Physics
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993phr...227..283c&link_type=abstract
Physics Reports, Volume 227, Issue 1-5, p. 283-291.
Physics
17
Scientific paper
There is now evidence, ranging in quality from very strong to marginal, for the existence in early solar system material of ten radionuclides with mean lives long enough for them to be incorporated live in our planetary system but not long enough to be live at the present time. Of these ten, one (244Pu) is unquestionably an r-process product, and for ( 135Cs, 107Pd, 129I, and 182Hf) might in principle have been made by either the r-process or the s-process. One of us has constructed a model for the history of the local part of the galaxy into which the abundances of the ten extinct nuclides can be fitted. The purpose of the present paper is to explain in greater detail the reasoning that has led to the assignment of 129I to the r-process and the assignment of the others to the s-process. These latter assignments do not correspond to the traditional assignments of these nuclides as primarily r-process products. It is shown that most of the so-called r-process isobars in the solar system abundance table can have s-process contributions in lower mass AGB stars where peak neutron number densities of 3 × 109 to 3 × 1010 cm-3 are expected during helium shell flashes.
Cameron G. W. A.
Cowan John J.
Thielemann Friederich-Karl
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