Fission fragment energy correlation measurements for the thermal neutron fission of 239Pu and 235U

Asghar, M. I.; Caïtucoli, F.; Perrin, Paul B.; Wagemans, C.

doi:10.1016/0375-9474(78)90510-9

Cited by 36 publications

(15 citation statements)

References 11 publications

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“…As it is seen from Figs. 12 and 13 all three scission criteria give a satisfactory agreement with experimental data [49,50,66]. In the calculations for the 240 Pu nucleus the excitation energy is larger than in the experiment [50].…”

Section: Asymmetry and Excess Of The Energy Distributionsupporting

confidence: 57%

“…Among experimental studies the works of Zhdanov and coworkers [49,65,66] should be mentioned, where the first four moments of the energy distribution were studied. There is also a paper of Asghar and co-workers [50] where the third and fourth moments of the energy distribution were investigated using fission reactions induced by thermal neutrons. The main result of these experimental studies is the constancy of the shape of the energy distribution for symmetrical fission in a wide interval of the parameter Z 2 /A.…”

Section: Asymmetry and Excess Of The Energy Distributionmentioning

confidence: 98%

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Nuclear scission and fission-fragment kinetic-energy distribution: Study within three-dimensional Langevin dynamics

2008

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Section: Asymmetry and Excess Of The Energy Distributionsupporting

confidence: 57%

Section: Asymmetry and Excess Of The Energy Distributionmentioning

confidence: 98%

Nuclear scission and fission-fragment kinetic-energy distribution: Study within three-dimensional Langevin dynamics

2008

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“…The TKE data are taken from [9][10][11], and the one-sigma values about the experimental average TKE values are taken from [12]. Calculations with both global and local (fragment) constraints are shown.…”

Section: Resultsmentioning

confidence: 99%

Microscopic Calculation of Fission Fragment Energies for the 239Pu(nth,f) Reaction

Younes¹,

Gogny²

2011

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We calculate the total kinetic and excitation energies of fragments produced in the thermalinduced fission of 239 Pu. This result is a proof-of-principle demonstration for a microscopic approach to the calculation of fission-fragment observables for applied data needs. In addition, the calculations highlight the application of a fully quantum mechanical description of scission, and the importance of exploring scission configurations as a function of the moments of the fragments, rather than through global constraints on the moments of the fissioning nucleus.

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“…Measurements of the average total kinetic energy per fragment mass T KE (A) and the width of the (assumed) Gaussian distribution σ 2 T KE (A) were used to reconstruct the total kinetic energy distribution Y (T KE). Figure 4 shows the measured data sets on T KE (A) from Wagemans et al [21], Surin et al [22], Asghar et al [28], and Tsuchiya et al [24], as well as the result of a least-square fit of the data. The data by Asghar et al were taken directly from the published figure in Ref.…”

Section: Andmentioning

confidence: 99%

Advanced Monte Carlo modeling of prompt fission neutrons for thermal and fast neutron-induced fission reactions onPu239

et al. 2011

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Prompt fission neutrons following the thermal and 0.5 MeV neutron-induced fission reaction of 239 Pu are calculated using a Monte Carlo approach to the evaporation of the excited fission fragments. Exclusive data such as the multiplicity distribution P (ν), the average multiplicity as a function of fragment mass ν(A), and many others are inferred in addition to the most used average prompt fission neutron spectrum χ (E in , E out), as well as average neutron multiplicity ν. Experimental information on these more exclusive data help constrain the Monte Carlo model parameters. The calculated average total neutron multiplicity is ν c = 2.871 in very close agreement with the evaluated value ν e = 2.8725 present in the ENDF/B-VII.0 library. The neutron multiplicity distribution P (ν) is in very good agreement with the evaluation by Holden and Zucker. The calculated average spectrum differs in shape from the ENDF/B-VII.0 spectrum, evaluated with the Madland-Nix model. In particular, we predict more neutrons in the low-energy tail of the spectrum (below about 300 keV) than the Madland-Nix calculations, casting some doubts on how much scission neutrons contribute to the shape of the low-energy tail of the spectrum. The spectrum high-energy tail is very sensitive to the total kinetic energy distribution of the fragments as well as to the total excitation energy sharing at scission. Present experimental uncertainties on measured spectra above 6 MeV are too large to distinguish between various theoretical hypotheses. Finally, comparisons of the Monte Carlo results with experimental data on ν(A) indicate that more neutrons are emitted from the light fragments than the heavy ones, in agreement with previous works.

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Fission fragment energy correlation measurements for the thermal neutron fission of 239Pu and 235U

Cited by 36 publications

References 11 publications

Nuclear scission and fission-fragment kinetic-energy distribution: Study within three-dimensional Langevin dynamics

Nuclear scission and fission-fragment kinetic-energy distribution: Study within three-dimensional Langevin dynamics

Microscopic Calculation of Fission Fragment Energies for the 239Pu(nth,f) Reaction

Advanced Monte Carlo modeling of prompt fission neutrons for thermal and fast neutron-induced fission reactions onPu239

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