Y. Watanabe
A5055066996- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Neutrino Physics Research
- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Nuclear physics research studies
- Particle Detector Development and Performance
- Particle Accelerators and Free-Electron Lasers
- Atomic and Subatomic Physics Research
- Computational Physics and Python Applications
- Radiation Detection and Scintillator Technologies
- Superconducting Materials and Applications
- Topological Materials and Phenomena
- Cosmology and Gravitation Theories
- Magnetic properties of thin films
- Medical Imaging Techniques and Applications
- Black Holes and Theoretical Physics
- Atomic and Molecular Physics
- Advanced Condensed Matter Physics
- Magnetic Properties of Alloys
- CO2 Sequestration and Geologic Interactions
- Hydraulic Fracturing and Reservoir Analysis
- Inertial Sensor and Navigation
- Nuclear Physics and Applications
Osaka University
1991-2025
The University of Tokyo
2001-2024
Tokyo Institute of Technology
2001-2024
Chuo University
2002-2024
Tohoku University
2005-2024
Tokyo University of Science
1995-2024
PHENIX laboratory
2022
Bhabha Atomic Research Centre
2022
Banaras Hindu University
2022
Augustana University
2022
The results of the third phase Super-Kamiokande solar neutrino measurement are presented and compared to first second results. With improved detector calibrations, a full simulation, analysis methods, systematic uncertainty on total flux is estimated be ?2.1%, which about two thirds for Super-Kamiokande. observed 8B in 5.0 20 MeV electron energy region 2.32+/-0.04 (stat.)+/-0.05 (sys.) *10^6 cm^-2sec^-1, agreement with previous measurements. A combined oscillation carried out using SK-I, II,...
We present a search for non-zero theta_{13} and deviations of sin^2 theta_{23} from 0.5 in the oscillations atmospheric neutrino data Super-Kamiokande -I, -II, -III. No distortions flux consistent with are found both mass hierarchy hypotheses agreement data. The best fit at Delta m^2 = 2.1 x 10^-3 eV^2, 0.0, =0.5. In normal (inverted) constrained one-dimensional 90% C.L. to < 0.04 (0.09) 1.9 (1.7) 2.6 (2.7) eV^2. mixing angle is within 0.407 <= 0.583
We present the result of an indirect search for high energy neutrinos from WIMP annihilation in Sun using upward-going muon (upmu) events at Super-Kamiokande. Datasets SKI-SKIII (3109.6 days) were used analysis. looked excess neutrino signal as compared with expected atmospheric background three upmu categories: stopping, non-showering, and showering. No significant was observed. The 90% C.L. upper limits flux induced by WIMPs 100 GeV/c$^2$ 6.4$\times10^{-15}$ cm$^{-2}$ sec$^{-1}$...
In this paper we study non-standard neutrino interactions as an example of physics beyond the standard model using atmospheric data collected during Super-Kamiokande I(1996-2001) and II(2003-2005) periods. We focus on flavor-changing-neutral-currents (FCNC), which allow flavor transitions via neutral current interactions, effects violate lepton non-universality (NU) give rise to different neutral-current interaction-amplitudes for flavors. obtain a limit FCNC coupling parameter,...
Searches for a nucleon decay into charged antilepton (e+ or μ+) plus light meson (π0, π−, η, ρ0, ρ−, ω) were performed using the Super-Kamiokande I and II data. Twelve modes searched for. The total exposure is 140.9 kiloton⋅years, which includes 91.7 kiloton⋅year (1489.2 live days) of Super-Kamiokande-I 49.2 (798.6 II. number candidate events in data was consistent with atmospheric neutrino background expectation. No significant evidence observed Thus, lower limits on partial lifetime at 90%...
An enhanced geothermal system using carbon dioxide (CO2) for both reservoir creation and thermal energy extraction has attracted attention; however, studies on the CO2 fracturing of volcanic rocks under conditions are lacking. This study aimed to elucidate characteristics processes in via integrated lab-scale experiments numerical simulations basalt andesite at 250°C a confining pressure 30 MPa. Moreover, it proposed demonstrated an efficient CO2-based method based obtained insights....
Searching for an ideal magnetic Weyl semimetal hosting only a single pair of points has been focal point systematic clarification its unique magnetotransport derived from the interplay between topology and magnetization. Among candidates, triangular-lattice antiferromagnet EuCd2As2 attracting special attention due to prediction phase in ferromagnetic state; however, transport properties low-carrier density samples have remained elusive. Here, we report molecular beam epitaxy growth films,...
Here we study nonmonotonic features which appear both in magnetoresistivity and anomalous Hall resistivity during the simple magnetization process, by systematically measuring type-II magnetic Weyl semimetal EuCd$_2$Sb$_2$ films over a wide carrier density range. We find that positive hump can be explained as manifestation of field-linear term generalized magnetoconductivity formula including Berry curvature. As also confirmed model calculation, negative pronounced near point energy case...
Excitation spectra of $^{11}\mathrm{C}$ are measured in the $^{12}\mathrm{C}(p,d)$ reaction near ${\ensuremath{\eta}}^{\ensuremath{'}}$ emission threshold. A proton beam extracted from synchrotron SIS-18 at GSI with an incident energy 2.5 GeV impinges on a carbon target. The momenta deuterons emitted 0\ifmmode^\circ\else\textdegree\fi{} precisely fragment separator (FRS) operated as spectrometer. In contrast to theoretical predictions possible existence deeply bound...
Excitation-energy spectra of $^{11}\mathrm{C}$ nuclei near the ${\ensuremath{\eta}}^{\ensuremath{'}}$-meson production threshold have been measured by missing-mass spectroscopy using $^{12}\mathrm{C}(p,d)$ reaction. A carbon target has irradiated with a 2.5 GeV proton beam supplied synchrotron SIS-18 at GSI to produce bound states in nuclei. Deuterons emitted ${0}^{\ensuremath{\circ}}$ reaction momentum analyzed fragment separator (FRS), used as high-resolution spectrometer. No distinct...
We have found a long-lived metastable state of stopped ${\mathrm{\ensuremath{\pi}}}^{\mathrm{\ensuremath{-}}}$ in liquid helium by measuring the time spectra two different delayed products: (i) protons emitted after absorption $^{4}\mathrm{He}$ nuclei and (ii) 70-MeV electrons originating from free ${\mathrm{\ensuremath{\pi}}}^{\mathrm{\ensuremath{-}}}$\ensuremath{\rightarrow}${\mathit{e}}^{\mathrm{\ensuremath{-}}}$${\ensuremath{\nu}}_{\mathit{e}}$\ifmmode\bar\else\textasciimacron\fi{}...
We observed the atomic $1s$ and $2p$ states of $\pi^-$ bound to ${}^{121}{\rm Sn}$ nuclei as distinct peak structures in missing mass spectra ${}^{122}{\rm Sn}(d,{}^3{\rm He})$ nuclear reaction. A very intense deuteron beam a spectrometer with large angular acceptance let us achieve potential discovery, which includes capability determining angle-dependent cross sections high statistics. The state Sn nucleus was for first time. binding energies widths pionic are determined found be...