Influence of scission neutrons on the prompt fission neutron spectrum calculations

The calculation of the Prompt Fission Neutron Spectrum (PFNS) was performed using the FIFRELIN Monte Carlo code simulating the de-excitation of the whole fission fragments. This de-excitation is governed by the Hauser-Feshbach statistical model, which has the advantage to take into account the conse...

Full description

Saved in:
Bibliographic Details
Published inEPJ Web of Conferences Vol. 146; p. 4027
Main Authors Serot, Olivier, Litaize, Olivier, Chebboubi, Abdelaziz
Format Journal Article Conference Proceeding
LanguageEnglish
Published Les Ulis EDP Sciences 01.01.2017
Subjects
Cleavage
Computer simulation
Conservation laws
Energy conservation
Excitation
Fission
Fragments
Gamma emission
Neutron emission
Neutrons
Statistical models
Online AccessGet full text

Cover

More Information
Summary:The calculation of the Prompt Fission Neutron Spectrum (PFNS) was performed using the FIFRELIN Monte Carlo code simulating the de-excitation of the whole fission fragments. This de-excitation is governed by the Hauser-Feshbach statistical model, which has the advantage to take into account the conservation laws for the energy, spin and parity of the initial and final states. In this way, the competition between prompt neutron and prompt gamma emission can be properly accounted for. Assuming that the prompt neutron emission comes only from an evaporation process of the fully accelerated fission fragments, our calculations are not able to reproduce satisfactorily the experimental data. In this context, we have added an additional source of neutrons that may arise during the sudden rupture of the neck (the so-called scission neutrons). Applied in the case of the spontaneous fission of 252Cf, our PFNS calculations show a very good agreement with the Mannhart evaluation by accounting for a 2% scission neutron contribution.
ISSN:2100-014X
2101-6275
2100-014X
DOI:10.1051/epjconf/201714604027