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arXiv 1709.00660nucl-th
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强张量关联下高动量反对称分子动力学与张量优化壳模型的比较

High-momentum antisymmetrized molecular dynamics compared with tensor-optimized shell model for strong tensor correlation

Takayuki Myo, Hiroshi Toki, Kiyomi Ikeda, Hisashi Horiuchi, Tadahiro Suhara, Mengjiao Lyu, Masahiro Isaka, Taiichi Yamada

摘要:

本文讨论了有限核的反对称分子动力学(AMD)中包含核子对大相对动量分量的张量关联。对于方向相反的核子对,张量关联用高斯波包的大虚质心矢量来描述,从而产生大的相对动量。我们将一个核子对在所有方向上具有不同相对动量的AMD基态叠加,这种新方法被称为“高动量AMD”(HM-AMD)。我们显示的结果$^4$他使用有效的相互作用具有很强的张量力。结果发现,HM-AMD提供了一个大的张量矩阵元的张量优化壳模型(TOSM)的情况下,其中的两个粒子,两个空穴(2 p-2 h)激发完全包括来描述张量关联。在$^4$ He的哈密顿分量水平上,两种方法的结果是一致的。这表明在HM-AMD中,核子对虚质心矢量描述的高动量分量对张量关联提供了2 p-2 h激发的等效效应。

英文摘要:

We treat the tensor correlation in antisymmetrized molecular dynamics (AMD) including large-relative-momentum components among nucleon pairs for finite nuclei. The tensor correlation is described by using large imaginary centroid vectors of Gaussian wave packets for nucleon pairs with opposite directions, which makes a large relative momentum. We superpose the AMD basis states, in which one nucleon pair has various relative momenta for all directions; this new method is called "high-momentum AMD" (HM-AMD). We show the results for $^4$He using the effective interaction having a strong tensor force. It is found that HM-AMD provides a large tensor matrix element comparable to the case of the tensor-optimized shell model (TOSM), in which the two-particle-two-hole (2p-2h) excitations are fully included to describe the tensor correlation. The results of two methods agree with each other at the level of the Hamiltonian components of $^4$He. This indicates that in HM-AMD the high-momentum components described by the imaginary centroid vectors of the nucleon pair provide the equivalent effect of the 2p-2h excitations for the tensor correlation.

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