Compact extended model for Doppler broadening of neutron absorption resonances

We present a simplified compact model for calculating Doppler broadening of neutron absorption resonances in an incoherent Debye solid. Our model extends the effective temperature gas model to cover the whole range of energies and temperatures, and reduces the information of the dynamical system to a minimum content compatible with a much better accuracy of the calculation. This model is thus capable of replacing the existing algorithm in standard codes for resonance cross-sections preparation aimed at neutron and reactor physics calculations. The model is applied to the 238U 6.671 eV effective broadened cross-section. We also show how this model can be used for thermometry in an improved fashion compared to the effective temperature gas model.