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.
Cite
@article{arxiv.astro-ph/9801199,
title = {Status of the EDELWEISS Experiment},
author = {L. Berge and I. Berkes and B. Chambon and M. Chapellier and G. Chardin and P. Charvin and M. De Jesus and P. Di Stefano and D. Drain and L. Dumoulin and C. Goldbach and A. Juillard and D. L'Hote and S. Marnieros and L. Miramonti and L. Mosca and X. -F. Navick and G. Nollez and P. Pari and C. Pastor and S. Pecourt and R. Tourbot and D. Yvon},
journal= {arXiv preprint arXiv:astro-ph/9801199},
year = {2009}
}
Comments
5 pages, 4 eps figures, LaTeX requires espcrc2.sty; Proceedings of TAUP97, Gran Sasso, Italy, September 7-11, 1997