发表机构
Institute of Theoretical Physics, Chinese Academy of Sciences; Institute for Advanced Simulation (IAS-4), Forschungszentrum Jülich（中国科学院理论物理研究所; 于利希研究中心高级模拟研究所）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过多参考密度泛函方法，揭示$^{22}$C具有形变两中子晕，物质半径3.29 fm，基态以扁椭球构型为主，$N=16$壳闭合显著减弱。
AI 中文摘要
2010年反应截面测量后十多年，$^{22}$C的结构仍未确定。该原子核位于$N=16$，其中$^{24}$O的球形闭合与$^{20}$C的形变相互竞争。我们开发了一种多参考密度泛函方法，该方法恢复粒子数和角动量，并混合四极形状，同时保留连续谱。计算给出一个形变的两中子晕，物质半径为3.29 fm，更接近碳靶提取值，并具有长的$s$波尾部。基态$0_{1}^{+}$由扁椭球构型主导，其$B(E2)$值与$^{20}$C相当。价中子占据混合的$sd$轨道；在$^{24}$O中建立的$N=16$闭合在$^{22}$C中显著减弱。
英文摘要
The structure of $^{22}$C remains unsettled more than a decade after the 2010 reaction-cross-section measurement. The nucleus sits at $N=16$, where the spherical closure of $^{24}$O competes with the deformation of $^{20}$C. We develop a multi-reference density functional approach that restores particle number and angular momentum and mixes quadrupole shapes while retaining the continuum. The calculation gives a deformed two-neutron halo with matter radius of 3.29 fm, closer to the carbon-target extraction, and a long $s$-wave tail. The ground state $0_{1}^{+}$ is dominated by oblate configurations, with $B(E2)$ values comparable to those of $^{20}$C. The valence neutrons occupy mixed $sd$ orbits; the $N=16$ closure established in $^{24}$O is substantially weakened in $^{22}$C.
Comments6 pages, 4 figures; supplemental materials: 5 pages, 3 figures, 5 tables
