  Thirty elastic scattering angular distributions for seven heavy-ion systems,
in wide energy ranges, have been studied with the aim of systematizing the
optical potential, real and imaginary parts, in a global way. The framework is:
i) an extensive systematization of nuclear densities, ii) the energy dependence
of the bare potential accounted by a model based on the nonlocal nature of the
interaction, and iii) the real and imaginary parts of the optical potential
assumed to have the same radial shape.
