Erlangen 2026 – scientific programme

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T: Fachverband Teilchenphysik

T 22: Neutrino Physics II

T 22.1: Talk

Tuesday, March 17, 2026, 16:15–16:30, AudiMax

Particle Identification in the Hybrid Opaque Scintillator Experiment NuDoubt++ — •Kyra Mossel for the NuDoubt collaboration — Johannes Gutenberg-Universität Mainz

Neutrinoless double beta decay is a hypothetical lepton-number-violating process whose observation would establish the Majorana nature of the neutrino. Detecting this extremely rare decay demands exceptionally low background levels and highly effective particle identification techniques.

The NuDoubt++ experiment investigates double beta plus decay modes using a novel hybrid opaque scintillator instrumented with a dense grid of optical fibers coupled to SiPMs. This detector concept enables the reconstruction of energy-deposit topology while simultaneously exploiting the ratio of Cerenkov to scintillation light to enhance background rejection and particle identification.

In this presentation, event reconstruction and particle identification methods developed for NuDoubt++ are presented. Performance studies based on Monte-Carlo simulations are shown, demonstrating the potential of this approach for rare event searches.

Keywords: Double Beta Decay; Particle identification; Scintillator; Opaque; Hybrid