Speaker
Description
Double beta plus decay modes (𝛽+𝛽+, 𝛽+𝐸𝐶, and 2𝐸𝐶) are rare second-order weak processes converting two protons into two neutrons. Their observation is difficult due to extremely low probabilities, complex signatures, and the low natural abundance of suitable isotopes.
Studying these decays offers insights into nuclear structure and fundamental symmetries. Decay rates depend on nuclear matrix elements (NMEs) and phase space factors (PSFs), crucial for interpreting data and refining theoretical models.
We introduce NuDoubt++, a novel detector concept for double beta plus decay searches with unprecedented sensitivity. It integrates hybrid and opaque scintillation technologies with advanced light readout to enhance positron detection.
Preliminary sensitivity estimates indicate that a 1-tonne-week exposure could probe the parameter space relevant for 2𝜈𝛽+𝛽+ and 2𝜈𝛽+𝐸𝐶 decays in the candidate isotope ⁷⁸Kr, while offering the potential to explore 0𝜈𝛽+𝛽+ decay with sensitivities well beyond current experimental limits.