Abstract
We calculate the ΛΛ→ YN transition rate of 6 ΛΛ He by the hybrid picture, the π and K exchanges plus the direct quark processes. It is found that the hyperon-induced decay is weaker than the nucleon-induced decay, but the former may reveal the short-range mechanism of the weak transition and also give a clear signal of the strong Δ I=3/2 transition. The ΛΛ→ YN transition in double- Λ hypernucleus is complement to the ΛN→ NN transition as it occurs only in the J=0 channel, while the J=1 transition is dominant in the ΛN→ NN case.
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