###
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

^{252}Cf and the neutroninduced fission of^{235}U and^{239}Pu 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^{239}Pu(n,f).- 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}

}