2025/08/27 by Prusachenko, P. S., Grozdanov, D. N., Fedorov, N. A. +10
#FOS: Physical sciences #Nuclear Experiment (nucl-ex) #Nuclear Theory (nucl-th)
paper · doi:10.48550/arxiv.2508.19925
In this work, differential cross sections of γ-ray emission produced in nuclear reactions induced by 14.1~MeV neutrons are measured for the 4.439~MeV line from carbon, as well as for 10 individual γ-ray lines from aluminum, 6 from silicon, 8 from calcium, 16 from titanium, 6 from chromium, and 14 from iron. The measurements were conducted using the tagged neutron method with four LaBr3(Ce) scintillation detectors positioned at angles of 25∘, 45∘, 60∘, and 70∘ relative to the generator target -- sample center axis. A neutron generator capable of producing 16 separate beams of tagged neutrons was employed, which, combined with the detector system, enabled the determination of differential cross-sections for 64 distinct angle values in the range of 17∘ to 89∘. To simplify data visualization, the angular distributions were divided into 5∘ intervals, with weighted mean values of the angle and differential cross-section calculated for each interval. Corrections for multiple neutron scattering and attenuation, γ-ray attenuation, and total detection efficiency, computed using GEANT4, were accounted for in the cross-section calculations. Additional measurements were performed to validate the correction calculations. The total γ-ray emission cross-sections were obtained by approximating the angular distributions with even-order Legendre polynomial expansions up to the 6th degree, followed by integration over the full solid angle. The total systematic error for the obtained data was estimated as 9 %.