Nuclear spin maser and experimental search for 129 Xe atomic EDM
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Nuclear spin maser and experimental search for 129 Xe atomic EDM T. Inoue · T. Furukawa · A. Yoshimi · Y. Ichikawa · M. Chikamori · Y. Ohtomo · M. Tsuchiya · N. Yoshida · H. Shirai · M. Uchida · K. Suzuki · T. Nanao · H. Miyatake · H. Ueno · Y. Matsuo · T. Fukuyama · K. Asahi
Published online: 7 February 2013 © Springer Science+Business Media Dordrecht 2013
Abstract The present status of an active spin maser which is being developed for an experimental search for 129 Xe atomic electric dipole moment (EDM) is presented. In order to realize the long term stability of maser frequency, systematic effects for the spin maser operation were investigated. The correlations in the maser frequency
This work is supported in part by the Grant-in-Aid for Scientific Research on Innovative Areas (No. 21104004) and the Grant-in-Aid for Scientific Research (A) (No. 21244029) by the Ministry of Education, Culture, Sports, Science, and Technology, Japan. Proceedings of the 4th Joint International Conference on Hyperfine Interactions and International Symposium on Nuclear Quadrupole Interactions (HFI/NQI 2012), Beijing, China, 10–14 September 2012. T. Inoue · Y. Ichikawa · M. Chikamori · Y. Ohtomo · M. Tsuchiya · N. Yoshida · H. Shirai · M. Uchida · K. Suzuki · T. Nanao · H. Miyatake · K. Asahi Department of Physics, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo 152-8551, Japan T. Furukawa Department of Physics, Tokyo Metropolitan University, 1-1 Minami-Ohsawa, Hachioji, Tokyo 192-0397, Japan A. Yoshimi Research Core for Extreme Quantum World, Okayama University, 3-1-1 Tsushimanaka, Kita, Okayama 700-8530, Japan H. Ueno · Y. Matsuo RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan T. Fukuyama Ritsumeikan University, Nojihigashi, Kusatsu, Shiga 525-8577, Japan Present Address: T. Inoue (B) Cyclotron and Radioisotope Center, Tohoku University, Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-8578, Japan e-mail: [email protected]; [email protected]
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with the solenoid current, the environmental field and the cell temperature were found. With the solenoid current and environmental field being stabilized and the cell temperature lowered, a frequency precision of 7.9 nHz has been achieved for the maser operation. Keywords Nuclear spin maser · Electric dipole moment · CP violation
1 Introduction The study of permanent electric dipole moment (EDM) of a particle is a useful probe to search for physics beyond the standard model (SM) of elementary particles [1]. The EDM directly violates the time reversal symmetry and hence the CP symmetry through the CPT theorem. The predicted size of the EDM in the SM is too small to be detected, since the CP-violating phase contained in the SM contributes only to flavor changing processes, as observed in the CP-nonconserving decays of K and B mesons [2–4]. On the other hand, the EDM is sensitive to such phases in the physics beyond the SM allowing for EDM to acquire values within the experimental reach [5]. Thus, an experimental
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