Measurements of keV-neutron capture gamma rays from some structural and shielding materials

We have measured capture gamma rays from the structural and shielding materials, Mg, Al, Si, Ca, Cr, Co and Zr, with an anti-Compton NaI(Tl) detector, at several neutron energies between 10 and 600 keV, employing a time-of-flight technique. Observed pulse-height spectra were unfolded using a response matrix of the detector in order to obtain capture gamma-ray spectra. Those spectra from Al, Si, Ca and Cr were compared with statistical model calculations. In general the calculations reproduce fairly well the observed spectra at neutron energies of several hundreds keV. (orig.)