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Title: Energy dependence of the prompt γ -ray emission from the ( d , p ) -induced fission of U * 234 and Pu * 240

Prompt-fission γ rays are responsible for approximately 5% of the total energy released in fission, and therefore important to understand when modeling nuclear reactors. In this work we present prompt γ-ray emission characteristics in fission as a function of the nuclear excitation energy of the fissioning system. Emitted γ-ray spectra were measured, and γ-ray multiplicities and average and total γ energies per fission were determined for the 233U(d,pf) reaction for excitation energies between 4.8 and 10 MeV, and for the 239Pu(d,pf) reaction between 4.5 and 9 MeV. The spectral characteristics show no significant change as a function of excitation energy above the fission barrier, despite the fact that an extra ~5 MeV of energy is potentially available in the excited fragments for γ decay. The measured results are compared with model calculations made for prompt γ-ray emission with the fission model code gef. In conclusion, further comparison with previously obtained results from thermal neutron induced fission is made to characterize possible differences arising from using the surrogate (d,p) reaction.
Authors:
 [1] ;  [1] ;  [2] ;  [3] ;  [4] ;  [1] ;  [1] ;  [5] ;  [6] ;  [7] ;  [1] ;  [8] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [9] ;  [1] more »;  [1] ;  [1] ;  [10] ;  [1] ;  [11] « less
  1. Univ. of Oslo, Oslo (Norway)
  2. CNRS/Univ. Paris-Sud, Univ. Paris Saclay, Orsay Cedex (France)
  3. Extreme Light Infrastructure - Nuclear Physics (ELI-NP), Bucharest-Magurele (Romania)
  4. European Commission, Geel (Belgium)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
  6. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  7. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  8. Univ. of Oslo, Oslo (Norway); Helmholtz Institute Mainz, Mainz (Germany); GSI Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany)
  9. Univ. of California, Berkeley, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  10. Grand Accelerateur National d'lons Lourd (France)
  11. iThemba LABS, Somerset West (South Africa)
Publication Date:
Report Number(s):
LLNL-JRNL-737322
Journal ID: ISSN 2469-9985; PRVCAN
Grant/Contract Number:
AC52-07NA27344; AC02-05CH11231
Type:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 96; Journal Issue: 1; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
OSTI Identifier:
1378551
Alternate Identifier(s):
OSTI ID: 1368426