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NuDoubt++ searches for rare double weak decays involving positrons and electron capture. The experiment aims to study both Standard Model two-neutrino modes and beyond-the-Standard-Model neutrinoless modes, which could provide insight into the nature of neutrinos and lepton number conservation.

The experiment is based on a new detector concept combining hybrid slow and opaque scintillators with a dedicated light read-out technique. This approach is especially well suited to identifying positron signatures and suppressing backgrounds.