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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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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 :
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.
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

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