Physics
Scientific paper
Aug 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002phrvc..66b5801w&link_type=abstract
Physical Review C, vol. 66, Issue 2, id. 025801
Physics
7
Radiative Capture, 90<=A<=149, Stellar Structure, Interiors, Evolution, Nucleosynthesis, Ages
Scientific paper
The neutron capture cross sections of 110Cd, 111Cd, 112Cd, 113Cd, 114Cd, and 116Cd have been measured in the energy range from 3 to 225 keV at the Karlsruhe 3.75 MV Van de Graaff accelerator. Neutrons were produced via the 7Li(p,n)7Be reaction by bombarding metallic Li targets with a pulsed proton beam. The Karlsruhe 4π barium fluoride detector was used for registration of capture events. The cross sections were determined relative to the gold standard using highly enriched metallic Cd samples. The respective ratios could be obtained with overall uncertainties between 0.8% and 1.6%, about an order of magnitude more accurate than previous data. Maxwellian averaged neutron capture cross sections were calculated for thermal energies between kT=8 keV and 100 keV. Discrepancies of 30% to 40% were found with respect to previous data. The new cross sections provide a reliable definition of the s-abundance pattern of the Cd isotopes, thus improving the corresponding r-process residuals, and, most importantly, the impact of s-only 110Cd as a normalization point for the overall distribution of the s abundances.
Käppeler Franz
Kazakov L. L.
Voss Florian
Wisshak K.
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