The status of the EDELWEISS experiment, installed in the Fréjus tunnel, is presented. In its first stage, the experiment uses a 70 g high purity Ge bolometer with heat-ionization discrimination. Based on physics data, gamma and neutron calibrations, the influence of inverse bias voltage (−2 and −6 V) on incomplete surface charge collection, which limits at present the performances of these detectors, is presented. Analysing runs with a total exposure of 1.17 kg×day after cuts, an upper limit of 0.6 event day kg keV at 90% confidence level in the 12–70 keV recoil energy interval is obtained. Planned upgrades are summarized.
Status of the EDELWEISS experiment / D. Drain, A. Benoit, L. Bergé, I. Berkes, B. Chambon, M. Chapellier, G. Chardin, P. Charvin, M. De Jésus, P. Di Stefano, L. Dumoulin, C. Goldbach, J. -P. Hadjout, A. Juilliard, D. L’Hôte, J. Mallet, S. Marnieros, L. Miramonti, L. Mosca, X. -F. Navick, G. Nollez, P. Pari, C. Pastor, S. Pécourt, E. Simon, R. Turbot, L. Vagneron and D. Yvon. - In: PHYSICS REPORTS. - ISSN 0370-1573. - 307:1-4(1998 Dec), pp. 297-300.
Status of the EDELWEISS experiment
L. Miramonti;
1998
Abstract
The status of the EDELWEISS experiment, installed in the Fréjus tunnel, is presented. In its first stage, the experiment uses a 70 g high purity Ge bolometer with heat-ionization discrimination. Based on physics data, gamma and neutron calibrations, the influence of inverse bias voltage (−2 and −6 V) on incomplete surface charge collection, which limits at present the performances of these detectors, is presented. Analysing runs with a total exposure of 1.17 kg×day after cuts, an upper limit of 0.6 event day kg keV at 90% confidence level in the 12–70 keV recoil energy interval is obtained. Planned upgrades are summarized.
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