Seniority Structure in Neutron-Rich Nucleus <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi>Ag</mi></mrow><mprescripts></mprescripts><none></none><mrow><mn>128</mn></mrow></mmultiscripts></mrow></math>: Evidence for Robustness of <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mi>N</mi><mo>=</mo><mn>82</mn></mrow></math> Shell Closure in Silver Isotopes

D. W. Luo; J. Z. Zhang; Z. H. Li; Y. Y. Cheng; H. Hua; H. Watanabe; G. Lorusso; C. X. Yuan; S. Nishimura; H. Baba; G. Benzoni; F. Browne; K. Y. Chae; Z. Q. Chen; F. C. L. Crespi; P. Doornenbal; N. Fukuda; R. Gernhäuser; G. Gey; C. Y. Guo; N. Inabe; T. Isobe; D. X. Jiang; Y. Jin; H. S. Jung; A. Jungclaus; D. Kameda; G. D. Kim; Y. K. Kim; I. Kojouharov; F. G. Kondev; T. Kubo; N. Kurz; Y. K. Kwon; G. J. Lane; X. Q. Li; J. L. Lou; A. Montaner-Pizá; K. Moschner; F. Naqvi; L. Ni; M. Niikura; H. Nishibata; A. Odahara; R. Orlandi; Z. Patel; Zs. Podolyák; H. Sakurai; H. Schaffner; G. S. Simpson; P.-A. Söderström; K. Steiger; T. Sumikama; H. Suzuki; H. Takeda; J. Taprogge; Zs. Vajta; A. Wendt; H. Y. Wu; J. Wu; C. Xu; Z. Y. Xu; A. Yagi; Y. L. Ye; K. Yoshinaga; S. Q. Zhang; S. Y. Zhang; Z. X. Zhou

doi:10.1103/wq9m-trj8

Seniority Structure in Neutron-Rich Nucleus ${}^{128}{Ag}$ : Evidence for Robustness of $N = 82$ Shell Closure in Silver Isotopes

D. W. Luo ¹, J. Z. Zhang ¹, Z. H. Li^1,*, Y. Y. Cheng ^2,†, H. Hua ^1,‡, H. Watanabe^3,4, G. Lorusso^3,5,6, C. X. Yuan ⁷, S. Nishimura ³ et al.

H. Baba³, G. Benzoni ⁸, F. Browne ^3,9, K. Y. Chae ¹⁰, Z. Q. Chen ¹, F. C. L. Crespi ^8,11, P. Doornenbal ³, N. Fukuda³, R. Gernhäuser ¹², G. Gey^3,13,14, C. Y. Guo¹, N. Inabe³, T. Isobe ³, D. X. Jiang¹, Y. Jin ¹, H. S. Jung^15,16, A. Jungclaus¹⁷, D. Kameda³, G. D. Kim ¹⁸, Y. K. Kim^18,19, I. Kojouharov ²⁰, F. G. Kondev ²¹, T. Kubo ³, N. Kurz ²⁰, Y. K. Kwon¹⁸, G. J. Lane ²², X. Q. Li¹, J. L. Lou ¹, A. Montaner-Pizá²³, K. Moschner²⁴, F. Naqvi²⁵, L. Ni ¹, M. Niikura ²⁶, H. Nishibata²⁷, A. Odahara ²⁷, R. Orlandi^28,29, Z. Patel⁶, Zs. Podolyák ⁶, H. Sakurai ³, H. Schaffner²⁰, G. S. Simpson¹³, P.-A. Söderström ³, K. Steiger¹², T. Sumikama³, H. Suzuki³, H. Takeda³, J. Taprogge^3,17,30, Zs. Vajta^3,31, A. Wendt²⁴, H. Y. Wu ¹, J. Wu^1,21, C. Xu¹, Z. Y. Xu^26,32, A. Yagi²⁷, Y. L. Ye ¹, K. Yoshinaga³³, S. Q. Zhang¹, S. Y. Zhang¹, and Z. X. Zhou¹

¹School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
²Department of Physics, East China Normal University, Shanghai 200241, China
³RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
⁴IRCNPC, School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191, China
⁵National Physical Laboratory, NPL, Teddington, Middlesex TW11 0LW, United Kingdom
⁶Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
⁷Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-Sen University, Zhuhai, 519082 Guangdong, China
⁸INFN, Sezione di Milano, via Celoria 16, I-20133 Milano, Italy
⁹School of Computing, Engineering and Mathematics, University of Brighton, Brighton BN2 4GJ, United Kingdom
¹⁰Department of Physics, Sungkyunkwan University, Suwon 440-746, Republic of Korea
¹¹Dipartimento di Fisica, Universitá di Milano, via Celoria 16, I-20133 Milano, Italy
¹²Physik Department, Technische Universität München, D-85748 Garching, Germany
¹³LPSC, Universite Joseph Fourier Grenoble 1, CNRS/IN2P3, Institut National Polytechnique de Grenoble, F-38026 Grenoble Cedex, France
¹⁴Institut Laue-Langevin, B.P. 156, F-38042 Grenoble Cedex 9, France
¹⁵Department of Physics, Chung-Ang University, Seoul 156-756, Republic of Korea
¹⁶Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
¹⁷Instituto de Estructura de la Materia, CSIC, E-28006 Madrid, Spain
¹⁸Rare Isotope Science Project, Institute for Basic Science, Daejeon 305-811, Republic of Korea
¹⁹Department of Nuclear Engineering, Hanyang University, Seoul 133-791, Republic of Korea
²⁰GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
²¹Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
²²Department of Nuclear Physics, R.S.P.E., Australian National University, Canberra, Australian Capital Territory 0200, Australia
²³IFIC, CSIC-Universidad de Valencia, E 46071 Valencia, Spain
²⁴Institut für Kernphysik, Universität zu Kööln, Zülpicher Strasse 77, D-50937 Köln, Germany
²⁵Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06520-8120, USA
²⁶Department of Physics, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, 113-0033 Tokyo, Japan
²⁷Department of Physics, Osaka University, Machikaneyama-machi 1-1, Osaka 560-0043 Toyonaka, Japan
²⁸Instituut voor Kern en Stralingsfysica, KU Leuven, University of Leuven, B-3001 Leuven, Belgium
²⁹Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
³⁰Departamento de Física Teórica, Universidad Autónoma de Madrid, E-28049 Madrid, Spain
³¹MTA Atomki, P.O. Box 51, Debrecen H-4001, Hungary
³²Department of Physics, the University of Hong Kong, Pokfulam Road, Hong Kong
³³Department of Physics, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba, Japan

^*Contact author: zhli@pku.edu.cn
^†Contact author: yycheng@phy.ecnu.edu.cn
^‡Contact author: hhua@pku.edu.cn

PDF

Phys. Rev. Lett. 134, 232502 – Published 12 June, 2025

DOI: https://doi.org/10.1103/wq9m-trj8

Abstract

The spectroscopic studies of very neutron-rich nucleus ${}^{128}{Ag}$ have been performed for the first time at the Radioactive Isotope Beam Factory of RIKEN. A new seniority isomer with a half-life of $1.60 (7) μ s$ has been identified and is proposed to have a spin-parity of $16^{-}$ with a maximally aligned configuration comprising three proton holes in the $g_{9 / 2}$ orbital and one neutron hole in the $h_{11 / 2}$ orbital. The new level structure in ${}^{128}{Ag}$ is quite well described by shell model calculations without invoking excitations across the $Z = 50$ and $N = 82$ shell gaps, and presents a good case of seniority scheme in odd–odd nuclei in the south vicinity of the double-magic nucleus ${}^{132}{Sn}$ . With a classification of various components of the proton–neutron interaction, the inversion of lowest-lying $9^{-}$ and $10^{-}$ states between ${}^{128}{Ag}$ and its neighboring isotone ${}^{130}{In}$ is found to be dynamically ascribed to the seniority-nonconserving proton–neutron interaction components. The structure above $10^{-}$ up to the $16^{-}$ isomer in ${}^{128}{Ag}$ shows remarkable similarities to seniority structures in the semimagic nuclei ${}^{128}{Pd}$ and ${}^{130}{Cd}$ . These spectroscopic features in ${}^{128}{Ag}$ indicate that the $N = 82$ shell closure is still robust in silver isotopes.

Physical Review Letters

Seniority Structure in Neutron-Rich Nucleus ${}^{128}{Ag}$ : Evidence for Robustness of $N = 82$ Shell Closure in Silver Isotopes

Abstract

Physics Subject Headings (PhySH)

Authorization Required

Other Options

References (Subscription Required)

Outline

Information

Filter

Filter

Article Lookup

Enter a citation

Seniority Structure in Neutron-Rich Nucleus Ag128: Evidence for Robustness of N=82 Shell Closure in Silver Isotopes

Abstract

Physics Subject Headings (PhySH)

Authorization Required

Log in via your institution

Log in via APS Member Subscription

Other Options

References (Subscription Required)

Seniority Structure in Neutron-Rich Nucleus ${}^{128}{Ag}$ : Evidence for Robustness of $N = 82$ Shell Closure in Silver Isotopes