Karlsruhe 2024 – scientific programme
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T: Fachverband Teilchenphysik
T 87: Neutrino physics 11
T 87.8: Talk
Thursday, March 7, 2024, 17:45–18:00, Geb. 30.22: Gaede-HS
Measuring Cherenkov light in liquid scintillator neutrino detectors using Wavelength-Shifting Optical Modules — •Florian Rehbein1, Thomas Hebbeker1, Heiko Lacker2, and Michael Wurm3 — 1Physics Institute III A, RWTH Aachen University — 2Humboldt-Universität zu Berlin — 3Johannes Gutenberg-Universität Mainz
Wavelength-Shifting Optical Modules (WOMs) are photo sensors consisting of a PMMA tube coated with wavelength-shifting paint. The coating absorbs photons and re-emits wavelength-shifted photons, which are guided toward the ends of the tube and are then detected using an array of attached SiPMs. This simple design of a WOM presents a novel optical sensor for various applications, as the size of the module and the type of coating can be adjusted to the specific requirements of the detector. One future application of WOMs will be the Surrounding Background Tagger (SBT) of the proposed SHiP (Search for Hidden Particles) experiment at the CERN facility.
This contribution will present the first study of WOMs in liquid scintillator-based low-energy neutrino detectors. Instrumenting such a detector with two types of WOMs with different wavelength-shifting coatings provides spectral sensitivity for the incident photons. Since the two WOM types are sensitive to different wavelength ranges, one can discriminate long-wavelength Cherenkov from short-wavelength scintillation photons. This hybrid detection technique is especially advantageous to achieve both low-energy threshold (scintillation) and directional reconstruction (Cherenkov) for background reduction.
Keywords: low-energy neutrinos; hybrid optical detectors; photo sensors; liquid scintillator; WOMs