Abstract
Hoyle obtained a steady-state model for an expanding universe by introducing continuous creation of matter into the field equations of general relativity. Morrison has speculated that the creation of matter throughout the universe may take place by formation of particle--antiparticle pairs which subsequently are segregated by a repulsive force between matter and anti-matter. Burbidge and Hall have estimated that the ratio of antimatter to matter in our galaxy can not exceed -- 10/sup -7/ This investigation points out that a slightly more stringent limit for this ratio is sugge sted by cosmic ray measurements. More precise information concerning the density of antiparticles in the galaxy can be obtained by carrying a simple scintillation gamma spectrometer some distance from the earth in a satelite or space probe. (A.C.)
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