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Context. The composition of Galactic cosmic rays (GCR) presents strong similarities to the standard (cosmic) composition, but also noticeable differences, the most important of which is the high isotopic ratio of 22Ne/20Ne, which is ~5 times higher in GCR than in the Sun. This ratio provides key information on the GCR origin.
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Nikos Prantzos (2012) studied this question.
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