Heidelberg 2007 – scientific programme

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T: Fachverband Teilchenphysik

T 601: Niederenergetische Neutrinos III

T 601.3: Talk

Friday, March 9, 2007, 17:20–17:35, INF 308 Gr. HS

Search for the diffuse supernova neutrino background in LENA — •Michael Wurm, Franz von Feilitzsch, Marianne Göger-Neff, Teresa Marrodán Undagoitia, Lothar Oberauer, Walter Potzel, and Jürgen Winter — Physikdepartment E15, Technische Universität München, James-Franck-Str., 85748 Garching

The next-generation neutrino observatory LENA (Low Energy Neutrino Astronomy) is intended to be a $\sim$50 kton liquid-scintillator detector. Due to the large mass, the low energy threshold and the high-grade background discrimination, LENA will be sensitive to the low isotropic flux of diffuse supernova neutrinos (DSN) that has been generated by core-collapse supernovae (SN) throughout the universe.

According to current DSN model predictions, we expect $\sim$10 $\bar\nu_e$ signal events per year in LENA. These will be observed inside an energy window limited by the backgrounds due to reactor and atmosperic $\bar\nu_e$'s. Apart from a first detection of the DSN, we will show that 10 years statistics in LENA will be sufficient to provide information on both SN core-collapse models and the cosmological SN rate (z<2).

This work has been supported by the DFG in the Transregio 27 "Neutrinos and Beyond", by the Excellence Cluster "Origin and Structure of the Universe", and by the Maier-Leibnitz-Laboratorium (Garching).