Other
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1016..430n&link_type=abstract
ORIGIN OF MATTER AND EVOLUTION OF GALAXIES: The 10th International Symposium on Origin of Matter and Evolution of Galaxies: From
Other
Fission Reactors, Supernova Remnants, Stellar Clusters And Associations, Neutrino, Muon, Pion, And Other Elementary Particles, Cosmic Rays
Scientific paper
Recent observations of halo stars indicate non-primordial 6Li and Be, which are produced through cosmic-ray interactions. Some energetic supernovae can accelerate particles to energies enough to interact with ambient material and produce light elements including 6Li and 9Be. We investigate interactions between Type Ib/c supernova ejecta and the circumstellar matter (CSM) as production sites for the light elements, particularly 6Li and 9Be in the early stages of the Galactic chemical evolution. Considered are energetic Type Ib/c supernova explosions of Wolf-Rayet type stars at low metallicities, embedded in the dense CSM. The energetic portion of the supernova ejecta can interact directly with the circumstellar material and induce light-element production via spallation and α-α fusion reactions. We find that accelerated particles lose their energy through Coulomb collisions with free electrons near the stellar surface where very dense CSM resides, so that most of light elements are produced at the near-surface region. This fact suggests that the amounts of produced light elements and their ratios strongly depend on the chemical compositions of the region. The resulting 6Li and 9Be abundances in the ejecta and the cicumstellar material out of which very metal-poor stars form may show scattering, though it has not yet been confirmed.
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