Search for Variations of Fundamental Constants using Atomic Fountain Clocks

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18 April 2003

journal article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 90 (15) , 150801
https://doi.org/10.1103/physrevlett.90.150801

Abstract

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(Cs))alpha(-0.44), which involves the ratio of nuclear magnetic moments and the fine structure constant.

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