  We point out that during the supernova II type explosion the thermodynamical
condition of stellar matter between the protoneutron star and the shock front
corresponds to the nuclear liquid-gas phase coexistence region, which can be
investigated in nuclear multifragmentation reactions. We have demonstrated,
that neutron-rich hot heavy nuclei can be produced in this region. The
production of these nuclei may influence dynamics of the explosion and
contribute to the synthesis of heavy elements.
