No cosmic antinucleus has yet been detected in the primary cosmic radiation. Only upper limits to the antinucleus fluxes have been measured in various rigidity ranges in different experiments. Calculations of the flux reduction experienced by cosmic antihelium traversing the Milky Way are reported. A significant depression of the antihelium flux has been found in the low-momentum band 2-6 GeV/c compared to that postulated to exist in the intergalactic space. The relevant results presented here are based on simple observational data regarding the total matter column swept by cosmic rays in the Milky Way and the expected properties of antihelium interactions with the interstellar hydrogen. The calculations have been made by the simulation code LEASA (Low Energy Antinucleus Simulation Algorithms) developed to describe antinucleus interactions with matter. Important implications of these results on past and future experiments giving upper limits on antihelium-to-helium flux ratios are discussed.
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A. Codino (1997) studied this question.
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