The elastic angular distributions for ${}_{}{}^{58}{}_{}{}^{}\mathrm{Ni}$${+}^{27}$Al have been measured at five energies from ${\mathit{E}}_{\mathrm{c}.\mathrm{m}.\mathrm{}}$=48.8 to 69.5 MeV. The optical model analysis assumes both phenomenological and folding model potentials. Regions of sensitivity, where the potential is well determined, are found to be different for the real and the imaginary parts, and to vary with energy. The values of the real potential in the surface are weakly dependent on energy.

• Received 22 February 1993

DOI:https://doi.org/10.1103/PhysRevC.48.1147