Precision Measurements with Polarized Spins

该研究计划旨在使用原子物理工具进行精确的共磁力测量，以实现对粒子物理标准模型之外的新物理的敏感搜索。 这些实验将采用一个双物质脉泽，同时使用光泵氙-129和氦-3气体。通过使用其中一个惰性气体脉泽作为共磁强计，并通过与原子钟的比较来稳定其脉泽频率，可以精确地控制第二个惰性气体脉泽的磁场环境，然后将该脉泽用作耦合到惰性气体核的新物理学的非常敏感的传感器，而原子电子没有显着的贡献。实验内容包括对中子的洛伦兹对称性（相对论的基本方面之一）和CPT（电荷共轭、宇称和时间反转）对称性进行灵敏度测试。该计划的更广泛影响包括将本研究中基于原子物理学的精密测量技术应用于开发新的磁力测量和生物成像工具。 磁共振成像（MRI）在低磁场的超极化惰性气体吸入到人类的肺部和类原子的氮空位（NV）的颜色中心的钻石，这可能会提供敏感的磁力计监测神经网络中的电磁活动，是两个例子。

This research program is aimed at performing precision co-magnetometry using atomic physics tools to enable sensitive searches for new physics beyond the Standard Model of particle physics. These experiments will employ a dual-species maser operating simultaneously with optically-pumped Xenon-129 and Helium-3 gas. By using one of the noble-gas masers as a co-magnetometer, and stabilizing its maser frequency by comparison to an atomic clock, one can precisely control the magnetic field environment of the second noble-gas maser and then employ this maser as a very sensitive sensor for new physics that couples to the noble gas nucleus, with no significant contribution from the atomic electrons. The experiments to be carried out include a sensitive test of Lorentz symmetry (one of the fundamental aspects of the theory of relativity) and CPT (Charge conjugation, Parity, and Time reversal) symmetry for the neutron.Broader impacts of the program include the application of the atomic physics based precision measurement techniques of this research into the development of novel tools for magnetometry and bioimaging. Magnetic resonance imaging (MRI) at low magnetic fields of hyperpolarized noble gas inhaled into human lungs and atom-like Nitrogen Vacancy (NV) color centers in diamond, which may provide sensitive magnetometers to monitor electromagnetic activity in neuronal networks, are two examples.