Observation of the X17 anomaly in the decay of the Giant Dipole Resonance of ${}^8$Be

A. J. Krasznahorkay, A. Krasznahorkay, M. Csatlós +6

Angular correlation spectra of $e^{+}{e}^{-}$ pairs produced in the ${}^7$Li($p$,$\gamma$)${}^8$Be nuclear reaction were studied at a proton beam energy of $E_p$~=~4.0~MeV, which corresponds…