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The results of a measurement of the proton spectra following the Non--MesonicWeak Decay of $\mathrm{^5_{\Lambda}He}$, $\mathrm{^7_{\Lambda}Li}$ and$\mathrm{^{12}_{\Lambda}C}$ are presented and discussed. The experiment wasperformed at the ($e^+$ $e^-$) collider DA$\Phi$NE at Laboratori Nazionale diFrascati of INFN. It is the first measurement for $\mathrm{^7_{\Lambda}Li}$,and for all the spectra the lower limit on the energy of the protons is 15 MeV,never reached before. All the spectra show a similar shape, namely a peak ataround 80 MeV as expected for the free $\Lambda p \to np$ weak reaction, with alow energy rise that should be due to Final State Interactions and/ortwo--nucleon induced weak processes. The decay spectrum of$\mathrm{^5_{\Lambda}He}$ is somehow similar to the ones reported by previousmeasurements and theoretical calculations, but the same doesn't happen for the$\mathrm{^{12}_{\Lambda}C}$ one.

Measurement of the proton spectra from Non-Mesonic Weak Decay of $^5_{\Lambda}He$, $^7_{\Lambda}Li$ and $^{12}_{\Lambda}C$