Final results of the EDELWEISS-II WIMP search using a 4-kg array of cryogenic germanium detectors with interleaved electrode

Valentin Kozlov
Karlsruhe Institute of Technology, Germany


EDELWEISS-2 is a Ge-bolometer experiment searching for WIMP dark matter and located in the underground laboratory, Laboratoire Souterrain de Modane (LSM, France). Recently, the collaboration has developed new cryogenic detectors with an improved background rejection (interleaved electrodes design, Phys. Lett. B681 (2009) 305). A continuous operation of ten of these 400g bolometers at LSM together with an active muon veto shielding has been achieved. Results based on a total effective exposure of 384 kg*d taken in 2009/2010 have been published recently (arXiv:1103.4070 ). A cross-section for spin-independent scattering of WIMPs on the nucleon of 4.4e-8 pb is excluded at 90%CL for a WIMP mass of 85 GeV. New constraints are also set on models where the WIMP-nucleon scattering is inelastic. These bolometer data and the latest measurements with 800g detectors are presented and discussed.