Systematic study of the decay of118,122Ba*formed in78,82Kr-induced reactions atElab=5.5 MeV/nucleon

Abstract

The dynamical cluster decay model (DCM) is applied in reference to recent data on ${}^{78,82}\mathrm{Kr}\phantom{\rule{0.16em}{0ex}}+{\phantom{\rule{0.16em}{0ex}}}^{40}$Ca reactions at a bombarding energy of 5.5 MeV/nucleon. For the nuclear systems ${}^{118,122}$Ba${}^{*}$, experimental data for the complete charge spectrum are also available along with evaporation residue and fission cross sections. Within the DCM approach, we are able to fit the total fission and evaporation residue cross sections for spherical choice of nuclei by simultaneously fitting the neck length parameter. The effect of different level density parameters is also studied. Results of DCM calculations are compared with busco-, gemini-, and DNS-based calculations. All the models use the maximum angular momentum ${\ensuremath{\ell}}_{\mathrm{max}}$ as the fitting parameter, which in the DCM is fixed via the neck-length parameter ($\ensuremath{\Delta}R$) for the penetrability $P\ensuremath{\rightarrow}1$. Also, the role of a nonzero pairing strength ($\ensuremath{\delta}>0$) is seen, using $\ensuremath{\delta}(T)$ in ${V}_{\mathrm{LDM}}$ as a fitting parameter, say, to Li data. The effect of different proximity potentials is also studied. Finally, some noncompound nucleus contribution is shown to be operating in the context of the reactions under study. The $N$/$Z$ dependence of decay fragments is also studied for Ba isotopes with $A=114$--126.