Laser Spectroscopy of Muonic Atoms and Ions

Randolf Pohl , Fran\c{c}ois Nez , Luis M.P. Fernandes , Marwan Abdou Ahmed , Fernando D. Amaro , Pedro Amaro , Fran\c{c}ois Biraben , Jo\~ao M.R. Cardoso

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Daniel S. Covita Andreas Dax Satish Dhawan Marc Diepold Beatrice Franke Sandrine Galtier Adolf Giesen Andrea L. Gouvea Johannes G\"otzfried Thomas Graf Theodor W. H\"ansch Malte Hildebrandt Paul Indelicato Lucile Julien Klaus Kirch Andreas Knecht Paul Knowles Franz Kottmann Julian J. Krauth Eric-Olivier Le Bigot Yi-Wei Liu Jos\'e A.M. Lopes Livia Ludhova Jorge Machado Cristina M.B. Monteiro Fran\c{c}oise Mulhauser Tobias Nebel Paul Rabinowitz Joaquim M.F. dos Santos Jos\'e Paulo Santos Lukas A. Schaller Karsten Schuhmann Catherine Schwob Csilla I. Szabo David Taqqu Jo\~ao F.C.A. Veloso Andreas Voss Birgit Weichelt Aldo Antognini

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classification ⚛️ physics.atom-ph

keywords muonicradiiionslasermuonspectroscopyvaluesatoms

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Laser spectroscopy of the Lamb shift (2S-2P energy difference) in light muonic atoms or ions, in which one negative muon $\mu^-$ is bound to a nucleus, has been performed. The measurements yield significantly improved values of the root-mean-square charge radii of the nuclei, owing to the large muon mass, which results in a vastly increased muon wave function overlap with the nucleus. The values of the proton and deuteron radii are 10 and 3 times more accurate than the respective CODATA values, but 7 standard deviations smaller. Data on muonic helium-3 and -4 ions is being analyzed and will give new insights. In future, the (magnetic) Zemach radii of the proton and the helium-3 nuclei will be determined from laser spectroscopy of the 1S hyperfine splittings, and the Lamb shifts of muonic Li, Be and B can be used to improve the respective charge radii.

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Laser Spectroscopy of Muonic Atoms and Ions

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