(d,n) Reactions with 15-Mev Deuterons. Part I. Angular Distributions

Nine elements are bombarded with 15-Mev deuterons from a cyclotron. The resulting angular distributions of 9.25- to 13.1-Mev neutrons are measured by means of a four-proportional counter telescope and also by threshold detectors. It is observed that all the measured angular distributions are peaked in the forward direction, some showing a peak at 0° and others peaks at 10°-15° with respect to the deuteron beam. Different methods of production of neutrons from ($d,n$) reactions are discussed, and it is shown that most of the observed neutrons are produced by a stripping process.