O16,18elastic scattering fromNi58

The elastic scattering of ${}_{}{}^{18}{}_{}{}^{}\mathrm{O}$+${}_{}{}^{58}{}_{}{}^{}\mathrm{Ni}$ at 63.4 MeV and ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$+${}_{}{}^{58}{}_{}{}^{}\mathrm{Ni}$ at 63, 71.5, and 81 MeV has been studied and optical model fits have been obtained. The data indicate that weakly absorbing optical potentials of the type used in some recent distorted wave Born approximation calculations are inconsistent with back angle elastic scattering. A five-parameter surface transparent optical potential with $a_I<a_R$ has been found which reproduces the elastic scattering over this energy range and appears to be capable of qualitatively reproducing the observed forward peaked and oscillatory transfer reaction angular distributions in this mass region.