Search for Positron-Emitting Double Weak Decays at the NuDoubt++ Experiment

Positive double weak decays are rare nuclear disintegration processes. Difficulties in their measurement arise from suppressed decay probabilities, experimentally challenging decay signatures and low natural abundances of suitable candidate nuclei. In this presentation, we propose NuDoubt⁺⁺, a new detector concept to overcome these challenges. It is based on the first-time combination of hybrid and opaque scintillation detector technology paired with novel light read-out techniques. This approach is particularly suitable detecting positron (beta plus) signatures. We expect to discover positron-emitting two-neutrino double weak decay modes within 1 tonne-week exposure and are able to probe positron-emitting neutrinoless double weak decays at several orders of magnitude improved significance compared to current experimental limits.