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TT: Tiefe Temperaturen

TT 13: Messger
äte, Kryotechnik

TT 13.5: Vortrag

Dienstag, 9. März 2004, 17:15–17:30, H20

Development of a cryogenic detection concept for GNO — •Tobias Lachenmaier, Jean-Côme Lanfranchi, Walter Potzel, and Franz von Feilitzsch — Technische Universität München, James-Franck-Str, 85748 Garching

The Gallium-Neutrino-Experiment GNO measures solar neutrinos radiochemically via the reaction ⁷¹Ga(ν,e)⁷¹Ge. In order to reduce statistical and systematic uncertainties in detecting the decay of ⁷¹Ge to ⁷¹Ga, a favourable way could be the use of high-resolution cryogenic detectors instead of the presently integrated miniaturized proportional counters. After the successful development of a highly efficient 4π-detector, optimization of thermal Ge-deposition, decoupling of deposition and detection, present activity concentrates on low background considerations, enhancement of external and internal shielding of the cryostat and a longterm run with artificially activated ⁷¹Ge to prove the feasibility of ’cryo-GNO’ in our Underground Laboratory in Garching.