Electron-positron pair: matter/antimatter

Electron-positron pair: matter/antimatter

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Caption: Production of matter & antimatter in two electron- positron pairs. In this bubble chamber photo, two invisible gamma-ray photons enter from the top & each produce a pair of electrons & positrons (or anti-electrons). In the upper pair, the incoming photon also displaces an atomic electron, which shoots off towards bottom left. In the lower pair, all the photon's energy goes into producing the electron & positron; being more energetic, they curve less in the bubble chamber's magnetic field than the top pair, whose spiral tracks are typical of low-energy electrons & positrons. The negative photo has had irrelevant tracks removed.

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Keywords: antimatter, black and white, black-and-white, bubble chamber photograph, electron-positron pair, electrons, high-energy physics, image, images, impact event force energy, lawrence berkeley laboratory, leptons, magnified image, matter, matter-antimatter, microscopic photos, monochrome image, motion action, move movement moving, particle physics, photo, positron, spirals, subatomic particles, subjects

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