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Constraints on the diffuse photon flux with energies above 10(18) eV using the surface detector of the Telescope Array experiment

Title
Constraints on the diffuse photon flux with energies above 10(18) eV using the surface detector of the Telescope Array experiment
Author
천병구
Keywords
Ultra-high-energy photons; Telescope array experiment; Extensive air showers
Issue Date
2019-07
Publisher
ELSEVIER SCIENCE BV
Citation
ASTROPARTICLE PHYSICS, v. 110, Page. 8-14
Abstract
We present the results of the search for ultra-high-energy photons with nine years of data from the Telescope Array surface detector. A multivariate classifier is built upon 16 reconstructed parameters of the extensive air shower. These parameters are related to the curvature and the width of the shower front, the steepness of the lateral distribution function, and the timing parameters of the waveforms sensitive to the shower muon content. A total number of two photon candidates found in the search is fully compatible with the expected background. The 95% CL limits on the diffuse flux of the photons with energies greater than 10(18.0), 10(18.5), 10(19.0), 10(19.5) and 10(20.0) eV are set at the level of 0.067, 0.012, 0.0036, 0.0013, 0.0013 km(-2) yr(-1) sr(-1) correspondingly. (C) 2019 Elsevier B.V. All rights reserved.
URI
https://www.sciencedirect.com/science/article/pii/S0927650518302950?via%3Dihubhttps://repository.hanyang.ac.kr/handle/20.500.11754/148370
ISSN
0927-6505; 1873-2852
DOI
10.1016/j.astropartphys.2019.03.003
Appears in Collections:
COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > PHYSICS(물리학과) > Articles
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