Physics
Scientific paper
Jul 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010phrvc..82a5803m&link_type=abstract
Physical Review C, vol. 82, Issue 1, id. 015803
Physics
6
Inelastic Neutron Scattering, S-Process, 150<=A<=189, Stellar Structure, Interiors, Evolution, Nucleosynthesis, Ages
Scientific paper
The inelastic neutron-scattering cross section of Os187 has been determined in a time-of-flight experiment at the Karlsruhe 3.7-MV Van de Graaff accelerator. An almost monoenergetic beam of 30-keV neutrons was produced at the threshold of the Li7(p,n)Be7 reaction. Information on the inelastic channel is required for reliable calculations of the so-called stellar enhancement factor, by which the laboratory cross section of Os187 must be corrected in order to account for the thermal population of low-lying excited states at the temperatures of s-process nucleosynthesis, in particular of the important state at 9.75 keV. This correction represents a crucial step in the interpretation of the Os187/Re187 pair as a cosmochronometer.
Heil Matthias
Käppeler Franz
Mengoni Alberto
Mosconi Mirta
Plag Ralf
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