Abstract
The study of inelastic scattering and multi-nucleon transfer reactions was performed by bombarding a 9Be target with a 3He beam at the incident energy of 30 MeV. Angular distributions for 9Be(3He, 3He) 9Be, 9Be (3He, 3He) 8Be, 9Be (3He, 7Be) 5He, 9Be (3He, 6Li) 6Li and 9Be (3He, 7Li) 5Li reaction channels were measured. Experimental angular distributions for the corresponding ground states (g.s.) were analyzed within the framework of the optical model, the coupled-channel approach and the distorted-wave Born approximation. 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 was constrained by two-body kinematics. Information on the cluster structure of 9Be was obtained from the transfer channels. It was concluded that cluster transfer was an important mechanism in the investigated nuclear reaction channels. In the present work an attempt was made to estimate the relative strengths of the interesting (n + 8Be) and (α + 5He) cluster configurations in 9Be. The contributions of different exit channels have been determined confirming that the (α + 5He) configuration plays an important role. The configuration of 8Be consisting of two bound helium clusters (5He + 6He) is significantly suppressed, whereas the two-body configurations (n + 8Be) and (α + 5He) including unbound 8Be and 5He are found more probable.
Highlights
In recent years the study of light radioactive nuclei [1] [2] has intensified due to the significant progress made with radioactive beam facilities
The angular distribution for the 7Be + 5He (♦) channel corresponds to the ground state and the first-excited state of 7Be
The performed analysis of the experimental data shows that the potential parameters are quite sensitive to the exit channel and to the cluster structure of the populated states, which allows to make general observations and conclusions regarding the internal structure of the target and exit channel nuclei
Summary
In recent years the study of light radioactive nuclei [1] [2] has intensified due to the significant progress made with radioactive beam facilities. The cluster structure of their ground as well as low-lying excited states became the focus of theoretical and experimental studies. Due to its Borromean structure, a special attention has been focused on the 9Be nucleus, which may break up directly to α + α + n or via one of two unstable intermediate nuclei: 8Be or 5He
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