重离子碰撞中超重核的形成机制

原子核物理评论 , 2006, 23(4): 387-396. doi: 10.3969/j.issn.1007-4627.2006.04.007

重离子碰撞中超重核的形成机制

李君清 ^1, , 左维 ^2, , 冯兆庆 ^3, , 靳根明 ^4, , 赵恩广 ^5,

基金项目: 德国DFG基金会资助项目国家自然科学基金(10505016;10235020;10475099;10375001) Financial Support from DFG of Germany 中国科学院知识创新工程项目(KJCX2-SW-No17)

关键词：超重核 , 双核系统 , 驱动势 , 主方程 , 全熔合

Formation Mechanism of Super Heavy Nuclei in Heavy-ion Collisions

Keywords： super heavy-nuclei , dinuclear system , driving potential , master equation , complete fusion

在双核模型框架下, 用数值解主方程方法计算了超重核的熔合几率. 明确描述了包含能量、角动量和碎片形变弛豫的相对运动, 并与核子扩散过程相耦合. 因此, 用微观方法推导出的核子跃迁几率是与时间相关的. 所计算的以Pb为靶的冷熔合超重核形成截面和以48Ca为弹核的热熔合超重核形成激发函数与已知的实验值在合理的范围内符合.

In the dinuclear system conception, the master equation is solved numerically to calculate the fusion probabilities of super-heavy nuclei. The relative motion concerning the energy, the angular momentum and the fragment deformation relaxations is explicitly treated to couple with the diffusion process. The nucleon transition probabilities, which are derived microscopically, are related with the energy dissipation of the relative motion, thus they are time-dependent. The formation cross sections of the super-heavy nuclei from Pb-based cold fusion and excitation functions from 48Ca induced hot fusion are reasonably consistent with known experimental data.

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