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Title: Surface events identification in the EDELWEISS germanium bolometers

Abstract

In the first phase of the EDELWEISS-II Dark Matter search, 23 germanium detectors with NTD thermal sensors and 7 detectors with NbSi thin films are going to be used at 20mK for the direct detection of WIMPs. In this paper, we are describing the different techniques of identification of surface events that might improve strongly the physics results of this experiment.

Authors:
 [1]
  1. C.E.A, Centre d'Etudes Nucleaires de Saclay, DSM/DAPNIA, 91191 Gif sur Yvette cedex (France)
Publication Date:
OSTI Identifier:
21055030
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 897; Journal Issue: 1; Conference: LRT 2006: Topical workshop on low radioactivity techniques, Aussois (France), 1-4 Oct 2006; Other Information: DOI: 10.1063/1.2722070; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; BOLOMETERS; GE SEMICONDUCTOR DETECTORS; NIOBIUM SILICIDES; NONLUMINOUS MATTER; PARTICLE IDENTIFICATION; RADIATION DETECTION; SENSORS; SURFACES; THIN FILMS; WEAK INTERACTIONS

Citation Formats

Navick, X.-F.. Surface events identification in the EDELWEISS germanium bolometers. United States: N. p., 2007. Web. doi:10.1063/1.2722070.
Navick, X.-F.. Surface events identification in the EDELWEISS germanium bolometers. United States. doi:10.1063/1.2722070.
Navick, X.-F.. Wed . "Surface events identification in the EDELWEISS germanium bolometers". United States. doi:10.1063/1.2722070.
@article{osti_21055030,
title = {Surface events identification in the EDELWEISS germanium bolometers},
author = {Navick, X.-F.},
abstractNote = {In the first phase of the EDELWEISS-II Dark Matter search, 23 germanium detectors with NTD thermal sensors and 7 detectors with NbSi thin films are going to be used at 20mK for the direct detection of WIMPs. In this paper, we are describing the different techniques of identification of surface events that might improve strongly the physics results of this experiment.},
doi = {10.1063/1.2722070},
journal = {AIP Conference Proceedings},
number = 1,
volume = 897,
place = {United States},
year = {Wed Mar 28 00:00:00 EDT 2007},
month = {Wed Mar 28 00:00:00 EDT 2007}
}
  • The CDMS and EDELWEISS collaborations have combined the results of their direct searches for dark matter using cryogenic germanium detectors. The total data set represents 614 kg/days equivalent exposure. A straightforward method of combination was chosen for its simplicity before data were exchanged between experiments. The results are interpreted in terms of limits on spin-independent weakly interacting, massive particle (WIMP)-nucleon cross section. For a WIMP mass of 90 GeV/c{sup 2}, where this analysis is most sensitive, a cross section of 3.3 x 10{sup -44} cm{sup 2} is excluded at 90% C.L. At higher WIMP masses, the combination improves the individualmore » limits, by a factor 1.6 above 700 GeV/c{sup 2}. Alternative methods of combining the data provide stronger constraints for some ranges of WIMP masses and weaker constraints for others.« less
  • The latest results obtained by the EDELWEISS WIMP (weakly interacting massive particles) direct detection experiment using three heat-and-ionization 320-g germanium bolometers are given. Presently the most sensitive WIMP direct detection experiment for WIMP mass >30 GeV, EDELWEISS-I is testing a first region of SUSY models compatible with accelerator constraints. The status and main characteristics of EDELWEISS-II, involving in a first stage 28 germanium bolometers and able to accommodate up to 120 detectors, are briefly presented, together with neutron background estimates.