Physics – Atomic Physics
Scientific paper
2002-12-31
Phys.Rev.Lett. 90 (2003) 150801
Physics
Atomic Physics
4 pages, 3 figures, 1 table submitted to Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.90.150801
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 ~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)*10^{-16} yr^{-1} (1 sigma uncertainty). The same limit applies to a possible variation of the quantity (mu_Rb/mu_Cs)*alpha^{-0.44}, which involves the ratio of nuclear magnetic moments and the fine structure constant.
Abgrall Michel
Bize Sébastien
Calonico Davide
Clairon André
Gruenert Jan
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