F. Suekane
A5049949568- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Quantum Chromodynamics and Particle Interactions
- Astrophysics and Cosmic Phenomena
- High-Energy Particle Collisions Research
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Radiation Detection and Scintillator Technologies
- Atomic and Subatomic Physics Research
- Nuclear Physics and Applications
- Particle Accelerators and Free-Electron Lasers
- Nuclear physics research studies
- Medical Imaging Techniques and Applications
- Superconducting Materials and Applications
- Particle accelerators and beam dynamics
- Muon and positron interactions and applications
- Quantum, superfluid, helium dynamics
- Nuclear reactor physics and engineering
- Advanced NMR Techniques and Applications
- Atmospheric Ozone and Climate
- Quantum Mechanics and Applications
- Computational Physics and Python Applications
- Spectroscopy and Laser Applications
- CCD and CMOS Imaging Sensors
- Atomic and Molecular Physics
Tohoku University
2016-2025
High Energy Accelerator Research Organization
1986-2023
Osaka University
2023
Seoul National University of Science and Technology
2023
Laboratoire AstroParticule et Cosmologie
2018-2022
Tohoku Gakuin University
2002-2022
Ann Arbor Center for Independent Living
2021
Springer Nature (Germany)
2021
Université Paris Cité
2018
Centre National de la Recherche Scientifique
2018
KamLAND has measured the flux of nu;(e)'s from distant nuclear reactors. We find fewer nu;(e) events than expected standard assumptions about propagation at 99.95% C.L. In a 162 ton.yr exposure ratio observed inverse beta-decay to number without disappearance is 0.611+/-0.085(stat)+/-0.041(syst) for energies >3.4 MeV. context two-flavor neutrino oscillations with CPT invariance, all solutions solar problem except "large mixing angle" region are excluded.
We present results of a study neutrino oscillation based on 766 ton-year exposure KamLAND to reactor anti-neutrinos. observe 258 \nuebar\ candidate events with energies above 3.4 MeV compared 365.2 expected in the absence oscillation. Accounting for 17.8 background events, statistical significance \nuebar disappearance is 99.998%. The observed energy spectrum disagrees spectral shape at 99.6% and prefers distortion from effects. A two-neutrino analysis data gives \DeltaMSq =...
The KamLAND experiment has determined a precise value for the neutrino oscillation parameter Deltam21(2) and stringent constraints on theta12. exposure to nuclear reactor antineutrinos is increased almost fourfold over previous results 2.44 x 10(32) proton yr due longer livetime an enlarged fiducial volume. An undistorted nu[over]e energy spectrum now rejected at >5sigma. Analysis of above inverse beta decay threshold, including geoneutrinos, gives best fit...
Measurements are reported of the proton and deuteron spin structure functions ${g}_{1}^{p}$ ${g}_{1}^{d}$ at beam energies 29.1, 16.2, 9.7 GeV, ${g}_{2}^{p}$ ${g}_{2}^{d}$ a energy 29.1 GeV. The integrals ${\ensuremath{\Gamma}}_{p}={\ensuremath{\int}}_{0}^{1}{g}_{1}^{p}{(x,Q}^{2})dx$ ${\ensuremath{\Gamma}}_{d}={\ensuremath{\int}}_{0}^{1}{g}_{1}^{d}{(x,Q}^{2})dx$ were evaluated fixed ${Q}^{2}=3(\mathrm{GeV}{/c)}^{2}$ using full data set to yield...
We present new constraints on the neutrino oscillation parameters $/textyen Delta m^{2}_{21}$, theta_{12}$, and theta_{13}$ from a three-flavor analysis of solar KamLAND data. The data set includes acquired following radiopurity upgrade amounts to total exposure $3.49 \textyen times 10^{32}$ target-proton-year. Under assumption {\textyen it CPT} invariance, two-flavor (/textyen mbox{$\textyen theta_{13} = 0$}) yields best-fit values $\textyen tan^{2} theta_{12} 0.444^{+0.036}_{-0.030}$...
We report on a precision measurement of the neutron spin structure function ${g}_{1}^{n}$ using deep inelastic scattering polarized electrons by ${}^{3}\mathrm{He}$. For kinematic range $0.014<x<0.7$ and $1<{Q}^{2}<17(\mathrm{GeV}/c{)}^{2}$, we obtain $\ensuremath{\int}{0.014}^{0.7}{g}_{1}^{n}(x)dx\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}\ensuremath{-}0.036\ifmmode\pm\else\textpm\fi{}0.004(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.005(\mathrm{syst})$ at an average...
We have measured the ratio $\frac{{g}_{1}^{p}}{{F}_{1}^{p}}$ over range $0.029<x<0.8$ and $1.3<{Q}^{2}<10$ ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^{2}$ using deep-inelastic scattering of polarized electrons from ammonia. An evaluation integral $\ensuremath{\int}{0}^{1}{g}_{1}^{p}(x, {Q}^{2})\mathrm{dx}$ at fixed ${Q}^{2}=3$ yields 0.127\ifmmode\pm\else\textpm\fi{}0.004(stat)\ifmmode\pm\else\textpm\fi{}0.010(syst), in agreement with previous experiments, but well below Ellis-Jaffe sum...
We report on a high-statistics measurement of the deuteron spin structure function ${g}_{1}^{d}$ at beam energy 29 GeV in kinematic range $0.029<x<0.8$ and $1<{Q}^{2}<10$ (GeV $/c$${)}^{2}$. The integral ${\ensuremath{\gamma}}_{1}^{d}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}\ensuremath{\int}{1}^{}{g}_{1}^{d}\mathrm{dx}$ evaluated fixed ${Q}^{2}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}3$ $/c$${)}^{2}$ gives...
Radioactive isotopes produced through cosmic muon spallation are a background for rare-event detection in $\nu$ detectors, double-$\beta$-decay experiments, and dark-matter searches. Understanding the nature of cosmogenic backgrounds is particularly important future experiments aiming to determine pep CNO solar neutrino fluxes, which dominated by production $^{11}$C. Data from Kamioka liquid-scintillator antineutrino detector (KamLAND) provides valuable information better understanding these...
We present the results of a search for extraterrestrial electron antineutrinos ('s) in energy range using KamLAND detector. In an exposure 4.53 kton-year, we identify 25 candidate events. All events can be attributed to background, most importantly neutral current atmospheric neutrino interactions, setting upper limit on probability 8B solar νe's converting into 's at 5.3 × 10−5 (90% CL), if assume undistorted shape. This corresponds flux 93 cm−2 s−1 or event rate 1.6 (kton − year)−1 above...
We have measured proton and deuteron virtual photon-nucleon asymmetries ${A}_{2}^{p}$ ${A}_{2}^{d}$ structure functions ${g}_{2}^{p}$ ${g}_{2}^{d}$ over the range $0.03<x<0.8$ $1.3<{Q}^{2}<10(\mathrm{GeV}/c{)}^{2}$ by inelastically scattering polarized electrons off ammonia targets. Results for ${A}_{2}$ are significantly smaller than positivity limit $\sqrt{R}$ both Within experimental precision ${g}_{2}$ data well described twist-2 contribution, ${g}_{2}^{\mathrm{WW}}$. Twist-3 matrix...
The possibility of measuring ${\mathrm{sin}}^{2}2{\ensuremath{\theta}}_{13}$ using reactor neutrinos is examined in detail. It shown that the sensitivity ${\mathrm{sin}}^{2}2{\ensuremath{\theta}}_{13}>0.02$ can be reached with 40 ton yr data by placing identical CHOOZ-like detectors at near and far distances from a giant nuclear power plant whose total thermal energy $24.3{\mathrm{GW}}_{\mathrm{th}}.$ emphasized this measurement free parameter degeneracies occur accelerator appearance...
This paper describes the design, construction, and initial operation of SLD's upgraded vertex detector which comprises 96 two-dimensional charge-coupled devices (CCDs) with a total 307 Mpixel. Each pixel functions as an independent particle detecting element, providing space point measurements charged tracks typical precision 4 μm in each co-ordinate. The CCDs are arranged three concentric cylinders just outside beam-pipe surrounds e+e− collision SLAC Linear Collider (SLC). is powerful tool...
Data corresponding to a KamLAND detector exposure of 0.28 kton yr has been used search for nu;(e)'s in the energy range 8.3<E(nu;(e))<14.8 MeV. No candidates were found an expected background 1.1+/-0.4 events. This result can be obtain limit on nu;(e) fluxes any origin. Assuming that all flux its origin Sun and characteristic 8B solar nu(e) spectrum, we upper 3.7 x 10(2) cm(-2) s(-1) (90% C.L.) flux. We interpret this limit, 2.8 10(-4) standard model flux, framework spin-flavor precession...
We report a measurement of the neutrino-electron elastic scattering rate from ${}^{8}$B solar neutrinos based on 123 kton-day exposure KamLAND. The background-subtracted electron recoil rate, above 5.5-MeV analysis threshold is 1.49 $\ifmmode\pm\else\textpm\fi{}$ 0.14(stat) 0.17(syst) events per kton-day. Interpreted as due to pure flavor flux with neutrino spectrum, this corresponds spectrum integrated 2.77 0.26(stat) 0.32(syst) $\ifmmode\times\else\texttimes\fi{}$10${}^{6}$...
Abstract JSNS2 (J-PARC Sterile Neutrino Search at J-PARC Spallation Neutron Source) is an experiment that searching for sterile neutrinos via the observation of $\bar{\nu }_{\mu } \rightarrow \bar{\nu }_e$ appearance oscillations using with muon decay-at-rest. For this search, rejecting cosmic-ray-induced neutron events by Pulse Shape Discrimination (PSD) essential because detector located above ground, on third floor building. We have achieved 94.95±0.15% rejection while keeping 92.82±1.77%...
We present the first measurement of missing energy due to nuclear effects in monoenergetic, muon neutrino charged-current interactions on carbon, originating from <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:msup><a:mrow><a:mi>K</a:mi></a:mrow><a:mrow><a:mo>+</a:mo></a:mrow></a:msup><a:mo...
We show that antineutrino $({\overline{v}}_{e})$ spectroscopy in upcoming detectors Italy and Japan can be used to measure the separate global abundances of ${}^{238}\mathrm{U}$ ${}^{232}\mathrm{Th}$, thus $\ensuremath{\sim}90%$ radiogenic heat Earth. Exploiting unique advantage their contrasting geological locations, they may also probe differences U,Th areal densities continental oceanic crusts mantle. Bearing directly on interior whole Earth, such data test, for first time, conceptual...