Measurements of the Mass and Isotopic Yields of the 233U(nth,f) Reaction by the Lohengrin Spectrometer

Martin, F.; Sage, C.; Kessedjian, G.; Sérot, O.; Amouroux, C.; Bacri, C.O.; Bidaud, A.; Billebaud, A.; Capellán, N.; Chabod, S.; Doligez, X.; Faust, H.; Köster, U.; Letourneau, A.; Materna, T.; Mathieu, L.; Méplan, O.; Panebianco, S.

doi:10.1016/j.nds.2014.08.090

Cited by 18 publications

(23 citation statements)

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“…Cross normalisation induces a further new systematic uncertainty, linking the data of the second target to the first one. Figure 7 presents the experimental covariance of our results on 233 U(n th , f) mass yields [2,7].…”

Section: Experimental Mass Yield Covariancementioning

confidence: 98%

“…Recent measurements from [1][2][3] of 233 U fission yields in the heavy region with the Lohengrin spectrometer showed an important discrepancy near the symmetry region in comparison with the evaluations. Thus a new methodology has been developed [3,4] to disentangle the dispersion of measurements in the heavy peak mass region in the descent to symmetrical masses.…”

Section: Nuclear Datamentioning

confidence: 99%

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Experimental programme on absolute fission fragment yields with the lohengrin spectrometer: New optical and statistical methodologies

et al. 2017

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Abstract. The study of fission yields has a major impact on the characterization and understanding of the fission process and is mandatory for reactor applications. In the past with the LOHENGRIN spectrometer of the ILL, priority has been given for the studies in the light fission fragment mass range. The LPSC in collaboration with ILL and CEA has developed a measurement program on symmetric and heavy mass fission fragment distributions. The combination of measurements with ionisation chamber and Ge detectors is necessary to describe precisely the heavy fission fragment region in mass and charge. Recently, new measurements of fission yields and kinetic energy distributions are has been made on the 233 U(n th ,f) reaction. The focus of this work has been on the new optical and statistical methodology and the self-normalization of the data to provide new absolute measurements, independently of any libraries, and the associated experimental covariance matrix. Nuclear dataThe accurate knowledge of fission data in the actinide region is important for studies of innovative nuclear reactor concepts. Today, in the framework of nuclear data evaluation, fission models are necessary to increase the consistency and the precision of the libraries. For instance, post neutron fission yields are actually needed in the current and innovative fuel cycles for the calculation of the inventory and the radiotoxicity of the spent fuel, and the estimation of the residual power after shutdown.Moreover, fission yield measurements supply experimental data to put constraints on fission models and improve their predictive power. In this context, since 2007, various experiments from our collaboration have been performed to investigate fission yields at the Lohengrin spectrometer of the ILL with a special focus on the heavy and symmetry mass region, where there are inconsistencies between models (or evaluations) and the few experimental data.Recent measurements from [1-3] of 233 U fission yields in the heavy region with the Lohengrin spectrometer showed an important discrepancy near the symmetry region in comparison with the evaluations. Thus a new methodology has been developed [3,4] to disentangle the dispersion of measurements in the heavy peak mass region in the descent to symmetrical masses. a

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Section: Experimental Mass Yield Covariancementioning

confidence: 98%

Section: Nuclear Datamentioning

confidence: 99%

Experimental programme on absolute fission fragment yields with the lohengrin spectrometer: New optical and statistical methodologies

et al. 2017

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“…New methodologies were developed in order to improve the precision reachable with this instrument [7][8][9][10]. The ND2016 difference in the descent to the symmetry region seems to be coming from the appearance of a tail at low kinetic energy.…”

Section: Experimental Sidementioning

confidence: 99%

Theoretical investigation of fission fragment kinetic energy distributions in the symmetric mass region for²³³U(n_th,f)

Chebboubi¹,

Sérot²,

Kessedjian³

et al. 2017

EPJ Web Conf.

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Abstract. Fission yields are essential for nuclear reactor studies (decay heat, fuel inventory. . . ) and constitute also one of the main observables needed to improve our understanding of the fission process. The symmetric mass region is of particular interest due to various intriguing properties of the fission fragments already reported in the literature : inversion of the nuclear charge polarization, large width of the fission fragment kinetic energy distribution, strong change of the prompt neutron multiplicity, etc. Recently, measurements of fission yields and kinetic energy distributions in the symmetric mass region were achieved at the LOHENGRIN mass spectrometer of the Institut Laue-Langevin (ILL). This experimental work is challenging due to the low counting rate and the appearance of contaminant masses, leading to pronounced components in the fission fragment kinetic energy distribution. Despite removing the undesirable contributions, the fission fragment kinetic energy distributions still show two components, indicating that the fission process could be modal. To go further and better characterize these components a comparison between our experimental data and Monte Carlo calculations (FIFRELIN code) simulating the de-excitation of the fission fragments for different fission channels will be presented and discussed.

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“…Recent measurements from [1,2] of 233 U fission yields in the heavy region with the Lohengrin spectrometer showed an important discrepancy near the symmetry region when compared to evaluations. This is shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

“…1 where these measurements are displayed with the JEFF-3.1.1 evaluations [3]. Firstly, our work presented here constitutes a deep investigation around and within the symmetry region to explain this disagreement and get accurate fission yields, which is a key element to ensure the self-normalisation of our data [1,2]. A second important goal of our work here is to take this opportunity to study the structures in the fission fragment kinetic energy distributions and use symmetric fission as a laboratory to test fission models.…”

Section: Introductionmentioning

confidence: 99%

²³³U mass yield measurements around and within the symmetry region with the ILL Lohengrin spectrometer

Chebboubi

Kessedjian

Sage

et al. 2016

EPJ Web of Conferences

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Abstract. The study of fission yields has a major impact on the characterization and understanding of the fission process and is mandatory for reactor applications. The LPSC in collaboration with ILL and CEA has developed a measurement program on fission fragment distributions at the Lohengrin spectrometer of the ILL, with a special focus on the masses constituting the heavy peak. We will present in this paper our measurement of the very low fission yields in the symmetry mass region and the heavy mass wing of the distribution for 233 U thermal neutron induced fission. The difficulty due to the strong contamination by other masses with much higher yields will be addressed in the form of a new analysis method featuring the required contaminant correction. The apparition of structures in the kinetic energy distributions and possible interpretations will be discussed, such as a possible evidence of fission modes.

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Measurements of the Mass and Isotopic Yields of the 233U(nth,f) Reaction by the Lohengrin Spectrometer

Cited by 18 publications

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Experimental programme on absolute fission fragment yields with the lohengrin spectrometer: New optical and statistical methodologies

Experimental programme on absolute fission fragment yields with the lohengrin spectrometer: New optical and statistical methodologies

Theoretical investigation of fission fragment kinetic energy distributions in the symmetric mass region for²³³U(n_th,f)

²³³U mass yield measurements around and within the symmetry region with the ILL Lohengrin spectrometer

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Measurements of the Mass and Isotopic Yields of the 233U(nth,f) Reaction by the Lohengrin Spectrometer

Cited by 18 publications

References 0 publications

Experimental programme on absolute fission fragment yields with the lohengrin spectrometer: New optical and statistical methodologies

Experimental programme on absolute fission fragment yields with the lohengrin spectrometer: New optical and statistical methodologies

Theoretical investigation of fission fragment kinetic energy distributions in the symmetric mass region for233U(nth,f)

233U mass yield measurements around and within the symmetry region with the ILL Lohengrin spectrometer

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Product

Resources

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Theoretical investigation of fission fragment kinetic energy distributions in the symmetric mass region for²³³U(n_th,f)

²³³U mass yield measurements around and within the symmetry region with the ILL Lohengrin spectrometer