Neutron-Induced Reactions in Third and Fourth Shell Nuclei

A counter telescope and scintillation spectrometer were used to obtain spectra and angular distributions (0° to 150° at 30° intervals) of the ($n, p$) reactions at 14 Mev on the targets Mg, Al, Si, P, S, Ti, Fe, Co, Ni, and Zn. Contributions of ($n, d$) have been separated by two independent experimental methods, and direct interaction contributions by the criterion of angular asymmetry. The residual yield has been analyzed to give values of temperature (accuracy about 10%) and spin-dependence parameters (lower limits), which compare reasonably with independent values based on collected level information. Fractions of direct interaction are quite well described by the model of Brown and Muirhead, and total cross sections are consistent with available determinations by other methods. Angular distributions of strong ($n, d$) ground-state groups from P and S have the appropriate pickup forms.