First observation of an isomer in <math xmlns="http://www.w3.org/1998/Math/MathML"><mmultiscripts><mi>Es</mi><mprescripts></mprescripts><none></none><mn>243</mn></mmultiscripts></math> via <math xmlns="http://www.w3.org/1998/Math/MathML"><mi>α</mi></math>-decay spectroscopy of <math xmlns="http://www.w3.org/1998/Math/MathML"><mmultiscripts><mi>Md</mi><mprescripts></mprescripts><none></none><mn>247</mn></mmultiscripts></math>

S. Y. Xu; Z. Y. Zhang; Z. G. Gan; F. P. Heßberger; J. G. Wang; M. H. Huang; L. Ma; H. B. Yang; C. L. Yang; M. M. Zhang; Z. Zhao; X. Y. Huang; L. C. Sun; Z. C. Li; G. Xie; H. Zhou; X. Zhang; F. Guan; X. L. Wu; Y. H. Qiang; W. X. Huang; Y. L. Tian; Y. S. Wang; J. Y. Wang; Z. W. Lu; L. T. Sun; Y. He; X. T. He; Z. Z. Ren; S. G. Zhou; V. K. Utyonkov; A. A. Voinov; Yu. S. Tsyganov; A. N. Polyakov; D. I. Solovyev; D. Ibadullayev

doi:10.1103/6ps8-ngl3

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First observation of an isomer in ${}^{243}{Es}$ via $α$ -decay spectroscopy of ${}^{247}{Md}$

S. Y. Xu ^1,2, Z. Y. Zhang ^1,2,*, Z. G. Gan^1,2,3, F. P. Heßberger ^4,5, J. G. Wang ^1,†, M. H. Huang^1,2, L. Ma ¹, H. B. Yang¹, C. L. Yang¹ et al.

M. M. Zhang ¹, Z. Zhao^1,2, X. Y. Huang^1,2, L. C. Sun^1,6, Z. C. Li^1,2, G. Xie^1,2, H. Zhou^1,2, X. Zhang ^1,2, F. Guan^1,6, X. L. Wu¹, Y. H. Qiang¹, W. X. Huang ¹, Y. L. Tian¹, Y. S. Wang¹, J. Y. Wang¹, Z. W. Lu¹, L. T. Sun ^1,2, Y. He ^1,2,3, X. T. He ⁷, Z. Z. Ren⁸, S. G. Zhou ^9,2, V. K. Utyonkov ¹⁰, A. A. Voinov ¹⁰, Yu. S. Tsyganov ¹⁰, A. N. Polyakov ¹⁰, D. I. Solovyev¹⁰, and D. Ibadullayev ^10,11

¹State Key Laboratory of Heavy Ion Science and Technology, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
²School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, China
³Advanced Energy Science and Technology Guangdong Laboratory, Huizhou 516029, China
⁴GSI-Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
⁵Helmholtz Institut Mainz, 55099 Mainz, Germany
⁶Department of Physics, Guangxi Normal University, Guilin 541004, China
⁷College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
⁸School of Physics Science and Engineering, Tongji University, Shanghai 200092, China
⁹Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China
¹⁰Joint Institute for Nuclear Research, Dubna 141980, Russian Federation
¹¹Institute of Nuclear Physics, Almaty 050032, Kazakhstan

^*Contact author: zhangzy@impcas.ac.cn
^†Contact author: wangjg@impcas.ac.cn

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Phys. Rev. C 112, 034315 – Published 12 September, 2025

DOI: https://doi.org/10.1103/6ps8-ngl3

Abstract

The $α$ -decay spectroscopy of ${}^{247}{Md}$ was investigated via the fusion-evaporation reaction ${}^{209}{Bi} ({}^{40}{Ar}, 2 n) {}^{247}{Md}$ by means of $α$ -, $γ$ -, and electron-coincidence measurements. While measuring the previously known $α$ -decay properties, a new isomeric state in ${}^{243}{Es}$ , the daughter nucleus of ${}^{247}{Md}$ , with a half-life of $5.0 (5) µ s$ was observed. Based on the suggested decay scheme of ${}^{247}{Md}$ , the new isomer in ${}^{243}{Es}$ was assigned as the $7 / 2^{+} [633]$ Nilsson level, which is the first observation of an isomer in $Z = 99$ Es isotopes. The single-particle structure around the $Z = 100$ deformed shell gap was discussed.

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First observation of an isomer in ${}^{243}{Es}$ via $α$ -decay spectroscopy of ${}^{247}{Md}$

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First observation of an isomer in Es243 via α-decay spectroscopy of Md247

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First observation of an isomer in ${}^{243}{Es}$ via $α$ -decay spectroscopy of ${}^{247}{Md}$