О. О. Gritzay, V. V. Коlоtyi, А. I. Каltchenkо, P. M. Vorona, M. L. Gnidak……………

1. SLOW  NEUTRON  INTERACTION  WITH  ⁷⁴Ge  ISOTOPE

V. A. Pshenichny,  O. O. Gritzay

            The experimental results of total neutron cross section measurements for ⁷⁴Ge isotope in the energy range 5 – 1500 eV using the time-of-flight method at Kyiv Research Nuclear Reactor are presented. The experimental data on total neutron cross section for ⁷⁴Ge isotope in this energy range are absent in scientific publications. Nontraditional method for estimation of the bound level resonance parameters and potential scattering radius R^/ using the thermal neutron capture cross section data  was proposed. Estimation of the bound level resonance parameters and potential scattering radius R^/ is performed; the obtained results were compared with the known published data.

2. MEASUREMENTS  OF  ⁵²Cr  EFFECTIVE  TOTAL  NEUTRON   CROSS SECTION

AT  THE  ENERGY  24 keV

О. О. Gritzay,  V. V. Коlоtyi,  А. I. Каltchenkо,  P. M. Vorona,  M. L. Gnidak

            The total neutron cross section for ⁵²Сr nucleus was measured at the neutron energy 24 keV. The measurements were taken using the  transmission method of filtered neutrons from reactor horizontal channel and chromium metal sample (enrichment 99,3 % ⁵²Cr, thickness 1,208 · 10²³ 1/cm²). The optimized content and characteristics of filtered neutron beam with the maximum of basic energy line 24,3 ± 0,8 keV and minimum of impurity energy lines were received using our own calculation code and modern neutron data from evaluated neutron data library JENDL-3.2. The calculated shape of nuclear spectra is shown just as the experimental value of filtered neutron flux from the 8^th horizontal channel calculated with the activation of ¹⁹⁷Au thin sample. The measured value of ⁵²Cr effective total neutron cross section for 24 keV quasimonoenergetic neutrons - s _t ^ef. = 2,099 ± 0,012 b was compared with known experimental values from CSISRS library and the values calculated with evaluated nuclear data libraries.

3. APPLICATION  OF  THE  EXTENDED  TOMAS – FERMI  METHOD  FOR  THE

PROPERTIES  INVESTIGATION  OF LIGHT  NEUTRON  EXCEED  ATOMIC  NUCLEI

V. A. Nesterov

            The extended Tomas - Fermi method has been applied for computing of integral characteristics of the nuclei with Z = 4 - 8, placed near the b-stability line. It has been concluded supposed, that in such nuclei nucleons are moving in the smooth fields and methods, based on the smooth average fields conception, which cannot be used for the nuclei with N » Z, are applicable for properties description of izotopes with high neutron excess.

4. EFFECTIVE  PROBABILITIES  METHOD  FOR  HEAVY-ION  ELASTIC  SCATTERING ANGULAR  DISTRIBUTION  ANALYSIS

Yu. A. Pozdnyakov

            Previously proposed the new approach to heavy-ion elastic scattering angular distributions analysis is generalized for the cases when the total (i.e. summed over all channels) partial probabilities of “fusion” (in general complete and incomplete fusion, quasifission and deep inelastic collisions) enhancement are comparable with total partial probabilities of “fusion” hindrance. It became possible due to effective total partial probabilities introduction, every of which is a linear combination of either actual total partial probabilities. It is shown that introduced in such manner probabilities have quite definite physical meaning. Really, effective total partial probabilities allow to calculate entrance channel “fusion” cross section and certain reference peripheral processes cross section, comparison with which calculated or measured correspondingly “fusion” or total peripheral reaction cross section allows one to predetermine about “fusion” or peripheral reactions enhancement or hindrance. It is also established that “fusion” enhancement is accompanied by peripheral reactions hindrance, and vice versa.

5. Mechanism  of  fast  neutrons  inelastic  scattering BY  copper  nuclei

 I. O. Korzh,  N. T. Sklyar

            Applicability of the optical statistical approach version, based on the spherical optical model, model of an excited core and modern versions of statistical model, for the description of a neutrons inelastic scattering by ⁶³Cu and ⁶⁵Cu nuclei was studied first in the energy range from a threshold up to 9 Mev. Within the framework of this approach the possibility of an adequate description of experimental data set on inelastic scattering cross-sections was shown. The results of the theoretical analysis were used for investigation of fast neutrons inelastic scattering mechanism by the studied nuclei. It was shown, that a compound mechanism of inelastic scattering gives the predominant contribution to excitation cross-sections of the lowest three levels of studied nuclei only in the neutron energy range up to 5 Mev, and at the end of studied energy range these levels are excited by means of the direct scattering mechanism.

6. Approach  to  kinematically  complete  MEASUREMENTS  of  the  FINAL state  INTERACTIONS  for  TWO  products  of  deuteron  breakup  by PROTRONS  With  ENERGY  5,5 MeV

I. P. Dryapachenko,  V. V. Zhuk,  L. P. Kacubo,  E. M. Mozhzhuhin,  A. A. Shvedov

            The purpose of this paper is to obtain the data for separation of parameters of the two body scattering amplitude and interaction in energy range 0 - 400 keV, that is practically impossible in direct experiments “beam – target”. Chosen geometric conditions of registration on coincidences of two reaction products          p + d → p + p + n allow to observe their interaction with the large validity if nucleons in pp- or pn- pairs move in the same direction. Requirements and available conditions of preparation and undertaking kinematically complete experiment for registration on coincidences of two protons from deuteron breakup are discussed. The data for several sets of kinematic conditions of experiment are presented.

7. SPECIFICATION  ICC  g -TRANSITIONS  IN  THE  ¹⁵³Gd  AND  ¹⁶⁰Tb  DECAY

 N. F. Mitrokhovich

            Based on performed specification of internal conversion coefficients (ICC) for basic g-transitions in decay ¹⁵³Gd and ¹⁶⁰Tb the anomalies in ICC, conditioned by penetration effect were defined and studied. For g70(M1+E2) and g103(M1+E2) in decay ¹⁵³Gd a penetration parameter in M1-component is measured, which equal accordingly 0,8 ± 1,2 and 4,7 ± 0,4. The values d is defined with calculation l and equal to 0,105 ± 0,008 and 0,117 ± 0,004. In decay ¹⁶⁰Tb anomalies in ICC are defined for g-transitions 299, 1178, 1272 keV with E1 multipolarity and definite penetration l_i parameters. For g 299 l₁ = -1,8 ± 1,3; for g1178 l₁ = 2 ± 0,9; for g 1272 l₁ 1 = 1 ± 0,5; l₂ =17 ± 3; l₃ = 3,8 ± 0,5.

8. HYPERNUCLEI    AND    WITHIN  TWO-  AND  THREE  CLUSTER MODELS:  ELASTIC  SCATTERING  DIFFERENTIAL  CROSS-SECTIONS 

M. V. Evlanov,  A. M. Sokolov,  V. K. Tartakovsky

            Using the formalism of two- and three-cluster models the differential cross-sections of elastic diffractive scattering of hypernuclei  and on light and heavy nuclei taking into account the multiple scattering procceses and nuclear edge diffuseness are calculated. The influence of hypernuclear structure, particular the projectile binding energy on the cross-sections behavior, is studied as well.

9. ELASTIC  SCATTERING  OF    IONS  BY    AND    NUCLEI  NEAR  THE  COULOMB  BARRIER

V. P. Verbitsky,  V. О. Romanyshyn,  К. О. Terenetsky

            Experimental elastic scattering cross sections of  ions by  and  nuclei at 10 МеV and 14,7,  16,2,  17,8,  19,1,  22 МеV, respectively, are analyzed in the framework of optical model with electric optical potential using. This potential allows to take into account the polarizability and breakup of  projectile in the field of target nucleus by the effective way. The considerable influence of projectile breakup on elastic scattering cross sections formation near the Coulomb barrier is shown. The last fact is the direct evidence of dineutron configuration subsistence in the ground state in this exotic nucleus.

10. The  investigation  of  ⁹⁹Mo  decay

A. P. Lashko,  T. N. Lashko

            Spectra of gamma rays from the ⁹⁹Mo decay have been investigated by means of HPGe-detectors. The new data on relative intensities of gamma rays were obtained for region of energy above 150 keV. The level scheme of ⁹⁹Nb was discussed. The existence of exited states 1004,06,  1072,21, 1129,14 and 1198,9 keV of ⁹⁹Nb was confirmed. The existence of 761,24 and 1171,96 keV energy levels in the decay scheme was not verified.

11. MANAGEMENT  OF RADIOACTIVE  WASTES  ON  THE  WWR-M  REACTOR

V. I. Slisenko,  N. I. Valkovska, 

V. N. Domnikov,  V. S. Prokopenko,  Yu. S. Stryuk

            The management of radioactive wastes on WWR-M reactor of the Institute for Nuclear Research has been analyzed. Data of the formation of the radioactive waste, their general characteristics, the place for their storage and ways of increasing the radiation safety while handling with radioactive wastes are presented.

12. LIFETIME  OF  NONEQUILIBRIUM  STATISTICAL  SYSTEMS  AND  LIFETIMES  

OF  NEUTRONS  IN  THERMAL  NUCLEAR  REACTORS

V. V. Ryazanov

            It is supposed that the nonequilibrium statistical operator implicitly contains the lifetime. The operations of obtaining taking of invariant part, averaging on initial conditions is used in works of D. N. Zubarev, temporary coarse-graining (J. G. Kirkwood), choose of the time direction are replaced by averaging on lifetime distribution. The expression for average lifetime of nonequilibrium system is derived. General expressions obtained for nonequilibrium lifetime of statistical systems are applied for consideration of neutron system in nuclear reactor.

13. PROBLEMS  OF  VERIFICATION  OF  SYSTEM  CODES  FOR  MODELING  TRANSIENT  AND ACCIDENTAL  MODES  OF  NUCLEAR  POWER  PLANTS

E. D. Domashev,  M. M. Kovetskaya,  A. Yu. Zenyuk,  V. N. Kolochko

            We carry out an analysis of using RELAP and CATHARE system codes for modelling accidental modes of nuclear power plants. We show that the problem of modelling heat transfer crisis caused by drying of heat-transfer surfaces under non-stationary conditions.

14. MCSS – program  of  neutron  transport  calculation  to  location  of  surveillance  specimens  in  reactor  vver-1000. variance reduction scheme

O. V. Grytsenko,  V. N. Bukanov,  V. L. Dyemokhin

            The necessity of development of the variance reduction scheme for usage in MCSS program is well grounded. The criterions of nonanalog method selection are stated. The most important elements of the developed scheme are described. Opportunities of numerous problems solution by usage of this scheme and opportunities of expanding its applicability are shown.

15. EXPORT  CONTROL  OF  NUCLEAR  MATERIALS,  TECHNOLOGIES AND  DUAL  USE  COMMODITIES

I. Е. Anokhin,  A. V. Vertsimakha,  V. V. Davidovsky,  S. A. Yatskevich

            Modern problems of the export control system of nuclear materials, technologies and dual use commodities in Ukraine are analyzed. The examples of successful solutions of these problems in the framework of INR and SSECU joint projects are given. The software products, developed in the INR for the system of export control of Ukraine, are reviewed. Further integration of the INR into the system for export control is underlined to be perspective.

16. STATISTICAL  MODEL  OF  A  COLLOIDAL  PLASMA

WITH  DYNAMIC  RECHARGING

M. O. Vakulenko

            The low-frequency excitations in colloidal plasma with dynamic recharging were investigated on the ground of the renormalized statistical approach. It was shown that the dynamic recharging conditioned by electron-dope and ion-dope interaction gives a rise to additional nonlinear broadening of the electrostatic spectrum and to renormalization of the absorption frequency. The renormalized width of the long-wave potential spectrum is much larger than the conventional one and is independent on the wavenumber, so that the energy transfer towards large wavelengths is absent, and the Kolmogorov spectra are forbidden. An interesting result is that the anomalous diffusion is strongly reduced by dynamic recharging. All this makes it possible to assume that colloidal plasmas are the interesting objects for further theoretic and experimental investigation.

17. OBSERVATION  RESULTS  OF  ENVIRONMENTAL  OBJECTS  IN  INR  OF  NAS  OF UKRAINE  WWR-M  RESEARCH  REACTOR  AND  TRITIUM  LABORATORIES DURING 1995 - 2000

E. V. Svarichevskaya,  A. I. Kuzmina,  G. O. Bekirova,  E. I. Levchik,  O. V. Svyatun

            The results of radioecological monitoring in the influented zone of INR NAS of Ukraine WWR-M research reactor and tritium laboratories are presented/ These results included the six years monitoring parametres in control points: total specific b-activity and specific ⁹⁰Sr activity of atmospheric precipitations, settling dust, soil and plunts; total specific b-activity in main reactor collectors and tritium laboratories, natural reservoires; content in the air short- and longlived a- and b-aerozoles, the tritium consentration in throw off waters of the main collectors, in melting waters and birch juice, g-backgraund. The levels of radioactive pollution of these objects aren’t higher then permited for Kyiv and lower then Ukrainian standart values.

18. ROLE  OF  SLOW  CALCIUM  CHANNELS  IN  THE  ACCUMULATION  ⁹⁰Sr

OF FRESHWATER  MUSSELS

D. V. Lukashov

            Accumulation process of ⁹⁰Sr and ¹³⁷Cs by freshwater mussels Unio conus (Bivalvia, Unionidae) in natural conditions was investigated. The mussels that treated by verapamil accumulated of ⁹⁰Sr in 2.8 times slowly. It is evidence that slowly calcium channels have great importance in process of radiostrontium accumulation. The process of ¹³⁷Cs accumulation by this verapamil treating individuals is in 1,3 times quickly than clear mussels at the same time.

19. RADIOACTIVE  CONTAMINATION  SPOTS  DYNAMICS

IDENTIFICATION  PROBLEMS

I. S. Yeremeyev

            The approach of radioactive contamination spots (RCS) dynamics identification, based on Euclide metrics definition which characterize the steady disagreement between results of plural RCS radioactive condition measuring procedures provided by means of stable measuring net configuration is proposed.

20. IFLUENCE  EXOGENIC  INDOLYL-3-ACETIC  ACID  (IAA)  ON  KINETIC  GROWTH 

OF  AVENA-COLEOPTILE  PROCESS  UNDER  IONIZING  RADIATION

G. D. Slinyavchuk

            The impact of exogenic IAA on rhythm growth in Avena-coleoptile under ionising radiation was studied. It was revealed saving rhythm growth in presence of IAA but the rhythm frequency is slowed in this case. These results are typical start in cells reparation process, that save energy by slowing rhythm growth of coleoptile. The number of gene and nucleotide pairs have been accounted that might be responsible for the rhythm growth in coleoptile.

21. CHANGES  DYNAMICS  OF  RATS  BLOOD  SERUM  INDEXES  DUE  TO  ROENTGEN RADIATION  LITTLE  DOSES  ACTION  AND  ERSOL  PREPARATION

G. G. Savchuk,  G. I. Mardar,  Yu. P. Grynevich

            The peculiarities of change dynamics of Roentgen irradiation of 0,25, 0,5, 1,0 Gy doses on the important biochemical indexes of rats’ organisms homeostase had been studied. It had been shown that radiation of those doses had caused returned changes of activity of aminotranspherases, thricilgliciroles, holesterole and glucose in rats’ blood serum. Essential shifts in lipid change were observed. According to the experimental results the sensitive index indicating the radiation defeat was the growth of usual lipids content during the whole period of investigation and phase character of alkaline phosphatase activity changes and decrease of free iron concentrations depending of irradiation doses. Ersol preparation usage had made a good effect on the most studied biochemical indexes of rats’ blood serum irradiated by 0,5 Gy dose.

22. EVALUATION  OF  ²⁴¹Аm GENOTOXICITY

IN  TEST-SYSTEM  OF  ALLIUM  CEPA  L.  SEEDLINGS  ROOT  TIP  CELLS

N. K. Kutsokon,  D. M. Grodzinsky,  N. M. Rashidov,  V.V. Trishin

            The present study was designed to elucidate the rate of chromosome damages induced by ²⁴¹Аm in plant test-system. The seedlings of onion Allium cepa L. were used as a test-system. The impact of ²⁴¹Аm -irradiation on the frequency of chromosome aberration (FCA) in root tip cells (using anaphase method), mitotic index (MI) and energy of germination (EG) was evaluated. The seed were soaked and germinated in ²⁴¹AmCl₃ solutions different concentrations (1,5 × 10^-9 - 3,0 × 10^-7 g/l). Water solution-to-plant transfer factor for Am²⁴¹ was found to be 0,18 ± 0,04. The effect of γ-irradiation on FCA on the same assay was also evaluated for comparison with that of ²⁴¹Аm to establish the relative biological effectiveness (RBE) of ²⁴¹Аm. We revealed strong effects on both FCA and MI at γ-irradiation. The clearest impact of ²⁴¹Am-irradiation on EG-parameter was registered. We had not received statistically significant values that could demonstrate any changes in FCA in seedlings grown on ²⁴¹Am-contained solution in comparison with the control. We revealed the greatest rate of difference of FCA in one case, than concentration of ²⁴¹Am in solution was 1,5 × 10^-8 g/l. This rate was taken to account the RBE and it amounted to 58 ± 18. The real number of RBE should be some lower due to differences between condition of α- and γ-irradiation.

23. PARAMETERS  OF  ¹³⁷Cs  ACCUMULATION  BY  CTENOPHARYNGODON  IDELLA  (VALENCINNES)  MUSCLES  IN  FISHING-CRIBS  IN  COOLING-POND  OF  ChNPP

O. L. Zarubin,  A. A. Zalissky,  L. A. Golovach

            The accumulation of ¹³⁷Cs by Ctenopharyngodon idella (Valencinnes) was studied up keeping it in fishing-cribs in cooling-pond of ChNPP. In May 2000, at the beginning of research, the contents of ¹³⁷Cs in muscles was 70 - 130 Bq/kg. The equilibrium condition of the ¹³⁷Cs contents in water, forage (Phragmitela australis) and C. idella has started in 2,5 – 3,5 months after the beginning of the experiment. At this time ¹³⁷Cs contents in muscles has achieved 1600 - 2600 Bq/kg. During subsequent 13 months the contents of ¹³⁷Cs varied within the limits of 1600 - 3800 Bq/kg, that, probably, is explained by peculiarities of seasonal dynamics of radiocesium behaviour in cooling-pond.

24. ¹³⁷Cs  in  nonpredatory  fish  In  water  body  OF  different  typeS

E. N. Volkova,  V. V. Belyaev,  Z. O. Shirokaya,  O. L. Zarubin,  Yu. M. Sitnik,  

A. E. Kaglyan,  V. A. Karapysh,  V. G. Klenus

            The data of ¹³⁷Cs content in nonpredatory fish in water body of different types were presented.

25. POLARIZED  BEAMS  POLARIMETERS  AT  ЕNERGY  RANGE  0,07 – 1 BeV

            It is considered and analyzed the possibilities to design the various ions polarimetry at wide energy range. The problem is connected with the depolarization resonance at acceleration in the cyclic ion storage rings (ISR) including project of the ISR at the INR, and depolarization phenomena in the accelerated ions transportation lines. The main requirements are formulated: universality at wide energy range and various ions masses, maximal effectivity, the most useful suitable analyzing nuclei and reactions, contemporary data on analyzing powers. From the kinematical calculation angle ranges of the secondary particles are defined and the methods of background counts suppression are proposed. The scheme of polarimeter capable to work as at ISR ion acceleration so at polarized circulating in ISR beams needed for experiment energy is described. The scheme includes the target unit, a polarimeter chamber and detector system.

26. СOMPUTATION  OF  LIGHT  OUTPUT  ENERGY  DEPENDENCE  OF  A  NAJ(Tl) SCINTILLATION  DETECTOR  FOR  P,  D,  T,  ³He AND ⁴Нe  REGISTRATION

O. K. Gorpinich,  O. M. Povoroznyk,  O. O. Jachmenjov

            The calculations method of light output energy dependence of a NaJ(Tl) scintillation detector designed with the purpose of correct carrying out of energy calibration of composed DЕ – Е-spectrometer is described.

27. ECONOMIC  AND  PROMPT  EXPEDIENT  OF  DERIVING  PURE  FILMS  FROM  HIGH-MELTING  ISOTOPES  FOR

NUCLEAR-PHYSICAL  INVESTIGATIONS

            Free films (targets) from high-melting boron, zirconium, molybdenum isotopes of textured structures are prepared and explored by the method of uncrucible zone melting. 2 sm² films of £1 mg / sm² thickness with homogeneity about 1 % and high cleanness ensure the opportunity of studying the nuclear reactions with a required precision of measured accuracy.

28. A  HIGHLY  EFFICIENT  H^-  ION  SOURCE  FOR  CYCLOTRONS

А. V. Demyanov,  A. I. Kolosov

            An internal high current H^- ion source for cyclotrons and other accelerators were developed, where some very effective methods of H^- ion production are used. The source is distinguished by high gas efficiency. A plasma-surface method for H^- ion production without using cesium vapour was applied.

29. THE  DEVICE  FOR  CONTROL  OF  PARAMETERS  OF  COOLING

THE  EQUIPMENT  OF  THE  ACCELERATOR

A. V. Sakhno,  V. I. Sakhno,  S. P. Tomchay

            The device intended for protective еру accelerator equipment from an overheating is described. The method, as basic for operation of this device allows to provide the equipment cooling control.

30. DETERMINATION  OF  THE  BEAM  EMITTANCE  BY  PEPPER-POT-METHOD

M. E. Dolinska,  N. L. Doroshko,  A. K. Zaichenko

            The new algorithm for the determination of the beam emittance and Twiss parameters of the accelerate particles, using measurement results of the beam intensity distribution in the transverse plane with pepper-pot diagnostic device is suggested.