M. Aoki
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View article: Development of the Range Counter for the COMET Phase- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si20.svg" display="inline" id="d1e819"> <mml:mi>α</mml:mi> </mml:math> Experiment
Development of the Range Counter for the COMET Phase- Experiment Open
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View article: Development of the Range Counter for the COMET Phase-$α$ Experiment
Development of the Range Counter for the COMET Phase-$α$ Experiment Open
The COMET Phase-$α$ experiment aims to evaluate the novel muon transport beamline for the muon-to-electron conversion search at J-PARC, Japan. A dedicated Range Counter (RC) was developed to measure the momentum spectrum of transported neg…
View article: New beamlines and future prospects of the J-PARC muon facility
New beamlines and future prospects of the J-PARC muon facility Open
At the J-PARC muon facility (MUSE), new beamlines started operation recently. H-line is a high-intensity pulsed muon beamline for fundamental physics experiments. The first beam of the H-line was delivered to its first branch (H1 area) in …
View article: Search for Heavy Neutrinos in \(\pi ^{ + } \to \mu ^{ + }\nu \) Decay and Status of Lepton Universality Test in the PIENU Experiment
Search for Heavy Neutrinos in \(\pi ^{ + } \to \mu ^{ + }\nu \) Decay and Status of Lepton Universality Test in the PIENU Experiment Open
In the present work of the PIENU experiment, heavy neutrinos were sought in pion decays \\(\\pi ^{ + } \\to \\mu ^{ + }\\nu \\). No evidence for extra peak was found in the muon kinetic energy spectrum and 90% confidence level upper limits…
View article: Coherent and incoherent space-charge effects in high-intensity hadron rings
Coherent and incoherent space-charge effects in high-intensity hadron rings Open
A brief overview is given of the recent work done by the beam-physics group of Hiroshima University on resonant beam instabilities in high-intensity hadron rings. Emphasis is placed upon two essentially different instability mechanisms, na…
View article: Search for the rare decays $\\pi^+ \\to \\mu^+\\nu_\\mu\\nu\\bar\\nu$ and $\\pi^+ \\to e^+\\nu_e\\nu\\bar\\nu$
Search for the rare decays $\\pi^+ \\to \\mu^+\\nu_\\mu\\nu\\bar\\nu$ and $\\pi^+ \\to e^+\\nu_e\\nu\\bar\\nu$ Open
The rare pion decays ${\\pi}^+{\\rightarrow}{\\mu}^+{\\nu}_{\\mu}{\\nu}\\bar{\\nu}$ and ${\\pi}^+{\\rightarrow}e^+{\\nu}_{e}{\\nu}\\bar{\\nu}$ are allowed in the Standard Model but highly suppressed. These decays were searched for using da…
View article: COMET Phase-I technical design report
COMET Phase-I technical design report Open
The Technical Design for the COMET Phase-I experiment is presented in this paper. COMET is an experiment at J-PARC, Japan, which will search for neutrinoless conversion of muons into electrons in the field of an aluminum nucleus ($\mu$–$e$…
View article: Development of a multiwire proportional chamber with good tolerance to burst hits
Development of a multiwire proportional chamber with good tolerance to burst hits Open
The DeeMe experiment to search for muon-to-electron conversions with a sensitivity 10--100 times better than those achieved by previous experiments is in preparation at the Japan Proton Accelerator Research Complex. The magnetic spectromet…
View article: High precision measurement of muonium hyperfine structure
High precision measurement of muonium hyperfine structure Open
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 a stringent test of the bound-state QED. From thi…
View article: New concept for a large-acceptance general-purpose muon beamline
New concept for a large-acceptance general-purpose muon beamline Open
Power upgrades of accelerators and the development of new beamlines have prompted high-precision measurements to be updated and reveal new phenomena. Several accelerators operate in the mega-watt regime, and a number of experiments are pla…
View article: High-Precision Microwave Spectroscopy of Muonium for Determination of Muonic Magnetic Moment
High-Precision Microwave Spectroscopy of Muonium for Determination of Muonic Magnetic Moment Open
The muonium atom is a system suitable for precision measurements for determination of muon’s fundamental properties as well as for the test of quantum electrodynamics (QED). A microwave spectroscopy experiment of this exotic atom is being …