Coupled-channel effects in elastic scattering and near-barrier fusion induced by weakly bound nuclei and exotic halo nuclei

The influence on fusion of coupling to the breakup process is investigated for reactions where at least one of the colliding nuclei has a sufficiently low binding energy for breakup to become an important process. Elastic scattering, excitation functions for sub- and near-barrier fusion cross sections, and breakup yields are analyzed for Li6,7+Co59. Continuum-discretized coupled-channels (CDCC) calculations describe well the data at and above the barrier. Elastic scattering with Li6 (as compared to Li7) indicates the significant role of breakup for weakly bound projectiles. A study of He4,6 induced fusion reactions with a three-body CDCC method for the He6 halo nucleus is presented. The relative importance of breakup and bound-state structure effects on total fusion is discussed.