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arXiv 1804.06558nucl-thnucl-ex
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超核形变消失的超平均场研究

Disappearance of nuclear deformation in hypernuclei: a perspective from a beyond-mean-field study

H. Mei, K. Hagino, J. M. Yao, T. Motoba

备注：
6 pages, 5 figures. The version to appear in Phys. Rev. C
发表信息：
Phys. Rev. C 97, 064318 (2018)
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摘要：

在此基础上，对以往的平均场计算[Myaing Thi Win and K. Hagino，Phys.Rev.C { \bf 78}，054311（2008）]已经表明，当将$Λ$颗粒添加到这些核中时，$^{28,30,32}$ Si中的扁扁形变消失。我们在这里调查这一现象，考虑到超出平均场近似的影响。为此，我们采用基于协变密度泛函理论的微观粒子转子模型。我们发现，$^{30}$ Si的变形并没有完全消失，即使它是有点减少，后$Λ$粒子被添加，如果考虑到超越平均场效应。我们还讨论了$Λ$粒子对电四极跃迁的杂质效应，并表明，除了一个$Λ$粒子导致减少的$B(E2)$值，作为一个结果，在变形参数的减少。

英文摘要：

The previous mean-field calculation [Myaing Thi Win and K. Hagino, Phys. Rev. C{\bf 78}, 054311 (2008)] has shown that the oblate deformation in $^{28,30,32}$Si disappears when a $Λ$ particle is added to these nuclei. We here investigate this phenomenon by taking into account the effects beyond the mean-field approximation. To this end, we employ the microscopic particle-rotor model based on the covariant density functional theory. We show that the deformation of $^{30}$Si does not completely disappear, even though it is somewhat reduced, after a $Λ$ particle is added if the beyond-mean-field effect is taken into account. We also discuss the impurity effect of $Λ$ particle on the electric quadrupole transition, and show that an addition of a $Λ$ particle leads to a reduction in the $B(E2)$ value, as a consequence of the reduction in the deformation parameter.

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