Darmstadt 2008 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 10: Kern- und Teilchen-Astrophysik

HK 10.3: Talk

Monday, March 10, 2008, 17:15–17:30, 2B

Liquid scintillator development for the proposed LENA detector — •Teresa Marrodan Undagoitia, Franz von Feilitzsch, Marianne GoEger-Neff, Lothar Oberauer, Walter Potzel, JuErgen Winter, and Michael Wurm — Physik-Deparment E15, Technische Universitaet Muenchen, James-Franck-str., 85748, Garching

The status of the feasibility studies for the proposed large liquid-scintillator detector LENA (Low Energy Neutrino Astronomy) is reported. First, the physics potential of the detector concerning astro- and particle-physics is briefly introduced. The main part of the talk deals with recent technical investigations of optical properties of possible scintillator mixtures. The solvents PXE, LAB and Dodecan as well as the wavelenghtshifters PPO, bisMSB, pTP and PMP has been tested. Measurements of relative light yield and fluorescence decay time are presented. In addition, emission spectra of different samples, with different concentrations of wavelenghtshifter are shown. The experimental results are interpreted with a microscopic modell taking into account radiative and non-radiative energy transfer between organic molecules.