Abstract
The CGMF code provides a complete description of the properties of the prompt neutrons and γ rays, emitted before beta decays. It is based on a Monte Carlo implementation of the Hauser-Feshbach statistical model, which provides an accurate phenomenological description of the de-excitation of the fission fragments toward stable configurations via neutron and γ-ray emissions. This approach allows a detailed description of a large number of observables, such as multiplicity probabilities and correlations between the emitted particles. In this contribution, we briefly review the approach and present selected examples of neutron and γ-ray observables for neutron incident energies from thermal to 20 MeV, and compare against available data for 235 U(n,f) reaction.
Highlights
Nuclear reactors and other applications often require the knowledge of the energy released in neutron-induced fission reactions via the emission of prompt neutrons and γ rays
In this contribution we describe the implementation of the incident neutron energy into the CGMF (Cascading Gamma-ray and Multiplicity for Fission) code developed at Los Alamos for simulating prompt neutron and γ -ray observables
The fragments can be treated as compound nuclei, whose de-excitation toward stable configurations is modeled in the Hauser-Feshbach statistical decay model [1], that provides a detailed phenomenological description of the de-excitation process
Summary
Nuclear reactors and other applications often require the knowledge of the energy released in neutron-induced fission reactions via the emission of prompt neutrons and γ rays. Correlations between the prompt particles are of particular interest In this contribution we describe the implementation of the incident neutron energy into the CGMF (Cascading Gamma-ray and Multiplicity for Fission) code developed at Los Alamos for simulating prompt neutron and γ -ray observables. The yields Y (TKE| A; En) play an important role in the correct description of neutron observables, as they determine to a large extent the number of prompt neutrons emitted in fission. The mass, charge, and TKE yields are determined event-by-event, for each fissioning system, and are parameterized in terms of the “equivalent” incident neutron energy, which is defined as the energy of a fictitious neutron incident on a A − 1 target, which would produce the same excitation energy of the fissioning A system. Other ingredients that play a major role in our calculations, are discussed in previous publications [10, 13]
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