Mirabelle hydrogen bubble chamber image

Mirabelle hydrogen bubble chamber image

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Credit: SPUTNIK/SCIENCE PHOTO LIBRARY

Caption: Particle physics. Particle tracks photographed inside the Mirabelle hydrogen bubble chamber at the Institute of High Energy Physics, Protvino, near Moscow. The long straight lines are protons from a synchrotron accelerator. The curved lines are various charged particles created when a proton hits another in the chamber. Most of these are electrons, positrons and pions. 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 These detectors have been superceded by electronic detectors. Photographed in 1971.

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