Formation of superheavy nuclei in cold fusion reactions
Formation of superheavy nuclei in cold fusion reactions
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冷聚变反应中超重核的形成
DOI：
10.1103/physrevc.76.044606
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发表时间：
2007-07
影响因子：
3.1
通讯作者：
中科院分区：
文献类型：
--
作者：
在双核系统（DNS）的概念下，通过将相对运动耦合到核子转移过程，提出了一个描述完全聚变反应中超重核形成的动力学模型。分别采用经验耦合道模型、数值求解主方程和应用统计理论计算了两重碰撞核的俘获、复合核的形成和去激发过程。本文系统地研究了冷聚变反应中蒸发剩余物的激发函数，并与已有的实验数据进行了比较。得到了稳定丰中子弹冷聚变反应中超重核的最大产生截面。系统地分析了超重元素Z=110、112、114、116、118和120产生的同位素趋势。提出了最佳组合和相应的激发能。
Within the concept of the dinuclear system (DNS), a dynamical model is proposed for describing the formation of superheavy nuclei in complete fusion reactions by incorporating the coupling of the relative motion to the nucleon transfer process. The capture of two heavy colliding nuclei, the formation of the compound nucleus, and the de-excitation process are calculated by using an empirical coupled channel model, solving a master equation numerically and applying statistical theory, respectively. Evaporation residue excitation functions in cold fusion reactions are investigated systematically and compared with available experimental data. Maximal production cross sections of superheavy nuclei in cold fusion reactions with stable neutron-rich projectiles are obtained. Isotopic trends in the production of the superheavy elements Z=110, 112, 114, 116, 118, and 120 are analyzed systematically. Optimal combinations and the corresponding excitation energies are proposed.