Discovery of neutral xi (or cascade) particle

Discovery of neutral xi (or cascade) particle

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Credit: LAWRENCE BERKELEY LABORATORY/SCIENCE PHOTO LIBRARY

Caption: 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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Keywords: bubble chamber photo, cascade particles, image, lawrence berkeley laboratory, odyssey, particle physics, photo, pion, xi particle, xi-zero discovery photo

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