  Relic neutrinos with mass 0.07 (+0.02/-0.04) eV, in the range consistent with
Super-Kamiokande data, can explain the cosmic rays with energies in excess of
the Greisen-Zatsepin-Kuzmin cutoff. The spectrum of ultra-high energy cosmic
rays produced in this fashion has some distinctive features that may help
identify their origin. Our mechanism does not require but is consistent with a
neutrino density high enough to be a new kind of hot dark matter.
