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The lifetime of the Lambda -hyperon for the nonmesonic decay LambdaN --> NN has been determined by a measurement at COSY Julich of the delayed fission of heavy hypernuclei produced in proton-Au collisions at T-p = 1.9 GeV. It is found that heavy hypernuclei with mass numbers A approximate to (180 +/- 5) and atomic numbers Z approximate to (74 +/- 2) fission with a lifetime tau (Lambda) = 130 +/- 13 (stat.) +/-15 (syst.) ps. This value together with the results obtained for other heavy hypernuclei in previous investigations indicates -on the confidence level of 0.9- a violation of the phenomenological DeltaI = 1/2 rule for the LambdaN --> NN transitions as known from the weak mesonic decays of kaons and hyperons

Nonmesonic decay of the Λ-hyperon in hypernuclei produced by p + Au collisions