Abstract
Fission observables in the case of 252Cf(sf) are investigated by exploring several models involved in the excitation energy sharing and spin-parity assignment between primary fission fragments. In a first step the parameters used in the FIFRELIN Monte Carlo code “reference route" are presented: two parameters for the mass dependent temperature ratio law and two constant spin cut-off parameters for light and heavy fragment groups respectively. These parameters determine the initial fragment entry zone in excitation energy and spin-parity (E*, Jπ). They are chosen to reproduce the light and heavy average prompt neutron multiplicities. When these target observables are achieved all other fission observables can be predicted. We show here the influence of input parameters on the saw-tooth curve and we discuss the influence of a mass and energy-dependent spin cut-off model on gamma-rays related fission observables. The part of the model involving level densities, neutron transmission coefficients or photon strength functions remains unchanged.
Highlights
The primary fission fragment (FF) entry zone in excitation energy and spin-parity (E*, Jπ) is one of the key points in the simulation of the fission process leading to prompt particle emission
Several models have to be used in order to calculate level densities, photon strength functions, optical model potential for neutron transmission coefficients
In the FIFRELIN Monte Carlo code, the reference calculation route usually involves five input parameters. They are chosen to calculate the initial states of primary fragments and reproduce a fission target observable such as the average prompt neutron multiplicity ν
Summary
The primary fission fragment (FF) entry zone in excitation energy and spin-parity (E*, Jπ) is one of the key points in the simulation of the fission process leading to prompt particle emission. In the FIFRELIN Monte Carlo code, the reference calculation route usually involves five input parameters (here one of them, the fraction of rigid body moment of inertia is fixed to 1.). They are chosen to calculate the initial states of primary fragments and reproduce a fission target observable such as the average prompt neutron multiplicity ν. On the other hand we will discuss the influence of the spin cut-off parameter model used to assign the initial FF spin
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