Münster 2011 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 13: Instrumentierung II
HK 13.9: Vortrag
Montag, 21. März 2011, 18:45–19:00, HS1
Determination of light yield and pulse-shape-discrimination abilities of LAB-based liquid scintillators — •Toni Kögler1,2, Kai Zuber1, Arnd Junghans2, Georg Schramm1,2, Roland Beyer2, Roland Hannaske2, Andreas Hartmann2, and Andreas Wagner2 — 1Technische Universität Dresden, 01062 Dresden, Germany — 2Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
Linear alkyl benzene (LAB, C6H5CnH2n+1 ,n=10−13) is the proposed solvent for the SNO+ experiment. In solution with the commonly used scintillator PPO it is a colourless, odourless and cheap liquid scintillator with a high flashpoint and low health hazard compared to toluene based ones. LAB does not react with the acrylic vessel of the SNO experiment and makes it an ideal solvent. The properties of LAB also makes this scintillator interesting for nELBE, the neutron time-of-flight facility at Helmholtz-Zentrum Dresden-Rossendorf. A new approach to measure the light yield in the low energy range using a combination of “monoenergetic” photon sources and a Compton-spectrometer is described. The latter one allows measuring the light yield down to 5 keVee (electron equivalent). The Birks-Parameter was determined for a homemade solution (LAB + 3g/l PPO) and for NE-213. The light yield (relative to this standard scintillator) was confirmed by fluorescence measurement using a fluorescence spectrometer. The ability of pulse-shape-discrimination in a mixed neutron-gamma field of a 252Cf source was tested using different digital and analogue techniques.