Differential cross sections of the O 16 (n,α) reaction at neutron energies from 3.8 to 15 MeV

H. Y. Lee; S. A. Kuvin; L. Zavorka; S. Mosby; B. Digiovine; G. Hale; M. Paris; D. Votaw; M. White

doi:10.1103/PhysRevC.109.014601

Differential cross sections of the O 16 (n,α) reaction at neutron energies from 3.8 to 15 MeV

H. Y. Lee, S. A. Kuvin, L. Zavorka, S. Mosby, B. Digiovine, G. Hale, M. Paris, D. Votaw, M. White

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2 Scopus citations

Abstract

The importance of studying the O16(n,α) reaction is motivated by multiple nuclear applications which rely on an accurate nuclear reaction data library for oxygen. Discrepancies between past experimental data on the O16(n,α)C13 reaction and its time-reverse C13(α,n)O16 reaction have led to various different nuclear data evaluations. We have measured O16(n,α) reaction cross sections using the LENZ instrument with the unmoderated white neutron source at LANSCE. Results from 2016/2017 data are discussed and used to benchmark the mcnp and geant simulations of the LENZ experimental setup. We report partial differential cross sections of O16(n,α0) at En=3.8-15 MeV and O16(n,α1+α2+α3) at En=9-15 MeV, based on the new measurement in 2021. The resonances that we observed are in good agreement with the levels in O17 that were previously measured. The LENZ cross sections are in better agreement with the ENDF/B-VIII.0 evaluation than the with reduced cross section found in ENDF/B-VII.1 up to 6 MeV. However, the current results for O16(n,α0)Cg.s.13 appear to be in the best agreement over the entire energy range with that of JENDL/AN-2005 (ENDF/B-VI.0).

Original language	English
Article number	014601
Journal	Physical Review C
Volume	109
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevC.109.014601
State	Published - Jan 2024
Externally published	Yes

Funding

This work benefits from the LANSCE accelerator facility and is supported by the U.S. 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 U.S. Department of Energy (Contract No. 89233218CNA000001). H.Y.L. acknowledges support from the Laboratory Directed Research and Development program of Los Alamos National Laboratory under Project No. 20130758ECR. We would like to thank Dr. J. Görres and Dr. E. Stech of the University of Notre Dame for providing great support on target characterization measurements at Notre Dame.

Funders	Funder number
U.S. Department of Energy
National Nuclear Security Administration	89233218CNA000001
Laboratory Directed Research and Development	20130758ECR
Los Alamos National Laboratory

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10.1103/PhysRevC.109.014601

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title = "Differential cross sections of the O 16 (n,α) reaction at neutron energies from 3.8 to 15 MeV",

abstract = "The importance of studying the O16(n,α) reaction is motivated by multiple nuclear applications which rely on an accurate nuclear reaction data library for oxygen. Discrepancies between past experimental data on the O16(n,α)C13 reaction and its time-reverse C13(α,n)O16 reaction have led to various different nuclear data evaluations. We have measured O16(n,α) reaction cross sections using the LENZ instrument with the unmoderated white neutron source at LANSCE. Results from 2016/2017 data are discussed and used to benchmark the mcnp and geant simulations of the LENZ experimental setup. We report partial differential cross sections of O16(n,α0) at En=3.8-15 MeV and O16(n,α1+α2+α3) at En=9-15 MeV, based on the new measurement in 2021. The resonances that we observed are in good agreement with the levels in O17 that were previously measured. The LENZ cross sections are in better agreement with the ENDF/B-VIII.0 evaluation than the with reduced cross section found in ENDF/B-VII.1 up to 6 MeV. However, the current results for O16(n,α0)Cg.s.13 appear to be in the best agreement over the entire energy range with that of JENDL/AN-2005 (ENDF/B-VI.0).",

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AU - Lee, H. Y.

AU - Kuvin, S. A.

AU - Zavorka, L.

AU - Mosby, S.

AU - Digiovine, B.

AU - Hale, G.

AU - Paris, M.

AU - Votaw, D.

AU - White, M.

PY - 2024/1

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AB - The importance of studying the O16(n,α) reaction is motivated by multiple nuclear applications which rely on an accurate nuclear reaction data library for oxygen. Discrepancies between past experimental data on the O16(n,α)C13 reaction and its time-reverse C13(α,n)O16 reaction have led to various different nuclear data evaluations. We have measured O16(n,α) reaction cross sections using the LENZ instrument with the unmoderated white neutron source at LANSCE. Results from 2016/2017 data are discussed and used to benchmark the mcnp and geant simulations of the LENZ experimental setup. We report partial differential cross sections of O16(n,α0) at En=3.8-15 MeV and O16(n,α1+α2+α3) at En=9-15 MeV, based on the new measurement in 2021. The resonances that we observed are in good agreement with the levels in O17 that were previously measured. The LENZ cross sections are in better agreement with the ENDF/B-VIII.0 evaluation than the with reduced cross section found in ENDF/B-VII.1 up to 6 MeV. However, the current results for O16(n,α0)Cg.s.13 appear to be in the best agreement over the entire energy range with that of JENDL/AN-2005 (ENDF/B-VI.0).

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Differential cross sections of the O 16 (n,α) reaction at neutron energies from 3.8 to 15 MeV

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