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Title: Monte Carlo approach to sequential {gamma}-ray emission from fission fragments

Abstract

A Monte Carlo simulation of the fission fragment statistical decay based on a sequential neutron followed by {gamma}-ray emission is proposed. The {gamma}-ray energy spectrum is calculated as a function of the mass of the fission fragments and integrated over the whole mass distribution. The prompt {gamma}-ray multiplicity distribution, both the average number of emitted {gamma} rays and the average {gamma}-ray energy as a function of the mass of the fission fragments [respectively, N{sub {gamma}}(A) and <{epsilon}{sub {gamma}}>(A)], are also assessed. The {gamma}-{gamma} correlations emitted from both light and heavy fragments are calculated as well as correlations between {gamma}-ray energies. Results are reported for the neutron-induced fission of {sup 235}U (at 0.53 MeV neutron energy) and for the spontaneous fission of {sup 252}Cf.

Authors:
; ; ;  [1];  [2]
+ Show Author Affiliations
  1. Theoretical Division, Nuclear Physics Group, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
  2. PADNWP, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
Publication Date:
OSTI Identifier:
20771199
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 73; Journal Issue: 1; Other Information: DOI: 10.1103/PhysRevC.73.014602; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; CALIFORNIUM 252; COMPUTERIZED SIMULATION; CORRELATIONS; ENERGY SPECTRA; FISSION FRAGMENTS; FISSION PRODUCTS; GAMMA RADIATION; GAMMA SPECTRA; MASS DISTRIBUTION; MEV RANGE; MONTE CARLO METHOD; MULTIPLICITY; NEUTRON REACTIONS; NEUTRONS; PHOTON EMISSION; SPONTANEOUS FISSION; STATISTICAL MODELS; URANIUM 235

Citation Formats

Lemaire, S., Talou, P., Kawano, T., Madland, D.G., and Chadwick, M.B. Monte Carlo approach to sequential {gamma}-ray emission from fission fragments. United States: N. p., 2006. Web. doi:10.1103/PhysRevC.73.014602.
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Lemaire, S., Talou, P., Kawano, T., Madland, D.G., & Chadwick, M.B. Monte Carlo approach to sequential {gamma}-ray emission from fission fragments. United States. doi:10.1103/PhysRevC.73.014602.
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Lemaire, S., Talou, P., Kawano, T., Madland, D.G., and Chadwick, M.B. Sun . "Monte Carlo approach to sequential {gamma}-ray emission from fission fragments". United States. doi:10.1103/PhysRevC.73.014602.
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@article{osti_20771199,
title = {Monte Carlo approach to sequential {gamma}-ray emission from fission fragments},
author = {Lemaire, S. and Talou, P. and Kawano, T. and Madland, D.G. and Chadwick, M.B.},
abstractNote = {A Monte Carlo simulation of the fission fragment statistical decay based on a sequential neutron followed by {gamma}-ray emission is proposed. The {gamma}-ray energy spectrum is calculated as a function of the mass of the fission fragments and integrated over the whole mass distribution. The prompt {gamma}-ray multiplicity distribution, both the average number of emitted {gamma} rays and the average {gamma}-ray energy as a function of the mass of the fission fragments [respectively, N{sub {gamma}}(A) and <{epsilon}{sub {gamma}}>(A)], are also assessed. The {gamma}-{gamma} correlations emitted from both light and heavy fragments are calculated as well as correlations between {gamma}-ray energies. Results are reported for the neutron-induced fission of {sup 235}U (at 0.53 MeV neutron energy) and for the spontaneous fission of {sup 252}Cf.},
doi = {10.1103/PhysRevC.73.014602},
journal = {Physical Review. C, Nuclear Physics},
number = 1,
volume = 73,
place = {United States},
year = {Sun Jan 15 00:00:00 EST 2006},
month = {Sun Jan 15 00:00:00 EST 2006}
}
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Journal Article:
DOI:  10.1103/PhysRevC.73.014602
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  • ; ; ; ... - Physical Review. C, Nuclear Physics
    We have implemented a Monte Carlo simulation of fission fragment statistical decay by sequential neutron emission. Within this approach, we calculate the center-of-mass and laboratory prompt neutron energy spectra as a function of the mass of fission fragments and integrated over the whole mass distribution. We also assess the prompt neutron multiplicity distribution P({nu}), both the average number of emitted neutrons and the average neutron energy as a function of the mass of the fission fragments [respectively {nu}(A) and <E>(A)]. We investigate the average total energy available for prompt {gamma}-ray emission as a function of the mass of the fissionmore » fragments E{sub {gamma}}(A). We also calculate neutron-neutron correlations such as the full matrix {nu}(A,TKE) as well as correlations between neutron energies. Two assumptions for partitioning the total available excitation energy among the light and heavy fragments are considered. Results are reported for the neutron-induced fission of {sup 235}U (at neutron energy of 0.53 MeV) and for the spontaneous fission of {sup 252}Cf.« less

  • ; - Physical Review. C, Nuclear Physics
    A Monte Carlo simulation of the fission fragment deexcitation process was developed in order to analyze and predict postfission-related nuclear data which are of crucial importance for basic and applied nuclear physics. The basic ideas of such a simulation were already developed in the past. In the present work, a refined model is proposed in order to make a reliable description of the distributions related to fission fragments as well as to prompt neutron and {gamma} energies and multiplicities. This refined model is mainly based on a mass-dependent temperature ratio law used for the initial excitation energy partition of themore » fission fragments and a spin-dependent excitation energy limit for neutron emission. These phenomenological improvements allow us to reproduce with a good agreement the {sup 252}Cf(sf) experimental data on prompt fission neutron multiplicity {nu}(A), {nu}(TKE), the neutron multiplicity distribution P({nu}), as well as their energy spectra N(E), and lastly the energy release in fission.« less

  • ; - Phys. Rev. C; (United States)
    The consequences of the evaporation of prompt neutrons and ..gamma.. rays from primary fission fragments in the spontaneous fission of /sup 252/Cf have been examined by a Monte Carlo method. A semiempirical mass equation and experimental values of total kinetic energies are used to obtain the sum of excitation energies of complementary fragments. The division of this energy between complementary fragments is determined by the two-spheroid model for the scission configuration. The prompt neutron multiplicity distribution gives a value of 3.68 for the average number of prompt neutrons in /sup 252/Cf (sf). Calculated values of the average number of promptmore » neutrons as a function of fragments mass are in good agreement with the experimental values. Calculated results for the charge dependence of total ..gamma..-ray energies show an odd-even effect, whereas no such effect is apparent in the charge dependence of the average number of neutrons. Mass and charge distributions of secondary fission fragments are also well reproduced in the calculations.« less

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  • ; ; ; ... - Astrophysical Journal
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