We study the effects of final state interactions in the non-mesonic weak decay $Lambda N rightarrow nN$ (n is a neutron and N is either a neutron or a proton) of the hypernucleus $_Lambda^4$He. Using a three-body model the effects of distortion of the interaction of the emitted nucleon pair with the residual nucleus is considered. We also study the influence of the final state interaction between the emitted nucleons using the Migdal-Watson model. The effect of spin symmetries in the final state of the pair is also considered. Based on our calculations, we conclude that final state interactions play a minor role in the kinetic energy spectrum of the emitted nucleon pair.
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