Evaluation of the ²³⁹Pu prompt fission neutron spectrum induced by neutrons of 500 keV and associated covariances

Neudecker, D.; Talou, P.; Kawano, T.; Smith, D. L.; Capote, R.; Rising, M. E.; Kahler, A. C.

doi:10.1016/j.nima.2015.04.044

Title: Evaluation of the ²³⁹Pu prompt fission neutron spectrum induced by neutrons of 500 keV and associated covariances

Journal Article · Sat Aug 01 00:00:00 EDT 2015 · Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment

DOI:https://doi.org/10.1016/j.nima.2015.04.044· OSTI ID:1193393

Neudecker, D. ^[1]; Talou, P. ^[1]; Kawano, T. ^[1]; Smith, D. L. ^[2]; Capote, R. ^[3]; Rising, M. E. ^[1]; Kahler, A. C. ^[1]

Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Proton Source (APS)
Vienna International Centre, Vienna (Austria)

We present evaluations of the prompt fission neutron spectrum (PFNS) of ²³⁹Pu induced by 500 keV neutrons, and associated covariances. In a previous evaluation by Talou et al. 2010, surprisingly low evaluated uncertainties were obtained, partly due to simplifying assumptions in the quantification of uncertainties from experiment and model. Therefore, special emphasis is placed here on a thorough uncertainty quantification of experimental data and of the Los Alamos model predicted values entering the evaluation. In addition, the Los Alamos model was extended and an evaluation technique was employed that takes into account the qualitative differences between normalized model predicted values and experimental shape data. These improvements lead to changes in the evaluated PFNS and overall larger evaluated uncertainties than in the previous work. However, these evaluated uncertainties are still smaller than those obtained in a statistical analysis using experimental information only, due to strong model correlations. Hence, suggestions to estimate model defect uncertainties are presented, which lead to more reasonable evaluated uncertainties. The calculated k_eff of selected criticality benchmarks obtained with these new evaluations agree with each other within their uncertainties despite the different approaches to estimate model defect uncertainties. The k_eff one standard deviations overlap with some of those obtained using ENDF/B-VII.1, albeit their mean values are further away from unity. Spectral indexes for the Jezebel critical assembly calculated with the newly evaluated PFNS agree with the experimental data for selected (n,γ) and (n,f) reactions, and show improvements for high-energy threshold (n,2n) reactions compared to ENDF/B-VII.1.

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

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

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1193393

Alternate ID(s):: OSTI ID: 1247271

Report Number(s):: LA-UR-14-22817; PII: S016890021500532X

Journal Information:: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 791, Issue C; ISSN 0168-9002

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 11 works

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Correlated prompt fission data in transport simulations Talou, P.; Vogt, R.; Randrup, J. The European Physical Journal A, Vol. 54, Issue 1 https://doi.org/10.1140/epja/i2018-12455-0	journal	January 2018
Correlated Prompt Fission Data in Transport Simulations Talou, P.; Vogt, R.; Randrup, J. arXiv https://doi.org/10.48550/arxiv.1710.00107	text	January 2017

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