Energy, angular and charge distributions for deeply inelastic scattering of Xe by Ta and Pb

Abstract

Energy spectra, angular distributions, and Z-distributions for the scattering of 1120 MeV 136Xe ions by 181Ta and 208Pb have been measured. The elastic scattering angular distributions are fitted by optical model potentials whose strength in the tail region of the potential is in good agreement with theoretical estimates. The angular distributions for non-elastic processes are sidewise peaked for both the quasi-elastic and deeply inelastic components. The sum of the integrated cross sections for these components accounts for all of the expected total reaction cross section, with no evidence for a significant fusion-fission component. For most angles the energy spectra exhibit a broad peak several hundred MeV below the elastic peak. At very forward and very backward angles the most probable total kinetic energy is sub-barrier with respect to the entrance channel. The Z-distributions of the light reaction product exhibit a most probable Z that is remarkably close to that of the projectile for all angles and energy losses. A linear dependence of the width of the Z-distribution on energy loss is found that is common to all angles.