Potential interaction and transfer in elastic 7Li(6Li,6Li)7Li and inelastic 7Li(6Li,6Li)7Li0.48 scattering at Elab=9-40 MeV

Angular distributions of Li-7(Li-6,Li-6)Li-7 and Li-7(Li-6,Li-6)Li-7(0.48) were measured for the first time in the energy range E-lab = 9-40 MeV. A theoretical analysis was performed taking into account potential scattering as well as one-step and two-step transfer processes which were treated in DWBA. Potential scattering was found to dominate at forward scattering angles, single-step neutron transfer to be most influential at backward scattering angles while two-step transfer of nucleons including excited intermediate states modify the cross sections in the full range nf angles, especially at the highest energies studied. Global optical model potentials found earlier for symmetrical Li-Li systems were applied to the analysis; surface as well as volume absorption potentials reproduce potential scattering very well while transfer processes are only described satisfactorily by volume absorbing potentials especially at lab energies above 20 MeV. (C) 1995 Elsevier Science B.V.