Laser spectroscopy of muonic deuterium

@article{Pohl2016LaserSO,
  title={Laser spectroscopy of muonic deuterium},
  author={Randolf Pohl and François Nez and Luis M P Fernandes and Fernando Domingues Amaro and Francois Biraben and Jo{\~a}o M. R. Cardoso and Daniel S. Covita and Andreas J Dax and S. K. Dhawan and Marc Diepold and Adolf Giesen and Andrea L. Gouvea and Thomas Graf and Theodor W. H{\"a}nsch and Paul Indelicato and Lucile Julien and Paul E. Knowles and Franz Kottmann and E-O Le Bigot and Yi-Wei Liu and Jos{\'e} A. M. Lopes and Livia Ludhova and Cristina Maria Bernardes Monteiro and Françoise Mulhauser and Tobias Nebel and Paul Rabinowitz and Joaquim Marques Ferreira dos Santos and Lukas A. Schaller and Karsten Schuhmann and Catherine Schwob and David Taqqu and Jo{\~a}o Veloso and Aldo Antognini},
  journal={Science},
  year={2016},
  volume={353},
  pages={669 - 673}
}
The deuteron is too small, too The radius of the proton has remained a point of debate ever since the spectroscopy of muonic hydrogen indicated a large discrepancy from the previously accepted value. Pohl et al. add an important clue for solving this so-called proton radius puzzle. They determined the charge radius of the deuteron, a nucleus consisting of a proton and a neutron, from the transition frequencies in muonic deuterium. Mirroring the proton radius puzzle, the radius of the deuteron… 

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