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arXiv · 1503.08651

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

S. Afach·C. A. Baker·G. Ban·G. Bison·K. Bodek·Z. Chowdhuri·M. Daum·M. Fertl·B. Franke·P. Geltenbort·K. Green·M. G. D. van der Grinten·Z. Grujic·P. G. Harris·W. Heil·V. Hélaine·R. Henneck·M. Horras·P. Iaydjiev·S. N. Ivanov·M. Kasprzak·Y. Kermaïdic·K. Kirch·P. Knowles·H. -C. Koch·S. Komposch·A. Kozela·J. Krempel·B. Lauss·T. Lefort·Y. Lemière·A. Mtchedlishvili·O. Naviliat-Cuncic·J. M. Pendlebury·F. M. Piegsa·G. Pignol·P. N. Prashant·G. Quéméner·D. Rebreyend·D. Ries·S. Roccia·P. Schmidt-Wellenburg·N. Severijns·A. Weis·E. Wursten·G. Wyszynski·J. Zejma·J. Zenner·G. Zsigmond
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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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S. Afach, C. A. Baker, G. Ban, G. Bison, K. Bodek, Z. Chowdhuri, M. Daum, M. Fertl, B. Franke, P. Geltenbort, K. Green, M. G. D. van der Grinten, Z. Grujic, P. G. Harris, W. Heil, V. Hélaine, R. Henneck, M. Horras, P. Iaydjiev, S. N. Ivanov, M. Kasprzak, Y. Kermaïdic, K. Kirch, P. Knowles, H. -C. Koch, S. Komposch, A. Kozela, J. Krempel, B. Lauss, T. Lefort, Y. Lemière, A. Mtchedlishvili, O. Naviliat-Cuncic, J. M. Pendlebury, F. M. Piegsa, G. Pignol, P. N. Prashant, G. Quéméner, D. Rebreyend, D. Ries, S. Roccia, P. Schmidt-Wellenburg, N. Severijns, A. Weis, E. Wursten, G. Wyszynski, J. Zejma, J. Zenner, G. Zsigmond. 2015-03-30. Measurement of a false electric dipole moment signal from $^{199}$Hg atoms exposed to an inhomogeneous magnetic field. https://doi.org/10.1140/epjd/e2015-60207-4

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