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From a sample of 98 hyperon production events observed in a liquid hydrogen bubble chamber the partial cross sections for various final states are found to be: 2 + iT%-0.047,i:^7r 0 -0.011, (A°2°)i^7r + -0.014, (AW)K + mr + -0.002, all in millibarns. For the first four processes the values are in general agreement with those calculated by Ferrari using a one-pion-exchange model. Only one example of impair production was observed, indicating a cross section less than 0.01 mb.

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