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

Dong, Kun [Beihang University, Beijing (China)] (ORCID:0009000249768902)·Wu, Yan-song [Beihang University, Beijing (China)] (ORCID:0000000173545915)·Zhang, Guang-xin [Sun Yat-Sen Univ., Guangdong (China)] (ORCID:0000000211123554)·Liu, Meng-lan [Sun Yat-Sen Univ., Guangdong (China); Institute for Basic Science, Daejeon (Korea, Republic of)] (ORCID:0000000180281487)·Huang, Zhen [Soochow University, Suzhou (China)] (ORCID:000000028656694X)·Mengoni, D. [Istituto Nazionale di Fisica Nucleare (INFN), Padova (Italy); Univ. di Padova (Italy)] (ORCID:0000000172192548)·Lv, Hao-bo [Beihang University, Beijing (China)] (ORCID:0009000497895169)·Jiao, Zhen-wei [Beihang University, Beijing (China)]·Hu, Shi-peng [Shenzhen Univ. (China)]·Qu, Wei-wei [Soochow University, Suzhou (China)] (ORCID:0000000345305257)·Li, Cong-bo [China Institute of Atomic Energy, Beijing (China)]·Zheng, Yun [China Institute of Atomic Energy, Beijing (China)] (ORCID:0000000158039731)·Zhang, Huan-qiao [China Institute of Atomic Energy, Beijing (China)]·Yuan, Cen-xi [Sun Yat-Sen Univ., Guangdong (China)] (ORCID:0000000234953614)·Sun, Hui-bin [Shenzhen Univ. (China)]·Wang, Nan [Shenzhen Univ. (China)]·Zhang, Chun-lei [Beijing Normal University, Beijing (China); Beijing Academy of Science and Technology (China)]·Gonçalves, B. R. [Beihang University, Beijing (China)] (ORCID:0000000348744984)·Chen, Jiu-long [Beihang University, Beijing (China)] (ORCID:000900031275394X)·Jiang, Long [Beihang University, Beijing (China)]·Cao, Rui [Beihang University, Beijing (China)] (ORCID:0000000337884332)·Huang, Chen [Beihang University, Beijing (China)] (ORCID:0009000868087946)·Tan, Yuan-ning-zhi [Beihang University, Beijing (China)]·Valiente-Dobón, J. J. [National Inst. of Nuclear Physics (INFN), Legnaro (Italy). National Lab. of Legnaro (INFN-LNL)]·Testov, D. [Univ. di Padova (Italy)] (ORCID:0000000331935311)·Mazzocco, M. [Istituto Nazionale di Fisica Nucleare (INFN), Padova (Italy); Univ. di Padova (Italy)] (ORCID:0000000203410043)·Gozzelino, A. [National Inst. of Nuclear Physics (INFN), Legnaro (Italy). National Lab. of Legnaro (INFN-LNL)] (ORCID:0000000262841126)·Parascandolo, C. [Istituto Nazionale di Fisica Nucleare (INFN), Napoli (Italy)]·Pierroutsakou, D. [Istituto Nazionale di Fisica Nucleare (INFN), Napoli (Italy)] (ORCID:0000000185560338)·La Commara, M. [Istituto Nazionale di Fisica Nucleare (INFN), Napoli (Italy); Univ. di Napoli (Italy)] (ORCID:000000027904094X)·Goasduff, A. [National Inst. of Nuclear Physics (INFN), Legnaro (Italy). National Lab. of Legnaro (INFN-LNL)] (ORCID:0000000334533297)·Bazzacco, D. [Istituto Nazionale di Fisica Nucleare (INFN), Padova (Italy)]·Napoli, D. R. [National Inst. of Nuclear Physics (INFN), Legnaro (Italy). National Lab. of Legnaro (INFN-LNL)] (ORCID:0000000281546958)·Galtarossa, F. [Istituto Nazionale di Fisica Nucleare (INFN), Padova (Italy)] (ORCID:000000016897255X)·Recchia, F. [Istituto Nazionale di Fisica Nucleare (INFN), Padova (Italy); Univ. di Padova (Italy)]·Illana, A. [National Inst. of Nuclear Physics (INFN), Legnaro (Italy). National Lab. of Legnaro (INFN-LNL)] (ORCID:0000000302743388)·Zanon, I. [National Inst. of Nuclear Physics (INFN), Legnaro (Italy). National Lab. of Legnaro (INFN-LNL)] (ORCID:0000000327738702)·Aydin, S. [Tarsus University, Mersin (Turkey)] (ORCID:0000000153801512)·de Angelis, G. [National Inst. of Nuclear Physics (INFN), Legnaro (Italy). National Lab. of Legnaro (INFN-LNL)]·Siciliano, M. [National Inst. of Nuclear Physics (INFN), Legnaro (Italy). National Lab. of Legnaro (INFN-LNL); Argonne National Laboratory (ANL), Lemont, IL (United States). Physics Division] (ORCID:0000000245980298)·Menegazzo, R. [Istituto Nazionale di Fisica Nucleare (INFN), Padova (Italy)] (ORCID:0000000230605276)·Lenzi, S. M. [Istituto Nazionale di Fisica Nucleare (INFN), Padova (Italy); Univ. di Padova (Italy)] (ORCID:0000000246668431)·Zhang, Gao-long [Beihang University, Beijing (China)] (ORCID:0000000346153187)
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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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190 ≤ A ≤ 21973 NUCLEAR PHYSICS AND RADIATION PHYSICSEnergy levelsLifetimes & widthsNuclear structure & decaysShell model

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Dong, Kun [Beihang University, Beijing (China)] (ORCID:0009000249768902), Wu, Yan-song [Beihang University, Beijing (China)] (ORCID:0000000173545915), Zhang, Guang-xin [Sun Yat-Sen Univ., Guangdong (China)] (ORCID:0000000211123554), Liu, Meng-lan [Sun Yat-Sen Univ., Guangdong (China); Institute for Basic Science, Daejeon (Korea, Republic of)] (ORCID:0000000180281487), Huang, Zhen [Soochow University, Suzhou (China)] (ORCID:000000028656694X), Mengoni, D. [Istituto Nazionale di Fisica Nucleare (INFN), Padova (Italy); Univ. di Padova (Italy)] (ORCID:0000000172192548), Lv, Hao-bo [Beihang University, Beijing (China)] (ORCID:0009000497895169), Jiao, Zhen-wei [Beihang University, Beijing (China)], Hu, Shi-peng [Shenzhen Univ. (China)], Qu, Wei-wei [Soochow University, Suzhou (China)] (ORCID:0000000345305257), Li, Cong-bo [China Institute of Atomic Energy, Beijing (China)], Zheng, Yun [China Institute of Atomic Energy, Beijing (China)] (ORCID:0000000158039731), Zhang, Huan-qiao [China Institute of Atomic Energy, Beijing (China)], Yuan, Cen-xi [Sun Yat-Sen Univ., Guangdong (China)] (ORCID:0000000234953614), Sun, Hui-bin [Shenzhen Univ. (China)], Wang, Nan [Shenzhen Univ. (China)], Zhang, Chun-lei [Beijing Normal University, Beijing (China); Beijing Academy of Science and Technology (China)], Gonçalves, B. R. [Beihang University, Beijing (China)] (ORCID:0000000348744984), Chen, Jiu-long [Beihang University, Beijing (China)] (ORCID:000900031275394X), Jiang, Long [Beihang University, Beijing (China)], Cao, Rui [Beihang University, Beijing (China)] (ORCID:0000000337884332), Huang, Chen [Beihang University, Beijing (China)] (ORCID:0009000868087946), Tan, Yuan-ning-zhi [Beihang University, Beijing (China)], Valiente-Dobón, J. J. [National Inst. of Nuclear Physics (INFN), Legnaro (Italy). National Lab. of Legnaro (INFN-LNL)], Testov, D. [Univ. di Padova (Italy)] (ORCID:0000000331935311), Mazzocco, M. [Istituto Nazionale di Fisica Nucleare (INFN), Padova (Italy); Univ. di Padova (Italy)] (ORCID:0000000203410043), Gozzelino, A. [National Inst. of Nuclear Physics (INFN), Legnaro (Italy). National Lab. of Legnaro (INFN-LNL)] (ORCID:0000000262841126), Parascandolo, C. [Istituto Nazionale di Fisica Nucleare (INFN), Napoli (Italy)], Pierroutsakou, D. [Istituto Nazionale di Fisica Nucleare (INFN), Napoli (Italy)] (ORCID:0000000185560338), La Commara, M. [Istituto Nazionale di Fisica Nucleare (INFN), Napoli (Italy); Univ. di Napoli (Italy)] (ORCID:000000027904094X), Goasduff, A. [National Inst. of Nuclear Physics (INFN), Legnaro (Italy). National Lab. of Legnaro (INFN-LNL)] (ORCID:0000000334533297), Bazzacco, D. [Istituto Nazionale di Fisica Nucleare (INFN), Padova (Italy)], Napoli, D. R. [National Inst. of Nuclear Physics (INFN), Legnaro (Italy). National Lab. of Legnaro (INFN-LNL)] (ORCID:0000000281546958), Galtarossa, F. [Istituto Nazionale di Fisica Nucleare (INFN), Padova (Italy)] (ORCID:000000016897255X), Recchia, F. [Istituto Nazionale di Fisica Nucleare (INFN), Padova (Italy); Univ. di Padova (Italy)], Illana, A. [National Inst. of Nuclear Physics (INFN), Legnaro (Italy). National Lab. of Legnaro (INFN-LNL)] (ORCID:0000000302743388), Zanon, I. [National Inst. of Nuclear Physics (INFN), Legnaro (Italy). National Lab. of Legnaro (INFN-LNL)] (ORCID:0000000327738702), Aydin, S. [Tarsus University, Mersin (Turkey)] (ORCID:0000000153801512), de Angelis, G. [National Inst. of Nuclear Physics (INFN), Legnaro (Italy). National Lab. of Legnaro (INFN-LNL)], Siciliano, M. [National Inst. of Nuclear Physics (INFN), Legnaro (Italy). National Lab. of Legnaro (INFN-LNL); Argonne National Laboratory (ANL), Lemont, IL (United States). Physics Division] (ORCID:0000000245980298), Menegazzo, R. [Istituto Nazionale di Fisica Nucleare (INFN), Padova (Italy)] (ORCID:0000000230605276), Lenzi, S. M. [Istituto Nazionale di Fisica Nucleare (INFN), Padova (Italy); Univ. di Padova (Italy)] (ORCID:0000000246668431), Zhang, Gao-long [Beihang University, Beijing (China)] (ORCID:0000000346153187). 2026-04-29. New level scheme and lifetime measurement of the 13/2 + state in 209 Po. https://doi.org/10.1103/nv9n-g5b5

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