Freezing of the hard core Yukawa fluid

We have studied the freezing of hard spheres with a Yukawa attractive or repulsive potential in the mean spherical approximation by using the density functional theory proposed by Ramakrishnan and Yussouff and extended later by Haymet and Oxtoby. We have calculated the densities of the liquid and solid phases at the phase transition as a function of temperature for two different parameters of the range of Yukawa potential (z=1 and z=5).