Publications [#246099] of Haiyan Gao

Papers Published

1. Chu, PH; Gao, H; others, Laboratory Search for Spin-dependent Short-range Force from Axion-Like-Particles using Optically Polarized 3He gas, Phys. Rev. Lett., vol. 87 no. 1 (December, 2012), pp. 011105R, American Physical Society (APS), ISSN 1550-7998 [Gateway.cgi], [doi]
   (last updated on 2026/01/14)

   Abstract:
   The possible existence of short-range forces between unpolarized and polarized spin-12 particles has attracted the attention of physicists for decades. These forces are predicted in various theories and provide a possible new source for parity and time-reversal symmetry violation. We use an ensemble of polarized He3 gas in a cell with a 250-μm thick glass window to search for a force from pseudoscalar boson exchange over sub-millimeter ranges. This interaction would produce an NMR frequency shift as an unpolarized mass is moved near and far from the polarized ensemble. We report a new upper bound with a factor of 10-30 improvement on the product gsgpn of the scalar couplings to the fermions in the unpolarized mass, and the pseudoscalar coupling of the polarized neutron in the He3 nucleus for force ranges from 10 -4 to 10-2 m, which corresponds to a mass range of 2×10-3 to 2×10-5 eV for the pseudoscalar boson. This represents the most sensitive search that sets a direct limit on the important "axion window." © 2013 American Physical Society.