A5028057357- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Methane Hydrates and Related Phenomena
- Geology and Paleoclimatology Research
- Astro and Planetary Science
- Particle Detector Development and Performance
- Astronomical Observations and Instrumentation
- Spacecraft and Cryogenic Technologies
- Ga2O3 and related materials
- Geophysics and Gravity Measurements
- Dark Matter and Cosmic Phenomena
- Semiconductor materials and devices
- Planetary Science and Exploration
- Astronomy and Astrophysical Research
- Offshore Engineering and Technologies
- Geomagnetism and Paleomagnetism Studies
- ZnO doping and properties
- Atomic and Subatomic Physics Research
- Paleontology and Stratigraphy of Fossils
- Computational Physics and Python Applications
- Polar Research and Ecology
- Interconnection Networks and Systems
- Semiconductor Lasers and Optical Devices
- Cryospheric studies and observations
Osaka University
1970-2024
University of Tsukuba
2022-2024
Kōchi University
2020-2024
Nagoya University
2013-2022
Chiba Institute of Technology
2020-2021
Saitama Prefecture
2021
United States Office of Personnel Management
2021
Sam Houston State University
2021
University of Plymouth
2021
Geological Survey of Western Australia
2021
We report the first measurement of $\ensuremath{\tau}$ lepton polarization ${P}_{\ensuremath{\tau}}({D}^{*})$ in decay $\overline{B}\ensuremath{\rightarrow}{D}^{*}{\ensuremath{\tau}}^{\ensuremath{-}}{\overline{\ensuremath{\nu}}}_{\ensuremath{\tau}}$ as well a new ratio branching fractions...
A β-(AlxGa1−x)2O3:Si/Ga2O3 modulation-doped structure was fabricated by direct β-(AlxGa1−x)2O3 epitaxial growth on a (010) β-Ga2O3 substrate. Si the order of 1018 cm−3 from adsorbed contaminants substrate surface doped into layer. The heterojunction interface exhibited confined sheet carrier density ∼3 × 1012 cm−2, which is same as that AlGaAs/GaAs. successful modulation doping for β-(AlxGa1−x)2O3/Ga2O3 heterostructure encourages development β-Ga2O3-based field-effect transistors.
Ultra-wide bandgap p-type α-(Ir,Ga)2O3 films with bandgaps of up to 4.3 eV have been obtained by unintentional doping or Mg doping. For Mg-doped films, Hall-effect measurements revealed a hole concentration 9.9 × 1018 8.1 1019 cm−3 and mobility 0.13 − 0.92 cm2/V s, respectively. A preliminary test pn junction diode composed n-type α-Ga2O3 did not show catastrophic breakdown in the reverse direction until 100 V current on/off ratio at +3 V/−3V was 5 105. Since take same crystal structure are...
Abstract Antarctica is one of the most vulnerable regions to climate change on Earth and studying past present responses this polar marine ecosystem environmental a matter urgency. Sedimentary ancient DNA ( sed aDNA) analysis can provide such insights into ecosystem-wide changes. Here we authenticated (through extensive contamination control aDNA damage analysis) metagenomic eukaryote from Scotia Sea region acquired during IODP Expedition 382. We also record ~1 Mio. years diatom chlorophyte...
Uniform periodically poled domains were demonstrated in an insulator-sandwiched structure with z-cut lithium niobate wafers for adhered ridge waveguide. Efficient quasi-phase-matched second harmonic generation was achieved a mechanically defined Strong confinement the waveguide produced second-harmonic-generation normalized conversion efficiency of 370%∕Wcm2 1.5μm wavelength region.
The γd→K+K−pn reaction has been studied to search for the evidence of Θ+ by detecting K+K− pairs at forward angles. Fermi-motion-corrected nK+ invariant mass distribution shows a narrow peak 1.524±0.002+0.003 GeV/c2. statistical significance calculated from shape analysis is 5.1 σ, and differential cross section γn→K−Θ+ estimated be 12±2 nb/sr in photon energy range 2.0 2.4 GeV LEPS angular assuming isotropic production γn center-of-mass system. obtained results support existence Θ+.9...
Differential cross sections for γp→K+Λ(1405) and γp→K+Σ0(1385) reactions have been measured in the photon energy range from 1.5 to 2.4 GeV angular of 0.8<cos(Θ)<1.0 K+ scattering angle center-of-mass system. This data is first measurement Λ(1405) photoproduction section. The line shapes Σ+π− Σ−π+ decay modes were different with each other, indicating a strong interference isospin 0 1 terms Σπ amplitudes. ratios production Σ0(1385) two ranges: near threshold (1.5<Eγ<2.0 GeV) far it...
We present the first model-independent measurement of absolute branching fraction Λ(c)(+) → pK(-)π(+) decay using a data sample 978 fb(-1) collected with Belle detector at KEKB asymmetric-energy e(+)e(-) collider. The number baryons is determined by reconstructing recoiling D((*)-) pπ(+) system in events type pπ(+)Λ(c)(+). measured to be B(Λ(c)(+) pK(-)π(+)) = (6.84 ± 0.24(-0.27)(+0.21))%, where and second uncertainties are statistical systematic, respectively.
We report results of a study doubly charmed baryons and strange baryons. The analysis is performed using $980\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ data sample collected with the Belle detector at KEKB asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider. search for ${\mathrm{\ensuremath{\Xi}}}_{cc}^{+(+)}$ ${\mathrm{\ensuremath{\Lambda}}}_{c}^{+}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}({\ensuremath{\pi}}^{+})$...
A search for $K^-pp$ bound state (the lightest kaonic nucleus) has been performed using the $\gamma d \rightarrow K^+ \pi^- \rm{X}$ reaction at E$_\gamma$=1.5-2.4 GeV LEPS/SPring-8. The differential cross section of $K^+ \pi^-$ photo-production off deuterium measured first time in this energy region, and a bump structure was searched inclusive missing mass spectrum. statistically significant not observed region from 2.22 to 2.36 GeV/$c^2$, upper limits production were determined be 0.1$-$0.7...
Abstract The Southern Ocean paleoceanography provides key insights into how iron fertilization and oceanic productivity developed through Pleistocene ice-ages their role in influencing the carbon cycle. We report a high-resolution record of dust deposition ocean for Antarctic Zone, close to main source, Patagonia. Our deep-ocean records cover last 1.5 Ma, thus doubling that from ice-cores. find 5 15-fold increase during glacials 2 5-fold biogenic silica deposition, reflecting higher...
We have investigated band discontinuities and chemical structures of Al2O3 gate insulator films on n-type GaN semiconductor by photoemission x-ray absorption spectroscopy. It is found that the solid phase epitaxy at crystal during annealing procedures 800 °C leads to transformation from amorphous crystalline. Changes in crystallographic closely correlate with significant increase conduction discontinuity Al2O3/GaN interface, which suggests epitaxial semiconductor, free grain boundaries...
Using a data sample of $980\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ ${e}^{+}{e}^{\ensuremath{-}}$ annihilation taken with the Belle detector operating at KEKB asymmetric-energy collider, we report results study excited ${\mathrm{\ensuremath{\Xi}}}_{c}$ states that decay, via emission photons and/or charged pions, into ${\mathrm{\ensuremath{\Xi}}}_{c}^{0}$ or ${\mathrm{\ensuremath{\Xi}}}_{c}^{+}$ ground state charmed-strange baryons. We present new measurements masses all members...
Charged lepton flavor violation is forbidden in the Standard Model but possible several new physics scenarios. In many of these models, radiative decays $\tau^{\pm}\rightarrow\ell^{\pm}\gamma$ ($\ell=e,\mu$) are predicted to have a sizeable probability, making them particularly interesting channels search at various experiments. An updated via using full data Belle experiment, corresponding an integrated luminosity 988 fb$^{-1}$, reported for charged violation. No significant excess over...
Abstract We report on new flavor tagging algorithms developed to determine the quark-flavor content of bottom ( "Image missing"<!-- image only, no MathML or LaTex -->) mesons at Belle II. The provide essential inputs for measurements mixing and charge-parity violation. validate evaluate performance using hadronic --> decays with flavor-specific final states reconstructed in a data set corresponding an integrated luminosity 62.8 fb $$^{-1}$$ <mml:math...
We report the discovery of ${\mathrm{\ensuremath{\Xi}}}_{c}(3055{)}^{0}$, observed by its decay into final-state $\mathrm{\ensuremath{\Lambda}}{D}^{0}$, and present first observation evidence decays ${\mathrm{\ensuremath{\Xi}}}_{c}(3055{)}^{+}$ ${\mathrm{\ensuremath{\Xi}}}_{c}(3080{)}^{+}$ $\mathrm{\ensuremath{\Lambda}}{D}^{+}$. also perform a combined analysis $\mathrm{\ensuremath{\Lambda}}{D}^{+}$ with ${\mathrm{\ensuremath{\Sigma}}}_{c}^{++}{K}^{\ensuremath{-}}$...
We report the first observation of $$\Xi _{c}(2930)^0$$ charmed-strange baryon with a significance greater than 5 $$\sigma $$ . The is found in its decay to $$K^- \Lambda _{c}^+$$ $$B^{-} \rightarrow K^{-} _{c}^{+} \bar{\Lambda }_{c}^{-}$$ decays. measured mass and width are $$[2928.9 \pm 3.0(\mathrm stat.)^{+0.9}_{-12.0}(\mathrm syst.)]$$ MeV/ $$c^{2}$$ $$[19.5 8.4(\mathrm stat.) ^{+5.9}_{-7.9}(\mathrm MeV, respectively, product branching fraction $$\mathcal{B}(B^{-} \Xi _{c}(2930)^0...
Scotia Sea and the Drake Passage is key towards understanding development of modern oceanic circulation patterns their implications for ice sheet growth decay. The sedimentary record southern basins documents regional tectonic, oceanographic climatic evolution since Eocene. However, a lack accurate age estimations has prevented calibration reconstructed history. upper was scientifically drilled first time in 2019 during International Ocean Discovery Program (IODP) Expedition 382, recovering...
We report the first observation of double strange baryon Ξ(1620)^{0} in its decay to Ξ^{-}π^{+} via Ξ_{c}^{+}→Ξ^{-}π^{+}π^{+} decays based on a 980 fb^{-1} data sample collected with Belle detector at KEKB asymmetric-energy e^{+}e^{-} collider. The mass and width are measured be 1610.4±6.0(stat)_{-4.2}^{+6.1} (syst) MeV/c^{2} 59.9±4.8(stat)_{-7.1}^{+2.8}(syst) MeV, respectively. obtain 4.0σ evidence Ξ(1690)^{0} same sample. These results shed light structure hyperon resonances strangeness S=-2.
This paper demonstrates a modulation-doped fisseld-effect transistor (MODFET) and metal-semiconductor field-effect (MESFET) using β-(AlGa)2O3 (010). Ohmic contacts on Sn-doped (Al0.15Ga0.85)2O3 exhibit fairly linear behavior, which has specific contact resistivity sheet resistance of 9 × 10−5 Ω cm2 75 kΩ/□, respectively. The MODFET with (Al0.08Ga0.92)2O3 barrier layer showed breakdown voltage 610 V for gate-drain spacing (Lgd) 8 μm, while the (Al0.16Ga0.85)2O3-channel MESFET exhibited 940...
Using data samples of 89.5 and $711\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ recorded at energies $\sqrt{s}=10.52$ 10.58 GeV, respectively, with the Belle detector KEKB ${e}^{+}{e}^{\ensuremath{-}}$ collider, we report measurements branching fractions semileptonic decays ${\mathrm{\ensuremath{\Xi}}}_{c}^{0}\ensuremath{\rightarrow}{\mathrm{\ensuremath{\Xi}}}^{\ensuremath{-}}{\ensuremath{\ell}}^{+}{\ensuremath{\nu}}_{\ensuremath{\ell}}$ ($\ensuremath{\ell}=e$ or $\ensuremath{\mu}$)...
Defective-spinel-structured γ-(AlxGa1−x)2O3 alloy films were successfully stabilized on MgAl2O4 substrates for the entire composition range using molecular beam epitaxy, though both end members are metastable. The crystallinity of (x ≥ 0.22) was considerably better than that γ-Ga2O3 film, indicating Al2O3 lattice is more flexible and sensitive to epitaxial force exerted by substrate Ga2O3 lattice. direct indirect band gaps obtained deep-UV spectroscopy in ranges 4.96–6.97 4.80–6.86 eV, which...
We measure the inclusive production cross sections of hyperons and charmed baryons from ${e}^{+}{e}^{\ensuremath{-}}$ annihilation using a $800\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ data sample taken near $\mathrm{\ensuremath{\Upsilon}}(4S)$ resonance with Belle detector at KEKB asymmetric-energy collider. The feed-down contributions heavy particles are subtracted our data, direct presented for first time. divided by number spin states $S=\ensuremath{-}1$ follow an exponential...