Ground-state mass of $^{22}$Al and test of state-of-the-art \textit{ab initio} calculations

• DOI: 10.48550/arxiv.2401.14704
• Publication Date: 2024-01-26
• Authors: M. Z. Sun; Yongxiong Yu; X. P. Wang; M. Wang; Jiguang Li; Y. H. Zhang; K. Blaum; Zhenglun Chen; R. J. Chen; H. Y. Deng; Chuancheng Fu; Wenwei Ge; W. J. Huang; H. Y. Jiao; Hailing Li; H.F. Li; Yang Luo; Ting Liao; Yu. A. Litvinov; M. Si; P. Shuai; J. Y. Shi; Qinyu Wang; Y. M. Xing; Xiangxiang Xu; Hu Xu; F. R. Xu; Q. Yuan; Takumi Yamaguchi; Xin-Shuai Yan; Jiancheng Yang; Y.J. Yuan; Xianming Zhou; Xianming Zhou; Mingxing Zhang; Q. Zeng

The ground-state mass excess of the $T_{z}=-2$ drip-line nucleus $^{22}$Al is measured for first time to be $18103(10)$ keV using newly-developed B$\rho$-defined isochronous spectrometry method at cooler storage ring in Lanzhou. new value allowed us determine excitation energies two low-lying $1^+$ states with significantly reduced uncertainties 51 keV. Comparing analogue its mirror $^{22}$F, energy differences $^{22}$Al-$^{22}$F pair are determined $-625(51)$ and $-330(51)$ keV, respectively. used test state-of-the-art \textit{ab initio} valence-space in-medium similarity renormalization group calculations four sets interactions derived from chiral effective field theory. mechanism leading large investigated attributed occupation $\pi s_{1/2}$ orbital.