/ Experiment-Nucl arXiv:0812.1907

Performance of bare high-purity germanium detectors in liquid argon for the GERDA experiment

Heider, Marik Barnabe (Heidelberg, Max Planck Inst.) ; Cattadori, Carla (Gran Sasso) ; Chkvorets, Oleg (Heidelberg, Max Planck Inst.) ; Di Vacri, Assunta (Gran Sasso) ; Gusev, Konstantin (Dubna, JINR) ; Schonert, Stefan (Heidelberg, Max Planck Inst.) ; Shirchenko, Mark (Dubna, JINR)

Pages: 4

Abstract: The GERmanium Detector Array, GERDA, will search for neutrinoless double beta decay in 76Ge at the National Gran Sasso Laboratory of the INFN. Bare high-purity germanium detectors enriched in 76Ge will be submerged in liquid argon serving simultaneously as a shield against external radioactivity and as a cooling medium. In GERDA Phase-I, reprocessed enriched-Ge detectors, which were previously operated by the Heidelberg-Moscow and IGEX collaborations, will be redeployed. Before operating the enriched detectors, tests are performed with non-enriched bare HPGe detectors in the GERDA underground Detector Laboratory to test the Phase-I detector assembly, the detector handling protocols, the refurbishment technology and to study the long-term stability in liquid argon. The leakage currents in liquid argon and liquid nitrogen have been extensively studied under varying gamma irradiation conditions. In total three non-enriched high-purity p-type prototype germanium detectors have been operated successfully. The detector performance is stable over the long-term measurements. For the first time, performance of bare high-purity germanium detectors in liquid argon is reported.

Keyword(s): neutrinoless double beta decay ; GERDA ; HPGe detector ; liquid argon

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 Record created 2010-10-29, last modified 2013-11-12

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