Speaker
Description
SuperNEMO is searching for the hypothesised lepton-number-violating process, neutrinoless double-beta decay (0νββ). Extending NEMO-3’s world-leading design, our isotope-agnostic tracker-calorimeter architecture has the unique ability to track trajectories and energies of individual particles. This is a vital background-rejection tool, and enables detailed studies of the Standard Model double-beta decay process (2νββ) that produces two electrons, invisible neutrinos and, for some nuclear transitions, photons. By studying the electrons’ and photons’ energies and the angles between their trajectories at the emission point, SuperNEMO will be able to investigate nuclear processes indistinguishable to other technologies. For example, we can study decays to excited nuclear states, and provide constraints on the axial coupling constant, g_A. Precise measurement of the observables of 2νββ decays allows searches for beyond-the-Standard-Model effects like exotic 0νββ modes, Lorentz-violating decays and bosonic neutrino processes.
The SuperNEMO Demonstrator at LSM, France has been taking double-beta-decay data from a 6.11 kg Se-82 double-beta source since April 2025. We will present results of initial physics investigations, and demonstrate the performance and potential of the detector, and the programme outlook.