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Assembling CERN detector, 1969. Researcher making a lead glass spectrometer for use as a detector at CERN. CERN is the European particle physics laboratory near Geneva, Switzerland. It uses accelerators to form beams of high-energy particles and collide them with targets. The collisions create new particles that are detected by devices like this. This device was used to study the neutral decays of kaon particles, thus helping to refine the theories of the structure of matter. CERN was founded in 1954.
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