A5103162083- Muon and positron interactions and applications
- Particle accelerators and beam dynamics
- Atomic and Molecular Physics
- Superconducting Materials and Applications
- Particle Accelerators and Free-Electron Lasers
- Advanced NMR Techniques and Applications
- Atomic and Subatomic Physics Research
- Particle Detector Development and Performance
- Gyrotron and Vacuum Electronics Research
The University of Tokyo
2016-2023
RIKEN Nishina Center
2023
RIKEN
2021
Nippon Soken (Japan)
2021
High Energy Accelerator Research Organization
2019
Tokyo University of the Arts
2016-2017
A hydrogen-like atom consisting of a positive muon and an electron is known as muonium. It near-ideal two-body system for precision test bound-state theory fundamental symmetries. The MuSEUM collaboration performed new measurement the muonium ground-state hyperfine structure at J-PARC using high-intensity pulsed beam high-rate capable positron counter. resonance transition was successfully observed near-zero magnetic field, interval $ν_{\text{HFS}}$ = 4.463302(4) GHz obtained with relative...
As a new method to determine the resonance frequency, Rabi-oscillation spectroscopy has been developed. In contrast conventional which draws curve, fits time evolution of Rabi oscillation. By selecting optimized it is shown that precision twice as good with frequency sweep. Furthermore, data under different conditions can be treated in unified manner, allowing more efficient measurements for systems consisting limited number short-lived particles produced by accelerators such muons. We have...
Muonic helium atom hyperfine structure (HFS) measurements are a sensitive tool to test the three-body atomic system and bound-state quantum electrodynamics theory, determine fundamental constants of negative muon magnetic moment mass. The world's most intense pulsed beam at Muon Science Facility Japan Proton Accelerator Research Complex allows improvement previous testing further $CPT$ invariance by comparing moments masses positive muons (second-generation leptons). We report new...
High precision measurements of the ground state hyperfine structure (HFS) muonium is a stringent tool for testing bound-state quantum electrodynamics (QED) theory, determining fundamental constants muon magnetic moment and mass, searches new physics. Muonium most suitable system to test QED because both theoretical experimental values can be precisely determined. Previous were performed decades ago at LAMPF with uncertainties mostly dominated by statistical errors. At J-PARC Muon Science...
The MuSEUM collaboration is planning measurements of the ground-state hyperfine structure (HFS) muonium at Japan Proton Accelerator Research Complex (J-PARC), Materials and Life Science Experimental Facility. high-intensity beam that will soon be available H-line allows for more precise by one order magnitude. We plan to conduct two staged measurements. First, we measure Mu-HFS in a near-zero magnetic field, thereafter it strong field. have developed microwave cavities this purpose....
Muonium spectroscopy experiment using microwave and J-PARC E34 (J-PARC muon g-2/EDM) experiments aim to measure the hyperfine structure of muonium anomalous magnetic moment muon, respectively. Both require homogeneous fields better than 1 ppm. Therefore, we developed a standard probe calibrate field measurement probes, with resolution 1.92±0.18 ppb. Moreover, shift nuclear resonance frequency was also evaluated, total uncertainty is ±17.7
Abstract Measurements of the muonic helium atom hyperfine structure (HFS) are a sensitive tool to test theory three-body atomic systems and bound-state quantum electrodynamics (QED) determine fundamental constants negative muon magnetic moment mass. The world’s most intense pulsed beam at J-PARC MUSE brings an opportunity improve previous measurements further CPT invariance by comparing moments masses positive muons. Test D-line now in progress utilizing MuSEUM apparatus zero field. first...
MuSEUM (Muonium Spectroscopy Experiment Using Microwave) collaboration aims to measure the muonium hyperfine structure (MuHFS,vhfs) with a few ppb (parts per billion). MuHFS spectroscopy is stringent test of bound-state QED. From this measurement, muon-proton magnetic moment ratio (μμ/μP) and muon-electron mass (mμ/me) can also be determined by applying high field. In previous measurement carried out at Los Alamos Meson Physics Facility (LAMPF), main uncertainty was caused lack statistics....
Muonium is one of the best probes for test bound-state QED, owing to absence effect from internal structure nucleons. The recent establishment intense pulsed muon beams at Japan Proton Accelerator Research Complex (J-PARC) paves way improved measurement muonium ground-state hyperfine (MuHFS). MuHFS also determines magnetic moment precisely, which an important input parameter measurements g-2, known 3-sigma discrepancy between experiment and theory. Spectroscopy Experiment Using Microwave...
Muonic helium atom hyperfine structure (HFS) measurements are a sensitive tool to test the three-body atomic system and bound-state quantum electrodynamics theory, determine fundamental constants of negative muon magnetic moment mass. The world's most intense pulsed beam at Muon Science Facility Japan Proton Accelerator Research Complex allows improvement previous testing further $CPT$ invariance by comparing moments masses positive muons (second-generation leptons). We report new...