Measurement of the neutron-induced capture-to-fission cross section ratio in U 233 at LANSCE

E. Leal-Cidoncha; A. Couture; E. M. Bond; T. A. Bredeweg; C. Fry; T. Kawano; A. E. Lovell; G. Rusev; I. Stetcu; J. L. Ullmann; L. Leal; M. T. Pigni

doi:10.1103/PhysRevC.108.014608

Measurement of the neutron-induced capture-to-fission cross section ratio in U 233 at LANSCE

E. Leal-Cidoncha, A. Couture, E. M. Bond, T. A. Bredeweg, C. Fry, T. Kawano, A. E. Lovell, G. Rusev, I. Stetcu, J. L. Ullmann, L. Leal, M. T. Pigni

Nuclear Data

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2 Scopus citations

Abstract

The neutron-induced capture-to-fission cross section ratio of U233 has been measured at the Los Alamos Neutron Science Center at Los Alamos National Laboratory in the energy range from 0.7 eV to 250 keV. The detector setup combines the Detector for Advanced Neutron Capture Experiments (DANCE) to measure γ rays generated from both capture and fission reactions, and the neutron detector array at DANCE to measure fission neutrons. This is the first measurement of the capture-to-fission ratio between 2 and 30 keV. The evaluations are in good agreement with the results in the resolved resonance region. In both the unresolved resonance region and the fast neutron region, a lower capture-to-fission ratio is obtained in this work from 10 to 150 keV compared to current evaluations, while good agreement with the experimental data and the evaluations is found above 150 keV. Statistical model calculations were performed to compare with the experimental data. Significantly reduced (Γγ) was required to reproduce the measured data.

Original language	English
Article number	014608
Journal	Physical Review C
Volume	108
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevC.108.014608
State	Published - Jul 2023

Funding

This work was supported by the Nuclear Criticality Safety Program (NCSP), funded and managed by the National Nuclear Security Administration for the Department of Energy. This work benefited from the use of the Los Alamos Neutron Science Center and was supported by the US Department of Energy through the Los Alamos National Laboratory. Los Alamos National Laboratory is operated by Triad National Security, LLC, for the National Nuclear Security Administration of US Department of Energy (Contract No. 89233218CNA000001). The isotope(s) used in this research was supplied by the US Department of Energy Isotope Program, managed by the Office of Isotope R&D and Production.

Funders	Funder number
U.S. Department of Energy
National Nuclear Security Administration
Los Alamos National Laboratory
Office of Isotope R and D and Production

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10.1103/PhysRevC.108.014608

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title = "Measurement of the neutron-induced capture-to-fission cross section ratio in U 233 at LANSCE",

abstract = "The neutron-induced capture-to-fission cross section ratio of U233 has been measured at the Los Alamos Neutron Science Center at Los Alamos National Laboratory in the energy range from 0.7 eV to 250 keV. The detector setup combines the Detector for Advanced Neutron Capture Experiments (DANCE) to measure γ rays generated from both capture and fission reactions, and the neutron detector array at DANCE to measure fission neutrons. This is the first measurement of the capture-to-fission ratio between 2 and 30 keV. The evaluations are in good agreement with the results in the resolved resonance region. In both the unresolved resonance region and the fast neutron region, a lower capture-to-fission ratio is obtained in this work from 10 to 150 keV compared to current evaluations, while good agreement with the experimental data and the evaluations is found above 150 keV. Statistical model calculations were performed to compare with the experimental data. Significantly reduced (Γγ) was required to reproduce the measured data.",

author = "E. Leal-Cidoncha and A. Couture and Bond, {E. M.} and Bredeweg, {T. A.} and C. Fry and T. Kawano and Lovell, {A. E.} and G. Rusev and I. Stetcu and Ullmann, {J. L.} and L. Leal and Pigni, {M. T.}",

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AU - Bredeweg, T. A.

AU - Fry, C.

AU - Kawano, T.

AU - Lovell, A. E.

AU - Rusev, G.

AU - Stetcu, I.

AU - Ullmann, J. L.

AU - Leal, L.

AU - Pigni, M. T.

N1 - Publisher Copyright: © 2023 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

PY - 2023/7

Y1 - 2023/7

N2 - The neutron-induced capture-to-fission cross section ratio of U233 has been measured at the Los Alamos Neutron Science Center at Los Alamos National Laboratory in the energy range from 0.7 eV to 250 keV. The detector setup combines the Detector for Advanced Neutron Capture Experiments (DANCE) to measure γ rays generated from both capture and fission reactions, and the neutron detector array at DANCE to measure fission neutrons. This is the first measurement of the capture-to-fission ratio between 2 and 30 keV. The evaluations are in good agreement with the results in the resolved resonance region. In both the unresolved resonance region and the fast neutron region, a lower capture-to-fission ratio is obtained in this work from 10 to 150 keV compared to current evaluations, while good agreement with the experimental data and the evaluations is found above 150 keV. Statistical model calculations were performed to compare with the experimental data. Significantly reduced (Γγ) was required to reproduce the measured data.

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Measurement of the neutron-induced capture-to-fission cross section ratio in U 233 at LANSCE

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