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Muons in air showers at the Pierre Auger Observatory: Mean number in highly inclined events

A. Aab et al. (Pierre Auger Collaboration)
Phys. Rev. D 91, 032003 – Published 6 February 2015; Erratum Phys. Rev. D 91, 059901 (2015)

Abstract

We present the first hybrid measurement of the average muon number in air showers at ultrahigh energies, initiated by cosmic rays with zenith angles between 62° and 80°. The measurement is based on 174 hybrid events recorded simultaneously with the surface detector array and the fluorescence detector of the Pierre Auger Observatory. The muon number for each shower is derived by scaling a simulated reference profile of the lateral muon density distribution at the ground until it fits the data. A 1019eV shower with a zenith angle of 67°, which arrives at the surface detector array at an altitude of 1450 m above sea level, contains on average (2.68±0.04±0.48(sys))×107 muons with energies larger than 0.3 GeV. The logarithmic gain dlnNμ/dlnE of muons with increasing energy between 4×1018eV and 5×1019eV is measured to be (1.029±0.024±0.030(sys)).

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  • Received 13 August 2014
  • Corrected 24 February 2015

DOI:https://doi.org/10.1103/PhysRevD.91.032003

© 2015 American Physical Society

Corrections

24 February 2015

Erratum

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See Also

Muons in air showers at the Pierre Auger Observatory: Measurement of atmospheric production depth

A. Aab et al. (Pierre Auger Collaboration)
Phys. Rev. D 90, 012012 (2014)

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Vol. 91, Iss. 3 — 1 February 2015

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