Abstract
Uncertainty in the frequency precision of the planned experiment to search for a 129 Xe atomic electric dipole moment is dominated by drifts in the frequency shift due to contact interaction of 129 Xe with polarized Rb valence electrons. In order to suppress the frequency shift, a double-cell geometry has been adopted for the confinement of 129 Xe gas. A new process has been identified to take part in the optical detection of spin pre- cession. The parameters controlling the oscillation of the maser in this new double-cell arrangement were optimized. As a result, the frequency shift has been reduced by a factor of 10 or more from the former single-cell geometry.
Highlights
A permanent electric dipole moment (EDM) which directly violates time reversal symmetry attracts much attention, because an unknown CP-violating phase which is necessary to understand the present matter-dominated Universe is expected to be probed by EDM
Taking account of the three free induction decay (FID) experiments and the two processes, the signal amplitude from the active spin maser with the double-cell geometry is estimated to be ∼1/7 of that with the single-cell geometry, provided that the possible reduction in 129Xe polarization due to diffusion is not taken into account
A double-cell geometry has been introduced into the active nuclear spin maser, in order to reduce the frequency shift due to contact interaction with polarized Rb valence electrons
Summary
A permanent electric dipole moment (EDM) which directly violates time reversal symmetry attracts much attention, because an unknown CP-violating phase which is necessary to understand the present matter-dominated Universe is expected to be probed by EDM. Previous development on the active spin maser has achieved a precision δν = 9.3 nHz for the frequency averaged over a single-shot observation of continued precession sustained for 3 × 104 s [3]. The double-cell geometry enables us to suppress Rb polarization in the optical detection part and to reduce the frequency shift
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