Direct-reaction mechanisms in the α(p,d)3He reaction

In this investigation, we have made a PWBA study of the α(p,d)3He reaction. The result shows that, at relatively high energies, the cross section behaviour at forward angles can be explained as arising from a one nucleon pickup process, while that at backward angles can be explained as arising from a two-nucleon pickup process. In addition, it is found that, for an approximate description of these pickup processes, one needs only to consider the interaction between the incident nucleon and the nucleons removed from the target. This is an important finding, because if it should turn out to be generally true, then antisymmetrized direct-reaction calculations can be simplified to a considerable extent