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Title: Identifying Inconsistencies in Fission Product Yield Evaluations with Prompt Neutron Emission

Abstract

Here, we present a self-consistency analysis of fission product yield evaluations. Anomalous yields are determined using a series of simple conservation checks and comparing charge distributions with common parameterizations. The summed average prompt neutron multiplicity for both products as a function of the heavy product mass is derived directly from the independent fission product yields with a procedure utilizing average charge conservation. This procedure is validated with Monte Carlo simulations of the de-excitation of the fission fragments in a Hauser-Feshbach statistical decay framework. The derived is compared with experimental data, when available, and then used to determine the prompt neutron multiplicity for the various evaluations. The propagated errors on from the average charge conservation method are significantly lower than the simple summation rules, which reveals that some evaluations are inconsistent with prompt neutron data. We propose possible solutions to remedy the observed inconsistencies and identify sources of the observed differences in between the various evaluation libraries.

Authors:
ORCiD logo [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1492607
Report Number(s):
LA-UR-17-27790
Journal ID: ISSN 0029-5639
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Science and Engineering
Additional Journal Information:
Journal Volume: 190; Journal Issue: 3; Journal ID: ISSN 0029-5639
Publisher:
American Nuclear Society - Taylor & Francis
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Atomic and Nuclear Physics; Yield evaluations; fission product yields; prompt neutron emission

Citation Formats

Jaffke, Patrick. Identifying Inconsistencies in Fission Product Yield Evaluations with Prompt Neutron Emission. United States: N. p., 2018. Web. doi:10.1080/00295639.2018.1429173.
Jaffke, Patrick. Identifying Inconsistencies in Fission Product Yield Evaluations with Prompt Neutron Emission. United States. doi:10.1080/00295639.2018.1429173.
Jaffke, Patrick. Wed . "Identifying Inconsistencies in Fission Product Yield Evaluations with Prompt Neutron Emission". United States. doi:10.1080/00295639.2018.1429173. https://www.osti.gov/servlets/purl/1492607.
@article{osti_1492607,
title = {Identifying Inconsistencies in Fission Product Yield Evaluations with Prompt Neutron Emission},
author = {Jaffke, Patrick},
abstractNote = {Here, we present a self-consistency analysis of fission product yield evaluations. Anomalous yields are determined using a series of simple conservation checks and comparing charge distributions with common parameterizations. The summed average prompt neutron multiplicity for both products as a function of the heavy product mass is derived directly from the independent fission product yields with a procedure utilizing average charge conservation. This procedure is validated with Monte Carlo simulations of the de-excitation of the fission fragments in a Hauser-Feshbach statistical decay framework. The derived is compared with experimental data, when available, and then used to determine the prompt neutron multiplicity for the various evaluations. The propagated errors on from the average charge conservation method are significantly lower than the simple summation rules, which reveals that some evaluations are inconsistent with prompt neutron data. We propose possible solutions to remedy the observed inconsistencies and identify sources of the observed differences in between the various evaluation libraries.},
doi = {10.1080/00295639.2018.1429173},
journal = {Nuclear Science and Engineering},
number = 3,
volume = 190,
place = {United States},
year = {2018},
month = {3}
}

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