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Type: Journal article
Title: Observation of the suppression of the flux of cosmic rays above 4×10¹⁹ eV
Other Titles: Observation of the suppression of the flux of cosmic rays above 4x10(19) eV
Author: Abraham, J.
Abreu, P.
Aglietta, M.
Aguirre, I.
Allard, D.
Allekotte, I.
Allen, J.
Allison, P.
Alvarez-Muniz, J.
Ambrosio, M.
Anchordoqui, L.
Andringa, S.
Anzalone, A.
Aramo, C.
Argiro, S.
Arisaka, K.
Armengaud, E.
Arneodo, F.
Arqueros, F.
Asch, T.
et al.
Citation: Physical Review Letters, 2008; 101(6):061101-1-061101-7
Publisher: American Physical Soc
Issue Date: 2008
ISSN: 0031-9007
Statement of
J. Abraham...R. W. Clay...B. R. Dawson... et al. (The Pierre Auger Collaboration)
Abstract: The energy spectrum of cosmic rays above 2.5×1018eV, derived from 20000 events recorded at the Pierre Auger Observatory, is described. The spectral index γ of the particle flux, JE-γ, at energies between 4×1018eV and 4×1019eV 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.
Keywords: Pierre Auger Collaboration
Rights: ©2008 American Physical Society
DOI: 10.1103/PhysRevLett.101.061101
Grant ID: ARC
Appears in Collections:Aurora harvest
Physics publications

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