Measurement of the 238U(n,f) prompt fission neutron spectrum from 10 keV to 10 MeV induced by neutrons with 1.5–20 MeV energy

Kelly, Keegan John; Devlin, Matthew James; O'Donnell, John M.; Neudecker, Denise; Lovell, Amy Elizabeth; Haight, Robert Cameron; Wu, Ching-Yen; Henderson, Roger; Bennett, Eames Alexander; Kawano, Toshihiko; Ullmann, John Leonard; Fotiades, Nikolas; Henderson, Jack; Mosby, Shea Morgan; Taddeucci, Terry Nicholas; Talou, Patrick; White, Morgan Curtis; Gomez, Jamie A.; Lee, Hye Young

doi:10.1103/physrevc.108.024603

Measurement of the ²³⁸U(n,f) prompt fission neutron spectrum from 10 keV to 10 MeV induced by neutrons with 1.5–20 MeV energy

Journal Article · Mon Aug 14 04:00:00 EDT 2023 · Physical Review. C

DOI:https://doi.org/10.1103/physrevc.108.024603· OSTI ID:1995436

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Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

With the recent emergence of fast nuclear reactors, there has been a corresponding increasing interest in ²³⁸U-related nuclear data. However, while existing literature data span much of the energy ranges of interest for the prompt fission neutron spectrum (PFNS) for neutron-induced fission of 238U, most literature data sets are highly correlated, and thus new, independent measurements of this quantity are needed. In this work, we report the results of a new measurement of the²³⁸U PFNS at the Los Alamos Neutron Science Center for incident neutron energies from 1.5–20.0 MeV, and outgoing neutron energies of 0.01–10.0 MeV. With some notable exceptions, the present results generally agree with existing literature data, especially with regard to features relating to multichance fission and pre-equilibrium features in the PFNS, thus adding confidence to existing nuclear data evaluations and filling in gaps of knowledge at previously unmeasured incident neutron energies. This result is the third in a series of PFNS measurements by the Chi-Nu collaboration now spanning all three major actinides, ²³⁹Pu, ²³⁵U, and ²³⁸U. Thus, for the first time, we report reliable experimental PFNS ratios and average PFNS energy comparisons for measurements of all three of these isotopes including accurate correlations between the different, but correlated experiments.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

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

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

OSTI ID:: 1995436

Alternate ID(s):: OSTI ID: 2008290

Report Number(s):: LLNL-JRNL-844413; 1067602

Journal Information:: Physical Review. C, Journal Name: Physical Review. C Journal Issue: 2 Vol. 108; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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