基于ImIQMD模型对近垒重系统准裂变反应的研究

原子核物理评论 , 2009, 26(1): 8-12.

基于ImIQMD模型对近垒重系统准裂变反应的研究

赵旭林 ^1, , 靳根明 ^2, , 冯兆庆 ^3, , 付芬 ^4,

1.中国科学院近代物理研究所,甘肃,兰州,730000;中国科学院研究生院,北京,100049

2.中国科学院近代物理研究所,甘肃,兰州,730000;兰州重离子加速器国家实验室理论中心,甘肃,兰州,730000

3.中国科学院近代物理研究所,甘肃,兰州,730000

4.中国科学院近代物理研究所,甘肃,兰州,730000;中国科学院研究生院,北京,100049

基金项目: 国家自然科学基金(10475100)

关键词： ImIQMD模型 , 准裂变 , 产生截面 , 碎片分布

ImIQMD Simulation of Quas-fission Reaction of Heavy-system near Coulomb Barrier

Keywords： ImIQMD model , quasi-fission , cross section , fragment distribution

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~(48)Ca+~(208)Pb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 ~(48)Ca+~(208)Pb 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.

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