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T: Fachverband Teilchenphysik

T 53: Scintillator Detectors II

T 53.6: Talk

Wednesday, March 18, 2026, 17:30–17:45, KH 01.014

Development and Performance of a High-Pressure Scintillator Test Cell for NuDoubt⁺⁺ — •Magdalena Eisenhuth for the NuDoubt collaboration — JGU Mainz, Institute of Physics

The investigation of two-neutrino and neutrino-less double beta decay is crucial for understanding the Dirac or Majorana nature of neutrinos. In this context, the krypton isotope Kr-78 (Q=2.88 MeV) stands out as a promising candidate for a first detection of two-neutrino producing decays, electron-capture beta-plus decay (2nuECb+) and double-beta decay (2nubb+). Detectors like the NuDoubt⁺⁺ experiment featuring hybrid opaque scintillator can profit from solving krypton gas in the scintillator at high pressure to increase the number of target nuclei, thereby enhancing the probability of observing the extremely rare double beta decay modes. This presentation explores the ongoing development of a small-scale scintillator test cell for high-pressure loading, designed to examine the loading factor of krypton in scintillator as well as the influence on scintillator properties. We discuss the calibration required for a quantitative determination of the krypton concentration. Finally, we elaborate on the light yield and overpressure performances of the test cell and possible improvements.

Keywords: double beta decay; scintillator loading