Bulletin of the American Physical Society
6th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Sunday–Friday, November 26–December 1 2023; Hawaii, the Big Island
Session D14: Minisymposium: Fundamental Symmetries II - Muon, Others
9:00 AM–11:15 AM,
Wednesday, November 29, 2023
Hilton Waikoloa Village
Room: Kohala 4
Chair: Peter Kammel, University of Washington
Abstract: D14.00003 : Rabi-Oscillation Spectroscopy of the Hyperfine Structure of the Muonium Atom for Fundamental Physics*
9:30 AM–9:45 AM
Presenter:
Hiroyuki A Torii
(School of Science, The University of Tokyo)
Authors:
Hiroyuki A Torii
(School of Science, The University of Tokyo)
Shoichiro Nishimura
(KEK, High Energy Accelerator Research Organization)
Koichiro Shimomura
(KEK, High Energy Accelerator Research Organization)
Collaboration:
MuSEUM
MuSEUM Collaboration is studying Mu-HFS at the J-PARC muon facility in Japan, aiming at a precision one order of magnitude better than that in the last experiment performed in 1990s at Los Alamos. In addition to our technical hardware developments to reduce systematic uncertainties, we have made significant improvements in the data analysis. In contrast to standard spectroscopic analysis which determines the resonance center frequency by fitting the resonance curve, our new spectroscopic technique does not require any frequency sweep. The resonance frequency can be obtained directly in the time domain without Fourier transformation, by fitting a simulated function to the time evolution of the Rabi oscillation at a fixed microwave frequency. This technique, named Rabi-oscillation spectroscopy, can improve the precision by eliminating systematic uncertainties due to power fluctuations.
Current achievements and near-future strategies of our experiments will be presented. This new spectroscopy will be a powerful tool for the study of other exotic atoms, and also applicable to short-lived systems like radioactive nuclei.
*This work was conducted under a user program (Proposals No. 2017A0134, No. 2017B0224, and No. 2018A0071) at J-PARC MLF. This work was supported by Japanese JSPS KAKENHI Grants No. JP23244046, No. JP26247046, No. JP15H05742, No. JP17H01133, No. JP19K14746, and JP21H04463.
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