Publications (1)0.21 Total impact
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Article: Spectroscopy of the hyperfine structure of antiprotonic 4He and 3He
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ABSTRACT: The spin magnetic moment m[`(p)]s\mu^{\overline{p}}_{s} of the antiproton can be determined by comparing the measured transition frequencies in [`(p)]4\overline{p}^4He + with three-body QED calculations. A comparison between the proton and antiproton can then be used as a test of CPT invariance. The highest measurement precision of the difference between the proton and the antiproton spin magnetic moments to date is 0.3%. A new experimental value of the spin magnetic moment of the antiproton was obtained as m[`(p)]s = -2.7862(83)mN\mu^{\overline{p}}_{s} = -2.7862(83)\mu_{N}, slightly better than the previously best measurement. This agrees with mps\mu^{p}_{s} within 0.24%. In 2009, a new measurement with antiprotonic 3He has been started. A comparison between the theoretical calculations and experimental results would lead to a stronger test of the theory and address systematic errors therein. A measurement of this state will be the first HF measurement on [`(p)]3\overline{p}^3He + . We report here on the new experimental setup and the first tests. KeywordsAntiproton–Antiprotonic helium–Hyperfine structure–Spectroscopy–Laser–Microwave–Three-body quantum electrodynamicsHyperfine Interactions 04/2012; 199(1):337-346. · 0.21 Impact Factor
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2012
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The University of Tokyo
- Department of Physics
Tokyo, Tokyo-to, Japan
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