Study of the Nuclear ReactionsSc45(p, n)Ti45,Cu63(p, n)Zn63,Cu65(p, n)Zn65, andZn(p, n)Ga

The counter ratio method has been applied to the ($p, n$) reactions for ${\mathrm{Sc}}^{45}$, ${\mathrm{Cu}}^{63}$, ${\mathrm{Cu}}^{65}$, and Zn to determine the $Q$-values for the ground-state thresholds and to locate low-lying states in the residual nuclei. The thresholds for the ($p, n$) reactions were found to be 2.908 Mev for ${\mathrm{Sc}}^{45}$, 4.215 Mev for ${\mathrm{Cu}}^{63}$, 2.169 Mev for ${\mathrm{Cu}}^{65}$, and 3.749 Mev for ${\mathrm{Zn}}^{68}$. Other neutron thresholds were found corresponding to excited states in ${\mathrm{Ti}}^{45}$ at 0.743, 1.194, 1.347, 1.460, 1.876, 2.016, 2.430, and 2.555 Mev; in ${\mathrm{Zn}}^{63}$ at 0.191, 0.642, and 1.043 Mev; and in ${\mathrm{Zn}}^{65}$ at 0.78, 1.26, and 1.93 Mev. A threshold was found in the $\mathrm{Zn}(p, n)\mathrm{Ga}$ reaction which is probably due to a level in ${\mathrm{Ga}}^{68}$ at 0.170 Mev. Cross sections for the yield of neutrons in the forward direction were determined. The yields of neutrons from thin ${\mathrm{Sc}}^{45}$ and ${\mathrm{Cu}}^{63}$ targets were obtained for the proton energy region from the thresholds to 70 kev above these thresholds. McKibben nomographs are given for these two reactions.