C. POWELL, P. FOWLER & D. PERKINS / SCIENCE PHOTO LIBRARY C. POWELL, P. FOWLER & D. PERKINS / SCIENCE PHOTO LIBRARY
Emulsion photograph showing the collision of a proton, which enters from the bottom, with another proton in the emulsion. Because they have equal mass, the two protons move away from the collision point at an angle of 90 degrees to each other. The picture was taken in the 1930s by Cecil Powell, the English physicist who pioneered the use of photographic emulsions to record particle tracks. It is one of the pictures he took showing the collisions of particles artificially accelerated in early particle accelerators.
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