Prompt neutron multiplicity distribution for 235U(n,f) at incident energies up to 20 MeV

Abstract

For the n+235U fission reaction, the total excitation energy partition of the fission fragments, the average neutron kinetic energy ⟨ε⟩(A) and the total average energies Ēγ(A) removed by γ rays as a function of fission fragment mass are given at incident energies up to 20 MeV. The prompt neutron multiplicity as a function of the fragment mass, ν(A), for neutron-induced fission of 235U at different incident neutron energies is calculated. The calculated results are checked with the total average prompt neutron multiplicities ν̄ and compared with the experimental and evaluated data. Some prompt neutron and γ emission mechanisms are discussed.