Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 109: Neutrino physics 12

T 109.4: Talk

Friday, March 8, 2024, 09:45–10:00, Geb. 30.21: Gerthsen-HS

Particle Identification with the Cherenkov to Scintillation Ratio in an idealised Water-based Liquid Scintillator Detector — Daniel Bick, Caren Hagner, and •Malte Stender — Universität Hamburg, Institut für Experimentalphysik

The Diffuse Supernova Neutrino Background (DSNB) is of great interest for the star formation rate and understanding of supernovae. However, DSNB neutrinos were not detected yet due to the presence of strong backgrounds. For water Cherenkov detectors, a relevant background are muons below Cherenkov threshold. Mixing liquid scintillator into the water gives the opportunity to suppress invisible muons via the Cherenkov to scintillation ratio (C/S ratio). Such a Water-based Liquid Scintillator (WbLS) detector has also access to advantages like direction and enhanced energy reconstruction, if a light separation algorithm is in place. This algorithm uses the difference between Cherenkov and scintillation photons - the first is emitted instantenous in a cone, the latter isotropic and delayed - to sort the hits.
For this sorting the photodetector of choice has to be able to resolve the difference in time and space from the hits of both light types. The Large Area Picosecond Detector (LAPPD) is a novel photosensor reaching a spatial resolution of about 1 mm and a time resolution of ∼ 0.1 ns and is therefore well-suited to do exactly that.
At the example of a simulated and idealised WbLS detector completely covered with LAPPDs, a feasibility study is conducted.
This contribution presents the simulation and a light separation algorithm showing the suppression of invisible muons in a WbLS detector.

Keywords: water-based liquid scintillator; LAPPD; light separation; Cherenkov; scintillation