Breakup reaction studies of ¹⁰Be and ¹⁰,¹¹B using a ¹⁰Be beam

The structure of Be-10,has been investigated by inelastic scattering to states above the breakup threshold using the reaction C-12(Be-10, Be-10*-->He-6+He-4)C-12 at E-beam=302 MeV. Excited states in Be-10 were observed at 9.6+/-0.1 and 10.2+/-0.1 MeV. No evidence was observed for the population of the 4(+) member of the ground-state band of Be-10 indicating the shell-model-like structure of the ground state. In addition, the decay of Be-8, B-10, and B-11, populated in the two-neutron, proton pickup, breakup and 1p pickup reactions, was reconstructed through the detection of coincident He-4+He-4, He-4+Li-6, and He-4+Li-7 particles. Cross sections for the formation of the Be-8, Be-9, B-10, and B-11 were also deduced. Contrary to expectations, the two-neutron removal results in the production of Be-8 predominantly (80%) in the first excited (2(+)) state. This suggests that dynamical excitations play an important role in the neutron removal process.