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Nuclear magnetic moment of the neutron-rich nucleus O21

Y. Ishibashi1,2,*, A. Gladkov1,†, Y. Ichikawa1,‡, A. Takamine1, H. Nishibata1,‡, T. Sato1,§, H. Yamazaki1, T. Abe1, J. M. Daugas3,1,∥ et al.

T. Egami4,1, T. Fujita5,1, G. Georgiev6,¶, K. Imamura7,1, T. Kawaguchi4,1, W. Kobayashi4,1, Y. Nakamura7,1, A. Ozawa2, M. Sanjo4,1, N. Shimizu8,**, D. Tominaga4,1, L. C. Tao9,1, K. Asahi1, and H. Ueno1

  • 1RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
  • 2Institute of Physics, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8571, Japan
  • 3CEA, DAM, DIF, F-91297 Arpajon, France
  • 4Department of Physics, Hosei University, 2-17-1 Fujimi, Chiyoda-ku, Tokyo 102-8160, Japan
  • 5Department of Physics, Osaka University, 1-1 Yamadaoka, Suita, Osaka 656-0871, Japan
  • 6CSNSM, CNRS/IN2P3, Université Paris-sud, F-91405 Orsay, France
  • 7Department of Physics, Meiji University, 1-1-1 Higashi-Mita, Tama, Kawasaki, Kanagawa, 214-8571, Japan
  • 8Center for Nuclear Study, University of Tokyo, Wako Branch at RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
  • 9School of Physics, Peking University, Yiheyuan Road Haidian District, Beijing 100871, China

  • *Present address: Accelerator Engineering Corporation, Konakadai 6-18-1, Inage, Chiba, Chiba 263-0043, Japan.
  • †Corresponding author: aleksey.gladkov@riken.jp
  • ‡Present address: Department of Physics, Kyushu University, 744 Moto-oka, Nishi, Fukuoka 819-0395, Japan.
  • §Present address: Institute of Innovative Research, Tokyo Institute of Technology, 2-12-1 Oh-okayama, Meguro, Tokyo 152-8550, Japan.
  • ∥Present address: Université Paris-Saclay, CEA, CNRS, Inserm, SHFJ, BioMaps, 91401 Orsay, France.
  • Present address: IJCLab, CNRS/IN2P3, Université Paris-Saclay, 91405 Orsay, France.
  • **Present address: Center for Computational Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan.
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Phys. Rev. C 107, 024306 – Published 10 February, 2023

DOI: https://doi.org/10.1103/PhysRevC.107.024306

Abstract

The ground-state magnetic dipole moment of the neutron-rich O21 isotope has been measured via β-ray-detected nuclear magnetic resonance (β−NMR) spectroscopy by using a spin-polarized secondary beam of O21 produced from the Ne22 primary beam. From the present measurement, the g factor |gexp(Og.s.21)|=0.6036(14) has been determined. Based on the comparison of this value with Schmidt values, we unambiguously confirm the νd5/2 configuration with spin and parity assignments Iπ=5/2+ for the O21 ground state, suggested by previously reported studies. Consequently, the magnetic moment has been determined as μexp(Og.s.21)=(−)1.5090(35)μN. The obtained experimental magnetic moment is in good agreement with the predictions of the shell-model calculations using the USD, YSOX, and SDPF-M interactions as well as random phase approximation (RPA) calculations. This observation indicates that the O21 nucleus in its ground state does not manifest any anomalous structure and is not influenced by the proximity of the drip line.

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Phys. Rev. C 107, 024306– Published 10 February, 2023
  • Received 24 August 2022
  • Accepted 29 November 2022
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