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.

Features of the Energy Spectrum of Cosmic Rays above 2.5×1018  eV Using the Pierre Auger Observatory / Aab, A., Abreu, P., Aglietta, M., Albury, J. M., Allekotte, I., Almela, A., Alvarez Castillo, J., Alvarez-Muñiz, J., Alves Batista, R., Anastasi, G. A., Anchordoqui, L., Andrada, B., Andringa, S., Aramo, C., Araújo Ferreira, P. R., Asorey, H., Assis, P., Avila, G., Badescu, A. M., Bakalova, A., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 125:12(2020). [10.1103/PhysRevLett.125.121106]

Features of the Energy Spectrum of Cosmic Rays above 2.5×1018  eV Using the Pierre Auger Observatory

Mastrodicasa, M.;
2020

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
cosmic ray; astroparticle detectors; cosmic ray spectra
01 Pubblicazione su rivista::01a Articolo in rivista
Features of the Energy Spectrum of Cosmic Rays above 2.5×1018  eV Using the Pierre Auger Observatory / Aab, A., Abreu, P., Aglietta, M., Albury, J. M., Allekotte, I., Almela, A., Alvarez Castillo, J., Alvarez-Muñiz, J., Alves Batista, R., Anastasi, G. A., Anchordoqui, L., Andrada, B., Andringa, S., Aramo, C., Araújo Ferreira, P. R., Asorey, H., Assis, P., Avila, G., Badescu, A. M., Bakalova, A., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 125:12(2020). [10.1103/PhysRevLett.125.121106]
File allegati a questo prodotto
File Dimensione Formato  
Aab_Features of the Energy Spectrum_2020.pdf

accesso aperto

Tipologia: Versione editoriale (versione pubblicata con il layout dell'editore)
Licenza: Creative commons
Dimensione 306.56 kB
Formato Adobe PDF
306.56 kB Adobe PDF

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1644664
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 174
  • ???jsp.display-item.citation.isi??? 128
social impact