Experimental Hall (IMAGE) Johannes Gutenberg Universitaet Mainz Caption View of the experimental hall at the MAMI accelerator: The mass of a strange atomic nucleus was measured with the help of the magnetic spectrometer that can be seen in the photo. Credit Courtesy of Institute of Nuclear Physics, JGU Usage Restrictions This image may only be used in connection with the press release 'New measurement of the mass of a strange atomic nucleus achieves very high precision', issued by Johannes Gutenberg University Mainz on June 16, 2015. 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.