Dynamics of the di-nucleus binary decay: Role of the number of open channels

The coexistence of quasi-molecular resonances, orbiting mechanisms and the fusion-fission (FF) process for medium light di-nuclear systems is examined in terms of the Number of Open Channels (NOC). The calculated NOC, based on a statistical model approach, shows a characteristic dependence which reflects the surface transparency needed to observe both resonant structure and orbiting phenomena. For more absorbing reactions FF has been found experimentally to compete with the fusion-evaporation (FE) process in agreement with larger predicted NOC values. Finally it shown that the coexistence of the statistical fission from the 48Cr compund nucleus (CN) and the resonances arising from very deformed configurations of this di-nucleus are well explained in the framework of the present simple model.