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 dG/G <10^−4.
Source mass and positioning system for an accurate measurement of G / G. Lamporesi; A. Bertoldi; A. Cecchetti; B. Duhlach; M. Fattori; A. Malengo; S. Pettorruso; M. Prevedelli; G. M. Tino. - In: REVIEW OF SCIENTIFIC INSTRUMENTS. - ISSN 0034-6748. - STAMPA. - 78:(2007), pp. 075109-1-075109-7. [10.1063/1.2751090]
Source mass and positioning system for an accurate measurement of G
PREVEDELLI, MARCO;
2007
Abstract
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 dG/G <10^−4.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
