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Poster communications

Systematic effect measurements related to 199Hg in the nEDM experiment

Abstract : The nEDM experiment benefits from two atomic magnetometers to characterize the magnetic field environment. The 199Hg co-magnetometer allows to correct the neutron frequency for magnetic field drift at the sub-ppm level but does not provide any magnetic field homogeneity informations. Consequently, a dedicated array of 16 Cesium magnetometers (CsM) has been built in the last 3 years allowing a control of vertical magnetic gradients at the 10pT/cm level, which is a critical point for systematic uncertainties estimation in the nEDM experiment. Since 2012, important results have been obtained combining both 199Hg and Cs magnetometers. I will present the last one: a false electric dipole moment of 199Hg atoms correlated to an electric field. In addition, in the context of the neutron to Hg magnetic moment ratio estimation, we put for the first time in the nEDM experiment, a limit on the systematic light shift effect related to the interaction of the probe light UV photons with the 199Hg atoms gas.
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Poster communications
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Contributor : Emmanuelle Vernay <>
Submitted on : Friday, November 14, 2014 - 1:10:52 PM
Last modification on : Thursday, November 19, 2020 - 12:59:04 PM


  • HAL Id : in2p3-01082789, version 1




Y. Kermaïdic. Systematic effect measurements related to 199Hg in the nEDM experiment. nternational Workshop « Challenges of the World-Wide Experimental Search for the Electric Dipole Moment of the Neutron (nEDM2014) », Nov 2014, Ascona, Switzerland. ⟨in2p3-01082789⟩



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