Two-component exciton model

Dobeš, Jan; Běták, E.

doi:10.1007/bf01419519

Cited by 47 publications

(25 citation statements)

References 21 publications

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“…For a neutron ejectile of energy E the rate is given by [14] where σ k,inv is the inverse reaction cross section (calculated within the optical model framework) and E * is the total excitation energy of the system. The calculated probability for pre-equilibrium neutron emission is shown in the upper panel of Fig.…”

Section: Multichance Fissionmentioning

confidence: 99%

Event-by-event evaluation of the prompt fission neutron spectrum from239Pu(n,f)

et al. 2012

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Section: Multichance Fissionmentioning

confidence: 99%

Event-by-event evaluation of the prompt fission neutron spectrum from239Pu(n,f)

et al. 2012

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“…Some consequences of their proposal are also discussed by Gupta [5]. It appears, however, that the approach of [4] and [5-1 brings along serious mathematical and numerical complications. Although theoretically very interesting, this approach is therefore not very suitable for introduction into routine pre-equilibrium calculations.…”

Section: Introductionmentioning

confidence: 92%

“…In Sect. 4 we discuss some related observations on the meaning of the effective mfp values occurring in exciton models. Section5 summarizes our conclusions.…”

Section: Introductionmentioning

confidence: 98%

“…For consistency as well as for practical reasons it would therefore be desirable to use expressions of the same type in both precompound and compound-decay model calculations. A possible way to achieve this has recently been sug-gested by Dobeg and B~tAk [4], who use two-fermion instead of one-fermion Pauli master equations to describe the precompound-decay processes. Some consequences of their proposal are also discussed by Gupta [5].…”

Section: Introductionmentioning

confidence: 99%

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Comments on the state densities and the transition rates in the pre-equilibrium exciton model

Akkermans

Gruppelaar

1985

Z Physik A

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It is proposed to renormalize the exciton-state densities used in models for precompound decay such that the summed state densities agree with the expressions employed in equilibrium statistical models. In this way a close fit can be guaranteed between preequilibrium model calculations and the results of equilibrium statistical models for the evaporative stage of the reaction. The consequences of this proposal for the internal transition rates of the pre-equilibrium exciton model are analyzed. The matrix element for the residual interaction is obtained not from a phenomenological parametrization, but from the nucleon mean free path in nuclear matter. It is demonstrated that the proposed renormalization, from one-component Fermi-gas formulas to two-fermion expressions for the state densities, leads to strongly improved agreement of the effective exciton-model values for the nucleon mean free path in nuclear matter with realistic estimates. It is proved that the particle-hole state densities for a two-component Fermi gas, summed over the allowed exciton-state numbers, agree with the phenomenological state-density expressions used in statistical Hauser-Feshbach models.

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“…5) The energy range of interest is 100 keV-200 MeV because atmospheric neutrons are very abundant in this energy range. 12) The physics of DHORIN is mainly based on the 2D-exciton model, 13) the Hauser-Feshbach formulation 14) and the generalized evaporation model. 15) The main advantage of this code is that it is able to calculate all the needed quantities (cross sections, level densities and transmission coefficients) for all nucleus that have to be treated during a reaction.…”

Section: Monte Carlo Simulations With Dhorinmentioning

confidence: 99%

Monte Carlo Simulation of Neutrons, Protons, Ions and Alpha Particles Involved in Soft Errors in Advanced Memories

Wrobel

Saigné

2011

Progress in Nuclear Science and Technology

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Due to cosmic rays, electronic devices such as SRAM may undergo some dysfunctions such as single event upsets also called Soft errors. A crucial issue for aerospace applications is to be able to predict the Soft Error rate of a given device in a given environment. In this work, we present a predictive tool which deals with protons and heavy ions for space applications and with neutrons for atmospheric applications. Moreover, it deals with alpha particles which can be emitted naturally within the device, during nuclear decay of polluting uranium, thorium and their daughter nuclei. Natural alpha emitters from materials, such as hafnium, are also considered. Thus, the novelty of the code is its ability to address the issues of space, avionic and ground level applications. The Monte Carlo approach allows calculating simply the single event upset and multiple bit upset cross sections as well as the associated Soft Error rates. To state whether an error occurs or not, the code is able to consider well known criterions such as the critical energy deposited in a sensitive volume or the ambipolar diffusion model.

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Two-component exciton model

Cited by 47 publications

References 21 publications

Event-by-event evaluation of the prompt fission neutron spectrum from239Pu(n,f)

Event-by-event evaluation of the prompt fission neutron spectrum from239Pu(n,f)

Comments on the state densities and the transition rates in the pre-equilibrium exciton model

Monte Carlo Simulation of Neutrons, Protons, Ions and Alpha Particles Involved in Soft Errors in Advanced Memories

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