$e^{+}{e}^{-}$ pairs from a nuclear transition signaling an elusive light neutral boson

A. Krasznahorkay, F. W. N. de Boer, M. Csatlós +7

Electron-positron pairs have been observed in the 10.95-MeV $0^{-}\to 0^{+}$ decay in ${}^{16}$O. The branching ratio of the e${}^{+}$e${}^{-}$ pairs compared to the 3.84-MeV $0^{-}\to 2^{+}$ $\gamma$ deca…