Karlsruhe 2024 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 34: Neutrino physics 5

T 34.2: Vortrag

Dienstag, 5. März 2024, 16:15–16:30, Geb. 30.22: Gaede-HS

Measurement of the attenuation length and the group velocity of the JUNO liquid scintillators with the CELLPALS method — •Jessica Eck, Tanjina Anannya, Lukas Bieger, Marc Breisch, Tobias Heinz, Benedict Kaiser, Florian Kirsch, Tobias Lachenmaier, Dhanushka Bandara, and Tobias Sterr — Eberhard Karls Universität Tübingen, Physikalisches Institut

The Jiangmen Underground Neutrino Observatory (JUNO) is in the final stages of completion in southern China and data taking is scheduled to begin this year (2024). In the coming years, JUNO will investigate a broad field of neutrino physics. The main goal of JUNO is to determine the neutrino mass hierarchy, which requires a sufficiently good energy resolution in the detector. The JUNO detector consists of a large spherical vessel filled with 20ktons of highly transparent liquid scintillator based on the solvent linear alkyl-benzene (LAB) and the supplements PPO (fluor) and bis-MSB (wavelength shifter). The transparency of the scintillator is one of the most important factors in achieving a high energy resolution in the detector, thus it is important to quantify the attenuation length for the relevant wavelengths. Since conventional measurements of the attenuation length are affected by large uncertainties for very transparent liquids, the CELLPALS method was introduced, which provides significantly higher precision by using an optical resonator in combination with a modulated laser intensity. This talk will present results on the attenuation length and the group velocity of selected liquids including LAB samples after several stages of JUNOs liquid scintillator production chain.

Keywords: attenuation length; group velocity; liquid scintillator; large volume detector; laser interferometry