Study of one-step and two-step neutron transfer in the reaction $^{6}$Li + $^{9}$Be

TL;DR

This study investigates neutron transfer mechanisms in the $^{6}$Li + $^{9}$Be reaction at 68 MeV, combining experimental cross section measurements with theoretical analysis to understand cluster structures and transfer processes.

Contribution

It provides the first detailed comparison of experimental data with DWBA calculations for multiple transfer channels in this reaction, highlighting the dineutron cluster transfer's dominance.

Findings

Good agreement between experimental data and DWBA calculations.

Dineutron cluster transfer dominates at forward angles.

Multiple transfer channels characterized and analyzed.

Abstract

The paper presents the results of experiments on measuring the cross sections for elastic scattering and nucleon transfer channels in the $^{6}$Li + $^{9}$Be reaction at an incident energy of 68 MeV: $^{9}$Be($^{6}$Li,$^{6}$Li)$^{9}$Be, $^{9}$Be($^{6}$Li,$^{7}$Li)$^{8}$Be, $^{9}$Be($^{6}$Li,$^{7}$Li)$^{8}$Be$_{2+}$, $^{9}$Be($^{6}$Li,$^{8}$Li)$^{7}$Be, $^{9}$Be($^{6}$Li,$^{7}$Be)$^{8}$Li. The aim is to reveal the manifestation of the cluster structure of $^{9}$Be. Theoretical analysis of the contributions of one-step and two-step neutron transfer mechanisms is performed using the distorted wave Born approximation method with the Fresco code. Good agreement between the calculations and the experimental data was obtained for the channels of elastic scattering $^{9}$Be($^{6}$Li,$^{6}$Li)$^{9}$Be, neutron $^{9}$Be($^{6}$Li,$^{7}$Li)$^{8}$Be and proton transfer $^{9}$Be($^{6}$Li,$^{7}$Be)$^{8}$Li, as well as the transfer of two neutrons $^{9}$Be($^{6}$Li,$^{8}$Li)$^{7}$Be. It is shown that the dineutron cluster transfer mechanism makes a dominant contribution to the $^{9}$Be($^{6}$Li,$^{8}$Li)$^{7}$Be reaction channel at forward angles.