Proton tracks

Proton tracks

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Caption: Proton tracks in a bubble chamber. A proton (yellow) moves across the chamber diagonally from bottom right & scatters from other protons in the liquid hydrogen filling the bubble chamber. Each time the angle between the scattered particles is close to 90 degrees, revealing the equality of their masses. The tracks of particles not involved in this game of subatomic billiards, shown in muted grey in this colour-enhanced photograph, curve in the chamber's magnetic field; lightweight electrons knocked from hydrogen atoms in the liquid form characteristic spirals. Bubble chamber photograph from the Lawrence Berkeley Laboratory.

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Keywords: baryons, bubble chamber photograph, high-energy physics, image, lawrence berkeley laboratory, matter, particle physics, photo, proton scattering, protons, subatomic particles, the particle odyssey

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