Mathematics – Logic
Scientific paper
Aug 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009phrvc..80b5804m&link_type=abstract
Physical Review C, vol. 80, Issue 2, id. 025804
Mathematics
Logic
1
Radiative Capture, Explosive Burning In Supernovae Shock Fronts, 150<=A<=189
Scientific paper
The neutron capture cross sections of W184 and W186 have been determined by means of the activation technique. The measurements were carried out at the Karlsruhe 3.75-MV Van de Graaff accelerator using the Li7(p,n)Be7 reaction for neutron production. Samples of natural composition were irradiated in a quasistellar neutron spectrum for a thermal energy of kT=25 keV. Systematic uncertainties were investigated by variation of the experimental parameters in repeated activations. The induced activities were counted with HPGe detectors via the strongest γ-ray lines in the decay of the respective product nuclei. The measured data were converted into Maxwellian averaged cross sections at kT=30 keV, yielding 221±12 mb and 231±11 mb for W184 and W186, respectively. Together with the result of a previously reported measurement on W180, the present values can be used to improve the cross-section trend with neutron number, which is important for extrapolation into the regions of unstable isotopes. These results are of interest for stellar and explosive nucleosynthesis in nuclear astrophysics as well as for technological applications.
Dillmann Iris
Domingo Pardo C.
Käppeler Franz
Marganiec Justyna
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