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Search for Antiprotons in Cosmic Rays

A search for low-energy pmacr- annihilation stars in nuclear emulsions exposed to the cosmic radiation in 1963 has been carried out. No antiprotons were detected and an upper limit of 3 · 10-3 m-2 s-1 sr-1 (MeV)-1 is obtained for the flux in the energy range (120 ÷ 220) MeV. It was found that interactions of α-particles can mimic some features of p̄ annihilation as seen in this type of experiment.