Study of the Influence of Projectile Breakup on the Fusion Cross Section of6,7Li +12C,59Co

Abstract

Excitation functions for sub- and near-barrier total (complete + incomplete) fusion cross sections were studied for the 6 , 7 Li+ 5 9 Co reactions using standard γ-ray techniques and the results indicate a small enhancement of total fusion cross section at sub-barrier energies for the more weakly bound 6 Li projectile, with similar cross sections for both reactions at and above the barrier. In order to better understand the breakup contribution to fusion, we perfomed light particle coincidence measurements for the systems 6 , 7 Li+ 1 2 C, 5 9 Co at energies near and above the barrier. A three body kinematics analysis is performed with the objective of separating the contributions of different reaction mechanisms. For small angular differences between the light particles, the sequential and direct breakup seem to dominate. On the other hand, for large detector separations, a sequential decay following transfer is likely to dominate.