Search of atomic EDM with precise control of nuclear spin

CP破坏的起源是现代物理学研究的重要课题之一，它是在粒子衰变中发现的，被认为是宇宙中物质-反物质不对称性的根源之一。为了寻找违反CP对称性的原子EDM，开展了129 π自旋进动超高精度测量的研究和发展。研究了自旋系统的各种涨落，研制了高灵敏度磁强计，提高了低频核自旋振荡器的频率稳定性。在电场强度为10 kV/cm时，对129 μ m的原子电火花加工，其灵敏度为5×10 ~（-28）ecm（测量时间为45,000 s）。

The origin of CP violation, which was discovered in particle decay and is considered to be one of sources for matter-antimatter asymmetry in universe, is one of important objectives in modern physics. In order to search for atomic EDM violating CP symmetry, the research and development have been conducted for ultra-high precision measurement of nuclear spin precession of 129Xe. The various fluctuations to the spin system have been investigated, high sensitivity magnetometer have been developed, leading to improvement of frequency stability for low-frequency nuclear spin oscillator. The sensitivity of 5×10-28 ecm for atomic EDM of 129Xe has been achieved (with a measurement time of 45,000 s) assuming the electric field strength of 10 kV/cm.