  We have determined the spectra of neutrons and protons following the decay of
$\Lambda$ hypernuclei through the one- and two-nucleon induced mechanisms. The
momentum distributions of the primary nucleons are calculated and a Monte Carlo
simulation is used to account for final state interactions. From the spectra we
calculate the number of neutrons ($N_n$) and protons ($N_p$) per $\Lambda$
decay and show how the measurement of these quantities, particularly $N_p$, can
lead to a determination of $\Gamma_n / \Gamma_p$, the ratio of neutron to
proton induced $\Lambda$ decay. We also show that the consideration of the
two-nucleon induced channel has a repercussion in the results, widening the
band of allowed values of $\Gamma_n / \Gamma_p$ with respect to what is
obtained neglecting this channel.
