Features of the energy spectrum of cosmic rays above 2.5 × 10 18 eV using the Pierre Auger Observatory.
AAB, A.; ARBELETCHE, Luan Bonneau; CATALANI, Fernando; SOUZA, Vitor de; LANG, Rodrigo Guedes; MARTÍNEZ-HUERTA, Humberto; ARMAND, Johnnier Pérez; CARVALHO JUNIOR, Washington Rodrigues de; SANTOS, Edivaldo Moura; PEIXOTO, Carlos Jose Todero.
AAB, A.; ARBELETCHE, Luan Bonneau; CATALANI, Fernando; SOUZA, Vitor de; LANG, Rodrigo Guedes; MARTÍNEZ-HUERTA, Humberto; ARMAND, Johnnier Pérez; CARVALHO JUNIOR, Washington Rodrigues de; SANTOS, Edivaldo Moura; PEIXOTO, Carlos Jose Todero.
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 .
@article={003006575,author = {AAB, A.; ARBELETCHE, Luan Bonneau; CATALANI, Fernando; SOUZA, Vitor de; LANG, Rodrigo Guedes; MARTÍNEZ-HUERTA, Humberto; ARMAND, Johnnier Pérez; CARVALHO JUNIOR, Washington Rodrigues de; SANTOS, Edivaldo Moura; PEIXOTO, Carlos Jose Todero.},title={Features of the energy spectrum of cosmic rays above 2.5 × 10 18 eV using the Pierre Auger Observatory},journal={Physical Review Letters},note={v. 125, n. 12, p. 121106-1-121106-10},year={2020}}