Neutron capture in low mass Asymptotic Giant Branch stars: cross sections and abundance signatures

Details Neutron capture in low mass Asymptotic Giant Branch stars: cross sections and abundance signatures Neutron capture in low mass Asymptotic Giant Branch stars: cross sections and abundance signatures

1999-06-16

arxiv.org/abs/astro-ph/9906266v1

Astrophys.J.525:886-900,1999

Astronomy and Astrophysics

Astrophysics

49 pagg., 5 figg., accepted for publication by ApJ

Scientific paper

10.1086/307938

The recently improved information on the stellar (n,gamma) cross sections of neutron-magic nuclei at N = 82, and in particular of 142Nd, turned out to represent a sensitive test for models of s-process nucleosynthesis. While these data were found to be incompatible with the classical approach based on an exponential distribution of neutron exposures, they provide significantly better agreement between the solar abundance distribution of s nuclei and the predictions of models for low mass AGB stars. Particular attention is paid to a consistent description of s-process branchings in the region of the rare earth elements. It is shown that - in certain cases - the nuclear data are sufficiently accurate that the resulting abundance uncertainties can be completely attributed to stellar modelling. Thus, the s process becomes important for testing the role of different stellar masses and metallicities as well as for constraining the assumptions for describing the low neutron density provided by the 13C source.

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