Cluster Structure of 9Be from 3He+9Be Reaction

Abstract

The study of inelastic scattering and multi-nucleon transfer reactions was performed by bombarding a 9Be target with a 3He beam at an incident energy of 30 MeV. Angular distributions for 9Be(3He,3He)9Be, 9Be(3He,4He)8Be, 9Be(3He,7Be)5He, 9Be(3He,6Li)6Li and 9Be(3He,7Li)5Li reaction channels were measured. Cross sections for channels leading to unbound 5Heg.s., 5Lig.s. and 8Be systems were obtained from singles measurements where the relationship between the energy and the scattering angle of the observed stable ejectile is constrained by two-body kinematics. Information on the cluster structure of 9Be was obtained from the transfer channels. It was concluded that cluster transfer is an important mechanism in the investigated nuclear reactions. In the present work an attempt was made to estimate the relative strengths of the interesting 8Be+n and 5He+α cluster configurations in 9Be. The branching ratios have been determined confirming that the 5He+α configuration plays an important role. The configuration of 9 Be consisting of two bound helium clusters 3He+6He is significantly suppressed, whereas the two-body configurations 8Be+n and 5He+α including unbound 8Be and 5He are found more probable.