Fission-fragment properties in 
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 between 1 and 30 MeV

Duke, D. L.; Tôvesson, F.; Laptev, A.; Mosby, S.; Hambsch, F.‐J.; Bryś, T.; Vidali, M.

doi:10.1103/physrevc.94.054604

Cited by 51 publications

(35 citation statements)

References 22 publications

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“…For the diffusion tensor we used the modified Einstein relation with an effective temperature that accounts for the quantum features of Our calculated TKE's for 240 Pu are compared with experimental data from (a) [61], (b) [62], and (c) [63]. We compare the 239 U fission TKE from post-neutron (post-n) and preneutron emission with (d) experimental data from [60]. 232 Pa TKE's are compared with experimental data for thermal neutrons in (e) [64].…”

Section: Discussionmentioning

confidence: 99%

Analysis of the total kinetic energy of fission fragments with the Langevin equation

et al. 2017

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We analyzed the total kinetic energy (TKE) of fission fragments with three-dimensional Langevin calculations for a series of actinides and Fm isotopes at various excitation energies. This allowed us to establish systematic trends of TKE with Z 2 /A 1/3 of the fissioning system and as a function of excitation energy. In the mass-energy distributions of fission fragments we see the contributions from the standard, super-long and super-short (in the case of 258 Fm) fission modes. For the fission fragments mass distribution of 258 Fm we obtained a single peak mass distribution. The decomposition of TKE into the prescission kinetic energy and Coulomb repulsion showed that decrease of TKE with growing excitation energy is accompanied by a decrease of prescission kinetic energy. It was also found that transport coefficients (friction and inertia tensors) calculated by a microscopic model and by macroscopic models give drastically different behavior of TKE as a function of excitation energy. The results obtained with microscopic transport coefficients are much closer to experimental data than those calculated with macroscopic ones.

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Section: Discussionmentioning

confidence: 99%

Analysis of the total kinetic energy of fission fragments with the Langevin equation

et al. 2017

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“…Previous measurements [37] have shown that the average TKE is decreased by 1.33 MeV when the incident neutron energy is increased from 1.9 to 4.8 MeV for this fissioning system. Hence, an extra 4.23 MeV of TXE is available for neutron and γ emission based on the energy balance as follows:…”

Section: Discussionmentioning

confidence: 99%

Statistical study of the prompt-fission γ -ray spectrum for U238(n, f ) in the fast-neutron region

Lebois

Wilson

et al. 2018

Phys. Rev. C

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Prompt-fission γ -ray spectra (PFGS) have been measured for the 238 U(n, f ) reaction using fast neutrons produced by the LICORNE directional neutron source. Fission events were detected with an ionization chamber containing actinide samples placed in the neutron beam, and the coincident prompt-fission γ rays were measured using a number of LaBr 3 scintillation detectors and a cluster of nine phoswich detectors from the PARIS array. Prompt-fission γ rays (PFGs) were discriminated from prompt-fission neutrons using the time-of-flight technique over distances of around 35 cm. PFG emission spectra were measured at two incident neutron energies of 1.9 and 4.8 MeV for 238 U(n, f )andalsofor 252 Cf (sf ) as a reference. Spectral characteristics of PFG emission, such as mean γ multiplicity and average total γ -ray energy per fission, as well as the average γ -ray energy, were extracted. The sensitivity of these results to the width of the time window and the type of spectral unfolding procedure used to correct for the detector responses was studied. Iteration methods were found to be more stable in low-statistics data sets. The measured values at E n = 1.9 MeV were found to be the mean γ multiplicity M γ = 6.54 ± 0.19, total released energy per fission E γ,tot = 5.25 ± 0.20 MeV, and the average γ -ray energy ǫ γ = 0.80 ± 0.04 MeV. Under similar conditions, the values at E n = 4.8 MeV were measured to be M γ = 7.31 ± 0.46, E γ,tot = 6.18 ± 0.65 MeV, and ǫ γ = 0.84 ± 0.11 MeV.

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“…The complete T K E evolution with E n can be found in Ref. [11] and [12]. Because of the 4-5 u resolution of the detector, the data presented there is smoothed to 4 u resolution.…”

Section: Resultsmentioning

confidence: 99%

“…Using conservation of energy, momentum, and nucleon number, the masses of the fission fragments can be determined with 4-5 amu resolution while correcting the data for mass-dependent effects. The process is described in detail in [11] and [12].…”

Section: Discussionmentioning

confidence: 99%

Fission-fragment total kinetic energy and mass yields for neutron-induced fission of ²³⁵U and ²³⁸U with E_n =200 keV – 30 MeV

et al. 2017

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Abstract. The average Total Kinetic Energy (T K E) release and fission-fragment yields in neutron-induced fission of 235 U and 238 U was measured using a Frisch-gridded ionization chamber. These observables are important nuclear data quantites that are relevant to applications and for informing the next generation of fission models. The measurements were performed a the Los Alamos Neutron Science Center and cover E n = 200 keV -30 MeV. The double-energy (2E) method was used to determine the fission-fragment yields and two methods of correcting for prompt-neutron emission were explored. The results of this study are correlated mass and T K E data.

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Fission-fragment properties in U238(n,f) between 1 and 30 MeV

Cited by 51 publications

References 22 publications

Analysis of the total kinetic energy of fission fragments with the Langevin equation

Analysis of the total kinetic energy of fission fragments with the Langevin equation

Statistical study of the prompt-fission γ -ray spectrum for U238(n, f ) in the fast-neutron region

Fission-fragment total kinetic energy and mass yields for neutron-induced fission of ²³⁵U and ²³⁸U with E_n =200 keV – 30 MeV

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Fission-fragment properties in U238(n,f) between 1 and 30 MeV

Cited by 51 publications

References 22 publications

Analysis of the total kinetic energy of fission fragments with the Langevin equation

Analysis of the total kinetic energy of fission fragments with the Langevin equation

Statistical study of the prompt-fission γ -ray spectrum for U238(n, f ) in the fast-neutron region

Fission-fragment total kinetic energy and mass yields for neutron-induced fission of 235U and 238U with En =200 keV – 30 MeV

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Fission-fragment total kinetic energy and mass yields for neutron-induced fission of ²³⁵U and ²³⁸U with E_n =200 keV – 30 MeV