Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...224..217l&link_type=abstract
Astrophysical Journal, Part 1, vol. 224, Aug. 15, 1978, p. 217-226.
Astronomy and Astrophysics
Astrophysics
44
Abundance, Aluminum 26, Nuclear Fusion, Oxygen, Proton Irradiation, Solar System, Astrophysics, Barium Isotopes, Calcium Isotopes, Carbonaceous Chondrites, Energy Distribution, Fluence, Magnesium Isotopes, Proton Energy
Scientific paper
An attempt is made to explain the O-16 and Al-26 anomalies observed in solar-system bodies in the framework of a local irradiation model wherein a small amount of solar system matter of normal isotopic composition was irradiated by energetic protons from the primeval sun. Several isotopic constraints are summarized with which the model should be consistent, and a proton energy distribution and fluence and a target elemental composition are chosen such that the extraordinary component produced by irradiation satisfies the constraints. Detailed attention is given to the relevant oxygen reactions, Al-26 production, and effects of proton irradiation on isotopes of Mg, Ca, and Ba. A scenario is outlined which satisfies all the constraints. Consequences of the model are discussed with respect to the isotopic anomalies observed in Allende inclusions.
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