Diffuse gamma-ray line emission and cosmic rays

Details Diffuse gamma-ray line emission and cosmic rays Diffuse gamma-ray line emission and cosmic rays

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....6.2366d&link_type=abstract

Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int

Physics

Scientific paper

Gamma-ray lines arise from radioactivities produced in nucleosynthesis sites, and from deexcitation of nuclei which have been activated through energetic particle collisions. Nucleosynthesis products relate to activities inside massive stars. Supernova remnants show radioactivity afterglows at time scales which bracket their likely phases of relevance as cosmic-ray acceleration sites; 26 Al radioactivity may trace regions of intense wind interactions from groups of massive stars, and also encode information about the possible injection of matter into CR acceleration environments through interstellar dust grains. Nuclear excitation occurs mainly from low-energy cosmic rays which do not travel far from their acceleration sites. Hence both these gamma-ray line emission processes are related to the likely sources of cosmic rays.

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