LAWRENCE BERKELEY LABORATORY / SCIENCE PHOTO LIBRARY LAWRENCE BERKELEY LABORATORY / SCIENCE PHOTO LIBRARY
Annihilation in a bubble chamber. False-colour image from a hydrogen bubble chamber showing the annihilation of an antiproton (horizontal line entering at left) and a proton. The annihilation event has occurred at the intersection point just right of centre. Only charged particles leave tracks in such chambers; the passage of neutral particles has to be inferred from these data. Spiral tracks are due to low-energy electrons and positrons. In modern, extremely high- energy particle experiments, the bubble chamber has been supplanted by electronic detectors.
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