Abstract
Angular distributions of 7Li( 6Li, 6Li) 7Li and 7Li( 6Li, 6Li) 7Li 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 of angles, especially at the highest energies studied. Global optical model potentials found earlier for symmetrical LiLi 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.
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