Measurement of the cross section of the MeV reaction from threshold to 16.5 MeV using and correlated detection

KJ Kelly, M Devlin, JM O'Donnell, EA Bennett, M Paris… - Physical Review C, 2023 - APS
KJ Kelly, M Devlin, JM O'Donnell, EA Bennett, M Paris, PA Copp
Physical Review C, 2023APS
The Q= 4.4398 MeV C 12 (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 …
The MeV cross section was measured using a white incident neutron source through the detection of rays only and coincidences using a segmented liquid scintillator detector array. While the technique utilized here is more generally applicable to a wide variety of neutron scattering measurements, the -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 from reaction threshold up to 16 MeV incident neutron energy, clearly resolving many features in this reaction that were previously not well known. The -only and results are consistent with each other for the majority of the incident energy range covered in this paper, thereby lending validation to the 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 reaction channels. Both -only and results are presented here with thorough covariance derivations.
American Physical Society
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