Energy dependence of the optical potential of the weakly bound 9Be projectile on the 197Au target

In this work we measured elastic and inelastic angular distributions of the weakly bound Be-9 projectile on the Au-197 target at several bombarding energies from 84% up to 140% of the Coulomb barrier. The elastic angular distributions were analyzed using a phenomenological Woods-Saxon potential and a double folding Sao Paulo potential and the energy dependence was extracted. Angular distributions from two inelastic peaks were compared with coupled channel calculations using reduced transition probabilities available in the literature. The energy dependence of the two interaction potential models show a similar trend in the region of the Coulomb barrier. Dispersion relation calculation demonstrates the presence of the breakup threshold anomaly proposed for weakly bound systems. (C) 2020 Elsevier B.V. All rights reserved.