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The decay of $\Lambda$-hypernuclei without pion emission, known as NonMesonic Weak Decay (NMWD), gives an effective tool to investigate $\Delta$S=1four-baryon interactions. It was theoretically suggested that the two-nucleoninduced mechanism could play a substantial role in reproducing the observedNMWD decay rates and nucleon spectra, but at present no direct evidence of sucha mechanism has been obtained. The FINUDA experiment, exploiting thepossibility to detect both charged and neutral particles coming from thehypernucleus decay, has allowed us to deduce the relative weight of the twonucleon induced decay rate to the total NMWD rate. The value of$\Gamma_{2N}$/$\Gamma_{NMWD}$=0.24$\pm$${0.03_{stat}}^{+0.03_{sys}}_{{-{0.02_{sys}}}}$has been deduced, with an error reduced by a factor more than two compared withthe previous assessment.

An improved determination of the two--nucleon induced non mesonic weak decay of $\Lambda$-hypernuclei