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Observation of the near-threshold intruder 0− resonance in Be12

J. Chen1,2, S. M. Wang2, H. T. Fortune3, J. L. Lou1,*, Y. L. Ye1, Z. H. Li1, N. Michel4,5, J. G. Li1, C. X. Yuan6 et al.

Y. C. Ge1, Q. T. Li1, H. Hua1, D. X. Jiang1, X. F. Yang1, D. Y. Pang1, F. R. Xu1, W. Zuo4,5, J. C. Pei1, J. Li1, W. Jiang1, Y. L. Sun1, H. L. Zang1, N. Aoi7, H. J. Ong4,7, E. Ideguchi7, Y. Ayyad7,2, K. Hatanaka7, D. T. Tran7, D. Bazin2, J. Lee8, Y. N. Zhang9, J. Wu1,8, H. N. Liu1,8, C. Wen1,8, T. Yamamoto7, M. Tanaka7, and T. Suzuki7

  • 1School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
  • 2FRIB/NSCL Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
  • 3Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
  • 4Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
  • 5School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, China
  • 6Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-Sen University, Zhuhai, 519082, Guangdong, China
  • 7Research Center for Nuclear Physics, Osaka University, Osaka 567-0047, Japan
  • 8RIKEN (Institute of Physical and Chemical Research), 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
  • 9Department of Physics, Western Michigan University, Kalamazoo, Michigan 49008, USA

  • *jllou@pku.edu.cn

Phys. Rev. C 103, L031302 – Published 17 March, 2021

DOI: https://doi.org/10.1103/PhysRevC.103.L031302

Abstract

A resonant state at 3.21−0.04+0.12MeV, located just above the one-neutron separation threshold, was observed for the first time in Be12 from the Be11(d,p)Be12 one-neutron transfer reaction in inverse kinematics. This state is assigned a spin-parity of 0− according to the systematics of the level scheme of the N=8 isotones and decay-width analysis. Gamow coupled-channel and Gamow shell-model calculations show the importance of the continuum coupling, which dramatically influences the excitation energy and ordering of low-lying states. Various exotic structures associated with cross-shell intruding configurations in Be12 and in its isotonic nucleus Li11 are comparably discussed.

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