^8He价中子四体重合的证据
Evidence for Quartet Binding of Valence Neutrons in $^8$He
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中文总结 AI 辅助
本研究通过Daejeon16无芯壳模型计算的分波分析和密度累积量，证实^8He的四个价中子存在四体重合，其结合源于^1S_0配对与^3P_2吸引的协同作用。
中文摘要 AI 辅助
多模态中子超流性预测由两个自旋单态s波中子对形成的束缚态四夸克。我们提供证据表明，^8He的四个价中子实现了有限系统的类似情况。四体重合不仅取决于中子-中子吸引的强度，还取决于足够强的吸引对模式的数量和对称性。泡利阻塞限制了同一对结构的重复使用，而额外的模式可提供额外的结合力。对Daejeon16无芯壳模型计算中中子-中子相互作用的分波分析表明，协同^1S_0配对和额外的^3P_2吸引是这种非加性结合的主要中子-中子贡献，而密度累积量则揭示了关联的四中子相关性。
英文摘要
Multimodal neutron superfluidity predicts quartets formed as bound states of two spin-singlet $s$-wave neutron pairs. We present evidence that the four valence neutrons of $^8$He realize the finite-system analogue. Quartet binding depends not only on the strength of neutron-neutron attraction but also on the number and symmetry of sufficiently strong attractive pair modes. Pauli blocking limits reuse of the same pair structure, while additional modes can provide extra binding. A partial-wave analysis of the neutron-neutron interaction in Daejeon16 no-core shell-model calculations identifies cooperative $^1S_0$ pairing and additional $^3P_2$ attraction as the dominant neutron-neutron contributions to this nonadditive binding, while density cumulants reveal connected four-neutron correlations.
