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    First observation of pseudospin-chiral triplet bands with pure proton configuration

    W. B. Zeng (曾文彪)1, C. Liu (刘晨)1,2,*, S. Y. Wang (王守宇)1,2,†, B. Qi (亓斌)1,2, R. A. Bark3, H. Jia (贾慧)4, J. Meng (孟杰)5,6,7, S. Q. Zhang (张双全)5, P. Jones3 et al.

    S. M. Wyngaardt7, Q. B. Chen (陈启博)8, Z. Q. Li (李志泉)1,2, S. Wang (王硕)1,2, D. P. Sun (孙大鹏)1,2, R. J. Guo (郭睿巨)1, X. C. Han (韩星池)9, W. Z. Xu (许文政)1, H. Hua (华辉)10, X. Q. Li (李湘庆)10, C. G. Li (李晨光)10, R. Han (韩蕊)10, B. H. Sun (孙保华)6, L. H. Zhu (竺礼华)6, T. D. Bucher3,7, B. V. Kheswa3,7, N. Khumalo3,7,11, E. A. Lawrie3,12, J. J. Lawrie3,12, K. L. Malatji3,12, L. Msebi3,13, J. Ndayishimye3,7, J. F. Sharpey-Schafer3,12, O. Shirinda3,7,14, M. Wiedeking3,15, T. Dinoko16, and S. S. Ntshangase11

    • 1Shandong Provincial Key Laboratory of Nuclear Science, Nuclear Energy Technology and Comprehensive Utilization, Weihai Frontier Innovation Institute of Nuclear Technology, School of Nuclear Science, Energy and Power Engineering, Shandong University, Shandong 250061, People's Republic of China
    • 2WeiHai Research Institute of Industrial Technology, Shandong University, Weihai 264209, People's Republic of China
    • 3iThemba LABS, 7129 Somerset West, South Africa
    • 4School of Science, Harbin Institute of Technology, Weihai, 264209, People's Republic of China
    • 5School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, People's Republic of China
    • 6School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191, People's Republic of China
    • 7Department of Physics, University of Stellenbosch, Matieland 7602, South Africa
    • 8Department of Physics, East China Normal University, Shanghai 200241, People's Republic of China
    • 9Shandong Provincial Key Laboratory of Nuclear Science, Nuclear Energy Technology and Comprehensive Utilization, School of Nuclear Science, Energy and Power Engineering, Shandong University, Shandong 250061, People's Republic of China
    • 10State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, People's Republic of China
    • 11Department of Physics, University of Zululand, Private Bag X1001, KwaDlangezwa 3886, South Africa
    • 12Physics Department, University of the Western Cape, Private Bag X17, Bellville 7535, South Africa
    • 13Department of Physics, University of the Western Cape, P/B X17 Bellville 7535, South Africa
    • 14Department of Physical and Earth Sciences, Sol Plaatje University, Private Bag X5008, Kimberley 8301, South Africa
    • 15School of Physics, University of the Witwatersrand, Johannesburg 2050, South Africa
    • 16Department of Physical and Electrical Metrology, NMISA, Private Bag X34, Lynnwood Ridge, Pretoria 0040, South Africa

    • *Contact author: cliu@sdu.edu.cn
    • †Contact author: sywang@sdu.edu.cn
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    Phys. Rev. C 112, 034330 – Published 23 September, 2025

    DOI: https://doi.org/10.1103/v667-vy2p

    Abstract

    High-spin states of Br81 were populated using the Se82(α,p4n) reaction. One positive-parity band and four negative-parity bands were observed. Based on the experimental characteristics of these bands, a pair of nearly degenerate three-quasiparticle bands with negative parity are interpreted as chiral doublet bands based on the π(f5/2,p3/2)−5πg9/22 configuration. The third three-quasiparticle band is interpreted as a pseudospin partner band, thereby forming pseudospin-chiral triplet bands in Br81. The interpretation was supported by the relativistic density functional theory and the multiparticle plus rotor model calculations. The present work suggests a new chiral configuration in the nuclear system and reports the first observation of pseudospin-chiral triplet bands with a pure proton configuration.

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    Phys. Rev. C 112, 034330– Published 23 September, 2025
    • Received 8 July 2025
    • Revised 15 August 2025
    • Accepted 5 September 2025
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