Slow neutron capture origin for isomeric Ta-180

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Neutrons, Nuclear Capture, Sun, Tantalum Isotopes, Abundance, Electron Capture, Heavy Nuclei, Isomers

Scientific paper

Analytical evidence is presented to show that isomeric state Ta-180 can be formed by the solar s-process. Isometric Ta-180 is treated as an isotope formed separately from short-lived ground state materials. Consideration is given to a 10 billion-1 trillion/cu cm neutron number density, 200-400 million K temperatures, and mass densities of 1000-10,000 g/cu cm. The beta transition rates of Hf-179 and Ta-179 in s-process conditions are analyzed in terms of beta transitions in a plasma of electrons and ions. Large fractional populations of isomeric state Ta-180 are obtained from de-excitation of levels with high-K quantum numbers,indicating that the s-process can produce a large part of the Ta-180 abundance in the sun. Astrophysical observatins which could confirm the calculations are suggested.

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