Investigation of complete and incomplete fusion in $^{7}$Li+$^{124}$Sn reaction around Coulomb barrier energies

TL;DR

This study measures and analyzes complete and incomplete fusion cross sections in the $^{7}$Li+$^{124}$Sn reaction around Coulomb barrier energies, revealing suppression of complete fusion and dominance of incomplete fusion at sub-barrier energies.

Contribution

It provides experimental data and theoretical analysis of fusion processes, highlighting suppression of complete fusion and the dominance of incomplete fusion at certain energies.

Findings

Complete fusion cross sections are suppressed by ~26% above the Coulomb barrier.

Incomplete fusion, especially $ extit{t}$-capture, dominates at all measured energies.

Fusion cross section ratios indicate ICF dominance below and CF dominance above the barrier.

Abstract

The complete and incomplete fusion cross sections for $^{7}$Li+$^{124}$Sn reaction were measured using online and offline characteristic $\gamma$-ray detection techniques. The complete fusion (CF) cross sections at energies above the Coulomb barrier were found to be suppressed by $\sim$ 26 \% compared to the coupled channel calculations. This suppression observed in complete fusion cross sections is found to be commensurate with the measured total incomplete fusion (ICF) cross sections. There is a distinct feature observed in the ICF cross sections, i.e., $\textit{t}$-capture is found to be dominant than $\alpha$-capture at all the measured energies. A simultaneous explanation of complete, incomplete and total fusion (TF) data was also obtained from the calculations based on Continuum Discretized Coupled Channel method with short range imaginary potentials. The cross section ratios of CF/TF and ICF/TF obtained from the data as well as the calculations showed the dominance of ICF at below barrier energies and CF at above barrier energies.