Unifying measurement of Pu239(n,γ) in the keV to MeV energy regime

Mosby, S.; Bredeweg, T. A.; Couture, A.; Jandel, M.; Kawano, T.; Ullmann, J. L.; Henderson, R. A.; Wu, C. Y.

doi:10.1103/PhysRevC.97.041601

Unifying measurement of ${}^{239}{Pu} (n, γ)$ in the keV to MeV energy regime

Journal Article · Mon Apr 23 00:00:00 EDT 2018 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.97.041601· OSTI ID:1455403

Mosby, S. ^[1]; Bredeweg, T. A. ^[1]; Couture, A. ^[1]; Jandel, M. ^[2]; Kawano, T. ^[1]; Ullmann, J. L. ^[1]; Henderson, R. A. ^[3]; Wu, C. Y. ^[3]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of Massachusetts, Lowell, MA (United States). Dept. of Physics and Applied Physics
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

A single, unifying measurement of the ²³⁹Pu capture cross section from 1 keV to 1.3 MeV has been performed for the first time using the Detector for Advanced Neutron Capture Experiments (DANCE) at the Los Alamos Neutron Science Center (LANSCE). The experimental method combines a prior experiment's characterization of prompt fission γ rays in conjunction with a fission tagging detector with a separate experiment using a thick ²³⁹Pu sample to extract the neutron capture cross section in ratio to ²³⁹Pu (n, f). We have made new predictions of the capture cross section taking into account recent results for the M1 scissors mode present in other actinides. The results show deviations from current evaluations which are 30% higher at the highest energies, and will be used to improve calculations relevant for several applications.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE; USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: 89233218CNA000001; AC52-06NA25396; AC52-07NA27344

OSTI ID:: 1455403

Alternate ID(s):: OSTI ID: 1434351
OSTI ID: 1483507

Report Number(s):: LA-UR--18-22554; LLNL-JRNL--739052; 892367

Journal Information:: Physical Review C, Journal Name: Physical Review C Journal Issue: 4 Vol. 97; ISSN PRVCAN; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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