Collisions (IMAGE) Iowa State University Caption In December the ATLAS experiment at the Large Hadron Collider began recording proton-proton collisions at a record energy of 2.36 trillion electron volts. Credit Image courtesy of the ATLAS Experiment at CERN. Usage Restrictions None 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.