POTENTIAL INTERACTION AND TRANSFER IN ELASTIC LI-7(LI-6,LI-6)LI-7 ANDINELASTIC LI-7(LI-6,LI-6)LI-7(0.48) SCATTERING AT E-LAB=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 potenti al scattering as well as one-step and two-step transfer processes whic h were treated in DWBA. Potential scattering was found to dominate at forward scattering angles, single-step neutron transfer to be most inf luential at backward scattering angles while two-step transfer of nucl eons including excited intermediate states modify the cross sections i n 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 absorp tion potentials reproduce potential scattering very well while transfe r processes are only described satisfactorily by volume absorbing pote ntials especially at lab energies above 20 MeV. (C) 1995 Elsevier Scie nce B.V.