FOLDING ANALYSIS OF THE ELASTIC LI-6+C-12 SCATTERING - KNOCK-ON EXCHANGE EFFECTS, ENERGY-DEPENDENCE, AND DYNAMICAL POLARIZATION POTENTIAL

Versions of the M3Y effective nucleon-nucleon interaction, with different prescriptions for the knock-on exchange contributions and density dependence, have been used in a study of the energy dependence of the nucleon optical potential in nuclear matter as well as in a systematic folding model analysis of the elastic Li6+12C scattering data at Elab=60318 MeV to study the energy dependence of the Li6+12C optical potential. Contributions from the (breakup) dynamical polarization potential to the real part of the Li6+12C optical potential are simulated by a surface correction using splines added to the real folded potential. This is shown to be strongest at Elab=99 MeV. The correction needed to fit the data is found to be qualitatively similar to that predicted theoretically for breakup of the Li6. The optical model analysis of the refractive Li6+12C scattering data, using different types of real folded potential, shows that the most successful is the folded potential built upon density-dependent interactions, which have parameters chosen to reproduce the saturation properties of nuclear matter and which predict a nuclear incompressibility K around 200 MeV. © 1995 The American Physical Society.