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LENA

LENA. LENA Delta. Low Energy Neutrino Astrophysics. L. Oberauer, F. von Feilitzsch, C. Grieb, K. Hochmuth, C. Lendvai, T. Marrodan, L. Niedermeier, W. Potzel, M. Wurm Technische Universität München www.e15.physik.tu-muenchen.de/research/lena.htlm. PXE as scintillating solvent.

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LENA

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  1. LENA LENA Delta Low Energy Neutrino Astrophysics L. Oberauer, F. von Feilitzsch, C. Grieb, K. Hochmuth, C. Lendvai, T. Marrodan, L. Niedermeier, W. Potzel, M. Wurm Technische Universität München www.e15.physik.tu-muenchen.de/research/lena.htlm

  2. PXE as scintillating solvent • PXE tests @ Counting Test Facility from BOREXINO at Gran Sasso (physics/0408032) • 372 pe / MeV @ 20% coverage lattenuation ~ 4 m @ 430 nm • lattenuation ~ 12 m after purification • (alumina-column, S. Schönert MPIK Hd for LENS) • => ~ 120 pe / MeV in LENA (central events) => low energy threshold (sub-MeV) => good resolution in energy and position reconstruction CTF

  3. Program for investigations of PXE / dodecane mixtures • C, Buck et al., MPIK Heidelberg • (Double-Chooz) • M. Wurm, K. Hochmuth, TUM • improve compability with detector materials • improve further transparency? • increase free H number (by ~30%) ~90% light yield with 40% PXE and 60% dodecane M. Wurm

  4. Geo - neutrinos and LENA • what is the source of the terrestrial heat flow ? • what is the contribution of natural radioactivity ? • how much of U, Th is in the mantle ? • is there a natural reactor at the Earth‘s center?

  5. Angular distribution information • reconstruct vertices of prompt and delayed events • resolution ~ 30o (MonteCarlo) maximum model Core enhanced minimal model K. Hochmuth Q (rad) Events per year

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