Pair and single neutron transfer with Borromean 8 He

Abstract

Direct observation of the survival of199Au residues after 2n transfer in the He8+Au197 system and the absence of the corresponding67Cu in the He8+Cu65 system at various energies are reported. The measurements of the surprisingly large cross sections for199Au, coupled with the integral cross sections for the various Au residues, is used to obtain the first model-independent lower limits on the ratio of 2n to 1n transfer cross sections from8He to a heavy target. A comparison of the transfer cross sections for6,8He on these targets highlights the differences in the interactions of these Borromean nuclei. These measurements for the most neutron-rich nuclei on different targets highlight the need to probe the reaction mechanism with various targets and represent an experimental advance towards understanding specific features of pairing in the dynamics of dilute nuclear systems.