Evaluation ofpfor239Pu: Impact for Applications of the Fluctuations at Low Energy

Fort, E.; Fréhaut, J.; Tellier, H.; Long, Patricia

doi:10.13182/nse88-a23566

Cited by 28 publications

(12 citation statements)

References 7 publications

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“…A phenomenological formalism [14,15] is applied to ν p . It consists first in breaking down the fission process into independent partial waves described with various reachable J π values of the compound nucleus.…”

Section: Mean Number Of Prompt Neutrons Per Fissionmentioning

confidence: 99%

²³⁹Pu nuclear data improvements in thermal and epithermal neutron ranges

Bernard

Fort

Courcelle

et al. 2007

Nd2007

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Abstract. The analysis of k eff multiplicative factor of 100%-MOx cores and plutonium solutions showed a systematic discrepancy between calculation and experiment. The aim of this paper is to propose an improved version of the JEFF-3.1 239 Pu evaluation in the low-energy neutron range. We propose here slight modifications of the evaluation file, consistent with the uncertainties of differential data measurements in sub-thermal/thermal and epithermal ranges, namely: modifications of the sub-thermal fission, capture and total cross sections, and a revised evaluation of ν p from sub-thermal up to 20 eV using a phenomenological formalism. The proposed modifications are described and tested against integral measurements.

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Section: Mean Number Of Prompt Neutrons Per Fissionmentioning

confidence: 99%

²³⁹Pu nuclear data improvements in thermal and epithermal neutron ranges

Bernard

Fort

Courcelle

et al. 2007

Nd2007

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“…The mean number of prompt neutrons emitted following neutron-induced fission of 239 Pu has been measured in a number of experiments [10,11,12,13,14] and was reviewed by Fort et al [15]. Figure 1 shows a selection of this data as well as the associated ENDF/B-VII evaluation [16].…”

Section: A Mean Neutron Multiplicitymentioning

confidence: 99%

Event-by-event study of prompt neutrons fromPu239(n,f)

et al. 2009

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Employing a recently developed Monte-Carlo model, we study the fission of 240 Pu induced by neutrons with energies from thermal to just below the threshold for second chance fission. Current measurements of the mean number of prompt neutrons emitted in fission, together with less accurate measurements of the neutron energy spectra, place remarkably fine constraints on predictions of microscopic calculations. In particular, the total excitation energy of the nascent fragments must be specified to within 1 MeV to avoid disagreement with measurements of the mean neutron multiplicity. The combination of the Monte-Carlo fission model with a statistical likelihood analysis also presents a powerful tool for the evaluation of fission neutron data. Of particular importance is the the fission spectrum, which plays a key role in determining reactor criticality. We show that our approach can be used to develop an estimate of the fission spectrum with uncertainties several times smaller than current experimental uncertainties for outgoing neutron energies of less than 2 MeV.

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“…(Figure 9) Pu-239: The evaluation of ν -(E n ) in JENDL-3.3 is based on the experimental data of Gwin 24,26 and Fréhaut. 25 The evaluation of ν -(E n ) in ENDF/B-VI is based on the evaluation of Fort, 27 after minor renormalization for consistency with the standards of the Cross Section Evaluation Working Group (CSEWG, Brookhaven National Laboratory). JEFF-3.0 adopted the evaluation of Fort, 27 supplemented by calculation by Vladuka 28 above 650 keV.…”

Section: Verificationmentioning

confidence: 99%

Empirical Formulas for Estimation of Fission Prompt Neutron Multiplicity for Actinide Nuclides

Ohsawa¹

2008

Journal of Nuclear and Radiochemical Sciences

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Evaluation of_pfor²³⁹Pu: Impact for Applications of the Fluctuations at Low Energy

Cited by 28 publications

References 7 publications

²³⁹Pu nuclear data improvements in thermal and epithermal neutron ranges

²³⁹Pu nuclear data improvements in thermal and epithermal neutron ranges

Event-by-event study of prompt neutrons fromPu239(n,f)

Empirical Formulas for Estimation of Fission Prompt Neutron Multiplicity for Actinide Nuclides

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Evaluation ofpfor239Pu: Impact for Applications of the Fluctuations at Low Energy

Cited by 28 publications

References 7 publications

239Pu nuclear data improvements in thermal and epithermal neutron ranges

239Pu nuclear data improvements in thermal and epithermal neutron ranges

Event-by-event study of prompt neutrons fromPu239(n,f)

Empirical Formulas for Estimation of Fission Prompt Neutron Multiplicity for Actinide Nuclides

Contact Info

Product

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Evaluation of_pfor²³⁹Pu: Impact for Applications of the Fluctuations at Low Energy

²³⁹Pu nuclear data improvements in thermal and epithermal neutron ranges

²³⁹Pu nuclear data improvements in thermal and epithermal neutron ranges