New level scheme and lifetime measurement of the <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mn>13</mn><mo>/</mo><msup><mn>2</mn><mo>+</mo></msup></mrow></math> state in <math xmlns="http://www.w3.org/1998/Math/MathML"><mmultiscripts><mi>Po</mi><mprescripts></mprescripts><none></none><mn>209</mn></mmultiscripts></math>

Kun Dong; Yan-song Wu; Guang-xin Zhang; Meng-lan Liu; Zhen Huang; D. Mengoni; Hao-bo Lv; Zhen-wei Jiao; Shi-peng Hu; Wei-wei Qu; Cong-bo Li; Yun Zheng; Huan-qiao Zhang; Cen-xi Yuan; Hui-bin Sun; Nan Wang; Chun-lei Zhang; B. R. Gonçalves; Jiu-long Chen; Long Jiang; Rui Cao; Chen Huang; Yuan-ning-zhi Tan; J. J. Valiente-Dobón; D. Testov; M. Mazzocco; A. Gozzelino; C. Parascandolo; D. Pierroutsakou; M. La Commara; A. Goasduff; D. Bazzacco; D. R. Napoli; F. Galtarossa; F. Recchia; A. Illana; I. Zanon; S. Aydin; G. de Angelis; M. Siciliano; R. Menegazzo; S. M. Lenzi; Gao-long Zhang

doi:10.1103/nv9n-g5b5

New level scheme and lifetime measurement of the $13 / 2^{+}$ state in ${}^{209}{Po}$

Kun Dong ^1,*, Yan-song Wu ^1,*, Guang-xin Zhang ^2,†, Meng-lan Liu ^2,3, Zhen Huang ⁴, D. Mengoni ^5,6, Hao-bo Lv ¹, Zhen-wei Jiao¹, Shi-peng Hu^7,8 et al.

Wei-wei Qu ⁴, Cong-bo Li⁹, Yun Zheng ⁹, Huan-qiao Zhang⁹, Cen-xi Yuan ², Hui-bin Sun^7,8, Nan Wang⁷, Chun-lei Zhang^10,11, B. R. Gonçalves ¹, Jiu-long Chen ¹, Long Jiang¹, Rui Cao ¹, Chen Huang ¹, Yuan-ning-zhi Tan¹, J. J. Valiente-Dobón¹², D. Testov ⁶, M. Mazzocco ^5,6, A. Gozzelino ¹², C. Parascandolo¹³, D. Pierroutsakou ¹³, M. La Commara ^13,14, A. Goasduff ¹², D. Bazzacco⁵, D. R. Napoli ¹², F. Galtarossa ⁵, F. Recchia^5,6, A. Illana ¹², I. Zanon ¹², S. Aydin ¹⁵, G. de Angelis¹², M. Siciliano ^12,16, R. Menegazzo ⁵, S. M. Lenzi ^5,6, and Gao-long Zhang ^1,‡

¹School of Physics, Beihang University, Beijing 100191, China
²Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, Guangdong, China
³Center for Exotic Nuclear Studies, Institute for Basic Science, Daejeon 34126, Republic of Korea
⁴State Key Laboratory of Radiation Medicine and Protection, School of Radiation Medicine and Protection, Soochow University, Suzhou 215123, China
⁵INFN, Sezione di Padova, Padova, Italy
⁶Dipartimento di Fisica e Astronomia, Universita di Padova, Padova, Italy
⁷Institute for Advanced Study in Nuclear Energy and Safety, Shenzhen University, Shenzhen 518060, China
⁸Shenzhen Key Laboratory of Research and Manufacture of High Purity Germanium Materials and Detectors, Shenzhen University, Shenzhen 518060, China
⁹China Institute of Atomic Energy, Beijing 102413, China
¹⁰Key Laboratory of Beam Technology of Ministry of Education, School of Physics and Astronomy, Beijing Normal University, Beijing 100875, China
¹¹Key Laboratory of Beam Technology of Ministry of Education, Institute of Radiation Technology, Beijing Academy of Science and Technology, Beijing, China
¹²INFN, Laboratori Nazionali di Legnaro, I-35020 Legnaro, Italy
¹³INFN, Sezione di Napoli, I-80126 Napoli, Italy
¹⁴Dipartimento di Farmacia, Università di Napoli “Federico II”, I-80131 Napoli, Italy
¹⁵Department of Natural and Mathematical Sciences, Faculty of Engineering, Tarsus University, 33480 Mersin, Turkiye
¹⁶Physics Division, Argonne National Laboratory, Lemont, Illinois, USA

^*These authors contributed equally to this work.
^†Contact author: zhanggx37@mail.sysu.edu.cn
^‡Contact author: zgl@buaa.edu.cn

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Phys. Rev. C 113, 044330 – Published 29 April, 2026

DOI: https://doi.org/10.1103/nv9n-g5b5

Abstract

The level structure of ${}^{209}{Po}$ has been studied by in-beam $γ$ -ray spectroscopy with the ${}^{209}{Bi} ({}^{6}{Li}, α 2 n) {}^{209}{Po}$ reaction at beam energies of 28, 30, 34 MeV. The level scheme of ${}^{209}{Po}$ is expanded by the $γ − γ$ coincidence measurement, where 27 new transitions and 23 new levels are observed. The lifetimes of $13 / 2^{-}$ , $17 / 2^{-}$ , and $23 / 2^{+}$ states are obtained and are consistent with the previous work, while the one of the $13 / 2^{+}$ state is measured for the first time. A configuration-interaction-shell-model calculation is performed, and its results are compared with the experimental results for ${}^{209}{Po}$ , with an emphasis on the coupling between the single valence neutron hole and the even-even core of ${}^{210}{Po}$ . A systematic comparison of the $13 / 2^{+}$ state in N = 125 chain is also studied in the current work.

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New level scheme and lifetime measurement of the $13 / 2^{+}$ state in ${}^{209}{Po}$

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New level scheme and lifetime measurement of the 13/2+ state in Po209

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New level scheme and lifetime measurement of the $13 / 2^{+}$ state in ${}^{209}{Po}$