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Radioactivities from Stellar Nucleosynthesis: Slow and Fast Clocks in the Solar System
Published online by Cambridge University Press: 27 September 2007
Abstract
I briefly review the relevance of radioactive nuclei for timing
events of interest in the evolution of the Solar System. The related
techniques are based on nuclear radio-chronometry of terrestrial or
meteoritic samples. A special attention is paid to short lived
($\bar \tau \le$ 100 Myr) isotopes produced by stellar
nucleosynthesis: I mention the indirect information we have on their
presence in the early solar nebula, and discuss their use both for
establishing very precise isochrons in the initial evolutionary
stages of the Solar System, and for inferring the history of
nucleosynthesis prior to the Sun's formation. In particular, from
the existing record of a few important nuclei (26Al, 60Fe,
205Pb, 41Ca among others) it appears that the protosolar
nebula was subject to late contaminations both by spallation
reactions in the fast winds of the early Sun, and by a nearby star.
The recent suggestions that this last was of low or intermediate
mass are also discussed.
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- Research Article
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- Copyright
- © EAS, EDP Sciences, 2007