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Title: Unifying measurement of Pu 239 ( n , γ ) in the keV to MeV energy regime

Abstract

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.

Authors:
 [1];  [1];  [1];  [2];  [1];  [1];  [3];  [3]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of Massachusetts, Lowell, MA (United States). Dept. of Physics and Applied Physics
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1483507
Alternate Identifier(s):
OSTI ID: 1434351; OSTI ID: 1455403
Report Number(s):
LLNL-JRNL-739052; LA-UR-18-22554
Journal ID: ISSN 2469-9985; PRVCAN; 892367; TRN: US1901232
Grant/Contract Number:  
AC52-07NA27344; AC52-06NA25396; 89233218CNA000001
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 97; Journal Issue: 4; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

Mosby, S., Bredeweg, T. A., Couture, A., Jandel, M., Kawano, T., Ullmann, J. L., Henderson, R. A., and Wu, C. Y. Unifying measurement of Pu239(n,γ) in the keV to MeV energy regime. United States: N. p., 2018. Web. doi:10.1103/PhysRevC.97.041601.
Mosby, S., Bredeweg, T. A., Couture, A., Jandel, M., Kawano, T., Ullmann, J. L., Henderson, R. A., & Wu, C. Y. Unifying measurement of Pu239(n,γ) in the keV to MeV energy regime. United States. doi:10.1103/PhysRevC.97.041601.
Mosby, S., Bredeweg, T. A., Couture, A., Jandel, M., Kawano, T., Ullmann, J. L., Henderson, R. A., and Wu, C. Y. Mon . "Unifying measurement of Pu239(n,γ) in the keV to MeV energy regime". United States. doi:10.1103/PhysRevC.97.041601. https://www.osti.gov/servlets/purl/1483507.
@article{osti_1483507,
title = {Unifying measurement of Pu239(n,γ) in the keV to MeV energy regime},
author = {Mosby, S. and Bredeweg, T. A. and Couture, A. and Jandel, M. and Kawano, T. and Ullmann, J. L. and Henderson, R. A. and Wu, C. Y.},
abstractNote = {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.},
doi = {10.1103/PhysRevC.97.041601},
journal = {Physical Review C},
issn = {2469-9985},
number = 4,
volume = 97,
place = {United States},
year = {2018},
month = {4}
}

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