S-process nucleosynthesis in primordial AGB stars

Details S-process nucleosynthesis in primordial AGB stars S-process nucleosynthesis in primordial AGB stars

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003nupha.718..524s&link_type=abstract

Nuclear Physics A, Volume 718, p. 524-526.

Physics

Nuclear Physics

2

Scientific paper

Despite the lack of iron seeds and provided partial mixing of protons takes place below the convective envelope, it is shown that the production of s-process elements can be efficient in primordial AGB stars. The synthesis proceeds as follows: neutrons are mainly produced by the 13C(α,n)16O reaction and captured by the abundant C-Ne isotopes to synthesized heavier species which will then serve as efficient seed elements for the s-process thanks to their larger neutron cross sections. When the bottleneck formed by the 33S(n,α)30Si is passed, the synthesis of s-elements proceeds in a standard way. Under the assumption that protons can diffuse below the envelope, primordial AGB stars are expected to be s-process enriched and to exhibit strong signatures of Pb and Bi.
S.G. is FNRS research associate.

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