First experimental prompt 
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-ray spectra in fast-neutron-induced fission of 
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Laborie, J.-M.; Billnert, R.; Bélier, G.; Oberstedt, S.; Taïeb, J.

doi:10.1103/physrevc.98.054604

Cited by 9 publications

(12 citation statements)

References 23 publications

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“…Such kind of estimates were not necessary anymore with the preceding PFGS measurement from n + 238 U [4]. We only assumed that a difference in incident neutron energy between 1.7 and 1.9 has a negligible impact on PFGS characteristics, which was inferred from semi-empirical model calculations [5] and corroborated by both a previous measurement at 1.6 MeV incident neutron energy [6] and a recent evaluation [17].…”

Section: Discussionmentioning

confidence: 88%

“…1 Comparison of the unfolded prompt-fission γ -ray spectra for n + 238 U at E n = 1.9 MeV [4] and 1.7 MeV [2], of which the latter was adjusted to the first one (see text for details). In addition, a spectrum is shown that was taken with a BGO detector at E n = 1.6 MeV for the same fissioning system [6] to the spectra obtained with the massive BaF 2 clusters (about 70,000 events). For that reason a reliable unfolding of the detector response according to…”

Section: Data Analysis and Resultsmentioning

confidence: 99%

“…1. There, another emission spectrum is shown that was taken with a bismuth germanate (BGO) detector for incident neutrons of 1.6 MeV kinetic energy [6]. It serves as verification of the assumed similarity of the first two spectra concerning both shape and absolute height.…”

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

confidence: 98%

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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: Discussionmentioning

confidence: 88%

Section: Data Analysis and Resultsmentioning

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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“…A key question, essential for reactor applications and basic fundamental physics, is how the prompt γ -ray emission in fission is affected when the excitation energy E x of the fissioning system increases. Currently, only limited experimental data exist where the PFGs have been extracted for more than one E x [8,[15][16][17][18][19]. Here we present measurements of the PFG characteristics from the 240 Pu(d,pf) reaction, extracted over a range of 241 Pu * excitation energies.…”

Section: Introductionmentioning

confidence: 99%

Excitation energy dependence of prompt fission γ -ray emission from Pu241*

et al. 2021

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Prompt fission γ rays (PFGs) resulting from the 240 Pu(d,pf) reaction have been measured as a function of fissioning nucleus excitation energy E x at the Oslo Cyclotron Laboratory. We study the average total PFG multiplicity per fission, the average total PFG energy released per fission, and the average PFG energy. No significant changes in these characteristics are observed over the range 5.75 < E x < 8.25 MeV. The physical implications of this result are discussed. The experimental results are compared to simulations conducted using the computational fission model FREYA. We find that FREYA reproduces the experimental PFG characteristics within 8% deviation across the E x range studied. Previous excitation energy-dependent PFG measurements conducted below the second-chance fission threshold have large uncertainties, but are generally in agreement with our results within a 2σ confidence interval. However, both a published parametrization of the PFG energy dependence and the most recent PFG evaluation included in ENDF/B-VIII.0 were found to poorly describe the PFG excitation-energy dependence observed in this and previous experiments.

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“…For nuclear applications, information about the prompt neutrons is crucial for calculating the reactivity in reactors, while precise knowledge about the prompt γ rays is important for the assessment of the decay heat released in the reactor core. Concerning the latter we have contributed in the past years with a number of precise measurements of prompt γ-ray spectra from the spontaneous [1][2][3] as well as thermal [4][5][6] and fast neutron [7,8] induced fission of various compound systems. In these experiments prompt fission γ-ray spectra (PFGS) were measured and their characteristics, i.e.…”

Section: Introductionmentioning

confidence: 99%

Prompt fission gamma rays and their angular distributions

et al. 2018

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In a recent measurement of prompt γ rays from the spontaneous fission of 252Cf an experimental setup was chosen that allowed the study of angular correlations between γ rays and the nuclei from which they were emitted. The observed angular distribution of the prompt fission γ rays was then analyzed to estimate the relative contributions from radiation of different multipolarity. From that we hope to obtain more detailed information about the early stage of the de-excitation process of fission fragments, right after prompt neutron emission. First preliminary results are presented below.

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First experimental prompt γ -ray spectra in fast-neutron-induced fission of U238

Cited by 9 publications

References 23 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

Excitation energy dependence of prompt fission γ -ray emission from Pu241*

Prompt fission gamma rays and their angular distributions

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