Microscopic Dynamics Simulations Of Multinucleon Transfer Reaction

This dissertation includes two aspects of work with a microscopic dynamics mod-el:the newest version v2.2 of improved quantum molecular dynamics(ImQMD)model and a statistical decay model:GEMINI code.The first is microscopic dynamics sim-ulations of multinucleon transfer in 86Kr+ 64Ni at 25 MeV/nucleon.and the second is about multinucleon transfer reaction in 154Sm+160Gd.Firstly,multinucleon transfer in 86Kr+ 64Ni at an incident energy of 25 MeV/nucleon is for the first time investigated with ImQMD model.The measured isotope distributions are reasonably well reproduced by using the ImQMD model to-gether with GEMINI code for describing the secondary decay of fragments.The re-action mechanism is explored with the microscopic dynamics simulations from central to peripheral collisions.In central collisions there exists a strong competition among fusion,deep-inelastic scattering,and multifragmentation at such an incident energy.In semiperipheral collisions,binary scattering together with nucleon transfer is dominant,and the probability of elastic + inelastic scattering events increases rapidly with impact parameter in peripheral collisions and approaches one when b>14 fm.The mass-total kinetic energy distribution in central collisions due to the competition is quite different from those in peripheral collisions and the distribution of total kinetic energy loss for binary events with nucleon transfer is much more broader than those without transferSecondly,based on the work of Wang Ning et al,multinucleon transfer reaction in 154Sm+160Gd at incident energies close to the Coulomb barrier(Ec.m.=440 MeV)is further investigated with ImQMD + GEMINI model.The mass-TKE distribution of the primary fragments in each collision parameter is investigated.From the energy point of view,one can conclude the system almost did not occur fusion events at this energy,which is consistent with the results of Wang Ning et al.To be better of the theoret-ical estimates,we analyzed the statistical error of the production cross sections of the unmeasured nuclei.Finally,we investigated the influence of the incident energy and the mass asymmetry of projectile-target on the production cross sections of projectile-like fragments(PLFs)and target-like fragments(TLFs).It is interesting to find that the production of neutron-rich nuclei does not depend on the incident energy,however,the higher energy is favorable to producing the proton-rich nuclei.To be more favorable producing the goal nuclei,target mass should be more close to projectile nuclei.