Statistical evolution of fragment isospin in nuclear multifragmentation

Two instructive effects concerning fragment production at disintegration of finite nuclei are predicted with the statistical multifragmentation model: (1) a concentration of neutrons in intermediate mass fragments during the phase transition, (2) the break of the spatial symmetry of the fragment's isospin distribution, as well as of the symmetry of the fragment's emission from a statistical source, induced by the external Coulomb field.