Abstract
Gamma-ray production cross sections have been measured for Al, Si, Fe, Ni, Cu, Pb and Bi at incident neutron energies from 7.8 to 13.0 MeV using monoenergetic neutron sources. Neutrons were produced at the JAERI Tandem accelerator by the 2H(d,n)3He reaction for 7.8 and 10.0 MeV and 1H(11B,n)11C reaction for 11.5 and 13.0 MeV. Emitted gamma-rays were measured with a 7.6 cm dia. x 15.2 cm long NaI(Tl) detector surrounded by a 25.4 cm dia. x 25.4 cm long annular NaI(Tl) detector operated in an anti-coincidence mode. Time-of-flight technique was used to reduce backgrounds. To obtain gamma-ray energy spectra, measured pulse height data were unfolded by the FERDOR code. Several correction factors were calculated by the Monte Carlo method such as angular distribution of source neutrons, neutron multiple scattering, outgoing gamma-ray attenuation and Compton scattering in the sample. Differential cross sections are given as a function of gamma-ray energy over the region from 0.7 to 12 MeV. Discrete gamma-ray and total gamma-ray production cross sections are also presented.
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