Critical opalescence in binary liquid metal mixtures. II. Concentration dependence

For pt. I, see abstr. A48149 of 1968. A study of the temperature dependence of critical opalescence in the Bi-Ga system has been made for solutions of five different concentrations, by means of the inelastic scattering of slow neutrons. At each concentration the spectra of neutrons scattered from the solution are separable into a Q-dependent quasi-elastic region and an inelastic region largely independent of Q. The former are associated with scattering from the concentration fluctuations and the latter with the high frequency cooperative modes of the system. The inelastic regions of the spectra are largely independent of temperature and the concentration of the solution, whereas the elastic regions are sensitive to both these parameters. The critical indices eta and delta are evaluated.