Projectile structure effects in the collisions 6,7Li+64Zn around the Coulomb barrier.

Abstract

We measured elastic scattering angular distributions and cross sections for heavy residue production for the systems 6,7Li+64Zn at different energies around the Coulomb barrier. The elastic scattering angular distributions have been reproduced by optical model fits using a renormalized double folding potential for the real and imaginary parts. Absence of usual threshold anomaly in the optical potential was found. The excitation functions for heavy residue production were measured using an activation technique. Comparison with different calculations suggest that complete fusion is the dominant reaction mechanism above the barrier whereas, below the Coulomb barrier, incomplete fusion and transfer dominate.