Fragment characteristics from fission of 238U and 234U induced by 6.5–9.0 MeV bremsstrahlung

Göök, Alf; Chernykh, M.; Eckardt, C.; Enders, J.; Neumann-Cosel, P. von; Oberstedt, Andreas; Oberstedt, S.; Richter, A.

doi:10.1016/j.nuclphysa.2010.12.012

Cited by 28 publications

(10 citation statements)

References 30 publications

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“…Those targets can be made available; some of them of spectroscopic quality, to, secondly, allow investigating correlations with fission fragment characteristics. With the S-DALINAC bremsstrahlung facility [82] at the Darmstadt Technical University or the future ELI-NP [83][84][85] high-intense mono-energetic photon source at IFINN, Bucharest, excellent facilities for this part of the measurement program are or will soon be available.…”

Section: Future γ-Ray Data Needsmentioning

confidence: 99%

Future research program on prompt $\gamma$ -ray emission in nuclear fission

et al. 2015

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Abstract. In recent years the measurement of prompt fission γ-ray spectra (PFGS) has gained renewed interest, after about forty years since the first comprehensive studies of the reactions 235 U(n th , f), 239 Pu(n th , f) and 252 Cf(sf). The renaissance was initiated by requests for new values especially for γ-ray multiplicity and average total energy release per fission in neutron-induced fission of 235 U and 239 Pu. Both isotopes are considered the most important ones with respect to the modeling of innovative cores required for the Generation-IV reactors, the majority working with fast neutrons. During the last 5 years we have conducted a systematic study of spectral data for thermal-neutron-induced fission on 235 U and 241 Pu as well as for the spontaneous fission of 252 Cf with unprecedented accuracy. From the new data we conclude that those reactions do not considerably contribute to the observed heat excess and suspect other reactions playing a significant role. Possible contributions may originate from fast-neutron-induced reactions on 238 U, which is largely present in the fuel, or from γ-induced fission from neutron capture in the construction material. A first experiment campaign on prompt γ-ray emission from fast-neutron-induced fission on 235,238 U was successfully performed in order to test our assumptions. In the following we attempt to summarize, what has been done in the field to date, and to motivate future measurement campaigns exploiting dedicated neutron and photon beams as well as upcoming highly efficient detector assemblies.

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Section: Future γ-Ray Data Needsmentioning

confidence: 99%

Future research program on prompt $\gamma$ -ray emission in nuclear fission

et al. 2015

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“…The preneutron mass distributions measured in Refs. [18,19,56] also show analogous fine structure around the A = 134 mass number. It is seen from Figs.…”

Section: Discussion Of the Resultsmentioning

confidence: 81%

“…Although this behavior gives general description of the energy dependence of the contribution of asymmetric modes STI and STII, it does not provide quantitative estimates of probabilities of the modes. Furthermore, it is shown in the works that analyzed the photofission modes of 238 U [19] and neutroninduced fission of 235 U [15,23] that the width of the STI mode is approximately two times less than the width of STII, and, hence, it not enough to compare just the yields of specific mass chains, i.e., the amplitudes of the modes, but one has to take into account the areas of the corresponding distributions. Only one work, namely Ref.…”

Section: Discussion Of the Resultsmentioning

confidence: 99%

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Mass yield distributions and fission modes in photofission ofU238below 20 MeV

et al. 2015

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Photon activation technique is used to obtain photofission mass distributions of 238 U after irradiation in a bremsstrahlung beam with end-point energies 19.5, 29.1, 48.3, and 67.7 MeV. The weights of the symmetric (SL) and asymmetric (STI and STII) modes in the mass distributions of photofission of 238 U and neutron-induced fission of 235,238 U at the average excitation energies of up to 20 MeV are calculated on the basis of the obtained results and other available data. The weight of the SL mode increases by about an order of magnitude as the average excitation energy increases from 8.5 to 17 MeV, while the weight of the STI mode decreases by two times, and the weight of the STII mode slightly increases. It is shown that the peak-to-valley ratios in photofission of 238 U and neutron-induced fission of 235 U are very close across almost the whole studied energy range. A similar conclusion is made concerning the behavior of asymmetric and symmetric fission modes in photofission of 238 U and neutron-induced fission of 235 U and 238 U.

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“…Recent experiments at the superconducting Darmstadt electron linear accelerator S-DALINAC [3] on photofission of 234,238 U and 232 Th [4,5] have studied these quantities in some detail for energies around the fission barrier. A twin Frisch-grid ionization chamber with a solid target located at the common cathode [6] was used in these studies.…”

Section: Introductionmentioning

confidence: 99%

Recent developments for an active UF₆gas target for photon-induced fission experiments

Freudenberger

Eckardt

Enders

et al. 2013

EPJ Web of Conferences

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Abstract. Recent developments for an active uranium-hexafluoride-loaded gas target as well as results on the detector gas properties are presented. The gas of choice is a mixture of argon with small amounts of UF 6 . This contribution presents the experimental setup and focusses on the electron drift velocity with increasing UF 6 content. A time-dependent decrease in electron drift velocity is observed in our setup.

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Fragment characteristics from fission of 238U and 234U induced by 6.5–9.0 MeV bremsstrahlung

Cited by 28 publications

References 30 publications

Future research program on prompt $\gamma$ -ray emission in nuclear fission

Future research program on prompt $\gamma$ -ray emission in nuclear fission

Mass yield distributions and fission modes in photofission ofU238below 20 MeV

Recent developments for an active UF₆gas target for photon-induced fission experiments

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Fragment characteristics from fission of 238U and 234U induced by 6.5–9.0 MeV bremsstrahlung

Cited by 28 publications

References 30 publications

Future research program on prompt $\gamma$ -ray emission in nuclear fission

Future research program on prompt $\gamma$ -ray emission in nuclear fission

Mass yield distributions and fission modes in photofission ofU238below 20 MeV

Recent developments for an active UF6gas target for photon-induced fission experiments

Contact Info

Product

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Recent developments for an active UF₆gas target for photon-induced fission experiments