Gamma ray photon interacting with proton

Gamma ray photon interacting with proton

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Caption: Bubble chamber photo showing a gamma ray photon strongly interacting with a proton. Being neutral, the photon does not leave a track itself. It enters at the bottom of the picture & almost immediately interacts with a proton in the bubble chamber liquid. The collision produces (left to right) a proton, a negative pion, two positive pions & another negative pion. Positive particles curve anticlockwise, negative ones clockwise in the chamber's magnetic field. The small spirals are electrons knocked out of atoms by the other particles. This event is consistent with the prod- uction & decay of a resonance particle, the rho prime, which lives much too briefly to be visible.

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Keywords: bubble chamber photo, electron, gamma ray, image, particle physics, particles, photo, photon, pion, proton, resonance, rho prime particle, track, tracks

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