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Reconstruction of inclined air showers detected with the Pierre Auger Observatory
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arxiv 1407.3214 v1 pith:2WPIC2MR submitted 2014-07-11 astro-ph.HE hep-ex
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abstract
We describe the method devised to reconstruct inclined cosmic-ray air showers with zenith angles greater than $60^\circ$ detected with the surface array of the Pierre Auger Observatory. The measured signals at the ground level are fitted to muon density distributions predicted with atmospheric cascade models to obtain the relative shower size as an overall normalization parameter. The method is evaluated using simulated showers to test its performance. The energy of the cosmic rays is calibrated using a sub-sample of events reconstructed with both the fluorescence and surface array techniques. The reconstruction method described here provides the basis of complementary analyses including an independent measurement of the energy spectrum of ultra-high energy cosmic rays using very inclined events collected by the Pierre Auger Observatory.
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Cited by 2 Pith papers
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Reconstructing Air-Shower Observables using a Universality-Based Model at the Pierre Auger Observatory
astro-ph.HE 2025-07 conditional novelty 4.0 of 10
A universality-based fit to surface-detector time traces can reconstruct Xmax and muon number, giving preliminary composition results for cosmic rays above 4 EeV, though the mean Xmax scale is calibrated to fluorescence data.
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Measurement of the cosmic-ray energy spectrum above 2.5 EeV using 19 years of operation of the Pierre Auger Observatory
astro-ph.HE 2025-07 accept novelty 4.0 of 10
After 19 years of data, the combined Auger spectrum confirms the instep feature in the ultra-high-energy cosmic-ray flux at 5.5-sigma significance.
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