Prompt fission<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>γ</mml:mi></mml:math>-ray spectrum characteristics from<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Pu</mml:mi><mml:mprescripts /><mml:none /><mml:mn>240</mml:mn></mml:mmultiscripts><mml:mo>(</mml:mo><mml:mi>sf</mml:mi><mml:mo>)</mml:mo></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Pu</mml:mi><mml:mprescripts /><mml:none /><mml:mn>242</mml

Oberstedt, S.; Oberstedt, Andreas; Gatera, Angélique; Göök, Alf; Hambsch, F.‐J.; Meynier, André; Sibbens, G.; Vanleeuw, D.; Vidali, M.

doi:10.1103/physrevc.93.054603

Cited by 27 publications

(25 citation statements)

References 9 publications

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“…The state-ofthe-art scintillation detectors made of LaBr 3 (Ce) (50.8 mm × 50.8 mm and 76.2 mm × 76.2 mm in diameter and length) have excellent time resolution (300 ps for coincidence γ -rays from 60 Co) and good energy resolution (3% at 661 keV). These detectors were used in several recent measurements of PFGS from different fissioning systems [10,11,13,14] and are used in this work as the main reference detectors to facilitate the comparison. The BaF 2 scintillators had a high detection threshold at around 400 keV so results from these detectors are excluded from the analysis and not presented in this work.…”

Section: Methodsmentioning

confidence: 99%

“…While recent measurements have focused on thermalneutron-induced fission [10][11][12] and spontaneous fission [13,14], very little PFG information exists for fast-neutroninduced fission [15,16]. In this work PFGS and their average characteristics for fast-neutron-induced fission on 238 Uw e r e studied at energies of 1.9 MeV and 4.8 MeV to gain information on the possible energy dependence of PFG characteristics below second chance fission at 6 MeV.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

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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“…Hence, this technique should be considered as an alternative, if recorded spectra are obtained from a low number of events (see Ref. [8] and Refs. therein).…”

Section: Resultsmentioning

confidence: 99%

“…We obtained first results on PFGS characteristics from the spontaneous fission of 240 Pu and 242 Pu [8].…”

Section: Introductionmentioning

confidence: 99%

Prompt fissionγ-ray data from spontaneous fission and the mechanism of fission-fragment de-excitation

et al. 2017

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Abstract. The investigation of prompt γ -ray emission in nuclear fission has a great relevance for the assessment of prompt heat generation in a reactor core and for the better understanding of the de-excitation mechanism of fission fragments. Some years ago experimental data was scarce and available only from a few fission reactions, 233,235 U(n th , f), 239 Pu(n th , f), and 252 Cf(sf). Initiated by a high priority data request published by the OECD/NEA a dedicated prompt fission γ -ray measurement program is being conducted at the Joint Research Centre Geel. In recent years we obtained new and accurate prompt fission γ -ray spectrum (PFGS) characteristics (average number of photons per fission, average total energy per fission and mean photon energy) from 252 Cf(sf), 235 U(n th , f) and 239,241 Pu(n th , f) within 2% of uncertainty. In order to understand the dependence of prompt fission γ -ray emission on the compound nuclear mass and excitation energy, we started a first measurement campaign on spontaneously fissioning plutonium and curium isotopes. Results on PFGS characteristics from 240,242 Pu(sf) show a dependence on the fragment mass distribution rather than on the average prompt neutron multiplicity, pointing to a more complex competition between prompt fission γ -ray and neutron emission.

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“…Some years ago, a collaboration of scientists from JRC Geel (the former JRC IRMM) and other institutes took the lead in establishing a dedicated measurement programme on prompt fission neutron [10,11] and fission γ-ray characteristics [12][13][14][15][16][17] responding to a high-priority data request of the OECD NEA. Here, we report about our most recent measurement of prompt fission γ-ray spectral PFGS characteristics from neutron-induced fission on 239 Pu.…”

Section: Introductionmentioning

confidence: 99%

Prompt fissionγ-ray characteristics from neutron-induced fission on ²³⁹Pu and the time-dependence of prompt-γray emission

et al. 2018

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Abstract. Recent years have seen an increased interest in prompt fission γ-ray (PFG) measurements motivated by a high priority request of the OECD/NEA for high precision data, mainly for the nuclear fuel isotopes 235 U and 239 Pu. Our group has conducted a PFG measurement campaign using state-of-the-art lanthanum halide detectors for all the main actinides to a precision better than 3%. The experiments were performed in a coincidence setup between a fission trigger and γ-ray detectors. The time-of-flight technique was used to discriminate photons, traveling at the speed of light, and prompt fission neutrons. For a full rejection of all neutrons below 20 MeV, the PFG time window should not be wider than a few nanoseconds. This window includes most PFG, provided that no isomeric states were populated during the de-excitation process. When isomeric states are populated, PFGs can still be emitted up to 1 µs after the instant of fission or later. To study these γ-rays, the detector response to neutrons had to be determined and a correction had to be applied to the γ-ray spectra. The latest results for PFG characteristics from the reaction 239 Pu(n th ,f) will be presented, together with an analysis of PFGs emitted up to 200 ns after fission in the spontaneous fission of 252 Cf as well as for thermal-neutron induced fission on 235 U and 239 Pu. The results are compared with calculations in the framework of the Hauser-Feshbach Monte Carlo code CGMF and FIFRELIN.

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Prompt fissionγ-ray spectrum characteristics fromPu240(sf)andPu242

Cited by 27 publications

References 9 publications

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

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

Prompt fissionγ-ray data from spontaneous fission and the mechanism of fission-fragment de-excitation

Prompt fissionγ-ray characteristics from neutron-induced fission on ²³⁹Pu and the time-dependence of prompt-γray emission

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Prompt fissionγ-ray spectrum characteristics fromPu240(sf)andPu242

Cited by 27 publications

References 9 publications

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

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

Prompt fissionγ-ray data from spontaneous fission and the mechanism of fission-fragment de-excitation

Prompt fissionγ-ray characteristics from neutron-induced fission on 239Pu and the time-dependence of prompt-γray emission

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Prompt fissionγ-ray characteristics from neutron-induced fission on ²³⁹Pu and the time-dependence of prompt-γray emission