Nuclear Structure of Dripline Nuclei Elucidated through Precision Mass 
Measurements of23Si, 26P, 27;28S, and 31Ar

Yu, Y.; Xing, Y. M.; Zhang, Y. H.; Wang, M.; Zhou, X. H.; Li, J. G.; Li, H. H.; Yuan, Q.; Niu, Y. F.; Huang, Y. N.; Geng, J.; Guo, J. Y.; Chen, J. W.; Pei, J. C.; Xu, F. R.; Litvinov, Yu. A.; Blaum, K.; de Angelis, G.; Tanihata, I.; Yamaguchi, T.; Zhou, X.; Xu, H. S.; Chen, Z. Y.; Chen, R. J.; Deng, H. Y.; Fu, C. Y.; Ge, W. W.; Huang, W. J.; Jiao, H. Y.; Luo, Y. F.; Li, H. F.; Liao, T.; Shi, J. Y.; Si, M.; Sun, M. Z.; Shuai, P.; Tu, X. L.; Wang, Q.; Xu, X.; Yan, X. L.; Yuan, Y. J.; Zhang, M.

doi:10.1103/PhysRevLett.133.222501

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Nuclear Structure of Dripline Nuclei Elucidated through Precision Mass Measurements of ²³Si, ²⁶P, ^27;28S, and ³¹Ar

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Blaum, K.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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https://journals.aps.org/prl/pdf/10.1103/PhysRevLett.133.222501
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Citation

Yu, Y., Xing, Y. M., Zhang, Y. H., Wang, M., Zhou, X. H., Li, J. G., et al. (2024). Nuclear Structure of Dripline Nuclei Elucidated through Precision Mass Measurements of ²³Si, ²⁶P, ^27;28S, and ³¹Ar. Physical Review Letters, 133(7): 222501. doi:10.1103/PhysRevLett.133.222501.

Cite as: https://hdl.handle.net/21.11116/0000-0010-4404-D

Abstract

Using the Bρ-defined isochronous mass spectrometry technique, we report the first determination of the ²³Si, ²⁶P, ²⁷S, and ³¹Ar masses and improve the precision of the ²⁸S mass by a factor of 11. Our measurements confirm that these isotopes are bound and fix the location of the proton dripline in P, S, and Ar. We find that the mirror energy differences of the mirror-nuclei pairs ²⁶P-²⁶Na, ²⁷P-²⁷Mg, ²⁷S-²⁷Na, ²⁸S-²⁸Mg, and ³¹Ar-³¹Al deviate significantly from the values predicted assuming mirror symmetry. In addition, we observe similar anomalies in the excited states, but not in the ground states, of the mirror- nuclei pairs ²²Al-²²F and ²³Al-²³Ne. Using ab initio VS-IMSRG and mean field calculations, we show that such a mirror-symmetry breaking phenomenon can be explained by the extended charge distributions of weakly bound, proton-rich nuclei. When observed, this phenomenon serves as a unique signature that can be valuable for identifying proton-halo candidates.