Karlsruhe 2011 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 87: Gammaastronomie I
T 87.3: Vortrag
Montag, 28. März 2011, 17:20–17:35, 30.41: 104
Measurement of neutron fluxes in the underground laboratory LSM — •Valentin Kozlov — Karlsruher Institut für Technologie, Institut für Kernphysik, Postfach 3640, 76021 Karlsruhe
Edelweiss-2 is a direct Dark Matter search experiment installed in the underground laboratory, Laboratoire Souterrain de Modane (LSM, France), and looking for weakly interacting massive particles (WIMP). The expected interaction rate of WIMPs is below 0.01 events/(kg day), thus rising the importance of having a detailed understanding of potential background. As the current analysis for Dark Matter search shows, ambient and muon-induced neutrons constitute a prominent background component. Detailed studies carried out by the Edelweiss collaboration in this respect are presented. These activities include dedicated calibrations with neutron sources, monitoring the neutron flux with 3He detectors and measurements with a neutron counter based on Gd-loaded liquid scintillator as well as corresponding MC simulations with full event topology. Studies of muon-induced neutrons are of particular interest. The impact of the neutron background on current Edelweiss-2 data-taking as well as for next generation experiments such as EURECA will be discussed.
This work is in part supported by the German Research Foundation (DFG) through the Transregional Collaborative Research Center SFB-TR27 as well as by the EU contract RII3-CT-2004-506222 and the Russian Foundation for Basic Research (grant No. 07-02-00355-a).