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Nuclear level density and γ -decay strength of Sr 93

Journal Article · · Physical Review. C
 [1];  [1];  [1];  [2];  [3];  [2];  [3];  [4];  [5];  [3];  [3];  [3];  [3];  [3];  [1];  [3];  [3];  [4];  [6]
  1. Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
  2. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
  3. Michigan State Univ., East Lansing, MI (United States)
  4. Univ. of California, Berkeley, CA (United States)
  5. Univ. of Oslo (Norway)
  6. iThemba LABS, Somerset West (South Africa); Univ. of the Witwatersrand, Johannesburg (South Africa); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
+ Show Author Affiliations
This work presents the first experimentally determined nuclear level density and γ-ray strength function of the short-lived fission product 93Sr, accomplished using the β-Oslo method. Direct measurement of the 92Sr(n, γ) 93Sr cross section is not currently possible, as the half-life of 2.66 hours is too short; instead, 93Sr was formed through β decay of 93Rb to excitation energies around the neutron separation energy. The γ-ray spectra were measured using a total absorption spectrometer at the National Superconducting Cyclotron Laboratory (NSCL) at Michigan State University (MSU). The statistical properties of the 93Sr nucleus were experimentally determined, including the γ-ray strength function and nuclear level density. At low energies, the γ-ray strength function exhibits a constant γ-decay strength, rather than a slightly increasing strength with decreasing γ-ray energy as had been previously observed for several nuclei in this mid-mass region. Finally, these statistical properties were then implemented in the reaction code TALYS1.95 to calculate the 92Sr(n, γ) 93Sr cross section.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Nuclear Physics (NP)
Grant/Contract Number:
AC02-05CH11231; AC52-07NA27344; NA0000979; NA0003180; NA0003906; NA0003996; SC0020451
OSTI ID:
2382872
Alternate ID(s):
OSTI ID: 2356922
Report Number(s):
LLNL--JRNL-832095; 1049259
Journal Information:
Physical Review. C, Journal Name: Physical Review. C Journal Issue: 5 Vol. 109; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
Beta decay
Energy levels
Gamma-ray strength functions
Level densities
Models & methods for nuclear reactions
Nuclear astrophysics
Nuclear decay
Nuclear reaction rates
Nuclear structure & decays
Radiative capture