Energy dependence of /sup 4/He(p,d)/sup 3/He

The cross section of /sup 4/He(p,d)/sup 3/He at theta = 22.5 has been measured between T/sub p/ = 200 and 500 MeV, which together with previous data provides the first excitation function for the (p,d) reaction up to T/sub p/ = 770 MeV and 0.7 GeV/c momentum transfer. The energy variation is found mainly to reflect a strong dependence upon momentum transfer. Using known nuclear wave functions we examine the contributions from ordinary neutron pickup and certain multinucleon reaction mechanisms.