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25 April 2024

» arxiv » physics/0207059

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Hyperfine structure of antiprotonic helium revealed by a laser-microwave-laser resonance method
E. Widmann ; R.S. Hayano ; T. Ishikawa ; J. Sakaguchi ; T. Tasaki ; H. Yamaguchi ; J. Eades ; M. Hori ; H.A. Torii ; B. Juh{ász ; D. Horv{áth ; T. Yamazaki ;
Date:	14 Jul 2002
Journal:	Phys. Rev. Lett. 89 (2002) 243402
Subject:	Atomic Physics \| physics.atom-ph
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 due to 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 $ u_{ ext HF}^+ =12.89596 pm 0.00034$ GHz and $ u_{ ext HF}^- =12.92467 pm 0.00029$ GHz agree with recent theoretical calculations on a level of $ 6 imes10^{-5}$.
Source:	arXiv, physics/0207059
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