Heidelberg 2015 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 58: Nuclear Astrophysics 4

HK 58.1: Vortrag

Donnerstag, 26. März 2015, 17:00–17:15, K/HS2

Alpha-Induced Production Cross Sections of ^{77, 79}Kr and ⁷⁷Br — •Zuzana Slavkovská¹, Stefan Fiebiger¹, Ulrich Giesen², Tanja Heftrich¹, René Reifarth¹, Stefan Schmidt¹, Benedikt Thomas¹, and Mario Weigand¹ — ¹Goethe-Universität Frankfurt — ²Physikalisch-Technische Bundesanstalt, Braunschweig

Measurements of reaction cross sections help to constrain models predicting stellar reaction rates and can therefore improve our understanding of the stellar nucleosynthesis. The production cross sections of ^{77, 79}Kr and ⁷⁷Br following the α-irradiation of natural selenium were determined between the α-energies of 11 MeV and 15 MeV using the activation technique.

The irradiation of ^natSe targets with doubly-charged He²⁺ ions extracted from a cyclotron was conducted at Physikalisch-Technische Bundesanstalt in Braunschweig. The spectroscopic analysis of the reaction products was performed using a HPGe detector. As the α-beam was stopped inside the targets, the thick target yields were determined. The corresponding energy-dependent cross sections were calculated from the difference of the thick target yields at various beam energies. The determined values were compared to theoretical predictions based on the TALYS code.

This project was funded by the Europian Research Council under the European Union’s Seventh Framework Programme (FP/2007-2013)/ERC Grant Agreement n. 615126.