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arXiv 1507.00645nucl-th
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重离子碰撞中的Skyrme张量力

The Skyrme Tensor Force in Heavy Ion Collisions

P. D. Stevenson, E. B. Suckling, S. Fracasso, M. C. Barton, A. S. Umar

摘要:

背景资料:[省略arXiv字符计数]目的:随着计算能力的提高,现在可以在没有任何对称性假设的情况下进行TDHF计算,并将原子核结构社区在改进这些计算中使用的能量密度泛函方面取得的重大进展纳入其中。特别是,这些泛函中的时间奇项和张量项在动力学演化过程中自然存在,而对于大多数静态计算来说不存在或最小重要。这些项的参数由伽利略不变性或局域规范不变性的要求决定,但它们对反应动力学的意义尚未得到充分研究。这项工作解决了这个问题,强调张量力。方法:完整版本的Skyrme力,包括只从Skyrme张量力所产生的条款,适用于一个完全无限制的TDHF实现内的碰撞研究。结果如下:我们研究的融合阈值的影响和没有张量力项,并发现融合阈值能量的顺序几兆电子伏的效果。还讨论了在能量密度泛函项内能量分布的细节。结论:与张量力相关的能量密度泛函中的项可以在核的动态过程中发挥不可忽略的作用,包括那些项不影响基态性质的项。

英文摘要:

Background: [elided for arXiv character count] Purpose: With the advancement of computational power it is now possible to undertake TDHF calculations without any symmetry assumptions and incorporate the major strides made by the nuclear structure community in improving the energy density functionals used in these calculations. In particular, time-odd and tensor terms in these functionals are naturally present during the dynamical evolution, while being absent or minimally important for most static calculations. The parameters of these terms are determined by the requirement of Galilean invariance or local gauge invariance but their significance for the reaction dynamics have not been fully studied. This work addresses this question with emphasis on the tensor force. Method: The full version of the Skyrme force, including terms arising only from the Skyrme tensor force, is applied to the study of collisions within a completely symmetry-unrestricted TDHF implementation. Results: We examine the effect on fusion thresholds with and without the tensor force terms and find an effect on the fusion threshold energy of the order several MeV. Details of the distribution of the energy within terms in the energy density functional is also discussed. Conclusions: Terms in the energy density functional linked to the tensor force can play a non-negligible role in dynamic processes in nuclei, including those in which the terms do not affect ground state properties.

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