Investigation of formation time and fusion-fission dynamics in heavy ion induced reactions ³⁰Si+²³²Th, and ¹²C+²³⁸U using dynamical code HICOL

Dynamical model analysis has been carried out for the ³⁰Si+²³²Th, and ¹²C+²³⁸U systems lying on the either side of the Businaro-Gallone critical mass asymmetry (αBG) in order to investigate the mass asymmetry (α) dependence of fusion reactions in these systems. The formation times were calculated as a function of the partial wave of the reaction. Larger formation time for the symmetric system ³⁰Si+²³²Th (α < αBG) has been observed compared to the asymmetric system ¹²C+²³⁸U (α > αBG). Compound nucleus formation percentage is prominent in case of asymmetric system ¹²C+²³⁸U compared to the symmetric system ³⁰Si+²³²Th. These investigations have indicated the dynamical effects involved in the large-scale shape changes taking place in the fusion process in these studied heavy ion induced reactions. (author)