Fission Data Systematics

Märten, H.; Ruben, A.; Seeliger, D.; Düring, I.; Polster, D.

doi:10.1007/978-3-642-58113-7_228

Cited by 5 publications

(10 citation statements)

References 5 publications

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“…According to Ruben and co-workers [6,7], the energy conservation for each pair of nascent fragments at scission is given by…”

Section: Partition Of the Txe Between Complementary Ffmentioning

confidence: 99%

“…The method is based on the following physical assumptions and models: statistical equilibrium at scission is reached, the Fermi-Gas description of fragment level densities in the range of available excitation energies at scission is appropriate and the generalized super-fluid model of Ignatyuk [5] for the level density parameters of fragments can be applied. As in other papers (see [6][7][8][9] and references therein), the deformation energies of nascent fragments are calculated considering the fragments as rotational ellipsoids nearly touching at the scission point, with the deformability determined from the liquid drop model (LDM) with shell corrections taken into account.…”

Section: Introductionmentioning

confidence: 99%

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Modelling of the total excitation energy partition including fragment deformation and excitation energies at scission

Morariu

Tudora

Hambsch³

et al. 2012

J. Phys. G: Nucl. Part. Phys.

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In the frame of refined prompt neutron emission models used for evaluation purposes, the partition of the total excitation energy (TXE) between fully accelerated fission fragments plays an important role. In this work the TXE partition between complementary fission fragments is obtained by taking into account the energy components at scission. The method consists of two steps: the calculation of additional deformation energies of nascent fragments (which are relaxed into excitation energy at full acceleration) and the partition of the available excitation energy at scission (obtained by subtracting the calculated deformation energies from TXE) assuming statistical equilibrium. The obtained fragment excitation energies, as the sum of deformation and excitation energy components at scission, are then used in the frame of the Point-by-Point model to describe experimental data of prompt fission quantities. This TXE partition method was applied to the following fissioning systems: 233,235 U(n th ,f), 239 Pu(n th ,f), 237 Np(n,f) at 0.8 and 5.5 MeV incident energies and 252 Cf(SF). The presented procedure of TXE partition is based exclusively on models and straightforward assumptions practically without the need for adjustable parameters (the parameters have been adjusted a priori and to global systematics). It allows the prediction of prompt neutron emission data and, therefore, may be successfully used for evaluation purposes.

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“…According to Ruben and co-workers [6,7], the energy conservation for each pair of nascent fragments at scission is given by…”

Section: Partition Of the Txe Between Complementary Ffmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modelling of the total excitation energy partition including fragment deformation and excitation energies at scission

Morariu

Tudora

Hambsch³

et al. 2012

J. Phys. G: Nucl. Part. Phys.

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“…In the calculations of prompt fission neutron energy spectrum and multiplicity of actinides, some important approaches, the Maxwellian, Watt spectrum [3], Los Alamos (LA) model [4,5], the Dresden model [6] and the Hauser-Feshbach statistical model [7] have been developed. The LA model, which has good predictive power with fewer input parameters, is widely used.…”

Section: Introductionmentioning

confidence: 99%

Multi-modal calculations of prompt fission neutrons from²³⁸U(n, f) at low induced energy

Zhong¹,

Tieshuan²

2011

Chinese Phys. C

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Properties of prompt fission neutrons from 238U(n, f) are calculated for incident neutron energies below 6 MeV using the multi-modal model, including the prompt fission neutron spectrum, the average prompt fission neutron multiplicity, and the prompt fission neutron multiplicity as a function of the fission fragment mass v(A) (usually named “sawtooth" data) The three most dominant fission modes are taken into account. The model parameters are determined on the basis of experimental fission fragment data. The predicted results are in good agreement with the experimental data.

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“…In the prompt fission neutron energy spectrum and multiplicity of actinide calculation, several new models instead of the Maxwellian and Watt spectra [7] have been developed in the recent two decades. The Dresden model [8] and the Hauser-Feshbach calculations [9] require too many input data though they probably yield more accurate results. The widelyused Los Alamos (LA) model [10] accounts for some physical effects such as the variety of the FFs with various excitation energies and has good predictive power with using less input parameters.…”

Section: Introductionmentioning

confidence: 99%

Multi-modal analysis for low energy neutron-induced fission of²³⁵U

Zheng¹,

Tieshuan²,

Ding³

et al. 2010

Chinese Phys. C

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Low energy neutron induced fission of 235U is studied in the framework of the multi-modal fission model. The fission fragment properties, such as the yields, the average total kinetic energy distribution and the average neutron separation energy, are investigated for incident neutron energies from thermal to 6.0 MeV. The multi-modal fission approach is also used to evaluate the prompt fission neutron multiplicity and spectra for the neutron-induced fission of 235U with an improved version of the Los Alamos model for incident neutrons below the (n, nf) threshold. The three most dominant fission modes are taken into account. The model parameters are determined on the basis of experimental data. The calculated results are in good agreement with the experimental data.

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Fission Data Systematics

Cited by 5 publications

References 5 publications

Modelling of the total excitation energy partition including fragment deformation and excitation energies at scission

Modelling of the total excitation energy partition including fragment deformation and excitation energies at scission

Multi-modal calculations of prompt fission neutrons from²³⁸U(n, f) at low induced energy

Multi-modal analysis for low energy neutron-induced fission of²³⁵U

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Fission Data Systematics

Cited by 5 publications

References 5 publications

Modelling of the total excitation energy partition including fragment deformation and excitation energies at scission

Modelling of the total excitation energy partition including fragment deformation and excitation energies at scission

Multi-modal calculations of prompt fission neutrons from238U(n, f) at low induced energy

Multi-modal analysis for low energy neutron-induced fission of235U

Contact Info

Product

Resources

About

Multi-modal calculations of prompt fission neutrons from²³⁸U(n, f) at low induced energy

Multi-modal analysis for low energy neutron-induced fission of²³⁵U