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

摘要

While Li-11 is known to be a halo nucleus with two neutrons around a Li-9 core, 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 available 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 framework, A finite-range, momentutn, density and isospin dependent NN interaction (SBM) is folded with realistic densities of different nuclei. To fit the elastic angular distribution, the real part of the folded potentials are multiplied by a renormalization factor (NR) Except for the p + He-4 scattering at low incident energy, the N-R values are found to be significantly different from 1.0, indicating appreciable channel coupling effects in the energy 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 Science B.V. All rights reserved. [References: 47]