Abstract
Aiming to produce new neutron-rich nuclei around $N=126$, the multi-nucleon transfer reaction $^{136}$Xe+$^{194}$Ir is investigated by using the GRAZING model and the three-dimensional time-dependent Hartree-Fock (TDHF) approach. De-excitation processes of the primary fragments are taken into account in both models. The results of GRAZING indicate that this system is a promising candidate for producing new neutron-rich isotones with $N=126$. In contrast, no such nuclei are observed in TDHF. Nucleon transfer process in TDHF collisions is studied and the relation to final isotopic production cross sections is discussed.
Highlights
Neutron-rich nuclei are of great importance for understanding the astrophysical r-process [1]
The results of GRAZING are shown as blue solid lines while those of time-dependent Hartree-Fock (TDHF)+GEMINI are presented as black dashed lines
As the number of transferred nucleons increases, discrepancies between model predictions and the experimental data get larger. These isotopes far away from the entrance channel may be produced in strongly damped collisions. Such processes can not be well estimated by the two models: two-body collisions are not considered in TDHF [57, 58] while the GRAZING model only takes grazing collisions into account
Summary
Neutron-rich nuclei are of great importance for understanding the astrophysical r-process [1]. The experimental results of 136Xe + 198Pt at the incident energy of 8 MeV/nucleon [2] show that the production cross sections of neutron-rich nuclei with N = 126 are orders of magnitude larger than those obtained in fragmentation reaction of 208Pb (1 AGeV) + Be [5]. The GRAZING model and TDHF theory incorporating with GEMINI++1 [36] are adopted to investigate the production of neutron-rich nuclei in MNT reactions. The TDHF theory [37] is based on the independent particle picture and is a good approximation to the nuclear many-body problem It is capable of describing low-energy heavy-ion reactions and provides insight on the average behavior of the dynamics.
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