Göttingen 2025 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 17: Neutrino Physics II

T 17.6: Vortrag

Montag, 31. März 2025, 18:00–18:15, VG 3.104

First Water-based Liquid Scintillator (WbLS) measurement with DISCO — •Noah Goehlke¹, Amala Augusthy¹, Manuel Böhles¹, Daniele Guffanti³, Benedict Kaiser⁴, Tobias Lachenmaier⁴, Hans Steiger², and Michael Wurm¹ — ¹Johannes Gutenberg-Universität Mainz — ²Technical University of Munich — ³University of Milano-Bicocca — ⁴Eberhard Karls Universität Tübingen

Water based liquid scintillator (WbLS) is a novel detection medium, consisting of liquid scintillator dissolved in water with the help of a surfactant. It allows for the simultaneous measurement of Cherenkov and scintillation light. This hybrid event topology can be used for event reconstruction including sub-Cherenkov particles but also enhanced background rejection, for example for measuring the DSNB. Thus, WbLS is being considered as detection medium for future neutrino detectors like Theia. DISCO is a lab-scale experiment, designed to investigate the Cherenkov-scintillation separation and to characterize WbLS, using cosmic muons. The detector has a cylindrical 15 l test-cell which can be filled with water, WbLS or liquid scintillator. The light is detected by 16 fast 1'' PMTs with the option to install in addition an LAPPD (Large Area Picosecond PhotoDetector). The fast photon detectors allow DISCO to investigate a time-based separation of the fast Cherenkov and slower scintillation light. Above the test-cell is a muon tracker, used as a trigger and to reconstruct the muon tracks. This talk presents results of the first WbLS run with DISCO. This work is supported by the Research Training Group "Particle Detectors".

Keywords: Water-based liquid scintillator; hybrid detection; LAPPD; Cherenkov; Scintillation