Effects of nucleus orientation on transfer process and production of unknown neutron-rich isotopes with Z=62–75 in Hg204+Th232 based on the dinuclear system model

Abstract

Within the framework of the dinuclear system model, the contributions of the constituent parts of the driving potentials in different orientation configurations in the $^{86}\mathrm{Kr}+^{166}\mathrm{Er}$ reaction are investigated. The Coulomb potential plays a predominant role in the change of driving potential among different configurations with mass number ${A}_{1}=52--200$. In the region of ${A}_{1}<52$ and ${A}_{1}>200$, the effects of the nuclear potential increased significantly. This work also studied the multinucleon transfer process of $^{204}\mathrm{Hg}+^{232}\mathrm{Th}$ in tip-to-tip and side-to-side configurations to produce unknown neutron-rich isotopes with $Z=62--75$. In the $^{204}\mathrm{Hg}+^{232}\mathrm{Th}$ reaction, the tip-to-tip configuration accounts for the main contribution to produce unknown neutron-rich isotopes with $Z=62--75$ because of the ``inverse'' quasifission process. The optimal incident energy is 678.1 MeV. Considering the experimental conditions provided by the experiments, there are 29 unknown isotopes whose production rate is greater than one count per day. Especially, the production rates per day of $^{179}\mathrm{Ho}, ^{181,182}\mathrm{Er}, ^{182,183,184}\mathrm{Tm}, ^{186}\mathrm{Yb}, ^{189}\mathrm{Lu}, ^{191,192}\mathrm{Hf}$, and $^{195}\mathrm{Ta}$ are 21, 25, 13, 701, 1217, 29, 94, 29, 102, 29, and 20, respectively. The reaction of $^{204}\mathrm{Hg}+^{232}\mathrm{Th}$ at 678.1 MeV is a potential candidate to produce new neutron-rich nuclei with $Z=62--75$.