Physics
Scientific paper
Apr 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984josab...1..307w&link_type=abstract
(NASA, NRC, and University of California, Symposium on Atomic Spectroscopy, Berkeley, CA, Sept. 12-16, 1983) Optical Society of
Physics
7
Abundance, Heavy Elements, Metallic Stars, Stellar Spectra, Neutrons, Niobium, Nuclear Capture, Radioactive Decay, Stellar Interiors, Technetium Isotopes
Scientific paper
A brief history is given of astronomical observations of the spectra of heavy elements in stars, with emphasis on those elements produced by slow capture of neutrons in the stellar interior. As an example, an abundance analysis of the electrons zirconium through ruthenium, including the unstable element technetium, is described. Schemes for explaining the presence of technetium (probably Tc-99 with a half-life of 200,000 years) and the presence of niobium (formed by decay of Zr-93 with a half-life of 1,500,000 years) are discussed. The importance of radioactive decay of technetium from an excited nuclear state is stressed.
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