Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2009-12-11
JETP Lett.91:6-10,2010
Physics
Nuclear Physics
Nuclear Experiment
10 pages, 3 figures
Scientific paper
10.1134/S0021364010010029
The search for CP violating forces between nucleons in the so-called axion window of force ranges lam between 2x10^-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 gs x gp of scalar and pseudo-scalar dimensionless constants, as a function of the force range lam, gs x gp x lam^2 <= 2x10-21 [cm^2] (C.L.95%) for 10^-4 cm < lam < 1 cm. For 0.1 cm < lam < 1 cm previous limits are improved by 4 to 5 orders of magnitude.
Aleksandrov E. B.
Dmitriev S. P.
Dovator N. A.
Fomin A. K.
Geltenbort Peter
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