RT Journal Article
SR Electronic
T1 Atom Interferometer Measurement of the Newtonian Constant of Gravity
JF Science
JO Science
FD American Association for the Advancement of Science
SP 74
OP 77
DO 10.1126/science.1135459
VO 315
IS 5808
A1 Fixler, J. B.
A1 Foster, G. T.
A1 McGuirk, J. M.
A1 Kasevich, M. A.
YR 2007
UL http://science.sciencemag.org/content/315/5808/74.abstract
AB 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 × 10–11 cubic meters per kilogram second squared, with a standard error of the mean of ±0.027 × 10–11 and a systematic error of ±0.021 × 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.