Abstract
It is now generally believed that 26Al (t1/2=7.2×105 yr) and 107Pd (t1/2=6.5×106 yr) were present in the early Solar System1. Thus, the nucleosynthetic event (supernova?) responsible for the production of these nuclei must have occurred no more than a few million years before the formation of solid bodies2,3. (However, an alternative model based on grain carriers of extinct radioactivities has also been discussed4,5.) It is possible that this event also produced the 129I believed to be present in the early Solar System6–8. However, the last event to contribute 244Pu to the Solar System occurred ∼108 yr before the time of solidification9,10. This latter time scale is also consistent with the lack of evidence for a 247Cm chronometer11,12. We propose here that 182Hf (t1/2=9×106 yr) can resolve the question of whether heavy-element non-actinide nucleosynthesis occurred during the 26Al-producing event. The answer to this question will help to clarify the chronology of the formation of the Solar System and will help to determine the astrophysical sites of heavy-element nucleosynthesis.
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Norman, E., Schramm, D. 182Hf chronometer for the early Solar System. Nature 304, 515–517 (1983). https://doi.org/10.1038/304515a0
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DOI: https://doi.org/10.1038/304515a0
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