Cryogenic Ge Detectors for Dark Matter Search: Surface Event Rejection with Ionization Signals |
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Authors: | X Defay A Broniatowski A Juillard S Marnieros M Chapellier L Dumoulin S Collin L Bergé F Lalu X F Navick |
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Affiliation: | (1) Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, CNRS-IN2P3, Bat. 108, 91405 Orsay Cedex, France;(2) Centre d’Etudes Nucléaires de Saclay, CEA/DSM/DAPNIA, 91191 Gif-sur-Yvette Cedex, France |
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Abstract: | A new design of an ionization-heat germanium detector for dark matter search is presented, based on the use of interleaved
electrodes for charge collection. This device allows active rejection of surface events by performing the appropriate cuts
in the charge measurement data. Test experiments were performed with a prototype device, fitted with annular collection electrodes
and with a neutron transmutation-doped Ge thermometer. Calibration runs with gamma and neutron sources demonstrate the remarkable
possibilities offered by this type of detector in terms of surface event discrimination.
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Keywords: | Germanium cryogenic detectors Dark matter Surface event discrimination |
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