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C 12 ( n , n 1 γ ) partial γ -ray cross section measured using the GENESIS array

Journal Article · · Physical Review. C
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Improved neutron inelastic scattering cross sections have repeatedly been identified as a top priority nuclear data need, important for basic science and a range of applications in nuclear energy, stockpile stewardship, and proliferation detection. For the C 12 ( n , n γ ) reaction in particular, recent measurements have unveiled some structural discrepancies, demonstrating incongruities among themselves and in relation to the ENDF/B-VIII.0 nuclear data evaluation. To help resolve these disagreements, a measurement was performed at the 88-Inch Cyclotron at Lawrence Berkeley National Laboratory using a broad-spectrum neutron beam and a 99.8% pure natural carbon target. The Gamma Energy Neutron Energy Spectrometer for Inelastic Scattering (GENESIS) was employed to measure energy-differential γ -ray emission spectra as a function of incident neutron energy in the energy range of 5.5 to 16.7 MeV. The C 12 partial γ -ray cross sections were extracted at 63 ,   122 . 5 , and 150 with respect to the incoming neutron beam and integrated using angular distribution data available in the literature. The data show agreement with a recent literature measurement and evaluation from 11 to 15 MeV, but indicate a larger cross section for incident neutron energies between 5.5 and 8.5 MeV. The measured relative angular distributions are also reported and were found to agree with evaluation.

Published by the American Physical Society 2025
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-05CH11231; NA0003180; NA0003996; AC52-07NA27344
OSTI ID:
2559031
Alternate ID(s):
OSTI ID: 2585366
OSTI ID: 2570727
Journal Information:
Physical Review. C, Journal Name: Physical Review. C Journal Issue: 4 Vol. 111; ISSN PRVCAN; ISSN 2469-9985
Publisher:
American Physical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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