Abstract
We re-examine the origin of now-extinct radioactivities, which were alive in the early solar nebula. The Galactic inheritance broadly explains most of the isotopes involved with lifetime \(\tau \gtrsim 5 \) Myr. Instead, shorter-lived isotopes like \(^{26}\)Al, \(^{41}\)Ca and \(^{135}\)Cs require nucleosynthesis events close in time to the solar formation. Models of final stages of Intermediate-Mass Stars (IMSs) now predict the ubiquitous formation of a \(^{13}\)C-pocket, which always implies large excesses in \(^{107}\)Pd with respect to \(^{26}\)Al. Even a late contamination by a Massive Star (MS) meets serious problems, because the inhomogeneous addition of Supernova debris yields excesses on stable isotopes that disagree with measurements.
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Vescovi, D., Busso, M. (2019). The Effects of a Late Single-Star Contamination of the Solar Nebula on the Early Solar System Radioactivities. In: Formicola, A., Junker, M., Gialanella, L., Imbriani, G. (eds) Nuclei in the Cosmos XV. Springer Proceedings in Physics, vol 219. Springer, Cham. https://doi.org/10.1007/978-3-030-13876-9_90
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