A Search for Variations of Fundamental Constants using Atomic Fountain Clocks

Details A Search for Variations of Fundamental Constants using Atomic Fountain Clocks A Search for Variations of Fundamental Constants using Atomic Fountain Clocks

2002-12-31

arxiv.org/abs/physics/0212112v1

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.

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