Search for variations of fundamental constants using atomic fountain clocks.

@article{Marion2003SearchFV,
  title={Search for variations of fundamental constants using atomic fountain clocks.},
  author={H. Marion and F Pereira Dos Santos and M. Abgrall and Shiwei Zhang and Yvan Sortais and Sebastien Bize and I. Maksimovic and Davide Calonico and Jan Gr{\"u}nert and C. Mandache and Pierre Lemonde and Giorgio Santarelli and Ph. Laurent and Andr{\'e} Clairon and Christophe Salomon},
  journal={Physical review letters},
  year={2003},
  volume={90 15},
  pages={150801}
}
Over five years, we have compared the hyperfine frequencies of 133Cs and 87Rb atoms in their electronic ground state using several laser-cooled 133Cs and 87Rb atomic fountains with an accuracy of approximately 10(-15). These measurements set a stringent upper bound to a possible fractional time variation of the ratio between the two frequencies: d/dt ln([(nu(Rb))/(nu(Cs))]=(0.2+/-7.0)x 10(-16) yr(-1) (1sigma uncertainty). The same limit applies to a possible variation of the quantity (mu(Rb)/mu… CONTINUE READING
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