• Aucun résultat trouvé

Fission de l'uranium

Atomic scale investigation of the diffusion of defects and fission gases in uranium dioxide

Atomic scale investigation of the diffusion of defects and fission gases in uranium dioxide

... L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignemen[r] ...

2

GGA+U study of uranium mononitride: A comparison of the U-ramping and occupation matrix schemes and incorporation energies of fission products

GGA+U study of uranium mononitride: A comparison of the U-ramping and occupation matrix schemes and incorporation energies of fission products

... A recent review on the various computational approximations to deal with strong correlations in actinide oxides was carried out by Wen et al. [20] , in which a paragraph was devoted to simulations of uranium ...

7

Development of a detector for the simultaneous measurement and for the study of uranium-233 capture and fission yields at the CERN n_TOF neutron source

Development of a detector for the simultaneous measurement and for the study of uranium-233 capture and fission yields at the CERN n_TOF neutron source

... its fission cross section in the whole energy ...a fission detector to identify the fission events in the calorimeter, making capture-fission discrimination very difficult to perform in the ...

175

Electrochemistry of uranium in molten LiCl-LiF

Electrochemistry of uranium in molten LiCl-LiF

... and fission products (mainly alkali metals and lanthanides) are anodically dissolved in the molten salt while pure uranium metal can be collected on inert cathode [4] ...

10

Electrochemistry of uranium in molten LiF–CaF2

Electrochemistry of uranium in molten LiF–CaF2

... References [1] Actinide and Fission Product Partitioning and Transmutation – Status and Assessment report, OECD-NEA, 1999. < http://www.nea.fr >. [2] L. Cassayre et al., J. Nucl. Mater. 360 (2007) 49–57. [3] ...

7

Caractérisation des fragments de fission et développement du dispositif expérimental FALSTAFF

Caractérisation des fragments de fission et développement du dispositif expérimental FALSTAFF

... la fission En 1938 ...de fission, émettent en moyenne plus d’un neutron, ce qui permet d’induire d’autres réactions de fission : c’est la réaction en ...

230

Resource estimation of in situ leach uranium projects

Resource estimation of in situ leach uranium projects

... Sandstone-type uranium deposits contain approximately 28% of the world uranium ...dissolving uranium minerals directly in their host rocks (in situ) by reactive solutions that are injected through ...

16

Fission, réacteurs, déchets et prospectives (document de 2006)

Fission, réacteurs, déchets et prospectives (document de 2006)

... la fission des actinides, c’est-`a-dire des noyaux lourds situ´es entre l’Actinium (Z=89) et le Nobelium (Z=102) comprenant notamment l’Uranium (Z=92), le Plutonium (Z=94) et le Thorium (Z=90) utilis´es ou ...

476

Electrochemistry of uranium in molten LiF-CaF2

Electrochemistry of uranium in molten LiF-CaF2

... References [1] Actinide and Fission Product Partitioning and Transmutation – Status and Assessment report, OECD-NEA, 1999. < http://www.nea.fr >. [2] L. Cassayre et al., J. Nucl. Mater. 360 (2007) 49–57. [3] ...

8

Advanced concepts for uranium and plutonium multi-recycling

Advanced concepts for uranium and plutonium multi-recycling

... Based on the experience acquired at CEA on these molecules, the mixture of DEHBA (N,N-di-2-ethylhexyl- butanamide) and DEHiBA (N,N-di-2-ethylhexyl- isobutanamide) was selected for the process development [17]. After ...

8

Electrochemistry of uranium in molten LiCl-LiF

Electrochemistry of uranium in molten LiCl-LiF

... and fission products (mainly alkali metals and lanthanides) are anodically dissolved in the molten salt while pure uranium metal can be collected on inert cathode [4] ...

9

Etude des fragments de fission au point de scission avec le modèle SPY

Etude des fragments de fission au point de scission avec le modèle SPY

... de fission obtenus peuvent être corrélés à la structure nucléaire des fragments via leur correction de ...la fission symétrique et la fission asymétrique est interprétée à l’aide de l’évolution des ...

147

Impact of FIFRELIN input parameters on fission observables

Impact of FIFRELIN input parameters on fission observables

... . To be performed a FIFRELIN calculation relies on several models such as gamma strength function and nuclear level density and of more empirical hypothesis such as total excitation energy repartition or angular momentum ...

7

Impact of nuclear inertia momenta on fission observables

Impact of nuclear inertia momenta on fission observables

... 5 Impact on fission observables We now investigate the impact of using the cranking-FRLDM model instead of the usual rigid body prescription. In FIFRELIN, fives parameters must be tuned in order to reproduce ...

7

IMPACT OF WATER RADIOLYSIS ON URANIUM DIOXIDE CORROSION

IMPACT OF WATER RADIOLYSIS ON URANIUM DIOXIDE CORROSION

... corrosion in function of different parameters. Water in contact with UO 2 particles was then irradiated by 4 He 2+ beam at different absorbed doses and under different atmospheres in order to evaluate the effect of H 2 ...

9

Redox reactivity and coordination chemistry of uranium

Redox reactivity and coordination chemistry of uranium

... par un ligand protonné (dbm - ) ce qui a permis d’établir sans ambigüité sa présence en solution grâce à des expériences RMN du proton. Le rôle que joue le ligand qui coordine le cœur uranium oxo/hydroxo dans la ...

278

Assessments of long-term uranium supply availability

Assessments of long-term uranium supply availability

... Additionally, a net-present-value (NPV) analysis was used to model annual uranium exploration investment as a function of historical discovery costs; historical discovery, deve[r] ...

58

Comparative Functional Genomics of the Fission Yeasts

Comparative Functional Genomics of the Fission Yeasts

... Eradication of transposons and reorganization of centromere structure Transposons and other repetitive sequences are thought to be crucial for centromeric function through the maintenance of heterochromatin (6). These ...

18

Uranium and thorium complexes of the phosphaethynolate ion

Uranium and thorium complexes of the phosphaethynolate ion

... scopic data suggest substantial strengthening of the C^P bond upon coordination to the oxophilic actinide centers. The O-coordination of the OCP  fragment is conrmed by X-ray crystallography (Fig. 2-top). Complex 4 ...

7

Caractérisation par nanoindentation du GaN irradié   par des ions uranium de grande énergie

Caractérisation par nanoindentation du GaN irradié par des ions uranium de grande énergie

... R´ esum´ e – Le comportement m´ ecanique de films minces de nitrure de gallium GaN irradi´ es par des ions uranium acc´ el´ er´ es a ´ et´ e ´ etudi´ e par nanoindentation. Les r´ esultats montrent une d´ ...

7

Show all 332 documents...

Sujets connexes