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Brown, B.A.
State Univ. of New York, Stony Brook (USA)1974
State Univ. of New York, Stony Brook (USA)1974
AbstractAbstract
No abstract available
Primary Subject
Source
1974; 245 p; University Microfilms Order No. 74-14,796.; Thesis (Ph. D.).
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Report
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Thesis/Dissertation
Country of publication
BETA DECAY RADIOISOTOPES, BETA-PLUS DECAY RADIOISOTOPES, DAYS LIVING RADIOISOTOPES, ELECTRON CAPTURE RADIOISOTOPES, ENERGY LEVELS, EVEN-ODD NUCLEI, HOURS LIVING RADIOISOTOPES, INTERMEDIATE MASS NUCLEI, ISOMERIC TRANSITION ISOTOPES, ISOTOPES, MINUTES LIVING RADIOISOTOPES, NIOBIUM ISOTOPES, NUCLEI, ODD-EVEN NUCLEI, RADIOISOTOPES, STABLE ISOTOPES, TECHNETIUM ISOTOPES, YEARS LIVING RADIOISOTOPES, ZIRCONIUM ISOTOPES
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AbstractAbstract
No abstract available
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Source
S0375947402007613; Available from http://dx.doi.org/10.1016/S0375-9474(02)00761-3; Copyright (c) 2017 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
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AbstractAbstract
[en] The shape of allowed Β spectra have a small contribution from the interference of the vector, weak-magnetism and axial GT matrix elements. According to CVC plus charge-symmetry of nuclear interactions, in a 0+→ 1+ transition like the Β and γ decays of the A=14 system, the weak-magnetism and electro-magnetic-Ml matrix elements should be equal. A measurement of the shape of the 14O spectrum, however, disagrees, by a factor of two with naive calculation described above. It has been speculated that because of the high supression of GT matrix element in the A=14 system, one could understand this discrepancy based on small charge-symmetry-effects. We have used shell-model wave functions adjusted to fit 14N(e,e') inelastic scattering, the width of the M1-γ transition, and the Β log f t's, and show that reasonable assumptions lead to estimates that are very close to the naive CVC estimation. We propose that the 14O discrepancy is important and that new experiments should be done to measure the shape of the spectrum
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Secondary Subject
Source
Fall meeting of the Division of Nuclear Physics of the American Physical Society; Bloomington, IN (United States); 25-28 Oct 1995; CONF-9510116--
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Journal Article
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Conference
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AbstractAbstract
[en] Isospin-mixing corrections for superallowed Fermi transitions in fp-shell nuclei are computed within the framework of the shelf model. The study includes a re-evaluation of three nuclei that are part of the set of nine accurately measured transitions and five new cases that are expected to be measured in the future at radioactive-beam facilities. For the heavier fp-shell nuclei, both the configuration mixing term, δIM, and the radial-overlap mis-match correction, δRO, are much larger than in the case of the previous nine transitions. For the nine accurately measured transitions, excellent agreement with the CVC hypothesis is found. but the CKM matrix is found to violate the unitarity condition at the level of 3 σ
Primary Subject
Source
Fall meeting of the Division of Nuclear Physics of the American Physical Society; Bloomington, IN (United States); 25-28 Oct 1995; CONF-9510116--
Record Type
Journal Article
Literature Type
Conference
Journal
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McGrory, J.B.; Brown, B.A.
Oak Ridge National Lab., TN (USA); Michigan State Univ., East Lansing (USA)1982
Oak Ridge National Lab., TN (USA); Michigan State Univ., East Lansing (USA)1982
AbstractAbstract
[en] Shell-model calculations of charge radius differences in the Pb isotopes are discussed. Core quadrupole oscillations are found to be significant factors in the calculations. Existing data on the 210Pb isotope shift and the B(E2) strengths in 210Pb are shown to be inconsistent. Ground-state correlation effects in light nuclei (i.e., 0 and Ca isotopes) introduce odd-even staggering effects and other qualitative features in agreement with existing data
Primary Subject
Source
1982; 26 p; Conference on lasers in nuclear physics; Oak Ridge, TN (USA); 21 - 23 Apr 1982; Available from NTIS., PC A03/MF A01 as DE82017516
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Report
Literature Type
Conference
Report Number
Country of publication
ALPHA DECAY RADIOISOTOPES, BETA DECAY RADIOISOTOPES, BETA-MINUS DECAY RADIOISOTOPES, ENERGY, ENERGY LEVELS, ENERGY-LEVEL TRANSITIONS, EVEN-EVEN NUCLEI, HEAVY NUCLEI, ISOTOPES, MATHEMATICAL MODELS, MULTIPOLE TRANSITIONS, NUCLEAR MODELS, NUCLEAR PROPERTIES, NUCLEI, RADIOISOTOPES, YEARS LIVING RADIOISOTOPES
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AbstractAbstract
[en] The effect of isospin symmetry breaking on level statistics has been examined with the nuclear shell model. The eigenvalues and electromagnetic transitions were calculated with the program OXBASH for the nuclide 26Al for conserved isospin and for broken isospin. The long-range correlations of the eigenvalues, as measured by Δ3, show good agreement between the experimental results and the calculations. However, there are discrepancies between data and calculations for the short-range correlations of the eigenvalues
Primary Subject
Source
S0370269304003776; Copyright (c) 2004 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
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Baltz, A.J.; Weneser, J.; Brown, B.A.; Rapaport, J.
Brookhaven National Lab., Upton, NY (USA); Department of Energy, Washington, DC (USA); Michigan State Univ., East Lansing (USA); Ohio Univ., Athens (USA)1985
Brookhaven National Lab., Upton, NY (USA); Department of Energy, Washington, DC (USA); Michigan State Univ., East Lansing (USA); Ohio Univ., Athens (USA)1985
AbstractAbstract
[en] The motivation for considering the 71Ga(p,n)71Ge reaction is to help determine the properties of 71Ga as a detector of solar neutrinos. The proposed solar neutrino experiment, 71Ga(nu,e-)71Ge, has a threshold of only .236 MeV, and is thus sensitive to neutrinos produced in the basic burning process in the sun p + p → 2H + e+ + nu, which has a .420 MeV endpoint. The excitation of the (5/2)- state at .175 MeV in 71Ge could be important, however. Were the Gamow-Teller (G-T) transition to the 175 keV state equal in strength to the ground state transition there would be approx. 25% added to the detector signal, the greater part of this coming from the 7Be neutrinos; the desired sensitivity to the p-p neutrinos would then be less
Primary Subject
Source
1985; 7 p; Conference on antinucleon and nucleon-nucleus interactions; Telluride, CO (USA); 18-21 Mar 1985; CONF-850315--3; Available from NTIS, PC A02/MF A01 as DE85011837
Record Type
Report
Literature Type
Conference; Numerical Data
Report Number
Country of publication
BARYON REACTIONS, DATA, DETECTION, ELEMENTARY PARTICLES, ENERGY RANGE, FERMIONS, HADRON REACTIONS, INFORMATION, LEPTONS, MASSLESS PARTICLES, MEV RANGE, NEUTRINOS, NUCLEAR REACTIONS, NUCLEON REACTIONS, NUMERICAL DATA, RADIATION DETECTION, RADIATIONS, SOLAR PARTICLES, SOLAR RADIATION, STELLAR RADIATION, TARGETS
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AbstractAbstract
[en] Theoretical calculations for magnetic moments of T = O collective states in N = Z nuclei are compared with recent experimental results. The Jsup(π) = 2+ and 3- states considered all have 0.49 < gsub(theor) < 0.51 if the wavefunctions have pure T = O isospin. Isospin mixing increases the calculated 16O 3-g factor by 9%, consistent with experiment, but has a much smaller effect on the 2+ states. A reported negative experimental g factor for the 4+ state in 20Ne is in complete disagreement with theory. (author)
Primary Subject
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Journal Article
Literature Type
Numerical Data
Journal
Journal of Physics. G, Nuclear Physics; ISSN 0305-4616;
; v. 8(5); p. 679-685

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Adelberger, E.G.; Osborne, J.L.; Swanson, H.E.; Brown, B.A.
Washington Univ., Seattle (USA). Nuclear Physics Lab.; Michigan State Univ., East Lansing (USA). Cyclotron Lab1983
Washington Univ., Seattle (USA). Nuclear Physics Lab.; Michigan State Univ., East Lansing (USA). Cyclotron Lab1983
AbstractAbstract
[en] The intensities of γ-rays emitted following the β+ decays of 39Ca and 35Ar were measured by using a Ge(Li) detector to detect the delayed radiation from a KCl target bombarded by 13-MeV protons. From these results the experimental log(ft) values and related B(GT) values for the 35Ar and 39Ca decays are deduced. These are compared with shell-model calculations together with a recent computation by Towner and Khanna of the higher-order corrections due to configuration-mixing outside the sd shell, isobar currents and other meson-exchange currents. We concentrate on the significance of the l-forbidden 1d/sub 3/2/ - 2s/sub 1/2/ Gamow-Teller transition in mass 39 and comment on its relation to the corresponding M1 transitions in 39Ca and 39K. 38 references
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Secondary Subject
Source
1983; 37 p; Available from NTIS, PC A03/MF A01 as DE84001547
Record Type
Report
Literature Type
Numerical Data
Report Number
Country of publication
ARGON ISOTOPES, BETA DECAY, BETA DECAY RADIOISOTOPES, BETA-PLUS DECAY RADIOISOTOPES, CALCIUM ISOTOPES, CHLORINE ISOTOPES, DATA, DECAY, EVEN-ODD NUCLEI, INFORMATION, ISOTOPES, LIGHT NUCLEI, MULTIPOLE TRANSITIONS, NUCLEAR DECAY, NUCLEI, NUMERICAL DATA, ODD-EVEN NUCLEI, POTASSIUM ISOTOPES, RADIOISOTOPES, SECONDS LIVING RADIOISOTOPES, SPECTRA, SPECTROSCOPY, STABLE ISOTOPES
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Snover, K.A.; Adelberger, E.G.; Ikossi, P.G.; Brown, B.A.
Washington Univ., Seattle (USA). Nuclear Physics Lab.; Oxford Univ. (UK). Nuclear Physics Lab.; Michigan State Univ., East Lansing (USA). Cyclotron Lab1982
Washington Univ., Seattle (USA). Nuclear Physics Lab.; Oxford Univ. (UK). Nuclear Physics Lab.; Michigan State Univ., East Lansing (USA). Cyclotron Lab1982
AbstractAbstract
[en] We have measured excitation functions of the ß-rays resulting from the bombardment of 15N by polarized and unpolarized protons in the energy range Ep = 2.5 to 9.5 MeV with emphasis on identifying dipole decays to the first (0+) and second (3-) excited states in 16O. Resonances in ß12 are observed at Ex = 16.21, 16.45, 16.82, 17.12, 18.03, 18.98, 19.90 and 20.41 MeV. The 16.21 and 17.12 MeV resonances in ß12 are identified as M1-decays of the 1+ T = 1 states to the 6.05 MeV 0+ state in 16O. The measured ratio of reduced strengths B(m1,ß1)/(B(M1,ß0) is 0.48 +- 0.03 for decays from the 16.21 MeV state and 0.55 +- 0.04 for decays from the 17.12 MeV state. The 18.03 MeV resonance is due to a 3- T = 1 state in 16O with a strength GammapGammagamma 2Gamma = (1.96 +- 0.27) eV and the 18.98 MeV resonance is due to the 4- T = 1 stretched particle-hole state with a strength of (0.85 +- 0.10) eV. We determine absolute particle and ß widths for these states. The M1 ß2-width of the 18.98 MeV state, (7.1 +- 3.1) eV, is in agreement with a shell-model calculation. Resonances in ß3 are observed at 16.82 and 17.27 MeV and in ß4 at 17.88 MeV. The excitation energies and widths of these levels as well as the strengths of the ß transitions suggest T = 1 character for all of the resonances for which capture ß-rays are observed. Correspondences of our resonances to levels in 16N are given. We compare ß widths, including ground-state M1 decays, and allowed ß transition rate in A = 16 nuclei with shell model calculations and obtain rough agreement. Additional shell model calculations for M1 and GT (Gamow-Teller) decays in the A-14, 15, 17 and 18 nuclei are presented, which indicate that GT matrix elements are quenched by approx. 20% relative to shell model predictions and also relative to the spin part of the M1 matrix elements
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Source
1982; 77 p; Available from NTIS, PC A05/MF A01; 1 as DE83011480
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Report
Literature Type
Numerical Data
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Country of publication
CAPTURE, CROSS SECTIONS, E1-TRANSITIONS, ENERGY LEVELS, ENERGY-LEVEL TRANSITIONS, EXCITATION FUNCTIONS, EXPERIMENTAL DATA, GAMMA RADIATION, GAMMA SPECTRA, GAMOW-TELLER RULES, M1-TRANSITIONS, MEV RANGE 01-10, NITROGEN 15 TARGET, NITROGEN 16, OXYGEN 16, POLARIZED BEAMS, PROTON REACTIONS, RESONANCE, SHELL MODELS, STRENGTH FUNCTIONS, THEORETICAL DATA
BARYON REACTIONS, BEAMS, BETA DECAY RADIOISOTOPES, BETA-MINUS DECAY RADIOISOTOPES, DATA, ELECTROMAGNETIC RADIATION, ENERGY RANGE, EVEN-EVEN NUCLEI, FUNCTIONS, HADRON REACTIONS, INFORMATION, IONIZING RADIATIONS, ISOTOPES, LIGHT NUCLEI, MATHEMATICAL MODELS, MEV RANGE, MULTIPOLE TRANSITIONS, NITROGEN ISOTOPES, NUCLEAR MODELS, NUCLEAR REACTIONS, NUCLEI, NUCLEON REACTIONS, NUMERICAL DATA, ODD-ODD NUCLEI, OXYGEN ISOTOPES, RADIATIONS, RADIOISOTOPES, SECONDS LIVING RADIOISOTOPES, SPECTRA, STABLE ISOTOPES, TARGETS
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