Recoil Ranges of Products from Reactions ofCu65with 11-33-MeVHe3Ions

Average projected ranges have been determined for the (${\mathrm{He}}^3,n$), (${\mathrm{He}}^3,2n$), and (${\mathrm{He}}^3,\alpha$) reactions of ${\mathrm{Cu}}^{65}$ over the energy range of 11-35 MeV. The results have been compared with calculations based on the assumption of compound-nucleus formation. Excellent agreement is obtained for the (${\mathrm{He}}^3,2n$) reaction at all energies and for the (${\mathrm{He}}^3,n$) reaction up to 17 MeV. The ranges of ${\mathrm{Cu}}^{64}$ are much smaller than the theoretical values at all energies, indicating that the $({\mathrm{He}}^3,\alpha$) reaction involves a direct interaction.