Bubble Chamber Photograph
This is an actual bubble chamber photograph of an antiproton
(entering from the bottom of the picture)
colliding with a proton (at rest) and
annihilating.
Eight pions were produced in this annihilation.
One decayed into a
+ and a
.
The positive and negative pions curve different ways in the magnetic field.
The bubble chamber is a more advanced detector than the
cloud chamber, but much less powerful than modern detectors.
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decay path.