关键词: 
ImIQMD模型 /
准裂变 /
产生截面 /
碎片分布

摘要: 利用改进的同位旋相关的量子分子动力学(ImIQMD)模型程序，对能量在库仑位垒附近的48Ca+208Pb反应系统进行了模拟。 计算得到的俘获截面、 准裂变截面和碎片分布及其发生的时间分布等结果与实验数据符合较好。 同时还得到了准裂变过程中发射第三个较大碎片的截面， 并简单讨论了它们的发射机制。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.