Measurement of the energy spectrum of cosmic rays at the highest energies using data from Pierre Auger Observatory

TL;DR

This paper presents a precise measurement of the cosmic ray energy spectrum at ultra-high energies using data from the Pierre Auger Observatory, highlighting spectral features and systematic uncertainties.

Contribution

It provides the most accurate spectrum of ultra-high-energy cosmic rays and analyzes spectral features with detailed systematic uncertainty assessment.

Findings

Identification of spectral features at energies above 1 EeV

Quantification of systematic uncertainties on spectral measurements

Enhanced precision in cosmic ray flux measurements

Abstract

We report a measurement of the flux of cosmic rays with unprecedented precision and statistics using data from the Pierre Auger Observatory. Based on fluorescence observations in coincidence with at least one station of the surface detector we derive a spectrum for energies above 1 EeV. We also report on the energy spectra obtained with the surface detector array. The spectral features are presented in detail and the impact of systematic uncertainties on these features are addressed.