Complete Fusion Enhancement and Suppression of Weakly Bound Nuclei at Near Barrier Energies

TL;DR

This paper investigates how breakup channels affect the complete fusion of weakly bound nuclei near barrier energies, highlighting enhancement and suppression phenomena through dynamic polarization potentials and experimental data analysis.

Contribution

It introduces a dynamic polarization potential framework to analyze fusion cross sections, emphasizing the role of nucleon transfer over direct breakup in fusion enhancement.

Findings

Sub-barrier fusion cross section enhancement observed.

Nucleon transfer dominates over direct breakup.

Fusion suppression at energies above the barrier.

Abstract

We consider the influence of breakup channels on the complete fusion of weakly bound systems in terms of dynamic polarization potentials. It is argued that the enhancement of the cross section at sub-barrier energies may be consistent with recent experimental observations that nucleon transfer, often leading to breakup, is dominant compared to direct breakup. The main trends of the experimental complete fusion cross section for $^{6,7}$Li + $^{209}$Bi are analyzed in the framework of the DPP approach.