Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976ap%26ss..39..103w&link_type=abstract
Astrophysics and Space Science, vol. 39, Jan. 1976, p. 103-121.
Astronomy and Astrophysics
Astrophysics
12
Abundance, Iron Isotopes, Nuclear Fusion, Primary Cosmic Rays, Mass Ratios, Neutrons, Particle Acceleration, Supernovae
Scientific paper
Measurement of the isotopic composition of iron in primary cosmic rays will yield valuable information about the site (or sites) of its production. A solar-like composition could have several explanations, but even a very crude concurrent measurement of the isotopes of nickel could clarify the situation. Enhancements of Fe-54 or Fe-58 relative to Fe-56 would be indicative of acceleration of material from regions typically more neutron-rich than those responsible for solar abundances. Slight enhancements of Fe-54 could be explained by taking as cosmic-ray sources supernovae of different typical masses or higher initial metallicities than those responsible for solar nucleosynthesis. Dominance of Fe-54 or Fe-58 would be indicative of very neutron-rich matter such as can only occur in the deep interior of a highly evolved star. Such dominance would also be strong evidence for the acceleration of relatively unmixed material from deep inside a supernova.
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