DAVID PARKER / SCIENCE PHOTO LIBRARY DAVID PARKER / SCIENCE PHOTO LIBRARY
View from above of the huge UA1 particle detector at CERN, Geneva, seen in its circular pit. Woman on gantry gives scale. UA1 detects particles created in proton/antiproton collisions in the Super-Proton-Synchrotron (SPS) accelerator. Two of the outer muon "walls" (silvery) are seen on top of the detector. UA1 discovered the W and Z particles in 1983, & the top quark in 1984.
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