Published on June 21, 2019June 21, 2019 by Lokesh Positronium annihilation signal from the gamma-ray detectors #physics #antimatter #spectroscopy #UCL pic.twitter.com/mZEg5J6FiT — PsSpectroscopyUCL (@UclPs) June 21, 2019 Follow @UclPs Share this:TwitterFacebookLike this:Like Loading... Related