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首页> 外文期刊>Physical review, C >Dissipation and tunneling in heavy-ion reactions near the Coulomb barrier
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Dissipation and tunneling in heavy-ion reactions near the Coulomb barrier

机译：库仑屏障附近的重离子反应中的耗散和隧道

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摘要

Influence of couplings to collective excitations on fusion process has been well established experimentally and theoretically. Much less is known about the influence of dissipation caused by transfer reactions, even less due to noncollective excitations. In this paper, we report the results of the comparison of experimental barrier distributions with the CC + RMT model calculations taking into account noncollective excitations, in which the stationary coupled channels method is merged with a statistical approach based on the random matrix theory. In spite of many assumptions and approximations, we find that the model works well for medium systems without fitting parameters, describing the influence of dissipation on tunneling. On the other hand, for heavier systems this mechanism does not appear to be sufficient. This points to the importance of other dissipation mechanisms for these systems, such as nucleon transfer processes.
机译：联轴器对融合过程集体激发的影响已在实验和理论上得到了很好的建立。 关于由于非校集激发而导致的转移反应引起的耗散的影响越来越少。 在本文中，我们报告了与CC + RMT模型计算的实验屏障分布的比较结果，考虑到非卷合激发，其中静止耦合通道方法以基于随机矩阵理论的统计方法合并。 尽管有许多假设和近似值，但我们发现模型适用于中等系统而不拟合参数，描述耗散对隧道的影响。 另一方面，对于较重的系统，这种机制似乎是足够的。 这指出了这些系统的其他耗散机制的重要性，例如核子转移过程。

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