Hyperfine Structure of Antiprotonic Helium Revealed by a Laser-Microwave-Laser Resonance Method

E. Widmann, J. Eades, T. Ishikawa, J. Sakaguchi, T. Tasaki, H. Yamaguchi, R. S. Hayano, M. Hori, H. A. Torii, B. Juhász, D. Horváth, and T. Yamazaki
Phys. Rev. Lett. 89, 243402 – Published 22 November 2002

Abstract

Using a newly developed laser-microwave-laser resonance method, we observed a pair of microwave transitions between hyperfine levels of the (n,L)=(37,35) state of antiprotonic helium. This experiment confirms the quadruplet hyperfine structure arising from the interaction of the antiproton orbital angular momentum, the electron spin and the antiproton spin as predicted by Bakalov and Korobov. The measured frequencies of νHF+=12.89596±0.00034   GHz and νHF=12.92467±0.00029   GHz agree with recent theoretical calculations on a level of 6×105.

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  • Received 13 July 2002

DOI:https://doi.org/10.1103/PhysRevLett.89.243402

©2002 American Physical Society

Authors & Affiliations

E. Widmann1, J. Eades1, T. Ishikawa1, J. Sakaguchi1, T. Tasaki1, H. Yamaguchi1, R. S. Hayano2,*, M. Hori2, H. A. Torii3, B. Juhász4, D. Horváth5, and T. Yamazaki6

  • 1Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
  • 2CERN, CH-1211 Geneva 23, Switzerland
  • 3Institute of Physics, University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan
  • 4Institute of Nuclear Research of the Hungarian Academy of Sciences, H-4001 Debrecen, Hungary
  • 5KFKI Research Institute for Particle and Nuclear Physics, H-1525 Budapest, Hungary
  • 6RI Beam Science Laboratory, RIKEN, Wako, Saitama 351-0198, Japan

  • *On leave from Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.

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Vol. 89, Iss. 24 — 9 December 2002

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