Telescope Array reports upper limits on EeV photon flux of <2.3e-3 above 10^19 eV and <3.0e-4 above 10^20 eV using a neural network classifier fine-tuned on experimental data.
Constraints on the flux of primary cosmic-ray photons at energies E > 10^18 eV from Yakutsk muon data
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abstract
Comparing the signals measured by the surface and underground scintillator detectors of the Yakutsk Extensive Air Shower Array, we place upper limits on the integral flux and the fraction of primary cosmic-ray photons with energies E > 10^18 eV, E > 2*10^18 eV and E > 4*10^18 eV. The large collected statistics of the showers measured by large-area muon detectors provides a sensitivity to photon fractions < 10^-2, thus achieving precision previously unreachable at ultra-high energies.
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Searching for EeV photons with Telescope Array Surface Detector and neural networks
Telescope Array reports upper limits on EeV photon flux of <2.3e-3 above 10^19 eV and <3.0e-4 above 10^20 eV using a neural network classifier fine-tuned on experimental data.