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Title: ( α ,n) reactions in oxide compounds calculated from the R-matrix theory

Abstract

In this paper, we present an analysis of the neutron yield and energy distribution of neutron source terms generated from the interaction of α-particles with 17,18O nuclei in fissile actinide compounds. When compared with measured data, the neutron yield and energy distribution data calculated for several isotopic configurations are used to validate the energy-dependent 17,18O(α,n) cross sections modeled by a set of resonance parameters based on the Reich-Moore approximation of the R-matrix theory. Lastly, the present analysis shows the fundamental importance of the partial contribution of the (α,n) cross sections to each excited state in determining the shape and magnitude of the calculated neutron spectra as a function of the emerging neutrons.

Authors:
ORCiD logo [1]; ORCiD logo [1];  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation (NA-20)
OSTI Identifier:
1561662
Alternate Identifier(s):
OSTI ID: 1566160
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Progress in Nuclear Energy
Additional Journal Information:
Journal Volume: 118; Journal Issue: C; Journal ID: ISSN 0149-1970
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Nuclear data; R-matrix theory; Neutron yield; Neutron energy spectra

Citation Formats

Pigni, Marco T., Gauld, Ian C., and Croft, Stephen. ( α ,n) reactions in oxide compounds calculated from the R-matrix theory. United States: N. p., 2019. Web. doi:10.1016/j.pnucene.2019.103130.
Pigni, Marco T., Gauld, Ian C., & Croft, Stephen. ( α ,n) reactions in oxide compounds calculated from the R-matrix theory. United States. doi:10.1016/j.pnucene.2019.103130.
Pigni, Marco T., Gauld, Ian C., and Croft, Stephen. Wed . "( α ,n) reactions in oxide compounds calculated from the R-matrix theory". United States. doi:10.1016/j.pnucene.2019.103130.
@article{osti_1561662,
title = {( α ,n) reactions in oxide compounds calculated from the R-matrix theory},
author = {Pigni, Marco T. and Gauld, Ian C. and Croft, Stephen},
abstractNote = {In this paper, we present an analysis of the neutron yield and energy distribution of neutron source terms generated from the interaction of α-particles with 17,18O nuclei in fissile actinide compounds. When compared with measured data, the neutron yield and energy distribution data calculated for several isotopic configurations are used to validate the energy-dependent 17,18O(α,n) cross sections modeled by a set of resonance parameters based on the Reich-Moore approximation of the R-matrix theory. Lastly, the present analysis shows the fundamental importance of the partial contribution of the (α,n) cross sections to each excited state in determining the shape and magnitude of the calculated neutron spectra as a function of the emerging neutrons.},
doi = {10.1016/j.pnucene.2019.103130},
journal = {Progress in Nuclear Energy},
number = C,
volume = 118,
place = {United States},
year = {2019},
month = {9}
}

Journal Article:
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This content will become publicly available on September 11, 2020
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