发表机构
University of South China; Key Laboratory of Advanced Nuclear Energy Design and Safety, Ministry of Education; Guizhou Minzu University; Shanghai Jiao Tong University; Shanghai Key Laboratory for Particle Physics and Cosmology; Lanzhou University; Key Laboratory of Special Function Materials and Structure Design（南华大学; 教育部先进核能设计与安全重点实验室; 贵州民族大学; 上海交通大学; 上海粒子物理与宇宙学重点实验室; 兰州大学; 特殊功能材料与结构设计重点实验室）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究基于相对论Hartree-Fock方法结合TDA，计算奇特原子核的电四极有效电荷，揭示连续态对$E2$跃迁的关键作用，并预言$^{30}$Ne的能级结构特征。
AI 中文摘要
电四极（$E2$）有效电荷基于自洽相对论Hartree-Fock单粒子态进行计算，采用Tamm-Dancoff近似（TDA）对核心极化修正进行全阶求和。采用该TDA有效电荷的组态相互作用相对论Hartree-Fock（CI-RHF）计算，可很好地重现从稳定线到中子滴线的氖同位素的$B(E2)$强度。我们发现，连续态相关的极化电荷因密度分布延展及其与核心的弱耦合而显著淬灭，凸显了连续态效应对奇特原子核$E2$跃迁评估的关键作用。此外，CI-RHF模型预言$^{30}$Ne中$B(E2; 2^+_2 \to 0^+_2)$被抑制，同时转动带的带内$B(E2)$强度很强，表明在$N=20$的“反转岛”内，近球形激发态$0^+_2$与变形基态共存。
英文摘要
Electric quadrupole ($E2$) effective charges are evaluated based on the self-consistent relativistic Hartree-Fock single-particle states, with core-polarization corrections resummed to all orders using the Tamm-Dancoff approximation (TDA). Configuration-interaction relativistic Hartree-Fock (CI-RHF) calculations employing the TDA effective charges well reproduce the $B(E2)$ strength for neon isotopes from stability to the neutron drip line. We find that polarization charges associated with continuum states are significantly quenched due to their extended density distributions and weak coupling to the core, underscoring the critical role of continuum effects in $E2$ transition evaluations for exotic nuclei. Moreover, the CI-RHF model predicts a suppressed $B(E2; 2^+_2 \to 0^+_2)$ in $^{30}$Ne, together with strong in-band $B(E2)$ strengths of the yrast band, suggesting the coexistence of a nearly spherical excited $0^+_2$ state and a deformed ground state within the $N=20$ "island of inversion".
