A5089538393- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Quantum Chromodynamics and Particle Interactions
- Dark Matter and Cosmic Phenomena
- Astrophysics and Cosmic Phenomena
- Neutrino Physics Research
- Computational Physics and Python Applications
- Cosmology and Gravitation Theories
- Radiation Detection and Scintillator Technologies
- Solar and Space Plasma Dynamics
- Particle Accelerators and Free-Electron Lasers
- Radiation Therapy and Dosimetry
- Gamma-ray bursts and supernovae
- Radio Astronomy Observations and Technology
- Nuclear Physics and Applications
- Atomic and Subatomic Physics Research
- Superconducting Materials and Applications
- Medical Imaging Techniques and Applications
- Distributed and Parallel Computing Systems
- Ionosphere and magnetosphere dynamics
- Pulsars and Gravitational Waves Research
- Radioactivity and Radon Measurements
- Natural Language Processing Techniques
- Astro and Planetary Science
Osaka University
2017-2025
Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
2023-2024
Istituto Nazionale di Fisica Nucleare, Gruppo Collegato di Udine
2023-2024
Hirosaki University
2013-2024
Toneyama National Hospital
2024
The Abdus Salam International Centre for Theoretical Physics (ICTP)
2023-2024
University of Göttingen
2020-2024
Atlas Scientific (United States)
2024
A. Alikhanyan National Laboratory
2024
SR Research (Canada)
2024
We report, for the first time, long-awaited detection of diffuse gamma rays with energies between 100 TeV and 1 PeV in Galactic disk. Particularly, all above 398 are observed apart from known gamma-ray sources compatible expectations hadronic emission scenario which originate decay $π^0$'s produced through interaction protons interstellar medium Galaxy. This is strong evidence that cosmic accelerated beyond our Galaxy spread over
We report on the highest energy photons from Crab Nebula observed by Tibet air shower array with underground water-Cherenkov-type muon detector array. Based criterion of a number measured in an shower, we successfully suppress 99.92% cosmic-ray background events energies E>100 TeV. As result, 24 photonlike TeV against 5.5 events, which corresponds to 5.6σ statistical significance. This is first detection astrophysical source.
A search for the rare decay K_{L}→π^{0}νν[over ¯] was performed. With data collected in 2015, corresponding to 2.2×10^{19} protons on target, a single event sensitivity of (1.30±0.01_{stat}±0.14_{syst})×10^{-9} achieved and no candidate events were observed. We set an upper limit 3.0×10^{-9} branching fraction at 90% confidence level (C.L.), which improved previous by almost order magnitude. An K_{L}→π^{0}X^{0} also as 2.4×10^{-9} C.L., where X^{0} is invisible boson with mass 135 MeV/c^{2}.
The intensity of Galactic cosmic rays is nearly isotropic because the influence magnetic fields in Milky Way. Here, we present two-dimensional high-precision anisotropy measurement for energies from a few to several hundred teraelectronvolts (TeV), using large data sample Tibet Air Shower Arrays. Besides revealing finer details known anisotropies, new component ray sidereal time uncovered around Cygnus region direction. For cosmic-ray up TeV, all components anisotropies fade away, showing...
We present an updated all-particle energy spectrum of primary cosmic rays in a wide range from 1014 to 1017 eV using 5.5 × 107 events collected 2000 November through 2004 October by the Tibet-III air-shower array located 4300 m above sea level (an atmospheric depth 606 g cm−2). The size exhibits sharp knee at corresponding around 4 PeV. This work uses increased statistics and new simulation calculations for analysis. discuss our extensive Monte Carlo model dependencies involved final result,...
Abstract Kaon physics is at a turning point – while the rare-kaon experiments NA62 and KOTO are in full swing, end of their lifetime approaching future experimental landscape needs to be defined. With HIKE, KOTO-II LHCb-Phase-II on table under scrutiny, it very good moment time take stock contemplate about opportunities these theoretical developments provide for particle coming decade beyond. This paper provides compact summary talks discussions from Kaons@CERN 2023 workshop, held September CERN.
This is a full report on the cosmic-ray spectra and composition obtained by emulsion chambers board 10 long-duration balloons, launched from Kamchatka between 1995 1999. The total exposure of these campaigns amounts to 575 m2 hr, with an average flight altitude ~32 km. We present final results energy two light elements, protons helium nuclei, those three heavy-element groups, CNO, NeMgSi, Fe, covering very high region 10-1000 TeV particle-1. additionally secondary/primary ratio, all-particle...
We present the large-scale sidereal anisotropy ofgalactic cosmic-ray intensity in multi-TeV region observed with Tibet-IIIair shower array during period from 1999 through 2003. The daily variation of cosmic rays this experiment shows an excess relative around $4\sim7 $ hours local time, as well a deficit 12 time. While amplitude is not significant when averaged over all declinations, individual declinaton bands becomes larger and clearer viewing direction moves toward south. maximum phase...
The first dedicated search for the rare neutral-kaon decay $K_L^0\to\pi^0\nu\bar{\nu}$ has been carried out in E391a experiment at KEK 12-GeV proton synchrotron. final upper limit of 2.6 $\times 10^{-8}$ 90% confidence level was set on branching ratio decay.
Abstract We report on the analysis of 10–1000 TeV large-scale sidereal anisotropy Galactic cosmic rays (GCRs) with data collected by Tibet Air Shower Array from 1995 October to 2010 February. In this analysis, we improve energy estimate and extend decl. range down −30°. find that maps above 100 are distinct at a multi-TeV band. The so-called tail-in loss-cone features identified low energies get less significant, new component appears ∼100 TeV. spatial distribution GCR intensity an excess...
The KOTO collaboration has now carefully analyzed widely discussed preliminary data containing four signal events for a rare kaon decay---an excess suggesting physics beyond the Standard Model---and found that Model background are large enough to explain signal.
view Abstract Citations (85) References (25) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Cosmic-Ray Energy Spectrum between 10 14.5 and 16.3 eV Covering the ``Knee'' Region Amenomori, M. ; Cao, Z. Dai, B. Ding, L. K. Feng, Y. X. Hibino, Hotta, N. Huang, Q. Huo, A. Jia, H. Jiang, G. Jiao, S. Kajino, F. Kasahara, Labaciren Liu, Mei, D. Meng, R. Mimaciren Mizutani, Mu, J. Nanjo, Nishizawa, Ohnishi, Ohta, I. Ouchi, T. Ren, Saito, To. Sakata, Shi, Shibata,...
The Tibet-III air shower array, consisting of 533 scintillation detectors, has been operating successfully at Yangbajing in Tibet, China since 1999. Using the data set collected by this array from 1999 November through 2005 November, we obtained energy spectrum γ-rays Crab Nebula, expressed a power law as (dJ/dE) = (2.09 ± 0.32) × 10−12(E/3 TeV)−2.96±0.14 cm−2 s−1 TeV−1 range 1.7–40 TeV. This result is consistent with other independent γ-ray observations imaging Cherenkov telescopes. In...
We systematically investigate the new experimental method of using atoms or molecules to measure important parameters neutrinos that are still be determined: absolute mass scale, hierarchy pattern (normal inverted), neutrino type (Majorana Dirac), and CP-violating phases, including Majorana phases. Most these observables difficult in oscillation experiments. There advantages atomic targets, such as closeness available energies anticipated masses, over nuclear target experiments end point...
We report on a clear solar-cycle variation of the Sun's shadow in 10 TeV cosmic-ray flux observed by Tibet air shower array during full solar cycle from 1996 to 2009. In order clarify physical implications variation, we develop numerical simulations shadow, using potential field source surface model and current sheet (CSSS) for coronal magnetic field. find that intensity deficit simulated is very sensitive structure, better reproduced CSSS model. This first successful attempt evaluate models flux.
The KOTO II is a next-generation experiment to measure the branching ratio of $K_L\to \pi^0\nu\bar{\nu}$ with 30-GeV proton beam at J-PARC. successor currently running experiment. We plan expand hadron experimental facility J-PARC, and construct new beamline there. extraction angle $K_L$ 5 degrees, smaller than that in have more harder momentum spectrum. detector being designed 12-m signal decay region 3-m diameter calorimeter acceptance. expected numbers background events are 35 40,...
We performed a search for the <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:msub><a:mi>K</a:mi><a:mi>L</a:mi></a:msub><a:mo stretchy="false">→</a:mo><a:msup><a:mi>π</a:mi><a:mn>0</a:mn></a:msup><a:mi>ν</a:mi><a:mover accent="true"><a:mi>ν</a:mi><a:mo stretchy="false">¯</a:mo></a:mover></a:math> decay using data taken in 2021 at J-PARC KOTO experiment. With newly installed counters and new analysis method, expected background was suppressed to <f:math...
Results on steady TeV $\gamma$-ray point source search using data taken from the Tibet HD (Feb. 1997 -- Sep. 1999) and III (Nov. 1999 Oct. 2001) arrays are presented. From $0^{\circ}$ to $60^{\circ}$ in declination, significant excesses well-known Crab Nebula high state of flare type Markarian 421 observed. Because levels significance other positions not sufficiently high, 90% confidence level upper limits flux set assuming different power law spectra. To allow crosschecking, two...
The Tibet air shower array at an altitude of 4300 m has been in operation since January 1990. We have searched for continual emission 10-TeV gamma rays from the Crab Nebula, Cygnus X-3 and Hercules X-1 during period June 1990 through 1992. No dc excess is found these three sources. Flux upper limits above 10 TeV are obtained to be 1.2×10−12 cm−2 s−1 1.1×10−12 cm−2s−1 X-3, 0.58×10−12 95% C.L. This first observation, with array, sources energy region.Received 11...
Several strong TeV γ-ray flares were detected from Mrk 421 in the years 2000 and 2001 by Tibet III air shower array at a level of statistical significance 5.1 σ. was unprecedentedly active X-ray energies during this period, positive correlation found between change all-sky monitor Rossi X-Ray Timing Explorer flux flux. When power-law energy spectrum for γ-rays source is assumed, spectral index calculated to be -3.24 ± 0.69 most phase 2001. The observed consistent with those obtained via...
Abstract The KOTO II experiment at J-PARC is a next-generation that under design aiming the measurement of branching ratio <?CDATA ${K}_{L}\to {\pi }^{0}\nu \bar{\nu }$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mi>K</mml:mi> <mml:mi>L</mml:mi> </mml:msub> <mml:mo>→</mml:mo> <mml:msup> <mml:mi>π</mml:mi> <mml:mn>0</mml:mn> </mml:msup> <mml:mi>ν</mml:mi> <mml:mover> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> decay. planned in extended Hadron...