A5041186644- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Radiation Detection and Scintillator Technologies
- Particle Detector Development and Performance
- Nuclear Physics and Applications
- Atomic and Subatomic Physics Research
- Superconducting Materials and Applications
- Gamma-ray bursts and supernovae
- Medical Imaging Techniques and Applications
- Particle accelerators and beam dynamics
- CCD and CMOS Imaging Sensors
- Black Holes and Theoretical Physics
- Cosmology and Gravitation Theories
- Muon and positron interactions and applications
- Particle Accelerators and Free-Electron Lasers
- Nuclear reactor physics and engineering
- Radiation Therapy and Dosimetry
- Advanced Optical Sensing Technologies
- X-ray Diffraction in Crystallography
- Solar and Space Plasma Dynamics
- Photonic and Optical Devices
Kyoto University
2015-2024
Kavli Institute for the Physics and Mathematics of the Universe
2015-2024
The University of Tokyo
2015-2024
University of Toyama
2024
Duke University
2023
University of California, Irvine
2023
Universidad Autónoma de Madrid
2023
University of Bern
2023
Albert Einstein College of Medicine
2023
Colorado State University
2023
Solar neutrino measurements from 1258 days of data the Super-Kamiokande detector are presented. The based on recoil electrons in energy range 5.0--20.0 MeV. measured solar flux is $2.32\ifmmode\pm\else\textpm\fi{}0.03(\mathrm{stat}{)}_{\ensuremath{-}0.07}^{+0.08}(\mathrm{syst})\ifmmode\times\else\texttimes\fi{}{10}^{6}{\mathrm{cm}}^{\ensuremath{-}2}{\mathrm{s}}^{\ensuremath{-}1}$, which $45.1\ifmmode\pm\else\textpm\fi{}0.5(\mathrm{stat}{)}_{\ensuremath{-}1.4}^{+1.6}(\mathrm{syst})%$ that...
The K2K experiment observes indications of neutrino oscillation: a reduction $\nu_\mu$ flux together with distortion the energy spectrum. Fifty-six beam events are observed in Super-Kamiokande (SK), 250 km from production point, an expectation $80.1^{+6.2}_{-5.4}$. Twenty-nine one ring $\mu$-like used to reconstruct spectrum, which is better matched expected spectrum oscillation than without. probability that at SK explained by statistical fluctuation without less 1%.
We present a combined analysis of fully-contained, partially-contained and upward-going muon atmospheric neutrino data from 1489 d exposure the Super-Kamiokande detector. The samples span roughly five decades in energy, 100 MeV to 10 TeV. A detailed Monte Carlo comparison is described presented. fit expectation, found be consistent with oscillations ${\ensuremath{\nu}}_{\ensuremath{\mu}}\ensuremath{\leftrightarrow}{\ensuremath{\nu}}_{\ensuremath{\tau}}$ ${sin}^{2}2\ensuremath{\theta}>0.92$...
We report the result of a search for neutrino oscillations using precise measurements recoil electron energy spectrum and zenith angle variations solar flux from 1258 days neutrino-electron scattering data in Super-Kamiokande. The absence significant variation distortion places strong constraints on mixing mass difference flux-independent way. Using Super-Kamiokande measurement addition, two allowed regions at large are found.Received 19 March...
Muon neutrino disappearance probability as a function of flight length L over energy E was studied. A dip in the L/E distribution observed data, predicted from sinusoidal flavor transition oscillation. The constrained nu_mu <-> nu_tau oscillation parameters; 1.9x10^-3 < Delta m^2 3.0x10^-3 eV^2 and \sin^2(2theta) > 0.90 at 90% confidence level.
The details of Super-Kamiokande-I’s solar neutrino analysis are given. Solar measurement in Super-Kamiokande is a high statistics collection 8B neutrinos via neutrino-electron scattering. method and results the 1496 day data sample presented. final oscillation for presented also.50 MoreReceived 30 August 2005DOI:https://doi.org/10.1103/PhysRevD.73.112001©2006 American Physical Society
The results of the second phase Super-Kamiokande solar neutrino measurement are presented and compared to first phase. flux spectrum time variation as well oscillation statistically consistent with do not show spectral distortion. time-dependent combined phases coincides full period cycle 23 shows no correlation activity. measured $^{8}\mathrm{B}$ total is...
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
Super-Kamiokande (SK) can search for weakly interacting massive particles (WIMPs) by detecting neutrinos produced from WIMP annihilations occurring inside the Sun. In this analysis, we include neutrino events with interaction vertices in detector addition to upward-going muons surrounding rock. Compared previous result, which used only, signal acceptances light (few−GeV/c2−200−GeV/c2) WIMPs are significantly increased. We fit 3903 days of SK data contribution annihilation found no...
We have searched for proton decay via $p \rightarrow e^{+} \pi^{0}$ and \mu^{+} using Super-Kamiokande data from April 1996 to March 2015, 0.306 megaton$\cdot$years exposure in total. The atmospheric neutrino background rate IV is reduced almost half that of phase I-III by tagging neutrons associated with interactions. reach the lifetime further enhanced introducing new signal criteria select a hydrogen atom. No candidates were seen search. Two passed all selection been observed, but these...
We have compared the decay rates of ${K}_{L}$ and ${K}_{S}$ to ${\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ ${\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}$ final states using a subset data from KTeV experiment (E832) at Fermilab. find that direct-CP-violation parameter $\mathrm{Re}({\ensuremath{\epsilon}}^{\ensuremath{'}}/\ensuremath{\epsilon})$ is equal...
We present the results of indirect searches for Weakly Interacting Massive Particles (WIMPs), with 1679.6 live days data from Super-Kamiokande detector using neutrino-induced upward through-going muons. The search is performed by looking an excess high energy muon neutrinos WIMP annihilations in Sun, core Earth, and Galactic Center, as compared to number expected atmospheric neutrino background. No statistically significant was seen. calculate flux limits various angular cones around each...
A search for the relic neutrinos from all past core-collapse supernovae was conducted using 1496 days of data Super-Kamiokande detector. This analysis looked electron-type antineutrinos that had produced a positron with an energy greater than 18 MeV. In absence signal, 90% C.L. upper limits on total flux were set several theoretical models; these ranged 20 to 130 macro nu(e) cm(-2) s(-1). Additionally, bound 1.2 s(-1) supernova neutrino in region E(nu)>19.3
The time variation of the elastic scattering rate solar neutrinos with electrons in Super-Kamiokande-I was fit to variations expected from active two-neutrino oscillations. best large mixing angle solution has a tan2θ=0.55 and mass squared difference Δm2=6.3×10−5eV2 between two neutrino eigenstates. fitted day-night asymmetry −1.8±1.6(stat)+1.3−1.2(syst)% improved statistical precision over previous measurements agrees well −2.1%.Received 4 September...
A new Super-Kamiokande (SK) search for Supernova Relic Neutrinos (SRNs) was conducted using 2853 live days of data. Sensitivity is now greatly improved compared to the 2003 SK result, which placed a flux limit near many theoretical predictions. This more detailed analysis includes variety improvements such as increased efficiency, lower energy threshold, and an expanded data set. New combined upper limits on SRN are between 2.8 3.0 nu_e cm^-2 s^-1 > 16 MeV total positron (17.3 E_nu).
The relative sidereal variation in the arrival direction of primary cosmic ray nuclei median energy 10 TeV was measured using downward, through-going muons detected with Super-Kamiokande-I detector. projection anisotropy map onto right ascension axis has a first harmonic amplitude $(6.64\ifmmode\pm\else\textpm\fi{}0.98\text{ }\text{ }\mathrm{stat}\ifmmode\pm\else\textpm\fi{}0.55\text{ }\mathrm{syst})\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$ and phase at maximum...
We report on the results of a three-flavor oscillation analysis using Super-Kamiokande I atmospheric neutrino data, with assumption one mass scale dominance ($\ensuremath{\Delta}{m}_{12}^{2}=0$). No significant flux change due to matter effect, which occurs when neutrinos propagate inside Earth for ${\ensuremath{\theta}}_{13}\ensuremath{\ne}0$, has been seen either in multi-GeV ${\ensuremath{\nu}}_{e}$-rich sample or ${\ensuremath{\nu}}_{\ensuremath{\mu}}$-rich sample. Both normal and...
The result of a search for neutrino bursts from supernova explosions using the Super-Kamiokande detector is reported. sensitive to core-collapse via observation their emissions. expected number events comprising such burst ~10^4 and average energy neutrinos in few tens MeV range case explosion at typical distance our galaxy (10 kiloparsecs); this large signal means that detection efficiency anywhere within well past Magellanic Clouds 100%. We examined data set which was taken May, 1996 July,...
Are there more than three types of neutrinos in nature ? Some experiments show that should exist at least one type, called sterile neutrinos. Using atmospheric neutrino data from the Super-Kamiokande experiment, authors find new limits on oscillations.
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$^{-1}$...
We have searched for proton decay via $p \rightarrow \nu K^{+}$ using Super-Kamiokande data from April 1996 to February 2013, 260 kiloton$\cdot$year exposure in total. No evidence this mode is found. A lower limit of the lifetime set $5.9 \times 10^{33}$ years at 90% confidence level.