THE ELUSIVE {sup 60}Fe IN THE SOLAR NEBULA

No {sup 60}Ni or {sup 61}Ni anomalies have been detected in troilite inclusions from Muonionalusta, a 4565.3 {+-} 0.1 Ma old IVA iron meteorite, to the level of the analytical precision of 10 ppm. Because Muonionalusta troilite is very old, has a high Fe/Ni ratio, and is free of {sup 61}Ni anomalies...

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Bibliographic Details
Published in:The Astrophysical journal 2011-11, Vol.741 (2)
Main Authors: Moynier, Frederic, Wang, Kun, Blichert-Toft, Janne, Albarede, Francis, Herzog, Gregory F.
Format: Article
Language:English
Subjects:
ABUNDANCE
ASTEROIDS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
DECAY
EVEN-EVEN NUCLEI
INTERMEDIATE MASS NUCLEI
IRON ISOTOPES
ISOTOPES
MINERALS
NEBULAE
NICKEL 60
NICKEL ISOTOPES
NUCLEAR DECAY
NUCLEAR REACTIONS
NUCLEI
NUCLEOSYNTHESIS
PLANETS
PROTOPLANETS
PYRRHOTITE
SOLAR NEBULA
SOLAR SYSTEM
STABLE ISOTOPES
SULFIDE MINERALS
SYNTHESIS
TROILITE
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Summary:No {sup 60}Ni or {sup 61}Ni anomalies have been detected in troilite inclusions from Muonionalusta, a 4565.3 {+-} 0.1 Ma old IVA iron meteorite, to the level of the analytical precision of 10 ppm. Because Muonionalusta troilite is very old, has a high Fe/Ni ratio, and is free of {sup 61}Ni anomalies, it is the ideal material in which to search for potential excesses of {sup 60}Ni produced by the decay of {sup 60}Fe (t{sub 1/2} = 2.62 Ma). The {sup 60}Ni/{sup 58}Ni and Fe/Ni ratios (up to 1680) measured here imply an upper limit for the initial {sup 60}Fe/{sup 56}Fe for the Muonionalusta troilite of 3 Multiplication-Sign 10{sup -9}. Assuming that {sup 60}Fe was homogeneously distributed across the nebula, this result suggests that the solar system initial {sup 60}Fe/{sup 56}Fe ratio was less than 5 Multiplication-Sign 10{sup -9}, which is lower than previously measured by at least a factor of 50.
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/741/2/71;COUNTRYOFINPUT:INTERNATIONALATOMICENERGYAGENCY(IAEA)