CERN / SCIENCE PHOTO LIBRARY CERN / SCIENCE PHOTO LIBRARY
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A view of the deep pit being built at CERN in 1980 to house the UA1 (Underground Area 1) particle detector at CERN, the European particle physics laboratory outside Geneva. The UA1 detector records collisions of protons & antiprotons in CERN's super-proton- synchrotron (SPS) accelerator. Its achievements include the discovery in 1983 of the two W particles & the Z particle`required by electroweak theory as the gauge bosons mediating the weak force; and the discovery in 1984 of the top quark.
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