Münster 2017 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 61: Structure and Dynamics of Nuclei X

HK 61.5: Vortrag

Freitag, 31. März 2017, 15:00–15:15, F 33

Low-Level-Counting of an 129I-sample with high-precission X-Ray spectroscopyLukas Bott1, •Alexander Robert Domula2, Klaus Eberhardt3, Jan Glorius1, 4, Kathrin Göbel1, Tanja Heftrich1, Kafa Khasawneh1, Rene Reifarth1, Stefan Schmidt1, Kerstin Sonnabend1, Mario Weigand1, Norbert Wiehl3, Stephan Zauner3, Mathilde Ziegler-Himmelreich1, and Kai Zuber21Goethe University Frankfurt, Germany — 2TU Dresden, Germany — 3University of Mainz, Germany — 4GSI Darmstadt, Germany

The exact half-life-determination of beta decays plays an important role in modern physics - amongst others for dating or the understanding of nucleosynthesis. The progress in instrumentation and technology during the last decade suggested a re-measurement of previously investigated nuclides with reduced systematic and statitical uncertainties. One possible access to a nuclides half-live is given by the activity of a suitable, well characterised sample. In order to determine the activity of the long-lived nuclide 129I, an adequate sample was produced via neutron irradiation of 128Te at the TRIGA reactor Mainz. The long-lived activity of the sample was characterised via γ- and X-Ray-spectroscopy at the "Niederniveau-Messlabor-Felsenkeller (VKTA)" in Dresden. The reduced background from cosmic-radiation, in particular muon-induced background in the underground laboratory enables the detection of very low activities. The results from 129I activity measurements with a high-resolution Silicon-Drift-Detector at low-background-conditions and a corresponding half-life estimation will be presented.

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