The Role of Primary 16O as a Neutron Poison in AGB stars and Fluorine primary production at Halo Metallicities

Details The Role of Primary 16O as a Neutron Poison in AGB stars and Fluorine primary production at Halo Metallicities The Role of Primary 16O as a Neutron Poison in AGB stars and Fluorine primary production at Halo Metallicities

2010-05-17

arxiv.org/abs/1005.2845v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

6 pages, 6 figures, 4 tables

Scientific paper

The discovery of a historical bug in the s-post-process AGB code obtained so far by the Torino group forced us to reconsider the role of primary 16O in the 13C-pocket, produced by the 13C(a, n)16O reaction, as important neutron poison for the build up of the s-elements at Halo metallicities. The effect is noticeable only for the highest 13C-pocket efficiencies (cases ST*2 and ST). For Galactic disc metallicities, the bug effect is negligible. A comparative analysis of the neutron poison effect of other primary isotopes (12C, 22Ne and its progenies) is presented. The effect of proton captures, by 14N(n, p)14C, boosts a primary production of Fluorine in Halo AGB stars, with [F/Fe] comparable to [C/Fe], without affecting the s-elements production.

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