First observation of an isomer in 243Es via α-decay spectroscopy of 247Md
Xu S.Y. Zhang Z.Y. Gan Z.G. Heßberger F.P. Wang J.G. Huang M.H. Ma L. Yang H.B. Yang C.L. Zhang M.M. Zhao Z. Huang X.Y. Sun L.C. Li Z.C. Xie G. Zhou H. Zhang X. Guan F. Wu X.L. Qiang Y.H. Huang W.X. Tian Y.L. Wang Y.S. Wang J.Y. Lu Z.W. Sun L.T. He Y. He X.T. Ren Z.Z. Zhou S.G. Utyonkov V.K. Voinov A.A. Tsyganov Yu.S. Polyakov A.N. Solovyev D.I. Ibadullayev D.
12 September 2025American Physical Society
Physical Review C
2025#112Issue 3
The α-decay spectroscopy of 247Md was investigated via the fusion-evaporation reaction 209Bi(40Ar, 2n) 247Md by means of α-, γ -, and electron-coincidence measurements. While measuring the previously known α-decay properties, a new isomeric state in 243Es, the daughter nucleus of 247Md, with a half-life of 5.0(5) μs was observed. Based on the suggested decay scheme of 247Md, the new isomer in 243Es 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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State Key Laboratory of Heavy Ion Science and Technology, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, China
School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing, 100049, China
Advanced Energy Science and Technology Guangdong Laboratory, Huizhou, 516029, China
GSI-Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, 64291, Germany
Helmholtz Institut Mainz, Mainz, 55099, Germany
Department of Physics, Guangxi Normal University, Guilin, 541004, China
College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China
School of Physics Science and Engineering, Tongji University, Shanghai, 200092, China
Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing, 100190, China
Joint Institute for Nuclear Research, Dubna, 141980, Russian Federation
Institute of Nuclear Physics, Almaty, 050032, Kazakhstan
State Key Laboratory of Heavy Ion Science and Technology
School of Nuclear Science and Technology
Advanced Energy Science and Technology Guangdong Laboratory
GSI-Helmholtzzentrum für Schwerionenforschung GmbH
Helmholtz Institut Mainz
Department of Physics
College of Materials Science and Technology
School of Physics Science and Engineering
Institute of Theoretical Physics
Joint Institute for Nuclear Research
Institute of Nuclear Physics
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