Heidelberg 2007 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 502: Niederenergetische Neutrinos II

T 502.5: Vortrag

Freitag, 9. März 2007, 15:05–15:20, INF 308 Kl. HS

Operation of a GERDA phase I prototype detector in liquid argon and nitrogen — •Marik Barnabe Heider¹, Oleg Chkvorets¹, Konstantin Gusev², Stefan Schoenert¹, and Mark Schrichenko² for the GERDA collaboration — ¹Max-Planck-Institut für Kernphysik, Heidelberg, Germany — ²Joint Institute for Nuclear Research (JINR), Dubna, Russia

A GERDA phase I prototype detector, consisting of a bare non-enriched high-purity (HP) p-type germanium diode mounted in a low mass holder has been operated both in liquid nitrogen and liquid argon. Because of its high density, liquid argon has been selected as cryogenic liquid and shield for GERDA experiment. The testing of this detector assembly has been carried out in the underground detector laboratory at LNGS, and at the detector manufacturer. The best resolution achieved is 2.2 keV FWHM at 1.332 MeV, which is the same as the resolution measured in a standard test cryostat. The long-term measurements with the prototype detector are performed in liquid argon. Up to now, 38 thermal cycles have been carried out with this detector. The operations, measurements and results of the prototype detector testing will be summarized.