We report a measurement of the energy spectrum of cosmic rays above 2.5×10^18 eV based on 215 030 events. New results are presented: at about 1.3×10^19 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 5×10^19 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 5×10^18 eV is [5.66±0.03(stat)±1.40(syst)]×10^53 erg Mpc^-3.
Features of the energy spectrum of cosmic rays above 2.5×1018 eV using the pierre auger observatory
Bleve C.;Coluccia M. R.;Convenga F.;De Vito E.;Epicoco I.;Mancarella G.;Martello D.;Nucita A.;Perrone L.;Savina P.;
2020-01-01
Abstract
We report a measurement of the energy spectrum of cosmic rays above 2.5×10^18 eV based on 215 030 events. New results are presented: at about 1.3×10^19 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 5×10^19 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 5×10^18 eV is [5.66±0.03(stat)±1.40(syst)]×10^53 erg Mpc^-3.File in questo prodotto:
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