Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-05-04
Astrophys.J. 614 (2004) 363-370
Astronomy and Astrophysics
Astrophysics
24 pages, 9 figures, accepted for publication in Astophysical Journal
Scientific paper
10.1086/422206
The s-process branching at 128I has been investigated on the basis of new, precise experimental (n,g) cross sections for the s-only isotopes 128Xe and 130Xe. This branching is unique, since it is essentially determined by the temperature- and density-sensitive stellar decay rates of 128I and only marginally affected by the specific stellar neutron flux. For this reason it represents an important test for He-shell burning in AGB stars. The description of the branching by means of the complex stellar scenario reveals a significant sensitivity to the time scales for convection during He shell flashes, thus providing constraints for this phenomenon. The s-process ratio 128Xe/130Xe deduced from stellar models allows for a (9+-3)% p-process contribution to solar 128Xe, in agreement with the Xe-S component found in meteoritic presolar SiC grains.
Gallino Roberto
Kaeppeler Franz
Pignatari Marco
Reifarth Rene
Straniero Oscar
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