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Phys. Rev. Lett. 89, 243402 (2002) [4 pages]

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

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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

Received 13 July 2002; published 22 November 2002

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+=12.895 96±0.000 34   GHz and νHF-=12.924 67±0.000 29   GHz agree with recent theoretical calculations on a level of 6×10-5.

© 2002 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.89.243402
DOI:
10.1103/PhysRevLett.89.243402
PACS:
36.10.–k, 32.10.Fn, 33.40.+f

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

 
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