Impurity effects of Lambda hyperons on p(Lambda) orbitals
Impurity effects of Lambda hyperons on p(Lambda) orbitals
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Lambda 超子对 p(Lambda) 轨道的杂质影响
DOI：
10.1140/epja/s10050-019-00006-w
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发表时间：
2020
影响因子：
2.7
通讯作者：
Cheng Yi-Yuan
中科院分区：
文献类型：
--
作者：
Fang Bi-Cheng;Li Wen-Yin;Chen Chao-Feng;Cui Ji-Wei;Zhou Xian-Rong;Cheng Yi-Yuan
本文基于变形的Skyrme-Hartree-Fock （DSHF）方法，系统地研究了占据轨道的超子的杂质效应。从轻核质量区到重核质量区，研究了双超核的奇偶核性质。在我们的计算中，Skyrme力SkI4用于thenn相互作用，而对于相互作用，使用了两种密度相关的力，分别是NSC89和SLL4。总的来说，与观测到的结合能相比，skyrme型SLL4相互作用能更好地预测p壳区超核和重核，而微观的NSC89相互作用则适合于sd壳区超核的态和重核。通过对不同构型的密度分布和能量曲线的分析，我们发现，对于轻超核来说，占据轨道的超子使核子的密度更集中在中心，从而减少了核芯的变形。我们还发现，占据两个轨道的超子分别驱动核核的形状向长形侧和扁形侧移动，这是由两个轨道上超子的不同分布造成的。从DSHF计算中提取的b （E2）值也支持这样的结论。然而，对于重超核，由于密度分布的饱和，位于两个超核上的超子在核芯上几乎没有变化。
Based on the deformed Skyrme–Hartree–Fock (DSHF) approach, impurity effects of thehyperons occupyingorbitals are studied systematically in this work. Properties ofand double-hypernuclei with both even and odd numbers of nucleons, from light to heavy nuclear mass regions, are investigated. In our calculation, the Skyrme force, SkI4, is used for theNNinteraction, while, for theinteraction, two kinds of density-dependent forces are used, which are NSC89 and SLL4, respectively. In general, compared to observed binding energies, a Skyrme-type SLL4 interaction gives better predictions for p-shell region hypernuclei and heavy ones, while the microscopic NSC89 interaction is suitable for sd-shell hypernuclei for thestate and thestates. Through analysis of the density distributions and the energy curves of different configurations, we find that thehyperons occupying theorbital,, make the density of nucleons more concentrated at the center and reduce the deformation of the nuclear core for light hypernuclei. It is also found that thehyperons occupying the twoorbitalsanddrive the shapes of nuclear cores toward the prolate side and the oblate side, respectively, which is caused by the different distributions of thehyperons on these two orbitals. TheB(E2) values extracted from the DSHF calculation also support such conclusions. However, for the heavy hypernuclei, hyperons located on bothandmake little change on the nuclear core due to the saturation of its density distribution.