version française rss feed
HAL : in2p3-00003429, version 1

Fiche détaillée  Récupérer au format
International Workshop on Topics in Astroparticle and Underground Physics (TAUP 97) 5, Gran Sasso : Italie
Status of the EDELWEISS Experiment
L. Bergé1, I. Berkes2, B. Chambon2, M. Chapellier, G. Chardin, P. Charvin, M. De Jésus2, P D. Stefano, D. Drain2, L. Dumoulin1, C. Goldbach, J.-P. Hadjout2, A. Juillard1, D. L'Hôte, S. Marnieros1, L. Miramonti, L. Mosca, X F. Navick, G. Nollez, P. Pari, C. Pastor2, S. Pécourt2, R. Tourbot, D. Yvon
EDELWEISS Collaboration(s)

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.
1 :  CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
2 :  IPNL - Institut de Physique Nucléaire de Lyon
Physique/Astrophysique/Cosmologie et astrophysique extra-galactique
Lien vers le texte intégral :