I. NUCLEAR PHYSICS

The integral cross sections of nuclear and Coulomb interactions of the and hypernuclei with different atomic nuclei in the framework of two-cluster ( , ) and three-cluster (, ) models are calculated and investigated depending on hypernuclear structure, nuclear edge diffusseness of target nucleus and multiple scattering.

The isovector dipole excitations in spherical nuclei are considered within a kinetic-theory approach, which explicitly exploits the effective nuclear surface as a collective variable. It is shown that the surface symmetry potential plays an essential role in the structure of the giant dipole resonance. It is found, that the obtained strength distribution is in the agreement with the experimental one, when both volume and surface interactions are included simultaneously.

3. Quasistationary state of the weakly-bound particle in the external electric field

Close expression for the interior wave function of the weakly-bound particle in the external electrical field has been obtained. The approximate analytical representation of these functions was founded. It is shown that in the electrical field of heavy nuclei the interior stationary state of weakly-bound particle is transformed in the quasi-stationary one (the particle polarization or break up). It leads to significant distorting of interior wave functions. It has been shown that the spherical symmetry of this function is broken even as particle moves to the force source.

In the framework of molecular dynamics neutron scattering on α-target was considered. Trial wavefunction was chosen in a way that allowed to treat complete break-up of α-particle. Dependencies of the energy, transmitted to α-particle after the collision, on the energy and impact parameter of incident particle were obtained. The total crossection of complete disintegration of α-particle and the reaction time were estimated.

The elastic scattering of the middle energy neutrons by atomic nuclei has been chosen to demonstrate the fruitfulness of the stochastic modification of the diffraction model. The parameter of nuclear density that determines the radius of average field potential is a random variable in this approach. One may expect to take thus approximately into account the discrete structure of nuclear matter when diffraction model is used. The experimental data on the elastic differential cross-sections have been compared with the results of calculations.

6. INVESTIGATION OF THE ENERGY DEPENDENCE OF THE RADIUS OF THE REAL PART OF THE OPTICAL POTENTIAL

N. L. Doroshko, I. E. Kashuba

A new interpretation of the energy dependence of the radius of the optical potential is proposed. This method is based on an investigation of time delay of a particle scattering at its interaction with a nucleus of a target in case of the small quantities of partial dissipated waves and low (Е £ 50 MeV) energy for the spherical nuclei ²⁰⁸Pb. Within the framework of the designed approach the analysis of the influence of a bound and virtual states of a nucleus on energy dependence to the radius of the optical potential is carried out.

7. THE INVESTIGATION OF THE PROPERTIES OF ⁹⁷Ru IN THE FRAMEWORK OF DYNAMIC COLLECTIVE MODEL

The energies, spins, parities, magnetic dipole and electric quadrupole moments, spectroscopic factors of the ground and excited states of ⁹⁷Ru as well as the reduced probabilities of electromagnetic transitions between them have been calculated in the framework of the dynamic collective model. The reduced probabilities of -transitions between main state of ⁹⁷Rh and excited states of ⁹⁷Ru have been calculated. Theoretical results were compared with experimental values.

8. Investigation of the first excited level decay OF ⁶Не with a + t interaction

The decay of an excited state 2⁺ of ⁶Не formed in the reaction ³H (a, p) ⁶He^*, at E_a= 27,2 MeV was experimentally investigated. The matrices of p-a coincidences and spectra of a-particles from the decay of a state 2⁺ of ⁶Нe for six pairs of angles of protons and a- particles were received.

9. THE INVESTIGATION OF PENETRATION EFFECTS FOR L-FORBIDDEN TRANSITION IN ¹²¹Sb

The internal conversion coefficients (ICC) of the K-shell of number of g-transitions were measured with high accuracy from ¹²¹Sb decay by the technique of g- and K_X-spectroscopy, which is equal to a_К= 9,94 ± 0,12. Penetration parameters of M1-transitions between states with Dl = 2 were calculated on the basis of obtained data. l =-3,3 ± 0,8 for g37 keV.

10. mechanism of neutron scattering on barium nuclei. in 0,5 – 15 mev energy range

I. A. Korzh, N. T. Sklyar, T. I. Yakowenko

Our data and data of other authors on total, integral and differential elastic and inelastic cross sections of neutron scattering in 0,5 - 15 MeV energy range for barium nuclei of natural isotope composition, as well as for ^{136, 138}Ba isotopes are analyzed. Optical statistical approach based on optical model, coupled channel method and modern versions of statistical model is used. Possibility of an adequate description of all experimental data in frames of this approach, even using averaged values of optical parameters is shown, and this permitted to evaluate the contribution of direct and compound mechanisms of fast neutron scattering by researched nuclei.

O. A. Bessheyko, V. A. Zheltonozhskiy, I. N. Kadenko, A. A. Levchenko, I. B. Mihnitzkiy, L. V. Sadovnikov, N. V. Strilchuk

Our research group fulfilled measurements of relative output fragments activities of ²³²Th fotofission by g-quanta with boundary energies 22 MeV. As the results of experiments, in spectra activities of isomeric pairs ^117m,gIn, ^135m,gXe and feeding radionuclide were discovered. At first these researches allow to measure quantities of s_m/s_g for these fragments, which were founded equal for ¹¹⁷In s_m/s_g = 1,3 ± 0,4 and for ¹³⁵Xe s_m/s_g = 0,66 ± 0,09. We define quantities of medium angular moments for ¹¹⁷In =7,5 and for ¹³⁵Xe = 4,5.

12. EMISSION OF NEAR-ZERO-ENERGY ELECTRONS FROM THE SURFACE OF SOLID STATE IN RADIOACTIVE DECAY OR UNDER BOMBARDMENT BY CHARGED PARTICLES

The main characteristics of emission of near-zero-energy electrons е₀ from surface of solid state received by the different authors in experiment are considered. The existing ideas about the nature of this phenomenon are discussed. Our explanation of е₀-electrons emission is the stress off of electrons from surface caused by a sudden splash of a charge near to the surface of source in radioactive decay or under bombardment of target by charged particles. The emission е₀- of electrons is considered at different modes of radioactive decay and in nuclear reactions.

13. THE POSSIBILITY OF BORON NEUTRON CAPTURE THERAPY OF MALIGNANT TUMORS AT KIEV RESEARCH NUCLEAR REACTOR

The possibility of neutron source design for boron neutron capture therapy (BNCT) at Kyiv research nuclear reactor is analyzed. It is necessary to rebuild the thermal column for construction of such a source. The basic features of proposed reconstruction are presented. In accordance with estimation, in respect to its parameters the source will meet the requirements of BNCT on a level of the best sources existing or planned abroad. Proposed reequipment of the thermal column has no influence upon safe functioning of the reactor. Appearance of the proposed neutron source will set up the conditions for developing the center of malignant tumor therapy on the base of Kyiv research reactor.

14. DEVELOPMENT OF MATERIAL TO PROTECT FEATURES AGAINST X-RAYS IRRADIATION

S. I. Azarov, O. V. Babich

Ecologically pure materials for protection against x-rays irradiation, in which mix of elements with high atomic number is used as a filler, is offered. The complete set of articles for protection against x-rays irradiation, reducing irradiation dose rate 30 times is prepared based of this material and optimization of construction.

A. P. Trofimenko, Zh. I. Pysanko

Psychological features of nuclear power public perception, reasons of anti-nuclear movement and social components of its participants are considered. The results of some public opinion polls on nuclear power are analyzed, and factors, which influence on opinion, are discussed. Arguments are presented which indicate that part population imagination about nuclear power hazard is strongly exaggerated.

A system of superconducting inclusions, which are immersed in a dielectric matrix has been studied. In the assumption that inclusion radius is less or order of coherence length a critical magnetic field of spherical isolated inclusion was determined. A temperature dependence of conductivity and conductivity as a function of magnetic field for a crystal with superconducting inclusions has been calculated. In the calculations the assumption was made that inclusion concentration is insufficient for onset of superconductivity in a whole sample (i.e. below threshold of percolation). It was shown that the presence of superconducting inclusions leads to the sharp increasing of conductivity of a sample at low temperatures, and to strong dependence of conductivity upon the magnetic field (magnetoresistance). Magnetoresistance is caused by superconductivity suppression in inclusions with increasing magnetic field. The influence of dispersion of inclusion sizes on the conductivity as a function of temperature and of magnetic field have been studied.

17. ACCURACY OF COORDINATE DETERMINATION OF HIGH-ENERGY CHARGED PARTICLES BY SILICON STRIP DETECTORS

I. E. Anokhin, O. S. Zinets

The coordinate determination accuracy of minimum ionizing and short–range particles by silicon strip detector has been considered. The charge collection on neighboring strips of detector is studied and the influence of diffusion and the electric field distribution on accuracy are analyzed. It has been shown that coordinates both minimum ionizing and short–range particles can be determined with an accuracy to a few microns using silicon strip detectors.

18. STRUCTURAL AND ELECROOPTICAL PROPERTIES OF THE SILICON AFTER NEUTRON IRRADIATION AND HIGH TEMPERATURE TREATMENT

M. I. Starchyk, A. A. Groza, L. A. Matveeva, V. I. Varnina, R. Yu. Holiney, P. G. Lytovchenko, G. G Shmatko

The process of the defect formation, supporting oxide precipitation after neutron irradiation (10¹⁵ - 10¹⁹ n/cm²) and high temperature treatment (800 - 1000 °C) of Cz silicon wafers was investigated by the transmission electron microscopy. The influence of defect transformation on electrooptical silicon properties were studied.

19. PECULIARITIES of conductivity dose dependences of the PREVIOUSLY IRRADIATED SEMICONDUCTORS ON an EXAMPLE of INDIUM ANTIMONIDE, IRRADIATED WITH PROTONS

First results of investigation of defects formation efficiency in the previously irradiated semiconductors on an example of 47 MeV protons irradiated indium antimonide is given. The conclusion is made, that combination of preliminary irradiation with annealing is expected to become the basis of thermal-radiation technology of semiconductors radiation hardness increasing.

20. THE ELABORATION OF NEW TECHNOLOGICAL SCHEMES OF RADIATION DECONTAMINATION

Elaboration results of new technological scheme of radiation decontamination of infected sewage are given. The double-stage scheme of combined processing of infected sewage is offered. The processes, which take place during the decontamination, are analysed. The installation structure with decontamination capacity up to 20 t flows per day is described.

21. INFLUENCE OF MOLECULAR AND ELECTRONEGATIVE IMPURITIES ON THE CONTRACTION OF AN ARGON ARC AT HIGH PRESSURE

The process of contraction of plasma column of an argon arc at high pressure is considered under the influence of molecular and electronegative impurities. It is shown that the main influence caused by dissociation of molecular impurities in working gas. The results of analytical and numerical calculations is studied in comparison to existed experimental data.

22. STATIONARY SELF-FOCUSING OF WHISTLER WAVES IN THE IONOSPHERE

Possibility of the formation of two-dimensional coherent structures - whistler waveguides - during the active ionospheric experiments is investigated both analytically and numerically. It was shown that the lowest threshold for formation of such waveguides corresponds to wave frequency in the vicinity of the half electron cyclotron frequency. Thermal self-interaction (plasma displacement from the high pressure region and wave beam trapping into the formed channel) plays essential role for formation of the waveguides. To describe appearance and evolution of the stationary channels, the generalization of 2D nonlinear Schrödinger equation was proposed. Stability of two-dimensional structures was proved analytically and numerically.

23. Radioecological assessment of radiological consequences of polluted agrocenosese use

Assessment of radiological consequences of polluted agrocenosese use has been provided. The investigation has been realized on the basis of three-module model of assessment of radiological consequences (EMARC) of polluted agrocenosee use. Model takes into account: - transformation of bio availability of radionuclides and long-term forecast of dynamics of soil-plant transfer factor; features of migration ¹³⁷Cs and ⁹⁰Sr in system soil-plant and natural clean -up of soil, inclusion and migration of radionuclides in food chains and getting into human organism. Calculations were released as a combination of dynamic models and spreadsheet forms in Quattro Pro, version 4 and Lotus 1 - 2 - 3. Estimations were conducted for agrocenosese of Northern Ukraine with six soil types. The obtained results demonstrate the considerable difference among the levels and dynamic formation of committed doses caused by consumption of the polluted food stuffs produced in agrocenosese with different types of soil. This difference can reach for both Cs and Sr one order and more.

24. СONCENTRATION PECULIARITIES OF RADIONUCLIDES BY FRESHWATER MOLLUSCS OF CHERNOBYL NPP EXCLUSION ZONE

D. I. Gudkov, A. B. Nazarov, V. V. Derevets, M. I. Kuzmenko

The results of radionuclides ⁹⁰Sr and ¹³⁷Cs content in molluscs tissue of water objects within Chernobyl NPP exclusion zone has been analysed. The age dynamics of radionuclides content in some species of Gastropoda was studied.

O. L. Zarubin, E. N. Volkova, V. V. Belyaev, Z. O. Shirokaya, V. A. Karapysh

Results of the radioactive contamination of Kanev reservoir ecosystem studies were presented. Data of ⁹⁰Sr and ¹³⁷Cs content in abiotic and biotic components were analysed. ¹³⁷Cs content in aquatic plant depending on space of contact of this hydrobionts with water were analysed. In 2000 ¹³⁷Cs сontent in fish of Kanev reservoir exceeded in 11 times the contents before Сhornobyl accident.

26. EVALUATION OF BIOLOGICAL COMPONENT OF EFFECTIVE ENVIRONMENTAL HALF-LIFE OF ¹³⁷CS IN MOSS COVER

A. A. Orlov, A. B. Kalish

Multiyear dynamics of ¹³⁷Cs content in alive and dead parts of green mosses-dominants of moss layer and also the same index of 0-2-cm layer of soil of forests of authomorphous landscapes have been analyzed. It was found that for all analyzed moss species was specified decrease of ¹³⁷Cs specific activity in alive part and increase in dead part of mosses. Duration of effective environmental half-life for moss cover of authomorphous forests period has been calculated; it varies from 24 years in Pleurozium schreberi, 23,5 years in Hylocomium splendens to 18 years in Dicranum polysetum. Biological half-life was essentially longer in these species – 117,4; 106,3 and 44,6 years accordingly.

27. THE ACUMULATION OF RADIONUCLIDES AND HEAVY METALS BY MUSHROOM’S COMPLEX IN FORESTRY ECOSYSTEMS

Comprehensive studies of the mycobiota contribution to the biogeochemical migration of heavy metals (HM), radionuclides and their stable isotopic and non-isotopic carriers under native conditions have been carried out in contaminated forests of Russia and Ukraine (1988-2000). It was shown that species is a prime factor of ¹³⁷Cs accumulation by the fungi. The so-called "concentrator" group is now clearly represented by Xerocomus badius, Suillus luteus and Tylopilus felleus. ¹³⁷Cs content in the fungus mycelium is close to that in the fruit bodies. No significant difference in ¹³⁷Cs concentration was revealed depending on the fruit body part or age. Spatial variability of ¹³⁷Cs content in the fungi was considerably higher compared to other radionuclides and HM. The contribution of fungus complex to the biogeochemical migration of the various contaminants depends on both the chemical nature of the contaminant and soil-ecological conditions. The contribution is most manifested for ¹³⁷Cs, especially in hydromorphic landscapes (up to 50% of total accumulation in the biota).

E. K. Garger, A. A. Odintsov, A. D. Sajenuk

The solubility of the aerosol "hot" particles selected at Pripyat region in 1987 in simulated lung fluid (SLF - Gamble's or Pinger's solutions) and 0,1 M HCl was studied statistically. The result showed that leaching of the radionuclides in SLF decrease in line ¹³⁷Cs > ⁹⁰Sr >> ^239+240Pu ³ ²⁴¹Am and in 0,1 M HCl ⁹⁰Sr >²⁴¹Am >> ¹³⁷Cs ³ ^239+240Pu. In dissolution experiments with 0,1 M HCl estimated the soluble portion of the ⁹⁰Sr and ²⁴¹Am as 1,4 - 21,0 and 0,9 - 17,0 % correspondingly. In accordance with the size of the "hot" particles 0,01 - 0,4 % ²⁴¹Am and 0,02 - 0,3 % ^239+240Pu were dissolve in the SLF during seven days.

29. LASER-INDUCED FLUORESCENCE OF PINE (NEEDLES) GROWING IN THE CONDITIONS OF POLLUTION WITH RADIONUCLIDS OF CHERNOBYL ORIGIN

E. I. Levchick, E. V. Svarichevslaya, L. V. Skripka, N. D. Kuchma, V. K. Zaika

The results of a long-term research of the spectra of laser-induced fluorescence (hereafter-SF) of pine (needles) growing in the conditions of Chernobyl origin radionuclides pollution are presented. A complex analysis of fluorescent, biometric and radiological biochemical parameters of pine needles has been performed. Changes in the impact of incorporated radionuclides ¹³⁷Cs and ⁹⁰Sr on certain zones of pine SF needles have been detected. It has been shown that the analysis of different-age pine SF needles can be used as a test-method for detection of pollution with ¹³⁷Cs and ⁹⁰Sr radionuclides.