Radioactive potassium 40 as a cosmic clock

Details Radioactive potassium 40 as a cosmic clock Radioactive potassium 40 as a cosmic clock

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pazh...11..310s&link_type=abstract

(Pis'ma v Astronomicheskii Zhurnal, vol. 11, Mar. 1985, p. 310-318) Soviet Astronomy Letters (ISSN 0360-0327), vol. 11, Mar.-Apr

Astronomy and Astrophysics

Astronomy

Atomic Clocks, Nuclear Fusion, Potassium 40, Radioactive Isotopes, Disk Galaxies, Solar System

Scientific paper

An attempt is made to accurately calculate K-40 production by the s-process, and to ascertain the length of the period over which s-element nucleosynthesis lasted in the Milky Way. The Ne-21, S-36, Cl-37, Ar-40, and K-40 isotope productions of the s-process are calculated so as to fit the abundances of elements heavier than Fe in the solar system. A K-40 age of 6.7 + 0.5, - 0.6 billion years is thereby obtained for single-event nucleosynthesis, or 10.3 + or - 2.0 billion years for continuous, constant rate nucleosynthesis. This is in agreement with the ages of the r-process elements U and Th, as well as with the age of Fe in the Galaxy.

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