Reactions with the double-Borromean nucleus 8 He

Differential cross sections for elastic-scattering and neutron-transfer reactions along with cross sections for fusion in the {sup 8}He+{sup 65}Cu system are reported at energies above the Coulomb barrier (E{sub lab}= 19.9 and 30.6 MeV). The present work demonstrates the feasibility of using inclusive measurements of characteristic in-beam {gamma} rays with low-intensity ({approx}10{sup 5} pps) radioactive ion beams to obtain the residue cross sections for fusion and neutron transfer. Exclusive measurements of {gamma} rays in coincidence with light charged particles have been used to further characterize the direct reactions induced by this double-Borromean nucleus. Coupled reaction channels calculations are used to illustrate the important role played by the transfer channels and to help in understanding the influence of the structure of {sup 8}He on the reaction mechanism.