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Errani, M.
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- PublicationOpen AccessA calibration system for superconducting Gravimeters(1994-10)
; ; ; ; ; ; ; ; ;Achilli, V.; Istituto di Topografia - Università di Bologna - Italy ;Baldi, P.; Dipartimento di Fisica - Settore Geofisica - Università di Bologna - Italy ;Casula, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia ;Errani, M.; INFN - Sezione di Bologna - Italy ;Focardi, S.; Dipartimento di Fisica - Università di Bologna - Italy ;Guerzoni, M.; Dipartimento di Fisica - Settore Geofisica - Università di Bologna - Italy ;Palmonari, F.; Dipartimento di Fisica - Università di Bologna - Italy ;Ragunì, G.; Dipartimento di Fisica - Università di Bologna - Italy; ; ; ; ; ; ; A new method for the calibration of a superconducting gravimeter is described, in wihich a 273 Kg annular mass is placed around the meter and is moved up and down. The geometry of the apparatus is easy to model and the accuracy in the computation of the gravity variation induced by the mass, 6.7 microGal, is limited only by the accuracy in the knowledge of value of the gravitational constant. Measurements done in '91 and '92 for the calibration of the instrument GRW-T015 are described. The calibration factor has been determined with a precision of about 0.3%.308 254 - PublicationRestrictedA geophysical experiment on Newton's inverse-square law(1997-05)
; ; ; ; ; ; ; ;Achilli, V.; DISTART - University of Bologna - Bologna - Italy ;Baldi, P.; Dipartimento di Fisica - Università di Bologna - Italy ;Casula, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia ;Errani, M.; INFN - Sezione di Bologna - Italy ;Focardi, S.; Dipartimento di Fisica - Università di Bologna - Italy ;Palmonari, F.; Dipartimento di Fisica - Università di Bologna - Italy ;Pedrielli, F.; Dipartimento di Fisica - Università di Ferrara - Italy; ; ; ; ; ; A geophysical experiment consisting of the measurements of the gravitational effect produced by a large water mass was performed in order to verify the Newton's law. The use of a superconducting gravimeter, the detailed analysis of the local tidal perturbation, the precise topographic and geological surveys lead to a precision of about 0.1% in the final result. The ratio between the measured and the expected gravitational effect differs from 1 by more than 9 standard deviations. This may be explained by adding to the Newtonian potential a Yukawa repulsive term. The experimental result leads to constraints for the relationship between the relative magnitude (alpha)of the new term and the range (lambda) of the interaction. In the region 20 m < lambda > 500m, alpha ranges from 2.6% to 1.3%.227 26