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Proton Shell Evolution below 132Sn: First Measurement of Low-Lying β-Emitting Isomers in 123,125Ag

Chen, Z. Q., Li, Z. H., Hua, H., Watanabe, H., Yuan, C. X., Zhang, S. Q., Lorusso, G., Nishimura, S., Baba, H., Browne, F. , Benzoni, G., Chae, K. Y., Crespi, F. C. L., Doornenbal, P., Fukuda, N., Gey, G., Gernhäuser, R., Inabe, N., Isobe, T., Jiang, D. X., Jungclaus, A., Jung, H. S., Jin, Y., Kameda, D., Kim, G. D., Kim, Y. K., Kojouharov, I., Kondev, F. G., Kubo, T., Kurz, N., Kwon, Y. K., Li, X. Q., Lou, J. L., Lane, G. J., Li, C. G., Luo, D. W., Montaner-Pizá, A., Moschner, K., Niu, C. Y., Naqvi, F., Niikura, M., Nishibata, H., Odahara, A., Orlandi, R., Patel, Z., Podolyak, Zs., Sumikama, T., Söderström, P.-A., Sakurai, H., Schaffner, H., Simpson, G. S., Steiger, K., Suzuki, H., Taprogge, J., Takeda, H., Vajta, Zs., Wang, H. K., Wu, J., Wendt, A., Wang, C. G., Wu, H. Y., Wang, X., Wu, C. G., Xu, C., Xu, Z. Y., Yagi, A., Ye, Y. L. and Yoshinaga, K. (2019) Proton Shell Evolution below 132Sn: First Measurement of Low-Lying β-Emitting Isomers in 123,125Ag Physical Review Letters, 122 (21). 212502-1 - 212502-6.

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Abstract

The β-delayed γ-ray spectroscopy of neutron-rich 123;125Ag isotopes is investigated at the Radioactive Isotope Beam Factory of RIKEN and the long-predicted 1/2¯ β-emitting isomers in 123;125Ag are identified for the first time. With the new experimental results, the systematic trend of energy spacing between the lowest 9/2+ and 1/2¯ levels is extended in Ag isotopes up to N = 78, providing a clear signal for the reduction of the Z = 40 subshell gap in Ag towards N = 82. Shellmodel calculations with the state-of-the-art VMU plus M3Y spin-orbit interaction give a satisfactory description of the low-lying states in 123;125Ag. The tensor force is found to play a crucial role in the evolution of the size of the Z = 40 subshell gap. The observed inversion of the single particle levels around 123Ag can be well interpreted in terms of the monopole shift of the π1g9/2 orbitals mainly caused by the increasing occupation of ʋ1h11/2 orbitals.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
NameEmailORCID
Chen, Z. Q.
Li, Z. H.
Hua, H.
Watanabe, H.
Yuan, C. X.
Zhang, S. Q.
Lorusso, G.
Nishimura, S.
Baba, H.
Browne, F.
Benzoni, G.
Chae, K. Y.
Crespi, F. C. L.
Doornenbal, P.
Fukuda, N.
Gey, G.
Gernhäuser, R.
Inabe, N.
Isobe, T.
Jiang, D. X.
Jungclaus, A.
Jung, H. S.
Jin, Y.
Kameda, D.
Kim, G. D.
Kim, Y. K.
Kojouharov, I.
Kondev, F. G.
Kubo, T.
Kurz, N.
Kwon, Y. K.
Li, X. Q.
Lou, J. L.
Lane, G. J.
Li, C. G.
Luo, D. W.
Montaner-Pizá, A.
Moschner, K.
Niu, C. Y.
Naqvi, F.
Niikura, M.
Nishibata, H.
Odahara, A.
Orlandi, R.
Patel, Z.
Podolyak, Zs.Z.Podolyak@surrey.ac.uk
Sumikama, T.
Söderström, P.-A.
Sakurai, H.
Schaffner, H.
Simpson, G. S.
Steiger, K.
Suzuki, H.
Taprogge, J.
Takeda, H.
Vajta, Zs.
Wang, H. K.
Wu, J.
Wendt, A.
Wang, C. G.
Wu, H. Y.
Wang, X.
Wu, C. G.
Xu, C.
Xu, Z. Y.
Yagi, A.
Ye, Y. L.
Yoshinaga, K.
Date : 27 May 2019
DOI : 10.1103/PhysRevLett.122.212502
Copyright Disclaimer : © 2019 American Physical Society
Depositing User : Clive Harris
Date Deposited : 29 May 2019 11:15
Last Modified : 29 May 2019 11:15
URI: http://epubs.surrey.ac.uk/id/eprint/851907

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