Haiyang Yan

Laboratory search for spin-dependent short-range force from axionlike particles using optically polarized 3He gas

The possible existence of short-range forces between unpolarized and polarized spin-1/2 particles has attracted the attention of physicists for decades. These forces are predicted in various theories and provide a possible new source for parity (P) and time reversal (T) symmetry violation. We use an ensemble of polarized 3He gas in a cell with a 250 um thickness glass window to search for a force from scalar boson exchange over a sub-millimeter ranges. This interaction would produce a NMR frequency shift as an unpolarized mass is moved near and far from the polarized ensemble. We report a new upper bound on the product g_{s}g_{p}^{n} of the scalar couplings to the fermions in the unpolarized mass, and the pseudoscalar coupling of the polarized neutron in the 3He nucleus for force ranges from 1e-4 to 1e-2 m, which corresponds to a mass range of 2e-3 to 2e-5 eV for the scalar boson.

A Frequency Determination Method for Digitized NMR Signals

We present a high precision frequency determination method for digitized NMR FID signals. The method employs high precision numerical integration rather than simple summation as in many other techniques. With no independent knowledge of the other parameters of a NMR FID signal (phase

Continuously pumped

\phi

^{3}

, amplitude

He neutron spin filter using spin exchange optical pumping for polarized neutron scattering in material science

A

Progress of spin-dependent mesoscopic force experiments with rare-earth garnet test masses

, and transverse relaxation time

Laboratory Search for a Long-Range, scalar-pseudoscalar Interaction Using Dual-Species NMR with Polarized Xe129 and Xe131 Gas

T_{2}

Searches for possible T-odd and P-odd interactions of mesoscopic range using polarized nuclei and nonmagnetic masses

) this method can determine the signal frequency

High-frequency search for mass-coupled mesoscopic forces

f_{0}

Searches for possible T-odd and P-odd short range interactions using polarized nuclei

with a precision of