Bonn 2020 – scientific programme

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T: Fachverband Teilchenphysik

T 101: Neutrino physics without accelerators VII

T 101.4: Talk

Friday, April 3, 2020, 11:45–12:00, H-ÜR 1

Measurement of the attenuation length and the group velocity of liquid scintillators with the CELLPALS technique — David Blum, Marc Breisch, •Jessica Eck, Tobias Heinz, Tobias Lachenmaier, Neha Lad, Axel Müller, Tobias Sterr, and Alexander Tietzsch — Physikalisches Institut Eberhard Karls Universität Tübingen

To quantify the transparency of liquid scintillators for next-generation neutrino experiments (e.g. JUNO), a measurement of the attenuation length is crucial to ensure that a sufficient number of scintillation photons reach the surrounding photomultipliers. However, this becomes difficult for attenuation lengths of several tens of meters due to the necessity of a sufficient long light path through the sample.

This talk will present the CELLPALS technique to measure the attenuation length of liquid scintillators using an optical cavity to extend the effective light path. In addition, the CELLPALS method also provides the determination of the group velocity of the sample. The experimental setup and the results for different samples will be presented. This work is supported by the Deutsche Forschungsgemeinschaft.