Novel fast-timing measurement and nature of partial seniority symmetry breaking in <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi>N</mi><mo>=</mo><mn>50</mn></mrow></math> isotones

W. H. Wei; B. S. Cai; G. X. Zhang; C. X. Yuan; C. Qi; G. S. Li; P. C. Ma; K. L. Wang; W. Q. Zhang; H. Huang; K. K. Zheng; Y. D. Fang; J. Gada; X. Y. Fu; S. Dutt; Z. H. Jia; J. H. Li; J. H. Xu; F. F. Zeng; X. G. Wu; J. N. Zou; S. X. Guan; L. W. Yang; J. Z. Li; J. Shi; W. P. Su; W. Q. Yang; Y. N. Zhang; Y. Q. Kong; Y. Y. Huang; C. X. Jia; Z. X. Wang; Q. C. Zhang; Z. L. Meng; S. P. Hu; L. Yang; J. Zhong; T. Q. Li; W. Wang; J. Su; L. Zhu; Y. H. Wei; Y. M. Zhang; B. Mei; X. Fang; C. C. Guo; S. L. Chen; W. Hua; X. P. Zhou; B. H. Sun; X. H. Zhou; R. Lozeva

doi:10.1103/hg78-8hxn

Novel fast-timing measurement and nature of partial seniority symmetry breaking in $N = 50$ isotones

W. H. Wei ^1,*, B. S. Cai ^1,*, G. X. Zhang ^1,†, C. X. Yuan ^1,‡, C. Qi ^2,1,§, G. S. Li ^3,4, P. C. Ma ^3,4, K. L. Wang ^3,4, W. Q. Zhang ^3,4 et al.

H. Huang³, K. K. Zheng³, Y. D. Fang^3,4, J. Gada^3,4, X. Y. Fu^3,4, S. Dutt ^3,4, Z. H. Jia ^3,4, J. H. Li ^3,4, J. H. Xu^3,4, F. F. Zeng ^3,4, X. G. Wu ⁵, J. N. Zou⁵, S. X. Guan⁵, L. W. Yang ⁵, J. Z. Li⁵, J. Shi ⁵, W. P. Su ⁵, W. Q. Yang⁵, Y. N. Zhang¹, Y. Q. Kong¹, Y. Y. Huang ¹, C. X. Jia¹, Z. X. Wang¹, Q. C. Zhang¹, Z. L. Meng ¹, S. P. Hu⁶, L. Yang⁶, J. Zhong⁷, T. Q. Li⁷, W. Wang¹, J. Su¹, L. Zhu¹, Y. H. Wei¹, Y. M. Zhang¹, B. Mei ¹, X. Fang ¹, C. C. Guo¹, S. L. Chen¹, W. Hua^1,8, X. P. Zhou ⁹, B. H. Sun ⁹, X. H. Zhou^3,4, and R. Lozeva ¹⁰

¹Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, China
²Department of Physics, Royal Institute of Technology, Stockholm SE-10691, Sweden
³State Key Laboratory of Heavy Ion Science and Technology, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China
⁴School of Nuclear Science and Technology, University of Chinese Academy of Science, Beijing 100049, China
⁵China Institute of Atomic Energy, Beijing 102413, China
⁶Shenzhen Key Laboratory of Research and Manufacture of High purity Germanium Materials and Detectors, Institute for Advanced Study in Nuclear Energy & Safety, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
⁷College of Engineering Physics, Shenzhen Technology University, Shenzhen 518118, China
⁸Guangxi Key Laboratory of Nuclear Physics and Nuclear Technology, Guangxi Normal University, Guilin 541004, China
⁹School of Physics, Beihang University, Beijing 100191, China
¹⁰Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France

^*These authors contributed equally to this work and should be considered co-first authors.
^†Contact author: zhanggx37@mail.sysu.edu.cn
^‡Contact author: yuancx@mail.sysu.edu.cn
^§Contact author: chongq@kth.se

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Phys. Rev. C 113, 044326 – Published 29 April, 2026

DOI: https://doi.org/10.1103/hg78-8hxn

Abstract

High-precision lifetime measurements of the $4_{1}^{+}$ and $6_{1}^{+}$ states in ${}^{92}{Mo}$ and ${}^{94}{Ru}$ are performed following the ${}^{36}{Ar} + {}^{64}{Zn}$ fusion-evaporation reaction, employing a novel delayed-gated ${LaBr}_{3}$ triple- $γ$ coincidence method. The lifetime of $4_{1}^{+}$ is determined to be 33(5) ps for ${}^{92}{Mo}$ and 70(4) ps for ${}^{94}{Ru}$ , respectively. Our data confirm the anomalous enhancement of $B (E 2; 4^{+} \to 2^{+})$ in ${}^{94}{Ru}$ versus previously known suppression in ${}^{96}{Pd}$ . Shell-model calculation in the $f_{5} p g_{9}$ model space with the monopole-based universal interaction demonstrates that rescaling off-diagonal two-body matrix elements reproduces all the $B (E 2; 4^{+} \to 2^{+})$ strengths without perturbing the others such as $B (E 2; 6^{+} \to 4^{+})$ and $B (E 2; 8^{+} \to 6^{+})$ , identifying the significant influence of cross-orbital off-diagonal matrix elements on $B (E 2)$ strengths as well as the underlying partial seniority symmetry breaking.

Physical Review C

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Novel fast-timing measurement and nature of partial seniority symmetry breaking in $N = 50$ isotones

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Novel fast-timing measurement and nature of partial seniority symmetry breaking in N=50 isotones

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Novel fast-timing measurement and nature of partial seniority symmetry breaking in $N = 50$ isotones