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arXiv 1505.03751nucl-th
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重N=Z核中的四分位和自旋排列质子-中子对

Quarteting and spin-aligned proton-neutron pairs in heavy N=Z nuclei

M. Sambataro, N. Sandulescu

摘要:

我们分析了重$N=Z$核中最大排列的同位对的作用。四重奏是两个中子和两个质子的叠加,它们与总的同位旋$T=0$和给定的$J$耦合。研究了带有角动量$J=9$的自旋排列对$^{96}$ Cd和$^{92}$ Pd结构的贡献。我们发现,所发挥的作用的$J=9$对模型空间是相当敏感的,特别是,它大大减少通过从简单的$0g_{9/2}$空间传递到更完整的$1p_{1/2}$,$1p_{3/2}$,$0f_{5/2}$,$0g_{9/2}$空间。在后一种情况下,这些原子核的描述中,只有自旋对齐的$J=9$对被证明是不令人满意的,而一个重要的贡献,特别是在基态,被认为是产生从isovector $J=0$和isoscope $J=1$对。因此,与以前的研究相反,我们没有发现令人信服的证据,自旋对齐配对阶段在$^{92}$钯。

英文摘要:

We analyze the role of maximally aligned isoscalar pairs in heavy $N=Z$ nuclei by employing a formalism of quartets. Quartets are superpositions of two neutrons and two protons coupled to total isospin $T=0$ and given $J$. The study is focused on the contribution of spin-aligned pairs carrying the angular momentum $J=9$ to the structure of $^{96}$Cd and $^{92}$Pd. We show that the role played by the $J=9$ pairs is quite sensitive to the model space and, in particular, it decreases considerably by passing from the simple $0g_{9/2}$ space to the more complete $1p_{1/2}$,$1p_{3/2}$,$0f_{5/2}$,$0g_{9/2}$ space. In the latter case the description of these nuclei in terms of only spin-aligned $J=9$ pairs turns out to be unsatisfactory while an important contribution, particularly in the ground state, is seen to arise from isovector $J=0$ and isoscalar $J=1$ pairs. Thus, contrary to previous studies, we find no compelling evidence of a spin-aligned pairing phase in $^{92}$Pd.

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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