Bonn 2010 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 9: Astroteilchenphysik I
HK 9.3: Talk
Monday, March 15, 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 Qββ. 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).