Conversion electron spectroscopy unveils internal transition pathways of isomers in the neutron-deficient nuclei <math xmlns="http://www.w3.org/1998/Math/MathML"><mmultiscripts><mi>Hg</mi><mprescripts></mprescripts><none></none><mrow><mn>179</mn><mo>,</mo><mn>181</mn></mrow></mmultiscripts></math> and <math xmlns="http://www.w3.org/1998/Math/MathML"><mmultiscripts><mi>Tl</mi><mprescripts></mprescripts><none></none><mn>179</mn></mmultiscripts></math>

S. Y. Zhang; H. Huang; H. Y. Wu; C. Y. Guo; D. W. Luo; L. Ni; Z. H. Li; A. N. Andreyev; Z. Liu; H. Hua; D. X. Wang; A. Barzakh; Z. X. Zhou; S. Antalic; B. Andel; A. Sitarčík; J. Z. Zhang; Y. X. Ren; J. Y. Yi; J. F. Wang; W. J. Pan; W. Q. Zhang; Q. B. Zeng; Z. G. Gan; Z. Y. Zhang; M. H. Huang; H. B. Yang; L. Ma; J. G. Wang; M. M. Zhang

doi:10.1103/ggc8-mn83

Conversion electron spectroscopy unveils internal transition pathways of isomers in the neutron-deficient nuclei ${}^{179, 181}{Hg}$ and ${}^{179}{Tl}$

S. Y. Zhang ¹, H. Huang ^2,3, H. Y. Wu ^4,1, C. Y. Guo¹, D. W. Luo¹, L. Ni ¹, Z. H. Li^1,*, A. N. Andreyev ^5,6,†, Z. Liu ^2,3 et al.

H. Hua ¹, D. X. Wang¹, A. Barzakh ⁷, Z. X. Zhou¹, S. Antalic ⁸, B. Andel ⁸, A. Sitarčík⁸, J. Z. Zhang¹, Y. X. Ren¹, J. Y. Yi ¹, J. F. Wang¹, W. J. Pan¹, W. Q. Zhang ^2,3, Q. B. Zeng^2,3, Z. G. Gan^2,3, Z. Y. Zhang ^2,3, M. H. Huang^2,3, H. B. Yang^2,3, L. Ma ^2,3, J. G. Wang ^2,3, and M. M. Zhang^2,3

¹School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
²Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
³University of Chinese Academy of Sciences, Beijing 100049, China
⁴Key Laboratory of Nuclear Data, China Institute of Atomic Energy, Beijing 102413, China
⁵School of Physics, Engineering and Technology, University of York, York YO10 5DD, United Kingdom
⁶Advanced Science Research Center, Japan Atomic Energy Agency, Tokai-mura, Ibaraki 319-1195, Japan
⁷Petersburg Nuclear Physics Institute, NRC Kurchatov Institute, Gatchina 188300, Russia
⁸Department of Nuclear Physics and Biophysics, Comenius University in Bratislava, 84248 Bratislava, Slovakia

^*Contact author: zhli@pku.edu.cn
^†Contact author: andrei.andreyev@york.ac.uk

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Phys. Rev. C 114, 014325 – Published 20 July, 2026

DOI: https://doi.org/10.1103/ggc8-mn83

Abstract

The isomers in the very neutron-deficient isotopes ${}^{179 m, 181 m}{Hg}$ and ${}^{179 m}{Tl}$ were populated via fusion-evaporation reaction ${}^{78}{Kr} + {}^{107}{Ag} \to {}^{185}{Bi}^{*}$ . Using the gas-filled recoil separator SHANS (Lanzhou), the nuclei of interest were efficiently transported and separated from scattered beam particles and unwanted reaction products. In this study, conversion electrons (CEs) associated with isomeric transitions (ITs) of these isomers were observed for the first time. The CE- $α$ correlation measurements provided crucial insights into their decay properties. For ${}^{179 m}{Tl}$ , a previously unknown IT branch was identified, and a tentative IT decay scheme was proposed. For ${}^{179 m, 181 m}{Hg}$ , the analysis of CEs served to validate and update their IT decay pathways.

Physical Review C

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Conversion electron spectroscopy unveils internal transition pathways of isomers in the neutron-deficient nuclei ${}^{179, 181}{Hg}$ and ${}^{179}{Tl}$

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Conversion electron spectroscopy unveils internal transition pathways of isomers in the neutron-deficient nuclei Hg179,181 and Tl179

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Conversion electron spectroscopy unveils internal transition pathways of isomers in the neutron-deficient nuclei ${}^{179, 181}{Hg}$ and ${}^{179}{Tl}$