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|Title:||Determination of the gravitational constant at an effective mass separation of 22 m|
|Authors:||Moore, GI;Stacey, FD;Tuck, GJ;Goodwin, B;Linthorne, NP;Barton, MA;Reid, DM;Agnew, GD|
|Publisher:||American Physical Society|
|Description:||Copyright @ 1988 The American Physical Society|
A vacuum balance that compares the weights of 10-kg stainless-steel masses suspended in evacuated tubes at different levels in a hydroelectric reservoir is being used to measure the gravitational attractions of layers of lake water up to 10 m in depth. The mean effective distance between interacting masses in this experiment is 22 m, making it the largest-scale measurement of G using precisely controlled moving masses. The experiment extends laboratory-type measurements into the range previously explored only by geophysical methods. Assuming purely Newtonian physics the value of the gravitational constant determined from data obtained so far is G=6.689(57)×10-11 m3 kg-1s-2, which agrees with laboratory estimates. The data admit at a 0.6 standard deviation level the parameters of non-Newtonian gravity inferred from geophysical measurements in mines and a tower. These measurements push the estimated ranges of non-Newtonian forces down to a scale accessible to our reservoir experiment, so that experimental improvements now at hand may provide a critical test of non-Newtonian effects.
|Standard no:||Physical Review D 38(4): 1023-1029, Aug 1988|
|Appears in Collections:||Dept of Life Sciences Research Papers|
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