Study of the proton weak decay of $_Λ^{12}C_{g.s.}$ with FINUDA

The FINUDA experiment studies the Λ-hypernuclei formation and decay using the reaction (K − stop, π − ) induced by the low-momentum K − from the deacy of the φ-meson produced at the (e+, e − ) collider DAφNE at the Laboratory Nazionali di Frascati of INFN. In this paper we present new data on the proton spectra following the weak decay of 12 Λ C