Year: 2025
Type: conference-paper
Abstract: We report on the cosmic ray mass composition measured by the Telescope Array Low-energy Extension (TALE) hybrid detector. The TALE detector began hybrid operations in 2017 after a surface detector (SD) array of 80 scintillation counters, 40 detectors with 400 m spacing and 40 with 600 m spacing, was added in front of the Middle Drum telescope station which includes 10 high-elevation fluorescence telescopes. In addition, since 2023 we have started upgraded hybrid observations adding an infill array of 50 SDs with 100\,m spacing to further reduce the energy threshold into the PeV range. In this contribution, we will present the latest cosmic ray mass composition measurement result in the energy range from $10^{15.5}$ eV to $10^{18.5}$ eV.
DOI: 10.22323/1.501.0261
Author: Keitaro Fujita
Institutions: Institute for Cosmic Ray Research, The University of Tokyo
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Funders: National Science Foundation, University of Utah, European Commission, National Research Foundation, Academia Sinica, National Research Foundation of Korea, University of Tokyo, Forskningsrådet om Hälsa, Arbetsliv och Välfärd, Ministry of Science and Higher Education of the Russian Federation, U.S. Air Force, U.S. Bureau of Land Management, Japan Society for the Promotion of Science, RIKEN, Institute for Cosmic Ray Research, University of Tokyo
Awards: G1192106470, Analysis of Data from the Telescope Array Observatory, Study of the ultra high energy cosmic ray source evolution by detailed measurement of cosmic rays in the wide energy range, Analysis of Data from the Telescope Array Observatory, G2464845396, Quest for the unified picture of the explosion mechanism of supernovae and the central engine of gamma-ray bursts, G2908002831, Search for the origin of the highest energy cosmic particles, Investigating the Correlation Between Lightning and High-Energy Particles in the Earth's Atmosphere, G5260365489, G5281852683, Downward Gamma Ray Showers from Natural Lightning, G5629441754, Operation of the Telescope Array Observatory, G6444257319, G6554715000, Exploring energy spectrum anisotropies in ultra-high energy cosmic rays with the Telescope Array, Operation of the Telescope Array Observatory, The Microphysics of Lightning: Observing the Optical Emission from Downward Terrestrial Gamma-ray Flashes, Extended Telescope Array Experiment - Nearby Extreme Universe Elucidated by Highest-energy Cosmic Rays, Baseline Support of the University of Utah Cosmic Ray Physics Group Including Analysis of Telescope Array, TALE, and TAx4 Data, Operation of the Telescope Array, TALE, and the TAx4 Expansion by the University of Utah, Extreme Phenomena in the Universe Explored by Highest Energy Cosmic Rays, Study of origins and propagation of very high energy cosmic rays with detailed measurements in the wide energy range
OpenAlex ID: W4414420593