Production of neutron-rich heavy nuclei around N=162 in multinucleon transfer reactions

Within the framework of the dinuclear system model, the production mechanism of neutron-rich heavy nuclei around N = 162 has been investigated systematically. The isotopic yields in the multinucleon transfer reaction of U-238 + Cm-248 are analyzed and compared with the available experimental data at GSI. Systematics on the production of superheavy nuclei via the collisions of U-238 on actinide nuclides Cf-252,Cf-254, Es-254 and and Fm-257 is investigated throughly.I is found that the shell effect is of importance in the formation of neutron-rich nuclei around N = 162 owing to the enhancement of fission barrier and neutron separation energy. The fragments in the multinucleon transfer reactions manifest the broad isotopic distribution and are dependent on the beam energy. The polar angles of the fragments tend to the forward emission with increasing the beam energy. The production cross sections of new isotopes are estimated and the heavier targets are available for the neutron-rich superheavy nucleus formation. The optimal reaction system and beam energy are proposed for the future experimental measurements.

Automated summary

The production mechanism of neutron-rich heavy nuclei around N = 162 within the framework of the dinuclear system model is systematically investigated. It is found that the shell effect plays an important role in the formation of neutron-rich nuclei around N = 162. The fragments in the multinucleon transfer reactions show a broad isotopic distribution and are dependent on the beam energy.