在原子核熔合反应或裂变反应的动力学过程中，颈部变量都起着非常重要的作用。通常情况下，模型中变量的定义根据各种描述宏观形变的参数的不同而不同。为了进一步研究颈部增长在核熔合反应中的作用，通过引入弹核和靶核的形变参量来拓展哑铃模型。在此框架下，计算了从两个接触核到生成一个复合核过程的核熔合反应系统在不同形变下的势能曲面，同时又对核熔合反应体系的惯性张量和粘滞张量进行了计算，这些物理量的计算都为以后的朗之万动力学研究打下了基础。计算结果表明，在改进后的五参数哑铃模型之中，颈部变量是不稳定度并在核反应中起重要作用。
The neck variable plays a key role in the dynamical processes of nuclear fusion or fission. Gen-erally speaking, the definition for this variable is different for various parameterizations describing macroscopic nuclear shapes. In order to investigate the effects of increased neck in nuclear fusion, we extend the dumbbell parameterization by taking deformations of both the target and projectile into account. The potential energy surface (PES) with different shapes of nuclei is calculated, as well as the inertia mass and friction tensors. These calculations lay the foundation for Langevin dynamics. Analysis of the results shows that the neck variable in the proposed five-parameter dumbbell model is an unstable degree of freedom and play an important role in nuclear fusion.
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