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Title: Sensitivity of an (α,n) neutron source to (α,n) cross sections and stopping powers

Abstract

The first-order sensitivities of the (α,n) neutron source rate density in a homogeneous material to isotopic (α,n) cross sections, elemental electronic stopping power data, and general coefficients for the nuclear stopping power are derived for the total neutron source and the energy-dependent neutron source. The physics bases for some of the equations in the SOURCES4C calculation of the stopping power are briefly discussed. The derivatives have been implemented in SOURCES4C. In simple PuO2 and PuB2 test problems, the computed derivatives compare extremely well with central differences. As a result, the first-order sensitivities are applied to show that improving the value of one of SOURCES4C’s stopping-power coefficients changes the (α,n) neutron source rate by 1.738 × 10–6% in the PuO2 problem.

Authors:
 [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). Office of Defense Nuclear Nonproliferation R&D (NA-22)
OSTI Identifier:
1604039
Report Number(s):
LA-UR-19-27042
Journal ID: ISSN 0306-4549
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
Annals of Nuclear Energy (Oxford)
Additional Journal Information:
Journal Name: Annals of Nuclear Energy (Oxford); Journal Volume: 138; Journal Issue: C; Journal ID: ISSN 0306-4549
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; (α,n) neutron source; Sensitivity; SOURCES4C; Stopping power; Plutonium oxide; Plutonium boride

Citation Formats

Favorite, Jeffrey A. Sensitivity of an (α,n) neutron source to (α,n) cross sections and stopping powers. United States: N. p., 2019. Web. https://doi.org/10.1016/j.anucene.2019.107154.
Favorite, Jeffrey A. Sensitivity of an (α,n) neutron source to (α,n) cross sections and stopping powers. United States. https://doi.org/10.1016/j.anucene.2019.107154
Favorite, Jeffrey A. Fri . "Sensitivity of an (α,n) neutron source to (α,n) cross sections and stopping powers". United States. https://doi.org/10.1016/j.anucene.2019.107154. https://www.osti.gov/servlets/purl/1604039.
@article{osti_1604039,
title = {Sensitivity of an (α,n) neutron source to (α,n) cross sections and stopping powers},
author = {Favorite, Jeffrey A.},
abstractNote = {The first-order sensitivities of the (α,n) neutron source rate density in a homogeneous material to isotopic (α,n) cross sections, elemental electronic stopping power data, and general coefficients for the nuclear stopping power are derived for the total neutron source and the energy-dependent neutron source. The physics bases for some of the equations in the SOURCES4C calculation of the stopping power are briefly discussed. The derivatives have been implemented in SOURCES4C. In simple PuO2 and PuB2 test problems, the computed derivatives compare extremely well with central differences. As a result, the first-order sensitivities are applied to show that improving the value of one of SOURCES4C’s stopping-power coefficients changes the (α,n) neutron source rate by 1.738 × 10–6% in the PuO2 problem.},
doi = {10.1016/j.anucene.2019.107154},
journal = {Annals of Nuclear Energy (Oxford)},
number = C,
volume = 138,
place = {United States},
year = {2019},
month = {12}
}

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