Wuppertal 2015 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 10: Niederenergie Neutrinophysik I
T 10.3: Gruppenbericht
Montag, 9. März 2015, 14:35–14:55, I.12.01 (HS 30)
Status of the GERDA Phase II experiment aimed for the 0νββ decay search. — •Alexey Lubashevskiy for the GERDA collaboration — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg, Germany
GERDA is a low background experiment aimed for the 0νββ search. It is located at LNGS underground laboratory in Italy. The search is performed using enriched in 76Ge high purity germanium detectors operated in liquid argon (LAr). This allowed us to reduce background from detector‘s surrounding and achieve the background index of 10−2 cts/(keV·kg·yr). This is about one order of magnitude better then in predecessor experiments with HPGe detectors. Accumulated statistic allows to put the most stringent limit on the half-life of 0νββ decay of 76Ge, T1/2 = 2.1·1025 yr. Currently the preparations for Phase II are ongoing. LAr scintillation veto has been recently installed in GERDA. 20 kg of new type BEGe detectors with powerful pulse shape discrimination capability and better energy resolution will be incorporated in the setup soon. We expect that usage of the new active background reduction techniques and cleaner materials would allow us to achieve a background index of 10−3 cts/(keV·kg·yr) and significantly increase sensitivity of the experiment. Actual status of the experiment will be presented.