BASE Penning Trap System (IMAGE) Johannes Gutenberg Universitaet Mainz Caption BASE-Penningfallensystem zur Messung des magnetischen Moments des Antiprotons Credit Foto/©: Stefan Sellner, Fundamental Symmetries Laboratory, RIKEN, Japan Usage Restrictions This image may only be used in connection with the press release 'Riddle of matter remains unsolved: Proton and antiproton share fundamental properties', issued by Johannes Gutenberg University Mainz on Oct. 18, 2017. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.