclear explosive safety (NES) program requirements to implement the DOE NES standards and other NES criteria for routine and planned nuclear explosive operations. Cancels DOE O 452.2B. Canceled by DOE O 452.2D.

2006-06-12T23:59:59.000Z

493

Instrumentation of Nuclear Reactors  

Science Journals Connector (OSTI)

... s Lecture Theatre on January 8, a symposium of papers on the instrumentation of nuclear reactors was organized, at which about five hundred members and visitors attended, including guests from ... the Institution, took the chair and introduced Sir John Cockcroft, whose lecture on "Nuclear Reactors and their Applications" provided a general background for the three specialized papers which followed. ...

1953-03-07T23:59:59.000Z

494

[Nuclear theory: Annual report  

SciTech Connect (OSTI)

This report discusses topics on : nuclear structure models; algebraic models of hadronic structure; nuclear reactions; hot rotating nuclei; chaos in nuclei; signatures of the quark-gluon plasma; hadronic spectroscopy; octupole collectivity in nuclei; finite-temperature methods for the many-body problem; and classical limit of algebraic hamiltonians. (LSP)

Iachello, F.; Alhassid, Y.; Kusnezov, D.

1991-12-31T23:59:59.000Z

495

(Nuclear theory: Annual report)  

SciTech Connect (OSTI)

This report discusses topics on : nuclear structure models; algebraic models of hadronic structure; nuclear reactions; hot rotating nuclei; chaos in nuclei; signatures of the quark-gluon plasma; hadronic spectroscopy; octupole collectivity in nuclei; finite-temperature methods for the many-body problem; and classical limit of algebraic hamiltonians. (LSP)

Iachello, F.; Alhassid, Y.; Kusnezov, D.

1991-01-01T23:59:59.000Z

496

Nuclear physics and cosmology  

SciTech Connect (OSTI)

There are important aspects of Cosmology, the scientific study of the large scale properties of the universe as a whole, for which nuclear physics can provide insights. Here, we will focus on Standard Big-Bang Nucleosynthesis and we refer to the previous edition of the School [1] for the aspects concerning the variations of constants in nuclear cosmo-physics.

Coc, Alain [Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), CNRS/IN2P3, Université Paris Sud 11, UMR 8609, Bâtiment 104, F-91405 Orsay Campus (France)

2014-05-09T23:59:59.000Z

497

Office of Nuclear Threat Science | National Nuclear Security Administration  

National Nuclear Security Administration (NNSA)

Threat Science | National Nuclear Security Administration Threat Science | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response Recapitalizing Our Infrastructure Continuing Management Reform Countering Nuclear Terrorism About Us Our Programs Our History Who We Are Our Leadership Our Locations Budget Our Operations Media Room Congressional Testimony Fact Sheets Newsletters Press Releases Speeches Events Social Media Video Gallery Photo Gallery NNSA Archive Federal Employment Apply for Our Jobs Our Jobs Working at NNSA Blog The National Nuclear Security Administration Office of Nuclear Threat Science Home > About Us > Our Programs > Counterterrorism and Counterproliferation > Office of Nuclear Threat Science Office of Nuclear Threat Science

498

Savannah River Nuclear Solutions Celebrates Nuclear Science Week...  

National Nuclear Security Administration (NNSA)

Celebrates Nuclear Science Week With Students | National Nuclear Security Administration Facebook Twitter Youtube Flickr RSS People Mission Managing the Stockpile Preventing...

499

Electric Power Produced from Nuclear Reactor | National Nuclear...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Electric Power Produced from Nuclear Reactor | National Nuclear Security Administration Facebook Twitter Youtube Flickr RSS People Mission Managing the Stockpile Preventing...

500

Nuclear Waste Policy Act Signed | National Nuclear Security Administra...  

National Nuclear Security Administration (NNSA)

Waste Policy Act Signed | National Nuclear Security Administration People Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response...