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

TL;DR

This study investigates how the optical potential of weakly bound 9Be projectiles on 197Au targets varies with energy, revealing a breakup threshold anomaly consistent with weakly bound nuclear systems.

Contribution

It provides the first detailed analysis of the energy dependence of optical potentials for 9Be on gold, including dispersion relation insights and comparison of phenomenological and folding models.

Findings

Energy dependence shows similar trends in different potential models.

Dispersion relation indicates a breakup threshold anomaly.

Elastic and inelastic scattering data support the weakly bound nature.

Abstract

In this work we measured elastic and inelastic angular distributions of the weakly bound 9Be projectile on the 197Au 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.