Measurements of (n,xp),(n,xd) double differential cross sections of carbonand aluminum for 65 and 75 MeV neutrons

Double differential (n, xp), (n, xd) cross sections of carbon and aluminum were measured for 65 and 75 MeV neutrons at angles between 12 degrees and 7 0 degrees using Delta E-E telescopes at a Li-7(p, n) neutron source facilit y at TIARA. The data at 12 degrees were obtained by employing an annular ge ometry. The telescopes consisting of SSD and NaI(Tl) scintillator, experime ntal methods and the data reduction procedures are presented as well as the results. The carbon data are compared favorably with existing experimental data. The (n, xp) spectra of both carbon and aluminum agreed fairly well w ith theoretical calculations based on the intra-nuclear cascade model and t he multi-step Hauser-Feshbach model including preequilibrium effects, but t he (n, xd) spectra differ significantly from those calculations.