On the production of technetium in thermally pulsing red giant stars

Details On the production of technetium in thermally pulsing red giant stars On the production of technetium in thermally pulsing red giant stars

Aug 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...283..313c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 283, Aug. 1, 1984, p. 313-315.

Astronomy and Astrophysics

Astrophysics

5

Nuclear Fusion, Red Giant Stars, Stellar Cores, Technetium, Chemical Evolution, Radiative Lifetime, Radioactive Decay, Stellar Temperature

Scientific paper

The concentration of Tc-99 which may be expected to characterize the s-process matter in intermediate-mass red-giant stars at the termination of a thermal pulse is shown to be an extremely sensitive function of the temperature and time scale conditions. The Tc-99 beta-decay rate is found to be approximately 100,000 times its terrestrial value, at the prevailing temperatures. Critical nuclear uncertainties are noted, as are strong dependences on the properties of the stellar environment. It is concluded that the effective use of the Tc-99 concentration as a probe of the stellar environment will require both improved nuclear data and a very detailed integration over the thermal pulsing stage of evolution of intermediate-mass red-giant stars.

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