EXPECTED COSMIC-RAY FLUXES FROM THE ANNIHILATION OF HEAVY STABLE NEUTRINOS IN THE GALACTIC HALO

The fluxes of cosmic-ray antiprotons, positrons, electrons,and photons to be expected from the annihilation of relic heavy neutrinos in the galactic halo are analyzed in detail. The spectra of particles are eva luated by means of a Monte Carlo simulation. The results of the calcul ations show that investigation of the spectra of cosmic-ray positrons at high energies could provide a distinct signal from annihilation of very heavy neutrinos in the Galaxy and furnish important information a bout the parameters of dark-matter particles.