Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1967
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1967saosr.262.....s&link_type=abstract
SAO Special Report #262 (1967)
Astronomy and Astrophysics
Astrophysics
2
Scientific paper
The annihilations of free electrons and positrons and of positronium are discussed and cross sections are given. Positronium formation under astrophysical conditions is then discussed. A general formula is then derived that gives the gamma-ray spectrum from the annihilation of cosmic-ray positions in terms of the positron source spectrum, energy loss rate, and annihilation cross section gives as functions of energy. The gamma-ray spectrum from the annihilation of thermal positions is calculated, and the gamma-ray intensity from secondary positrons is determined. The secondary positions are considered to arise from the decay of positive mesons that are produced in galactic cosmic-ray p-p and p-α interactions.
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