Speaker
Description
A systematic investigation of fusion reactions induced by $^{16}$O is carried out. Within the double-folding formalism, the nucleus–nucleus interaction potential is constructed using both density-independent nucleon–nucleon interactions (B3Y-Fetal, M3Y-Paris, and M3Y-Reid) and density-dependent interactions (BDM3Y1, CDM3Y6, and DDM3Y1). The reactions $^{16}{\rm O}+{}^{70,72,74,76}{\rm Ge}$, $^{16}{\rm O}+{}^{112,116,118,120}{\rm Sn}$, $^{16}{\rm O}+{}^{144,148,154}{\rm Sm}$, $^{16}{\rm O}+{}^{186}{\rm W}$ and $^{16}{\rm O}+{}^{208}{\rm Pb}$ are considered. Two groups of interactions exhibiting similar fusion cross sections are identified, with the similarities becoming more pronounced as the target mass increases. On one hand, potentials derived from the B3Y-Fetal and BDM3Y1 interactions yield comparable fusion cross sections; on the other hand, those obtained from the M3Y-Paris, M3Y-Reid, CDM3Y6, and DDM3Y1 interactions also produce similar results. The former group generally provides a better description of the experimental data, except for the $^{120}$Sn for which the latter group offers the best fit.
The analysis of the channel couplings strength reveals that BDM3Y1 interaction corresponds to the strongest channel couplings. It is also observed that the strength of channel couplings does not vary monotonically with the atomic mass, as might be expected.
In light of these results, it follows that the B3Y-Fetal and BDM3Y1 nucleon-nucleon interactions systematically provide a better description of the experimental data. Furthermore, there are no specific features in the fusion cross sections that can be attributed solely to whether the nucleon-nucleon interaction is density-dependent or density-independent. This conclusion is supported by the identified two groups of nucleon-nucleon interactions, each containing density-dependent and density-independent interactions.