I. Ciufolini et al., TESTING DEVIATIONS FROM THE INVERSE SQUARE LAW WITH A FREELY FALLING GRAVITY GRADIOMETER AT BALLOON ALTITUDES, Nuovo cimento della Societa italiana di fisica. C, Geophysics and space physics, 15(6), 1992, pp. 973-982
We discuss a null experiment to search for the fifth force at ranges a
round 10 km. It is proposed to use a three-axis gravity gradiometer to
measure the trace of the Earth gravity tensor from a freely falling e
levator dropped by a balloon. The main error sources are considered to
some extent.