Consistent analysis of proton elastic scattering from He-4,He-6,He-8 and Li-6,Li-7,Li-9,Li-11 in the energy range of 25-75 A MeV

While Li-11 is known to be a halo nucleus with two neutrons around a Li-9 c ore, the neutrons in He-6 are predicted to form a skin around its He-4 core . Both nuclei have very low breakup thresholds. To understand the structure and reaction dynamics of those nuclei, a consistent analysis of the availa ble low energy (25-75 A MeV) proton elastic scattering data on He-4,He-6,He -8 and Li-6,Li-7,Li-9,Li-11 nuclei is carried out in a folding model framew ork, A finite-range, momentutn, density and isospin dependent NN interactio n (SBM) is folded with realistic densities of different nuclei. To fit the elastic angular distribution, the real part of the folded potentials are mu ltiplied by a renormalization factor (NR) Except for the p + He-4 scatterin g at low incident energy, the N-R values are found to be significantly diff erent from 1.0, indicating appreciable channel coupling effects in the ener gy region considered. Variation of Na values with incident energies for He- 6 and Li-11 is much smaller compared to He-8 and Li-6. (C) 2000 Elsevier Sc ience B.V. All rights reserved.