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The possible existence of short-range forces between unpolarized andpolarized spin-1/2 particles has attracted the attention of physicists fordecades. These forces are predicted in various theories and provide a possiblenew source for parity (P) and time reversal (T) symmetry violation. We use anensemble of polarized 3He gas in a cell with a 250 um thickness glass window tosearch for a force from scalar boson exchange over a sub-millimeter ranges.This interaction would produce a NMR frequency shift as an unpolarized mass ismoved near and far from the polarized ensemble. We report a new upper bound onthe product g_{s}g_{p}^{n} of the scalar couplings to the fermions in theunpolarized mass, and the pseudoscalar coupling of the polarized neutron in the3He nucleus for force ranges from 1e-4 to 1e-2 m, which corresponds to a massrange of 2e-3 to 2e-5 eV for the scalar boson.

Laboratory Search for Spin-dependent Short-range Force from Axion-Like-Particles using Optically Polarized 3He gas