Kazuhiro Machida
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View article: Highlights from the Telescope Array experiment
Highlights from the Telescope Array experiment Open
The Telescope Array (TA) is the largest cosmic ray observatory in the Northern Hemisphere. It is designed to measure the properties of cosmic rays over a wide range of energies. TA with it's low energy extension (TALE) observe cosmic-ray i…
View article: The atmospheric transparency of Telescope Array observation site by the CLF
The atmospheric transparency of Telescope Array observation site by the CLF Open
The Telescope Array (TA) experiment continues to observe Ultra High Energy Cosmic Rays(UHECRs) both with its original TA detectors as well as with the new TAx4 expansion detectors.These observations employ Fluorescence Detectors (FDs) to c…
View article: Study on the cosmic ray intensity variation using scintillation counters for air shower observation
Study on the cosmic ray intensity variation using scintillation counters for air shower observation Open
We report a study on the conversion of a giant cosmic ray observatory for air shower observation to observe cosmic ray intensity variations caused by solar activity, anisotropy associated with interplanetary disturbances, and detection of …
View article: Anisotropy search in the Ultra High Energy Cosmic Ray Spectrum in the Northern Hemisphere using latest data obtained with Telescope Array surface detector
Anisotropy search in the Ultra High Energy Cosmic Ray Spectrum in the Northern Hemisphere using latest data obtained with Telescope Array surface detector Open
The Telescope Array (TA) experiment is located in the western desert of Utah, USA and observes ultra-high energy cosmic rays in the northern hemisphere. At the energies, the shape of the cosmic ray energy spectrum carries information of th…
View article: The measurements of the cosmic ray energy spectrum and the depth of maximum shower development of Telescope Array Hybrid trigger events
The measurements of the cosmic ray energy spectrum and the depth of maximum shower development of Telescope Array Hybrid trigger events Open
The Telescope Array experiment is an ultra-high energy cosmic ray observatory located in Millard County, Utah, USA. The observatory consists of 3 fluorescence detector (FD) stations and 507 surface detectors (SD) that cover an area of ~$70…
View article: Telescope Array search for EeV photons
Telescope Array search for EeV photons Open
We present updated results of the search for the ultra-high energy photons with primary energies greater than 10 EeV. The data of the Telescope Array Surface Detector collected over 11 years are used in this work. The method is based on th…
View article: Analysis of TAx4 hybrid trigger and events
Analysis of TAx4 hybrid trigger and events Open
'The Telescope Array is the largest ultra-high energy cosmic ray hybrid detector in the Northern hemisphere. While the TAx4 Surface Detector (TAx4 SD) has a duty cycle of ~ 100%, it should be noted that the TAx4 Fluorescence Detector (TAx4…
View article: Reconstruction of air shower events measured by the surface detectors of the TAx4 experiment
Reconstruction of air shower events measured by the surface detectors of the TAx4 experiment Open
The source, propagation and acceleration mechanism of ultra-high-energy cosmic rays (UHECR) have been investigated since the first discovery of the UHECRs to solve the mystery of the extremely high-energy universe. The Telescope Array time…
View article: UHECR mass composition from anisotropy of their arrival directions with the Telescope Array SD
UHECR mass composition from anisotropy of their arrival directions with the Telescope Array SD Open
We propose a new method for the estimation of ultra-high energy cosmic ray (UHECR) mass composition from a distribution of their arrival directions. The method employs a test statistic (TS) based on a characteristic deflection of UHECR eve…
View article: Cosmic ray energy spectrum in the 2nd knee region measured by the TALE-SD array
Cosmic ray energy spectrum in the 2nd knee region measured by the TALE-SD array Open
The Telescope Array Low energy Extension (TALE) experiment in Utah, U.S.A., consists of 10 atmospheric fluorescence telescopes and 80 Surface Detectors (SDs) spread over an area of $21~{\rm km}^2$. The SD array consists of 40 SDs at $400~\…
View article: Mass composition of Telescope Array's surface detectors events using deep learning
Mass composition of Telescope Array's surface detectors events using deep learning Open
We report on an improvement of deep learning techniques used for identifying primary particles of atmospheric air showers. The progress was achieved by using two neural networks. The first works as a classifier for individual events, while…
View article: Cosmic Ray Composition between 2 PeV and 2 EeV measured by the TALE Fluorescence Detector
Cosmic Ray Composition between 2 PeV and 2 EeV measured by the TALE Fluorescence Detector Open
The Telescope Array (TA) cosmic rays detector located in the State of Utah in the United States is the largest ultra high energy cosmic rays detector in the northern hemisphere. The Telescope Array Low Energy Extension (TALE) fluorescence …
View article: Joint analysis of the energy spectrum of ultra-high-energy cosmic rays as measured at the Pierre Auger Observatory and the Telescope Array
Joint analysis of the energy spectrum of ultra-high-energy cosmic rays as measured at the Pierre Auger Observatory and the Telescope Array Open
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View article: The UHECR dipole and quadrupole in the latest data from the original Auger and TA surface detectors
The UHECR dipole and quadrupole in the latest data from the original Auger and TA surface detectors Open
The sources of ultra-high-energy cosmic rays are still unknown, but assuming\nstandard physics, they are expected to lie within a few hundred megaparsecs\nfrom us. Indeed, over cosmological distances cosmic rays lose energy to\ninteraction…
View article: A study of analysis method for the identification of UHECR source type
A study of analysis method for the identification of UHECR source type Open
The autocorrelation analysis using the arrival direction of Ultra High Energy Cosmic Rays (UHECRs) has been previously reported by the Telescope Array (TA) experiment. It is expected that the autocorrelation function reflects the source di…
View article: Effects of Galactic magnetic field on the UHECR anisotropy studies
Effects of Galactic magnetic field on the UHECR anisotropy studies Open
Telescope Array (TA) and Auger experiments reported anisotropies in the arrival direction of ultra-high-energy cosmic rays (UHECRs). In particular, Auger Collaboration reported a correlation between UHECR events and the flux model of assum…
View article: The status of the TALE surface detector array and TALE infill project
The status of the TALE surface detector array and TALE infill project Open
Routine hybrid observations of the surface detectors (SD) in conjunction with the fluorescence detectors (FD) of the Telescope Array Low-energy Extension (TALE) began in November 2018. In this presentation, we will describe the simulation …
View article: FOV direction and image size calibration of Fluorescence Detector using light source on UAV
FOV direction and image size calibration of Fluorescence Detector using light source on UAV Open
In the Telescope Array (TA) experiment, we have been observing cosmic rays using a Fluorescence Detector (FD). More than 10 years have passed since we started this observation, and the accuracy of the observation has become more important …
View article: Cosmic Ray Energy Spectrum measured by the TALE Fluorescence Detector
Cosmic Ray Energy Spectrum measured by the TALE Fluorescence Detector Open
The Telescope Array (TA) cosmic rays detector located in the State of Utah in the United States is the largest ultra high energy cosmic rays detector in the northern hemisphere. The Telescope Array Low Energy Extension (TALE) fluorescence …
View article: Cosmic Ray Composition in the Second Knee Region as Measured by the TALE Hybrid Detector
Cosmic Ray Composition in the Second Knee Region as Measured by the TALE Hybrid Detector Open
The Telescope Array Low-energy Extension (TALE) experiment is a hybrid air shower detector for the observation of air showers induced by cosmic rays with energy above 10$^{16}$ eV. The TALE detector consists of a Fluorescence Detector (FD)…
View article: Current status and prospects of surface detector of the TAx4 experiment
Current status and prospects of surface detector of the TAx4 experiment Open
Telescope Array (TA) is the largest ultrahigh energy cosmic-ray (UHECR) observatory in the Northern Hemisphere. A surface detector (SD) array covers approximately 700 km$^2$, and the SD array is surrounded by three fluorescence detector (F…
View article: Search for point sources of ultra-high-energy photons with the Telescope Array surface detector
Search for point sources of ultra-high-energy photons with the Telescope Array surface detector Open
The surface detector (SD) of the Telescope Array (TA) experiment allows us to detect indirectly photons with energies of the order of 1018 eV and higher, and to separate photons from the cosmic ray background. In this paper, we present the…
View article: Depth of Ultra High Energy Cosmic Ray Induced Air Shower Maxima Measured by the Telescope Array Black Rock and Long Ridge FADC Fluorescence Detectors and Surface Array in Hybrid Mode
Depth of Ultra High Energy Cosmic Ray Induced Air Shower Maxima Measured by the Telescope Array Black Rock and Long Ridge FADC Fluorescence Detectors and Surface Array in Hybrid Mode Open
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