形变晕核$^{31}$Ne中的转动Feshbach共振
Rotational Feshbach resonances in the deformed halo nucleus $^{31}$Ne
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中文总结 AI 辅助
本研究采用粒子转子模型（PRM），阐明了形变晕核$^{31}$Ne中低能连续谱转动Feshbach共振的形成机制，该机制或为弱束缚形变核的普遍特征，需通过符合γ射线的完全破裂测量验证。
中文摘要 AI 辅助
背景：形变晕核$^{31}$Ne因晕中子与$^{30}$Ne核心形变的相互作用呈现出独特结构性质。此前研究已通过反应截面和非完全破裂测量确定了其弱束缚基态的性质，但预计以共振形式出现的低能连续谱激发态结构仍未被充分探索。目的：本研究旨在探究这些共振态的结构，阐明其转动性质与形成机制。方法：采用粒子转子模型（PRM）描述$^{31}$Ne的结构，该模型明确处理了束缚态与连续态中核心激发和单粒子运动之间的耦合。结果：计算预测$^{31}$Ne的低能连续谱中会出现未束缚的转动态，这些态构成了基于弱束缚Nilsson [321 3/2]组态的转动序列。随着转动带总角动量增加，本征Nilsson结构基本得以保留，而主导的核心自旋分量向更高自旋转移。这些共振通过耦合到更高的闭合核心激发道和降低的有效中子相对能量的共同作用而稳定，因此可被解释为转动Feshbach共振。结论：本研究阐明了$^{31}$Ne中转动Feshbach共振的形成机制，该机制预计是弱束缚形变核的普遍特征。对退激核心发出的γ射线进行符合探测的完全破裂测量，将为所提出的转动Feshbach共振形成机制提供关键验证。
英文摘要
Background: The deformed halo nucleus $^{31}$Ne exhibits unique structural properties arising from the interplay between its halo neutron and the deformation of the $^{30}$Ne core. While previous studies have established the nature of its weakly-bound ground state through reaction cross sections and inclusive breakup measurements, the structure of its excited states in the low-energy continuum, which are expected to appear as resonances, remains largely unexplored. Purpose: We investigate the structure of these resonant states and clarify their rotational nature and formation mechanism. Method: The structure of $^{31}$Ne is described using the particle rotor model (PRM), which explicitly treats the coupling between core excitation and single-particle motion in both bound and continuum states. Results: The calculations predict the emergence of unbound rotational states in the low-energy continuum of $^{31}$Ne, which form a rotational sequence built on the weakly-bound Nilsson [321 3/2] configuration. As the total angular momentum increases along the rotational band, the intrinsic Nilsson structure is largely preserved, whereas the dominant core-spin component shifts to higher spins. These resonances are stabilized through the combined effects of coupling to higher-lying closed core-excited channels and reduced effective neutron relative energies, and can therefore be interpreted as rotational Feshbach resonances. Conclusion: The present study elucidates the formation mechanism of rotational Feshbach resonances in $^{31}$Ne. This mechanism is expected to be a general feature of weakly-bound deformed nuclei. Exclusive breakup measurements with coincident detection of $γ$ rays from the de-exciting core will provide crucial tests of the proposed formation mechanism of rotational Feshbach resonances.
发表机构
- National Institute of Technology (KOSEN), Gifu College（岐阜工业高等专门学校）
- RIKEN Nishina Center（理化学研究所仁科加速器中心）
- Department of Physics, Kyushu University（九州大学物理学系）
- Research Center for Nuclear Physics (RCNP), Osaka University（大阪大学核物理研究中心）
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