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

Afach, S, Baker, C A, Ban, G, Bison, G, Bodek, K, Chowdhuri, Z, Daum, M, Fertl, M, Franke, B, Geltenbort, P, Green, K, van der Grinten, M G D, Grujic, Z, Harris, P G, Heil, W, Hélaine, V, Henneck, R, Horras, M, Iaydjiev, P, Ivanov, S N, Kasprzak, M, Kermaïdic, Y, Kirch, K, Knowles, P, Koch, H-C, Komposch, S, Kozela, A, Krempel, J, Lauss, B, Lefort, T, Lemière, Y, Mtchedlishvili, A, Naviliat-Cuncic, O, Pendlebury, J M, Piegsa, F M, Pignol, G, Prashant, P N, Quéméner, G, Rebreyend, D, Ries, D, Roccia, S, Schmidt-Wellenburg, P, Severijns, N, Weis, A, Wursten, E, Wyszynski, G, Zejma, J, Zenner, J and Zsigmond, G (2015) Measurement of a false electric dipole moment signal from 199Hg atoms exposed to an inhomogeneous magnetic field. European Physical Journal D, 69 (10). a225. ISSN 1434-6060

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Abstract

We report on the measurement of a Larmor frequency shift proportional to the electric-field strength for 199Hg 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.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QC Physics
Depositing User: Philip Harris
Date Deposited: 13 Oct 2015 12:14
Last Modified: 13 Mar 2017 12:02
URI: http://sro.sussex.ac.uk/id/eprint/57095

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