Impact of noncoplanar degrees of freedom on quasifission contributions with the estimation of unobserved decay channels for the study of Pt*196 using the dynamical cluster-decay model

Abstract

In Phys. Rev. C 98, 041603 (2018) it was demonstrated that the noncoplanar degrees of freedom (or azimuthal angle ${\mathrm{\ensuremath{\Phi}}}_{c}\ensuremath{\ne}{0}^{0}$), including higher-multipole deformations ${\ensuremath{\beta}}_{\ensuremath{\lambda}i}$ ($\ensuremath{\lambda}=2,3,4;\phantom{\rule{4pt}{0ex}}i=1,2$), and the compact orientations ${\ensuremath{\theta}}_{ci}$ are the most essential set of parameters in the dynamical cluster-decay model (DCM), in order to study heavy-ion reactions. In this work, we study the comparison between the coplanar ($\mathrm{\ensuremath{\Phi}}={0}^{\ensuremath{\circ}}$) and noncoplanar (${\mathrm{\ensuremath{\Phi}}}_{c}\ensuremath{\ne}{0}^{\ensuremath{\circ}}$) configurations, including higher multipole deformations, for $^{196}\mathrm{Pt}^{*}$ formed via the $^{132}\mathrm{Sn}+^{64}\mathrm{Ni}$ reaction. This reaction was earlier studied [M. K. Sharma et al., J. Phys. G: Nucl. Part. Phys. 38, 055104 (2011)] by one of our collaborators but only with $\mathrm{\ensuremath{\Phi}}={0}^{\ensuremath{\circ}}$, including quadrupole deformations, ${\ensuremath{\beta}}_{2i}$ alone having ``optimum'' orientations (${\ensuremath{\theta}}_{\mathrm{opt}.}$), with the result of noncompound nucleus [nCN, equivalently quasi-fission (qf)] contribution at higher energies. The only parameter of the DCM is the neck length $\mathrm{\ensuremath{\Delta}}R$, whose value for the nuclear proximity potential used here remains within its range of validity ($\ensuremath{\approx}2$ fm). The evaporation residues (ERs) and fission cross section (${\ensuremath{\sigma}}_{ff}$) are calculated in reference to available experimental data at near- and sub-barrier energies for $^{196}\mathrm{Pt}^{*}$. As a result of inclusion of ${\mathrm{\ensuremath{\Phi}}}_{c}\ensuremath{\ne}{0}^{\ensuremath{\circ}}$, the nCN contribution approaches zero at higher energies and corresponds to ${P}_{\mathrm{CN}}=1$, which is rather significant for the $\mathrm{\ensuremath{\Phi}}={0}^{\ensuremath{\circ}}$ configuration. Secondly, in this attempt we have tried to explore the evolution of the neck-length parameter ($\mathrm{\ensuremath{\Delta}}R$), which will help us to estimate the cross sections of unobserved decay channels.