Kinetic energy dependence of fission fragment isomeric ratios for spherical nuclei 132 Sn

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

doi:10.1016/j.physletb.2017.10.067

Cited by 15 publications

(14 citation statements)

References 35 publications

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“…To do this, the Bateman equations need to be solved. Along with this, corrections for the decay during flight also need to be taken into account; this is due to the fact that the distance between target and the experimental focal plane is 23 m. To accurately determine the production rates and the IR along with their respective uncertainties, a Monte-Carlo method [5,14] is being used. This Monte-Carlo Code (MCC) is used as compared to the analytical method as there are quite a few parameters involved in di↵erent corrections, which need to be added.…”

Section: The Analysismentioning

confidence: 99%

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Investigation of fission product isomeric ratios and angular momenta of ¹³²Sn populated in the ²⁴¹Pu(n_th,f) reaction

et al. 2021

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During an experimental campaign performed at the LOHENGRIN recoil spectrometer of the Institut Laue-Langevin (ILL), a kinetic energy dependence of 132Sn fission product isomeric ratio (IR) has been measured by inducing thermal fission of 241Pu. The IRs are deduced using gamma ray spectrometry in coincidence with the ionisation chamber. To interpret these data, we use the FIFRELIN Monte-Carlo code to simulate the de-excitation of the fission fragments. Combining the IRs with the FIFRELIN calculations, the angular momentum distribution with kinetic energy of the doubly magic nucleus of 132Sn was deduced. This will be compared with the angular momentum distribution obtained for the reaction 235U(nth,f) for 132Sn.

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Section: The Analysismentioning

confidence: 99%

“…[4] and references therein. On the other hand, one can study indirectly the angular momenta of the fission fragments by measuring the isomeric ratios of the fission fragments [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Investigation of fission product isomeric ratios and angular momenta of ¹³²Sn populated in the ²⁴¹Pu(n_th,f) reaction

et al. 2021

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“…discussed in ref. [9,10]. This paper will focus on the description of the charge polarisation and the estimation of nanosecond isomeric ratios.…”

Section: Indirect Data Measurementsmentioning

confidence: 99%

Fission fragments observables measured at the LOHENGRIN spectrometer

et al. 2020

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Nuclear fission yields are key data for reactor studies, such as spent fuel inventory or decay heat, and for understanding fission process. Despite a significant effort allocated to measure fission yields during the last decades, the recent evaluated libraries still need improvements in particular in the reduction of the uncertainties. Moreover, some discrepancies between these libraries must be explained. Additional measurements provide complementary information and estimations of experimental correlations, and new kinds of measurements enable to test the models used during the nuclear data evaluation process. A common effort by the CEA, the LPSC and the ILL aims at tackling these issues by providing precise measurements of isotopic and isobaric fission yields with the related variance-covariance matrices. Additionally, the experimental program involves a large range of observables requested by the evaluations, such as kinetic energy dependency of isotopic yields and odd-even effect in order to test the sharing of total excitation energy and the spin generation mechanism. Another example is the complete range of isotopic distribution per mass that allows the determination of the charge polarization, which has to be consistent for complementary masses (pre-neutron emission). For instance, this information is the key observable for the evaluation of isotopic yields. Finally, ionic charge distributions are indirect measurements of nanosecond isomeric ratios as a probe of the nuclear de-excitation path in the (E*, J, π) representation. Measurements for thermal neutron induced fission of 241 Pu have been carried out at the ILL in Grenoble, using the LOHENGRIN mass spectrometer. Methods, results and comparison to models calculations will be presented corresponding to a status on fission fragments observables reachable with this facility.

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“…An experimental program on isomeric ratios (IRs) measurements was developed since 2012 [19]. Especially a focus on the evolution of IR as function of fission product kinetic energy was made [20,21]. Using de-excitation code such as FIFRELIN, an angular momentum distribution can be derived.…”

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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Kinetic energy dependence of fission fragment isomeric ratios for spherical nuclei 132 Sn

Cited by 15 publications

References 35 publications

Investigation of fission product isomeric ratios and angular momenta of ¹³²Sn populated in the ²⁴¹Pu(n_th,f) reaction

Investigation of fission product isomeric ratios and angular momenta of ¹³²Sn populated in the ²⁴¹Pu(n_th,f) reaction

Fission fragments observables measured at the LOHENGRIN spectrometer

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

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Kinetic energy dependence of fission fragment isomeric ratios for spherical nuclei 132 Sn

Cited by 15 publications

References 35 publications

Investigation of fission product isomeric ratios and angular momenta of 132Sn populated in the 241Pu(nth,f) reaction

Investigation of fission product isomeric ratios and angular momenta of 132Sn populated in the 241Pu(nth,f) reaction

Fission fragments observables measured at the LOHENGRIN spectrometer

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

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Product

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Investigation of fission product isomeric ratios and angular momenta of ¹³²Sn populated in the ²⁴¹Pu(n_th,f) reaction

Investigation of fission product isomeric ratios and angular momenta of ¹³²Sn populated in the ²⁴¹Pu(n_th,f) reaction