Note on technetium in stars

Details Note on technetium in stars Note on technetium in stars

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...122..327s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 122, no. 1-2, June 1983, p. 327-329.

Astronomy and Astrophysics

Astrophysics

20

Abundance, Cosmochemistry, Neutron Emission, Nuclear Fusion, Technetium, Absorption Cross Sections, Half Life, Temperature Dependence

Scientific paper

The steady state abundance of Tc during the s-process is calculated, and a ratio of Ns(Tc)/Ns(Ba) = 0.0162 ± 0.025 is obtained. It is pointed out that this figure sets an upper limit to the observed Tc abundance in stars. An observational number approaching this figure would imply that most of the s-process material observed in these stars is not primordial and that this material is cooled down rapidly to temperatures T8 < 1 after synthesis. The latter is a consequence of a strong temperature dependence of the 99Tc half-life which is calculated for T8 < 5.

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