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S-process nucleosynthesis in primordial AGB stars

par Siess, Lionel ;Goriely, Stéphane
Référence Nuclear Physics A, 718, page (524-526)
Publication Publié, 2003

Article révisé par les pairs

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Résumé :

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) l6O 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.