Prompt-fission-neutron spectra in the 239Pu(n,f) reaction

Marini, P.; Taieb, J.; Laurent, B.; Belier, G.; Chatillon, A.; Etasse, D.; Morfouace, P.; Devlin, M.; Gomez, J. A.; Haight, R. C.; Kelly, K. J.; O'Donnell, J. M.; Schmitt, K. T.

doi:10.1103/physrevc.101.044614

Title: Prompt-fission-neutron spectra in the ²³⁹Pu(n,f) reaction

Journal Article · Mon Apr 27 00:00:00 EDT 2020 · Physical Review C

DOI:https://doi.org/10.1103/physrevc.101.044614· OSTI ID:1726181

^[1]; Taieb, J. ^[1];

^[1]; Belier, G. ^[1]; Chatillon, A. ^[1]; Etasse, D. ^[2]; Morfouace, P. ^[1];

^[3];

^[3]; Haight, R. C. ^[3];

^[3]; O'Donnell, J. M. ^[3]; Schmitt, K. T. ^[3]

Atomic Energy Commission (CEA), Arpajon (France)
Univ. de Caen (France)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Prompt-fission-neutron spectra from ${}_{239}{Pu}$ ( $n, f$ ) were measured with respect to ${}_{252}{Cf}$ spontaneous fission for incident neutron energies from 0.7 to $700 MeV$ at the Weapons Neutron Research facility (WNR) of the Los Alamos Neutron Science Center. A newly designed high-efficiency fission chamber was coupled to the highly segmented Chi-Nu neutron liquid scintillator array to detect neutrons emitted in fission events. The double time-of-flight technique was used to deduce the incident neutron energies from the spallation target and the outgoing-neutron energies from the fission chamber. Prompt-fission-neutron spectra (PFNS) were measured with respect to ${}_{252}{Cf}$ spontaneous fission down to $200 keV$ and up to about $12 MeV$ for all the incident neutron energies with typical total uncertainties well below $2 %$ up to about 7-MeV outgoing-neutron energy. The general trend of PFNS is well reproduced by JEFF3.3 and ENDF evaluations, although a better agreement is found with JEFF3.3. Discrepancies were observed for the low-energy part of the spectra, especially around the opening of the second-, third- and fourth-chance fission. Additionally, neutron average kinetic energies as a function of incident neutron energy are obtained experimentally with reported total uncertainties below $0.5 %$ . The measured values agree with the most recent data. The trend is fairly well reproduced by the JEFF3.3 evaluation, although it fails to reproduce the experimental values within their uncertainties.

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

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

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

OSTI ID:: 1726181

Report Number(s):: LA-UR-19-31206; TRN: US2205076

Journal Information:: Physical Review C, Vol. 101, Issue 4; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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