Limits on composition-dependent interactions using a laboratory source: is there a "fifth force" coupled to isospin?
Publication information:
C. W. Stubbs, E. G. Adelberger, B. R. Heckel, W. F. Rogers, H. E. Swanson, R. Watanabe, J. H. Gundlach, and F. J. Raab. 1989. “Limits on Composition-Dependent Interactions Using a Laboratory Source: Is There a ‘fifth Force’ Coupled to Isospin?”. Physical Review Letters, 62, Pp. 609. doi:10.1103/PhysRevLett.62.609
Abstract
Previous "fifth-force" experiments searched for differential acceleration of test bodies placed near terrestrial sources. Because these sources have N≍Z the results had little sensitivity to forces coupled to B-2L = N-Z. The authors searched for such forces by placing a 1 ton Pb source close to a Be/Al torsion balance. No evidence for an isospin-coupled force was found.