Direct experimental evidence of the weak $\Lambda n p \rightarrow n n p$   hypernucleus decay
  A direct experimental evidence of the occurrence of the weak reaction $\Lambda np\rightarrow nnp$ in nuclei has been obtained by the FINUDA experiment. Three events have been found that can be attributed to $^{7}_{\Lambda}$Li and $^{9}_{\Lambda}$Be two nucleon-induced non mesonic weak decays. The kinematic analysis of such events is presented here. 
M.Agnello, L.Benussi, M.Bertani, H.C.Bhang, G.Bonomi, E.Botta,   M.Bregant, T.Bressani, S.Bufalino, L.Busso, D.Calvo, P.Came...
hep-ex