Laser spectroscopy of muonic deuterium

@article{Pohl2016LaserSO,
  title={Laser spectroscopy of muonic deuterium},
  author={R. Pohl and F. Nez and L. Fernandes and F. Amaro and F. Biraben and J. Cardoso and D. Covita and A. Dax and S. Dhawan and M. Diepold and A. Giesen and A. L. Gouvea and T. Graf and T. H{\"a}nsch and P. Indelicato and L. Julien and P. Knowles and F. Kottmann and E. Le Bigot and Yi-Wei Liu and J. Lopes and L. Ludhova and C. Monteiro and F. Mulhauser and T. Nebel and P. Rabinowitz and J. D. dos Santos and L. Schaller and K. Schuhmann and C. Schwob and D. Taqqu and J. Veloso and A. 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… Expand
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