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Title: Energy dependence of fission product yields from 235U, 238U, and 239Pu with monoenergetic neutrons between thermal and 14.8 MeV

Under a joint collaboration between TUNL-LANL-LLNL, a set of absolute fission product yield measurements has been performed. The energy dependence of a number of cumulative fission product yields (FPY) have been measured using quasi-monoenergetic neutron beams for three actinide targets, 235U, 238U and 239Pu, between 0.5 and 14.8 MeV. The FPYs were measured by a combination of fission counting using specially designed dual-fission chambers and γ-ray counting. Each dual-fission chamber is a back-to-back ionization chamber encasing an activation target in the center with thin deposits of the same target isotope in each chamber. This method allows for the direct measurement of the total number of fissions in the activation target with no reference to the fission cross-section, thus reducing uncertainties. γ-ray counting of the activation target was performed on well-shielded HPGe detectors over a period of two months post irradiation to properly identify fission products. Reported are absolute cumulative fission product yields for incident neutron energies of 0.5, 1.37, 2.4, 3.6, 4.6, 5.5, 7.5, 8.9 and 14.8 MeV. Preliminary results from thermal irradiations at the MIT research reactor will also be presented and compared to present data and evaluations.
Authors:
 [1] ;  [1] ;  [2] ;  [1] ;  [3] ;  [2] ;  [4] ;  [2] ;  [4] ;  [1] ;  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Duke Univ., Durham, NC (United States); Triangle Univ. Nuclear Lab., Durham, NC (United States)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Duke Univ., Durham, NC (United States); Triangle Univ. Nuclear Lab., Durham, NC (United States)
  4. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Report Number(s):
LA-UR-16-28547
Journal ID: ISSN 2100-014X; TRN: US1800395
Grant/Contract Number:
AC52-06NA25396; AC52-07NA27344; FG52-09NA29465; FG52-09NA29448; FG02-97ER41033
Type:
Accepted Manuscript
Journal Name:
EPJ Web of Conferences
Additional Journal Information:
Journal Volume: 146; Conference: International Conference on Nuclear Data and Technology, Bruges (Belgium), 9-11 Sep 2016; Journal ID: ISSN 2100-014X
Publisher:
EDP Sciences
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Duke Univ., Durham, NC (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
OSTI Identifier:
1412888