On the ΔI= 1/2 rule in the ΛN→NN reaction
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It is shown that the mass dependence of the Λ-lifetime in heavy hypernuclei is sensitive to the ratio of neutron-induced to proton-induced non-mesonic decay rates Rn/Rp. A comparison of the experimental mass dependence of the lifetimes with the calculated ones for different values of Rn/Rp leads to the conclusion that this ratio is larger than 2 on the confidence level of 0.75. This suggests that the phenomenological ΔI= 1/2 rule might be violated for the nonmesonic decay of the Λ-hyperon.
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