Search for Spin-Dependent Short-Range Force Using Optically Polarized 3He Gas
Abstract
We propose a new method to detect short-range P- and T- violating interactions between nucleons, based on measuring the precession frequency shift of polarized 3He nuclei in the presence of an unpolarized mass. To maximize the sensitivity, a high-pressure 3He cell with thin glass windows (250 μ m) is used to minimize the distance between the mass and 3He. The magnetic field fluctuation is suppressed by using the 3He gas in a different region of the cell as a magnetometer. Systematic uncertainties from the magnetic properties of the mass are suppressed by flipping both the magnetic field and spin directions. Without any magnetic shielding, our result has already reached the sensitivity of the current best limit. With improvement in uniformity and stability of the field, we can further improve the sensitivity by two orders of magnitude over the force range from 10-4-10-2 m.
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