Stellar neutron capture cross sections of the Yb isotopes

Details Stellar neutron capture cross sections of the Yb isotopes Stellar neutron capture cross sections of the Yb isotopes

Jun 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000phrvc..61f5801w&link_type=abstract

Physical Review C (Nuclear Physics), Volume 61, Issue 6, June 2000, id.065801

Physics

Nuclear Physics

10

Radiative Capture, Hydrostatic Stellar Nucleosynthesis, 150<=A<=189, Stellar Structure, Interiors, Evolution, Nucleosynthesis, Ages, Radiative Capture, Hydrostatic Stellar Nucleosynthesis, 150<=A<=189, Stellar Structure, Interiors, Evolution, Nucleosynthesis, Ages

Scientific paper

The neutron capture cross sections of 170Yb, 171Yb, 172Yb, 173Yb, 174Yb, and 176Yb have been measured in the energy range from 3 to 225 keV relative to the gold standard. Neutrons were produced at the Karlsruhe 3.75 MV Van de Graaff Accelerator via the 7Li(p,n)7Be reaction by bombarding metallic Li targets with a pulsed proton beam, and capture events were registered with the Karlsruhe 4π Barium Fluoride Detector. Neutron capture in the even ytterbium isotopes is characterized by a strong population of isomeric states, leading to unrecognized systematic uncertainties in previous measurements. For the first time, partial cross sections to ground and isomeric states could be experimentally identified in neutron time-of-flight measurements for 172Yb, 173Yb, 174Yb, and 176Yb. The present overall uncertainties of (1-1.5) % correspond to an improvement by factors of 4-10 compared to existing data. Maxwellian averaged neutron capture cross sections were calculated for thermal energies between kT=8 keV and 100 keV. In four cases, the results differ by more than 15% from recent evaluations. The s-process analyses based on the present data provide further evidence in favor of stellar models for thermally pulsing low-mass asymptotic giant branch stars.

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