Monte Carlo Hauser - Feshbach predictions of prompt fission γ rays : Application to n th + 235 U , n th + 239 Pu , and 252 Cf ( sf )
نویسندگان
چکیده
The prompt neutron and γ emission from primary fission fragments are calculated for thermal neutron induced fission of 235U and 239Pu and for spontaneous fission of 252Cf using a Monte Carlo Hauser-Feshbach approach for the evaporation of the excited fission fragments. Remaining free model parameters, such as excitation energy sharing and initial spin distribution, are determined by comparison of the neutron emission characteristics with experimental data. Using the obtained parameters the γ -ray characteristics, e.g., γ spectrum, multiplicity distribution, average multiplicity and energy, and multiplicity distribution, are calculated and compared with available experimental data.
منابع مشابه
Monte Carlo Hauser-Feshbach Modeling of Prompt Fission Neutrons and Gamma Rays
The decay of fission fragments is studied through Monte Carlo Hauser-Feshbach model calculations taking into account the competition between the emissions of prompt fission neutrons and gamma rays. The importance of initial excitation energy and spin distribution in the primary light and heavy fragments is demonstrated through comparison with experimental data. Excitation energy sorting mechani...
متن کامل- th / 0 60 30 71 v 1 2 9 M ar 2 00 6 Total Prompt Energy Release in the Neutron - Induced Fission of 235 U , 238 U , and 239 Pu
This study addresses, for the first time, the total prompt energy release and its components for the fission of U, U, and Pu as a function of the kinetic energy of the neutron inducing the fission. The components are extracted from experimental measurements, where they exist, together with model-dependent calculation, interpolation, and extrapolation. While the components display clear dependen...
متن کاملCalculation of n+Th Reaction Cross Sections in the En≤20 MeV Energy Range
Consistent calculation and analysis of neutron scattering data of Th with optical model, semiclassical model includes both the Hauser-Feshbach theory and the exciton model, and the coupled channel theory is carried out in the En≤20 MeV energy range based on the experimental data of total, nonelastic-scattering, fission, and other reaction cross section and elastic-scattering angular distributio...
متن کاملMcnp-polimi Simulation of Active and Passive Measurements on Uranium and Plutonium Objects
This paper presents the validation of the Monte Carlo code MCNP-PoliMi for the simulation of nuclear safeguards experiments with plutonium and uranium metal based on fast time-correlation measurements. A comparison is presented between experimental data acquired with the Nuclear Materials Identification System and the Monte Carlo simulations. The measurements and simulations were performed for ...
متن کاملTotal prompt energy release in the neutron - induced fission of 235 U , 238 U , and 239 Pu
This study addresses, for the first time, the total prompt energy release and its components for the fission of 235U, 238U, and 239Pu as a function of the kinetic energy of the neutron inducing the fission. The components are extracted from experimental measurements, where they exist, together with model-dependent calculation, interpolation, and extrapolation. While the components display clear...
متن کامل