A local proton irradiation model for isotopic anomalies in the solar system

Astronomy and Astrophysics – Astrophysics

Scientific paper

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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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