New prompt fission neutron spectra measurements in the 238 U(n,f) reaction with a dedicated setup at LANSCE/WNR

Laurent, Benoit; Marini, Paola; Belier, Gilbert; Bonnet, Thomas; Chatillon, Audrey; Taieb, Julien; Etasse, David; Devlin, Matthew James; Haight, Robert Cameron

doi:10.1051/epjconf/201714604014

Title: New prompt fission neutron spectra measurements in the ²³⁸ U(n,f) reaction with a dedicated setup at LANSCE/WNR

Journal Article · Wed Sep 13 00:00:00 EDT 2017 · EPJ Web of Conferences

DOI:https://doi.org/10.1051/epjconf/201714604014· OSTI ID:1463567

Laurent, Benoit ^[1]; Marini, Paola ^[1]; Belier, Gilbert ^[1]; Bonnet, Thomas ^[1]; Chatillon, Audrey ^[1]; Taieb, Julien ^[1]; Etasse, David ^[2];

^[3]; Haight, Robert Cameron ^[3]

Alternative Energies and Atomic Energy Commission (CEA), Arpajon (France). Directorate of Military Applications (DAM)
Univ. de Caen, Caen (France). Lab. de Physique Corpusculaire de Caen, ENSICAEN
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

A new prompt fission neutron spectra (PFNS) measurement in the ²³⁸U(n,f) reaction was performed at LANSCE/WNR facility. Evaluated data show discrepancies on the low (below 1 MeV) and high (above 5 MeV) energy parts in the PFNS for different major and minor actinides. The goal is to improve these measurements in a wide range of incident energy. The energy of the incoming neutron, inducing the fission, and the prompt neutron energies, are measured by time-of-flight method. A dedicated fission chamber was developed, in order to improve alpha-fission discrimination, timing resolution, actinide mass, and to reduce the amount of neutron scattering. To detect prompt neutrons, the 54 Chi-Nu scintillator cells array were surrounding the fission chamber. High statistics were recorded during this experiment, allowing a precise study of PFNS behavior as a function of incident neutron energy, from 1 MeV to 200 MeV. In conclusion, this experiment also showed that all the new tools developed to improve PFNS measurements are performing. Therefore, measurements of PFNS with others actinides such as ²³⁹Pu are planned.

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Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP)

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1463567

Report Number(s):: LA-UR-18-25951; TRN: US1902318

Journal Information:: EPJ Web of Conferences, Vol. 146; Conference: 2016 International Conference on Nuclear Data for Science and Technology, ND 2016 , Bruges (Belgium), 11 Sep 2016; ISSN 2100-014X

Publisher:: EDP SciencesCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 3 works

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References (8)

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