Abstract
An experimental search for an electric dipole moment in the diamagnetic atom 129 Xe is in progress through the precision measurement of spin precession frequency using an active nuclear spin maser. A 3 He comagnetometer has been incorporated into the active spin maser system in order to cancel out the long-term drifts in the external magnetic field. Also, a double-cell geometry has been adopted in order to suppress the frequency shifts due to interaction with polarized Rb atoms. The first EDM measurement with the 129 Xe active spin maser and the 3 He comagnetometer has been conducted.
Highlights
A permanent electric dipole moment (EDM) of a particle, atom, or molecule is an observable directly violating time reversal symmetry, and is sensitive to CP-violating phases beyond the framework of the Standard Model
The present study aims at measuring the EDM in the diamagnetic atom 129Xe to a size of |d| = 10−28 ecm, stepping into a domain below the present upper limit, |d| < 4.1 × 10−27 ecm [1]
The value of EDM is determined from difference between the frequencies of 129Xe spin precession measured with the electric field applied parallel and antiparallel to a magnetic field
Summary
A permanent electric dipole moment (EDM) of a particle, atom, or molecule is an observable directly violating time reversal symmetry, and is sensitive to CP-violating phases beyond the framework of the Standard Model. In the operation of the active spin maser with the 3He comagnetometer, the signal from the photodiode is divided into two, each being lock-in-amplified with 129Xe or 3He precession frequency, and the resulting two beat signals are stored in a disk in a computer and at the same time are processed individually to generate their feedback magnetic fields BFB through two separate coils. In order to suppress the frequency shift attributed to the polarized Rb, we replaced the cell with a new-type one, in which the gas volume is divided into a part for the optical pumping and a part for the optical detection. The active spin maser oscillation of 129Xe with the double cell has been successfully achieved, suppressing the frequency shift down below 1/10 of that obtained with the spherical cell. Details of the development of the active spin maser with the double cell is presented elsewhere [7]
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