With a simple parametrization of the empirical imaginary potential depths, the real potential induced by a dispersion relation is calculated analytically for the elastic scattering of O16 by several target nuclei. Between 25e50 % of the real potential empirical depths can be attributed to this dispersive contribution when the energy approaches the Coulomb barrier. Thus, the anomaly observed in the microscopically calculated real potential at these energies can be explained by taking into account the real part induced from the imaginary one through the dispersion relation.

Comisión Asesora de Investigación Científica y Técnica 2868-83