Antiproton Decelerator (IMAGE) Johannes Gutenberg Universitaet Mainz Caption This is an image of BASE experiment at the CERN antiproton decelerator in Geneva: Visible in the image are the control equipment, the superconducting magnet that houses the Penning trap, and the antiproton transfer beam tube. Credit 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.