Stellar origin of the Hf-182 cosmochronometer and the presolar history of solar system matter

Lugaro, Maria and Heger, Alexander and Osrin, Dean and Goriely, Stephane and Zuber, Kai and Karakas, Amanda I and Gibson, Brad K and Doherty, Carolyn L and Lattanzio, John C and Ott, Ulrich (2014) Stellar origin of the Hf-182 cosmochronometer and the presolar history of solar system matter. SCIENCE, 345 (6197). pp. 650-653. ISSN 0036-8075

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Abstract

Among the short-lived radioactive nuclei inferred to be present in the early solar system via meteoritic analyses there are several heavier than iron whose stellar origin has been poorly understood. In particular, the abundances in- ferred for 182Hf (half-life = 8.9 Myr) and 129I (half-life = 15.7 Myr) are in dis- agreement with each other if both nuclei are produced by the rapid neutron- capture process. Here we demonstrate that, contrary to previous assumption, the slow neutron-capture process in asymptotic giant branch stars produces 182Hf. This has allowed us to date the last rapid and slow neutron-capture events that contaminated the solar system material at ∼100 Myr and ∼30 Myr, respectively, before the formation of the Sun.

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