Abstract
CLAYTON1 has elaborated on his unorthodox interpretation2 of the occurrence in meteorites of the decay products of the extinct radionuclides 129I and 244Pu. He has suggested that these radioactive species did not decay in the meteorites but rather in interstellar grains which, on the formation of the meteorites, were incorporated without much alteration. Thus, the concentration in the meteorites of the decay products does not reflect the time of meteorite formation relative to the cessation of nucleosynthesis but is essentially governed by the fraction of interstellar grains mixed with the meteoritic matter proper. If that is true, anomalies will occur in the isotopic composition of numerous elements. The decisive criterion of whether an over-abundance of a given isotope can be expected is the production yield during nucleosynthesis of a radioactive precursor; the half life of that precursor is of only minor importance.
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References
Clayton, D. D., Nature, 257, 36 (1975).
Clayton, D. D., Astrophys. J., 199, 765 (1975).
Woosley, S. E., Arnett, W. D., and Clayton, D. D., Astrophys. J. Supp. Ser., 26, 231 (1973).
Blander, M., and Fuchs, L. H., Geochim. cosmochim. Acta, (in the press).
Clayton, R. N., Grossman, L., and Mayeda, T. K., Science, 182, 485 (1973).
Gray, C. M., and Compston, W., Nature, 251, 495 (1974).
Papanastassiou, D. A., and Lee, T., J. geophys. Res. Lett., 1, 225 (1974).
Wanke, H., Baddenhausen, H., Palme, H., and Spettel, B., Earth planet. Sci. Lett., 23, 1 (1974).
Stegmann, W., and Begemann, F., Z. Naturf., 30 a, 968 (1975).
Nier, A. O., Phys. Rev., 77, 789 (1950).
Burnett, D. S., Lippolt, H. J., and Wasserburg, G. J., J. geophys. Res., 71, 1249 (1966).
Peters, J. G., Fowler, W. A., and Clayton, D. D., Astrophys. J., 173, 637 (1972).
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BEGEMANN, F., STEGMANN, W. Implications from the absence of a 41K anomaly in an Allende inclusion. Nature 259, 549–550 (1976). https://doi.org/10.1038/259549a0
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DOI: https://doi.org/10.1038/259549a0
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