Speaker
Dr
Tomoya Sato
(Department of Physics, Tokyo Institute of Technology; RIKEN Nishina Center for Accelerator-Based Science)
Description
Due to its almost undetectablly small magnitudes predicted from the Standard Model (SM), detection of a non-zero electric dipole moment (EDM) is expected to prove the existence of new physics beyond the SM. Even so, the expected signals for an EDM are extremely small, and thus an elaborate scheme for the suppression of errors in its measurement is essential. As for the atomic EDM of Xe, which is an objective of the present work, the current upper limit of 4.1×10$^{-27}$ecm corresponds to a ~40 nHz accuracy under the application of a 10 kV/cm electric field. In order to improve this upper limit, we in this work propose the use of a co-existing $^{129}$Xe and $^{131}$Xe spin maser complex running in an external feedback scheme. The $^{129}$Xe and $^{131}$Xe spins, which cohabit in the same cell volume, sense the same magnetic field and thus the effects of a long-term drift in the magnetic field are cancelled out. In particular, the systematic error arising from the interactions with polarized Rb atoms is largely eliminated thanks to their very similar strengths of coupling to Rb, as opposed to the case of a $^{129}$Xe-$^{3}$He combination. Our external feedback scheme will ease difficulties arising from the shorter relaxation time and quadrupole frequency splitting of $^{131}$Xe. In this presentation, we will report on the first operation of the $^{131}$Xe maser, and its stability, and discuss future perspectives for our planned Xe EDM measurement.
Primary author
Dr
Tomoya Sato
(Department of Physics, Tokyo Institute of Technology; RIKEN Nishina Center for Accelerator-Based Science)
Co-authors
Prof.
Akihiro Yoshimi
(Research Institute for Interdisciplinary Science, Okayama University)
Ms
Chika Hirao
(Department of Physics, Tokyo Institute of Technology)
Ms
Chikako Funayama
(Department of Physics, Tokyo Institute of Technology)
Prof.
Christopher Bidinosti
(Department of Physics, University of Winnipeg)
Ms
Eri Hikota
(Department of Physics, Tokyo Institute of Technology)
Dr
Hideki Ueno
(RIKEN Nishina Center for Accelerator-Based Science)
Prof.
Koichiro Asahi
(Department of Physics, Tokyo Institute of Technology; RIKEN Nishina Center for Accelerator-Based Science)
Mr
Masatoshi Chikamori
(Department of Physics, Tokyo Institute of Technology)
Mr
Shuichiro Kojima
(Department of Physics, Tokyo Institute of Technology)
Mr
Shunya Tanaka
(Department of Physics, Tokyo Institute of Technology)
Prof.
Takashi Ino
(Institute of Material Structure Science, KEK)
Prof.
Takeshi Fukuyama
(RCNP, Osaka University)
Prof.
Takeshi Furukawa
(Department of Physics, Tokyo Metropolitan University)
Mr
Yu Sakamoto
(Department of Physics, Tokyo Institute of Technology)
Dr
Yuichi Ichikawa
(Department of Physics, Tokyo Institute of Technology; RIKEN Nishina Center for Accelerator-Based Science)
Mr
Yuichi Ohtomo
(Department of Physics, Tokyo Institute of Technology)
Prof.
Yukari Matsuo
(Department of Advanced Sciences, Hosei University)
