INVESTIGADORES
OTERO Lidia Ana
artículos
Título:
Observation of the suppression of the flux of cosmic rays above 4 x 1019 eV
Autor/es:
THE PIERRE AUGER COLLABORATION, ET AL., L. OTERO
Revista:
PHYSICAL REVIEW LETTERS
Editorial:
AMER PHYSICAL SOC
Referencias:
Año: 2008 vol. 101 p. 1 - 7
ISSN:
0031-9007
Resumen:
The energy spectrum of cosmic rays above 2:5 x 1018 eV, derived from 20 000 events recorded at the Pierre Auger Observatory, is described. The spectral index _ of the particle flux, J µ Eg, at energies between 4 x 1018 eV and 4 x 1019 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 Kuzmin.
