On the role of nuclear surface in formation of total cross section in heavy ion reaction

The Glauber-Sitenko approach is developed for calculation of the nucleus-nucleus cross sections at intermediate energies on the basis of the analytic expression of the eikonal phase for the symmetrized Woods-Saxon potential. Calculations show that the differential elastic and total reaction cross sections occurs in a good agreement with those obtained by numerical solution of the wave equation. For the total reaction cross section, an instructive model of the phase is suggested that allows one to separate contributions from internal and peripheral regions of interaction. An important role of the surface is established in formation of the total cross section, and effects of the Coulomb field are studied, too. The nature of the continuous ambiguity of optical potentials is ascertained for interpreting total cross sections