Search for quasi-molecular resonances in the62Ni(32S,32S)62Ni reaction

Role of the number of open channels in the dynamics of the dinucleus binary decay

“…The orbiting-cluster model has been recently modified to extend the predictions to medium-light heavy-ion systems [79] and particularly to composite systems with closed neutron or proton ggy2 shells supposed to present resonant behavior with a high probability. However the excitation function and angular distributions measured for the s Ni( S, s2S)s Ni reaction are found to be structure- less [80], similarly to most of the systems heavier than Si+ Si [52,59,60] having a too large NOC for the reaction to be surface transparent. The observation of intermediate structures and doorway states [81] requires not only the density of levels (spreading width) to be small [78,79] but also a small number of channels (NOC) coupled directly with the entrance channel [25,26,77,82] and linked to the escape width of the resonant doorway state.…”