Entrance-channel mass-asymmetry dependence of compound nucleus formation time in light heavy-ion reactions

The entrance-channel mass-asymmetry dependence of the compound nucleus formation time in light heavy-ion reactions has been investigated within the framework of semiclassical dissipative collision models, The model calculations have been applied successfully to the formation of the Ar-38 compound nucleus as populated via the Be-9+Si-29, B-11+Al-27, C-12+Mg-26, and F-19+F-19 entrance channels. The shape evolution of several other light composite systems appears to be consistent with the so-called ''Fusion Inhibition Factor'' which has been observed experimentally. As found previously in more massive systems for the fusion-evaporation process, the entrance-channel mass-asymmetry degree of freedom appears to determine the competition between the different mechanisms as well as the time scales involved.