Astrophysical S factor for α capture on Sn117

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3H-, 3He-, And 4He-Induced Reactions, 90<=A<=149, Nucleosynthesis In Novae, Supernovae, And Other Explosive Environments, Statistical Theory And Fluctuations

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The cross sections of the Sn117(α,γ) Te121 and Sn117(α,p) Sb120 reactions have been measured in the effective center of mass energy from 11.5 to 14.6 MeV. Highly enriched self-supporting Sn117 (90%) foils were bombarded with an α beam delivered by the Bucharest IFIN-HH tandem accelerator. The induced activity of Te121 and Sb120 was measured with two large-volume high-purity Ge detectors in close geometry to maximize the detector efficiency. The experimental cross section and astrophysical S factor are compared with statistical model predictions for different global α-nucleus optical potentials.

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