Bonn 2010 – scientific programme

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T: Fachverband Teilchenphysik

T 107: Niederenergie-Neutrinophysik und Suche nach dunkler Materie I

T 107.1: Group Report

Monday, March 15, 2010, 16:45–17:05, HG XI

First results of the EDELWEISS-II Dark Matter search with ID-type Ge bolometers — •Valentin Kozlov — Karlsruher Institut für Technologie, Institut für Kernphysik, Postfach 3640, 76021 Karlsruhe

EDELWEISS-II is a direct Dark Matter search experiment located in the underground laboratory, Laboratoire Souterrain de Modane (LSM, France). Recently, the collaboration has developed new cryogenic detectors with interleaved electrodes (ID design) for an improved background rejection (Phys. Lett. B681 (2009) 305). A continuous operation of ten of these bolometers at LSM together with an active muon veto shielding has been achieved. First results based on an effective exposure of 144 kg·d taken in 2009 have been published recently (arXiv:0912.0805). The acquired data correspond to an improvement in sensitivity of almost 20 compared to EDELWEISS-I. We present and discuss the latest bolometer data including the identification of muon-induced background events and special measurement of muon-induced neutrons in LSM.

This work is supported in part by the German Research Foundation (DFG) through its collaborative research center SFB-TR27 ("Neutrinos and Beyond") and by Agence Nationale pour la Recherche.