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The multinucleon transfer process is one promising approach for producingneutron-rich heavy nuclei. The favorable projectile-target combinations play akey role in experiments. As one important approach to investigate themultinucleon transfer process, one new version of the dinuclear system (DNS)model is developed. The improved version of the DNS model is shown in detail.Based on deformation degree of freedom in the improved DNS model, one way ofcalculating excitation energies of primary fragments is proposed. And theremarkable improvements for describing experimental data of producingtrans-uranium nuclei is noticed. To produce trans-uranium nuclei, thecollisions of 48Ca, 136Xe, and 238U projectiles with the 238U target areinvestigated within the improved DNS model. Based on the potential energysurface, the influence of projectiles on the probabilities of transferringneutrons and protons from the projectiles to the target are studied. Onebehavior is found that the transfer probabilities strongly depend on theprojectiles in the neutron stripping process, while relatively weak projectiledependence is noticed in the proton transferring process. The 136Xe and 238Uprojectiles show great advantages of cross sections for producing neutron-richtrans-uranium nuclei, although the fission probabilities are large.

Selection of projectiles for producing trans-uranium nuclei in transfer reactions within an improved dinuclear system model