Dynamics of weakly bound projectile induced reactions using fragmentation approach

Abstract

The current wave of interest is, understanding the structure and dominant reaction mechanism of loosely bound nuclei or one can say that the nuclei far from stability. Reactions induced with loosely bound nuclei are substantial as in these reactions, the processes apart from complete fusion (CF) and transfer reactions can be observed. Many other processes such as incomplete fusion, quasi fission, and deep inelastic collision may also be observed. Hence the advantage of studying such reactions is that the effect of loosely bound nuclei on fusion and consequently on the decay of the compound nucleus can be explored, which in turn provides deeper insight of associated aspects. In this work, we have investigated the decay of 217Rn* and 218Fr* nuclei formed respectively in 9Be + 208Pb and 9Be + 209Bi reactions. All calculations have been done within dynamical cluster decay model (DCM) framework in reference to the experimental data of 2010. In order to deal with the experimental data, one needs to have heedful insight into various extremities like excitation energy, angular momentum and temperature etc. Interestingly, DCM with all these features included into it, imparts information for the decay patterns of the nuclear systems formed in heavy ion reactions. The study of decay of given compound nuclei have been carried out by taking quadrupole deformations (β2) i.e. prolate and oblate, and the two possibilities of decay have been observed i.e. evaporation residue and fission, whereas fission contribution is found to be negligibly small as compared to evaporation residue. Further, as 9Be being loosely bound nuclei may disintegrate into 5He and 4He as given in experimental data, this weakly bound characteristic of 9Be may lead to the fusion of either 5He or 4He with respective targets, leading to incomplete fusion. Thus the decay study of incomplete fusion has also been carried out in terms of evaporation residue production in framework of DCM.