(p, n) reaction for89≤A≤130and an anomalous optical model potential for sub-Coulomb protons

The recently suggested $A$ dependence of the sub-Coulomb proton optical model potential in the mass region $89\le A\le 130$ is here discussed. Optical model parameters are deduced for ${}_{}{}^{89}{}_{}{}^{}\mathrm{Y}$, ${}_{}{}^{93}{}_{}{}^{}\mathrm{Nb}$, and ${}_{}{}^{103}{}_{}{}^{}\mathrm{Rh}$ from neutron and proton scattering data. Comparisons are made with previous analyses of proton strength functions.