  If sufficiently light dibaryon resonances exist, a Bose condensate of
dibaryons can occur in nuclear matter before the quark-hadron phase transition.
Within a relativistic mean-field model we show that heterophase
nuclear-dibaryon matter is for a wide set of parameters energetically more
favorable than normal nuclear matter. Production of dibaryons is, however,
relatively suppressed as compared to estimates based on the model of
non-interacting nucleons and dibaryons.
