A5046238441- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Neutrino Physics Research
- Radio Astronomy Observations and Technology
- Particle physics theoretical and experimental studies
- Gamma-ray bursts and supernovae
- Astronomy and Astrophysical Research
- Ionosphere and magnetosphere dynamics
- Atmospheric Ozone and Climate
- Lightning and Electromagnetic Phenomena
- Calibration and Measurement Techniques
- Particle Accelerators and Free-Electron Lasers
- Precipitation Measurement and Analysis
- Adaptive optics and wavefront sensing
- CCD and CMOS Imaging Sensors
- Radiation Detection and Scintillator Technologies
- Solar and Space Plasma Dynamics
- Ocean Waves and Remote Sensing
- Astronomical Observations and Instrumentation
- Infrared Target Detection Methodologies
- Radio Wave Propagation Studies
- Cyclone Separators and Fluid Dynamics
- Atmospheric aerosols and clouds
- Photocathodes and Microchannel Plates
Kanagawa University
2016-2024
Shinshu University
2024
The University of Tokyo
2013-2023
Institute of Physics, Academia Sinica
2023
Istituto Nazionale di Fisica Nucleare, Sezione di Torino
2023
Osservatorio Astrofisico di Torino
2023
National Institute for Astrophysics
2023
Kavli Institute for the Physics and Mathematics of the Universe
2021
University of Yamanashi
2020
Earthquake Engineering Research Institute
2019
The Telescope Array (TA) experiment, located in the western desert of Utah,USA, is designed for observation extensive air showers from extremely high energy cosmic rays. experiment has a surface detector array surrounded by three fluorescence detectors to enable simultaneous detection shower particles at ground level and photons along track. TA started full hybrid March, 2008. In this article we describe design technical features detector.
We have searched for intermediate-scale anisotropy in the arrival directions of ultrahigh-energy cosmic rays with energies above 57~EeV northern sky using data collected over a 5 year period by surface detector Telescope Array experiment. report on cluster events that we call hotspot, found oversampling 20$^\circ$-radius circles. The hotspot has Li-Ma statistical significance 5.1$\sigma$, and is centered at R.A.=146.7$^{\circ}$, Dec.=43.2$^{\circ}$. position about 19$^{\circ}$ off...
The Telescope Array (TA) collaboration has measured the energy spectrum of ultra-high cosmic rays with primary energies above 1.6 x 10^(18) eV. This measurement is based upon four years observation by surface detector component TA. shows a dip at an 4.6 eV and steepening 5.4 10^(19) which consistent expectation from GZK cutoff. We present results technique, new to analysis ray data, that involves generating complete simulation striking TA detector. procedure starts shower simulations using...
The Telescope Array observatory utilizes fluorescence detectors and surface to observe air showers produced by ultra high energy cosmic rays in the Earth's atmosphere. Cosmic ray events observed this way are termed hybrid data. depth of shower maximum is related mass primary particle that generates shower. This paper reports on maxima data collected over 8.5 years using Black Rock Mesa Long Ridge conjunction with array detectors. We compare means standard deviations $X_{\mathrm{max}}$...
We report on a measurement of the cosmic ray energy spectrum by Telescope Array Low-Energy Extension (TALE) air fluorescence detector. The TALE detector is also sensitive to Cherenkov light produced shower particles. Low rays, in PeV range, are detectable as "Cherenkov Events". Using these events, we measure from low $\sim 2$ an greater than 100 PeV. Above can detect rays using fluorescence. This allows for extension energies few EeV. In this paper, will describe detector, explain technique,...
Cosmic rays are energetic charged particles from extraterrestrial sources, with the highest-energy events thought to come extragalactic sources. Their arrival is infrequent, so detection requires instruments large collecting areas. In this work, we report of an extremely particle recorded by surface detector array Telescope Array experiment. We calculate particle's energy as [Formula: see text] (~40 joules). Its direction points back a void in large-scale structure Universe. Possible...
Abstract Bursts of gamma ray showers have been observed in coincidence with downward propagating negative leaders lightning flashes by the Telescope Array Surface Detector (TASD). The TASD is a 700‐km 2 cosmic observatory located southwestern Utah, USA. In data collected between 2014 and 2016, correlated observations showing structure temporal development three shower‐producing were obtained 3‐D mapping array, electric field change measurements for an additional seven flashes, both cases...
One of the uncertainties in interpretation ultrahigh energy cosmic ray data comes from hadronic interaction models used for air shower Monte Carlo (MC) simulations. The number muons observed at ground ray--induced showers is expected to depend upon model. may therefore test by comparing measured with MC prediction. In this paper, we present results studies muon densities extensive obtained analyzing signal surface detector stations which should have high purity. purity a station will on both...
In this paper we report the first close, high-resolution observations of downward-directed terrestrial gamma-ray flashes (TGFs) detected by large-area Telescope Array cosmic ray observatory, obtained in conjunction with broadband VHF interferometer and fast electric field change measurements parent discharge. The results show that TGFs occur during strong initial breakdown pulses (IBPs) few milliseconds negative cloud-to-ground low-altitude intracloud flashes, IBPs are produced a...
We study the anisotropy of Ultra-High Energy Cosmic Ray (UHECR) events collected by Telescope Array (TA) detector in first 40 months operation. Following earlier studies, we examine event sets with energy thresholds 10 EeV, and 57 EeV. find that distributions right ascension declination are compatible an isotropic distribution all three sets. then compare previously reported clustering UHECR at small angular scales. No significant is found TA data. check E>57 EeV for correlations nearby...
For the first time a proper comparison of average depth shower maximum ($X_{\rm max}$) published by Pierre Auger and Telescope Array Observatories is presented. The $X_{\rm max}$ distributions measured Observatory were fit using simulated events initiated four primaries (proton, helium, nitrogen iron). primary abundances which best describe data through (TA) Middle Drum (MD) fluorescence surface detector array. analyzed TA Collaboration same procedure as applied to their data. result version...
The results on ultrahigh-energy cosmic rays (UHECR) mass composition obtained with the Telescope Array surface detector are presented. analysis employs Boosted Decision tree (BDT) multivariate built upon 14 observables related to both properties of shower front and lateral distribution function. classifier is trained Monte-Carlo sets events induced by primary protons iron. An average atomic UHECR presented for energies $1{0}^{18.0}--1{0}^{20.0}\text{ }\text{ }\mathrm{eV}$. particles shows no...
We report on a measurement of the cosmic ray composition by Telescope Array Low-Energy Extension (TALE) air fluorescence detector (FD). By making use Cherenkov light signal in addition to from (CR) induced extensive showers, TALE FD can measure properties rays with energies as low $\sim 2$ PeV and exceeding 1 EeV. In this paper, we present results $X_{\rm max}$ distributions showers observed over energy range. Data collected period 4$ years was analyzed for study. The resulting are compared...
We search for correlations between positions of extragalactic objects and arrival directions Ultra-High Energy Cosmic Rays (UHECRs) with primary energy $E \ge 40$ EeV as observed by the surface detector array Telescope Array (TA) experiment during first 40 months operation. examined several public astronomical object catalogs, including Veron-Cetty Veron catalog active galactic nuclei. counted number TA events correlated in each a function three parameters: maximum angular separation event...
In this work we are reporting on the measurement of proton-air inelastic cross section $\sigma^{\rm inel}_{\rm p-air}$ using Telescope Array (TA) detector. Based proton-proton $\sigma_{\rm p-p}$ value is also determined at $\sqrt{s} = 95_{-8}^{+5}$ TeV. Detecting cosmic ray events ultra high energies with enables us to study fundamental parameter that otherwise unable access particle accelerators. The data used in report hybrid observed by Middle Drum fluorescence detector together surface...