Measurement of the cosmic ray energy spectrum using hybrid events of the Pierre Auger Observatory

The Pierre Auger Collaboration

Research output: Contribution to journalArticle

Abstract

The energy spectrum of ultra-high energy cosmic rays above 1018 eV is measured using the hybrid events collected by the Pierre Auger Observatory between November 2005 and September 2010. The large exposure of the Observatory allows the measurement of the main features of the energy spectrum with high statistics. Full Monte Carlo simulations of the extensive air showers (based on the CORSIKA code) and of the hybrid detector response are adopted here as an independent cross check of the standard analysis (Phys. Lett. B 685, 239 (2010)). The dependence on mass composition and other systematic uncertainties are discussed in detail and, in the full Monte Carlo approach, a region of confidence for flux measurements is defined when all the uncertainties are taken into account. An update is also reported of the energy spectrum obtained by combining the hybrid spectrum and that measured using the surface detector array.

Original languageEnglish (US)
Article number87
Pages (from-to)1-15
Number of pages15
JournalEuropean Physical Journal Plus
Volume127
Issue number8
DOIs
StatePublished - Aug 1 2012

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cosmic rays
observatories
energy spectra
detectors
cosmic ray showers
confidence
statistics
simulation
energy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Measurement of the cosmic ray energy spectrum using hybrid events of the Pierre Auger Observatory. / The Pierre Auger Collaboration.

In: European Physical Journal Plus, Vol. 127, No. 8, 87, 01.08.2012, p. 1-15.

Research output: Contribution to journalArticle

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abstract = "The energy spectrum of ultra-high energy cosmic rays above 1018 eV is measured using the hybrid events collected by the Pierre Auger Observatory between November 2005 and September 2010. The large exposure of the Observatory allows the measurement of the main features of the energy spectrum with high statistics. Full Monte Carlo simulations of the extensive air showers (based on the CORSIKA code) and of the hybrid detector response are adopted here as an independent cross check of the standard analysis (Phys. Lett. B 685, 239 (2010)). The dependence on mass composition and other systematic uncertainties are discussed in detail and, in the full Monte Carlo approach, a region of confidence for flux measurements is defined when all the uncertainties are taken into account. An update is also reported of the energy spectrum obtained by combining the hybrid spectrum and that measured using the surface detector array.",
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