Observation of the suppression of the flux of cosmic rays above 4脳1019eV
Physical Review Letters 101:6 (2008)
Authors:
J Abraham, P Abreu, M Aglietta, C Aguirre, D Allard, I Allekotte, J Allen, P Allison, J Alvarez-Mu帽iz, M Ambrosio, L Anchordoqui, S Andringa, A Anzalone, C Aramo, S Argir貌, K Arisaka, E Armengaud, F Arneodo, F Arqueros, T Asch, H Asorey, P Assis, BS Atulugama, J Aublin, M Ave, G Avila, T B盲cker, D Badagnani, AF Barbosa, D Barnhill, SLC Barroso, B Baughman, P Bauleo, JJ Beatty, T Beau, BR Becker, KH Becker, JA Bellido, S Benzvi, C Berat, T Bergmann, P Bernardini, X Bertou, PL Biermann, P Billoir, O Blanch-Bigas, F Blanco, P Blasi, C Bleve, H Bl眉mer, M Boh谩膷ov谩, C Bonifazi, R Bonino, J Brack, P Brogueira, WC Brown, P Buchholz, A Bueno, RE Burton, NG Busca, KS Caballero-Mora, B Cai, DV Camin, L Caramete, R Caruso, W Carvalho, A Castellina, O Catalano, G Cataldi, L Cazon, R Cester, J Chauvin, A Chiavassa, JA Chinellato, A Chou, J Chudoba, J Chye, PDJ Clark, RW Clay, E Colombo, R Concei莽茫o, B Connolly, F Contreras, J Coppens, A Cordier, U Cotti, S Coutu, CE Covault, A Creusot, A Criss, J Cronin, A Curutiu, S Dagoret-Campagne, K Daumiller, BR Dawson, RM De Almeida, C De Donato, SJ De Jong, G De La Vega, WJMDM Junior
Abstract:
The energy spectrum of cosmic rays above 2.5脳1018eV, derived from 20000 events recorded at the Pierre Auger Observatory, is described. The spectral index 纬 of the particle flux, JE-纬, at energies between 4脳1018eV and 4脳1019eV is 2.69卤0.02(stat)卤0.06(syst), steepening to 4.2卤0.4(stat)卤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. 漏 2008 The American Physical Society.
