The distributions considered here include these of general scattering angle, isotropic scattering angle in the laboratory system, isotropic scattering angle in the centre-of-mass system, and uniformly distributed scattering azimuthal angle. 在这里所考虑的分布包括有一般散射角分布,实验室系各向同性散射角分布,质心系各向同性散射角分布和均匀的散射方位角分布。