A SEARCH FOR {sup 70}Zn ANOMALIES IN METEORITES
- Earth and Planetary Sciences and McDonnell Center for the Space Sciences, Washington University in St. Louis, One Brookings Drive, St. Louis, MO 63130 (United States)
- Origins Laboratory, Department of Geophysical Sciences and Enrico Fermi Institute, University of Chicago, Chicago, IL 60637 (United States)
No {sup 70}Zn isotopic anomalies have been detected in primitive meteorites to a level of precision of less than 40 parts per million (2{sigma}). Any pre-existing nucleosynthetic anomaly on {sup 70}Zn was averaged out by mixing in the solar nebula before planetary accretion in the solar system. Because neutron-rich nuclides {sup 70}Zn and {sup 60}Fe are produced by similar nucleosynthetic processes in core-collapse supernovae, the homogeneity of {sup 70}Zn in meteorites limits the possible heterogeneity of extinct {sup 60}Fe 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 {sup 70}Zn/{sup 64}Zn ratio measured here implies that the {sup 60}Fe/{sup 56}Fe 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.
- OSTI ID:
- 21313812
- Journal Information:
- Astrophysical Journal (Online), Vol. 700, Issue 2; Other Information: DOI: 10.1088/0004-637X/700/2/L92; Country of input: International Atomic Energy Agency (IAEA); ISSN 1538-4357
- Country of Publication:
- United States
- Language:
- English
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