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    Octupole correlations, pseudospin partner bands, and γ vibrational band in As75

    C. Liu (刘晨)1,2, W. B. Zeng (曾文彪)1, S. Y. Wang (王守宇)1,2,*, H. Zhang (张惠)1, B. Qi (亓斌)1,2, X. Xiao (肖骁)1, R. A. Bark3, J. Meng (孟杰)4,5,6, S. Q. Zhang (张双全)4 et al.

    H. Hua (华辉)4, P. Jones3, S. M. Wyngaardt6, W. Z. Xu (许文政)1, H. F. Bai (白洪斐)1, S. Wang (王硕)1,2, D. P. Sun (孙大鹏)1,2, Z. Q. Li (李志泉)1,2, H. Jia (贾慧)7, R. J. Guo (郭睿巨)1, X. C. Han (韩星池)8, L. Mu (穆琳)1, X. Lu (陆晓)9, C. Y. Niu (牛晨阳)4, C. G. Wang (王春光)4, E. A. Lawrie3,10, J. J. Lawrie3,10, J. F. Sharpey-Schafer3,10, M. Wiedeking3,11, S. N. T. Majola3,12, T. D. Bucher3,6, T. Dinoko13, B. Maqabuka3,10, L. Makhathini3, L. Mdletshe3,14, N. A. Khumalo3,10, O. Shirinda3,15, and K. Sowazi3

    • 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, Somerset West 7129, South Africa
    • 4School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, People's Republic of China
    • 5School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191, People's Republic of China
    • 6Department of Physics, University of Stellenbosch, Matieland 7602, South Africa
    • 7School of Science, Harbin Institute of Technology, Weihai 264209, People's Republic of China
    • 8Shandong 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
    • 9CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China.
    • 10Physics Department, University of the Western Cape, Private Bag X17, Bellville 7535, South Africa
    • 11School of Physics, University of the Witwatersrand, Johannesburg 2050, South Africa
    • 12Department of Physics, University of Johannesburg, PO Box 524, Auckland Park 2006, South Africa
    • 13Department of Physical and Electrical Metrology, NMISA, Private Bag X34, Lynnwood Ridge, Pretoria 0040, South Africa
    • 14University of Zululand, Private Bag X1001, KwaDlangezwa 3886, South Africa
    • 15Department of Physical and Earth Sciences, Sol Plaatje University, Private Bag X5008, Kimberley 8301, South Africa

    • *Contact author: sywang@sdu.edu.cn
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    Phys. Rev. C 112, 034337 – Published 29 September, 2025

    DOI: https://doi.org/10.1103/rzrx-yh5f

    Abstract

    High spin states in As75 were investigated by using the Ge74(α,p2n) reaction. A total of 27 transitions and 15 levels were newly identified in the level scheme. Based on the experimental characteristics of the observed rotational bands, the positive parity bands 2 and 3 are suggested as a signature partner band and a γ vibrational band of the yrast band 1, respectively. The nearly degenerate negative parity doublet bands 4 and 5 were interpreted as a pair of pseudospin partner bands based on the relativistic density functional theory and the particle plus rotor model calculations. Additionally, evidence of octupole correlations were observed. The present work reports the coexistence of the soft triaxial and soft octupole deformations in atomic nuclei, which shows a diversity of nuclear shapes and collective excitations in this mass region.

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    Phys. Rev. C 112, 034337– Published 29 September, 2025
    • Received 11 March 2025
    • Accepted 3 September 2025
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