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Hyperfine Interactions

, 194:7 | Cite as

Preliminary results from recent measurements of the antiprotonic helium hyperfine structure

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Abstract

We report on preliminary results from a systematic study of the hyperfine (HF) structure of antiprotonic helium. This precise measurement which was commenced in 2006, has now been completed. Our initial analysis shows no apparent density or power dependence and therefore the results can be averaged. The statistical error of the individual lines is a factor of 60 smaller than that of three body quantum electrodynamic (QED) calculations, while the difference has been resolved to a precision comparable to theory (a factor of 10 better than our first measurement). Agreement between theory and experiment would lead to an increased precision of the measurement for the antiproton magnetic moment and provide a test of CPT invariance.

Keywords

Antiproton Antiprotonic helium Hyperfine structure Spectroscopy Laser Microwave Three-body quantum electrodynamics 

PACS

36.10.k 32.10.Fn 33.40.+f 

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Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  1. 1.Stefan Meyer Institute for Subatomic PhysicsAustrian Academy of SciencesViennaAustria

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