Freiburg 2008 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 30: Neutrinophysik mit Beschleunigern I

T 30.7: Vortrag

Montag, 3. März 2008, 18:30–18:45, KGI-HS 1224

Estimate of the Internal Gamma Background of the GERDA Experiment — Iris Abt, Jozsef Janicsko, •Daniel Lenz, Jing Liu, Xiang Liu, Bela Majorovits, and Jens Schubert for the GERDA collaboration — Max-Planck-Institut für Physik, Föhringer Ring 6, 80805 München

The GERmanium Detector Array, GERDA, is designed for the search for "neutrinoless double beta decay" (0νββ) of ⁷⁶Ge. Germanium detectors enriched in the isotope ⁷⁶Ge are used. Since 0νββ is a rare second order electroweak process, a very low background count rate around the Q-value is crucial. The GERDA experiment is constructed underground in the LNGS. The LNGS has an overburden of rock of approximatly 3800 meters water equivalent, thus reducing the flux of cosmic muons by 6 orders of magnitude. An outer water shield with 10m diameter and an inner 4m diameter cryogenic liquid argon shield are used to reduce the enivronmental particle flux reaching the detectors. The amount of material close to the detectors is reduced to a minimum and only radiopure material are used. The overall background count rate and spectrum from the detector strings determined by the Geant4 based simulation package MaGe will be discussed.