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

Stetcu, Ionel; Talou, Patrick; Kawano, Toshihiko

doi:10.1051/epjconf/201612201012

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

Abstract

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:

Stetcu, Ionel ^[1]; Talou, Patrick ^[1];

^[1]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Publication Date:: Tue Jun 21 00:00:00 EDT 2016

Research Org.:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1459846

Report Number(s):: LA-UR-16-20240
Journal ID: ISSN 2100-014X; TRN: US1901816

Grant/Contract Number:: AC52-06NA25396

Resource Type:: Accepted Manuscript

Journal Name:: EPJ Web of Conferences (Online)

Additional Journal Information:: Journal Name: EPJ Web of Conferences (Online); 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

Country of Publication:: United States

Language:: English

Subject:: 74 ATOMIC AND MOLECULAR PHYSICS

Citation Formats


                    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., 2016. 
Web.  doi:10.1051/epjconf/201612201012.

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                    Stetcu, Ionel, Talou, Patrick, & Kawano, Toshihiko. Neutron-induced fission: properties of prompt neutron and γ rays as a function of incident energy.  United States.  https://doi.org/10.1051/epjconf/201612201012

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                    Stetcu, Ionel, Talou, Patrick, and Kawano, Toshihiko. Tue .  
"Neutron-induced fission: properties of prompt neutron and γ rays as a function of incident energy".  United States.  https://doi.org/10.1051/epjconf/201612201012.  https://www.osti.gov/servlets/purl/1459846.

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@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 (Online)},

  number       = ,

  volume       = 122,

  place        = {United States},

  year         = {Tue Jun 21 00:00:00 EDT 2016},

  month        = {Tue Jun 21 00:00:00 EDT 2016}

}

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Works referenced in this record:

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Properties of prompt-fission $γ$ rays
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Monte Carlo Simulation for Particle and γ-Ray Emissions in Statistical Hauser-Feshbach Model
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Isomer production ratios and the angular momentum distribution of fission fragments
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Stetcu, I.; Talou, P.; Kawano, T.
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Works referencing / citing this record:

Fission dynamics of ${}^{240}{Pu}$ from saddle to scission and beyond
journal, September 2019

Bulgac, Aurel; Jin, Shi; Roche, Kenneth J.
Physical Review C, Vol. 100, Issue 3
DOI: 10.1103/physrevc.100.034615

Prompt neutron multiplicity distributions inferred from $γ$ -ray and fission fragment energy measurements
journal, November 2019

Lovell, A. E.; Stetcu, I.; Talou, P.
Physical Review C, Vol. 100, Issue 5
DOI: 10.1103/physrevc.100.054610

Determining the average prompt-fission-neutron multiplicity for ${}^{239}{Pu} (n, f)$ via a ${}^{240}{Pu} (α, α^{'} f)$ surrogate reaction
journal, December 2019

Wang, B. S.; Harke, J. T.; Akindele, O. A.
Physical Review C, Vol. 100, Issue 6
DOI: 10.1103/physrevc.100.064609

Angular momentum of fission fragments from microscopic theory
journal, August 2021

Marević, Petar; Schunck, Nicolas; Randrup, Jørgen
Physical Review C, Vol. 104, Issue 2
DOI: 10.1103/physrevc.104.l021601

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

Abstract

Citation Formats

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A global pre-equilibrium analysis from 7 to 200 MeV based on the optical model potential
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