Simple functional forms for total cross sections from neutron-nucleus   collisions
  Neutron scattering total cross sections have been estimated from nuclei ranging in mass 6 to 238 and for neutron energies 10 MeV to 600 MeV using a simple function of three parameters. These total cross sections have also been calculated using coordinate space optical potentials formed by full folding effective two-nucleon (NN) interactions with one body density matrix elements (OBDME) of the nuclear ground states. Adjusting the theoretically defined parameter values has enabled us to fit the actual measured data. The simple functional parameter values vary smoothly with mass and energy. 
P. K. Deb (The Ohio State University) and K. Amos (The University of   Melbourne)