1. POLARIZATION  PHENOMENA  IN  THE  ELASTIC  SCATTERING  OF  PROTONS  ON

⁴He  NUCLEI  AND  ENERGY  DEPENDENCE  OF  p-a  AMPLITUDE  PARAMETERS

Yu. A. Berezhnoy, V. P. Mikhailyuk, V. V. Pilipenko

            The parameterization of the elastic scattering amplitude of protons on ⁴He nuclei was proposed. Energy dependence of the parameters of this amplitude obtained from the comparison of the calculated and measured observable in the elastic p-⁴He scattering was presented. On the basis of the multiple diffraction scattering theory and the α-cluster model with dispersion by using of this parameterization of p-α amplitude the observable in the proton elastic scattering on ¹⁶O nuclei was calculated. The obtained results are in agreement with experimental data.

2. INVESTIGATION  OF  SIMULTANEOUS  EMISSION  OF  TWO  K-ELECTRONS

ON  ^123mTe  NUCLEI

I. N. Vishnevsky,  V. A. Zheltonozhsky,  N. V. Strilchuk,  S. S. Drapey

            Measurements of probability of simultaneous emission of two K-electrons at internal conversion of g-transition with energy 88.5 keV in ^123mTe decay have been carried out. As a result of measurements it was obtained that P_KK  =  (6.6 ± 0.7)×10^–4. It has been shown that direct electron interaction is the main mechanism.

3. ON  THE  EFFECTS  OF  NUCLEAR  STRUCTURE  AND  THE  COULOMB INTERACTION  AT  DIFFRACTION  DEUTERON-NUCLEUS  SCATTERING

V. I. Kovalchuk,  V. K. Tartakovsky,  O. I. Ivanova

            Within diffraction model framework it has been proposed the method of cross section calculation of deuteron-nucleus scattering at intermediate energies. The deuteron wave function was chosen as Hülten one, the Coulomb interaction and nuclear surface diffuseness of targets were taken into account. The calculating cross sections of 700 MeV deuteron elastic scattering from ⁴⁰Са and ⁵⁸Ni satisfactorily fit the experimental data.

4. “SHAKE-OFF”  ELECTRONS  IN  THE  b-DECAY  ¹⁵²Eu

N. F. Mitrokhovich

            Based on measuring of double and triple coincidences g-quants, conversion electrons (СЕ) and        b-particles on different spectrum parts Db with electrons (including the electrons of near-zero energy           e_o-coincidence (g, CE, Db)-(e, e_o) and coincidence gbе_о) the output of “shake-off” electrons is measured per on act b-decay ¹⁵²Eu for parts b-spectrum with energies 77, 125, 300 and 350 keV. Intensity value of “shake-off” electrons (energetic spectrum of “shake-off”-electrons), and also the output of secondly-emissive         e_o-electrons from “shake-off”-electrons on act b-decay is given for these energies. It is proved that               b-particles and “shake-off” electrons evoked by them are strongly correlated in direction of flight, demonstrating predominantly emitting to the same half sphere.

5. INFLUENCE  OF  PARTIAL  NEUTRALIZATION  OF  BUNCH  SPACE  CHARGE  ON DIAGNOSED  PARAMETERS  OF  ION  BEAMS

М. E. Dolinska,  N. L. Doroshko

            The theoretical and numerical analysis of the effect of partial neutralization of beams, as a result of ion bunches capture free electrons, which are formed during the ionization of multicomponent residual gas of the vacuum chamber are performed. Experimental and calculating results for ion beam Ar1⁺ at parameters typical for HF-accelerators are well coordinated.

6. COMPARATIVE  ANALYSIS  OF  PUBLICATIONS  ON  NUCLEAR  FIELD  IN  THE  WORLD,  UKRAINE  AND  IN  THE  INSTITUTE  FOR  NUCLEAR  RESEARCH

OF  THE  NATIONAL  ACADEMY  OF  SCIENCES  OF  UKRAINE

A. P. Trofymenko,  Zh. I. Pysanko,  A. I. Lypska

            Comparative analysis of publications in the world, in Ukraine and in the Institute for Nuclear Research of NAS of Ukraine (INR) in nuclear physics and other directions of INR research was performed. Conclusions about the intensity of research, contrubution of Ukraine in this research and the INR role in it are presented. It is shown that 30 % of Ukrainian publications in nuclear physics, and about 8 % of them in other fields belong to the INR. Part of Ukrainian authors who publish their works in Ukraine and abroad, as well as the part of foreign authors publishing in Ukraine is shown. Distribution of the INR publications among 16 countries is indicated. Ths mentioned information can be used for profound study of research in Ukraine and INR.

7. RESEARCHES  OF  WWER-1000  PRESSURE  VESSEL  IRRADIATION

DEPENDENCE  FROM  NUCLEAR  FUEL  BURN-UP

V. L. Dyemokhin,  O. V. Gritzenko,  V. N. Bukanov,  S. M. Pugach

            To investigate the influence of fissile nuclide concentrations in the core of WWER-1000 type reactor on calculation outcomes of RPV radiation exposure the series of calculational testings were done. The representation of the neutron spectra parameters was carried out under various approximations of the nuclear fuel burn-up accounting down to pin-to-pin at other things being equal. To define the spectra it was applied a specially designed procedure, where the contributions of various fissile nuclide spectra are determined depending on fuel sorts and burn-up depths. It was shown that neutron spectra change due to burn-up is necessary to account under an assembly approximation to determine the radiation exposure correctly.

8. THE  ANALYSIS  OF  THE  DATA  OF  NEUTRON-PHYSICAL  COMPUTATION 

IN  A  CELL  GEOMETRY

V. V. Galchenko,  O. G. Krasnyanskaya,  O. V. Nedyelin,  V. N. Pavlovich,  S. V. Yaroshenko

            The computations of elementary fuel cell by means of the following codes MCNP-4C, SCALE4.4a, SRAC and WIMS-5B with using of different approximations in preparing of constants in resonance area and libraries of neutron-physical constants were made. The obtained data are compared to the result of testing calculation.

9. NEUTRON  BURSTS  AT  NUCLEAR  ACCIDENT  AT  A  FACTORY IN  TOKAI-MURA  (1999)

O. Ya. Vertsimakha,  L. L. Enkovskiy,  V. N. Pavlovych,  S. A. Storozhenko

            The kinetic characteristics of the nuclear incident due to ignition of self-sustaining nuclear chain reaction (SCR) in uranyl nitrate solution were investigated. It was shown that the SCR kinetics has an oscillating form. It was shown that the mechanism of SCR self-damping connected with the decrease of a solution density due to formation of the radiolytic gas bubbles along the tracks of fission fragments. It has been shown also that the subsequent SCR ignition occurs due to solution cooling and leakage of the radiolytic gas. The power of the first SCR pulse and the time between the subsequent bursts were estimated.

10. ENERGY  POSITION  OF  BISTABLE  DEFECT  (C_iC_s)^O  IN “В”  CONFIGURATION  IN  A  FORBIDDEN  ZONE  OF  n-Si

A. P. Dolgolenko,  P. G. Litovchenko,  M. D. Varentsov,  G. P. Gaidar

            Float-zone and phosphorus-doped n-Si samples after irradiation by fast-pile neutrons and subsequent annealing at room temperature were investigated. The calculation of effective concentration of carriers after irradiation was carried out in the framework of Gossick`s model taking into account the recharges of defects both in conducting matrix of n-Si and in the space-charge region of defect clusters. The distribution function of electrons on the acceptor level of bistable defect (C_iC_s)^o when the concentration of this defect is the function of the Fermi level in conducting matrix of n-Si is determined. The concentration of bistable interstitial-carbon-substitutional-carbon pair and its energy level at (Е_с - 0,123 eV) in forbidden band of silicon were calculated. On the observable level of stable configuration C_iC_s (A^-)-defects at (Е_с - 0,147 eV) the theoretical change of carriers concentration in the conduction band simulated by the recharges (C_iC_s)^o was imposed. The concentration of these (C_iC_s)^o-defects has been changed in the process of their recharges. It is shown that in n-Si with high carbon and oxygen concentration after affiliating of oxygen atoms to bistable defect (C_iC_s)^o in a forbidden band of n-Si the stable defects not only in “А” but also in “В” configurations are formed with energy levels at (Е_с - 0,13 eV) and (Е_с - 0,09 eV).

11. SYMMETRIES  OF  THE  KINETIC  PLASMA  THEORY

V. B. Taranov

            Symmetry transformations are found for the kinetic theory of the upper hybrid oscillations of the electron plasma. It is shown that in the cold electron plasma limit the symmetry extension takes place, allowing us to obtain the general solution which is analogous to that found previously in the Lagrangian variables. The results are compared to the known symmetry properties of the Langmuir oscillations of the electron plasma. The algorithm used in the present work to obtain the symmetries of kinetic models of the plasma theory is illustrated on the example of Langmuir oscillations in the multi-component plasma.

12. POSSIBILITIES  TO  INCREASE  RF  ION  SOURCE  PLASMA  DENSITY

V. I. Voznyy,  V. I. Miroshnichenko,  S. N. Mordik, V. E. Storizhko,  B. Sulkio-Cleff

            The possible ways of increasing plasma density in RF ion sources to obtain higher beam brightness are reviewed. Plasma density increase is achieved by initiating an efficient RF discharge in an external magnetic field. Longitudinal magnetic field is generated by a compact magnet system with permanent magnets and ferrites of circular shape. In the source an RF discharge is set up with an external magnetic field of ~40 G and argon plasma density of 3 × 10¹¹ cm^-3 for RF power input into the plasma of 40 W (f_RF = 27,12 MHz). The ion current density inside an extracting electrode in the source is 10 mA/cm² for an emission hole diameter of 0,6 mm. Measurements of the current value and current profile were performed with ion source testing equipment permitting measurements of the current, emittance, mass composition, ion beam energy spread, and RF power input into the plasma.

13. DETERMINATION  OF  THE  DISSOLUTION  DEGREE  OF  THE  FUEL  MULTIPLIER  FALLING  OUT  IN  THE  CHERNOBYL  NPP  EXCLUSION  ZONE  SOILS

А. А. Odintsov

            Sequential extraction techniques have been utilized in order to investigate the degree of binding or association between long-term radionuclides ¹³⁷Сs, ⁹⁰Sr, ^239+240Pu, ²⁴¹Am и ²⁴⁴Cm and different components in soil and fuel particles on the west and northwest trace of fall out in the exclusion zone of ChNPP. The results indicate that in sandy-podzolik soil of flood-lands r. Pripiyt on northwest trace a major fraction 85 % ⁹⁰Sr, 55 % ^239+240Pu, 75 % ²⁴¹Am and ²⁴⁴Cm are associated with different soil components and are easily reachable. On the narrow west trace fall out transformation (dissolution) of fuel particles is in within the bounds 15 – 20%. Degree of transformation fuel hot particles mainly depends on their physicochemical properties.

14. BIOLOGICAL  INDICATION  OF  HIGH  RISK  GROUPS  OF  POPULATION

BY  MECHANOEMISSION  METHOD

V. E. Orel,  I. O. Pavlenko,  G. G. Istomina,  Yu. G. Melnik,  N. M. Dzyatkovska,  V. M. Tereschenko

            Physical dosimetry and biological indication are carried out in conditions of harmful factors after the ChNPP disaster in the Ovruch state forestry in Zhytomyr region, Ukraine. Biological indication was determined by means of mechanoemission method, which is based on the particularities of exhaled air condensate to irradiate light quantum during the mechanical activation. After ChNPP disaster in 1987 – 1989 the index of cesium in the forestry workers’ organisms exceeded on the average in 13,9 times the similar showing of the population in Ukrainian Polesye before the disaster. The received results show that the largest contribution to the middle effective equivalent doze between the representatives of various professional groups of Ovruch state forestry make foresters and woodcutters. The highest probabilistic factor of carcinogenic risk, received on the grounds of mechanoemission condense of exhaled air measurements are registered between them.

15. THE  ⁹⁰Sr + ⁹⁰Y  KINETICS  INVESTIGATION  EXCHANGE 

AND  ABSORBED  DOSES  FORMATION  AFTER  ACUTE  INTERNAL  IRRADIATION

OF  THE  RATS  IN  MODEL  EXPERIMENT

I. P. Drozd,  A. I. Lypska,  Yu. P. Grynevich,  G. Ya. Minchuk

            The possibility of the camera model theory application for the description of metabolic processes in the living organisms has been analyzed. The type of transport matrix of the model has been determined according to physical and biological limits for the system. It has been shown that camera model is stable. It is able to describe uniquely the processes in the living organisms. Model of 10 cameral has been proposed in order to describe ⁹⁰Sr + ⁹⁰Y exchange in the laboratory rats organism. The functions of isotope retention and kinetic constants needed for the practical application of the camera model theory have been determined for each camera. The doses of exposure of the experimental animals’ organs ant tissues have been calculated.

16. CHANGES  IN  THE  POPULATION  STRUCTURE  OF  STEM  RUST  AGENT

(PUCCINIA  GRAMINIS)  UNDER  LOW  DOSE  CHRONIC  RADIATION

A. P.  Dmitriev,  N. I. Guscha,  M. S. Krizanovskaya

            The data concerning the changes in population structure of Puccinia graminis, a causal agent of stem rust under low dose chronic radiation are present. The structure has been changed in 10-km СhNPP zone by appearance of a new population with high frequency of more virulent clones as compared to other regions of Ukraine.

17. RADIOCARBON  RELEASE  LEVELS  OF  NUCLEAR  FUEL  ENERGETIC  COMPLEX SITES  ON  THE  FORMER  SOVIET  UNION  TERRITORY

M. G. Buzinny

             Radiocarbon releases in the form of CO² (¹⁴СО₂) for different sites of nuclear fuel energetic complex on the territory of former Soviet Union were observed in comparison - Fuel reprocessing plant (Tomsk-7, Russia), the greatest on the territory of Ukraine Zaporozhje NPP (operational releases) and Chernobyl NPP (operational and accidental releases). Radiocarbon concentration was examined in tree rings of pine tree. Samples was measured using modern LS spectrometer Quantulus 1220™. Benzene samples were counted adding PPO 4,0 g × L^-1 and POPOP 0,1 g × L^-1 as scintillation agent. Releases value of ¹⁴СО₂ was estimated for Tomsk-7 up to 30 (45) TBq annually since 1985 to 1988 or 450 (620) TBq for operation period of 1959 to 1993. Releases of ¹⁴СО₂ for Zaporozhje NPP was estimated to be up to 2,2 TBq annually. ¹⁴СО₂ releases of Chernobyl NPP was estimated to be up to 3,3 TBq annually or up to 20,8 TBq for operation period till 1996. Chernobyl NPP accidental ¹⁴СО₂ releases fraction was estimated to be 50,0 TBq. Aerosol fraction of radiocarbon accidental release at Chernobyl NPP was estimated from 12 to 62 TBq.

18. THE  NEW  SHORT  PROBE-FORMING  SYSTEM

FOR  A  SCANNING  NUCLEAR  NANOPROBE

S. A. Lebed

            The paper describes an optimized short (total length of 2,25 m) probe-forming system that uses the divided Russian quadruplet of magnetic quadrupole lenses to focus a 3 MeV proton beam. The system permits to create an ion beam spot size <1mm at the probe target in the high current mode with large (0,3 – 1 %) parasitic (sextupole and octupole) pole tip field contamination in the lenses. The optimizing calculations include dominant intrinsic and parasitic lens aberrations. The advantages and shortcomings of the alternative PFSs are shown. The results obtained in the numerical simulation are expected to be used in designing a vertical nuclear nanoprobe with an external ion beam.

19. THE  METHOD  AND  EQUIPMENT  FOR  THE  INVESTIGATION  OF  IONS  ORIENTING  TRANSMISSION   THROUGH  THIN  SINGLE  CRYSTALS

V. I. Soroka, M. V. Artsimovich, I. O. Mazny

            A new approach is proposed to solve the task of angular distribution measurement of intensity strongly differentiated  ions fluxes. Channeling effect makes this problem a regular feature of experimental study of ions orientating transmission through thin single crystals. The approach is based on the use of ions additional scattering by an amorphous (polycrystalline) target after passing through single crystal. The additional target manipulator is joined with the principal target chamber equipmend with three-axis goniometer. The manipulator allows to move an additional target in the vicinity of the accelerator beam within the limits of ± 3º in all directions and allows to measure the angular distribution of scattered ions with the accuracy of 1 min. The method and equipment were tested at the single ended electrostatic accelerator (EG-5) using a proton beam. At present  the measurements have been resumed at the tandem accelerator (EG-10) of the Institute for Nuclear Research of the Academy of Sciences of Ukraine.

20. DEFINITION  OF  THE  ABSOLUTE  ENERGY  OF  BEAM  PARTICLES

FROM  TANDEM  EGP-10K  BY  MEANS  OF  g-SPECTROMETRY

O. Yu. Goryunov,  I. P. Dryapachenko,  E. N. Mozhzhukhin,

V. I. Nikolaev,  N. V. Strilchuk

            The attachment of absolute energy of proton beam from tandem EGP-10K to the nuclear magnetic resonance (NMR) frequency of field device put in rotated magnet-analyzer SP-88 has been made. The determination of beam energy was made with the aid of ⁸⁹Y(p, n)⁸⁹Zr reaction, where the threshold is 3656 keV. 587 keV level from decay of ⁸⁹Zr was used for identification of the reaction. It was determined that NMR frequency f = 16253,5^+4,8_-8,3 Kc/s corresponds to 4272 KeV proton energy.

21. MODERNIZATION  OF  MULTICHANNEL  GAMMA-RAY  SPECTROMETER  AT

THE  SECOND  HORIZONTAL  CHANNEL  OF  REACTOR  WWR-M

V. Y. Berko,  О. О. Gritzay, V. А. Libman

            Fast anti coincidence scheme with one privileged entrance has been developed, made and adjusted for underestimation of background distribution under full absorption peaks of gamma-ray by transformation one track of multichannel pair gamma-ray spectrometer into anticompton spectrometer. Obtained suppression factor of background is from 1,5 to 4, depending on gamma-ray energy.

22. OPTIMIZATION  OF  SAMPLING  FOR  ASSESSMENT  OF  CONTAMINATION  DENSITY

BY  LOCAL  TERRITORY  RADIONUCLIDES

Yu. V. Khomutinin

            The problems of optimal planning amount of the soil sampling for assessment of the local trends of contamination, as well as the problems of reliable detection of the spots at the trend background are considered. The methods are proposed for calculation of a minimal needed number of the soil samples for the estimation of monotonous trend of the terrestrial density of contamination at the fixed value of relative uncertainty and for detection of the spots at the trend background.

23. SYNTHESIS  OF  HIGH  QUALITY  SUPERFINE  STRUCTURAL

POWDERS  OF  SILICIUM CARBIDE

A. I. Karelin, V. A. Karelin, E. D. Domashev, V. E. Domashev,

A. P. Yuferova,  R. A. Abubekerov

            We have synthesized and studied the experimental samples of silicium carbide, which were produced of mechanically activized elemental fine-disperse silicium and pyrolitical soot according to the technology developed by the authors. We have shown that, as a result of synthesis, it is possible to produce the powder of silicium carbide (α- and β-phases) with high purity, nanodimensional fractional composition, and silicium dioxide content not more then 1 - 2 mass %.

24. INFLUENCE  OF  THE  ELECTROPHYSICAL  RADIATION  PROCESSING  ON  THE

SHELF-LIFE  AND  NUTRITIOUS  PROPERTIES  OF  MEAT

M. I. Bazaleev,  V. F. Klepikov,  V. V. Lytvynenko,  I. М. Sharkevich

            The data on absorbed doses and sterilization regimes for meat products, providing toxicological safety and high effectiveness of irradiation processing, are presented. Recommended absorbed dozes for meat sterilization eliminate pathogen bacteria effectively in accordance with the international rules for microbiological control. Sterilization technologies in oxygen free atmosphere are described. We discuss quantitative and qualitative methods for control of absorbed doses, as well as postirradiation control to determine the presence of irradiated food.