Constraints on the flux of primary cosmic-ray photons at energies E > 10^18 eV from Yakutsk muon data

Details Constraints on the flux of primary cosmic-ray photons at energies E > 10^18 eV from Yakutsk muon data Constraints on the flux of primary cosmic-ray photons at energies E > 10^18 eV from Yakutsk muon data

2009-07-02

arxiv.org/abs/0907.0374v2

Phys.Rev.D82:041101,2010

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

journal version, including comparison to Auger results as requested by anonymous referee

Scientific paper

10.1103/PhysRevD.82.041101

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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