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Journal Articles

The Joint evaluated fission and fusion nuclear data library, JEFF-3.3

Plompen, A. J. M.*; Cabellos, O.*; De Saint Jean, C.*; Fleming, M.*; Algora, A.*; Angelone, M.*; Archier, P.*; Bauge, E.*; Bersillon, O.*; Blokhin, A.*; et al.

European Physical Journal A, 56(7), p.181_1 - 181_108, 2020/07

 Times Cited Count:73 Percentile:99.41(Physics, Nuclear)

The Joint Evaluated Fission and Fusion nuclear data library 3.3 is described. New evaluations for neutron-induced interactions with the major actinides $$^{235}$$U, $$^{238}$$U and $$^{239}$$Pu, on $$^{241}$$Am and $$^{23}$$Na, $$^{59}$$Ni, Cr, Cu, Zr, Cd, Hf, W, Au, Pb and Bi are presented. It includes new fission yileds, prompt fission neutron spectra and average number of neutrons per fission. In addition, new data for radioactive decay, thermal neutron scattering, gamma-ray emission, neutron activation, delayed neutrons and displacement damage are presented. JEFF-3.3 was complemented by files from the TENDL project. The libraries for photon, proton, deuteron, triton, helion and alpha-particle induced reactions are from TENDL-2017. The demands for uncertainty quantification in modeling led to many new covariance data. A comparison between results from model calculations using the JEFF-3.3 library and those from benchmark experiments for criticality, delayed neutron yields, shielding and decay heat, reveals that JEFF-3.3 is excellent for a wide range of nuclear technology applications, in particular nuclear energy.

Journal Articles

EXILL; A High-efficiency, high-resolution setup for $$gamma$$-spectroscopy at an intense cold neutron beam facility

Jentschel, M.*; Blanc, A.*; de France, G.*; K$"o$ster, U.*; Leoni, S.*; Mutti, P.*; Simpson, G.*; Soldner, T.*; Ur, C.*; Urban, W.*; et al.

Journal of Instrumentation (Internet), 12(11), p.P11003_1 - P11003_33, 2017/11

 Times Cited Count:27 Percentile:86.8(Instruments & Instrumentation)

Oral presentation

Extension of fission reaction model FIFRELIN for wider reaction conditions and post processing

Ogawa, Tatsuhiko; Litaize, O.*; Mancusi, D.*; Chebboubi, A.*; Serot, O.*

no journal, , 

The Monte-Carlo code FIFRELIN was originally developed for the simulation of first chance fissions of fissile nuclei. In case of neutron-induced fissions, the compound nucleus always fissioned from an exited state whose excitation energy is sum of the incoming neutron energy and the neutron binding energy. While in the new version, with the multi-chance fission algorithm, the fissioning nuclei can start from higher exited states considering the competition of fission reactions, neutron emission, and gamma emission. When fission is selected in the competition, the partitioning of mass, charge, excitation energy, and angular momentum to the two fission fragments is determined either by the FIFRELIN native algorithm or by GEF. In fission reactions induced by energetic neutrons, pre-fission particle emission reduces the excitation energy of the compound nucleus before fission, leading to a noticeable difference of the final observables such as neutron multiplicity and fission product mass distribution. The other updated feature is the interface to codes handling the post-reaction processes. The energy spectra of neutrons, electrons and photons from fission reactions are output in a format compatible with PHITS, a general-purpose particle transport code. By using this functionality, one can simulate the transport and reactions of particles based on the cross section data and reaction models of PHITS, and the spectra calculated by FIFRELIN. Finally, the other interface developed in this study is nuclide yield output in a format compatible with DCHAIN-SP2014, a burn-up calculation code. This interface is necessary to consider the build-up, which depends on the time structure of the incoming neutron beam as well as the decay during the cooling period.

Oral presentation

Simulation of $$^{235}$$U(n,fission) gamma-ray energy spectrum by FIFRELIN fission event generator

Ogawa, Tatsuhiko; Litaize, O.*; Mancusi, D.*; Chebboubi, A.*; Serot, O.*

no journal, , 

The gamma-ray spectrum of $$^{235}$$U(n,fission) reactions measured by Makii et al., at PF1B cold-neutron beam facility at the Institut Laue Langevin (ILL) in Grenoble (France) was compared with the data calculated by the fission event generator FIFRELIN to get the insight into the mechanisms which determine the gamma-ray energy spectrum. The features structures of the spectrum, a bump at 4 MeV, a shoulder at 6 MeV agreed between experiment and calculation while the shape of the tail beyond 10 MeV did not agree well. The bump around 4 MeV is mostly attributed to the deexcitation of closed shell nuclei such as Sn-132 from their excited state around 4 MeV to their ground state. The shoulder near 6 MeV is explained by the fact that the neutron separation energy of most of fission fragments are around 6 MeV. The excitation energy of fragments is randomly distributed, therefore the fragments with excitation energy higher than the neutron separation energy favor neutron emission, whereas those with low excitation energy emit gamma-rays. Consequently, gamma-ray spectrum drops around 6 MeV. According to FIFRELIN, gamma-rays above 10 MeV are mainly from fragments with mass below 90. Meanwhile, the multiplicity of gamma-rays from the fragments with mass lower than 90 was overestimated according to the FIFRELIN previous results. Therefore reducing the multiplicity of gamma-rays from fragments with mass below 90 can explain both discrepancies. We show in this work that by increasing the spin cut-off parameter of fragments with mass lower than 90 by a factor of 5, FIFRELIN reproduced the measured gamma multiplicity mass dependence as well as the measured gamma-ray energy spectrum.

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