Impact of FIFRELIN input parameters on fission observables

A. Chebboubi (1) , O. Litaize (1) , O. Serot (1)

1 CEA-DES (ex-DEN) - CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire)

Evaluated nuclear data are essential for nuclear reactor studies. In order tosignificantly improve the precision of nuclear data, more and more fundamental fissionmodels are used in the evaluation processing. Therefore, tests of fission models becomea central issue. In this framework, FIFRELIN (FIssion Fragments Evaporation Leadingto an Investigation of Nuclear data) is a Monte Carlo code developed in order to modelizefission fragments de-excitation through the emission of neutrons,gamma and conversionelectrons. To be performed a FIFRELIN calculation relies on several models such as gammastrength function and nuclear level density and of more empirical hypothesis such as totalexcitation energy repartition or angular momentum given by the fission reaction. Moreover,pre-emission mass yield and kinetic energy distribution per mass are necessary toprocess the simulation. A set of five free parameters are chosen to reproduce a targetobservable. Often this observable corresponds to the mean neutron multiplicity for heavyand light fragment. In this work, the impact of the set of parameters over different outputobservables (neutron emission probability, neutron multiplicity as function of the fissionfragment mass) is investigated.

Mots clés: FIFRELIN; neutron multiplicity; sawtooth; gamma multiplicity

Domaines: Physique Nucléaire Expérimentale [nucl-ex]; Physique Nucléaire Théorique [nucl-th]

A. Chebboubi, O. Litaize, O. Serot. Impact of FIFRELIN input parameters on fission observables. 6th Workshop on Nuclear Fission and Spectroscopy of Neutron-Rich Nuclei, Mar 2017, Chamrousse, France. ⟨hal-02417755⟩