JDependence in the (He3,α) Reaction

The reactions ${\mathrm{Fe}}^{56}({\mathrm{He}}^3,\alpha ){\mathrm{Fe}}^{55}$ and ${\mathrm{Ni}}^{60}({\mathrm{He}}^3,\alpha ){\mathrm{Ni}}^{59}$ have been studied with particular attention to the dependence of the angular distribution on the total angular-momentum transfer. Distinct differences in phase were observed in the angular distributions corresponding to $l=3\mathrm{}$ neutron pickup to states of different spins. Less pronounced differences were observed for $l=1\mathrm{}$ transitions. All angular distributions showed oscillations about an exponential decrease in cross section with increasing angle. This lack of distinct character in the angular distributions may limit the usefulness of the (${\mathrm{He}}^3,\alpha$) reaction as a spectroscopic tool.