Z=14 Magicity Revealed by the Mass of the Proton Dripline Nucleus Si 22

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

doi:10.1103/ffwt-n7yc

Z=14 Magicity Revealed by the Mass of the Proton Dripline Nucleus Si 22

Y. M. Xing
, Y. F. Luo
, Y. H. Zhang^*
, M. Wang
, X. H. Zhou
, J. G. Li^*
, K. H. Li
, Q. Yuan
, Y. F. Niu
, J. Y. Guo
, J. C. Pei
, F. R. Xu
, G. De Angelis^*
, Yu A. Litvinov
, K. Blaum
, I. Tanihata
, T. Yamaguchi
, Y. Yu
, X. Zhou
, H. S. Xu

Z. Y. Chen, R. J. Chen, H. Y. Deng, C. Y. Fu, W. W. Ge, W. J. Huang, H. Y. Jiao, H. F. Li, T. Liao, J. Y. Shi, M. Si, M. Z. Sun, P. Shuai, X. L. Tu, Q. Wang, X. Xu, X. L. Yan, Y. J. Yuan, M. Zhang

^*Corresponding author for this work

School of Physics

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

Using the Bρ-defined isochronous mass spectrometry technique, we conducted the first mass measurement of the proton dripline nucleus Si22. We confirm that Si22 is bound against particle emission with Sp/S2p=+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 Si22 exhibits a doubly magic character similar to its mirror partner O22, and that the mirror energy difference of Si22-O22 deviates from the predictions assuming mirror symmetry. Gamow shell-model calculations reveal that the average occupations of valence protons in Si22 are nearly identical to those of valence neutrons in O22, supporting the Z=14 magicity in Si22. The observed mirror-symmetry breaking is attributed to the extended proton distribution in Si22 arising from a small contribution of the unbound π2s1/2 orbital.

Original language	English
Article number	012501
Journal	Physical Review Letters
Volume	135
Issue number	1
DOIs	https://doi.org/10.1103/ffwt-n7yc
State	Published - 2 Jul 2025

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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, Y. A., Blaum, K., Tanihata, I., Yamaguchi, T., Yu, Y., Zhou, X., ... Zhang, M. (2025). Z=14 Magicity Revealed by the Mass of the Proton Dripline Nucleus Si 22. Physical Review Letters, 135(1), Article 012501. https://doi.org/10.1103/ffwt-n7yc

@article{da019f7c657243d4a6cdf2c441e55c2e,

title = "Z=14 Magicity Revealed by the Mass of the Proton Dripline Nucleus Si 22",

abstract = "Using the Bρ-defined isochronous mass spectrometry technique, we conducted the first mass measurement of the proton dripline nucleus Si22. We confirm that Si22 is bound against particle emission with Sp/S2p=+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 Si22 exhibits a doubly magic character similar to its mirror partner O22, and that the mirror energy difference of Si22-O22 deviates from the predictions assuming mirror symmetry. Gamow shell-model calculations reveal that the average occupations of valence protons in Si22 are nearly identical to those of valence neutrons in O22, supporting the Z=14 magicity in Si22. The observed mirror-symmetry breaking is attributed to the extended proton distribution in Si22 arising from a small contribution of the unbound π2s1/2 orbital.",

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

note = "Publisher Copyright: {\textcopyright} 2025 American Physical Society.",

year = "2025",

month = jul,

day = "2",

doi = "10.1103/ffwt-n7yc",

language = "英语",

volume = "135",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "1",

}

Xing, YM, Luo, YF, Zhang, YH, Wang, M, Zhou, XH, Li, JG, Li, KH, Yuan, Q, Niu, YF, Guo, JY, Pei, JC, Xu, FR, De Angelis, G, Litvinov, YA, Blaum, K, Tanihata, I, Yamaguchi, T, Yu, Y, Zhou, X, Xu, HS, Chen, ZY, Chen, RJ, Deng, HY, Fu, CY, Ge, WW, Huang, WJ, Jiao, HY, Li, HF, Liao, T, Shi, JY, Si, M, Sun, MZ, Shuai, P, Tu, XL, Wang, Q, Xu, X, Yan, XL, Yuan, YJ & Zhang, M 2025, 'Z=14 Magicity Revealed by the Mass of the Proton Dripline Nucleus Si 22', Physical Review Letters, vol. 135, no. 1, 012501. https://doi.org/10.1103/ffwt-n7yc

TY - JOUR

T1 - Z=14 Magicity Revealed by the Mass of the Proton Dripline Nucleus Si 22

AU - Xing, Y. M.

AU - Luo, Y. F.

AU - Zhang, Y. H.

AU - Wang, M.

AU - Zhou, X. H.

AU - Li, J. G.

AU - Li, K. H.

AU - Yuan, Q.

AU - Niu, Y. F.

AU - Guo, J. Y.

AU - Pei, J. C.

AU - Xu, F. R.

AU - De Angelis, G.

AU - Litvinov, Yu A.

AU - Blaum, K.

AU - Tanihata, I.

AU - Yamaguchi, T.

AU - Yu, Y.

AU - Zhou, X.

AU - Xu, H. S.

AU - Chen, Z. Y.

AU - Chen, R. J.

AU - Deng, H. Y.

AU - Fu, C. Y.

AU - Ge, W. W.

AU - Huang, W. J.

AU - Jiao, H. Y.

AU - Li, H. F.

AU - Liao, T.

AU - Shi, J. Y.

AU - Si, M.

AU - Sun, M. Z.

AU - Shuai, P.

AU - Tu, X. L.

AU - Wang, Q.

AU - Xu, X.

AU - Yan, X. L.

AU - Yuan, Y. J.

AU - Zhang, M.

PY - 2025/7/2

Y1 - 2025/7/2

N2 - Using the Bρ-defined isochronous mass spectrometry technique, we conducted the first mass measurement of the proton dripline nucleus Si22. We confirm that Si22 is bound against particle emission with Sp/S2p=+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 Si22 exhibits a doubly magic character similar to its mirror partner O22, and that the mirror energy difference of Si22-O22 deviates from the predictions assuming mirror symmetry. Gamow shell-model calculations reveal that the average occupations of valence protons in Si22 are nearly identical to those of valence neutrons in O22, supporting the Z=14 magicity in Si22. The observed mirror-symmetry breaking is attributed to the extended proton distribution in Si22 arising from a small contribution of the unbound π2s1/2 orbital.

AB - Using the Bρ-defined isochronous mass spectrometry technique, we conducted the first mass measurement of the proton dripline nucleus Si22. We confirm that Si22 is bound against particle emission with Sp/S2p=+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 Si22 exhibits a doubly magic character similar to its mirror partner O22, and that the mirror energy difference of Si22-O22 deviates from the predictions assuming mirror symmetry. Gamow shell-model calculations reveal that the average occupations of valence protons in Si22 are nearly identical to those of valence neutrons in O22, supporting the Z=14 magicity in Si22. The observed mirror-symmetry breaking is attributed to the extended proton distribution in Si22 arising from a small contribution of the unbound π2s1/2 orbital.

UR - https://www.scopus.com/pages/publications/105012798519

U2 - 10.1103/ffwt-n7yc

DO - 10.1103/ffwt-n7yc

M3 - 文章

C2 - 40743097

AN - SCOPUS:105012798519

SN - 0031-9007

VL - 135

JO - Physical Review Letters

JF - Physical Review Letters

IS - 1

M1 - 012501

ER -

Z=14 Magicity Revealed by the Mass of the Proton Dripline Nucleus Si 22

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