The Journal of Kharkov National University, Vol. 859,
Physical series "NUCLEI, PARTICLES, FIELDS", Issue 2 /42/, 2009
| V.A. Tsymbal, N.D.Masalitin, S.A. Pismenetskiy, V.G. Rudychev, Y.V. Rudychev, A.F.Stoyanov
The calculation of 9Be(d,n)10B neutron source characteristics at ED < 2,5  Ìev (Rus.)
| Yu.M. Poluektov
On the theory of a non-linear neutral scalar field with spontaneously broken symmetry (Rus.)
| V.G. Kirichenko, V.I. Tkachenko, T.A. Kovalenko, P.L. Rudenko, M.S. Vasylenko
The investigation of interaction of superconducting objects with low magnetic fields
| O.V. Kuklina, V.M. Kuklin
On the relative role of the phonon spectrum and the collisional relaxation in processes of generation and scattering (Rus.)
| D.D. Burdeinyi, V.B. Ganenko, Yu.P. Peresunko, I.M. Shapoval, G.A. Vashchenko
Analyzing power of the high energy photon polarimeters based on processes pair and triplet photoproduction
| Ì. Ì. Pylypenko
Construction materials for the elements of equipment of nuclear-power plants (Rus.)
| N.A. Azarenkov, Zh.S. Kononenko
Numerical study of first orbit losses of trapped particles in TOKAMAKS
| A.A. Stupka
Sound modes in isotropic magnetic hydrodynamics (Rus.)
| A.V. Pochynok, V.T. Lazurik, A.F. Tseluyko, E.V. Borgun
The computer processing of the plasma ultraviolet source characteristics of the measurements results (Rus.)
| A.V. Lisitsky, S.A. Pismenesky, V.G. Rudychev
Simulation of ventilated container of storage by linac bremsstrahlung (Rus.)
| N.V. Alekseechkin
Generalization of the Kolmogorov-Johnson-Mehl-Avrami theory to the case of growth law of diffusional type (Rus.)
| À.D. Pogrebnjak, V.M. Beresnev, S.N. Bratushka, L.V. Malikov
Elemental and phase composition of titanium alloys VT-22 implanted by ions W+ and Mo+ (Rus.)
| D.G. Malykhin, V.V. Kornyeyeva
Application of X-ray pattern oF difdaction on dislocation in analysis of strains in polycrystalline materials (Rus.)
| N.P. Dikiy, E.P. Medvedeva, I.D. Fedorets, N.P. Khlapova, N.S. Lutsay
Structure and magnetic properties of gamma activated nanoparticles of magnetite (Rus.)
| V.G. Kirichenko, E.S. Melnikova
The features of formation and simulation of graphite monoatomic layers (Rus.)
| N.D. Kharchenko, V.A. Lisovskiy
Low pressure gas breakdown in combined electric fields (Rus.)
| A.A. Zavgorodniy, R.V. Vovk, M.A. Obolenskii, A.V. Samoylov
Effect of high pressure on temperature dependence of the pseudogap in slightly oxygen doped YBa2Cu3O7-δ single crystals (Ukr.)
THE CALCULATION OF 9Be(d,n)10B NEUTRON SOURCE CHARACTERISTICS AT Ed < 2,5 ÌEV
V.A. Tsymbal, N.D.Masalitin, S.A. Pismenetskiy, V.G. Rudychev, Y.V. Rudychev, A.F.Stoyanov
Full Text : (402 kB, Rus.)
There are summarized some relevant nuclear data and weighted means have been obtained for the cross-section of the 9Be(d,n)10B reaction at (0.5-3)MeV. With some model bringing in the expressions have been obtained for the neutron spectra from the thick target up to 2.5MeV deuteron energy. The dependence is calculated of the total reaction yield, which is similar to known
earlier, but decreases the expected value of yield to (7..11) times in the energy region Åd =1.5-2 MeV. These spectra and angular distributions of outgoing neutrons so as a total reaction yield can be used to design the compact neutron irradiator, in particular, for producing of short-live radioactive nuclides for therapy directly near the places of their application.
KEY WORDS: Neutron, deuteron, beryllium, neutron generator, neutron spectra.
ANALYZING POWER OF THE HIGH ENERGY PHOTON POLARIMETERS BASED ON PROCESSES PAIR AND TRIPLET PHOTOPRODUCTION
D.D. Burdeinyi, V.B. Ganenko, Yu.P. Peresunko, I.M. Shapoval, G.A. Vashchenko
Full Text : (1195 kB, Rus.)
In the work it is considered influence of experimental factors on analyzing power processes of e+e—-pairs photoproduction in the field of nuclei and atomic electrons (triplet photoproduction), which can be used for measurement the linearly polarizations of photon beams in the energy range 30-3000 ÌeV. Modeling has shown that analyzing power of both
processes does not practically depend on initial photon energy in the interval under study and can reach Λ~0.11 when there is no applied any selection of the events. The analyzing power of the processes can be increased up to Λ~0.2 at the e+e—-pairs selection with close energies of electron and positron, or in the case of triplet photoproduction, if the recoil electron selection near the border of kinematically permitted region is used.
KEY WORDS: analyzing power, photon polarimeter, linear polarization, photoproduction e+e—-pair, triplet photoproduction, recoil electrons, δ-electrons, symmetric pairs.
ELEMENTAL AND PHASE COMPOSITION OF TITANIUM ALLOYS VT-22 IMPLANTED BY IONS W+ AND MO+
À.D. Pogrebnjak, V.M. Beresnev, S.N. Bratushka, L.V. Malikov
Full Text : (475 kB, Rus.)
With the help of methods of back-scattering (RBS) of helium ions and protons, scanning electron microscopy (SEM) with a microanalysis EDS, WDS, X-ray phase analysis (XRD) in geometry of sliding beam (0.5°), Möossbauer spectroscopy (MS), nanoindentation were investigated samples of titanium alloys VT-22. The increase of hardness almost in 2 times, decreasing of wearing and increase of fatigue resistance is revealed due to formation of fine-dyspersated (nanodimension) intermetallide phases.
KEY WORDS: double implantion, nanohardness, types of distributing of elements, phase composition.
APPLICATION OF X-RAY PATTERN OF DIFDACTION ON DISLOCATION IN ANALYSIS OF STRAINS IN POLYCRYSTALLINE MATERIALS
D.G. Malykhin, V.V. Kornyeyeva
Full Text : (290 kB, Rus.)
A brief analysis of problems of X-ray studies of microstructure characteristics, in particular microscopic strains of polycrystalline materials is carried out. A place in this area of X-ray
investigations of developing dislocation conception of abnormal strains distribution is defined. A conformity of the dislocation pattern of diffraction on strains with the formalism of Voigt
function techniques namely with using of Cauchy function is found. The physical sense of Cauchy function describing of strains distributions is explaining. Taking in account of arbitrary
orientations of Burgers vectors of edge dislocations is made. The formula of dislocation density determination is corrected with taking into account of Burgers vectors disorientations.
KEY WORDS: X-ray analysis, diffraction, strains, dislocations, pattern, calculation, approximation, Voigt function, Cauchy function, anisotropy
STRUCTURE AND MAGNETIC PROPERTIES OF GAMMA ACTIVATED NANOPARTICLES OF MAGNETITE
N.P. Dikiy, E.P. Medvedeva, I.D. Fedorets, N.P. Khlapova, N.S. Lutsay
Full Text : (265 kB, Rus.)
Activation of nanoparticles of magnetite is carried out by slowing-down γ - radiation on high-current electronic accelerator in NSC KIPT at energy of electrons 22 MeV and a current 500 μÀ. The comparative analysis of component-phase structure and state of crystal structure of activated and initial nanomagnetite was carried out by X-ray diffractometry and IR - spectroscopy methods. The magnetic properties of samples were investigated by magnetometric method. Radiative transformations have been analysed and it was shown that there
were no essential changes in structure and properties of nanomagnetite. Activated nanoparticles of magnetite keep monophase state and crystallinity of initial state and have high level of saturation magnetization (Ms ~ 74 À×m2/kg), so they predetermine possibility of their usage as a magnetically operated radiopharmpreparation.
KEY WORDS: nanomagnetite, electron accelerator, gamma-activation, X-ray diffractometry, IR- spectroscopy, magnetometry, radiopharmpreparation
LOW PRESSURE GAS BREAKDOWN IN COMBINED ELECTRIC FIELDS
N.D. Kharchenko, V.A. Lisovskiy
Full Text : (776 kB, Rus.)
In this work by analogy to the three modes of the combined (RF+DC) discharges existence, we distinguish the ignition of the combined discharges also in three modes: 1) RF breakdown
perturbed by the DC electric field, 2) breakdown in the combined field, 3) DC breakdown perturbed by the RF electric field. It is shown that application of the DC voltage combined with
the RF first increases the RF breakdown voltage compared to the breakdown voltage of self-sustained RF discharge. However at sufficiently high DC voltages the DC field starts to
contribute to the ionization of gas molecules, RF breakdown voltage goes down with the increasing of the DC voltage applied to the combined discharge and equals to zero, when the self-
sustained DC discharge ignites. The DC breakdown curve, influenced by the RF voltages higher than the minimum RF breakdown voltage Urf.min, consists of two parts.
KEY WORDS: combined discharge, RF capacitively coupled discharge, DC discharge, gas breakdown, low pressure discharge, nitrogen, argon.
EFFECT OF HIGH PRESSURE ON TEMPERATURE DEPENDENCE OF THE PSEUDOGAP IN SLIGHTLY OXYGEN DOPED YBa2Cu3O7-δ   SINGLE CRYSTALS
A.A. Zavgorodniy, R.V. Vovk, M.A. Obolenskii, A.V. Samoylov
Full Text : (300 kB, Rus.)
In present work the effect of high pressure on conductivity in the base plane of oxygen deficient YBa2Cu3O7-δ single crystals was investigated. The excess conductivity Δσ(Ò) for the
YBa2Cu3O7-δ single crystals shows exponential dependence in the wide temperature range Tf<Ò<T*. In addition ratio Δσ~(1-Ò/Ò*)exp(Δ*ab/T) can be interpreted in the mean field theory, where Ò* represents as mean field temperature of superconducting transition and temperature dependence of the pseudogap can be described satisfastionaraly in term of crossover BSC-BEK theory. The increase of the enclosed pressure brings narrowing over of temperature interval of realization of the PG-mode to the effect, the same, extending the region of linear dependence ρ(Ò) in ab-plane.
KEY WORDS: excess conductivity, hydrostatical pressure, YÂaCuO single crystals, high temperature superconductivity, crossover, pseudogap state.