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Experiment for direct detection of WIMP dark matter
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Home page for the EDELWEISS-III experiment

The Edelweiss experiment is dedicated to the direct detection of dark matter particles with bolometric detectors located at the underground laboratory of Modane (the LSM). The results of the stage II of this experiment are published, while the third phase is in scientific exploitation. On this Web site you will find the following sections:

Contact: J. Gascon (spokesperson)

"FID" Full InterDigit germanium bolometer The FID bolometers ready at Modane Final installation of the EDELWEISS-III setup

Limit on low-mass WIMPs with EDELWEISS-III, JCAP05 (2016) 019 Limits on the axion coupling to electrons (EDELWEISS-II data)

September 2015 - Preliminary results from a long EDELWEISS-III physics run

A long physics run ("Run 308") took place between Summer 2014 and Spring 2015. Preliminary results from a search for low-mass WIMPs were presented at the TAUP conference, using data taken during this run by 8 detectors. The derived limit on the WIMP-nucleon cross-section represents roughly an order-of-magnitude improvment with respect to EDELWEISS-II, for WIMP masses in the 5 to 30 GeV range. It now excludes completely all previous "low-mass WIMP" claims, which confirms results by the SuperCDMS experiment. A publication is in preparation, while further R&D is ongoing to drastically improve the detector sensitivity down to GeV WIMP masses.
Update Spring 2016 : the final result is published in JCAP05 (2016) 019 [arxiv:1603.05120]

Spring 2014 - End of EDELWEISS-III installation

The production of 36 massive bolometers equipped with the specific "FID" technology is done, as well as the preparation of an upgraded facility. The experiment is now ready for data taking...

Summer 2013 - Axion searches with the EDELWEISS-II experiment (arxiv:1307.1815)

For the first time, the EDELWEISS experiment presents new constraints on the coupling of axions or "ALP" particles. While EDELWEISS is primarily designed to search for WIMP-induced nuclear recoils, it is also sensitive to axion-induced electron recoils, thanks to its high-exposure, low background and good energy resolution. In this publication we used EDELWEISS-II data to place bounds on axion couplings using four different search channels. The main results are :

Summer 2012 - A search for low-mass WIMPs with EDELWEISS-II (arXiv:1207.1815)

We report on a search for low-energy (E < 20 keV) WIMP-induced nuclear recoils using data collected in 2009 - 2010 by EDELWEISS from four germanium detectors equipped with thermal sensors and an electrode design (ID) which allows to efficiently reject several sources of background. The data indicate no evidence for an exponential distribution of low-energy nuclear recoils that could be attributed to WIMP elastic scattering after an exposure of 113 kg.d. For WIMPs of mass 10 GeV, the observation of one event in the WIMP search region results in a 90% CL limit of 1.0x10^-5 pb on the spin-independent WIMP-nucleon scattering cross-section, which constrains the parameter space associated with the findings reported by the CoGeNT, DAMA and CRESST experiments.