  The A-dependence is observed in $x_F$-distributions for the $\Lambda K^0$
system produced with the small transverse momentum in the neutron-nucleus
interactions. For the $\Lambda$ hyperons similar dependence isn't seen. The
result is interpreted as an effect from intermediate excitative nucleon state,
which decays into strange particles. Such interpretation is confirmed
experimental data on $\Lambda K$ pair production in the pion-nucleon
interactions.
