Bonn 2010 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 9: Astroteilchenphysik I

HK 9.3: Vortrag

Montag, 15. März 2010, 17:15–17:30, HG ÜR 5

Background by Neutron Activation in GERDA — •Georg Meierhofer¹, Lea Canella², Dennis Dietrich¹, Kai Freund¹, Peter Grabmayr¹, Alexander Hegai¹, Josef Jochum¹, Jan Jolie³, Markus Knapp¹, Petra Kudejova⁴, and Florian Ritter¹ — ¹Kepler Center for Astro and Particle Physics, Universität Tübingen — ²Institut für Radiochemie, Technische Universität München — ³Institut für Kernphysik, Universität zu Köln — ⁴FRM II, Technische Universität München

The observation of the neutrinoless double beta decay is a proof of the Majorana nature of the neutrino. The long half-life of this decay requires experiments of very low background rates in the region of interest at Q_ββ. Prompt γ-rays after neutron capture on germanium and the β-decay of ⁷⁷Ge contribute to the background in experiments using ⁷⁶Ge for the search of the neutrinoless double beta decay.
The poorly known prompt γ-ray spectra and the neutron capture cross sections for the (n,γ) reactions of ⁷⁴Ge and ⁷⁶Ge were measured at the research reactor FRM II (Munich). The obtained data are needed in MC simulations for qualitative and quantitative background prediction in the Gerda experiment [1]. The data and their implication on the background in Gerda will be presented.

[1] GERDA, Proposal to LNGS, 2004
This work was supported by BMBF (05A08VT1).