Bubble Chamber Photograph

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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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