We have placed a torsion balance (containing two Be and two Cu test bodies) on a hillside to search for intermediate-range forces that couple to baryon number. Our results constrain (at 1{σ}) the strength of such an interaction to be {}{α} ̃ \~{}{}{}{≤}1×{}10^-4 for ranges 250{≤}{λ}{≤}1400 m and {}{α} ̃ \~{}{}{}{≤}1×{}10^-3 for ranges 30<{λ}<250 m.
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Stubbs et al. (1987) studied this question.
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