Calculated covariance matrices for fission product yields using BeoH

Lovell, Amy Elizabeth; Kawano, Toshihiko; Talou, Patrick

doi:10.1051/epjconf/202328100018

Title: Calculated covariance matrices for fission product yields using BeoH

Journal Article · Wed Mar 29 00:00:00 EDT 2023 · EPJ Web of Conferences (Online)

DOI:https://doi.org/10.1051/epjconf/202328100018· OSTI ID:1968216

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

Fission product yields (FPY) are important for a variety of applications (reactor neutronics, spent fuel, dosimetry, radiochemistry, etc.) and are currently included in many of the evaluated libraries around the world. The FPYs in the current US evaluation, ENDF/B-VIII.0, are mainly based on the 1994 evaluation of England and Rider and have only had slight updates—such as the inclusion of a 2 MeV point for ²³⁹Pu—since their development. Additionally, only mean values and uncertainties are included in the evaluation, not full correlations. Los Alamos National Laboratory, in collaboration with several other institutes, has been working on an updated evaluation for the FPYs of ²³⁹Pu(n,f), ²³⁵U(n,f), ²³⁸U(n,f), and ²⁵²Cf(sf) using the deterministic, Hauser-Feshbach, fission fragment decay code, BeoH. BeoH calculates the FPYs consistently with many other prompt and delayed fission observables, explicitly taking into account multi-chance fission and ensuring consistency between observables. In addition to providing updated means and uncertainties for the FPYs on a pointwise energy grid from thermal to 20 MeV, we calculate correlations between all FPYs at each incident energy and across incident energies. Here, we discuss the development of these covariance matrices, differences in the correlations between FPYs based on the parameters that are included in the model optimization, and correlations across incident energies for neutron-induced fission.

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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

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1968216

Report Number(s):: LA-UR-22-31101; TRN: US2313305

Journal Information:: EPJ Web of Conferences (Online), Vol. 281; ISSN 2100-014X

Publisher:: EDP SciencesCopyright Statement

Country of Publication:: United States

Language:: English

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