An empirical neutron scattering kernel for plexiglas

An empirical scattering kernel is proposed for thermal neutrons in plexiglas. The kernel is based on the Radkowsky prescription, but takes into account the chemical binding of hydrogen also in the energy transfer by an effective mass. The parameters are fitted to experimental results on the energy dependent total cross section of plexiglas and refined by fitting two parameters to neutron pulse measurements, using the P3L2 approximation. A reasonably good fit has been obtained.