Large back-angle quasielastic scattering for $^{7}$Li+$^{159}$Tb

TL;DR

This study measures quasielastic scattering at large backward angles for the $^{7}$Li+$^{159}$Tb system near the Coulomb barrier, analyzing barrier distributions and comparing quasielastic and fusion data.

Contribution

It provides new experimental data on quasielastic scattering and barrier distributions for a weakly bound system, including the effects of alpha particle emission.

Findings

Barrier distribution centroid shifts higher when including alpha particles.

Quasielastic barrier distribution analyzed with coupled channel calculations.

Comparison made between quasielastic and fusion barrier distributions.

Abstract

Quasielastic scattering excitation function at large backward angle has been measured for the weakly bound system, $^{7}$Li+$^{159}$Tb at energies around the Coulomb barrier. The corresponding quasielastic barrier distribution has been derived from the excitation function, both including and excluding the $\alpha$-particles produced in the reaction. The centroid of the barrier distribution obtained after inclusion of $\alpha$-particles was found to be shifted higher in energy, compared to the distribution excluding the $\alpha $-particles. The quasielastic data, excluding the $\alpha$-particles, have been analyzed in the framework of continuum discretized coupled channel calculations. The quasielastic barrier distribution for $^{7}$Li+$^{159}$Tb, has also been compared with the fusion barrier distribution for the system.