Predictions of characteristics of prompt-fission 
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-ray spectra from the 
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 reaction up to 
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Billnert, R.; Oberstedt, S.

doi:10.1103/physrevc.96.034612

Cited by 9 publications

(19 citation statements)

References 32 publications

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“…Still, all values are somewhat lower for fast neutrons than for thermal ones, which is certainly opposite to our expectations, see Ref. [5] for n + 238 U. As a matter of fact, this was already observed for the system n + 239 Pu (cf.…”

Section: Data Analysis and Resultscontrasting

confidence: 99%

“…Taking into account that the average promptfission γ -ray multiplicities for this reaction agree well within 1% for incident neutrons of 1.7 and 1.9 MeV kinetic energy, which may be inferred from the calculations in Ref. [5], the emission spectrum at 1.9 MeV can be used to obtain the correct normalization for the spectrum at 1.7 MeV by adjusting the latter to the first one. This was done for the γ -ray energy region 0.5 MeV < E γ < 6 MeV to reproduce the same integrated multiplicity, and the result is shown in Fig.…”

Section: Normalization Based On 238 U(n F)mentioning

confidence: 83%

“…[1]. Moreover, the average multiplicity was estimated back then based on systematics [5] and on results from a previous experiment with thermal neutrons [16]. However, with the recent thermal-neutron induced measurement by Ref.…”

Section: Discussionmentioning

confidence: 99%

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Prompt $$\gamma $$-ray characteristics from $$^{235}$$U(n, f) at $${\overline{E}}_{n}$$ = 1.7 MeV

Lebois

Oberstedt

et al. 2020

Eur. Phys. J. A

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In response to nuclear data requests by OECD NEA, we present here the first results with respect to promptfission γ -ray spectra characteristics for fast neutrons on 235 U. For that we have analyzed previously taken prompt-fission γ -ray data from the reaction 235 U(n, f) induced by fast neutrons of average energy E n = 1.7 MeV and spectral properties were deduced. It was expected that the values would be somewhat higher than for thermal-neutron induced fission of the same system, which at a first glance turned out to be not the case. However, taking the different prompt time windows relative to the coincidence timing resolution between both measurements into account, this discrepancy could be resolved. The results are an average multiplicity M γ = 7.45 ± 0.48 γ rays per fission and an average total γ -ray energy release in fission E γ,tot = (6.03 ± 0.47) MeV, which includes an additional relative uncertainty of 4% from the time window correction. The corresponding average energy per γ ray is γ = (0.81 ± 0.04) MeV.

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Section: Data Analysis and Resultscontrasting

confidence: 99%

Section: Normalization Based On 238 U(n F)mentioning

confidence: 83%

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Prompt $$\gamma $$-ray characteristics from $$^{235}$$U(n, f) at $${\overline{E}}_{n}$$ = 1.7 MeV

Lebois

Oberstedt

et al. 2020

Eur. Phys. J. A

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“…Despite the weaker increase of PFG emission relative to PFN emission, our results suggest that the assumption that neutron emission entirely precedes γ emission, is not valid and that competition of both play a considerable role during the deexcitation of fission fragments [4][5][6]. Figure 11 contains-as a function of incident neutron energy-the average values for each quantity from this work, together with results from various fission models, including PbP [42], GEF [41], and FREYA [43], as well as calculations based on systematics [44]. The calculated observables of PFG from GEF and FREYA have reasonable agreement with the experimental results and also exhibit a slightly increasing trend in terms of average γ multiplicity and total energy per fission.…”

Section: Discussionmentioning

confidence: 98%

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 dependence of the average PFGM ( M γ ) with the incident neutron energy E n is calculated from an empirical law proposed by Oberstedt [299]:…”

Section: Prompt Fission Gamma Spectra/multiplicitiesmentioning

confidence: 99%

The joint evaluated fission and fusion nuclear data library, JEFF-3.3

et al. 2020

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The joint evaluated fission and fusion nuclear data library 3.3 is described. New evaluations for neutroninduced interactions with the major actinides 235 U, 238 U and 239 Pu, on 241 Am and 23 Na, 59 Ni, Cr, Cu, Zr, Cd, Hf, W, Au, Pb and Bi are presented. It includes new fission yields, prompt fission neutron spectra and average number of neutrons per fission. In addition, new data for radioactive decay, thermal neutron scattering, gamma-ray emission, neutron activation, delayed neutrons and displacement damage are presented. JEFF-3.3 was complemented by files from the TENDL project. The libraries for photon, proton, deuteron, triton, helion and alpha-particle induced reactions are from TENDL-2017. The demands for uncertainty quantification in modeling led to many new covariance data for the evaluations. A comparison between results from model calculations using the JEFF-3.3 library and those from benchmark experiments for criticality, delayed neutron yields, shielding and decay heat, reveals that JEFF-3.3 performes very well for a wide range of nuclear technology applications, in particular nuclear energy.

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Predictions of characteristics of prompt-fission γ -ray spectra from the n+U238 reaction up to

Cited by 9 publications

References 32 publications

Prompt $$\gamma $$-ray characteristics from $$^{235}$$U(n, f) at $${\overline{E}}_{n}$$ = 1.7 MeV

Prompt $$\gamma $$-ray characteristics from $$^{235}$$U(n, f) at $${\overline{E}}_{n}$$ = 1.7 MeV

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

The joint evaluated fission and fusion nuclear data library, JEFF-3.3

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