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Surface event rejection of the EDELWEISS cryogenic germanium detectors based on NbSi thin film sensors

S. Marnieros 1 L. Berge 2 A. Broniatowski 2 M. Chapellier 2 S. Collin 2 O. Crauste 2 X. Defay 2 Y. Dolgorouky 2 L. Dumoulin 2 A. Juillard 2 F. Lalu 2 C. Nones 2 E. Olivieri 2
1 PS1
CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
2 CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
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 Cd-109 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.
Keywords : Dark matter cryogenic detectors Ge bolometer surface event rejection NbSi thermistor
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Contributor : Christine Hadrossek <>
Submitted on : Wednesday, August 28, 2013 - 2:03:15 PM
Last modification on : Wednesday, September 16, 2020 - 5:43:30 PM

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S. Marnieros, L. Berge, A. Broniatowski, M. Chapellier, S. Collin, et al.. Surface event rejection of the EDELWEISS cryogenic germanium detectors based on NbSi thin film sensors. Journal of Low Temperature Physics, Springer Verlag (Germany), 2008, 151, pp.835-840. ⟨10.1007/s10909-008-9753-2⟩. ⟨in2p3-00854953⟩

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