Particle physics. View of the Mirabelle hydrogen bubble chamber at the Institute of High Energy Physics, Protvino, near Moscow. The bubble chamber uses liquid hydrogen kept just below its boiling point. A piston suddenly decreases the pressure in the liquid which becomes superheated. As charged particles pass through the chamber, they leave tiny trails of hydrogen bubbles behind. These are recorded by a special camera. These detectors have been superceded by electronic detectors. Photographed in 1971.
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