PARAMETRIZATION OF THE OPTICAL POTENTIALS FOR ELASTIC SCATERING OF THE LOW ENERGY DEUTERONS BY ⁹BE

V.D. Sarana

Full Text :   (1040 kB, Rus.) 

Abstract
It is consider characteristic property of parameterization of the phenomenological optical potentials for elastic scattering of a low energy deuterons by ⁹Be with simultaneously account of the differential cross section and VAP by the spherical optical model. Some lines of the parameterization are considering in detail. It is obtain that in region of the low energy the spin-orbital interaction may be important. It is shown that there are some problem connected with the location of the large interference minimum at low energy scattering deuterons on ⁹Be and his description in frame of being parameterizations of the optical parameters at simultaneously account of the differential cross section and VAP.

KEY WORDS: elastic scattering deuterons, beryllium, optical model, potential parameterization.

DESCRIPTION OF ELASTIC SCATTERING AND QUASIELASTIC CHARGE-EXCHANGE REACTION OF ³HE ON CARBON NUCLEI IN THE S-MATRIX MODEL WITH REGGE POLES

A.V. Kuznichenko, G.M. Onyshchenko, V.V. Pilipenko , N. Burtebaev

Full Text :   (560 kB, Rus.) 

Abstract
A generalization of the phenomenological S-matrix model taking into account individualized Regge poles has been proposed to describe simultaneously the refraction effects in the cross sections of elastic scattering and quasielastic charge-exchange reactions of light ions on nuclei. The cross sections of elastic ³He scattering and quasielastic (³He,³H) reaction with excitation of isobaric analogs of the target-nucleus ground states on ¹⁴С nuclei at 72 MeV and on ¹³С nuclei at 72 and 39,6 MeV has been analyzed. It has been shown that th model proposed allows satisfactory description of the cases of elastic scattering and charge-exchange reactions under consideration, reproducing correctly the refraction Airy-structures and anomalous large-angle scattering effect.

KEY WORDS: light ions, charge-exchange reactions, refraction effects, S-matrix, Regge poles.

UNITARY AND NON-UNITARY STATES IN A SUPERPOSITION OF SINGLET AND TRIPLET PAIRING IN A SUPERFLUID TWO-COMPONENT FERMI LIQUID

S. Shulga, A. Yatsenko

Full Text :   (310 kB, Rus.) 

Abstract
By the example of a symmetrical nuclear matter, a possibility of a simultaneous co-existence of Cooper pairs with singlet and triplet pairing in a two-component Fermi liquid is considered. It is supposed that the common spin of pairs is equal to zero and the common isospin is equal to one. With using the Fermi liquid approach and the Skyrme's model of interaction, the self-consistent equations for the order parameter and their one and two-gap solutions are obtained. The Skyrme forces at which considered states are possible are listed and conditions to density of the system are indicated. The solutions for the case of unitary states are considered separately.

KEY WORDS: Fermi liquid, superfluidity, nuclear matter, singlet, triplet states, unitary states.

ELECTROMAGNETIC PROPERTIES OF DEUTERON INCLUDING MESONS EXCHANGE

Yu.A. Kasatkin, V.F. Klepikov

Full Text :   (340 kB, Rus.) 

Abstract
The translations in momentum and charging spaces allows to take into account in amplitude of elastic electron scattering on the deuteron in one-photon approach contributions meson currents. The received amplitude in the balanced image takes into account contributions, that one-particles - nucleonic mechanisms, and multiparticles - due to a derivative from vertex function of strong interaction. The effective account mesonic sector defines the top border of size of his contribution in elastic form factors of deuteron, which is possible at the direct account mesonic current with attraction of Feynman diagrams.

KEY WORDS: vertex function, elastic form factors, mesons exchange current, deuteron's beam, electronuclear power.

COMBINED IMPLEMENTATION OF NUMERICAL AND ANALYTICAL METHODS FOR INVESTIGATIONS OF QUANTUM CHAOS IN SMOOTH POTENTIALS OF COMPLICATED GEOMETRY

V.A. Cherkaskiy

Full Text :   (2010 kB, Rus.) 

Abstract
The paper presents brief review of the basic types of computational problems, arising in investigations of quantum chaos signatures in certain physical models - energy spectrum determination, stationary wave functions calculation, simulation of wave packets time evolution. Author analyses advantages, disadvantages and specifics of application of certain numerical and analytical methods for solution of similar problems - matrix diagonalization and spectral methods for solution of Schrodinger equation, different spectrum unfolding methods and others. Advantages of spectral method compared to matrix diagonalization were demonstrated and explained.

KEY WORDS: quantum chaos, numerical methods, semiclassical approach.

MASS TRANSFER AND CONSECUTIVE HETEROGENEOUS REACTIONS IN WELL MIXED SYSTEMS

P.O. Mchedlov-Petrossyan, G.A. Khomenko, D. Kopiychenko

Full Text :   (380 kB, Rus.) 

Abstract
The dynamics of concentration changing in well-mixed systems with two consecutive heterogeneous reactions on the surface of monodisperse aerosol particles is analyzed in case of mass transfer limitation. Self-consistent set of equations was obtained. All possible variants of concentration changing were classified. Initial concentrations and mass transfer coefficients which lead to these variants were defined. It is shown that number of possible switches increases from one as in case of one binary reaction to two due to reaction consecutiveness. Analytical solution for the case of double switch was obtained.

KEY WORDS: heterogeneous reaction, aerosol particle, switch, consecutive reaction.

BOUNDARY LAYER INSTABILITY OF SHEAR VISCOUS STREAMS

L.S. Rozumenko, V.I. Tkachenko

Full Text :   (390 kB, Rus.) 

Abstract
In this work the conditions of appearance and development of shift Kelvin - Helmholtz instability on a boundary of two viscous streams with different properties and different rates of movement are investigated. It's shown, that the account of viscosity influences on a value of a critical velocity (exceeding what causes the development of instability) and results in appearance of dissipative instability. The character of open instability in conditions of three-waves interaction has been investigated and it has been established, that the instability is of an explosive character.

KEY WORDS: viscous stream, dissipative instability, explosive instability, boundary, critical velocity.

¹¹⁵In AND ¹¹³In ISOMERS PHOTOEXCITATION TO ENERGY 3.0 MeV

О.S. Shevchenko, A.N. Dovbnya, Yu.N. Ranyuk, A.A. Nemashkalo, I.G. Goncharov, V.N. Borisenko, V.I. Noga, I.I. Shapoval, E.L. Kuplennikov

Full Text :   (260 kB, Rus.) 

Abstract
The yield of isomeric states in ¹¹⁵In and ¹¹³In produced by the (γ,γ') reaction have been measured in the bremsstrahlung with end point energy range of 1.0-3.0 MeV by activation method and integrated photoactivation cross sections for some intermediate states has been deduced. The integrated cross sections results are analyzed in combination with data from low-energy photon scattering (γ,γ') reaction. It was shown, that ^115mIn and ^113mIn yields are sharply grow up at the end point energy range of 1600-3000 keV and that it probably connecte with existence of intensive activating levels at the energy of 1999 and 2420 for ¹¹⁵In and 1802 and 2378 keV for ¹¹³In.

KEY WORDS: isomers photoproduction, indium-115, indium-113, bremsstrahlung irradiation, germanium-lithium gamma detector, electrostatic accelerator.

THE INFLUENCE OF NONEQUILIBRIUM FLUCTUATIONS ON PLASTIC DEFORMATION OF METALS UNDER IRRADIATION

V.I. Dubinko, V.F. Klepikov

Full Text :   (290 kB, Rus.) 

Abstract
New mechanism is proposed for the enhancement of plasticity of metals under irradiation. The mechanism is based on the nonequilibrium fluctuations of energy states of the dislocation atoms due to scattering of radiation-induced excitations of atomic or electronic structure of metals. Scattering of radiation-induced focusing collisions at dislocation is argued to assist the dislocation in overcoming local obstacles. As a result, the plastic strain rate increases by the value, which does not depend on temperature and is proportional to irradiation flux. The proposed mechanism enhances the plasticity of metals under sub-threshold irradiation. Under over-threshold irradiation, the plasticity increase is usually shadowed by the radiation- induced hardening due to radiation-induced formation of additional defects, which increase the level of internal stresse

KEY WORDS: plastic strain, nonequilibrium fluctuations, irradiation, focusons, plasmons.

MIGRATION OF THE INCLUSIONS OF INTERMETALLIDES IN Zr-Fe⁵⁷ ALLOYS

V.G. Kirichenko, A.I. Kirdin

Full Text :   (1140 kB, Rus.) 

Abstract
By using Conversion Electron Mossbauer Spectroscopy on Fe⁵⁷ atoms in back scattering registration geometry the investigation of structure and phase composition of intermetallides in subsurface layers (0.3 μm thickness) of alloy Zr-Fe⁵⁷ on the zirconium base at the initial and annealed state is carried out. On the base of our experimental and literature data the 3D- diagram of С - δ - Δ (concentration - isomer shift - quadrupole splitting) is formed. At the initial state the composition heterogeneity of intermetallic inclusions phase is discovered. The nanocrystalline particles mobility of the ferrous containing intermetallic inclusions in temperature gradient direction to alloy surface under isochronous thermal aging at temperature range 570-1070K is investigated. At the condition of Fe atoms high mobility the final formation of Zr₃Fe crystalline phase is occurred under isochronous aging at 370-970К.

KEY WORDS: zirconium alloys, intermetallic inclusions, migration, concentration, isomeric displacement, quadrupole splitting.

ELECTRON BEAM PRODUCTION IN COAXIAL GEOMETRY SECONDARY-EMISSION SOURCE WITH SEGMENTED CATHODE

N.I. Ayzatskiy, A.N. Dovbnya, V.V. Zakutin, N.G. Reshetnyak, N.A. Dovbnya, T.A. Kovalenko

Full Text :   (410 kB, Rus.) 

Abstract
It is shown generation possibility of electron beams in magnetron guns with secondary-emission cathodes with not uniform distribution azimuth electrical field. Electrical cloud near external surface of segments is electron source. Effect of electron storage in fields with reduced electrical field at secondary-electron generation in limited fields of cathode segments is discovered.

KEY WORDS: electron beam, secondary emission source, magnetron gun, segmented cathode.

NONDESTRUCTIVE CONTROL OF THE BURNABLE ABSORBER IN MATERIALS AND PRODUCTS FOR NUCLEAR POWER

O.P. Omelnyk, V.V. Levenets, A.O. Shchur

Full Text :   (560 kB, Rus) 

Abstract
This article demonstrates the possibilities of analytical installations developed in NSC KIPT for control of burnable absorbers on basis of gadolinium. The technique is developed for elemental content control of burning out UО₂-Gd₂О₃ fuel using the method of X-ray fluorescence with excitation by X-ray tube on small-sized installation of the multielemental analysis "ELEAN-2". The installation is developed and technique is checked for simultaneous nondestructive control of surface density of fuel cladding and concentration of the absorbing element gadolinium entered into a fuel cladding. This installation uses the methods of X-ray radiometry and X-ray fluorescence with excitation of X-ray emission by a radioisotope source.

KEY WORDS: gadolinium, uranium, burnable absorber, characteristic X-ray emission, K-, L-series, surface density.

KINETICS OF VOID FORMATION IN THE THIN NIOBIUM FILMS UNDER LOW TEMPERATURE DEPOSITION

I.G. Marchenko

Full Text :   (340 kB, Rus.) 

Abstract
The processes of void formation at a low temperature deposition in the niobium films are studied by the method of molecular dynamics. It is shown, that the vacancies situated in films not chaotic. They are forming the vacancies clusters, which are situated under micro cracks on the films surface. The change of cluster size distribution under the time is studied. It is shown, that the increase of the deposition time leads to the increasing of cluster size. The change of the vacancy concentration in the films thick is investigated.

KEY WORDS: films, vacuum deposition, simulation, niobium, vacancy.

ION-CYCLOTRON INSTABILITIES OF MAGNETIC-FIELD-ALIGNED PLASMA FLOW WITH TRANSVERSE VELOSITY SHEAR

V.S. Mikhailenko, D.V. Chibisov

Full Text :   (230 kB, Rus.) 

Abstract
The ion cyclotron instabilities in magnetic-field-aligned plasma flow with transverse velocity shear are investigated. The instabilities are caused by the transverse to magnetic field velocity shear. When the velocity shear exceeds threshold value the hydrodynamic ion cyclotron instability develops in plasma. Below that given threshold two branches of the kinetic ion cyclotron instability in plasma are possible. One of them is a modification of the ion cyclotron instability of plasma with parallel current. The cause of the second instability branch is a transverse to magnetic field velocity shear. That instability excites even in the currentless magnetic-field-aligned shear flow. The energy density in the saturation state of the ion cyclotron instabilities is obtained.

KEY WORDS: magnetic-field-aligned plasma shear flow, ion cyclotron instability, transverse to magnetic field velocity shear.

MATHEMATICAL MODEL FOR NUMERICAL ANALYSIS OF EIGEN TM WAVES IN COAXIAL GYROTRON WITH THE CORRUGATED INSERT

A. S. Kononenko

Full Text :   (280 kB, Rus.) 

Abstract
Coaxial gyrotron with a corrugated insert is considered. Rigorous mathematical model has been built for such a wave-guide in the case of TM. Discrete mathematical model is built on its basis by means of the method of discrete singularities. Simulation software which allows to perform full-wave spectral analysis for the cavity gyrotrons in the case of TM modes has been developed. Results of the numerical investigations are presented and their reliability is analyzed.

KEY WORDS: coaxial cavity gyrotron, method of discrete singularities, ТМ waves in the gyrotron.

ELECTRONUCLEAR POWER INDUSTRY: RESEARCH AND DEVELOPMENT TRENDS. ANALYSIS OF INIS AND SCOPUS DATA BASES

V.F. Klepikov, V.Yu. Korda, A.G. Shepelev, A.S. Molev, L.P. Korda, O.V. Nemashkalo, T.A. Ponomarenko, L.D. Yurchenko

Full Text :   (230 kB, Rus.) 

Abstract
Being aimed at determining the international trends of research and development of the electronuclear (accelerator driven) systems for safe nuclear power production and nuclear waste transmutation, we have analyzed the content of about 4000 records, associated with the problem under study, found in two complete International Data Bases: "International Nuclear Information System" (INIS) and multisubject SCOPUS. We have observed a dramatic increase in number of various publications devoted to the problem. This study makes us able to claim the importance, availability and necessity of developing electronuclear (accelerator driven) technologies in Ukraine.

KEY WORDS: electronuclear systems, accelerator driven systems, subcritical assembles, energy amplifiers, transmutation, nuclear wastes.

USE OF STATISTICAL PHYSICS METHODS TO INVESTIGATE THE ECONOMICAL PRODUCTION SYSTEMS WITH REPETITION PRODUCTION

V.P. Demutsky, O.M. Pignasty, V.D. Khodusov, M.N. Azarenkova

Full Text :   (320 kB, Rus.) 

Abstract
A mathematical model of mass production dynamics in engineering is constructed. The state of production system at any moment is given by a point in two-dimensional phase space. Distribution function for base product is introduced and the equation for this function is written. There is the analogy of kinetic equation in physics. The engineering-production and generative functions are defined. The equations for disturbance state of closed system of the state equations for macroscopic parameters of produced system are received. The stability conditions of function of produced system are written. The such interconnection between the surplus and the temp of moving of basic products along the technological chain which guarantees the stability of produced process function to be shown.

KEY WORDS: synergetic, basic product, macroscopic description, distribution function, engineering-production function, generative function, equations of balance.

THE NUMERICAL SIMULATION OF THE ELECTRIC-SPARK ELASTIC-PULSE GENERATOR OPERATION INTO A WATER-FILLED WELL

V.I. Fedun, Y.E. Kolyada

Full Text :   (220 kB, Rus.) 

Abstract
The self-consistent problem of an electric-spark discharge evolution into the water-filled well have been numerically solved. There are carried out and well grounded a set of equations which describes the basic physical phenomena in this system. Their solutions allowed to define a steam-gas cavity dynamics and the parameters of an excited acoustic pulse into a liquid. It is found that a steam-gas cavity dynamics in a system with a cylindrical geometry and the excited pulse parameters diverged considerable at an identical energy characteristics from such parameters that have be realized at an electric spark generator operation in infinite matter. The control ways of an emitted pulse pressure amplitude have been indicated.

KEY WORDS: acoustic pulse, electric-spark discharge, water-filled well, numerical simulation, steam-gas cavity, pressure.

CONDUCTING PROPERTIES OF YBa₂Cu_3-yAl_yO_7-хSINGLE CRYSTALS WITH UNIDIRECTIONAL TWIN BOUNDARIES

M.A. Obolenskii, R.V. Vovk, A.V. Bondarenko

Full Text :   (320 kB, Ukr.) 

Abstract
In present work the method of synthesis and conductivity of YBa₂Cu_3-yAl_yO_7-х single crystals in the normal and superconductivity state are investigated. The Al admixtures are the effective scattering centers of normal carriers. Temperature dependence of fluctuation conductivity near-by Т_c satisfactorily described by the Aslamazov-Larkin theoretical model. At the same time, the partial replacement Cu on Al results in considerable expansion of region of surplus conductivity. It can be confirmation on possible existence of admixture phase with higher critical temperature.

KEY WORDS: fluctuation conductivity, adding, YВaCuO single crystals, high temperature superconductivity, crossover, length of coherent.