Physics – Nuclear Physics
Scientific paper
Feb 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988phrvc..37..595r&link_type=abstract
Physical Review C (Nuclear Physics), Volume 37, Issue 2, February 1988, pp.595-604
Physics
Nuclear Physics
128
Nucleon-Induced Reactions, 190<=A<=219, Stellar Structure, Interiors, Evolution, Nucleosynthesis, Ages
Scientific paper
We have measured the neutron capture cross section of gold using the 7Li(p,n)7Be reaction for neutron production. This reaction not only provides the integrated neutron flux via the 7Be activity of the target, but also allows for the simulation of a Maxwellian neutron energy spectrum at kT=25 keV. As this spectrum is emitted in a forward cone of 120° opening angle, the cross section can be measured in good geometry and independent of any other standard. Systematic uncertainties were studied experimentally in a series of activations. The final stellar cross section at kT=25 keV was found to be 648+/-10 mb, and extrapolation to the common s-process temperature kT=30 keV yields 582+/-9 mb. This result is used for renormalization of a number of cross sections which had been measured relative to gold.
Käppeler Franz
Ratynski W.
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