ANALYSES OF TOTAL REACTION CROSS SECTIONS FOR LIGHT EXOTIC NUCLEI ON THE BASIS OF THE S-MATRIX APPROACH

A.S. Molev

Abstract
Approximate expression for the light radioactive nucleus total reaction cross section at intermediate energy is obtained on the basis of the model representation of the scattering matrix. Total reaction cross sections for ^9, 11Li and ^7, 12, 14Ве calculated with the use of this expression agree with the exact values mainly within about 1 - 2%. It is shown that reaction cross section for the ¹¹Li + ¹²С system decreses with increasing energy in the energy range E = 20 - 75 MeV/nucleon due to decrease of radius parameter and increase of tranparency at small angular momenta with the energy of the incident nuclei.

KEY WORDS: total reaction cross section, scattering matrix, quasielastic scattering, neutron-rich nuclei, neutron halo.

CONSTRUCTION OF GAUGE-INVARIANT FULL AMPLITUDE IN ELECTROMAGNETIC PROCESSES

Yu.A. Kasatkin, I.K. Kirichenko, S.A. Soldatov

Abstract
Is rotined, that the absence of a Lagrangian adequate a bound system does not allow "to include" electromagnetic (EM) a field by a standard image - by elongation derivative. In activity the procedure of the count EM of a field at a level of a full covariant matrix element is offered, that provides precise preservation EM of a current answering disorder of a compound nuclear system on components. This method is equivalent to some dynamic gauge transformation.

KEY WORDS: gauge invariance, coupled systems, amplitude, covariance.

DISPERSION OF CHARGED PARTICLES IN SUPERCONDUCTIVE MAGNETIC CIRCUITS

V.M. Rashkovan, A.V. Marchuk, I.A. Ponomaryova

Abstract
Equation of the deflection angle of charged particles in superconducting circuits was determined and its dependence on the parameters of the problem was also defined. Energy transition in the system "charged particle-superconducting circuit" and the magnetic field magnitude variation were investigated. Appearance of the induced electric field and its influence on a moving particle were carefully analyzed. The obtained results were based on the introduction of the Rauss function for the proper system and the obtainment of integrals for charged particle motion.

KEY WORDS: superconducting circuit, Rauss function, deflection angle, magnetic field.

THERMODYNAMICS LOCAL QUASIEQUILIBRIUM STATE IN THE QUASI-PARTICLE GAS

V.F. Aleksin, N.R. Belyaev, V.D. Khodusov

Abstract
Meanings of thermodynamic values, describing local quasiequilibrium state as function drift speed, local temperature and chemical potential in gases quasi-paticle, are received: phonons in dielectrics and magnons in ferrodielectrics.

KEY WORDS: phonon, magnon, thermodynamic values, drift speed, local temperature, chemical potential.

DISSIPATIVALESS TRANSITION OF PULSE MAGNETIC FIELD IN 1D ANISOTROPIC SPIN XY-CHAIN

Yu.V. Sereda

Abstract
The evolution of unidimensional spin XY - chain, which possesses the fermian character of elementary excitations, with certain condition for exchange interaction constants under the influence of strong short pulse of a magnetic field has been studied. Namely, the possibility of selfinduced transparency effect for magnetic field pulse in a magnet was studied. As a result, the uniparametric soliton solution of exact system of equations for the studied antiferromagnet in the external magnetic field is found. Thus, the characteristics of pulse, which is able to pass through the given spin system without dissipations, don't changing it's state, are obtained. The case of background stationary homogeneous magnetic field is considered.

KEY WORDS: XY - chain, antiferromagnet, selfinduced transparency, soliton.

STABILITY OF THE IDEAL SMALL-SCALE MHD MODES IN TOKAMAK

E.V. Romashenko, A.Ya. Omel'chenko

Abstract
In the framework of the ideal magnetohydrodynamic theory, the stability of the ideal small-scale MHD modes has been investigated allowing for effect of finite Larmor radius in anisotropic plasma of a tokamak with a ripple magnetic field. On the basis of numerical analysis the excitation zones of Mercier modes and ideal ballooning modes, them growth rates have been obtained.

KEY WORDS: ripple magnetic field, anisotropic plasma, effect of finite Larmor radius, Mercier modes, ideal ballooning modes.

PHYSICAL MECHANISMS OF GENERATION OF SUB- AND UPPER HARMONICS IN A PERIODIC PLASMA-FILLED WAVEGUIDE SYSTEM

A.V. Kirichok, V.M. Kuklin, S.T. Mouharov

Abstract
The influence of plasma filling on electrodynamic characteristics of a periodic waveguide system is studied. It is considered the physical mechanisms, leading to appearance of subharmonics and upper harmonics of the main mode, which cause the transition to non-stationary regimes of instability of a monoenergetic electron beam.

KEY WORDS: periodic waveguide, hybrid systems, nonlinear mechanisms, beam-plasma interaction.

NONSYMMETRIC ELECTROMAGNETIC WAVES IN SLIGHTLY NONUNIFORM MAGNETOACTIVE PLASMA, THAT PARTIALLY FILLED METALL WAVEGUIDE

N.A. Azarenkov, V.F. Klepikov, V.P. Olefir, A.E. Sporov

Abstract
The influence of thickness of vacuum gap between metal waveguide wall and plasma column on the dispersion, spatial field structure and collisional damping of nonpotential electromagnetic waves is considered in this paper. Considered waves propagate along cylindrical waveguide structure that consists of metal waveguide partially filled by slightly heterogeneous in axial direction plasma. External steady magnetic field is directed along the axis of waveguide system. Plasma is considered in hydrodynamic approximation as cold, radially uniform media. It is shown, that the dispersion properties, wave field radial structure and wave damping essentially determined by the thickness of vacuum gap and by the external magnetic field value. The investigations have shown that due to varying of vacuum gap thickness it is possible to control the wave electrodynamic characteristics and, as a consequence, the parameters of gas discharge that is sustained by that waves.

KEY WORDS: nonsymmetric electromagnetic wave, waveguide structure, nonuniform plasma, dispersion properties, damping decrement, gas discharge.

PARAMETRIC EXCITATION OF SURFACE WAVES AT INTERFACE BETWEEN NONUNIFORM PLASMA AND VACUUM

N.A. Azarenkov, V.K. Galaydych

Abstract
This paper is devoted to the investigation of the linear stage of decay instability of electromagnetic wave which is scinned in plasma. This instability leads to the excitation of two surface waves. The thickness of a transitional sheath on the boundary of plasma with vacuum is assumed to be small. The expressions for instability increment and nonlinear frequency shift are obtained with account for the strong field increase in the plasma resonance points. The account of a nonlinear shift of frequency leads to the stabilization of considered instability. For a symmetric decay the nonlinear shift of frequency is equal to zero. The component to a threshold of instability has the second order of a smallness.

KEY WORDS: inhomogeneous plasma, electromagnetic wave, surface wave, parametric instability, plasma resonance.

METHODS OF SIMULATION OF NPP ACCIDENT RADIATION FIELDS.
1. ACCIDENT RADIATION CHARACTERISTICS

A.V. Lisitsky, S.A. Pismenesky, V.G. Rudychev

Abstract
In the present paper profound analysis of g-radiation spectra which are typical for various accident condition on nuclear objects are carried out. Correct recreation of the radiations is important problem in studing the radiations effect on the equipment and personnel of the objects as well as in desinging and testing special shield constractions. The authors have obtained charecteristics of g-radiation source for several scenario of accident evolution on the NPP with VVER-1000 and have proposed the sources classification.

KEY WORDS: accident, g-radiation, nuclides, activity, spectrum.

SPECIFIC HEAT AND PHONON SPECTRA OF HIGH-TEMPERATURE SUPERCONDUCTORS ReBa₂Cu₃ O_7-d (Re = Y, Dy, Eu)

I.N. Kudryavtsev

Abstract
The phonon specific heat functions for high-teniperature superconductors (HTS) Re-Ba-Cu-O (Re = Y, Dy, Eu) are calculated in the framework of united theoretical approach, accounting for the phonon dispersion and characteristic dimensionality of lattice vibrations. Agreement of theoretical calculations with the corresponding experimental data is achieved in wide temperature region. Characteristic frequencies of the phonon spectrum are determined and electronic specific heat contribution is educed that allows to accomplish a detailed analysis of electron-phonon interaction peculiarities and their role in carrier coupling for cuprate HTS.

KEY WORDS: specific heat of Re-Ba-Cu-O HTS, rare-earth elements substitution, phonon density of states, electronic subsystem, specific heat jump, superconductivity.

PECULIARITIES OF THE ACTION OF HIGH-CURRENT TUBULAR RELATIVISTIC ELECTRON BEAMS UPON SOLIDS

V.F. Klepikov, A.G. Ponomarev, G.V. Skachek, A.G. Tolstolutskiy, V.V. Uvarov

Abstract
The paper considers peculiarities of the action of relativistic electron beams of microsecond duration upon targets with different atomic weights. Stages of development of gas-plasma torch at the spot of beam-target contact are studied. It has been shown that tubular beams can increase pressure upon target as compared to the continuous ones, provided the target thickness is not smaller than the beam diameter.

KEY WORDS: relativistic electron beams, ultrahigh pressures, gas-plasma torch.

PERSPECTIVE TECHNOLOGICAL APPLICATIONS OF ELECTRON BEAMS IN ROLLED STEEL PRODUCTION

Yu.I. Gofman, A.I. Kirdin, T.A. Kovalenko, I.V. Mizik , S.A. Pismenesky

Abstract
The technological application potentialities of thin sheet steel treatment by relativistic electron intensive beams were studied. The results obtained by radiation thermal treatment (RTT) of low-carbon and electrotechnical steels indicate RTT high effectiveness. It is shown RTT accelerates recrystallization annealing of low-carbon steels, raises magnetic induction and decreases specific losses of electrotechnical steels. RTT can be used for production of electrotechnic steels with combined texture and composition material of metall-polymer-metall type with sound absorber high characterictics.

KEY WORDS: relativistic electrons, radiation thermal treatment, thin sheet steel, recrystallization, combined texture, composition material.

HIGH-EFFECTIVE TECHNOLOGY OF GATE'S OXIDATION OF LARGE SCALE INTEGRATED CIRCUITS

S.P. Novosiadly

Abstract
At this work results of investigations of influence of technological factors of gate's oxidations on the electrophysical parameters of oxides and stability of interphase boundary of Si-SiO₂ by making up of LSI circuits' structures have been presented.

KEY WORDS: gate, oxidation, defects, durability, charge.

THERMOELECTROTRAINING AND RADIATION STABILITY HOMOPOLAR INTEGRAL PATTERNS

N.M. Pelykhatiy, N.I. Kovalenko, T.C. Plahtiy, A.K. Ghnap

Abstract
The results on stability augmentation of homopolar silicon patterns are adduced at the expense of preliminary effect of electrical and thermal fields. The saturation of effect came at four - seven day of preliminary thermo - field effect. The reduction of time and amplitude of a handicap in a switched circuit is watched also.

KEY WORDS: thermoelectrotraining, integrated circuit, bipolar patterns, homopolar patterns, threshold pressure, leakage current, handicap.

DESIGN OF WEAR-PROOF COATINGS ON THE BASIS OF CEMENTED CARBIDES HIGH-MELTING EUTECTIC COMPOSITIONS

V.A. Сhishkala, S.V. Lytovchenko, Ye.P. Nechiporenko, D.S. Matvienko, T.S. Maslova, T.M. Hyzhnyak, V.I. Gritsenko, D.V. Ocheretny

Abstract
The capability of wear-proof coatings design on steels on the basis of high-melting compositions was studied. The results of research of technology factors influence on a structural - phase characteristics of coatings and their properties are adduced.

KEY WORDS: protective coatings, wear resistance, structural - phase transformation, carbides, borides, cemented carbides, composites.

THE INVESTIGATION OF MIGRATION AND SEGREGATION OF INTERMETALLIC PARTICLES IN ZIRCONIUM ALLOYS FOR NUCLEAR REACTORS

V.G. Kirichenko, P.L. Rudenko, A.I. Snurnikova

Abstract
The results of the research of dynamics of migration and segregation intermetallic inclusions with Fe phases in Zr alloys are presented in this work. The segregation on the surface layer due to effective interaction of the phases inclusions with the grain boundaries is developed. The rise of concentration of Fe-intermetallides in surface layers of zirconium alloys is connected with growth intermetallids particles, fast particles diffusion under grain boundaries and increase of crystalline perfection of intermetallic phases under ageing of deformed alloys.

KEY WORDS: zirconium alloys, intermetallic phases, conversion electron Mossbauer spectroscopy (CEMS), diffusion, migration, segregation, surface.

ROTATION-ISOMERIC RELAXATION IN SOME BRANCHED HYDROCARBON

A.A. Asheko, V.S. Sperkach

Abstract
The analysis of acoustic spectrum of saturated branched hydrocarbons showed that frequency dependence of sound absorption can be described by equation with one or two relaxation times. Low frequency region of acoustic relaxation in considered objects is caused by isomer-rotation transformation. The mechanisms of isomer-rotation transformation are considered. The kinetic and thermodynamic parameters of isomer-rotation transformation are determined.

KEY WORDS: acoustic absorption, sound propagation velocity, acoustic relaxation, relaxation power.

MODIFIED PLASMA SOURCE OF ELECTRONS

V.N. Borisko, A.V. Maslow, A.A. Petrushenya, I.A. Rudaya

Abstract
In this paper the possibility of increasing efficiency of extraction of electron beams from wide-aperture pening source of electrons was experimentally investigated. The optimal values of external parameters of the source and methods of controlling of electron beams by changing a difference of potentials between cathodes were determined.

KEY WORDS: electron, plasma, drift instability, discharge.

THE PROJECT OF THE HIGH-VOLTAGE MULTIPHASE TRANSFORMER ACCELERATOR OF THE CHARGED PARTICLES

G.A. Krivonosov, D.S. Melnikov, N.V. Naidyonov, N.A. Khizhniak

Abstract
The high-voltage multiphase transformer accelerator of charged particles is considered in this project. It contains the potential screen, under which the equipment for feeding of the source of charged particles is placed, the accelerating tube, the high-voltage multiphase transformer with rectifier, and the high-voltage divider. To reduce of mass and size parameters and to increase of efficiency with multiphase high-frequency (3 - 7 kHz) converter of electrical energy.

KEY WORDS: the multiphase high-voltage transformer, accelerating tube, source of the charged particles.