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$Z=14$ Magicity Revealed by the Mass of the Proton Dripline Nucleus $^{22}$Si

Fuente: arXiv

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Bibliographic Details
Main Authors:	Xing, Y. M., Luo, Y. F., Zhang, Y. H., Wang, M., Zhou, X. H., Li, J. G., Li, K. H., Yuan, Q., Niu, Y. F., Guo, J. Y., Pei, J. C., Xu, F. R., de Angelis, G., Litvinov, Yu. A., Blaum, K., Tanihata, I., Yamaguchi, T., Yu, Y., 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., 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.
Format:	Preprint
Published:	2025
Subjects:	Nuclear Experiment Nuclear Theory
Online Access:	Acceder al recurso
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_version_	1866909521405804544
author	Xing, Y. M. Luo, Y. F. Zhang, Y. H. Wang, M. Zhou, X. H. Li, J. G. Li, K. H. Yuan, Q. Niu, Y. F. Guo, J. Y. Pei, J. C. Xu, F. R. de Angelis, G. Litvinov, Yu. A. Blaum, K. Tanihata, I. Yamaguchi, T. Yu, Y. 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. 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.
author_facet	Xing, Y. M. Luo, Y. F. Zhang, Y. H. Wang, M. Zhou, X. H. Li, J. G. Li, K. H. Yuan, Q. Niu, Y. F. Guo, J. Y. Pei, J. C. Xu, F. R. de Angelis, G. Litvinov, Yu. A. Blaum, K. Tanihata, I. Yamaguchi, T. Yu, Y. 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. 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.
contents	Using the $Bρ$-defined isochronous mass spectrometry technique, we conducted the first mass measurement of the proton dripline nucleus $^{22}$Si. We confirm that $^{22}$Si is bound against particle emission with $S_p/S_{2p}=+1412(114)/+229(54)$ keV, fixing the proton dripline location for the Si element. By analyzing the mass differences of the neighboring $sd$-shell nuclei, we find that $^{22}$Si exhibits a doubly-magic character similar to its mirror partner $^{22}$O, and that the mirror energy difference of $^{22}$Si-$^{22}$O deviates from the predictions assuming mirror symmetry. Gamow shell-model calculations reveal that the average occupations of valence protons in $^{22}$Si are nearly identical to those of valence neutrons in $^{22}$O, supporting the $Z=14$ magicity in $^{22}$Si. The observed mirror-symmetry breaking is attributed to the extended proton distribution in $^{22}$Si arising from a small contribution of the unbound $\pi2s_{1/2}$ orbital.
format	Preprint
id	arxiv_https___arxiv_org_abs_2503_01380
institution	arXiv
publishDate	2025
record_format	arxiv
spellingShingle	$Z=14$ Magicity Revealed by the Mass of the Proton Dripline Nucleus $^{22}$Si Xing, Y. M. Luo, Y. F. Zhang, Y. H. Wang, M. Zhou, X. H. Li, J. G. Li, K. H. Yuan, Q. Niu, Y. F. Guo, J. Y. Pei, J. C. Xu, F. R. de Angelis, G. Litvinov, Yu. A. Blaum, K. Tanihata, I. Yamaguchi, T. Yu, Y. 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. 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. Nuclear Experiment Nuclear Theory Using the $Bρ$-defined isochronous mass spectrometry technique, we conducted the first mass measurement of the proton dripline nucleus $^{22}$Si. We confirm that $^{22}$Si is bound against particle emission with $S_p/S_{2p}=+1412(114)/+229(54)$ keV, fixing the proton dripline location for the Si element. By analyzing the mass differences of the neighboring $sd$-shell nuclei, we find that $^{22}$Si exhibits a doubly-magic character similar to its mirror partner $^{22}$O, and that the mirror energy difference of $^{22}$Si-$^{22}$O deviates from the predictions assuming mirror symmetry. Gamow shell-model calculations reveal that the average occupations of valence protons in $^{22}$Si are nearly identical to those of valence neutrons in $^{22}$O, supporting the $Z=14$ magicity in $^{22}$Si. The observed mirror-symmetry breaking is attributed to the extended proton distribution in $^{22}$Si arising from a small contribution of the unbound $\pi2s_{1/2}$ orbital.
title	$Z=14$ Magicity Revealed by the Mass of the Proton Dripline Nucleus $^{22}$Si
topic	Nuclear Experiment Nuclear Theory
url	https://arxiv.org/abs/2503.01380