High-voltage microscope observations of micron-sized grains extracted from a fraction of the Orgueil meteorite rich in Ne-22 give strong experimental evidence for their heavy irradiation. It is suggested that the excess of Ne-22 measured in the same mineral separate can be explained by low-energy (less than 10 MeV) production by (p, alpha) reaction on Mg-25. A discussion of the astrophysical sites potentially responsible for the peculiar irradiation history of the meteoritic grains is presented.
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Audouze et al. (1976) studied this question.