Microscopic analysis of projectile excitation for 18O+64Ni.

Abstract

A microscopic analysis of the inelastic scattering of $^{18}\mathrm{O}$ from $^{64}\mathrm{Ni}$ is presented. The real transition potential for the excitation of the first ${2}^{+}$ state in $^{18}\mathrm{O}$ for $^{18}\mathrm{O}$ is calculated from the double folding model using proton and neutron transition densities determined from new medium energy electron and proton scattering data. The longer radial tail of the real transition potential obtained using this neutron transition density describes correctly the amplitude of oscillations in the Coulomb-nuclear interference region of the ${2}^{+}$ cross section. Unfortunately, coupled channels calculations, employing real double folded and imaginary Woods-Saxon interaction potentials and including reorientation of the $^{18}\mathrm{O}$ ${2}^{+}$ state, still fail to reproduce the phase of the Coulomb-nuclear interference pattern observed in the data. The imaginary part of the interaction potential, as the only phenomenological term remaining in the analysis, is suggested to be responsible for this defect.