  Journal of Combinatorial Theory, Series B, 98(1):173-225, 2008n exotic nuclei
are studied in the framework of a fully self-consistent relativistic continuum
random phase approximation (RCRPA). In this method the contribution of the
continuum spectrum to nuclear excitations is treated exactly by the single
particle Green's function. Different from the cases in stable nuclei, there are
strong low-energy excitations in neutron-rich nuclei and proton-rich nuclei.
The neutron or proton excess pushes the centroid of the strength function to
lower energies and increases the fragmentation of the strength distribution.
The effect of treating the contribution of continuum exactly are also
discussed.
