Correlated $\ n-γ$ angular distributions from the $\ Q$ = 4.4398 MeV 12C ($\ n, n' γ$) reaction for incident neutron energies from 6.5 MeV to 16.5 MeV

Kelly, K. J.; Devlin, M.; O'Donnell, J. M.; Bennett, E. A.

doi:10.1103/physrevc.104.064614

Correlated $$\ n-γ$$ angular distributions from the $$\ Q$$ = 4.4398 MeV ¹²C ($$\ n, n' γ$$) reaction for incident neutron energies from 6.5 MeV to 16.5 MeV

Journal Article · Thu Dec 23 04:00:00 EST 2021 · Physical Review. C

DOI:https://doi.org/10.1103/physrevc.104.064614· OSTI ID:1992251

^[1]; ^[1]; O'Donnell, J. M. ^[1]; ^[1]

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

Neutron scattering cross sections and angular distributions represent one of the most glaring sources of uncertainty in calculations of nuclear systems. Even simple nuclei like ¹²C show indications of errors in nuclear databases for scattering reactions. Measurements of inelastic neutron scattering have historically measured either the scattered neutrons or the nuclear deexcitation $$\ γ$$ emission. Only a very small number of experiments attempted correlated measurements of both the neutron and $$\ γ$$ data simultaneously, even though these $$\ n-γ$$ correlations could be essential for understanding particle transport in nuclear systems. In this work we describe a measurement of the $$\ n, γ$$, and correlated $$\ n-γ$$ angular distributions from the $$\ Q$$ = 4.4398 MeV ¹²C ($$\ n, n'γ$$) reaction in a single experiment using an EJ-309 liquid scintillator detector array with wide angular coverage, and with a continuous incident neutron energy range from 6.5 to 16.5 MeV. We also provide a thorough covariance description of these results, including normalization of the probability distribution. While the measured n distributions agree well with the relatively large number of available literature measurements, there are comparatively very few measurements of the γ distributions from this reaction. However, our data support the presence of a nonzero α₄ Legendre polynomial component of the γ angular distribution suggested in past measurements, which is currently not incorporated in the ENDF/B-VIII.0 library despite the use of these same literature data for evaluation of the ¹²C ($$\ n, n'γ$$) cross section. The correlated $$\ n-γ$$ distribution measurements are limited to three measurements at incident neutron energies near 14 MeV. Our results do not generally agree with any of these literature measurements. We observe clear indications of significant changes in the $$\ n$$ distribution for specific $$\ γ$$-detection angles and vice versa especially near thresholds for other reaction channels, which shows the potential for significant bias in experiments that, for example, tag on inelastic scattering using a single or small number of $$\ γ$$ -detection angles and could impact particle transport calculations.

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:: 1992251

Report Number(s):: LA-UR-21-21204

Journal Information:: Physical Review. C, Journal Name: Physical Review. C Journal Issue: 6 Vol. 104; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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