This is becoming a tradition: at the end of the year, the Large Hadron Collider (LHC) replaces the protons in the accelerator with lead nuclei. These are lead atoms stripped of their electrons, with “only” the 208 nucleons (that is protons or neutrons, the particles found inside the nucleus) left in the nucleus. So instead … Continue reading Partonic matter and perfect fluidity: it’s heavy ions time!