Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977esasp.124..225m&link_type=abstract
In ESA Recent Advan. in Gamma-Ray Astronomy p 225-234 (SEE N78-11899 02-88)
Astronomy and Astrophysics
Astronomy
Cosmic Rays, Cosmology, Gamma Rays, Light Elements, Abundance, Background Radiation, Collisions
Scientific paper
The view that was examined which was the 1 to 100 MeV gamma-ray background is of cosmological origin and is produced by high-energy collisions in a burst at high redshifts (about 100) between cosmic rays and the ambient gas, as suggested by Stecker (1969). To test this cosmological cosmic ray (CCR) hypothesis, use was made of the fact that, simultaneously, low energy interactions give birth to the light elements D, He-3, Li-6, Li-7 and Be-7. Their resulting abundances are calculated by normalizing the CCR flux to the observed gamma-ray background. Since it is possible to find the correct (observed) Li-7 abundance, which is otherwise unexplained as yet, by this process, it is of interest to discuss the various uncertainities involved in the calculations. Among these, the spread of the present gamma-ray data, especially between 1 and about 10 MeV, is a major uncertainty, and emphasis is put on its influence on the results and, as a consequence, on the validity of the CCR hypothesis.
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