Precision measurements with polarized atoms

这个精密测量项目使用自旋极化气体来解决粒子物理学的基本问题。具体来说，该项目将重点完成CPT（电荷、宇称和时间反转）对称性和洛伦兹不变性的测试，测试使用的是放置在旋转平台上的由钾和氦-3制成的双磁力计。这个实验探索粒子物理标准模型之外的物理。第二个实验将使用这种双磁强计来寻找核自旋相关力。进一步的实验将使用由铯和氙-129制成的双磁力计来寻找永久的电子和原子核电偶极矩（edm）。有限EDM将是超出标准模型的CP（电荷和宇称）违反的签名。此外，基于自由自旋交换弛豫（SERF）碱金属蒸气的新磁计技术将得到发展，其目标是实现比目前可用的最佳磁场灵敏度高一个数量级的场灵敏度。该项目的更广泛影响包括开发可用于脑成像、地球物理、爆炸物探测和惯性导航的超灵敏磁计新技术。此外，它将促进从K-12到博士后的各级科学教育。

This precision measurement project employs spin-polarized gases to address fundamental questions of particle physics. Specifically the project will focus on the completion of a test of CPT (Charge, Parity, and Time Reversal) symmetry and Lorentz invariance using a dual magnetometer made of potassium and helium-3 placed on a rotating platform. This experiment probes physics beyond the Standard Model of particle physics. A second experiment using this dual magnetometer will search for nuclear spin-dependent forces. A further experiment, using a dual magnetometer made of cesium and xenon-129 will be used to search for a permanent electron and nuclear electric dipole moments (EDMs). A finite EDM would be a signature of CP (Charge and Parity) violation beyond the Standard Model. Additionally, new magnetometery techniques based on spin-exchange relaxation free (SERF) alakli-metal vapor will be developed with a goal of achieving field sensitivity an order of magnitude higher than the best magnetic field sensitivity available today. The broader impact of this project includes development of new techniques of ultra-sensitive magnetometery that can be used for brain imaging, geophysics, explosive detection and inertial navigation. In addition it will promote science education at all levels from K-12 to post-doctoral.