Abstract

The ground-state mass excess of the Tz=βˆ’2T_{z}=-2 drip-line nucleus 22^{22}Al is measured for the first time to be 18103(10)18103(10) keV using the newly-developed Bρ\rho-defined isochronous mass spectrometry method at the cooler storage ring in Lanzhou. The new mass excess value allowed us to determine the excitation energies of the two low-lying 1+1^+ states in 22^{22}Al with significantly reduced uncertainties of 51 keV. Comparing to the analogue states in its mirror nucleus 22^{22}F, the mirror energy differences of the two 1+1^+ states in the 22^{22}Al-22^{22}F mirror pair are determined to be βˆ’625(51)-625(51) keV and βˆ’330(51)-330(51) keV, respectively. The excitation energies and the mirror energy differences are used to test the state-of-the-art \textit{ab initio} valence-space in-medium similarity renormalization group calculations with four sets of interactions derived from the chiral effective field theory. The mechanism leading to the large mirror energy differences is investigated and attributed to the occupation of the Ο€s1/2\pi s_{1/2} orbital.Comment: 8 pages, 5 figure

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