Format

Send to

Choose Destination
Science. 2007 Jan 5;315(5808):74-7.

Atom interferometer measurement of the newtonian constant of gravity.

Author information

1
Department of Physics, Stanford University, Stanford, CA 94305-4060, USA.

Abstract

We measured the Newtonian constant of gravity, G, using a gravity gradiometer based on atom interferometry. The gradiometer measures the differential acceleration of two samples of laser-cooled Cs atoms. The change in gravitational field along one dimension is measured when a well-characterized Pb mass is displaced. Here, we report a value of G = 6.693 x 10(-11) cubic meters per kilogram second squared, with a standard error of the mean of +/-0.027 x 10(-11) and a systematic error of +/-0.021 x 10(-11) cubic meters per kilogram second squared. The possibility that unknown systematic errors still exist in traditional measurements makes it important to measure G with independent methods.

PMID:
17204644
DOI:
10.1126/science.1135459
Free full text

Supplemental Content

Full text links

Icon for HighWire
Loading ...
Support Center