“…A general analytical expression for the integral (2) cannot be obtained. Various studies of the integral have yielded a number of series expansions (having different accuracies and different radii of convergence) and, in the case of repulsive interactions, approximate analytical formulae for the angle g in small-angle scatterings (Kihara 1953, Mott-Smith 1960, Lehmann and Leibfried 1963, Leibfried and Plesser 1965, Smith et al 1966, Gislason 1972, Pauly 1979, Kunc 1993.…”