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  • Letter

Direct observation of the exotic β−γ−α decay mode in the Tz=−1 nucleus Na20

Y. B. Wang1,*, J. Su2,†, Z. Y. Han1, B. Tang1, B. Q. Cui1, T. Ge1, Y. L. Lyu1, B. A. Brown3,‡, C. X. Yuan4 et al. (BRIF Collaboration)

C. X. Yuan4, L. H. Chen1, Z. Q. Chen5, B. Dai5, B. Guo1, X. Y. Li1, Y. J. Li1, Z. H. Li1, G. Lian1, R. G. Ma1, T. L. Ma1, X. Ma1, Y. J. Ma1, D. Nan1, Y. P. Shen1, Y. Su1, C. G. Wang5, H. Y. Wu5, F. R. Xu5, S. Q. Yan1, S. Zeng1, H. Zhang1, L. Zhang1, Y. Zheng1, C. Zhou6, Y. L. Dang1, G. Y. Fu1, Y. F. He1, F. L. Liu1, D. Wu1, T. J. Zhang1, and W. P. Liu1,§ (BRIF Collaboration)

  • 1China Institute of Atomic Energy, P. O. Box 275(10), Beijing 102413, China
  • 2College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
  • 3Department of Physics and Astronomy, and National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824-1321, USA
  • 4Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-Sen University, Zhuhai 519082, China
  • 5School of Physics, Peking University, Beijing 100871, China
  • 6School of Nuclear Science and Technology, University of South China, Hengyang 421001, China

  • *ybwang@ciae.ac.cn
  • †sujun@bnu.edu.cn
  • ‡brown@nscl.msu.edu
  • §wpliu@ciae.ac.cn
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Phys. Rev. C 103, L011301 – Published 29 January, 2021

DOI: https://doi.org/10.1103/PhysRevC.103.L011301

Abstract

The exotic β−γ−α decay mode of Na20 has been directly observed for the first time in the Day-one experiment at the Beijing Radioactive Ion-beam Facility. The Na20 source was produced by using a 100-MeV proton beam bombarding a stack of microporous MgO thick target and delivered as an intense mass separated beam after online ionization. A high-efficiency simultaneous measurement of β, γ, and α transitions enables the β-delayed γ−γ and α−γ coincidence spectroscopy. Three β−γ−α exotic decay sequences in Na20 are discovered, which expands the rare decay modes observed in β decay. Moreover, a β−α–decay sequence to the 6130-keV 3− state of O16 is observed, which is likely through the 12367-keV 1+ state in Ne20. The experimentally deduced B(F) and B(GT) are compared to the shell-model calculation, the allowed β transition strengths can be well accounted for by using sd shell-model space interactions.

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Phys. Rev. C 103, L011301– Published 29 January, 2021
  • Received 28 May 2020
  • Revised 5 January 2021
  • Accepted 11 January 2021
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