Measurement of the cross section of the Q=4.4398 MeV 12C (n, n'γ) reaction from threshold to 16.5 MeV using γ and correlated n–γ detection

Kelly, Keegan John; Devlin, Matthew James; O'Donnell, John M.; Bennett, Eames Alexander; Paris, Mark W.; Copp, Patrick Alexander

doi:10.1103/physrevc.108.014603

Measurement of the cross section of the Q=4.4398 MeV ¹²C (n, n'γ) reaction from threshold to 16.5 MeV using γ and correlated n–γ detection

Journal Article · Tue Jul 11 00:00:00 EDT 2023 · Physical Review. C

DOI:https://doi.org/10.1103/physrevc.108.014603· OSTI ID:1993240

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Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

The Q=4.4398 MeV ¹²C (n, n'γ) cross section was measured using a white incident neutron source through the detection of γ rays only and n–γ coincidences using a segmented liquid scintillator detector array. While the n–γ technique utilized here is more generally applicable to a wide variety of neutron scattering measurements, the γ-only technique was successfully applied to this reaction to exploit the precise time resolution and high efficiency of this detection system to yield results with unprecedented statistical precision and total uncertainties < 2 % from reaction threshold up to 16 MeV incident neutron energy, clearly resolving many features in this reaction that were previously not well known. The γ-only and n–γ results are consistent with each other for the majority of the incident energy range covered in this paper, thereby lending validation to the n–γ technique for future measurements, though significant disagreements are observed between both results and with the ENDF/B-VIII.0 nuclear data evaluation. These differences are particularly noticeable in the recently evaluated energy range below 6.5 MeV, and also near 14 MeV where a “sawtooth”-like feature is observed similar to that in other ¹²C+n reaction channels. Finally, both γ-only and n–γ results are presented here with thorough covariance derivations.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1993240

Report Number(s):: LA-UR-23-24861

Journal Information:: Physical Review. C, Journal Name: Physical Review. C Journal Issue: 1 Vol. 108; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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