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Title: Measurement of the energy and multiplicity distributions of neutrons from the photofission of U 235

For the first time, the complete neutron multiplicity distribution has been measured in this study from the photofission of 235U induced by high-energy spallation γ rays arriving ahead of the neutron beam at the Los Alamos Neutron Science Center. The resulting average neutron multiplicity 3.80 ± 0.08 (stat.) neutrons per photofission is in general agreement with previous measurements. In addition, unique measurements of the prompt fission energy spectrum of the neutrons from photofission and the angular correlation of two-neutron energies emitted in photofission also were made. Finally, the results are compared to calculations with the complete event fission model FREYA.
Authors:
 [1] ;  [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [5] ;  [5] ;  [6] ;  [7] ;  [7] ;  [1]
  1. Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Nuclear Engineering and Radiological Sciences
  2. Univ. of Florida, Gainesville, FL (United States). Materials Science and Engineering
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Nuclear and Chemical Sciences Division; Univ. of California, Davis, CA (United States). Dept. of Physics
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Nuclear Science Division
  5. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  6. Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab.
  7. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Nuclear and Chemical Sciences Division
Publication Date:
Report Number(s):
LLNL-JRNL-732408; LA-UR-17-24351
Journal ID: ISSN 2469-9985
Grant/Contract Number:
AC52-07NA27344; AC02-05CH11231; AC52-06NA25396; AC07-05ID14517
Type:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 95; Journal Issue: 6; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of Michigan, Ann Arbor, MI (United States)
Sponsoring Org:
USDOE Office of Nuclear Energy (NE), Nuclear Reactor Technologies (NE-7). Nuclear Engineering University Program (NEUP); USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; fission; neutron physics; nucleon induced nuclear reactions; Fission neutron multiplicity correlations
OSTI Identifier:
1366927
Alternate Identifier(s):
OSTI ID: 1364673; OSTI ID: 1429999