Source mass and positioning system for an accurate measurement of G

We report on a system of well-characterized source masses and their precision positioning system for a measurement of the Newtonian gravitational constant G using atoms as probes. The masses are 24 cylinders of 50 mm nominal radius, 150.2 mm nominal height, and mass of about 21.5 kg , sintered start...

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Bibliographic Details
Published in:Review of scientific instruments 2007-07, Vol.78 (7), p.075109-075109-7
Main Authors: Lamporesi, G., Bertoldi, A., Cecchetti, A., Duhlach, B., Fattori, M., Malengo, A., Pettorruso, S., Prevedelli, M., Tino, G. M.
Format: Article
Language:English
Subjects:
ACCURACY
Calibration - standards
COPPER ALLOYS
CYLINDERS
CYLINDRICAL CONFIGURATION
DENSITY
Equipment Design
Equipment Failure Analysis
GEOMETRY
Gravitation
HEIGHT
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
Internationality
MASS
Micromanipulation - instrumentation
Micromanipulation - methods
MIXTURES
NICKEL ALLOYS
POSITIONING
PROBES
Reference Values
Reproducibility of Results
RESOLUTION
Sensitivity and Specificity
SINTERING
TUNGSTEN ALLOYS
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Summary:We report on a system of well-characterized source masses and their precision positioning system for a measurement of the Newtonian gravitational constant G using atoms as probes. The masses are 24 cylinders of 50 mm nominal radius, 150.2 mm nominal height, and mass of about 21.5 kg , sintered starting from a mixture of 95.3% W, 3.2% Ni, and 1.5% Cu. Density homogeneity and cylindrical geometry have been carefully investigated. The positioning system independently moves two groups of 12 cylinders along the vertical direction by tens of centimeters with a reproducibility of a few microns. The whole system is compatible with a resolution Δ G ∕ G < 10 − 4 .
ISSN:0034-6748
1089-7623
DOI:10.1063/1.2751090