Stellar origin of the182Hf cosmochronometer and the presolar history of solar system matter

Maria Lugaro, Alexander Heger, Dean Osrin, Stephane Goriely, Kai Zuber, Amanda I. Karakas, Brad K. Gibson, Carolyn L. Doherty, John C. Lattanzio, Ulrich Ott

Research output: Article

38 Citations (Scopus)

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 inferred for 182Hf (half-life = 8.9 million years) and 129I (half-life = 15.7 million years) are in disagreement 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 million years and ∼30 million years, respectively, before the formation of the Sun.

Original languageEnglish
Pages (from-to)650-653
Number of pages4
JournalScience
Volume345
Issue number6197
DOIs
Publication statusPublished - aug. 8 2014

ASJC Scopus subject areas

  • General

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    Lugaro, M., Heger, A., Osrin, D., Goriely, S., Zuber, K., Karakas, A. I., Gibson, B. K., Doherty, C. L., Lattanzio, J. C., & Ott, U. (2014). Stellar origin of the182Hf cosmochronometer and the presolar history of solar system matter. Science, 345(6197), 650-653. https://doi.org/10.1126/science.1253338