Because optical-model potentials are relatively well determined by light-ion elastic scattering, we have compared such potentials with the proximity potential, which was developed for heavy-ion reactions. After the real, nuclear potentials determined by $p$, $d$, ${}_{}{}^3{}_{}{}^{}\mathrm{He}$, and $\alpha$ scattering at 30-35 MeV/amu are transformed into the universal proximity form they are rather similar to each other and are in rough agreement with a theoretical proximity potential.

• Received 11 August 1978

DOI:https://doi.org/10.1103/PhysRevLett.41.1285