Status of the EDELWEISS Experiment

Abstract : The status of the EDELWEISS experiment (underground dark matter search with heat-ionisation bolometers) is reviewed. Auspicious results achieved with a prototype 70 g Ge heat-ionisation detector under a 2 V reverse bias tension are discussed. Based on gamma and neutron calibrations, a best-case rejection factor, over the 15-45 keV range, of 99.7 % for gammas, with an acceptance of 94 % for neutrons, is presented first. Some operational results of physical interest obtained under poor low radioactivity conditions follow. They include a raw event rate of around 30 events/day/kg/keV over the same energy range, and, after rejection of part of the background, lead to a conservative upper limit on the signal of approximately 1.6 events/day/kg/keV at a 90 % confidence level. Performance degrading surface effects of the detector are speculated upon; and planned upgrades are summarized.
docType_s : Conference papers
Domain :
Contributor : Florès Sylvie <>
Submitted on : Wednesday, December 2, 1998 - 4:00:24 PM
Last modification on : Wednesday, December 2, 1998 - 4:00:24 PM



L. Bergé, I. Berkes, B. Chambon, M. Chapellier, G. Chardin, et al.. Status of the EDELWEISS Experiment. International Workshop on Topics in Astroparticle and Underground Physics (TAUP 97) 5, Sep 1997, Gran Sasso, Italy. 70, pp.69-73, 1999. <in2p3-00003429>