The Indirect (p, d) Process

In 300-Mev proton bombardment of various targets highenergy deuterons have been observed ejected at large angles where direct pick-up deuterons were improbable. For these deuterons, the dependence of the cross section on the mass number of the target nucleus suggests an indirect pick-up process, induced by seoondary nucleons which are produced hy one or more collisions of the primary proton in the same nucleus. With some assumptions about the pick-up probability of the secondary nucleons, the indirect prooess hypothesis is shown to give results consistent with the experimental data on energy spectrum shape and angular dependence of the deuterons. In the present note a calculation is made of the effective pick-up probability considering the attenuation effects of produced deuterons. (A. C.)