Neutron capture cross sections of 86Sr and 87Sr from 100 eV to 1 MeV, the conditions for the astrophysical s process, and the 87-87Sr cosmochronometer

Physics – Nuclear Physics

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Radiative Capture, 59<=A<=89, Stellar Structure, Interiors, Evolution, Nucleosynthesis, Ages, Origin, Formation, And Abundances Of The Elements

Scientific paper

The neutron-capture cross sections for 86,87Sr have been measured by the neutron-time-of-flight technique from 100 eV to 1 MeV. Maxwellian-averaged capture cross sections have been determined for stellar temperatures ranging from kT=10 to 100 keV. At kT=30 keV we obtain 70+/-4 and 97+/-5 mb for 86Sr and 87Sr, respectively. These cross sections are combined with other existing data to deduce values for the stellar neutron density and temperature during s-process nucleosynthesis and to analyze the viability of the 87-87Sr chronometric pair as a means to determine the age of the Galaxy.

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