Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...316..801k&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 316, May 15, 1987, p. 801-818. NASA-supported research.
Astronomy and Astrophysics
Astrophysics
49
Gamma Rays, Particle Acceleration, Particle Interactions, Particle Production, Positrons, Solar Flares, Calcium, Carbon, Chromium, Iron, Neon, Nickel, Nitrogen, Nuclear Reactions, Oxygen, Radioactive Decay
Scientific paper
Positron production from the decay of radioactive nuclei produced in nuclear interactions of accelerated particles is treated in detail. Laboratory data as well as theoretical considerations are used to construct energy-dependent cross sections for the production of a large number of radioactive positron emitters resulting from proton and alpha-particle interactions with ambient cosmic matter. Using these cross sections, positron production rates are calculated for a variety of energetic particle spectra, assuming solar abundances for both the energetic particles and the ambient medium. These results can be used for the study of astrophysical sites which emit annihilation radiation. In particular, the results have been applied to solar flares, where the observed 0.511 MeV line is shown to be due to positrons resulting from accelerated particle reactions.
Kozlovsky Benz
Lingenfelter Richard E.
Ramaty Reuven
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