Development of Ge/NbSi detectors for EDELWEISS-II with identification of near-surface events

✍ Scribed by A. Juillard; S. Marnieros; Y. Dolgorouky; L. Bergé; S. Collin; S. Fiorucci; F. Lalu; L. Dumoulin

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 552 KB
• Volume: 559
• Category: Article
• ISSN: 0168-9002
• DOI: 10.1016/j.nima.2005.12.019

✦ Synopsis

The actual limitation of Ge ionization heat cryogenic detectors for direct WIMP detection such as EDELWEISS arises from incomplete charge collection for near-surface events. We present results on Ge/NbSi detectors that are fitted with segmented electrodes and two NbSi Anderson insulator thermometric layers. Three such bolometers were studied in the low-background cryostat of the EDELWEISS collaboration in the LSM: analysis of the athermal signals allows us to identify and reject events occurring in the first millimeter under the electrodes.