Double-differential gamma-ray production cross sections of Al, Fe and Si for neutrons between 8.5 and 14.2 MeV

Gamma ray production cross sections have been measured for neutron energies of 8.5, 10.0, 12.2 and 14.2 MeV at 35deg, 55deg, 75deg and 90deg for gamma ray energies up to 5 MeV. Similar to experiments with pulsed white neutron sources the time-of-flight method was applied to select the monoenergetic portion of the 3H(p, n)3He neutron source spectrum so that data in the 'gap' region could be measured. To make up for the reduced intensity a highly efficient NaI-detector was used. It was placed into an annulus detector to reduce the Compton contribution to the spectra by an anticoincidence condition. A measurement with a threefold smaller sample taken under otherwise identical conditions was used to check the computer codes correcting for neutron and gamma-ray interactions in the sample. This resulted in substantial improvements of these codes allowing the extraction of gamma-ray continua in the spectra. (orig.)