Wuppertal 2015 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 10: Niederenergie Neutrinophysik I
T 10.4: Vortrag
Montag, 9. März 2015, 14:55–15:10, I.12.01 (HS 30)
Performance of GERDA Phase II BEGe Detectors — •Victoria Wagner for the GERDA collaboration — Max-Planck Institut für Kernphysik
The GERDA experiment searches for the lepton number violating neutrinoless double beta (0νββ) decay of 76Ge. GERDA uses HPGe detectors enriched in 76Ge as source and detection material. The experiment proceeds in two phases. In Phase I a background index of 10−2 cts/(keV·kg·yr) was reached and a new lower limit on the half-life of the 0νββ decay of 76Ge was set to 2.1 · 1025 yr (at 95% C.L.). In Phase II the background index will be lowered by an order of magnitude and a sensitivity of 1026 yr will be reached. In order to achieve this goal 30 new custom-made broad energy germanium (BEGe) detectors and a liquid argon scintillation light veto will be deployed. Five BEGe detectors have been operated successfully in Phase I and demonstrated their improved energy resolution and enhanced pulse shape discrimination (PSD) against background events. Special designed electronics will further improve energy resolution and PSD performance. The first results from commissioning of the new BEGe detectors will be presented in this talk.