Computer Science
Scientific paper
Nov 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998sncc.book.....w&link_type=abstract
Stellar neutron capture cross sections of the Yb isotopes., by Wisshak, K.; Voss, F.; Käppeler, F.; Kazakov, L.. Forschungszent
Computer Science
1
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 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. Capture events were registered with the Karlsruhe 4π barium fluoride detector. The cross sections were determined relative to the gold standard. Neutron capture in the even ytterbium isotopes is characterized by a strong population of isomeric states, resulting in severe systematic uncertainties in previous experiments. In the present work, the partial cross sections to the ground- and isomeric states in 172Yb, 174Yb, 176Yb could be experimentally separated for the first time, yielding cross section ratios with an overall uncertainty of 1 - 1.5%. Compared to previous measurements, this corresponds to an improvement by factors of 4 to 10. Maxwellian averaged neutron capture cross sections were calculated for thermal energies between kT = 8 keV and 100 keV. The results of four isotopes differ by more than 15% from recent evaluations.
Käppeler Franz
Kazakov L. L.
Voss Florian
Wisshak K.
No associations
LandOfFree
Stellar neutron capture cross sections of the Yb isotopes. does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Stellar neutron capture cross sections of the Yb isotopes., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Stellar neutron capture cross sections of the Yb isotopes. will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-805092