The interaction of spins in a spin-polarized test mass and those in a paramagentic salt, separated by a {μ}-metal shield and a double-layer superconducting shield, was investigated. Our results set a limit on electron spin interactions and on moments which are not of electromagnetic origin. In terms of a standard dipole-dipole form, the limit is (2.7±{}2.4)×{}10^-14 of the interaction strength between the magnetic moments of the electrons. Compared to previous results, this is more than a twentyfold improvement.
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Chui et al. (1993) studied this question.
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