Y. Matsuda
A5013295761- Muon and positron interactions and applications
- Atomic and Molecular Physics
- Particle physics theoretical and experimental studies
- Particle accelerators and beam dynamics
- Atomic and Subatomic Physics Research
- Quantum Chromodynamics and Particle Interactions
- Nuclear physics research studies
- Nuclear Physics and Applications
- High-Energy Particle Collisions Research
- Quantum, superfluid, helium dynamics
- Superconducting Materials and Applications
- Dark Matter and Cosmic Phenomena
- Cold Atom Physics and Bose-Einstein Condensates
- Particle Detector Development and Performance
- Advanced NMR Techniques and Applications
- Semiconductor Quantum Structures and Devices
- Plasma Diagnostics and Applications
- Magnetic confinement fusion research
- Advanced Frequency and Time Standards
- Physics of Superconductivity and Magnetism
- Quantum and electron transport phenomena
- Neutrino Physics Research
- Radiation Detection and Scintillator Technologies
- High-pressure geophysics and materials
- Particle Accelerators and Free-Electron Lasers
The University of Tokyo
2016-2025
Tokyo University of the Arts
2015-2024
Austrian Academy of Sciences
2024
Stefan Meyer Institute for Subatomic Physics
2022-2024
Asahikawa Medical University
2014-2023
Czech Academy of Sciences, Institute of Physics
2011-2023
Tokyo Institute of Technology
2011-2022
Bunkyo University
2019-2020
National Cerebral and Cardiovascular Center
2009-2017
Tokyo University of Science
2010-2017
Tolerance to abiotic stress is an important agronomic trait in crops and controlled by many genes, which are called quantitative loci (QTLs). Identification of these QTLs will contribute not only the understanding plant biology but also for breeding, achieve stable crop production around world. Previously, we mapped three controlling low-temperature tolerance at germination stage (called germinability). To understand molecular basis one QTLs, qLTG3-1 (quantitative locus germinability on...
This paper introduces a new approach to measure the muon magnetic moment anomaly |$a_{\mu} = (g-2)/2$| and electric dipole (EDM) |$d_{\mu}$| at J-PARC facility. The goal of our experiment is |$a_{\mu}$| using an independent method with factor 10 lower momentum, 20 smaller diameter storage-ring solenoid compared previous ongoing |$g-2$| experiments unprecedented quality storage field. Additional significant differences from present experimental include 1000 transverse emittance beam...
We have studied stars in nuclear emulsion due to the capture at rest of Ξ- hyperons produced (K-, K+) reaction. The sequential weak decay a double hypernucleus (nucleus with S = -2) has been directly observed. is assigned as either 10ΛΛBe or 13ΛΛB. This assignment excludes existence H dibaryon lighter than 2203.7 ±0.7 MeV/c2.
Antihydrogen, a positron bound to an antiproton, is the simplest antiatom. Its counterpart—hydrogen—is one of most precisely investigated and best understood systems in physics research. High-resolution comparisons both provide sensitive tests CPT symmetry, which fundamental symmetry Standard Model elementary particle physics. Any measured difference would point violation thus new Here we report development antihydrogen source using cusp trap for in-flight spectroscopy. A total 80 atoms are...
Condensed-matter systems that are both low-dimensional and strongly interacting often exhibit unusual electronic properties. Strongly correlated electrons with greatly enhanced effective mass present in heavy fermion compounds, whose structure is essentially three-dimensional. We realized experimentally a two-dimensional system, adjusting the dimensionality controllable fashion. Artificial superlattices of antiferromagnetic compound CeIn3 conventional metal LaIn3 were grown epitaxially. By...
We report here the first successful synthesis of cold antihydrogen atoms employing a cusp trap, which consists superconducting anti-Helmholtz coil and stack multiple ring electrodes. This success opens new path to make stringent test CPT symmetry via high precision microwave spectroscopy ground-state hyperfine transitions atoms.
The CPT theorem (the assumption that physical laws are invariant under simultaneous charge conjugation, parity transformation and time reversal) is central to the standard model of particle physics; here charge-to-mass ratio antiproton compared proton, with a precision 69 parts per trillion, result supports at atto-electronvolt scale. theorem, reversal, physics. Consequently, tests window onto physics beyond model. Here, Stefan Ulmer et al. test by measuring whether particles antiparticles,...
The magnetic moment of the antiproton is measured at parts-per-billion level, improving on previous measurements by a factor about 350. Comparing fundamental properties normal-matter particles with their antimatter counterparts tests charge–parity–time (CPT) invariance, which an important part standard model particle physics. Many have been to level uncertainty, but has not. Christian Smorra and colleagues now done so, report that it −2.7928473441 ± 0.0000000042 in units nuclear magneton....
Nailing down the proton magnetic moment Fundamental physical laws are believed to remain same if subjected three simultaneous transformations: flipping sign of electric charge, taking a mirror image, and running time backward. To test this parity, time-reversal (CPT) symmetry, it is desirable know fundamental properties particles such as high precision. Schneider et al. used double ion trap determine single trapped precision 0.3 parts per billion. Comparatively precise measurements quantity...
Cascade hypernuclei have been studied in the (K−,K+) reaction on a scintillating fiber target. The experimental result is compared with theoretical calculation order to extract information concerning Ξ− nucleus potential.Received 9 April 1998DOI:https://doi.org/10.1103/PhysRevC.58.1306©1998 American Physical Society
Charge-carrier transport in the presence of a nonequilibrium population edge states is studied both theoretically and experimentally. The attention focused on temperature dependence inter-edge-state (IES) electron scattering nonlinear effects edge-state transport, integer-quantum-Hall-effect regime. First, theoretical analysis IES transition developed, which explicitly considers Fermi distribution function electrons takes account long-range impurity acoustical-phonon scattering. explains...
We have measured the proton energy distribution from 4He(stopped K−,p) reaction by means of time-of-flight. A mono-energetic peak was observed, which is interpreted as formation a new kind neutral tribaryon S0(3115) with isospin T=1 and strangeness S=−1. The mass width state were deduced to be 3117.0−4.4+1.5MeV/c2 <21MeV/c2, respectively. mainly decays into ΣNN.
We observed a distinct peak in the Λp invariant mass spectrum of He3(K−,Λp)n, well below mK+2mp, i.e., threshold K− to be bound two protons. By selecting relatively large momentum-transfer region q=350∼650 MeV/c, one can kinematically separate from quasi-free process, K‾N→K‾N followed by non-resonant absorption spectator-nucleons K‾NN→ΛN. found that simplest fit gives us Breit–Wigner pole position at BKpp=47±3(stat.)−6+3(sys.) MeV having width ΓKpp=115±7(stat.)−20+10(sys.) MeV, and S-wave...
We constrain the coupling between axionlike particles (ALPs) and photons, measured with superconducting resonant detection circuit of a cryogenic Penning trap. By searching noise spectrum our fixed-frequency for peaks caused by dark matter ALPs converting into photons in strong magnetic field Penning-trap magnet, we are able to masses around $2.7906-2.7914\,\textrm{neV/c}^2$ $g_{a\gamma}< 1 \times 10^{-11}\,\textrm{GeV}^{-1}$. This is more than one order magnitude lower best laboratory...
We have measured the Balmer-series x-rays of kaonic $^4$He atoms using novel large-area silicon drift x-ray detectors in order to study low-energy $\bar{K}$-nucleus strong interaction. The energy $3d \to 2p$ transition was determined be 6467 $\pm$ 3 (stat) 2 (syst) eV. resulting strong-interaction energy-level shift is agreement with theoretical calculations, thus eliminating a long-standing discrepancy between theory and experiment.
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...
Abstract Efficient cooling of trapped charged particles is essential to many fundamental physics experiments 1,2 , high-precision metrology 3,4 and quantum technology 5,6 . Until now, sympathetic has required close-range Coulomb interactions 7,8 but there been a sustained desire bring laser-cooling techniques in macroscopically separated traps 5,9,10 extending control previously inaccessible such as highly ions, molecular ions antimatter. Here we demonstrate single proton using laser-cooled...