No abstract available

[en] A microscopic optical nucleon-nucleus potential constructed on the basis of calculating the mass operator for the single-particle Green’s function with Skyrme nucleon-nucleon forces was used to study the effect of the tensor part of Skyrme forces on describing differential cross sections for elastic nucleon-nucleus scattering and the structure of nuclei within a self-consistent approach. It was shown that an increase in the tensor terms of nucleon-nucleon forces impaired the description of nucleon-nucleus scattering within the model being considered. The parameters of Skyrme forces were optimized on the basis of an analysis of cross sections for neutron-nucleus scattering, the properties of nuclear matter and the structure of nuclei being tested in doing this. This optimization led to nucleon-nucleon force versions where the tensor part was small or zero and which described satisfactorily the structure of nuclei and cross sections for elastic neutron and proton scattering on nuclei over a broad range of target mass numbers.

[en] A comprehensive study was made of the electrical, superconducting, and structural properties of indium thin films obtained by condensation on a substrate cooled with liquid helium. Structural electron diffraction analysis made it possible to refine the general law governing the annealing processes occurring when the cold-deposited films are warmed up. The annealing of indium films to about 80--100 ⁰K is found to entail an irreversible growth of the interplanar separations owing to a reduction of the inhomogeneous microstresses. When the films are warmed from 100 to 300 ⁰K the main annealing processes are determined by the growth of crystallites and the appearance of a predominant orientation in them. The variation of the residual resistance and of T_c as the cold-deposited films are warmed is explained on the basis of the structural data obtained. In particular, a direct relation is established between the crystallite size and the value of T_c

[en] A model of a deuteron-nucleus (dA) optical potential is developed. The real and imaginary parts of this potential were determined from the calculation of the mass operator in the respective Green’s function by perturbation theory on the basis of effective nuclear-density-dependent nucleon-nucleon (NN) Skyrme forces and with allowance for the rearrangement potential. Radial and energy dependences of various components of the dA potential were studied in the calculations with various versions of Skyrme forces. The presentmodel was applied to analyzing differential cross sections for elastic deuteron scattering on nuclei over a broad range of mass numbers at various energies and total cross sections for dA reactions. A reasonable description of respective experimental data was obtained.

[en] The deterministic approach for describing the phenomenon of self-sustained regime of nuclear burning wave in a fast critical reactor is developed. The results of calculations of the space-time evolution of neutron flux and the fuel burn-up in such a system are presented. (authors)

[en] There are 4 NPP working in Ukraine now, which used 13 WWER-1000 and 2 WWER-440 nuclear power units with total installed capacity of 13,835 MW

[en] The possibility of constructing such new versions of effective nucleon-nucleon forces that would make it possible to describe simultaneously the cross sections for nucleon-nucleus scattering and quantities characterizing nuclear matter and the structure of finite even-even nuclei is investigated on the basis of a microscopic nucleon-nucleus optical potential that is calculated by using effective Skyrme interaction. A procedure for optimizing the parameters of Skyrme forces by employing fits to specific angular distributions for neutron-nucleus scattering and by simultaneously testing the features of nuclear matter, the binding energy of the target nucleus, and its proton root-mean-square radius is proposed. A number of versions of modified Skyrme forces that ensure a reasonable description of both nucleon-nucleus scattering and the properties of nuclear structure are found on the basis of this procedure.

[en] A generalization of the phenomenological S-matrix model taking into account isolated Regge poles is proposed for simultaneously describing refractive effects in the cross sections for the elastic and inelastic scattering of light nuclei. The cross sections for elastic α + ²⁴Mg scattering are analyzed at energies of 50, 54, 65.7, 81, and 119 MeV. The analysis of the cross sections for elastic scattering is supplemented with an analysis of the inelastic scattering of alpha particles that is accompanied by the excitation of the first excited state (2⁺) of ²⁴Mg nuclei. It is shown that the proposed model makes it possible to describe satisfactorily all of the aforementioned cases of elastic and inelastic scattering, correctly reproducing the refraction Airy structures and anomalous large-angle scattering that are observed at large scattering angles

[en] The presentation provides information about nuclear fuel reproduction and the U-Pu fuel cycle; the history of the Breed and Burn concept and the traveling wave concept; the non-stationary theory of nuclear burning wave; the Nuclear Burning Wave in Fast Reactor with U-Pu Fuel; nuclear burning wave in 5m length cylindrical FR for different reactor radius R and about the Reactor Power Control by Reflector Efficiency

[en] Main features of NBW reactor with mixed Th-U-Pu fule cycle: Reactor composition (vol. frac.): Fuel = 55% (F_Th = 62%, p = 0.80), Coolant = 30%, CM = 15%, R = 215 cm: - negative feedback on reactivity - intrinsic safety; - long-term (decades) operation without refueling and external control; - possibility of ²³²Th and ²³⁸U utilization as a fuel; - fuel burn-up depth for both ²³⁸U and ²³²Th ≈ 50%; - neutron flux in active zone ≈ 2·10¹⁵ n/cm²s; - neutron fluence during the whole reactor campaign ≈ 3·1024 n/cm²; - energy production density in active zone ≈ 200 W/cm³; - total power at the steady-state regime ≈ 1.2 GW; - wave velocity at the steady-state regime ≈ 2 cm/year; - possibility of nuclear waste burn out (expected)