Production mechanism and prediction cross sections of unknown neutron-rich 263-265,267-269Lr isotopes in multinucleon transfer reactions based on the dinuclear system model

Within the framework of the dinuclear system model, the production cross sections for producing the new neutron-rich Lr isotopes in the multinucleon transfer reactions with Bk-249 and Es-254 targets were predicted. The results show that the Sn-124 + Es-254 reaction has the highest production cross sections, followed by the Te-130 + Bk-249 reaction. As far as the existing experimental techniques are concerned, Te-130 + Bk-249 is the most suitable choice. With experimental techniques developing in the future, Sn-124 + Es-254 is preferable when the thick Es-254 target can be prepared. The optimal energy for producing the new neutron-rich Lr isotopes is 1.1 times the Coulomb barrier for both reaction systems, and both reactions produced Lr-263-265,Lr-267-269 isotopes. The production mechanism of Lr isotopes has been investigated in the Te-130 + Bk-249 reaction. It is found that the production of Lr isotopes mainly originates from the contribution of quasifission. And the contribution of quasifission gradually decreases with the increase of the incident angular momentum. The final production cross sections for Lr-263-265,Lr-267-269 in Te-130 + Bk-249 reaction at E (c.m.) = 1.10V (C) are 0.22 mu b, 0.13 mu b, 0.15 mu b, 4.45 nb, 0.62 nb, and 0.03 nb, respectively

Automated summary

The production cross sections for producing the new neutron-rich Lr isotopes in multinucleon transfer reactions with Bk-249 and Es-254 targets were predicted within the framework of the dinuclear system model. The results showed that the Sn-124 + Es-254 reaction had the highest production cross sections, followed by the Te-130 + Bk-249 reaction. Te-130 + Bk-249 was considered the most suitable choice based on existing experimental techniques.