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First observation of omega-minus particle

First observation of omega-minus particle

A138/0047

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Credit

BROOKHAVEN NATIONAL LABORATORY / SCIENCE PHOTO LIBRARY BROOKHAVEN NATIONAL LABORATORY / SCIENCE PHOTO LIBRARY

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Editorial use only.

Caption

This historic photograph from the 80-inch (200cm) bubble chamber at the Brookhaven National Laborat- ory shows the first observation of the omega-minus particle, which consists of three strange quarks. A negative kaon enters at bottom left & collides with a proton in the chamber's hydrogen to produce 3 particles, including the omega-minus. The omega travels a short distance before decaying into a negative pion, which veers to the right across the bottom part of the picture, & a neutral xi partic- le which leaves no track. Discovery of the omega in 1964 confirmed Gell-Mann & Ne'eman's classific- ation of subatomic particles, the "Eightfold Way".

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