Abstract. The Ultra High Energy (UHE) neutrino scattering onto relic cosmic neutrinos in galactic and local halos offers an unique way to overcome GZK cut-off. The UHE ν secondary of UHE photo-pion decays may escape the GZK cut-off and travel on cosmic distances hitting local light relic neutrinos clustered in dark halos. The Z resonant production and the competitive W + W − , ZZ pair production define a characteristic imprint on hadronic consequent UHECR spectra. This imprint keeps memory both of the primary UHE ν spectra as well as of the possible relic neutrino masses values, energy spectra and relic densities. Such an hadronic showering imprint should reflect into spectra morphology of cosmic rays near and above GZK (10 19 − 10 21 eV) cut-off energies. A possible neutrino degenerate masses at eV s or a more complex and significant neutrino mass split below or near Super-Kamiokande △mνSK ∼ 0.1eV masses might be reflected after each corresponding Z peak showering, ( into new) twin un-△mνSK expected UHECR flux modulation behind GZK energies: Ep ∼ 3 ·10 21 eV. Other extreme shadows of lightest, nearly massless, neutrinos mν2K ≃ 0.001eV ≃ kTν, their lowest relic temperatures, energies and densities might be also reflected at eve
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