On an Irradiation Origin for Magnesium Isotope Anomalies in Meteoritic Hibonite

Details On an Irradiation Origin for Magnesium Isotope Anomalies in Meteoritic Hibonite On an Irradiation Origin for Magnesium Isotope Anomalies in Meteoritic Hibonite

Jun 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009apj...697l.145l&link_type=abstract

The Astrophysical Journal Letters, Volume 697, Issue 2, pp. L145-L148 (2009).

Astronomy and Astrophysics

Astronomy

2

Cosmic Rays, Meteors, Meteoroids, Nuclear Reactions, Nucleosynthesis, Abundances

Scientific paper

We investigate spallogenic effects on magnesium isotopic compositions in solids with hibonite-like (CaAl12O19) chemistry under an irradiation setting in the early solar system. We consider a series of nuclear reactions triggered by gradual flare irradiation, with an energy spectrum dN/dE vprop E -2.7 and a proton flux Fp (E>= 10 MeV) = 1.9 × 1010 cm-2 s-1, on isotopically normal hibonite-like solids. The proton fluence is constrained by matching the 10Be/9Be measured in meteoritic hibonite platy crystals. The net result, accounting for both production and destruction reactions of Mg isotopes, shows small deviations from the terrestrial isotopic composition with the sign and magnitude of Δ26Mg effects dependent on both low energy cutoff and total fluence. The total span of predicted spallogenic deviations can explain small apparent 26Mg excesses observed in some hibonite grains, but does not account for the magnitude of apparent 26Mg deficits found in other grains. As previously indicated, irradiation by gradual flares decouples Δ26Mg variations and 26Al/27Al from 10Be/9Be.

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