2013/02/01 by The EDELWEISS collaboration, B. Schmidt, E. Armengaud +66 · 2 citations
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #Neutrino Physics Research #Particle physics theoretical and experimental studies #astro-ph.CO #astro-ph.IM #physics.ins-det
paper · pdf · doi:10.1016/j.astropartphys.2013.01.014
published as Astroparticle Physics 44 (2013) 28-39 · 21 pages, 16 figures, Accepted for publication in Astropart. Phys
openalex publication_date 2013/02/01 · arxiv created 2013/02/28 · arxiv updated 2013/03/05 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/02
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 Φμ=(5.4± 0.2 +0.5-0.9) muons/m2/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 Γμ=(0.172 ± 0.012) \rmevts/(\rmkg ⋅ d) and of WIMP-like events Γμ-n = 0.008+0.005-0.004 \rmevts/(\rmkg ⋅ d) were extracted. After vetoing, the remaining rate of accepted muon-induced neutrons in the EDELWEISS-II dark matter search was determined to be Γμ-n\rm irred < 6⋅ 10-4 \rmevts/(\rmkg ⋅ 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 Nμ-n3000 kg⋅ d < 0.6 events.