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Fusion-fission of compound nuclei formed in 12,15C induced reactions on 232Th target

The reactions involving fusion-fission of compound nuclei 244,247Cm* formed in low energy heavy ion collisions of 12,15C projectiles with actinide target 232Th have been investigated within dynamical cluster-decay model (DCM). We have probed the effects of transition from a paired to an unpaired valence neutron or halo nature of projectile (15C) on the fusion-fission cross sections (σFF) of decay of compound nuclei (CN) 244,247Cm*, formed in these reactions. The calculations are performed using spherical shape of nuclei at touching configuration at near-barrier energies (Ec.m.= 68-70 MeV) where experimental data is already available. The dynamical behaviour of these reactions is explored via fragmentation potential (V), preformation probability (P0), summed up preformation probability over angular momenta (l) values (ΣP0) and penetrability (P) for fusion-fission fragments (FF) having mass numbers (ACN/2) ±20. It is observed that the overall pattern of fragmentation potential, V(MeV) at different l values remains unaffected, but the potential energy surface (PES) for FF fragments show peculiar behavior with increase in mass of CN. These characteristics of the FF fragments are presented in terms of preformation probability (P0), explicitly. The effect of halo configuration of projectile is evident in the summed-up preformation probabilities (ΣP0) of various FF fragments, which means that the relevant structure information is duly explored. The DCM calculated, normalized values, of σFF are found to be consistent with the experimental data. The observation of enhancement in the magnitude of σFF for neutron-rich matter reveals the modification of nuclear behaviour, as we move towards region close to the drip line.