ImIQMD simulation of quas-fission reaction of heavy-system near coulomb barrier

Based on the improved isospin dependent quantum molecular dynamics (ImIQMD) model, the reaction of 48Ca+208Pb at energies near the Coulomb barrier was investigated systematically. The capture cross section, the quasi-fission cross section, the mass distribution of the quasi-fission fragments and the time for quasi-fission happened were obtained. According to the comparison with experimental data, the calculated capture cross sections and the fragment distributions of the quasi-fission were reasonable. Additionally, we got the cross sections of the third largest fragment, and the emission mechanism was also discussed briefly. (authors)