Searcharxiv⌕ Search

arXiv subjects

V. Y. Kozlov

Publications and source records attributed to V. Y. Kozlov.

2 recordsLinked to original sources
arXiv2013

Recent status of the Dark Matter search with Edelweiss

The Edelweiss experiment uses Ge-bolometers with an improved background rejection (interleaved electrode design) to search for WIMP dark matter. The setup is located in the underground laboratory, Laboratoire Souterrain de Modane (LSM, France). In 2009-2010 the collaboration successfully operated ten 400-g bolometers together with an active muon veto shielding. Published analysis of this measurement campaign was optimized for WIMP masses above 50 GeV. Recently, the analysis was extended to the low-mass WIMP region using a quality subset of the 2009-2010 data setting new limits on the spin-independent WIMP-nucleon scattering cross-section. We present the low-mass WIMP analysis, background investigations and the latest measurements with a subset of the forty 800-g detectors that will be installed for the Edelweiss-III. Ongoing installation works of the Edelweiss-III setup and further plans for a next generation experiment, EURECA, are discussed.

astro-ph.CO↗
arXiv2013

Muon-induced background in the EDELWEISS dark matter search

A dedicated analysis of the muon-induced background in the EDELWEISS dark matter search has been performed on a data set acquired in 2009 and 2010. The total muon flux underground in the Laboratoire Souterrain de Modane (LSM) was measured to be $Φ_μ=(5.4\pm 0.2 ^{+0.5}_{-0.9})$\,muons/m$^2$/d. The modular design of the muon-veto system allows the reconstruction of the muon trajectory and hence the determination of the angular dependent muon flux in LSM. The results are in good agreement with both MC simulations and earlier measurements. Synchronization of the muon-veto system with the phonon and ionization signals of the Ge detector array allowed identification of muon-induced events. Rates for all muon-induced events $Γ^μ=(0.172 \pm 0.012)\, \rm{evts}/(\rm{kg \cdot d})$ and of WIMP-like events $Γ^{μ-n} = 0.008^{+0.005}_{-0.004}\, \rm{evts}/(\rm{kg \cdot d})$ were extracted. After vetoing, the remaining rate of accepted muon-induced neutrons in the EDELWEISS-II dark matter search was determined to be $Γ^{μ-n}_{\rm irred} < 6\cdot 10^{-4} \, \rm{evts}/(\rm{kg \cdot d})$ at 90%\,C.L. Based on these results, the muon-induced background expectation for an anticipated exposure of 3000\,\kgd\ for EDELWEISS-3 is $N^{μ-n}_{3000 kg\cdot d} < 0.6$ events.

astro-ph.CO↗