Computer Science
Scientific paper
Oct 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996sncc.book.....b&link_type=abstract
Stellar neutron capture cross sections of the isotopes 164Er and 170Er., by Best, J.. Forschungszentrum Karlsruhe GmbH, Karlsru
Computer Science
7
Scientific paper
The stellar neutron capture cross sections of the isotopes 164Er and 170Er were determined via the activation technique. Neutron irradiations at the Karlsruhe van de Graaff accelerator resulted in stellar cross sections of >σ(170Er)<30keV = 170.2±7 mb and >σ(164Er)<30keV = 1084±51 mb with uncertainties that are smaller by factors 4 and 2, respectively, compared to previous data. The neutron cross section for 164Er was found to be significantly larger than reported in earlier measurements. The impact of this difference on the s-process branching at 163Dy was investigated with two s-process models. With the classical approach the isotopic abundance of 164Er can only be reproduced by assuming an electron density at the s-process site of ne = (1 - 5)·1026cm-3, significantly smaller than expected from current s-process scenarios. In contrast, the dynamical LMS (low mass star) model that postulates electron densities of about 1027cm-3 allows a satisfactory reproduction of the solar abundance of 164Er.
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