Frankfurt 2014 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 46: Poster

HK 46.30: Poster

Donnerstag, 20. März 2014, 16:00–18:00, HZ Poster

Production of ⁸⁵Kr — Stefan Fiebiger¹, •Zuzana Slavkovská¹, Ulrich Giesen², Michael Heil³, Ralf Plag^1,3, René Reifarth¹, Kerstin Sonnabend¹, and Benedikt Thomas¹ — ¹Goethe Universität Frankfurt — ²Physikalisch-Technische Bundesanstalt, Braunschweig — ³GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt

Neutron capture and β⁻-decay are competing branches of the s-process nucleosynthesis path at ⁸⁵Kr, which makes it an important branching point. The knowledge of its neutron capture cross section is therefore an essential tool to constrain stellar models of nucleosynthesis.
A ⁸⁵Kr sample can be produced via the irradiation of a stable, metallic ⁸²Se sample with α-beam. The gas stays trapped inside selenium as long as the temperature remains below 50^∘C. Fulfilling this temperature limit during the irradiation is one of the main technical difficulties during the production of ⁸⁵Kr.
Since the corresponding production cross sections are not known well enough, an experiment was performed at the PTB in Braunschweig, Germany. Various α-induced reactions on natural selenium were studied via the activation technique and the preliminary results are presented.
This project is supported by the ERC-consolidator project NAUTILUS.