We report a measurement of the energy spectrum of cosmic rays above 2.5×1018 eV based on 215 030 events. New results are presented: at about 1.3×1019 eV, the spectral index changes from 2.51±0.03(stat)±0.05(syst) to 3.05±0.05(stat)±0.10(syst), evolving to 5.1±0.3(stat)±0.1(syst) beyond 5×1019 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 5×1018 eV is [5.66±0.03(stat)±1.40(syst)]×1053 erg Mpc-3.

Aab A., Abreu P., Aglietta M., Albury J.M., Allekotte I., Almela A., et al. (2020). Features of the energy spectrum of cosmic rays above 2.5×1018 eV using the pierre auger observatory. PHYSICAL REVIEW LETTERS, 125(12) [10.1103/PhysRevLett.125.121106].

Features of the energy spectrum of cosmic rays above 2.5×1018 eV using the pierre auger observatory

Buscemi M.;Marsella G.;
2020-01-01

Abstract

We report a measurement of the energy spectrum of cosmic rays above 2.5×1018 eV based on 215 030 events. New results are presented: at about 1.3×1019 eV, the spectral index changes from 2.51±0.03(stat)±0.05(syst) to 3.05±0.05(stat)±0.10(syst), evolving to 5.1±0.3(stat)±0.1(syst) beyond 5×1019 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 5×1018 eV is [5.66±0.03(stat)±1.40(syst)]×1053 erg Mpc-3.
2020
Aab A., Abreu P., Aglietta M., Albury J.M., Allekotte I., Almela A., et al. (2020). Features of the energy spectrum of cosmic rays above 2.5×1018 eV using the pierre auger observatory. PHYSICAL REVIEW LETTERS, 125(12) [10.1103/PhysRevLett.125.121106].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/469207
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