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The barium isotopes and more particularly the s-only nuclide (136)Ba represent a notable exception in the field of 2-process nucleosynthesis. In fact, calculations carried out both with the classical approach and with the model for helium shell burning in low mass AGB stars, point to a barium overproduction of at least 20% of the known solar abundance. The only way of reconciling calculations and meteoritic data would be to change accordingly the stellar neutron capture cross section of (136)Ba. Special emphasis was put on careful normalization to silver neutron capture. Capture areas were determined for neutron resonances up to 40 keV energy and the Maxwellian-averaged cross section was derived as a function of stellar temperature. The implications of the obtained results are discussed.

Additional information

Authors: CORVI F, JRC Geel (BE);MUTTI P, JRC Geel (BE);ATHANASSOPULOS K, JRC Geel (BE);BEER H, Forschungszentrum Karlsruhe GmbH (DE)
Bibliographic Reference: Paper presented : Nuclei in the Cosmos IV 1996, Notre Dame (US), 20-27 June 1996
Availability: Available from (1) as Paper EN 39928 ORA
Record Number: 199610932 / Last updated on: 1996-09-16
Original language: en
Available languages: en