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  1. Fundamental properties of actinide materials

    Actinides, the backbone of nuclear fission technologies, find applications in many strategic fields, from space exploration to medical diagnostic and treatments. However, due to the risk associated with their radio-toxicity, it is necessary to carry out r ...

    30 April 2014

  2. 3.4. Research and Development of Thorium in Nuclear Fuel-European Commission

    Article presenting results of neutronic assessments of the use of thorium fuel in current commercial PWR without modification of core and assembly characteristics performed within an INPRO thorium fuel cycles (ThFC) study. Thorium fuel cycles (ThFCs) have ...

    30 April 2014

  3. Fragment properties from fission of actinide nuclei induced by 6-10 MeV bremsstrahlung

    A JRC contribution to a conference presents the results from experiments on fission fragment mass and total kinetic energy distributions from 234,238U along with preliminary data from an on-going investigation of angular distributions from 234U(gamma, f). ...

    30 April 2014

  4. High-Pressure Resistivity Studies of Selected f-electron Compounds- Pressure Tuning of the f-electron Interactions

    Physical properties of the light actinide materials, i.e. those containing Pa, U, Np or Pu, are strongly influenced by their 5f-electron states which are not fully localized in the atomic core but also partly hybridize with the conduction band. In additio ...

    30 April 2014

  5. Self-irradiation Induced Structural Changes in the Transplutonium Pyrochlores An2Zr2O7 (An=Am, Cf)

    We have pursued the fundamental chemistry of actinide pyrochlore oxides, An2Zr2O7 (An-Am, Cm, Bk, and Cf), using X-ray diffraction as well as optical spectroscopy. One recent facet of our studies has been to observe the structural changes of these materia ...

    30 April 2014

  6. Renewed Interest in Lead Cooled Fast Reactors

    In the last few years a number of compact designs of lead-alloy cooled systems have been promoted. Moreover, in Russia a design effort was started earlier on the pure lead-cooled BREST reactor but this effort does not appear to be strongly funded any more ...

    30 April 2014

  7. Fast Neutron Irradiation Impact on Thermophysical Properties of Inert Materials Intended As Support Matrix for Transmutation Targets Bearing Minor Actinides

    This paper contains the results of density, lattice parameter, microstructure, thermal diffusivity and specific heat measurements performed on three neutron irradiated inert matrices: MgO, AI2O3 and MgaiO* The irradiation was carried out in Phenix as part ...

    30 April 2014

  8. Exhaustive electrolysis for recovery of actinides from molten LiCl-KCl using solid aluminium cathodes

    An electrorefining process in molten chloride salts using solid aluminium cathodes is being developed in ITU in order to separate actinides (An) from spent nuclear fuel. In this process, the fuel including fission products (FP) are co-dissolved into an el ...

    30 April 2014

  9. Radiation effects in actinide compounds with the fluorite structure

    Radiation damage in actinide compounds with the fluorite structure and especially on UO2 and (U, Pu)O2 has been extensively studied for more than 50 years in view of the better understanding of the behavior of these materials as fuel for nuclear power rea ...

    30 April 2014

  10. How accurate are electronic structure methods for actinoid chemistry?

    The CASPT2, CCSD, and CCSD(T) levels of wave function theory and seven density functionals were tested against experiment for predicting the ionization potentials and bond dissociation energies of actinoid monoxides and dioxides with their cations. The go ...

    30 April 2014

  11. Study of Photon Strength Function of Actinides: the Case of 235U, 238Np and 241Pu

    The decay from excited levels in medium and heavy nuclei can be described in a statistical approach by means of Photon Strength Functions and Level Density distributions. The study of electromagnetic cascades following neutron capture based on the use of ...

    30 April 2014

  12. Fission Cross-Section Measurements of 233U, 245Cm and 241,243Am at CERN n_TOF Facility

    Neutron-induced fission cross-sections of minor actinides have been measured using the n_TOF white neutron source at CERN, Geneva, as part of a large experimental program aiming at collecting new data relevant for nuclear astrophysics and for the design o ...

    30 April 2014

  13. Triclinic-Cubic Phase Transition and Negative Expansion in the Actinide IV (Th, U, Np, Pu) Diphosphates

    The AnP2O7 diphosphates (An = Th, U, Np, Pu) have been synthesized by various routes depending on the stability of the AnIV cation and its suitability for the unusual octahedral environment. Synchrotron and X-ray diffraction, thermal analysis, Raman spect ...

    30 April 2014

  14. Synthesis route for the safe production of targets for transmutation of plutonium and minor actinides

    Composites of actinide oxides dispersed in a Mo metal matrix is a recent inert matrix fuel (IMF) concept for the transmutation of Pu and the minor actinides (MA = Np, Am, Cm). These elements are present in spent nuclear fuel, and their long term radiotoxi ...

    30 April 2014

  15. Neutron-induced fission cross section of 245Cm: New results from data taken at the time-of-flight facility n TOF

    The neutron-induced fission cross-section of 245Cm was measured at n_TOF in a wide energy range and with high resolution. The energy dependence, measured for the first time in a single measurement from thermal to 1 MeV neutron energy, has been determined ...

    30 April 2014

  16. Theoretical study of bond distances and dissociation energies of actinide oxides AnO and AnO2

    In the present study we evaluated trends in the bond distances and dissociation energies of actinide oxides AnO and AnO2 (An = Th- Lr) on the basis of consistent computed data obtained by using density functional theory in conjunction with relativistic sm ...

    30 April 2014

  17. Theoretical study of the Pu and Am dicarbide molecules

    The electronic structure and ground-state molecular properties of Pu and Am dicarbides were investigated by relativistic multireference calculations using CASSCF/CASPT2 theory. The electronic ground state in both molecules corresponds to a symmetric trian ...

    30 April 2014

  18. The Actinides Elements: Properties and Characteristics

    In this chapter, the properties of the actinide (5f) elements are discussed. These elements are unstableand undergo radioactive decay. Because handling them is complex and their availability is limited, it is difficult to experimentally investigate their ...

    30 April 2014

  19. Optimising BTP ligands by tuning their basicity

    A novel approach for the optimisation of extractants for the actinide(III)/lanthanide(III) separation is presented. Two BTP ligands are synthesised carrying OMe or Cl moieties on the pyridine ring, thus altering the electronic structure of the aromatic sy ...

    30 April 2014

  20. Negative Thermal Expansion and Antiferromagnetism in the Actinide Oxypnictide NpFeAsO

    A neptunium analog of the LaFeAsO tetragonal layered compound has been synthesized and characterized by a variety of experimental techniques. The occurrence of long-range magnetic order below a critical temperature TN = 57 K is suggested by anomalies in t ...

    30 April 2014

  21. Sub-barrier resonance fission and its effects on fission fragment properties

    The correlation between the sub-barrier resonant behaviour of fission cross-section of non-fissile actinides (pre-scission stage) and the visible fluctuations of their fission fragment and prompt neutron data (post-scission stage) around the incident ener ...

    30 April 2014

  22. Resonant Elastic X-Ray Scattering from 5f Systems

    The first REXS experiments on a uranium compound at the U M4 edge (3,728 keV) took place at BNL twenty years ago. An enormous enhancement of the scattering intensity was found. Since that time many other systems have been examined. This paper reviews some ...

    30 April 2014

  23. Reaction cross-sections, fission yields and prompt neutron emission from actinide targets

    A thorough understanding of the fission process for actinides is becoming an important necessity for the modelling of innovative concepts for radioactive waste minimisation based on either accelerator driven systems or fast reactors, e.g. Generation IV sy ...

    30 April 2014

  24. Artificial diamonds as radiation-hard detectors for ultra-fast fission-fragment timing

    In the framework of the construction of the double time-of-flight spectrometer VERDI, where we aim at measuring pre- and post-neutron masses directly and simultaneously, ultra-fast time pick-up detectors based on artificial diamond material were investiga ...

    30 April 2014

  25. Thermodynamic and Thermophysical Properties of the Actinide Carbides

    Physico-chemical properties of actinide carbides are reviewed thoroughly. The different metal? carbon systems are analyzed one by one, starting from the temperature vs. composition phase diagram. The most important ternary systems, including oxide- and ni ...

    30 April 2014