Caption: Photograph of dozens of subatomic particle tracks in a bubble chamber at the Lawrence Berkeley Laboratory, California. The particles streaming almost straight up the picture from bottom to top are negative kaons, produced from the Bevatron accelerator. Some of them interact with protons in the bubble chamber liquid to give rise to new particles. The paths of the particles are bent to various degrees by the bubble chamber's magnetic field: the more massive & energetic the particle, the less its path bends. The spiral tracks are produced by lightweight, low-energy electrons knocked out of atoms in the bubble chamber liquid.
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