HALO STRUCTURE OF LI-11 IN PROTON SCATTERING - A FOLDING MODEL DESCRIPTION WITH ISOSPIN, DENSITY AND MOMENTUM DEPENDENT EFFECTIVE INTERACTION

摘要

Recent Li-11+p elastic scattering data at 62, 68.4, and 75 MeV and inelastic scattering data at 68.4 MeV, taken at RIKEN, are analysed with an isospin, density and momentum dependent finite range effective interaction (SBM) and M3Y interaction in a single folding model. The M3Y folded Li-11+p potentials are found to be almost similar to the folded Li-9+p potentials. But the SBM folded Li-11+p potentials are distinctly different, causing small but significant change in the angular distribution. Folded potentials need appreciable reduction factors indicating possible effects of strong breakup channel coupling. No significant change in results is found if Li-9 core + Gaussian two-neutron halo density is used instead of the COSM density of Li-11 although the radial extent of the latter is much larger. The angular distribution of the recently discovered excited state at 1.3 MeV, well reproduced by the SBM folded potential, is found to be predominantly dipole in nature. (C) 1997 Elsevier Science B.V. [References: 31]