The use of accelerator-produced spallation neutrons to transmute actinide and long-lived fission-products portends a means to alleviate requirements for deepgeological disposal. The accelerator performance, targetblanket physics, chemical-processing requirements, and overall systems engineering are closely coupled in determining the economic incentives for the Accelerator Transmutation of Waste...

For more than 20 years, the OECD Nuclear Energy Agency (NEA) has been conducting international studies related to the partitioning and transmutation (P&T) of nuclear waste, including physics, chemistry and material issues, as well as fuel cycle and radioactive waste management strategies. The information exchange meetings on actinide and fission product partitioning and transmutation, organised...

[AnX(3)](2)(μ-η(2):η(2)-N(2)) (An = Th-Pu; X = F, Cl, Br, Me, H, OPh) have been studied using relativistic density functional theory. Geometric and vibrational data suggest that metal→N(2) charge transfer maximises at the protactinium systems, which feature the longest N-N bonds and the smallest σ(N-N), as a result of partial population of the N-N π* orbitals. There is very strong correlation o...

Molecular plating is widely used for the deposition of lanthanide and actinide compounds on thin metallic backing foils [1]. At GSI and UMZ, this method has been previously applied on Ti or Be foils. Within the requirements of the TASCA-Project (TransActinide Separator and Chemistry Apparatus) very thin foils of Al (2-10μ m) as backing material have been proposed [2]. The general usability of v...

The electronic spectra of the 5f(2) isoelectronic actinide compounds U(4+), NpO(2)(+), and PuO(2)(2+) have been investigated theoretically both in gas phase and in solution. In the latter case the solvent was modelled by a saturated first hydration sphere, five water molecules for NpO(2)(+), and PuO(2)(2+) and eight for U(4+), and a continuum model describing the remaining solvent. The transiti...

Results of the experimental project using ne| ive muon spin rotation at Lawrence Berkeley Laboratory are reported. The following ave been discussed briefly, i) The bound muon g factors from the viewpoints of the relativistic and nuclear polarization effects, ii) Strange depolarization phenomena in terms of the difference between the muonic-atom probe and its equivalent nuclear probe iii) Applic...

We solve the time-dependent Dirac equation for a muon which is initially bound to a fissioning actinide nucleus. The computations are carried out on a 3-D cartesian lattice utilizing the Basis-Spline collocation method. The muon dynamics is sensitive to the nuclear energy dissipation between the outer fission barrier and the scission point. From a comparison with experimental data we find a dis...