Mainz 2014 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
T: Fachverband Teilchenphysik
T 105: Experimentelle Methoden der Astroteilchenphysik 4
T 105.4: Vortrag
Donnerstag, 27. März 2014, 17:30–17:45, P7
Normalization procedure of Pulse Shape Discrimination for Broad Energy Germanium Detector — •heng-ye liao for the GERDA collaboration — Max-Planck-Institut für Physik, Germany
First results on the half life of neutrinoless double beta decay for the Gerda (GERmanium Detector Array) Phase I have been published. 0νββ events are single-site events (SSE) confined to a volume of about one millimeter. However, a significant fraction of background events in the ROI are multi-site events (MSE). Broad Energy Germanium detectors (BEGes) provide very good pulse shape recognition efficiencies of signal-like events and background-like events. Using this detector type for the second Phase of the Gerda experiment offers the potential to reduce the background index from 10−2 cts/(keV·kg·yr) to 10−3cts/(keV·kg·yr). A total exposure of 2.4 kg·yr was taken with four BEGe detectors. Data analysis procedures to enhance the PSD performance have been implemented. The working principle, normalization procedure for the energy dependence of PSD and the deviations between physics data and calibration data will be presented.