Search of atomic EDM with precise control of nuclear spin

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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.