Karlsruhe 2011 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 108: Niederenergie-Neutrinophysik/Suche nach dunkler Materie V
T 108.3: Vortrag
Freitag, 1. April 2011, 14:35–14:50, 30.95: 121
Signal modeling of high–purity Ge detectors with a small read–out electrode and application to 76Ge double beta decay search — •Matteo Agostini1, Dusan Budjáš2, Calin A. Ur3, and Stefan Schönert1 — 1Lehrstuhl für experimentelle Physik und Astroteilchenphysik E15, Physikdepartment der Technischen Universität München — 2Max-Planck-Institut für Kernphysik — 3INFN Padova
The GERDA experiment searches for neutrinoless double beta (0νββ) decay of 76Ge using high–purity germanium detectors enriched in 76Ge. The analysis of the time structure of the signal provides a powerful tool to identify 0νββ decay events and to discriminate them from background. The enhanced pulse shape discrimination capabilities of Broad Energy Germanium (BEGe) detectors with a small read–out electrode have been recently reported. The full simulation of a thick–window BEGe detector response including the Monte Carlo modeling of radiation interaction and subsequent signal shape calculation will be discussed. A pulse shape discrimination method based on a cut on the ratio (A/E) between the maximum current signal amplitude (A) and the event energy (E) applied to the simulated data shows quantitative agreement with the experimental data acquired with calibration sources. The simulation has been used to study the survival probabilities of decays which occur inside the detector volume and which are difficult to assess experimentally. This includes the cosmogenic radio–isotopes 68Ge and 60Co and the 0νββ decay of 76Ge.