New experimental limits to the time variations of gp(me/mp) and α

Details New experimental limits to the time variations of gp(me/mp) and α New experimental limits to the time variations of gp(me/mp) and α

Oct 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993phrvl..71.2364g&link_type=abstract

Physical Review Letters, Volume 71, Issue 15, October 11, 1993, pp.2364-2366

Astronomy and Astrophysics

Astrophysics

25

Determination Of Fundamental Constants, Protons And Neutrons

Scientific paper

A new experimental limit to the possible time variation of the proton gyromagnetic ratio times the electron-to-proton mass ratio has been obtained from the frequency comparison data between Cs and Mg atomic beam standards. The measurements, made over a period of one year, lead to an upper limit for the rate of change of gp(me/mp) of 5.4×10-3/yr. This result, based only on the validity of the quantum mechanical theory of the atomic spectra, together with astrophysical data regarding analogous products of atomic fundamental constants, leads also to a new limit for the time stability of the fine structure constant α (2.7×10-13/yr).

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