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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 spectroscopy — Lukas Bott¹, •Alexander Robert Domula², Klaus Eberhardt³, Jan Glorius^{1, 4}, Kathrin Göbel¹, Tanja Heftrich¹, Kafa Khasawneh¹, Rene Reifarth¹, Stefan Schmidt¹, Kerstin Sonnabend¹, Mario Weigand¹, Norbert Wiehl³, Stephan Zauner³, Mathilde Ziegler-Himmelreich¹, and Kai Zuber² — ¹Goethe 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.