First evidence of an octupole rotational band in Ge isotopes

C. G. Wang; R. Han; C. Xu; H. Hua; R. A. Bark; S. Q. Zhang; S. Y. Wang; T. M. Shneidman; S. G. Zhou; J. Meng; S. M. Wyngaardt; A. C. Dai; F. R. Xu; X. Q. Li; Z. H. Li; Y. L. Ye; D. X. Jiang; C. G. Li; C. Y. Niu; Z. Q. Chen; H. Y. Wu; D. W. Luo; S. Wang; D. P. Sun; C. Liu; Z. Q. Li; N. B. Zhang; R. J. Guo; P. Jones; E. A. Lawrie; J. J. Lawrie; J. F. Sharpey-Schafer; M. Wiedeking; S. N. T. Majola; T. D. Bucher; T. Dinoko; B. Maqabuka; L. Makhathini; L. Mdletshe; O. Shirinda; K. Sowazi

doi:10.1103/PhysRevC.106.L011303

Letter

First evidence of an octupole rotational band in Ge isotopes

C. G. Wang^1,2,*, R. Han^3,*, C. Xu^1,†, H. Hua^1,‡, R. A. Bark⁴, S. Q. Zhang¹, S. Y. Wang⁵, T. M. Shneidman^6,7, S. G. Zhou^3,8,9,10 et al.

J. Meng¹, S. M. Wyngaardt¹¹, A. C. Dai¹, F. R. Xu¹, X. Q. Li¹, Z. H. Li¹, Y. L. Ye¹, D. X. Jiang¹, C. G. Li¹, C. Y. Niu¹, Z. Q. Chen¹, H. Y. Wu¹, D. W. Luo¹, S. Wang⁵, D. P. Sun⁵, C. Liu⁵, Z. Q. Li⁵, N. B. Zhang⁵, R. J. Guo⁵, P. Jones⁴, E. A. Lawrie^4,12, J. J. Lawrie⁴, J. F. Sharpey-Schafer¹², M. Wiedeking^4,13, S. N. T. Majola^4,14, T. D. Bucher^4,11, T. Dinoko⁴, B. Maqabuka^4,12, L. Makhathini^4,11, L. Mdletshe^4,15, O. Shirinda⁴, and K. Sowazi⁴

¹School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
²Institude of Advanced Science Facilities, Shenzhen, Guangdong 518107, China
³CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China
⁴iThemba LABS, National Research Foundation, P.O. Box 722, 7129 Somerset West, South Africa
⁵Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai 264209, China
⁶Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Dubna 141980, Russia
⁷Kazan Federal University, Kazan 420008, Russia
⁸School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
⁹Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000, China
¹⁰Synergetic Innovation Center for Quantum Effects and Application, Hunan Normal University, Changsha 410081, China
¹¹Department of Physics, University of Stellenbosch, Matieland 7602, South Africa
¹²Department of Physics, University of the Western Cape, P/B X17 Bellville 7535, South Africa
¹³School of Physics, University of the Witwatersrand, Johannesburg 2050, South Africa
¹⁴Department of Physics, University of Johannesburg, P.O. Box 524, Auckland Park 2006, South Africa
¹⁵Department of Physics, University of Zululand, Private Bag X1001, KwaDlangezwa 3886, South Africa

^*These authors equally contributed to this work.
^†chuan@pku.edu.cn
^‡hhua@pku.edu.cn

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Phys. Rev. C 106, L011303 – Published 20 July, 2022

DOI: https://doi.org/10.1103/PhysRevC.106.L011303

Abstract

The spectroscopy of ${}^{71}{Ge}$ has been investigated via the fusion-evaporation reaction ${}^{74}{Ge} (α, α 3 n) {}^{71}{Ge}$ . Collective structures including a rotational band built on the $15 / 2^{-}$ octupole state in ${}^{71}{Ge}$ have been established. The observation of strong $E 1$ transitions and the well-behaved rotational sequence built on the $15 / 2^{-}$ octupole state provide the first experimental evidence of an octupole rotational band in Ge isotopes, suggesting an enhanced octupole correlation around $N = 40$ in the $A \approx 70$ region. A newly developed semimicroscopic cluster model provides a good description of the octupole characteristics of ${}^{71}{Ge}$ .

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First evidence of an octupole rotational band in Ge isotopes

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First evidence of an octupole rotational band in Ge isotopes

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