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Direct experimental evidence of the weak $Λn p \rightarrow n n p$ hypernucleus decay

A direct experimental evidence of the occurrence of the weak reaction $Λnp\rightarrow nnp$ in nuclei has been obtained by the FINUDA experiment. Three events have been found that can be attributed to $^{7}_Λ$Li and $^{9}_Λ$Be two nucleon-induced non mesonic weak decays. The kinematic analysis of such events is presented here.