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Title: Neutron-induced fission: properties of prompt neutron and γ rays as a function of incident energy

We have applied the Hauser-Feshbach statistical theory, in a Monte-Carlo implementation, to the de-excitation of fission fragments, obtaining a reasonable description of the characteristics of neutrons and gamma rays emitted before beta decays toward stability. Originally implemented for the spontaneous fission of 252Cf and the neutroninduced fission of 235U and 239Pu at thermal neutron energy, in this contribution we discuss the extension of the formalism to incident neutron energies up to 20 MeV. For the emission of pre-fission neutrons, at incident energies beyond second-chance fission, we take into account both the pre-equilibrium and statistical pre-fission components. Phenomenological parameterizations of mass, charge and TKE yields are used to obtain the initial conditions for the fission fragments that subsequently decay via neutron and emissions. Finally, we illustrate this approach for 239Pu(n,f).
Authors:
 [1] ;  [1] ; ORCiD logo [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Report Number(s):
LA-UR-16-20240
Journal ID: ISSN 2100-014X
Grant/Contract Number:
AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
EPJ Web of Conferences
Additional Journal Information:
Journal Volume: 122; Conference: The 5th International Workshop on Compound-Nuclear Reactions and Related Topics , Tokyo (Japan), 19-23 Oct 2015; Journal ID: ISSN 2100-014X
Publisher:
EDP Sciences
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS
OSTI Identifier:
1459846

Stetcu, Ionel, Talou, Patrick, and Kawano, Toshihiko. Neutron-induced fission: properties of prompt neutron and γ rays as a function of incident energy. United States: N. p., Web. doi:10.1051/epjconf/201612201012.
Stetcu, Ionel, Talou, Patrick, & Kawano, Toshihiko. Neutron-induced fission: properties of prompt neutron and γ rays as a function of incident energy. United States. doi:10.1051/epjconf/201612201012.
Stetcu, Ionel, Talou, Patrick, and Kawano, Toshihiko. 2016. "Neutron-induced fission: properties of prompt neutron and γ rays as a function of incident energy". United States. doi:10.1051/epjconf/201612201012. https://www.osti.gov/servlets/purl/1459846.
@article{osti_1459846,
title = {Neutron-induced fission: properties of prompt neutron and γ rays as a function of incident energy},
author = {Stetcu, Ionel and Talou, Patrick and Kawano, Toshihiko},
abstractNote = {We have applied the Hauser-Feshbach statistical theory, in a Monte-Carlo implementation, to the de-excitation of fission fragments, obtaining a reasonable description of the characteristics of neutrons and gamma rays emitted before beta decays toward stability. Originally implemented for the spontaneous fission of 252Cf and the neutroninduced fission of 235U and 239Pu at thermal neutron energy, in this contribution we discuss the extension of the formalism to incident neutron energies up to 20 MeV. For the emission of pre-fission neutrons, at incident energies beyond second-chance fission, we take into account both the pre-equilibrium and statistical pre-fission components. Phenomenological parameterizations of mass, charge and TKE yields are used to obtain the initial conditions for the fission fragments that subsequently decay via neutron and emissions. Finally, we illustrate this approach for 239Pu(n,f).},
doi = {10.1051/epjconf/201612201012},
journal = {EPJ Web of Conferences},
number = ,
volume = 122,
place = {United States},
year = {2016},
month = {6}
}