Comparing different energy partitions at scission used in prompt emission model codes GEF and Point-by-Point

Tudora, Anabella; Hambsch, F.‐J.; Visan, I.; Giubega, G.

doi:10.1016/j.nuclphysa.2015.04.012

Cited by 34 publications

(19 citation statements)

References 30 publications

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“…<ε> k is the average energy of the k-th emitted neutron in the center-of-mass frame, a k and T k are the level density parameter and the temperature of the k-th residual nucleus, respectively. For the first emitted prompt neutron, k=1, E r (0) = E * is the excitation energy of the initial fragment (before the first neutron is emitted) resulting from the TXE partition by modelling at scission [5,6]. To solve the residual temperature equations (1) the following approximations are needed: (a) non-energy dependent level density parameters of initial and residual fragments, e.g.…”

Section: Equation Of Residual Temperature Following the Successive Emmentioning

confidence: 99%

“…An example is the prompt γ-ray energy corresponding to each initial fragment A, Z at a given TKE. This is calculated in the PbP model as (6) in which E*(A,Z,TKE) is the excitation energy of the initial fragment (resulting from the TXE partition by modelling at scission), ν(A,Z,TKE) is the prompt neutron multiplicity, the neutron separation energy is an average value calculated as S kn /k (with k the number of prompt neutrons emitted sequentially). The first order momentum of the prompt neutron spectrum in the centre-of-mass frame <ε> entering Eq.…”

Section: Validation Of Sequential Emission Calculation By Comparison mentioning

confidence: 99%

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Parameterisation of the residual temperature distribution based on the modelling of successive emission of prompt neutrons

Tudora

Hambsch

2018

EPJ Web Conf.

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Abstract.A new deterministic modelling taking into account the successive emission of prompt neutrons from initial fragments of a fragmentation range {A, Z, TKE} constructed as in the Point-by-Point (PbP) treatment is described. The good agreement of different prompt emission quantities obtained from this modelling (e.g. ν(A), ν(TKE), Eγ(A), Eγ(TKE), etc.) with the experimental data and the results of the PbP model and other Monte-Carlo models validates the present modelling of sequential emission. The distributions of different residual quantities, including the residual temperature distributions P(T) of light and heavy fragments allow to obtain a new parameterisation of P(T) which can be used in the PbP model and the Los Alamos model.

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Section: Equation Of Residual Temperature Following the Successive Emmentioning

confidence: 99%

Section: Validation Of Sequential Emission Calculation By Comparison mentioning

confidence: 99%

Parameterisation of the residual temperature distribution based on the modelling of successive emission of prompt neutrons

Tudora

Hambsch

2018

EPJ Web Conf.

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“…After scission, the FF relax to a less deformed shape and the deformation energy E def will convert into intrinsic energy [2,5].…”

Section: A Word Of Caution: E Rotmentioning

confidence: 99%

A methodology for the intercomparison of nuclear fission codes using TALYS

et al. 2017

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Abstract. Codes for the calculation of fission observables are frequently used to describe experimentally observed phenomena as well as provide predictions in cases where measurements are missing. Assumptions in the models, and tuning of parameters within the codes, often result in a good reproduction of experimental data. In this work we propose a methodology, coded in the newly developed program DELFIN (De-Excitation of FIssion fragmeNts), that can be used to compare some of the assumptions of the various models. Our code makes use of the fission fragments information after scission and processes them in an independent and consistent fashion to obtain measurable fission observables (such asν(A) distributions and Isomeric Fission Yield ratios).All the available information from the models, such as fragments' excitation energies, spin distributions and yields are provided as input to DELFIN that uses the nuclear reaction code TALYS to handle the deexcitation of the fission fragments. In this way we decouple the fragments relaxation from the actual fission models.We report here the first results of a comparison carried out on the GEF, Point-by-Point and FREYA models for thermal fission of 235 U and 239 Pu and spontaneous fission of 252 Cf.

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“…from thermal up to about 5 MeV) are very scarce, being measured only for a few major actinides. At En above [5][6] MeV, where the multi-chance fission occurs, these data are completely missing. The only way is to use ν(A) predicted by models.…”

Section: Introductionmentioning

confidence: 99%

Point-by-point model calculation of the prompt neutron multiplicity distribution ν(A) in the incident neutron energy range of multi-chance fission

Tudora

Hambsch²,

Tobosaru

2017

EPJ Web Conf.

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Abstract. Prompt neutron multiplicity distributions ν(A) are required for prompt emission correction of double energy (2E) measurements of fission fragments to determine pre-neutron fragment properties. The lack of experimental ν(A) data especially at incident neutron energies (En) where the multi-chance fission occurs impose the use of ν(A) predicted by models. The Point-by-Point model of prompt emission is able to provide the individual ν(A) of the compound nuclei of the main and secondary nucleus chains undergoing fission at a given En. The total ν(A) is obtained by averaging these individual ν(A) over the probabilities of fission chances (expressed as total and partial fission cross-section ratios). An indirect validation of the total ν(A) results is proposed. At high En, above 70 MeV, the PbP results of individual ν(A) of the first few nuclei of the main and secondary nucleus chains exhibit an almost linear increase. This shape is explained by the damping of shell effects entering the super-fluid expression of the level density parameters. They tend to approach the asymptotic values for most of the fragments. This fact leads to a smooth and almost linear increase of fragment excitation energy with the mass number that is reflected in a smooth and almost linear behaviour of ν(A).

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Comparing different energy partitions at scission used in prompt emission model codes GEF and Point-by-Point

Cited by 34 publications

References 30 publications

Parameterisation of the residual temperature distribution based on the modelling of successive emission of prompt neutrons

Parameterisation of the residual temperature distribution based on the modelling of successive emission of prompt neutrons

A methodology for the intercomparison of nuclear fission codes using TALYS

Point-by-point model calculation of the prompt neutron multiplicity distribution ν(A) in the incident neutron energy range of multi-chance fission

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