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T: Fachverband Teilchenphysik

T 104: Niederenergie-Neutrinophysik & Suche nach dunkler Materie 5

T 104.1: Gruppenbericht

Freitag, 13. März 2009, 14:00–14:20, A140

Recent Results from the BOREXINO Experiment — •Michael Wurm — for the BOREXINO Collaboration. Technische Universität München, Physik Department, E15 Lehrstuhl für Astroteilchenphysik; James-Franck-Str., 85748 Garching

The BOREXINO experiment aims at the detection of low-energetic solar neutrinos. 300 tons of organic liquid scintillator serve as target for neutrino-electron recoils that can be detected down to a threshold of several 100 keV. The necessary ultra-low background conditions have been achieved by multilayer shielding, use of radiopure materials, and purification of the target liquid. Data acquistion started in May 2007.

In this contribution, the most recent analysis of Berillium-7 neutrino events in BOREXINO is presented [PRL101:091302, 2008]. The first real-time measurement of Boron-8 neutrinos down to a threshold of 2.8 MeV is discussed. The comparison of the results of both measurements with the predictions of the Standard Solar Model confirms the MSW-LMA oscillation scenario at 1.8 sigma level [arXiv:0808.2868].

This work is partially funded by the Maier-Leibnitz-Laboratorium (Munich) and by the Excellenzcluster "Universe".