Surface Event Rejection of the EDELWEISS Cryogenic Germanium Detectors Based on NbSi Thin Film Sensors |
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Authors: | S Marnieros L Berge A Broniatowski M Chapellier S Collin O Crauste X Defay Y Dolgorouky L Dumoulin A Juillard F Lalu C Nones E Olivieri |
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Affiliation: | (1) Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, CNRS-IN2P3, Bat. 108, 91405 Orsay Cedex, France |
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Abstract: | Near-surface-events are a major limitation to the performance of cryogenic massive germanium heat and ionisation detectors
for dark matter search, due to their incomplete charge collection. We present here a powerful method of surface event identification
based on the transient heat signal of a Ge bolometer, equipped with two NbSi high impedance thin film sensors. Calibration
runs using electrons and low energy gamma particles from a 109Cd source show highly effective surface event rejection down to the heat threshold energy. Neutron and gamma source calibrations
were realised to get information on the fiducial volume of the Ge absorber. First results from low background data taking
are discussed. |
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Keywords: | Dark matter Cryogenic detectors Ge bolometer Surface event rejection NbSi thermistor |
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