Nonstatistical fluctuations in the Cl 35 (n,p) S 35 reaction cross section at fast-neutron energies from 0.6 to 6 MeV

S. A. Kuvin; H. Y. Lee; T. Kawano; B. Digiovine; A. Georgiadou; C. Vermeulen; M. White; L. Zavorka; H. I. Kim

doi:10.1103/PhysRevC.102.024623

Nonstatistical fluctuations in the Cl 35 (n,p) S 35 reaction cross section at fast-neutron energies from 0.6 to 6 MeV

S. A. Kuvin, H. Y. Lee, T. Kawano, B. Digiovine, A. Georgiadou, C. Vermeulen, M. White, L. Zavorka, H. I. Kim

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18 Scopus citations

Abstract

The lack of experimental data on the Cl35(n,p)S35 reaction above 100 keV has led to nuclear data evaluations that are relatively unconstrained at fast neutron energies. As a result, efforts to explore, develop, and potentially certify next generation reactor designs that incorporate chloride salts as a coolant material have been hindered. In this paper, we report partial cross section data for the Cl35(n,p)S35 and Cl35(n,α)P32 reactions at incident neutron energies between 0.6 MeV and 6 MeV. The measurement was performed using the pulsed beam of neutrons at the unmoderated WNR spallation neutron source at the Los Alamos Neutron Science Center, with the outgoing charged particles detected by the LENZ experimental setup, consisting of annular silicon detectors. Nonstatistical fluctuations in the Cl35(n,p0) cross section were observed up to around 3 MeV, and the magnitude of the cross section was systematically lower than all available data evaluations at energies above 1 MeV. Modifications to the ENDF/B-VIII.0 data evaluation are suggested to better reproduce the energy averaged experimental data.

Original language	English
Article number	024623
Journal	Physical Review C
Volume	102
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevC.102.024623
State	Published - Aug 2020
Externally published	Yes

Funding

This work benefits from the LANSCE accelerator facility and is supported by the US Department of Energy under Contract No. 89233218CNA000001 and by the Laboratory Directed Research and Development program of Los Alamos National Laboratory under Project no. 20180228ER. The author, S.A.K., would like to acknowledge the financial support from LANL through the Agnew National Security post-doctoral fund. The authors also acknowledge Matthew Devlin, of Los Alamos National Laboratory, who was instrumental in obtaining the target samples used in this study; Khchatur Manukyan, of Notre Dame, for performing the target fabrication; Hisato Yamaguchi, of Los Alamos National Laboratory, for SEM measurements of the Brass foil composition, and Partha Chowdhury, of UMassLowell, for discussions regarding the cross section needs for CLYC detectors that have been developed using funding from NNSA-SSAA grants.

Funders	Funder number
Agnew National Security
U.S. Department of Energy	89233218CNA000001
Laboratory Directed Research and Development
Los Alamos National Laboratory	20180228ER

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title = "Nonstatistical fluctuations in the Cl 35 (n,p) S 35 reaction cross section at fast-neutron energies from 0.6 to 6 MeV",

abstract = "The lack of experimental data on the Cl35(n,p)S35 reaction above 100 keV has led to nuclear data evaluations that are relatively unconstrained at fast neutron energies. As a result, efforts to explore, develop, and potentially certify next generation reactor designs that incorporate chloride salts as a coolant material have been hindered. In this paper, we report partial cross section data for the Cl35(n,p)S35 and Cl35(n,α)P32 reactions at incident neutron energies between 0.6 MeV and 6 MeV. The measurement was performed using the pulsed beam of neutrons at the unmoderated WNR spallation neutron source at the Los Alamos Neutron Science Center, with the outgoing charged particles detected by the LENZ experimental setup, consisting of annular silicon detectors. Nonstatistical fluctuations in the Cl35(n,p0) cross section were observed up to around 3 MeV, and the magnitude of the cross section was systematically lower than all available data evaluations at energies above 1 MeV. Modifications to the ENDF/B-VIII.0 data evaluation are suggested to better reproduce the energy averaged experimental data.",

author = "Kuvin, {S. A.} and Lee, {H. Y.} and T. Kawano and B. Digiovine and A. Georgiadou and C. Vermeulen and M. White and L. Zavorka and Kim, {H. I.}",

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AU - Kuvin, S. A.

AU - Lee, H. Y.

AU - Kawano, T.

AU - Digiovine, B.

AU - Georgiadou, A.

AU - Vermeulen, C.

AU - White, M.

AU - Zavorka, L.

AU - Kim, H. I.

PY - 2020/8

Y1 - 2020/8

N2 - The lack of experimental data on the Cl35(n,p)S35 reaction above 100 keV has led to nuclear data evaluations that are relatively unconstrained at fast neutron energies. As a result, efforts to explore, develop, and potentially certify next generation reactor designs that incorporate chloride salts as a coolant material have been hindered. In this paper, we report partial cross section data for the Cl35(n,p)S35 and Cl35(n,α)P32 reactions at incident neutron energies between 0.6 MeV and 6 MeV. The measurement was performed using the pulsed beam of neutrons at the unmoderated WNR spallation neutron source at the Los Alamos Neutron Science Center, with the outgoing charged particles detected by the LENZ experimental setup, consisting of annular silicon detectors. Nonstatistical fluctuations in the Cl35(n,p0) cross section were observed up to around 3 MeV, and the magnitude of the cross section was systematically lower than all available data evaluations at energies above 1 MeV. Modifications to the ENDF/B-VIII.0 data evaluation are suggested to better reproduce the energy averaged experimental data.

AB - The lack of experimental data on the Cl35(n,p)S35 reaction above 100 keV has led to nuclear data evaluations that are relatively unconstrained at fast neutron energies. As a result, efforts to explore, develop, and potentially certify next generation reactor designs that incorporate chloride salts as a coolant material have been hindered. In this paper, we report partial cross section data for the Cl35(n,p)S35 and Cl35(n,α)P32 reactions at incident neutron energies between 0.6 MeV and 6 MeV. The measurement was performed using the pulsed beam of neutrons at the unmoderated WNR spallation neutron source at the Los Alamos Neutron Science Center, with the outgoing charged particles detected by the LENZ experimental setup, consisting of annular silicon detectors. Nonstatistical fluctuations in the Cl35(n,p0) cross section were observed up to around 3 MeV, and the magnitude of the cross section was systematically lower than all available data evaluations at energies above 1 MeV. Modifications to the ENDF/B-VIII.0 data evaluation are suggested to better reproduce the energy averaged experimental data.

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Nonstatistical fluctuations in the Cl 35 (n,p) S 35 reaction cross section at fast-neutron energies from 0.6 to 6 MeV

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