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Observation of the suppression of the flux of cosmic rays above 4 x 10 (19) eV |
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| Authors: | Abraham J Abreu P Aglietta M Aguirre C Allard D Allekotte I Allen J Allison P Alvarez-Muñiz J Ambrosio M Anchordoqui L Andringa S Anzalone A Aramo C Argirò S Arisaka K Armengaud E Arneodo F Arqueros F Asch T Asorey H Assis P Atulugama B S Aublin J Ave M Avila G Bäcker T Badagnani D Barbosa A F Barnhill D Barroso S L C Baughman B Bauleo P Beatty J J Beau T Becker B R Becker K H Bellido J A Benzvi S Berat C Bergmann T Bernardini P Bertou X Biermann P L Billoir P Blanch-Bigas O Blanco F Blasi P Bleve C Blümer H Bohácová M Bonifazi C Bonino R Brack J Brogueira P Brown W C Buchholz P Bueno A |
| Institution: | Universidad Tecnológica Nacional, FR-Mendoza, Argentina. |
| Abstract: | The energy spectrum of cosmic rays above 2.5 x 10;{18} eV, derived from 20,000 events recorded at the Pierre Auger Observatory, is described. The spectral index gamma of the particle flux, J proportional, variantE;{-gamma}, at energies between 4 x 10;{18} eV and 4 x 10;{19} eV is 2.69+/-0.02(stat)+/-0.06(syst), steepening to 4.2+/-0.4(stat)+/-0.06(syst) at higher energies. The hypothesis of a single power law is rejected with a significance greater than 6 standard deviations. The data are consistent with the prediction by Greisen and by Zatsepin and Kuz'min. |
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