Exploiting barrier distributions to investigate breakup effects in the fusion of 9Be + 208Pb

Abstract

Preliminary data on the fusion of 36 S + 96 Zr are reported; the excitation function near the barrier is intermediate between those of 40 Ca + 90;96 Zr. The peculiar role of the strong 3` octupole vibration of 96 Zr is pointed out, in addition to the couplings to neutron transfer channels with positive Q-values. Recent data on 40 Ca + 124 Sn are also shown; for that system the fusion barrier distribution is wide without separated peaks, similar to the case of 40 Ca + 96 Zr. Simplified coupled-channel calculations have been performed, including surface vibrations and sequential neutron pick-up channels, with form factors that fit the single- and multi-nucleon transfer data for 40 Ca + 124 Sn. A good agreement with the data is found.