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arXiv 1209.0150nucl-thnucl-ex
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具有裸核子-核子相互作用的Li同位素的张量优化壳层模型

Tensor-optimized shell model for the Li isotopes with a bare nucleon-nucleon interaction

Takayuki Myo, Atsushi Umeya, Hiroshi Toki, Kiyomi Ikeda

摘要:

本文采用张量优化壳层模型(TOSM),以裸核子-核子相互作用作为AV 8 '相互作用,系统地研究了Li同位素。短程相关用酉相关算子方法(UCOM)处理。使用TOSM+UCOM方法,我们研究了张量力对Li同位素的每个光谱的作用。结果表明,张量力对各个谱中的各个态产生了特征效应,并且这些谱受张量力的影响很大。5Li中最后一个中子的自旋轨道伙伴p1/2和p3/2轨道之间的能量差是由张量关联的相反作用引起的。在6Li中,自旋三重态在LS耦合配置是有利的大力张量力相比,jj耦合壳模型状态。在7,8,9 Li中,由于张量的贡献,在p3/2轨道中含有额外中子的低位态在能量上是有利的,从而允许通过张量力从0 s轨道激发到p1/2轨道。这三个核在其基态表现出不同于~ 6Li的jj耦合特征。

英文摘要:

We study the Li isotopes systematically in terms of the tensor-optimized shell model (TOSM) by using a bare nucleon-nucleon interaction as the AV8' interaction. The short-range correlation is treated in the unitary correlation operator method (UCOM). Using the TOSM+UCOM approach, we investigate the role of the tensor force on each spectrum of the Li isotopes. It is found that the tensor force produces quite a characteristic effect on various states in each spectrum and those spectra are affected considerably by the tensor force. The energy difference between the spin-orbit partner, the p1/2 and p3/2 orbits of the last neutron, in 5Li is caused by opposite roles of the tensor correlation. In 6Li, the spin-triplet state in the LS coupling configuration is favored energetically by the tensor force in comparison with jj coupling shell model states. In 7,8,9Li, the low-lying states containing extra neutrons in the p3/2 orbit are favored energetically due to the large tensor contribution to allow the excitation from the 0s orbit to the p1/2 orbit by the tensor force. Those three nuclei show the jj coupling character in their ground states which is different from 6Li.

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