Eventi - 17 Settembre 2025 › Seminari generali

Speaker: Gianluca Cavoto (Istituto Nazionale di Fisica Nucleare) The observation of a resonance structure in the opening angle of the electron-positron pairs in the 7Li(p,e+e−)8Be reaction was claimed and interpreted as the production and subsequent decay of a hypothetical particle (X17). Similar excesses, consistent with this particle, were later observed in processes involving 4He and …