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Bochum 2009 – wissenschaftliches Programm

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HK: Fachverband Hadronen und Kerne

HK 28: Nuclear Astrophysics

HK 28.4: Vortrag

Dienstag, 17. März 2009, 15:15–15:30, H-ZO 60

Astrophysical S factor for α-capture on 115SnD. 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. Pascu11Horia-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.

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