EDM measurement in 129 Xe atom using dual active feedback nuclear spin maser
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EDM measurement in 129 Xe atom using dual active feedback nuclear spin maser T. Sato · Y. Ichikawa · Y. Ohtomo · Y. Sakamoto · S. Kojima · C. Funayama · T. Suzuki · M. Chikamori · E. Hikota · M. Tsuchiya · T. Furukawa · A. Yoshimi · C. P. Bidinosti · T. Ino · H. Ueno · Y. Matsuo · T. Fukuyama · K. Asahi
Received: 21 September 2014 / Accepted: 10 December 2014 © Springer International Publishing Switzerland 2014
Abstract The technique of an active nuclear spin maser is adopted in the search for electric dipole moment in a diamagnetic atom 129 Xe. In order to reduce systematic uncertainties arising from long-term drifts of the external magnetic field and from the contact interaction between longitudinal polarized Rb atoms and 129 Xe spin, a 3 He comagnetometer with a Proceedings of the 5th Joint International Conference on Hyperfine Interactions and International Symposium on Nuclear Quadrupole Interactions (HFI/NQI 2014) Canberra, Australia, 21-26 September 2014 T. Sato () · Y. Ohtomo · Y. Sakamoto · S. Kojima · C. Funayama · T. Suzuki · M. Chikamori · E. Hikota · M. Tsuchiya · K. Asahi Department of Physics, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro, Tokyo 152-8551, Japan e-mail: [email protected] Y. Ichikawa · H. Ueno RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan T. Furukawa Department of Physics, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan A. Yoshimi Research Core for Extreme Quantum World, Okayama University, 3-1-1 Tsushimanaka, Kita, Okayama 700-8530, Japan C. P. Bidinosti Department of Physics, University of Winnipeg, 515 Portage Avenue, Winnipeg, Manitoba, Canada T. Ino Institute of Material Structure Science, KEK, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan Y. Matsuo Department of Advanced Sciences, Hosei University, 3-7-2 Kajino-cho, Koganei, Tokyo 184-8584, Japan T. Fukuyama RCNP, Osaka University, 10-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan
double-cell geometry was employed. The remaining shift, which turned out to show some correlation with the cell temperature, was mitigated by stabilizing the cell temperature. As a result, the frequency drift of the 129 Xe maser was reduced from 12 mHz to 700 μHz, and the determination precision of frequency of 8.7 nHz was obtained for a 2 × 104 s measurement time using the double-cell geometry cell. Keywords Electric dipole moment · Nuclear spin maser · Fundamental symmetry 1 Introduction The search of a permanent electric dipole moment (EDM) is one of the most promising ways to explore new physics beyond the Standard Model (SM) of elementary particles. Since predicted values for the EDM in the SM are too small to detect in current experimental techniques, discovery of a finite value of EDM would strongly indicate existence of physics beyond the SM. At present, the most stringent upper limit on the EDM in diamagnetic atom is set by the 199 Hg experiment [1] as |d(199 Hg)| < 0.31 × 10−28 ecm. The EDM of a diamagnetic atom primarily arises from a CP-odd nuclear moment, the Schiff mom
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