Search for variations of fundamental constants using atomic fountain clocks.
Phys Rev Lett
; 90(15): 150801, 2003 Apr 18.
Article
em En
| MEDLINE
| ID: mdl-12732023
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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MEDLINE
Idioma:
En
Ano de publicação:
2003
Tipo de documento:
Article