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The FINUDA experiment performed a systematic study of the charged mesonicweak decay channel of $p$-shell $\Lambda$-hypernuclei. Negatively charged pionspectra from mesonic decay were measured with magnetic analysis for the firsttime for ${^{7}_{\Lambda}Li}$, ${^{9}_{\Lambda}Be}$, ${^{11}_{\Lambda}B}$ and${^{15}_{\Lambda}N}$. The shape of the $\pi^{-}$ spectra was interpretedthrough a comparison with pion distorted wave calculations that take intoaccount the structure of both hypernucleus and daughter nucleus. Branchingratios $\Gamma_{\pi^{-}}/\Gamma_{tot}$ were derived from the measured spectraand converted to $\pi^{-}$ decay rates $\Gamma_{\pi^{-}}$ by means of known orextrapolated total decay widths $\Gamma_{tot}$ of $p$-shell$\Lambda$-hypernuclei. Based on these measurements, the spin-parity assignment$1/2^+$ for ${^{7}_{\Lambda}Li}$ and $5/2^+$ for ${^{11}_{\Lambda}B}$ground-state are confirmed and a spin-parity $3/2^+$ for ${^{15}_{\Lambda}N}$ground-state is assigned for the first time.

New results on Mesonic Weak Decay of $p$-shell $\Lambda$-Hypernuclei