Role of shell and pairing correction in the dynamics of compound nuclei with ACN = 118–196 using collective clusterization approach

Abstract

Shell and pairing correction are known to significantly affect the binding energy of a nucleus. In the present work, the effect of shell correction and pairing energy on the fusion-evaporation cross sections (σER) and the reaction dynamics of five different hot and rotating compound systems 118Xe⁎, 128Ce⁎, 146Sm⁎, 172Yb⁎, and 196Pt⁎ formed via respective entrance channels namely Si28+Zr90 (ηi=0.525), S32+Mo96 (ηi=0.5), 36S + 110Pd (ηi=0.506), 124Sn + 48Ca (ηi=0.442) and 132Sn + 64Ni (ηi=0.346) (ηi represents the entrance channel mass asymmetry) is studied within the collective clusterization approach. The basis of choosing these reactions is to keep entrance channel mass asymmetry in such a way that the temperature (T) of the compound systems lie in the common range of 1.6 MeV to 1.9 MeV corresponding to the available experimental data. It is observed that the magnitude of fragmentation potential and preformation probability of decaying fragments is influenced with the inclusion of shell correction and pairing energy, while the overall decay pattern remains unaffected except that, few fragments minimized in energy correspond to different atomic (Z)-number compared to the case when the shell and pairing correction is not taken into account. The change of magnitude ultimately modifies the fusion-evaporation cross sections of the compound systems. The effect is more pronounced at the lower temperature or below barrier incident energies. The pairing energy has a relatively lesser influence on the considered observables as compared to the shell correction term. The order of sequence in which the shell and pairing energy is switched off leaves the decay structure unaltered, however the fusion-evaporation cross sections are influenced significantly if the charge of evaporation residue (ER) gets changed.