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A view of the central detector (red & yellow cylinder) which forms the core of the UA1 particle detector at CERN, the European particle physics laboratory outside Geneva. Named after its location at Underground Area 1, UA1 is a giant device consisting of many sub-detectors nestled within each other. It 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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