Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009apj...700l..92m&link_type=abstract
The Astrophysical Journal Letters, Volume 700, Issue 2, pp. L92-L95 (2009).
Astronomy and Astrophysics
Astronomy
11
Astrochemistry, Minor Planets, Asteroids, Nuclear Reactions, Nucleosynthesis, Abundances, Planetary Systems: Protoplanetary Disks, Solar System: Formation
Scientific paper
No 70Zn isotopic anomalies have been detected in primitive meteorites to a level of precision of less than 40 parts per million (2σ). Any pre-existing nucleosynthetic anomaly on 70Zn was averaged out by mixing in the solar nebula before planetary accretion in the solar system. Because neutron-rich nuclides 70Zn and 60Fe are produced by similar nucleosynthetic processes in core-collapse supernovae, the homogeneity of 70Zn in meteorites limits the possible heterogeneity of extinct 60Fe radioactivity in the early solar system. Assuming that Fe and Zn have not been decoupled during incorporation into the solar system, the homogeneity of the 70Zn/64Zn ratio measured here implies that the 60Fe/56Fe ratio was homogenized to less than 15% dispersion before the formation of planetary bodies. The lack (Zn, Ni, Fe) or presence (Ti, Cr) of neutron-rich isotopic anomalies in the iron mass region may be controlled by the volatility of presolar carriers in the nebula.
Dauphas Nicolas
Moynier Frédéric
Podosek Frank A.
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