利用光学极化~ 3 He气体研究类轴子粒子的自旋短程力
Laboratory Search for Spin-dependent Short-range Force from Axion-Like-Particles using Optically Polarized 3He gas
摘要：
非极化和极化自旋-1/2粒子之间可能存在短程力，这引起了物理学家几十年的关注。这些力在各种理论中被预测，并为宇称（P）和时间反演（T）对称性破坏提供了可能的新来源。我们在一个有250 μ m厚玻璃窗的池中使用极化的~ 3 He气体系综来搜索亚毫米范围内的标量玻色子交换力。这种相互作用会产生一个NMR频移作为一个非极化的质量移动附近和远离极化的合奏。本文给出了非极化质量下标量与费米子耦合的乘积g_{s} g_{p} ^{n}的一个新的上界，并给出了极化中子在3 He核中的赝标耦合，其力的范围为1 e-4 ~ 1 e-2 m，对应于标量玻色子的质量范围为2 e-3 ~ 2 e-5 eV.
英文摘要：
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.
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