Observation of the suppression of the flux of cosmic rays above 4×1019eV
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 pbkp_rediction by Greisen and by Zatsepin and Kuz'min. © 2008 The American Physical Society.
Año de publicación:
2008
Keywords:
Fuente:

Tipo de documento:
Article
Estado:
Acceso restringido
Áreas de conocimiento:
- Rayo cósmico
Áreas temáticas:
- Física moderna
- Geología, hidrología, meteorología
- Cuerpos y fenómenos celestes específicos
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