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VOLUME 91 | ISSUE 1 | PAGE 8
Search for macroscopic CP violating forces using a neutron EDM spectrometer
Abstract
The search for CP violating forces between nucleons in the so-called axion window of force ranges λ between 2•10-5 m and 0.02 m is interesting because only little experimental information is available there. Axion-like particles would induce a pseudo-magnetic field for neutrons close to bulk matter. A laboratory search investigates neutron spin precession close to a heavy mirror using ultracold neutrons in a magnetic resonance spectrometer. From the absence of a shift of the magnetic resonance we established new constraints on the coupling strength of axion-like particles in terms of the product gsgp of scalar and pseudo-scalar dimensionless constants, as a function of the force range λ, g_sg_p\lambda^2\leq 2\cdot10^{-21} [cm2] (C.L.95 For 0.1  cm < λ < 1 cm previous limits are improved by 4 to 5 orders of magnitude.