Freiburg 2008 – scientific programme

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T: Fachverband Teilchenphysik

T 88: Niederenergie-Neutrinophysik und Suche nach Dunkler Materie III

T 88.3: Talk

Wednesday, March 5, 2008, 17:20–17:35, KGI-HS 1098

Muon veto efficiency of the BOREXINO detector — •Timo Lewke for the BOREXINO collaboration — Physik-Department E15, Technische Universität München, James-Franck-Straße, 85748 Garching

Borexino is an organic liquid-scintillator detector for the measurement of the low-energy part of the solar neutrino spectrum. It consists of a 300 t PC (Pseudocumene) inner detector surrounded by approximately 1 kt of non-scintillating buffer liquid. As outer shilding, a water-filled tank is used. It also serves as a water Cherenkov muon veto. Starting measurements in May 2007, Borexino published the first real-time detection of ⁷Be neutrinos in August 2007.

In order to distinguish between neutrino events and cosmogenic background, muons have to be identified. Both outer and inner detector can be used to tag atmospheric muons. In this talk, different possibilities for muon identification in Borexino are explained. Moreover, the overall efficiency of the veto is presented.