The production and survival of Pb-205 in stars, and the (Pb-205)-(Tl-205) s-process chronometry

Details The production and survival of Pb-205 in stars, and the (Pb-205)-(Tl-205) s-process chronometry The production and survival of Pb-205 in stars, and the (Pb-205)-(Tl-205) s-process chronometry

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...145..339y&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 145, no. 2, April 1985, p. 339-346.

Physics

18

Lead Isotopes, Nuclear Fusion, Radioactive Age Determination, Stellar Evolution, Thallium Isotopes, Branching (Physics), Isotope Effect, Meteoritic Composition, Solar System

Scientific paper

The single-irradiation and pulsed-irradiation schematic models of s-process nucleosynthesis developed by Arnould et al. (1984) are used to calculate the s-process (Pb-205)/(Pb-204) production ratio, taking the stellar enhancement of bound-state beta(-) decay of Tl-204 and Tl-205 into account. The results are presented in tables and graphs, and the production ratio is found to be greater than 0.0001 and even to approach unity under some conditions. It is argued that the (Pb-205)-(Tl-205) system can be used as a chronometer of the s-process in the early solar system, contrary to the skepticism of Blake and Schramm (1975). A renewed search for extinct Pb-205 in meteorites is recommended.

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