Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980icrc....2..231k&link_type=abstract
In: International Cosmic Ray Conference, 16th, Kyoto, Japan, August 6-18, 1979, Conference Papers. Volume 2. (A81-12386 02-93) T
Astronomy and Astrophysics
Astronomy
Abundance, Astronomical Models, Cosmic Rays, Magnesium Isotopes, Oxygen Isotopes, Solar System, Anomalies, Barium Isotopes, Calcium Isotopes, Capture Effect, Evolution (Development), Fractionation, Particle Interactions, Radiant Flux Density, Spallation, Supernovae
Scientific paper
A mixture of freshly synthesized elements and old debris formed in earlier events located in a region not far from the site of a supernova explosion must have received a total time-integrated cosmic-ray flux such that the isotopic compositions of many of the elements were altered appreciably by the proton- and neutron-induced reactions. Such an 'early' irradiation model of the solar system material is used to explain the recently observed isotopic anomalies in meteorites. The anomalies observed in O, Mg and Ca can be attributed to a combined effect of mass-fractionation and spallation processes. The Ba and Xe anomalies can be attributed to a combined effect of mass-fractionation, neutron-capture and spallation processes.
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