Bochum 2009 – scientific programme

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HK: Fachverband Hadronen und Kerne

HK 28: Nuclear Astrophysics

HK 28.4: Talk

Tuesday, March 17, 2009, 15:15–15:30, H-ZO 60

Astrophysical S factor for α-capture on ¹¹⁵Sn — D. Filipescu¹, I. Cata-Danil¹, M. Ivascu¹, D. Bucurescu¹, N.V. Zamfir¹, T. Glodariu¹, L. Stroe¹, C. Mihai¹, N. Marginean¹, G. Cata-Danil², D.G. Ghita¹, R. Marginean¹, G. Suliman¹, T. Sava¹, and •S. Pascu¹ — ¹Horia-Hulubei National Institute for Physics and Nuclear Engineering, Magurele-Ilfov, Romania — ²Physics Department, University Politehnica of Bucharest, Romania

The s and r processes calculations can only account for 50% of the ¹¹⁵Sn abundance, and recent p process calculations cannot explain the remaining fraction. For this reason, the experimental measurement of the S factor of α capture on ¹¹⁵Sn is of high importance in explaining the origin of ¹¹⁵Sn. The cross section of ¹¹⁵Sn(α, γ)¹¹⁹Te reaction has been measured in the effective center of mass energy from 9.5 to 14.7 MeV. Enriched self-supporting ¹¹⁵Sn (56%) foils were bombarded with α beam delivered by the Bucharest IFIN-HH Tandem Accelerator. The induced activity of ¹¹⁹Te was measured with two large volume GeHP 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 potential.