(p, n) Cross Sections of Copper and Zinc

The ($p, n$) reaction cross sections of ${\mathrm{Cu}}^{63}$, ${\mathrm{Cu}}^{65}$, ${\mathrm{Zn}}^{64}$, ${\mathrm{Zn}}^{66}$, and ${\mathrm{Zn}}^{68}$ were measured at energies up to 12 Mev. The energy dependence agrees with that predicted by the Shapiro calculations, but the large variation of cross section among these nuclides suggests that interactions, other than compound nucleus formation, are taking place at these energies. The threshold of the reaction ${\mathrm{Zn}}^{64}(p, n){\mathrm{Ga}}^{64}$ was determined, giving $Q=-7.8\mathrm{}\pm 0.15$ Mev.