Speaker
Description
Positron-emitting double beta decay modes are rare nuclear processes. Their detection is challenging due to extremely low decay probabilities, complex experimental signatures, and the low natural abundance of suitable isotopes. Studying these decays can offer valuable insights into nuclear structure and fundamental symmetries. The decay rate is influenced by nuclear matrix elements (NMEs) and phase space factors (PSFs) - both essential for interpreting results and refining theoretical models. In this presentation, we introduce NuDoubt++, a new detector concept designed to search for double beta plus decays with unprecedented sensitivity. It combines hybrid and opaque scintillation technologies for the first time, along with advanced light readout techniques, to enhance detection of positron-based signatures. With this approach, we expect to observe two-neutrino double beta plus decay (2νβ⁺β⁺) within a 1-tonne-week exposure. Beyond that, NuDoubt++ will significantly improve sensitivity to neutrinoless double beta plus decay (0νβ⁺β⁺), pushing the current experimental limits by several orders of magnitude.
