High accuracy average prompt fission neutron multiplicity description in the improved Los Alamos model

The Los Alamos model, with multiple chance fission, was upgraded to include the dependence of the total average fission-fragment kinetic energy and of the total average prompt gamma-ray energy on neutron incident energy. Using this model the prompt fission neutron spectrum, prompt fission neutron multiplicity, average energy of the spectrum and equivalent Maxwellian spectrum for the n+235U reaction can be calculated. The evaluation of the prompt fission neutron multiplicity is in very good agreement with the experimental data providing a better predictive power of the improved Los Alamos Model.