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Present experimental data do not exclude fast oscillation of the neutron $n$to its degenerate twin from a hypothetical parallel sector, the so calledmirror neutron $n'$. We show that this effect brings to a remarkablemodifications of the ultrahigh-energy cosmic ray spectrum testable by thepresent Pierre Auger Observatory (PAO) and Telescope Array (TA) detector, andthe future JEM-EUSO experiment. In particular, the baryon non-conservationduring UHECR propagation at large cosmological distances shifts the beginningof the GZK cutoff to lower energies, while in presence of mirror sources it mayenhance the spectrum at $E \gtrsim 100$ EeV. As a consequence, a significantreduction of the expected diffuse cosmogenic neutrino flux is predicted.

Neutron Oscillations to Parallel World: Earlier End to the Cosmic Ray Spectrum?