Influence of nonstatistical properties in nuclear structure on emission of prompt fission neutrons

Kawano, T.; Okumura, S.; Lovell, A. E.; Stetcu, I.; Talou, P.

doi:10.1103/physrevc.104.014611

Title: Influence of nonstatistical properties in nuclear structure on emission of prompt fission neutrons

Journal Article · 15 July 2021 · Physical Review. C

DOI: https://doi.org/10.1103/physrevc.104.014611 · OSTI ID:1884756

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Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
International Atomic Energy Agency (IAEA), Vienna (Austria)

We report the Hauser-Feshbach fission-fragment decay (HF³D) model is extended to calculate the prompt fission neutron spectrum (PFNS) for the thermal-neutron-induced fission on ²³⁵U, where the evaporated neutrons from all possible fission-fragment pairs are aggregated. By studying model parameter sensitivities on the calculated PFNS as well as nonstatistical behavior of low-lying discrete level spin distribution, we conclude that discrepancies between the aggregation calculation and the experimental PFNS seen at higher neutron emission energies can be attributed to both the primary fission-fragment yield distribution and the possible high spin states that are not predicted by the statistical theory of nuclear structure.

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

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation; USDOE National Nuclear Security Administration (NNSA), Nuclear Criticality Safety Program (NCSP)

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1884756

Report Number(s):: LA-UR-21-22687; TRN: US2308110

Journal Information:: Physical Review. C, Vol. 104, Issue 1; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Influence of nonstatistical properties in nuclear structure on emission of prompt fission neutrons

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References (31)

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