Slow neutron capture origin for isomeric Ta-180

Details Slow neutron capture origin for isomeric Ta-180 Slow neutron capture origin for isomeric Ta-180

Sep 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983natur.305..198y&link_type=abstract

Nature (ISSN 0028-0836), vol. 305, Sept. 15, 1983, p. 198-201. Research supported by the Deutsche Forschungsgemeinschaft and Ges

Astronomy and Astrophysics

Astrophysics

40

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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