Pulsformdiskrimination und Lichtausbeutemessungen von LAB-basierten Flüssigszintillatoren


Pulsformdiskrimination und Lichtausbeutemessungen von LAB-basierten Flüssigszintillatoren

Kögler, T.

Linear alkyl benzene (LAB, C6H5CnH2n+1, n = 10 - 13) is the proposed solvent for the SNO+, the Daya Bay Neutrino and LENA experiment. In solution with the commonly used scintillator PPO it is a colourless, odourless and cheap liquid scintillator with a high flash point and low health hazard compared to toluene based ones. The properties of LAB make this scintillator interesting also 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 quasi-monoenergetic photon sources and a Compton-spectrometer is described. The latter allows the measurement of the light yield down to 5 keVee (electron equivalent). The Birks-Parameter was determined for a homemade solution (LAB + 3 g=l PPO) and for NE-213. The light yield (relative to this standard scintillator) was confirmed by measurements using a fluorescence spectrometer. The ability of pulse-shape-discrimination in a mixed n-gamma-field of a 252Cf source was tested using different digital and semi-analogue techniques.

Keywords: liquid scintillators; digital signal processing; digital pulse shape discrimination; Compton spectrometer

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Publ.-Id: 16893