Parity and Time Reversal Tests in Atoms

该项目的主要目的是继续在原子实验方面取得最新进展，旨在发现和测量违反宇称和时间反演对称性。 一个主要的努力是寻找一个永久的原子电偶极矩（EDM），它可以存在，只有当时间反演对称性被违反。 这将通过汞EDM实验来完成，该实验已经达到了如此高的灵敏度，以至于现在可以对低能超对称和其他自然发生T破坏的模型进行严格的测试。 与此同时，光学冷却和捕获的反磁性原子，主要是镱和镭的实验，将被用来探索一个可能的新领域的电火花加工灵敏度。 其他相关的努力包括奇偶校验不守恒（PNC）实验在铊和一个新的PNC实验的发展与一个单一的电离钡离子。

The main thrust of this project is to continue recent advances in atomic experiments designed to find and measure violations of parity and time-reversal symmetries. A major effort is the search for a permanent atomic electric dipole moment (EDM), which can exist only if time-reversal symmetry is violated. This will be done with a mercury EDM experiment, which has reached such a level of sensitivity that it is now possible to make an exacting test of low energy supersymmetry and other models in which T-violation would occur naturally. At the same time, an experiment with optically cooled and trapped diamagnetic atoms, chiefly ytterbium and radium, will be used to explore a possible new realm of EDM sensitivity. Other related efforts include parity nonconservation (PNC) experiments in thallium and the development of a new PNC experiment with a singly ionized barium ion.