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

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. Shell-model calculations with the state-of-the-art V MU 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 π1g 9/2 orbitals mainly caused by the increasing occupation of ν1h 11/2 orbitals.

Authors:
 [1];  [1];  [1];  [2];  [3];  [1];  [4];  [5];  [5];  [6];  [7];  [8];  [9];  [5];  [5];  [10];  [11];  [5];  [5];  [1] more »;  [12];  [13];  [1];  [5];  [14];  [15];  [16];  [17];  [5];  [18];  [14];  [1];  [1];  [19];  [1];  [1];  [20];  [21];  [1];  [22];  [23];  [24];  [24];  [25];  [26];  [26];  [5];  [5];  [5];  [16];  [27];  [11];  [5];  [28];  [5];  [29];  [30];  [31];  [21];  [1];  [1];  [1];  [1];  [1];  [32];  [24];  [1];  [33] « less
  1. Peking Univ., Beijing (China)
  2. Beihang Univ., Beijing (China); RIKEN, Saitama (Japan)
  3. Sun Yat-Sen Univ., Zhuhai, Guangdong (China)
  4. RIKEN, Saitama (Japan); National Physical Laboratory (NPL), Middlesex (United Kingdom); Univ. of Surrey, Guildford (United Kingdom)
  5. RIKEN, Saitama (Japan)
  6. RIKEN, Saitama (Japan); Univ. of Brighton (United Kingdom)
  7. Istituto Nazionale di Fisica Nucleare (INFN), Milano (Italy)
  8. Sungkyunkwan Univ., Suwon (Korea)
  9. Istituto Nazionale di Fisica Nucleare (INFN), Milano (Italy); Universitá di Milano (Italy)
  10. RIKEN, Saitama (Japan); Univ. Joseph Fourier Grenoble (France). Inst. National Polytechnique de Grenoble, Lab. de Physique Subatomique & Cosmologie (LPSC)
  11. Technische Univ. Munchen, Garching (Germany). Dept. Physik
  12. Consejo Superior de Investigaciones Cientificas (CSIC), Madrid (Spain). Inst. de Estructura de la Materia
  13. Chung-Ang Univ., Seoul (Korea); Univ. of Notre Dame, IN (United States)
  14. Inst. of Basic Science, Daejeon (Korea, Republic of)
  15. Inst. of Basic Science, Daejeon (Korea, Republic of); Hanyang Univ., Seoul (Korea, Republic of). Dept. of Nuclear Engineering
  16. GSI-Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany)
  17. Argonne National Lab. (ANL), Lemont, IL (United States)
  18. Hanyang Univ., Seoul (Korea, Republic of). Dept. of Nuclear Engineering
  19. Australian National Univ., Canberra, ACT (Australia)
  20. Univ. of Valencia (Spain)
  21. Univ. zu Koln (Germany)
  22. Yale Univ., New Haven, CT (United States)
  23. Univ. of Tokyo (Japan)
  24. Osaka Univ. (Japan)
  25. Univ. of Leuven (Belgium); Japan Atomic Energy Agency (JAEA), Tokai (Japan)
  26. Univ. of Surrey, Guildford (United Kingdom)
  27. Univ. Joseph Fourier Grenoble (France). Inst. National Polytechnique de Grenoble, Lab. de Physique Subatomique & Cosmologie (LPSC)
  28. RIKEN, Saitama (Japan); Consejo Superior de Investigaciones Cientificas (CSIC), Madrid (Spain). Inst. de Estructura de la Materia; Autonomous Univ. of Madrid (Spain)
  29. RIKEN, Saitama (Japan); MTA Atomki, Debrecen (Hungary)
  30. Zhoukou Normal Univ., Henan (China)
  31. Peking Univ., Beijing (China); Argonne National Lab. (ANL), Lemont, IL (United States)
  32. Univ. of Tokyo (Japan); Univ. of Hong Kong (China)
  33. Tokyo Univ. of Science, Chiba (Japan)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26); Natural Science Foundation of China; National Research Foundation of Korea (NRF); Spanish Ministerio de Economia y Competitividad
OSTI Identifier:
1526283
Grant/Contract Number:  
AC02-06CH11357; 2018YFA0404403; NRF-2016R1A5A1013277; NRF-2013M7A1A1075764; FPA2017-84756-C4-2-P; 25247045; 17H06090
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 122; Journal Issue: 21; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

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., Podolyák, 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. Proton Shell Evolution below Sn132 : First Measurement of Low-Lying β -Emitting Isomers in Ag123,125. United States: N. p., 2019. Web. doi:10.1103/PhysRevLett.122.212502.
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., Podolyák, 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., & Yoshinaga, K. Proton Shell Evolution below Sn132 : First Measurement of Low-Lying β -Emitting Isomers in Ag123,125. United States. doi:10.1103/PhysRevLett.122.212502.
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., Podolyák, 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. Tue . "Proton Shell Evolution below Sn132 : First Measurement of Low-Lying β -Emitting Isomers in Ag123,125". United States. doi:10.1103/PhysRevLett.122.212502.
@article{osti_1526283,
title = {Proton Shell Evolution below Sn132 : First Measurement of Low-Lying β -Emitting Isomers in Ag123,125},
author = {Chen, Z. Q. and Li, Z. H. and Hua, H. and Watanabe, H. and Yuan, C. X. and Zhang, S. Q. and Lorusso, G. and Nishimura, S. and Baba, H. and Browne, F. and Benzoni, G. and Chae, K. Y. and Crespi, F. C. L. and Doornenbal, P. and Fukuda, N. and Gey, G. and Gernhäuser, R. and Inabe, N. and Isobe, T. and Jiang, D. X. and Jungclaus, A. and Jung, H. S. and Jin, Y. and Kameda, D. and Kim, G. D. and Kim, Y. K. and Kojouharov, I. and Kondev, F. G. and Kubo, T. and Kurz, N. and Kwon, Y. K. and Li, X. Q. and Lou, J. L. and Lane, G. J. and Li, C. G. and Luo, D. W. and Montaner-Pizá, A. and Moschner, K. and Niu, C. Y. and Naqvi, F. and Niikura, M. and Nishibata, H. and Odahara, A. and Orlandi, R. and Patel, Z. and Podolyák, Zs. and Sumikama, T. and Söderström, P. -A. and Sakurai, H. and Schaffner, H. and Simpson, G. S. and Steiger, K. and Suzuki, H. and Taprogge, J. and Takeda, H. and Vajta, Zs. and Wang, H. K. and Wu, J. and Wendt, A. and Wang, C. G. and Wu, H. Y. and Wang, X. and Wu, C. G. and Xu, C. and Xu, Z. Y. and Yagi, A. and Ye, Y. L. and Yoshinaga, K.},
abstractNote = {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. Shell-model 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 ν1h11/2 orbitals.},
doi = {10.1103/PhysRevLett.122.212502},
journal = {Physical Review Letters},
number = 21,
volume = 122,
place = {United States},
year = {2019},
month = {5}
}

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