All-particle primary energy spectrum in the 3-200 PeV energy range

Abstract

We present all-particle primary cosmic-ray energy spectrum in the 3-200 PeV energy range obtained by a multi-parametric event-by-event evaluation of the primary energy. The results are obtained on the basis of an expanded EAS data set detected at mountain level (700 g/cm^2) by the GAMMA experiment. The energy evaluation method has been developed using the EAS simulation with the SIBYLL interaction model taking into account the response of GAMMA detectors and reconstruction uncertainties of EAS parameters. Nearly unbiased (<5%) energy estimations regardless of a primary nuclear mass with an accuracy of about 15-10% in the 3-200 PeV energy range respectively are attained. An irregularity ('bump') in the spectrum is observed at primary energies of ~74 PeV. This bump exceeds a smooth power-law fit to the data by about 4 standard deviations. Not rejecting stochastic nature of the bump completely, we examined the systematic uncertainties of our methods and conclude that they cannot be responsible for the observed feature.

arXiv commentAccepted by J.Phys.G: Nucl.Part.Phys

References in corpus (9)

• KASCADE measurements of energy spectra for elemental groups of cosmic rays: Results and open problems
• Detection of a Cosmic Ray with Measured Energy Well Beyond the Expected Spectral Cutoff due to Cosmic Microwave Radiation
• The all-particle spectrum of primary cosmic rays in the wide energy range from 10^14 eV to 10^17 eV observed with the Tibet-III air-shower array
• Measurement of the Cosmic Ray Energy Spectrum and Composition from 10^{17} to 10^{18.3} eV Using a Hybrid Fluorescence Technique
• Models of the Knee in the Energy Spectrum of Cosmic Rays
• Contribution of nuclei accelerated by gamma-ray pulsars to cosmic rays in the Galaxy
• Rigidity-dependent cosmic ray energy spectra in the knee region obtained with the GAMMA experiment
• Cosmic Rays and the Monogem Supernova Remnant
• Mutually compensative pseudo solutions of primary energy spectra in the knee region

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