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Constraints on the flux of primary cosmic-ray photons at energies E>1018eV from Yakutsk muon data

A. V. Glushkov, I. T. Makarov, M. I. Pravdin, I. E. Sleptsov, D. S. Gorbunov, G. I. Rubtsov, and S. V. Troitsky (Yakutsk EAS Array)
Phys. Rev. D 82, 041101(R) – Published 31 August 2010

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>1018eV, E>2×1018eV, and E>4×1018eV. The large collected statistics of the showers measured by large-area muon detectors provides a sensitivity to photon fractions <102, thus achieving precision previously unreachable at ultrahigh energies.

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  • Received 15 July 2009

DOI:https://doi.org/10.1103/PhysRevD.82.041101

© 2010 The American Physical Society

Authors & Affiliations

A. V. Glushkov, I. T. Makarov, M. I. Pravdin, and I. E. Sleptsov (Yakutsk EAS Array)

  • Yu. G. Shafer Institute of Cosmophysical Research and Aeronomy, Yakutsk 677980, Russia

D. S. Gorbunov, G. I. Rubtsov, and S. V. Troitsky

  • Institute for Nuclear Research of RAS, 60th October Anniversary Prospect 7a, Moscow 117312, Russia

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Issue

Vol. 82, Iss. 4 — 15 August 2010

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