The Production of Cosmic Gamma Rays in Interstellar and Intergalactic Cosmic-Ray Collisions. Iv: Gamma-Ray Production from Cosmic Proton-Antiproton Interactions

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Scientific paper

Various cosmological situations are discussed in which the annihilation of anti-matter will produce cosmic gamma-rays. An upper limit is placed on the amount of cosmic matter-antimatter interaction consistent with recent cosmic gamma-ray observation It is shown that the production of mesons other than pions have little effect on the annihilation gamma-rays spectrum. It is also shown that gamma rays arising from annihilations at rest have energies between 5 and 865 MeV. The gamma-rays spectrum from annihilations at rest is calculated and compared with the calculations of Frye and Smith. A discussion is then presented of the various characteristics of proton-antiproton interactions in flight. Production of various mesons, hyperons, and isob isobars is discussed and cross sections are given. General implications of the data on the resultant gamma-ray spectra are stated.

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