Smashing Heavy Nuclei Reveals Proton Size (IMAGE) DOE/US Department of Energy Caption A model assuming smaller protons & neutrons & a “lumpier” arrangement of these building blocks (left) fits experimental data on the initial energy density in heavy ion collisions better than a model w/ larger protons, neutrons & smoother structure (right) Credit Image courtesy of Brookhaven National Laboratory Usage Restrictions Image courtesy of Brookhaven National Laboratory License Original 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.