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Chinese Physics C > 2026, Vol. 50 > Issue(3): 034004 DOI: 10.1088/1674-1137/ae1cb1

Measurement of the differential and total cross-sections ofγ-ray emission induced by 14.1 MeV neutrons for C, Al, Si, Ca, Ti, Cr, and Fe using the tagged neutron method

  • 1.

    Joint Institute for Nuclear Research (JINR), Dubna, Russia

  • 2.

    Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, Sofia, Bulgaria

  • 3.

    Faculty of Physics, Lomonosov Moscow State University, Moscow, Russia

  • 4.

    Skobeltsyn Institute of Nuclear Physics, Moscow State University, Moscow, Russia

  • 5.

    Moscow Institute of Physics and Technology, Moscow, Russia

  • In this work, differential cross sections of $ \gamma $-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 $ \gamma $-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 LaBr 3(Ce) scintillation detectors positioned at angles of 25°, 45°, 60°, and 70° relative to the generator target – sample center axis. A neutron generator that can produce 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, $ \gamma $-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 $ \gamma $-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 9.1%.
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  • References

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