Letter | Published:

22Na, Ne–E, extinct radioactive anomalies and unsupported 40Ar

Nature volume 257, pages 3637 (04 September 1975) | Download Citation

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Abstract

A NEW picture1 of the origin of the known extinct radioactivities (129I and 244Pu) holds that these radioactive species were precipitated in grains forming in the rapidly cooling ejecta of explosive nucleosynthesis, and that their decay occurred in interstellar grains rather than in the meteorites. If so, our interpretation of extinct radioactivities is enlarged. Their detectability is no longer related to the usual criterion that they live long enough for the meteorites to form, but rather that they live long enough for grains to form in the expanding envelope.

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Affiliations

  1. Department of Space Physics and Astronomy, Rice University, Houston, Texas 77001

    • DONALD D. CLAYTON

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https://doi.org/10.1038/257036b0

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