A5102785584- Particle physics theoretical and experimental studies
- Muon and positron interactions and applications
- Neutrino Physics Research
- Particle accelerators and beam dynamics
- Chalcogenide Semiconductor Thin Films
- Quantum Chromodynamics and Particle Interactions
- Superconducting Materials and Applications
- Particle Detector Development and Performance
- High-Energy Particle Collisions Research
- Semiconductor Quantum Structures and Devices
- Particle Accelerators and Free-Electron Lasers
- Dark Matter and Cosmic Phenomena
- Quantum Dots Synthesis And Properties
- Advanced Semiconductor Detectors and Materials
- Astrophysics and Cosmic Phenomena
- Phase-change materials and chalcogenides
- Ga2O3 and related materials
- GaN-based semiconductor devices and materials
- Radiation Detection and Scintillator Technologies
- Semiconductor materials and interfaces
- Catalytic Cross-Coupling Reactions
- Chemical Synthesis and Characterization
- Magnetic confinement fusion research
- Catalytic C–H Functionalization Methods
- Asymmetric Hydrogenation and Catalysis
Nihon University
2025
Osaka University
2013-2023
Hiroshima University
1981-2020
Osaka University of Tourism
2011
Kyushu University
2009
Sanyo-Onoda City University
2008
TRIUMF
2002-2008
Brookhaven National Laboratory
2000
Yamagata University
1998-1999
Keio University
1993-1994
The combination of IrCl(CO)(PPh3)2 with 1,1,3,3-tetramethyldisiloxane or poly(methylhydrosiloxane) (PMHS) is found to be an efficient catalyst system for the preparation aldenamines from carboxamides; in particular, facile removal silicone and iridium residues product can achieved by use PMHS.
Absorption and reflection spectra of β-Ga2O3 are measured with polarized light in the wavelength region near its absorption edge. The crystals grown by using a Ga/HCl/O2/Ar vapor reaction system. platelike have (100), (010), (001) surfaces, major surface is (100). energies edge observed to be 4.90 eV for E//b, 4.54 E//c, 4.56 E⊥b&c at room temperature. E//b E//c 77 K larger than those temperature 40 meV 220 meV, respectively. Reflection minima 5.06 5.30 4.63
A new measurement of the branching ratio R_{e/μ}=Γ(π^{+}→e^{+}ν+π^{+}→e^{+}νγ)/Γ(π^{+}→μ^{+}ν+π^{+}→μ^{+}νγ) resulted in R_{e/μ}^{exp}=[1.2344±0.0023(stat)±0.0019(syst)]×10^{-4}. This is agreement with standard model prediction and improves test electron-muon universality to level 0.1%.
A search for massive neutrinos has been made in the decay $\pi\rightarrow e^+ \nu$. No evidence was found extra peaks positron energy spectrum indicative of pion decays involving ($\pi\rightarrow \nu_h$). Upper limits (90 \% C.L.) on neutrino mixing matrix element $|U_{ei}|^2$ mass region 60--135 MeV/$c^2$ were set, which are %representing an order magnitude improvement over previous results.
The Technical Design for the COMET Phase-I experiment is presented in this paper. an at J-PARC, Japan, which will search neutrinoless conversion of muons into electrons field aluminium nucleus ($\mu-e$ conversion, $\mu^- N \to e^- N$); a lepton flavor violating process. experimental sensitivity goal process $3.1\times10^{-15}$, or 90 % upper limit branching ratio $7\times 10^{-15}$, factor 100 improvement over existing limit. expected number background events 0.032. To achieve target and...
In the present work of PIENU experiment, heavy neutrinos were sought in pion decays π+→μ+ν at rest by examining observed muon energy spectrum for extra peaks addition to expected peak a light neutrino. No evidence was observed. Upper limits set on neutrino mixing matrix |Uμi|2 mass region 15.7–33.8 MeV/c2, improving previous results an order magnitude.
Experiment E949 at Brookhaven National Laboratory studied the rare decay \$K^+\to\pi^+\nu\bar{\nu}$ and other processes with an exposure of $1.77\times 10^{12}$ $K^+$'s. The data were analyzed using a blind analysis technique yielding one candidate event estimated background $0.30\pm0.03$ events. Combining this result observation two events by predecessor experiment E787 gave branching ratio ${\calB}(K^+\to\pi^+\nu\bar{\nu})=(1.47^{+1.30}_{-0.89})\times 10^{-10}$, consistent Standard Model...
Evidence of massive neutrinos in the ${\ensuremath{\pi}}^{+}\ensuremath{\rightarrow}{e}^{+}\ensuremath{\nu}$ decay spectrum was sought with background ${\ensuremath{\pi}}^{+}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}\ensuremath{\rightarrow}{e}^{+}$ chain highly suppressed. Upper limits (90% C.L.) on neutrino mixing matrix element $|{U}_{ei}{|}^{2}$ mass region $60--129\text{ }\text{ }\mathrm{MeV}/{c}^{2}$ were set at level ${10}^{\ensuremath{-}8}$.
We report the results of a search for decay ${K}^{+}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}\ensuremath{\nu}\overline{\ensuremath{\nu}}$ in kinematic region with ${\ensuremath{\pi}}^{+}$ momentum $140<P<195\mathrm{MeV}/c$ using data collected by E787 experiment at BNL. No events were observed. When combined our previous this region, one candidate event an expected background $1.22\ifmmode\pm\else\textpm\fi{}0.24$ 90% C.L. upper limit...
Gallium nitride was epitaxially grown on {0001} and {102} sapphire by the vapor phase reaction of Ga-HCl-NH3-Ar system. The growth rate is ∼12 µm/hr, which higher than that a factor ∼1.5. crystal {1102} has lower carrier concentration same thickness ∼0.5. lowest highest electron mobility undoped GaN obtained in this study were 1.6×1019 cm-3 78 cm2/V·s, respectively, at 300 K. When heavily doped with Mg, changes markedly morphology. orientation relationships developed an or lightly Mg-doped...
This study aimed to examine the transforming growth factor (TGF)-β signaling pathway during secondary palate fusion by transfecting single and double small interfering RNA (siRNAs) for TGF-β2 -β3. investigation also focused on understanding phenotype of palatal development. siRNAs targeting -β3 were used in an organ culture model 13-day embryonic ICR mice cultured up 72 h. The shelves collected at different times following initiation examined gene expression. Downstream was characterized...
A search for additional evidence the rare kaon decay K+-->pi(+)nunu; has been made with a new data set comparable in sensitivity to previous exposure that produced single event. No events were found pion momentum region examined, 211<P<229 MeV/c. Including reanalysis of original set, backgrounds estimated contribute 0.08+/-0.02 events. Based on one observed event, branching ratio is B(K+-->pi(+)nunu;) = 1.5(+3.4)(-1.2)x10(-10).
We observed two distinct peaks, 205-MeV/c ${\ensuremath{\pi}}^{\mathrm{\ensuremath{-}}}$ and 235-MeV/c ${\ensuremath{\mu}}^{\mathrm{\ensuremath{-}}}$, associated with ${K}_{\ensuremath{\pi}2}^{\mathrm{\ensuremath{-}}}$ ${K}_{\ensuremath{\mu}2}^{\mathrm{\ensuremath{-}}}$ decays at rest, respectively, from negative kaons stopped in liquid helium. These peaks were found to be delayed respect the stopping ${K}^{\mathrm{\ensuremath{-}}}$, showing that ${K}^{\mathrm{\ensuremath{-}}}$ mesons of...
Tellurium was found to dissolve ZnS, ZnSe, and CdS appreciable extents at elevated temperatures. Liquid solubility data for using tellurium as a solvent are presented. curves lie in orderly array, which indicates that the decreases absolute value of heat formation compound increases. The single crystals their mixed compounds grown from solution were mainly platelike. concentration examined an X-ray microanalyser.
Paramagnetic resonance measurements have been made for Ge and Pb in ZnSe at 77°K. Hyperfine structures (HFS) arising from 73 207 , superhyperfine (SHFS) Se 77 are observed. The large splittings show that the wave functions EPR centers localized on surrounding 2- ions. This indicates resonances due to holes trapped spectra photo-sensitive. photo-response of signals shows trap levels located deep forbidden energy gap.
Power upgrades of accelerators and the development new beamlines have prompted high-precision measurements to be updated reveal phenomena. Several operate in mega-watt regime, a number experiments are planned for future, search evidence physics beyond standard model by investigating events relevant secondary particles. will constructed based on concepts high-power proton drivers, i.e., meson factories. These transport particles, namely muons, with higher efficiency than conventional...
The three body pion decays ${\ensuremath{\pi}}^{+}\ensuremath{\rightarrow}{l}^{+}\ensuremath{\nu}X(l=e,\ensuremath{\mu})$, where $X$ is a weakly interacting neutral boson, were searched for using the full data set from PIENU experiment. An improved limit on $\mathrm{\ensuremath{\Gamma}}({\ensuremath{\pi}}^{+}\ensuremath{\rightarrow}{e}^{+}\ensuremath{\nu}X)/\mathrm{\ensuremath{\Gamma}}({\ensuremath{\pi}}^{+}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\nu}}_{\ensuremath{\mu}})$...
The low-frequency linear electrooptic coefficient r 41 T in semi-insulating ZnTe is measured at 10.6 µm room temperature. value (3.9±0.2)×10 -12 m/V, which only slightly smaller than that the visible region. This result seems consistent with a lattice theory on dispersion of crystals zincblende structure [D.P. Akitt et al ; IEEE J. Quantum Electronics QE-6 (1970) 496]. induced birefringence about 30 percent larger GaAs, and 35 CdTe. figure merit for material F 1 (that inversely proportional...
A new experiment searching for μ-e conversion in nuclear field by fully utilizing a high-power pulsed proton beam available at J-PARC Material and Life Science Facility is described. The muonic atom formation rate siliconcarbide primary-proton target will be 1010/s 1 MW operation of RCS booster. With this high the atoms, it possible to perform competitive search 10−14 level branching ratio, nearly two orders magnitudes below current limits. secondary line dedicated extract 105-MeV/c...