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Measurement of a false electric dipole moment signal from $^{199}$Hg atoms exposed to an inhomogeneous magnetic field

Abstract : We report on the measurement of a Larmor frequency shift proportional to the electric-field strength for $^{199}{\rm Hg}$ atoms contained in a volume permeated with aligned magnetic and electric fields. This shift arises from the interplay between the inevitable magnetic field gradients and the motional magnetic field. The proportionality to electric-field strength makes it apparently similar to an electric dipole moment (EDM) signal, although unlike an EDM this effect is P- and T-conserving. We have used a neutron magnetic resonance EDM spectrometer, featuring a mercury co-magnetometer and an array of external cesium magnetometers, to measure the shift as a function of the applied magnetic field gradient. Our results are in good agreement with theoretical expectations.
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http://hal.in2p3.fr/in2p3-01140188
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Submitted on : Wednesday, April 8, 2015 - 8:27:42 AM
Last modification on : Wednesday, September 16, 2020 - 5:45:21 PM

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S. Afach, C. A. Baker, G. Ban, G. Bison, K. Bodek, et al.. Measurement of a false electric dipole moment signal from $^{199}$Hg atoms exposed to an inhomogeneous magnetic field. The European Physical Journal D : Atomic, molecular, optical and plasma physics, EDP Sciences, 2015, 69, pp.225. ⟨10.1140/epjd/e2015-60207-4⟩. ⟨in2p3-01140188⟩

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