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A Search for Variations of Fundamental Constants using Atomic Fountain Clocks

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arxiv physics/0212112 v1 pith:JADV2RWD submitted 2002-12-31 physics.atom-ph astro-phgr-qchep-exhep-ph

A Search for Variations of Fundamental Constants using Atomic Fountain Clocks

H. Marion , F. Pereira Dos Santos , M. Abgrall , S. Zhang , Y. Sortais , S. Bize , I. Maksimovic , D. Calonico
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J. Gruenert C. Mandache P. Lemonde G. Santarelli Ph. Laurent A. Clairon C. Salomon
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classification physics.atom-ph astro-phgr-qchep-exhep-ph
keywords atomicfrequenciespossibleratiovariationaccuracyalphaapplies
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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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