CERN / SCIENCE PHOTO LIBRARY CERN / SCIENCE PHOTO LIBRARY
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Aerial photograph of the site of CERN, the European Centre for Nuclear Research, showing the outline of the underground Super-Proton- Synchrotron (SPS) accelerator (white dotted line). Geneva & the French Alps are beyond. As well as being employed as an ordinary accelerator, the SPS has also been used since 1983 as a collider, accelerating protons in one direction & antiprotons in the opposite direction within the same circular beam pipe. The resulting proton/antiproton collisions led to the discovery in 1983 & 1984 of the W & Z particles, mediators of the weak nuclear force.
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