Direct Nuclear Reactions in Lithium-Lithium Systems: 7Li+7Li at Elab = 2 - 16 MeV

TL;DR

This study measures angular distributions of specific reactions in the 7Li+7Li system at energies 2-16 MeV and uses DWBA analysis to identify direct transfer processes, revealing their dominance and complex energy-dependent contributions.

Contribution

It demonstrates the successful application of DWBA to estimate cross sections in 7Li+7Li reactions and highlights the significant role of direct mechanisms along with other energy-dependent processes.

Findings

DWBA effectively estimates cross sections for 7Li+7Li reactions.

Direct transfer processes are dominant in most reactions studied.

Energy-dependent processes suggest resonance effects superimposed on statistical backgrounds.

Abstract

Angular distributions of 7Li(7Li,t), (7Li,alpha) and (7Li,6He) reactions were measured for laboratory energies from 2 - 16 MeV. Exact finite range DWBA analyses were performed with the aim to identify contributions of direct processes and to investigate the applicability of DWBA to such few nucleon systems. It turned out that DWBA can be successfully applied to estimate differential and total cross sections of direct transfer processes in 7Li+7Li interaction. The direct mechanism was found to play a dominant role in most of these reactions but significant contributions of other, strongly energy dependent processes were also established. It is suggested that these processes might be due to isolated resonances superimposed on the backround of statistical fluctuations arising from interference of compound nucleus and direct transfer contributions.