Search for particles of cold nonbarion dark matter in the EDELWEISS-II experiment |
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Authors: | E A Yakushev V B Brudanin A V Lubashevskii S V Rozov S S Semikh and D V Filosofov |
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Institution: | (1) Max-Planck-Institut für Physik, Föhringer Ring 6, 80805 Munich, Germany;(2) Eberhard Karls Universität Tübingen, Auf der Morgenstelle 14, 72076 Tübingen, Germany |
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Abstract: | The EDELWEISS-II experiment is aimed at direct detection of weakly interacting massive particles (WIMP) considered as main
candidates for the role of nonbarion dark matter. In the experiment, a search for rare WIMP-Ge scattering events is performed
using HPGe-detectors-bolometers at a temperature of 20 mK. Because of different ionization losses of recoil nuclei and electrons,
the use of detectors allowing simultaneous measurement of phonon and ionization signals enables background events to be suppressed
very efficiently. To suppress actively the remained source of events simulating the WIMP signature, namely, the surface events
with incomplete charge collection, detectors with coplanar ring electrodes have been developed for the EDELWEISS-II facility.
The experimental coefficient of suppression of all EDELWEISS-II background components with the help of calibration measurements
allows 3500 kg⋅day statistics to be accumulated with the expected zero level of the background events in the region of search
for the WIMP. This enables the spinindependent WIMP-nucleon scattering events to be registered given that their cross section
is greater than 10-45 cm2 (10-9 pb) predicted by a wide class of the SUSY models. |
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