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Mainz 2014 – scientific programme

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T: Fachverband Teilchenphysik

T 65: Niederenergie-Neutrinophysik 3

T 65.4: Talk

Tuesday, March 25, 2014, 17:35–17:50, P106

42K background mitigation for GERDA Phase II — •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 neutrinoless double beta decay search. The search is performed using high purity germanium detectors operated in liquid argon (LAr). One of the most dangerous backgrounds in GERDA is the background from 42K which is a daughter isotope of cosmogenically produced 42Ar presented in natural argon. 42K ions collect on the surface of the detector and increase its background level. Developments of the suppression methods of such kind of background were performed at LArGe low-background test facility, which gives a possibility to operate bare detectors in about 1 m3 of LAr. It is equipped with scintillation veto, so particles which deposit part of their energy in LAr can be detected by 9 PMTs. It is located at LNGS underground laboratory close to GERDA experiment. In order to better understand background and to increase statistics the LAr of LArGe was spiked with specially produced 42Ar. Different experimental techniques were tested together with pulse shape dicrimination method and PMT veto in order to suppress 42K background. Obtained results show a possibility to suppress the background below the requirements for GERDA Phase II.

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