Article

A Measurement of Newton's Gravitational Constant

Institute for Geophysics, University of Zurich, Zürich, Zurich, Switzerland
Physical Review D (Impact Factor: 4.86). 10/2006; 74(8). DOI: 10.1103/PHYSREVD.74.082001
Source: arXiv

ABSTRACT A precision measurement of the gravitational constant $G$ has been made using a beam balance. Special attention has been given to determining the calibration, the effect of a possible nonlinearity of the balance and the zero-point variation of the balance. The equipment, the measurements and the analysis are described in detail. The value obtained for G is 6.674252(109)(54) 10^{-11} m3 kg-1 s-2. The relative statistical and systematic uncertainties of this result are 16.3 10^{-6} and 8.1 10^{-6}, respectively.

Full-text

Available from: Stephan Schlamminger, Apr 19, 2014
0 Followers
 · 
136 Views
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Many precision measurements of G have produced a spread of results incompatible with measurement errors. Clearly an unknown source of systematic errors is at work. It is proposed here that most of the discrepancies derive from subtle deviations from Hooke's law, caused by avalanches of entangled dislocations. The idea is supported by deviations from linearity reported by experimenters measuring G, similar to what observed, on a larger scale, in low-frequency spring oscillators. Some mitigating experimental apparatus modifications are suggested.
    Physics Letters A 09/2014; 379(18-19). DOI:10.1016/j.physleta.2015.02.032 · 1.63 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Lorentz force velocimetry (LFV) is a noncontact electromagnetic flow measurement technique for liquid metals that is currently used in fundamental research and metallurgy. Up to now, the application of LFV was limited to the narrow class of liquids whose electrical conductivity is of the order 10+6 S/m. Here, we demonstrate that LFV can be applied to liquids with conductivities up to six orders of magnitude smaller than in liquid metals. We further argue that this range can be extended to 10-3 S/m under industrial and to 10-6 S/m under laboratory conditions making LFV applicable to most liquids of practical interest.
    Applied Physics Letters 05/2012; 1000(194103). DOI:10.1063/1.4714899 · 3.52 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Two independent measurements of the Newtonian gravitational constant G, with stated relative uncertainties below 20 ppm, have been reported in the literature. These measurements were carried out at significantly different separations between source and test masses. The close agreement between the two reported values is used to derive constraints on the existence of a single, composition-independent Yukawa interaction at intermediate ranges. These inferred limits are tighter than those obtained through direct search, for ranges between about 2 cm and 1 m. At a range of 10 cm, the improvement is by a factor of approximately 50.
    Physical review D: Particles and fields 06/2008; 77(12):122001-122001. DOI:10.1103/PHYSREVD.77.122001 · 4.86 Impact Factor