Experimental search for the electron electric dipole moment with laser cooled francium atoms
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Experimental search for the electron electric dipole moment with laser cooled francium atoms T. Inoue · S. Ando · T. Aoki · H. Arikawa · S. Ezure · K. Harada · T. Hayamizu · T. Ishikawa · M. Itoh · K. Kato · H. Kawamura · A. Uchiyama · T. Aoki · K. Asahi · T. Furukawa · A. Hatakeyama · K. Hatanaka · K. Imai · T. Murakami · H. S. Nataraj · T. Sato · Y. Shimizu · T. Wakasa · H. P. Yoshida · A. Yoshimi · Y. Sakemi
© Springer International Publishing Switzerland 2014
Abstract A laser cooled heavy atom is one of the candidates to search for the permanent electric dipole moment (EDM) of the electron due to the enhancement mechanism and its long coherence time. The laser cooled francium (Fr) factory has been constructed to perform the electron EDM search at the Cyclotron and Radioisotope Center, Tohoku University. The present status of Fr production and the EDM measurement system is presented.
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. Inoue () Frontier Research Institute of Interdisciplinary Sciences, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai, Miyagi, 980-8578, Japan e-mail: inoue [email protected] T. Inoue · S. Ando · T. Aoki · H. Arikawa · S. Ezure · K. Harada · T. Hayamizu · T. Ishikawa · M. Itoh · K. Kato · H. Kawamura · A. Uchiyama · Y. Sakemi Cyclotron and Radioisotope Center, Tohoku University, Miyagi, Japan T. Aoki Graduate School of Arts and Sciences, University of Tokyo, Tokyo, Japan K. Asahi · T. Sato Department of Physics, Tokyo Institute of Technology, Tokyo, Japan T. Furukawa Department of Physics, Tokyo Metropolitan University, Tokyo, Japan A. Hatakeyama Department of Applied Physics, Tokyo University of Agriculture and Technology, Tokyo, Japan K. Hatanaka · H. P. Yoshida Research Center for Nuclear Physics, Osaka University, Osaka, Japan K. Imai Advanced Science Research Center, Japan Atomic Energy Agency, Ibaraki, Japan
T. Inoue et al.
Keywords CP violation · Electric dipole moment · Laser cooling · Radioactive atom
1 Introduction Several theoretical models beyond the standard model (SM) have been proposed to solve the problems unanswered in the SM, such as why the present universe is dominated by matter. These models have additional CP violating processes which do not appear in the SM. The permanent electric dipole moment (EDM) is a suitable observable for testing the models beyond the SM, since the EDM is the flavor-diagonal observable violating the time reversal symmetry and hence the CP invariance under the CPT theorem [1]. The EDM search is being performed and planned in various types of particles, such as neutron, diamagnetic atom, paramagnetic atom, molecule and charged particle [2]. In this report, we present an experiment to search for the electron EDM by using the laser cooled francium (Fr) atoms at Cyclotron and Radioisotope Center (CYRIC), Tohoku University.
2 Electron EDM search with laser cooled Fr atoms The e
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