Cosmic rays above the ankle from Z-bursts
Graciela Gelmini, Gabriele Varieschi
Abstract
Neutrinos from far away sources annihilating at the Z resonance on relic neutrinos may give origin to the ultrahigh-energy cosmic rays. Here we present predictions of this mechanism with relic neutrinos lighter than 1 eV, which do not gravitationally cluster. We show that not only the super GZK events, but the "ankle" and all events above it can be accounted for. Most primaries above the ankle are predicted to be nucleons up to 1020.0 eV and photons at higher energies. We also find an accumulation at the GZK cutoff energy, a hint of which can be seen in the data.
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