Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 58: Neutrino physics 8

T 58.8: Talk

Wednesday, March 6, 2024, 17:45–18:00, Geb. 30.22: Gaede-HS

Precision Attenuation Length Measurement of Liquid Scintillators for Future Large Volume Neutrinos Experiments — •Vincent Rompel, Korbinian Stangler, Florian Kübelbäck, Hans Steiger, and Lothar Oberauer — Technische Universität München, Physik-Department, James-Franck-Straße 1

Upcoming large volume neutrino experiments (like JUNO or THEIA) place high demands on the purity of their scintillators. The optical properties are important to ensure that a large number of photons reach the light detectors. Therefore, scintillators require attenuation lengths >20m for the wavelengths of interest. Measurements of these optical properties have so far been carried out with UV/Vis spectrometers and cuvette lengths of 10cm which leads to overall uncertainties of the same order of magnitude as the attenuation length. In order to obtain precise measurements, the Precision Attenuation Length Measurement (PALM) was developed with light path lengths of up to 2.8m. The setup aims to determine the attenuation length for a wavelength range between 350 and 1000nm with an uncertainty of less than ten percent. So far, initial calibration and test measurements have been performed on linear alkylbenzene (LAB) to ensure and optimize the performance of the setup.

This work is supported by the Cluster of Excellence ORIGINS, the Collaborative Research Center 1258, and the DFG Research Units 2319 and 5519.