Energy dependent calculations of fission product, prompt, and delayed neutron yields for neutron induced fission on 235U, 238U, and 239Pu

Okumura, Shin; Kawano, Toshihiko; Lovell, Amy Elizabeth; Yoshida, Tadashi

doi:10.1080/00223131.2021.1954103

Title: Energy dependent calculations of fission product, prompt, and delayed neutron yields for neutron induced fission on ²³⁵U, ²³⁸U, and ²³⁹Pu

Journal Article · Sun Sep 05 00:00:00 EDT 2021 · Journal of Nuclear Science and Technology (Tokyo)

DOI:https://doi.org/10.1080/00223131.2021.1954103· OSTI ID:1900219

^[1];

^[2];

^[2]; Yoshida, Tadashi ^[3]

International Atomic Energy Agency (IAEA), Vienna (Austria)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Tokyo Institute of Technology (Japan)

In this article, we perform energy-dependent calculations of independent and cumulative fission product yields for ²³⁵U, ²³⁸U, and ²³⁹Pu in the first chance fission region. Starting with the primary fission fragment distributions taken from available experimental data and analytical functions based on assumptions for the excitation energy and spin-parity distributions, the Hauser-Feshbach statistical decay treatment for fission fragment de-excitation is applied to more than 1,000 fission fragments for the incident neutron energies up to 5 MeV. The calculated independent yields are then used as an input of β-decay calculations to produce the cumulative yield, and summation calculations are performed. Model parameters in these procedures are adjusted by applying the Bayesian technique at the thermal energy for ²³⁵U and ²³⁹Pu and in the fast energy range for ²³⁸U. The calculated fission observable quantities, such as the energy-dependent cumulative yields, and prompt and delayed neutron yields, are compared with available experimental data. We also study the possible impact of the second chance fission opening on the energy dependence of the delayed neutron yield by on the opening of second chance fission on the energy dependence calculation.

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

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA), Nuclear Criticality Safety Program (NCSP)

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1900219

Report Number(s):: LA-UR-21-20820; TRN: US2311018

Journal Information:: Journal of Nuclear Science and Technology (Tokyo), Vol. 59, Issue 1; ISSN 0022-3131

Publisher:: Taylor & FrancisCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Energy dependent calculations of fission product, prompt, and delayed neutron yields for neutron induced fission on 235U, 238U, and 239Pu

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Title: Energy dependent calculations of fission product, prompt, and delayed neutron yields for neutron induced fission on ²³⁵U, ²³⁸U, and ²³⁹Pu