1. TWO-PARTICLE  LOW-ENERGY  PHOTODISINTEGRATION  OF  THREE-NUCLEON NUCLEI

I. V. Kozlovsky,  E. M. Malyarzh,  V. K. Tartakovsky

            Differential cross section of two-particle photodisintegration of  and  nuclei are calculated. Both the wave functions of the interpolation model and the proposed wave function of the nucleon-deuteron system constructed by analogy with the Faddeev equations precise solution are used. For both functions the agreement with the experimental data is achieved only for the shape of dependencies. The approximate allowance for the meson exchange currents provides a possibility to fit calculated and experimental cross sections in the magnitude too.

2. Influence  of  vibration-rotation  coupling  in  a  nuclear  structure  on  the  neutron-nuclei  scattering  cross  sections

I. E. Kashuba,  I. A. Korzh ,  N. T. Sklyar,  T. I. Yakovenko

            The dependence of theoretical cross sections of elastic and inelastic neutron scattering on nuclear structure model is studied for the even-even isotopes of selenium. It is shown that the nuclei under investigation may have static deformation while collective vibration motions appear around the deformed soft rotator.

3. Viscosity effects at the nuclear descent from the fission barrier

S. V. Radionov,  F. A. Ivanyuk,  V. M. Kolomietz, A. G. Magner

            We evaluate the temperature  at the scission point and the descent time  from the saddle to the scission of heated nuclei within the liquid-drop model. We use the classical Lagrange-like equations of motion. The nuclear surface is parametrized by the two-parametric family of the Lawrence shapes. Conservative forces are defined through the free energy of the nucleus. We use the friction tensor derived from the boundary conditions on the nuclear surface and from exact solution of the continuity equation for incompressible and irrotational flow. The scission line is determined from the instability condition of the nuclear shape with respect to the variations of the neck radius. The numerical solution of the dynamical equations is carried out for the nucleus . We have defined the viscosity coefficient  from the comparison of the experimental data for the kinetic energy of the fission fragments with computed one. We found a significiant deviation of  obtained within our approach from the value of  obtained within the standard hydrodynamical model.

4. NEW  APPROACH  TO  HEAVY  ION  ELASTIC  SCATTERING  ANGULAR  DISTRIBUTION  ANALYSIS

Yu. A. Pozdnyakov,  K. O. Terenetsky

            The calculation method of summary complete fusion, incomplete fusion, quasifussion and deep inelastic collision s_F and total peripheral reaction s_D cross sections from heavy-ion elastic scattering angular distribution analysis is developed, which allows to understand s_F and s_D formation mechanism for strongly as for weakly bound ions. The method provides to calculate quantitative characteristics of fusion enhancement  (and corresponding peripheral reactions hindrance) for strongly bound ions and, vise versa, of fusion hindrance (and corresponding peripheral reactions enhancement) for weakly bound ones. Besides, there is possibility to calculate probability distribution of different processes over partial waves, giving much deeper insight into the physics of processes, which take place during two heavy ion collision.

5. Properties  of  the  groundstates  of  spherical  atomic  nuclei  in  the frameworks  of  the  extended  Tomas – Fermi  method

V. Ju. Denisov,  V. A. Nesterov

            The characteristics of the groundstates of spherical nuclei has been studied in the frameworks of the extended Tomas - Fermi method. It has been shown that binding energy, rootmeansquare radii and nucleon densities for the b-stable nuclei are in a good agreement with the experimental results. The binding energy, rootmeansquare radii and nucleon densities for the nuclei far from the b-stability line has been calculated as well as for superheavy nuclei. The thickness of the diffusion area for proton, neutron and nuclon density distribution have been calculated also.

6. PECULIARITIES  of  FISSION  OF  actinide  nuclei  FORMED  In  REACTIONS  WITH  LIGHT  PARTICLES

Yu. V. Kibkalo

            The analysis of total fission cross-sections for interaction of a-particles with nuclei ²³²Th, ²³⁵U, ²³⁶U and ²³⁸U in the energy range up to 140 MeV is carried out. The energy dependence of critical value of angular momentum leading to a fissioning system formation for interaction of a- particles with uranium nuclei in a given energy range is obtained. The new approach for description of fission fragment mass distributions of actinide nuclei with accounting of influence of a total angular momentum is offered. The experimental fission fragment mass distributions of nuclei ²³⁶U, ²³⁹Pu and ²⁴⁰Pu formed in reactions with neutrons, g-quantum, a-particles and spontaneous fission in an excitation energy range up to 30 МэВ are considered within the framework of present approach. The parameters dependence of fragment mass distributions on excitation energy and transferred angular momentum of a fissioning nucleus is obtained.

7. EVALUATION  OF  THE  TEMPORARY  CHARACTERISTICS  AND  THE  NUMBER  OF  THE STEPS  OF  THE  GAMMA-ABSORPTION  AND  GAMMA-EMISSIONS  OF  THE  RADIOACTIVE  NUCLEI  IN  THEIR  DECAY  PROCESS

M. E. Dolinska,  N. L. Doroshko,  V. S. Olkhovsky

            Quantum-mechanical method, which was proposed earlier for the theoretical description of the resonance scattering of the g-quantum, was generalizing with Doppler Effect usage. New algorithm elaborated and equations for the definition of the characteristic functions for the energy distribution, decay probability and decay functions obtained. The calculations have been performed for the concrete case of decay exited nuclei ¹⁴С, ⁴⁰K, ⁸⁷Rb, ²³⁸U and ²³²Th under room temperature taking into account Doppler’s effect and without it.

8. THE  DETERMINATION  OF  INTERNAL  CONVERSION  COEFFICIENTS  ON  THE SECONDARY  ELECTRON  RADIATION  AT  INTERNAL  CONVERSION  AND  BETA-DECAY

N. F. Mitrokhovich

            The supplement to the method of determination internal conversion coefficient on the secondary electron radiation (e_o) from transitions in atomic shell is  described. It is based on the calculation output e_o from conversion electron on the base of  measurement output e_o-electrons from SYMBOL 98 \f "Symbol" \s 11b-spectrum.

9. INVESTIGATION  OF  GROUND  AND  FIRST  EXITED  STATES  OF  ⁵Li

O. K. Gorpinich,  Vit. M. Pirnak,  O. M. Povoroznyk,  Yu. S. Roznyuk,  B. G. Struzhko

            The a +d system was investigated in a kinematically complete experiment by ²H(a, pa)n three-body reaction with an a-beam energy 27.2 MeV. The unbound first excited and ground states of ⁵Li were observed and its parameters were determinated. Coincidence pa-spectrum was fitted by model of the sequential decay ⁵Li ground and excited states through the a+p channel. The best agreement with the data was obtained assuming the following parameters of ground state: Е_ap = 2,14 MeV, Г= 1,30 MeV; and of first excited state: Е_ap = 4.8 MeV, Г= 2,0 MeV.

10. FORWARD-ANGLE  ISOTOPIC  AND  ELEMENT  DISTRIBUTIONS  INDUCED  IN  THE  ¹⁸O  (35 × A MeV) + ⁹Be  REACTION

A. G. Artukh,  G. F. Gridnev,  A. G. Semchenkov,  M. Grushezki,  F. Koscielniak,  O. V. Semchenkova,  Yu. M. Sereda,  J. Szmider,  Yu. G. Teterev,  I. N. Vishnevsky

            The double achromatic, large solid angle, high momentum acceptance, and high-resolving separator COMBAS was created in the Flerov Laboratory of Nuclear Reactions, JINR. The layout of experimental setup (separator structure and detector arrangement) is presented. The forward-angle isotopic and element distributions induced in the ¹⁸O (35 × A MeV) + ⁹Be (14mg/cm²) reaction were obtained and analyzed. The Q_gg-systematics, as a criterion for the binary production of isotopes, was used for isotopic yields description.

11. ELASTIC  AND  INELASTIC  SCATTERING  OF  THE  ¹²C  IONS  BY  THE  ¹²C  NUCLEUS  AT  ENERGY  61 MeV

A. T. Rudchik,  V. M. Kyryanchuk,  V. A. Ziman,  O. A. Momotyuk,  A. V. Mokhnach,  O. A. Ponkratenko,  V. K. Chernievsky

            The angular distributions of the elastic and inelastic ¹²С ions scattering on the ¹²С nuclei were measured at the energy of E_lab(¹²C) = 65 MeV for the transitions to the ground and 4,44 МеV (2+) excited states of ¹²C. From the data analysis within the framework of the optical model and coupled reaction model the channel parameters of Woods-Saxon optical potential and ¹²C deformation parameter were found, which provide satisfactory description of the ¹²C+¹²C scattering angular distributions. The energy dependence of the optical model parameters for the ¹²C + ¹²C interactions was studied.

12. ENERGY-LOSS SPECTROMETER FOR  PRECISE  RADIOACTIVE  ION  BEAM EXPERIMENTS  IN  THE VICINITY  OF  THE  COULOMB  BARRIER

V. Z. Maidikov

            The energy-loss spectrometer – very effective set-up for precise nuclear reactions study based on magnetic analysis of primary beam and charged particle nuclear reaction products have been proposed. Based on existing magnetic analyzers, it may increase the magnetic spectrograph efficiency of about two orders of its value in comparison with achieved up to now with no loss of its resolving power.

13. Measurements  and  calculation  of  efficiency  of  stilben  and  NE213 neutron  detectors

            Efficiencies of detectors consisted of NE213 (Ø = 125 mm, Н = 100 mm) and stilben (Ø = 100 mm, Н = 70 mm) scintillators for monoenergetic neutrons with 10.89 МeV energy were measured. The experimental values agree with Monte-Carlo calculations within the limits of 10 %.

14. The  possibility  of  using  the  multiplicity  SPECTROMETER  for determination  of  fissionable  nuclei  content

Yu. G. Shchepkin,  V. I. Slisenko,  Ye. A. Pavlenko,  P. I. Bulan,  V. S. Prokopenko,  Yu. S. Stryuk,  T. A. Kostyuk

            The possibility of using the multiplicity spectrometer for determination of fissionable nuclei content by means of active and indestructible method when research sample is irradiated by thermal neutrons from reactor are presented. The calculated vales of the minimum relative weight concentration of the fissionable nuclei and maximum weight of the research sample matrix equal 3×10^-8 and 170 g correspondingly. The results of the calculations are confirmed by preliminary of measurements when the natural uranium and silicon are irradiated by neutrons.

15. The  determination  of  alpha-ray  emitteR  content  IN  “HOT”  PARTICLES  by means  of  the  direct  alpha-spectroscopy  method

A. P. Lashko,  T. N. Lashko,  A. A. Odintsov

            The method of the determination of ²³⁴U, ²³⁸U, ²³⁸Pu, ^239+240Pu, ²⁴¹Pu, ²⁴²Pu, ²⁴¹Am, ²⁴³Am, ²⁴²Cm and ²⁴⁴Cm content in “hot” particles was proposed. It is defined that the detection limit of these radioisotopes is 0,001 Bq.

16. REACTOR  PRESSURE  VESSEL  OPERATION  LIFE-TIME  DETERMINATION  by  surveillance  samples  testing

E. Grynik,  L. Chyrko,  V. Revka,  Yu. Gulchyk,  O. Drogaev

            The main ideas about WWER-1000 type reactor pressure vessel metal surveillance samples program existing in Ukraine and its shortcomings are presented in the paper. On the basis of the results obtained after investigation of the samples with increased Nickel content irradiated in the reactor within 5 and 9 years it is shown that the irradiation embrittlement ratio for such a metal reaches a designed value.

17. DYNAMICS  OF  MOLECULES  IN  THE  SYSTEM  “POLYVINYLCHLORIDE + PROPYLENE  CARBONATE + SaLt”

M. V. Burmistr,  O. A. Vasilkevich,  P. G. Ivanitsky,  V. V. Klepko,  I. O. Korzh,  V. T. Krotenko,  V. I. Slisenko,  K. M. Sukhy,  V. V. Shilov

            Dynamical processes in polyvinyl chloride systems with contents of 20 % pure propylene carbonate and LiClO₄ solution in propylene carbonate were studied by means of the slow neutron quasi-elastic scattering method. It is found that in a salt solution compared to a pure propylene carbonate the contribution D_F from single particle motions in the total diffusion coefficient does not alter, while contribution D_L ensured by the motion of Lagrange particles grows considerably. Possible version of the charge transfer mechanism in the system “polyvinylchloride + propylene carbonate + salt” is proposed.

18. INVESTIGATIONS  OF  AIRIONS  PROCESSES  AND  DEVELOPMENT  OF TECHNOLOGICAL  FACILITIES

V. I. Sakhno,  S. P. Tomchay

            Technologies using the ions of air (airions) have widely adopted in industry. It stimulates the necessity of deep study of the physics of airions and development of new more advanced engineering means for realization of the airions technologies in industry. This article reflects the results of investigation of airions application peculiarities in the technologies of sea-products processing, received by authors.

19. FIRE  HAZARDS  ESTIMATION  OF  THE  RESEARCH  NUCLEAR  REACTOR  WWR-M

S. I. Azarov,  E. V. Babich,  L. N. Vilenska,  A. I. Malko

            The results of the investigations of the appearance of exposures and fires in the research nuclear reactor WWR-M are submitted. The data on evaluation and forecasting of fire dangerous situation as well as the development of management solutions by operative technical tasks for emergency services are presented.

20. ABSORPTION  OF  LOWER  HYBRID  AND  UPPER  HYBRID  PUMP  WAVES  IN  MAGNETIZED  PLASMA

V. N. Pavlenko, V. G. Panchenko, S. A. Nazarenko

            The kinetic theory of fluctuations in the spatially homogeneous and inhomogeneous magnetized plasma in the presence of a HF pump wave field with frequencies near the lower hybrid and upper hybrid frequencies is developed. The effective absorption length is calculated. It is shown that for the thermonuclear plasma the effective absorption length is of the same scale as plasma dimension that ensures effective dissipation of the HF pump power.

21. ION  ASSISTED  ETCHING:  INFLUENCE  OF  THE  ION  CHARGE  SIGN

S. N. Pavlov

            The relative influence of the ions of different signs on the ion-assisted etching of silicon is under investigation. The fluorine radicals are produced by the direct current glow discharge with pressure gradient. The beam of positive or negative ions is produced by PIG source. The flows of radicals and ion beam are met on the surface of the silicon placed in high vacuum. The positive ions can be converted into the fast neutral atoms by method of resonance exchanging in an own gas. It is shown that the fast neutral atoms have the highest stimulating ability. The catalytic influence of the positive ions is in two times less. The negative ions have the intermediate parameters. It is found that some kinds of ions (for example, molecular oxygen) decelerate the etching that is they behave itself like an inhibitor.

22. the  effect  of  the  electron  beam  initial  modulation  degree  on  the evolution  within  the  barrier  of  the  space  charge  wave  performing its  transillumination

N. O. Boyko,  D. B. Palets,  L. I. Romanyuk

            The effect of the initial modulation level of electron beam on evolution within the barrier of the space charge wave created in the beam by this modulation is studied experimentally. The character of this evolution is found to change provided a certain level of initial beam modulation is exceeded. This is ascribed to nonlinear processes of the artificially created and intrinsic space charge waves interaction with plasma electrons and their concurrence.

23. THE  PLUTONIUM  ISOTOPE  content  IN  SOILS  OF  THE  CHERNOBYL  EXCLUSION ZONE

V. A. Ageev,  A. P. Lashko,  T. N. Lashko,  A. A. Odintsov,  V. P. Khomenkov

            Program package for analyzing of alpha-spectra is proposed. The complete isotope content of plutonium in the Chernobyl accident zone was determined by means of this package.

24. Particular  feature  of  radioactive  contamination  of  fish  ponds 

of  North  part  of   Rivne  region

E. N. Volkova,  V. V. Belyaev,  Z. O. Shirokaya,  N. L. Shevtsova,  T. P. Prityka,  V. A. Karapysh

            The results of studies of radioactive contamination of fish ponds at Rivne region were presented. Data of ⁹⁰Sr and ¹³⁷Cs content in abiotic and biotic components were analyzed.

25. The  main  conformities  of  the  autotrophic  link  vegetation  in conditions  of  different  levels  of  radioactive  contamination

V. G. Klenus,  V. I. Shcherbak,  A. E. Kaglyan,  V. V. Belyaev

            Studies of the phytoplankton structure - functional characteristics of the water bodies: Kyiv reservoir, water coolant body of the Chernobyl NPP, lake Glyboke, which differ by the level of the radioactive contamination have been carried out. It was established that the role of the phytoplankton in radionuclides migration at aquatic ecosystems after Chernobyl NNP accident had increased.

26. THE  RESULTS  OF  FLUORESCENCE  SPECTRUMS  OF  OAK  AND  BIRCH  LEAVES  INVESTIGATION  FROM  THE  30-kilometre  INFLUENCED  ZONE 

OF  CHERNOBYL  NPP

E. I. Levchik,  E. V. Svarichevskaya,  G. O. Bekirova,  E. G. Gule,

A. A. Odintsov,  N. A. Shovkun

            The results of a long-term research of lazer induced fluorescence of foliage trees` leaves (oak, birch) that grow in different conditions of radioactive pollution (30 - kilometre zone of Chernobyl NPP) are presented.

27. Accumulation  of  radionuclids  by the  shells  of  Dead  bivalves

 D. V. Lukashоv,  O. L. Zarubin

            During the field experiments was established, that the shells of dead bivalves can additionally accumulate ¹³⁷Cs and ⁹⁰Sr from water. It was also established that ⁹⁰Sr is basically accumulated. Radionuclids’ accumulation intensity by shells is related to specific shells surface area. It is expected, that this phenomenon is related to the adsorption processes of given radionuclids on the shells nacreous layer interior surface.

28. THE  ACCUMULATION  OF  ACCIDENT’S  ¹³⁷Cs  IN  THE  DIFFERENT  PARTS  OF THE  MYCORRHIZAL  FUNGI

N. E. Shatrova

            The research of ¹³⁷Cs accumulation in the different parts of fruiting body of different species of mycorrhizal mushrooms was conducted in the forests of the Chernobyl NPP Alienation zona of and “south track”. Measurements of 3 parts of the fruiting bodies of fungi show that the gills have the highest content of radiocesium. Caps and stalks have the lowest concentration of ¹³⁷Cs.