Department of Physics, Princeton University, Princeton, New Jersey 08544, USA.
Phys Rev Lett. 2009 Dec 31;103(26):261801. doi: 10.1103/PhysRevLett.103.261801. Epub 2009 Dec 29.
A magnetometer using spin-polarized K and 3He atoms occupying the same volume is used to search for anomalous nuclear spin-dependent forces generated by a separate 3He spin source. We measure changes in the 3He spin precession frequency with a resolution of 18 pHz and constrain anomalous spin forces between neutrons to be less than 2x10(-8) of their magnetic or less than 2x10(-3) of their gravitational interactions on a length scale of 50 cm. We present new limits on neutron coupling to light pseudoscalar and vector particles, including torsion, and constraints on recently proposed models involving unparticles and spontaneous breaking of Lorentz symmetry.
一种使用占据相同体积的极化 K 和 3He 原子的磁力计，用于搜索由单独的 3He 自旋源产生的异常核自旋相关力。我们以 18 pHz 的分辨率测量 3He 自旋进动频率的变化，并限制中子之间的异常自旋力小于其磁相互作用或小于其引力相互作用的 2x10(-8)，在 50 厘米的长度尺度上。我们提出了对轻赝标量和矢量粒子（包括扭转）与中子耦合的新限制，以及对最近提出的涉及无质量粒子和洛伦兹对称性自发破缺的模型的限制。
