Nuclear chronometers from the r-process and the age of the galaxy

Details Nuclear chronometers from the r-process and the age of the galaxy Nuclear chronometers from the r-process and the age of the galaxy

Dec 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...323..543c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 323, Dec. 15, 1987, p. 543-552.

Mathematics

Logic

37

Abundance, Astronomical Models, Chronometers, Galactic Evolution, Nuclear Fusion, Chemical Evolution, Cosmology, Radioactive Decay

Scientific paper

The cosmochronologically important nuclear production ratios 232Th/238U, 235U/238U, and 244Pu/238U are calculated in the context of a specific model for r-process nucleosynthesis which predicts an overall abundance pattern in good agreement with the distribution of abundances of the r-process nuclei in solar system matter. The calculated production ratios, when interpreted within a simple exponential model of Galactic evolution allowing values of initial disk enrichment ranging from approximately 10% to 30%, lead to Galactic ages ranging from 12.4 to 14.7×109yr. More complex Galactic evolution models with infall and without instantaneous initial metal enrichment could increase the age of the Galaxy by as much as approximately 2 - 3×109yr.

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