![Electrons and positrons produced simultaneously from individual gamma rays curl in opposite …[Credits : Courtesy of the Lawrence Berkeley Laboratory]](http://media-2.web.britannica.com/eb-media/42/60142-004-E8014DC8.jpg)
Electrons and positrons produced simultaneously from individual gamma rays curl in opposite directions in the magnetic field of a bubble chamber. In the above example the gamma ray has lost some energy to an atomic electron, which leaves the long track, curling left. The gamma rays do not leave tracks in the chamber, as they have no electric charge.
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