DREB2018 -- 10th International Conference on Direct Reactions with Exotic Beams

Effect of shell correction on the dynamics of 203Pb* nucleus within collective clusterization approach

Not scheduled

15m

Kunibiki Messe (Matsue)

Poster Contribution

Speaker

Dr Raj Kumar (Thapar Institute of Engineering and Technology, Patiala-147004, Punjab, INDIA)

Description

During the collision of heavy ions, their associated shell structure gets significantly modified, leaving corresponding impact on the dynamics of decaying clusters/fragments. Clustering of nucleons play a significant role in the decay analysis of excited compound systems formed via heavy ion reactions. For an overall understanding of the nuclear dynamics, a collective clusterization model is developed for addressing excited-state decay and is termed as dynamical cluster-decay model (DCM) [1]. In this model, all possible decay fragments are taken into account, where the yield of each set of binary fragment gets influenced by the relative yield of rest of the combinations. In the present work, the application of DCM is exercised to 6Li+197Au -> 203Pb* reaction, with a specific reference to the relevance of shell corrections. In context of recent experimental data [2], fusion-evaporation cross sections of this reaction are fitted using the optimized neck length with and without inclusion of shell corrections, for a wide range of incident energies spread across the Coulomb barrier. It is observed that the shell corrections affect the fusion-evaporation cross sections significantly and as expected the use of shell correction becomes indispensable at below barrier region. The removal of shell correction energy lowers the fusion-evaporation cross sections as compared to the one which are calculated with the inclusion of shell correction energy. In other words, 6Li+197Au reaction hinders to fuse when the shell correction is not included in the dynamics. However, to make an overall understanding of the effect of shell correction energy on the reaction dynamics, we have explored this effect for a variety of nuclear reactions forming the compound nuclei in the mass region 100 to 200. In this mass region, the shell correction energy have positive or negative impact on the fusion-evaporation cross-sections which depends upon the type of fragments minimized and their associated shell correction energy that are different for the decay of different compound nuclei.

REFERENCES

1. R. K. Gupta, Clusters in Nuclei, Lecture Notes in Physics 818, 223 (2010).
2. C. S. Palshetkar et. al., Phys. Rev. C 89, 024607 (2014).