Isospin influence on the decay of compound nuclei formed in 78,82Kr + 40Ca and 78,86Kr + 40,48Ca reactions

Abstract

Isospin influence on the decay of hot and rotating compound systems 118,122Ba⁎ and 118,134Ba⁎ formed in 78,82Kr + 40Ca and 78,86Kr + 40,48Ca reactions at incident energies 5.5 and 10 MeV/A, respectively, has been studied using the dynamical cluster-decay model. Binding energies used in the model have been calculated using semi-empirical mass formula of Davidson et al., where the bulk and asymmetry constants have been adjusted to reproduce the ground state mass excess for all the nuclei which have been added to AME2003 and mass table in Möller et al. 1995 to build AME2016 and FRDM2012 data. The theoretical mass excess is considered only for those cases where experimental mass excess was not available. The shell corrections have been calculated with shell closures at 2, 8, 14, 28, 50, 82, 126, 184 for both protons and neutrons and 258 for neutron only. The influence of isospin and incident energies have been seen on the following: mass and charge distribution of the fragments, de-excitation/evaporation, binary decay/fission processes of the compound system, odd-even staggering, isotopic composition, angular momentum distribution of preformation probabilities and decay cross-sections for evaporation and fission like events. The calculated cross-sections for evaporation and fission like events have been compared with experiments and the role of angular momentum on decay/fission processes have been discussed.