Stellar neutron capture cross sections of the tin isotopes

Details Stellar neutron capture cross sections of the tin isotopes Stellar neutron capture cross sections of the tin isotopes

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996phrvc..54.1451w&link_type=abstract

Physical Review C (Nuclear Physics), Volume 54, Issue 3, September 1996, pp.1451-1462

Physics

Nuclear Physics

22

Radiative Capture, Hydrostatic Stellar Nucleosynthesis, 90<=A<=149, Origin, Formation, And Abundances Of The Elements

Scientific paper

The neutron capture cross sections of 114Sn, 115Sn, 116Sn, 117Sn, 118Sn, and 120Sn were 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 using a pulsed proton beam. Capture events were registered with the Karlsruhe 4π barium fluoride detector. The experiment was complicated by the small (n,γ) cross sections of the proton magic tin isotopes and by the comparably low enrichment of the rare isotopes 114Sn and 115Sn. Despite significant corrections for capture of scattered neutrons and for isotopic impurities, the high efficiency and the spectroscopic quality of the BaF2 detector allowed the determination of the cross-section ratios with overall uncertainties of 1-2 %, five times smaller compared to existing data. Based on these results, Maxwellian averaged (n,γ) cross sections were calculated for thermal energies between kT=10 and 100 keV. These data are used for a discussion of the solar tin abundance and for an improved determination of the isotopic s- and r-process components.

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