Hyperfine structure of antiprotonic helium revealed by a laser-microwave-laser resonance method

Details Hyperfine structure of antiprotonic helium revealed by a laser-microwave-laser resonance method Hyperfine structure of antiprotonic helium revealed by a laser-microwave-laser resonance method

2002-07-14

arxiv.org/abs/physics/0207059v1

Phys. Rev. Lett. 89 (2002) 243402

Physics

Atomic Physics

4 pages, 4 figures, 1 table

Scientific paper

10.1103/PhysRevLett.89.243402

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 $\nu_{\text HF}^+ =12.89596 \pm 0.00034$ GHz and $\nu_{\text HF}^- =12.92467 \pm 0.00029$ GHz agree with recent theoretical calculations on a level of $ 6 \times10^{-5}$.

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