Status of the EDELWEISS Experiment

Details Status of the EDELWEISS Experiment Status of the EDELWEISS Experiment

1998-01-21

arxiv.org/abs/astro-ph/9801199v1

Nucl.Phys.Proc.Suppl. 70 (1999) 69-73

Astronomy and Astrophysics

Astrophysics

5 pages, 4 eps figures, LaTeX requires espcrc2.sty; Proceedings of TAUP97, Gran Sasso, Italy, September 7-11, 1997

Scientific paper

10.1016/S0920-5632(98)00390-9

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.

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