Features of the energy spectrum of cosmic rays above $2.5\times 10^{18}$ eV using the Pierre Auger Observatory

Abstract

We report a measurement of the energy spectrum of cosmic rays above $2.5\times 10^{18}$ eV based on $215,030$ events. New results are presented: at about $1.3\times 10^{19}$ eV, the spectral index changes from $2.51\pm 0.03\text{ (stat.)}\pm 0.05\text{ (sys.)}$ to $3.05\pm 0.05\text{ (stat.)}\pm 0.10\text{ (sys.)}$, evolving to $5.1\pm 0.3\text{ (stat.)}\pm 0.1\text{ (sys.)}$ beyond $5\times 10^{19}$ eV, while no significant dependence of spectral features on the declination is seen in the accessible range. These features of the spectrum can be reproduced in models with energy-dependent mass composition. The energy density in cosmic rays above $5\times 10^{18}$ eV is $(5.66\pm 0.03\text{ (stat.)}\pm 1.40\text{ (sys.)})\times 10^{53}$erg Mpc${}^{-3}$.

Published version; 2 figures, 1 table

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