Universal damping mechanism of quantum vibrations in deep sub-barrier fusion reactions
Universal damping mechanism of quantum vibrations in deep sub-barrier fusion reactions
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深亚势垒聚变反应中量子振动的通用阻尼机制
DOI：
10.1103/physrevc.92.021602
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Takatoshi Ichikawa and Kenichi Matsuyanagi
中科院分区：
文献类型：
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作者：
Yoritaka Iwata;Takatoshi Ichikawa;Naoyuki Itagaki;Joachim A. Maruhn;and Takaharu Otsuka;Takatoshi Ichikawa and Kenichi Matsuyanagi
我证明了碰撞核耦合强度的坐标依赖性对于描述深亚势垒熔合阻碍是重要的。为此，我首先表现出的扩展耦合通道模型的性能，通过唯象地引入一个阻尼因子的耦合势。阻尼因子的存在使得碰撞原子核的接触点附近的量子振动发生阻尼，并引入了耦合强度的坐标依赖性。其次，通过用无规相位近似方法对激发态的微观计算，直接给出了碰撞核跃迁强度的坐标依赖关系。碰撞核的过渡强度作为质心距离的函数与阻尼因子密切相关，该阻尼因子很好地再现了融合阻碍。这是坐标相关耦合强度概念的直接证明。最后，我们得出结论，接触点附近量子振动的阻尼是深亚势垒熔合阻碍的普遍机制。
I demonstrate that the coordinate dependence of the coupling strengths of colliding nuclei is important for describing the deep sub-barrier fusion hindrance. To this end, I firstly show the performance of an extended coupled-channel model by phenomenologically introducing a damping factor in the coupling potential. The damping factor stimulates the damping of quantum vibrations occurring near the touching point of colliding nuclei and introduce a coordinate dependence in the coupling strengths. Next, I directly show the coordinate dependence of the transition strengths of colliding nuclei by microscopically calculating excited states using the random phase approximation method. The obtained transition strengths of colliding nuclei as a function of the center-of-mass distance strongly correlate with the damping factor that reproduces very well the fusion hindrance. This is a direct justification for the concept of the coordinate-dependent coupling strengths. Finally, I conclude that the damping of quantum vibrations near the touching point is the universal mechanism for the deep sub-barrier fusion hindrance.