Isomeric ratio measurements with the ILL LOHENGRIN spectrometer

Chebboubi, A.; Kessedjian, G.; Litaize, O.; Sérot, O.; Faust, H.; Bernard, D.; Blanc, A.; Köster, U.; Méplan, O.; Mutti, P.; Sage, C.

doi:10.1051/epjconf/201611108003

Cited by 4 publications

(6 citation statements)

References 16 publications

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“…Few measurements and evaluations show that isotopic yield ratios differ according to the fissioning actinide. Different works [3,6,7] support the hypothesis that the isomeric ratio is weakly dependant on the fissioning system and the projectile energy which means that the large enough difference between the isotope yields in actinide fissions may also be found in the isomer yields. Finally, for our application we need to measure isomer yield ratios in photofission at 9 MeV with a LaBr 3 (Ce) detector (for its good time and energy resolutions).…”

Section: Snm Identification Methodsmentioning

confidence: 99%

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C-BORD project: “Effective container inspection at BORDer control points”

et al. 2017

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Abstract. In the framework of the C-BORD project of the H2020 programme to provide a safety chain for container inspection at border control points, CEA-DAM is involved to develop an identification method of Special Nuclear Material. Using active interrogation the main purpose is to specifically discriminate fissile actinides from fertile ones through the detection of γ-rays emitted by very short-lived isomers. We present here the interdependance of such a project with nuclear data. We first introduce the SNM identification method. Then, will be detailed the needs in nuclear data and first yields of specific short-lived isomers of 252 Cf spontaneous fission. Perspectives and conclusions will end the article.

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Section: Snm Identification Methodsmentioning

confidence: 99%

“…Isomer yields are nuclear data challenging to obtain. Their knowledge goes beyond borders security applications, since they will play a key role in nuclear power plant safety [1], and in the constraint and improvement of existing Monte-Carlo fission particles emission codes [2,3].…”

Section: Introductionmentioning

confidence: 99%

C-BORD project: “Effective container inspection at BORDer control points”

et al. 2017

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“…Regarding the evolution of the isomeric ratio versus the fission fragment kinetic energy, the mechanism for total angular momentum generation is studied [16].…”

Section: Discussionmentioning

confidence: 99%

Prompt particle emission in correlation with fission fragments

Litaize¹,

Sérot²,

Thulliez³

et al. 2017

EPJ Web Conf.

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Abstract. The de-excitation process of primary fission fragments can be simulated with the FIFRELIN Monte Carlo code leading to an estimation of prompt fission observables such as neutron/gamma multiplicities and spectra in correlation with fission fragments. De-excitation cascades are simulated using the notion of nuclear realization following Becvar terminology generalized to neutron/gamma coupled emission. A nuclear realization is a random set of nuclear levels (energy, spin, parity) in association with partial widths for neutron, gamma or electron emission. Experimental data related to electromagnetic transitions in the discrete level region are taken from RIPL-3 database. When nuclear level structure is completely unknown (in the continuum region), level density and strength function models are used. In between these regions, our partial knowledge of nuclear structure is completed by models up to a fixed maximum level density. In this way the whole available experimental information is accounted for. FIFRELIN is ruled by five free input parameters driving the excitation energy sharing, the rotational energy and the spin distribution of primary fission fragments. These five free parameters are determined to match a target observable such as the average total prompt neutron multiplicity (ν). Once this procedure is completed, the whole set of fission observables can be compared with experimental results. Obviously the number of observables obtained within this code is higher than what is available from measurements. This code can therefore provide useful insights into the compatibility between models and a whole set of fission observables. In the present work the influence of shell corrections is reported on level densities and prompt fission neutron spectra (PFNS). The impact of the input data such as primary fission fragment total kinetic energy (TKE) is also addressed. Average prompt neutron multiplicity as a function of TKE is also estimated for each mass split and compared to recent measurements. The presence of structures in the calculations (especially for light nuclei) is clearly related to the nuclear level scheme. Various situations occur and an overestimation (or underestimation) of the calculated number of emitted neutrons can be correlated to the light or heavy fragment of a pair and to a restricted energy range. In addition prompt fission gamma spectra (PFGS) are estimated for selected fragment mass ranges and compared to recent measurements. In this way the presence of specific gamma-ray transitions can be established.

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“…This quantity can be compared with other measurements and can be used by different models such as FIFRELIN [15,16] to validate the input data and the underlying models. The study of the symmetry region can give insight on the Brosa fission modes [17] by looking at the kinetic energy distributions [18]. The local odd-even effect [13] give some information on the pairs breaking but also on the neutron emission process.…”

Section: Other Observables Of Interest To Study the Fission Processmentioning

confidence: 99%

Measurements of Fission Products Yields with the LOHENGRIN mass spectrometer at ILL

Chebboubi¹,

Julien-Laferrière²,

Nicholson³

et al. 2020

EPJ Web Conf.

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The CEA in collaboration with ILL and LPSC has developed a measurement program on symmetric and heavy mass fission product distributions. The combination of measurements with ionisation chamber and Ge detectors is necessary to describe precisely the heavy fission product region in mass and charge. Recently, new measurements of fission yields and kinetic energy distributions, for different fissioning systems (233,235 U(nth, f),241 Am(2nth, f) and 239,241 Pu(nth, f), were performed with recoil spectrometer LOHENGRIN. The focus has been done on the self-normalization of the data to provide new absolute measurements, independently of any libraries along with the experimental covariance matrix. To reach precise measurements, a new experimental procedure was developed along with a new analysis method.

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Isomeric ratio measurements with the ILL LOHENGRIN spectrometer

Cited by 4 publications

References 16 publications

C-BORD project: “Effective container inspection at BORDer control points”

C-BORD project: “Effective container inspection at BORDer control points”

Prompt particle emission in correlation with fission fragments

Measurements of Fission Products Yields with the LOHENGRIN mass spectrometer at ILL

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