发表机构
University of South China; Shanghai Jiao Tong University; Lanzhou University（南华大学; 上海交通大学; 兰州大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究用组态相互作用相对论Hartree-Fock模型，揭示B(E2)可作为N=32、34壳层演化的稳健特征，预测了相关核素的B(E2)变化，明确了N=32新幻数的稳健性及N=34壳隙的快速侵蚀。
AI 中文摘要
电四极跃迁概率B(E2)是核壳层演化的关键探针，但奇异核中异常的B(E2)值会干扰新幻数的识别。本文采用组态相互作用相对论Hartree-Fock模型，证明有效电荷对轨道半径敏感，价核子的晕结构会显著放大这种轨道依赖性，该机制对可靠描述E2跃迁、理解奇异核中B(E2)的异常行为至关重要。我们的计算预测52,54Ca中B(E2; 2⁺₁→0⁺₁)值降低，表明N=32和34处出现亚壳闭合；53Sc中B(E2; 7/2⁻₁→11/2⁻₁)跃迁被抑制，凸显N=32这一新幻数的稳健性，而55Sc中增强的跃迁强度则表明，随着质子轨道π1f₇/₂的占据，N=34壳隙正在快速减小。
英文摘要
Electric quadrupole transition probabilities $B(E2)$ serve as key probe of nuclear shell evolution, yet anomalous $B(E2)$ values in exotic nuclei complicate the identification of new magic numbers. In this letter, employing the configuration-interaction relativistic Hartree-Fock model, we demonstrate that effective charges are sensitive to orbital radii, and this orbital dependence is significantly amplified by the halo structure of valence nucleons. This mechanism is critical for reliably describing $E2$ transitions and understanding the unusual behavior of $B(E2)$ in exotic nuclei. Our calculations predict reduced $B(E2; 2^+_1 \rightarrow 0^+_1)$ values in $^{52,54}\text{Ca}$, signaling the emergence of subshell closures at $N=32$ and 34. Furthermore, the suppressed $B(E2; 7/2^{-}_{1} \rightarrow 11/2^{-}_{1})$ transition in $^{53}\text{Sc}$ underscores the robustness of the $N=32$ new magic number, whereas the enhanced transition strength in $^{55}\text{Sc}$ indicates the rapid erosion of the $N=34$ shell gap with the occupancy of the proton orbital $\pi1f_{7/2}$.
