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arXiv 1208.2472nucl-thnucl-ex
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开壳层核的从头计算Gorkov-Green函数

Ab-initio Gorkov-Green's function calculations of open-shell nuclei

V. Soma, C. Barbieri, T. Duguet

摘要:

我们提出了一种新的从头计算方法,使用自洽的Gorkov格林函数理论来解决真正的开壳层系统的结果。形式主义最近已经制定了二阶,并在这里实施的第一次在现实的核力的基础上的核。我们发现良好的收敛性的结果相对于Ca 44和Ni 74的基础尺寸和讨论的实验感兴趣的量,包括基态能量,配对间隙和粒子添加/去除光谱。这些结果表明,Gorkov方法是一个有效的替代多参考方法处理简并或近简并量子系统。特别是,它增加了以从头开始方式可获得的中等质量核的数量,从几十个增加到几百个。

英文摘要:

We present results from a new ab-initio method that uses the self-consistent Gorkov Green's function theory to address truly open-shell systems. The formalism has been recently worked out up to second order and is implemented here in nuclei for the first time on the basis of realistic nuclear forces. We find good convergence of the results with respect to the basis size in Ca44 and Ni74 and discuss quantities of experimental interest including ground-state energies, pairing gaps and particle addition/removal spectroscopy. These results demonstrate that the Gorkov method is a valid alternative to multireference approaches for tackling degenerate or near degenerate quantum systems. In particular, it increases the number of mid-mass nuclei accessible in an ab-initio fashion from a few tens to a few hundreds.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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