Discovery Of Neutral Xi (or Cascade) Particle

by Science Photo Library

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Discovery Of Neutral Xi (or Cascade) Particle

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Science Photo Library

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Photograph - Photograph

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The neutral xi (or cascade) particle was discover- ed from this bubble chamber photograph, taken in the 15- inch (38 cm) bubble chamber at the Lawrence Berkeley Laboratory, California, in 1959. A negative kaon enters from bottom & interacts with a proton in the chamber to produce the xi-zero. Being neutral, the xi- zero leaves no track itself. It was particularly difficult to discover because it decays into two more neutral particles, the lambda & neutral pion, which are also unseen. (Diagram of the particle tracks & more information available if required).

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May 8th, 2022

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