QUANTUM UNIVERSAL ENVELOPING ALGEBRAS WITH IDEMPOTENTS AND THE PIERCE DECOMPOSITION

S.A. Duplij, S.D. Sinel’shchikov

Full Text :   (573 kB, Rus.) 

Abstract
This work introduces quantum bialgebras, which differ from the standard U_q(sl₂) by presence of von Neumann regular Cartan-like generators and the associated idempotents. Both invertible and von Neumann regular antipodes on such bialgebras are presented explicitly; the latter case leads to a von Neumann-Hopf algebra structure. Also, explicit forms of some particular R-matrices (also invertible and von Neumann regular) are presented, and the latter respects the Pierce decomposition. Some finite dimensional representations for those algebras are constructed.

KEY WORDS: bialgebra, antipode, Hopf algebra, R-matrix, idempotent, Pierce decomposition, von Neumann regularity

PROMPT PHOTONS IN PROTON–PROTON SCATTERING AT THE LARGE HADRON COLLIDER

V.V. Kotlyar, N.I. Maslov, A.O. Shcheglova

Full Text :   (805 kB, Rus.) 

Abstract
Prompt photon production in pp → γX is studied taking advantage of event generator Pythia. Calculations are carried out at energies 2…14 ТeV in the area of transverse momenta ^p_T < 200 GeV/с and pseudorapidities |η| < 10. Relative role of mechanisms of pp → γX is investigated both in leading order of perturbative QCD and with inclusion of next-to-leading order processes. Spectra of isolated photons to be measured with the help of photon spectrometer PHOS in ALICE experiment at the LHC are discussed. Computed cross sections are compared with results obtained by other authors and with experimental data.

KEY WORDS: event generator Pythia, prompt photons, proton-proton scattering, photon spectrometer PHOS, ALICE experiment, large hadron collider

LOCAL FERMIONIC SYMMETRY OF GREEN-SCHWARZ SUPERSTRING IN TENSORIAL SUPERSPACE

A.J. Nurmagambetov

Full Text :   (191 kB, Rus.) 

Abstract
We propose an action functional of a closed superstring in a generalized D=5 superspace parameterized with tensorial type coordinates. Unlike early considered formulations of superstrings in tensorial superspaces the proposed action is a structure analog of the standard Green-Schwarz superstring. We find the explicit form of the local fermionic symmetry transformations and demonstrate that the invariance of the action under the local fermionic symmetry transformations requires additional restrictions on background fields of the model.

KEY WORDS: supersymmetry, superstrings, tensorial superspace, local fermionic symmetry

THERMAL SAFETY DURING DRY STORAGE OF VVER-1000 SPENT NUCLEAR FUEL ASSEMBLIES

S.V. Alehina, V.N. Goloshapov, A.O. Kostikov, S.A. Pismenetskiy, V.G. Rudychev

Full Text :   (845 kB, Ukr.) 

Abstract
The thermal conditions inside the ventilated cask filled with spent nuclear fuel were investigated by computer simulation method in the case of different activity of the fuel assemblies. The problem is considered within the framework of quasy-stationary three-dimension entailing approach including the convective and radiative heat exchange. The calculations were completed for the different alternative of cask loading with the spent fuel assemblies. The assemblies temperature variation during their storage has been determined. The thermal safety has been proved of the technology of dry storage of the spent nuclear fuel.

KEY WORDS: thermal safety, spent nuclear fuel, dry storage, dry depositary, ventilated cask.

THE CHARACTERISTICS OF RADIATION FIELD FROM DRY STORAGE OF SPENT NUCLEAR FUEL ON ZAPOROZHYE NPP

S.P. Klimov, V.T. Lazurik, A.E. Luchnaja, S.A. Pismenetskiy, V.G. Rudychev, Y.V. Rudychev

Full Text :   (507 kB, Rus.) 

Abstract
For the calculation of the radiation field around the ventilated cask for dry spent nuclear fuel storage of Zaporozhye NPP the methods were modified that based on the use of Monte Carlo packages MODEASHE-M and MCNPX. For time expenses decreasing the special methods of diminishing of dispersion were used: method of translations of trajectories of quanta and exponential transformation in MODEASHE-M code; the «geometrical spallation» ("geometry splitting") in MCNPX code. For ventilated cask VSC spectra have been obtained and angular distributions of radiation out of cask and also the change of parameters of radiation depending on time keeping and dependence of dose rate on the distance to the surface of VSC. It was shown that characteristics of VSC radiation are dependent on the fuel assemblies located on the perimeter of basket of cask. Comparison of the calculated distributions of dose power along the surface of VSC with their measured values shows the excess approximately at 1.4 times.

KEY WORDS: irradiated nuclear fuel, spent fuel storage, gamma-ray spectrum, concrete ventilated cask, spent fuel assemblies

NUCLEAR-PHYSICAL METALLOGRAPHY OF STEELS

V.G. Kirichenko, A.I. Kirdin

Full Text :   (2133 kB, Rus.) 

Abstract
Тhe principles of nuclear-physical metallurgy of steels by using nuclear gamma resonance (Mössbauer effect) were considered. The phase analysis results of iron-ore and high quality rerolling materials at all stages of steel making as iron-ore recovery and concentration, palletizing, sintered ore manufacture and ironmaking were described. The results of investigations of hyperfine interactions and phase transformations in austenitic corrosion-resistant steels under complex thermomechanical treatment, irradiation, welding and corrosion were described. It was found the concentration inhomogeneous of austenite distribution by depth in welding joints and thermal influence zones in 06Х16Н15М3Б and 12Х18Н10Т steels. It was experimentally established modification of structure and phase stability under gamma irradiation. This modification was more distinctly revealed in the presence of structure and phase inhomogeneous, which is typical for process of cold plastic deformation. It was found the joint effect of cold plastic deformation and gamma irradiation on direct and inverse γ -α transformation evolution. Steel corrosion in gas and liquid medium leads to formation of heterogeneous phase oxide film.

KEY WORDS: nuclear-physical methods, hyperfine interactions, Mössbauer effect, steel, alloying, surface, electron structure, irradiation, corrosion.

RESEARCH OF PROCESSES OF PRODUCTION AND FEATURES OF PROPERTIES HIGH-PURITY OF TUNGSTEN

V.G. Glebovsky, G.P. Kovtun, N.G. Kovtun, E.D.Shtinov

Full Text :   (165 kB, Rus.) 

Abstract
Processes of deep refinement of tungsten with use of a complex of chemical and physical methods in the certain sequence are investigated: an ionic exchange, thermal decomposition, zone sublimation, hydrogen restoration, electron beam zone-melting. After refinement by complex methods, the majority of metallic impurities (~60 elements), containing in tungsten, are at a level 10^-6 ÷ 10^-7 ат. %, and the ratio of electric resistances R300K/R4.2K of monocrystal samples of tungsten reaches 100000. The given level of cleanliness of tungsten corresponds to the best world achievements. At high-purity monocrystals of tungsten at lower temperatures find out a row of the new properties, which are not observed earlier: it is observed anomalous high magnetic resistance, the magnitude of factor of the Hall changes, there is of static skin-effect.

KEY WORDS: tungsten, complex refinement, high-purity monocrystals, properties

ACCOUNTING FOR SPONTANEOUS GENERATION OF MODULATED AT COMBINATION FREQUENCIES CURRENTS IN THREE-WAVE INTERACTIONS

A.V. Kirichok, V.M. Kuklin

Full Text :   (311 kB, Rus.) 

Abstract
The process of generation of oscillations by nonlinear currents at combination frequencies is included to the system for description of three-wave interactions in plasma. It is shown that this process demonstrates all characteristic features for spontaneous radiation. The relations between spontaneous and induced terms, describing "current-wave" interactions is noted cover not only dynamics of wave energy but dynamics of phase characteristics of the interaction.

KEY WORDS: three-wave interactions, spontaneous and induced radiation, noise generation.

MEASUREMENT OF DEAD TIME

S.A. Dushkin, V.A. Odinets, A.N. Orobinskiy

Full Text :   (255 kB, Rus.) 

Abstract
The methods of dead-time measurement are presented: one source method and two sources method; the expressions of the dead-time calculation, errors calculation and sensitivity of measurement instruments of characteristics of ionizing radiations. The methods and criterions of the dead-time model are presented: extended and not-extended. The values of the pulse rates with their minimal measurement errors are defined.

KEY WORDS: dead-time, extended, not-extended, one source method, two sources method, pulse rates, sensitivity.

A CALCULATION OF X-RAY DIFFRACTION ON STRAIN FIELD OF EDGE-DISLOCATIONS

D.G. Malykhin, V.V. Kornyeyeva, M.P. Starolat

Full Text :   (250 kB, Rus.) 

Abstract
The dislocation conception of nonuniform strains in polycrystalline materials which distribution as purposed distinct from normal law and give the tail-like asymptotic of X-ray line shape is examined. A pattern of X-ray diffraction on area of material with edge-dislocations is calculated. An analytic description of elastic strains field of edge-dislocations with "imaging forces" which remove the strains on boundaries of its areas is calculated. It is shown that proposed pattern allows approximating the lines shape of X-ray diffraction on a material with regular- distributed dislocations and obtaining semi-quantitative calculated values of dislocation densities.

KEY WORDS: X-ray analyses, pattern, calculation, dislocations, elastic field, strains, diffraction

DEFECT STRUCTURE, TWEEN BOUNDARIES MORPHOLOGY AND RESISTIVE PROPERTIES OF HTSC 1-2-3 SINGLE CRYSTALS IN A NORMAL STATE

A.A. Zavgorodniy, M.A. Obolenskii, R.V. Vovk, I.L. Gulatis, A.V. Samoylov, A.V. Bondarenko

Full Text :   (750 kB, Ukr.) 

Abstract
In present work of the structural and electroresistive parameters of HTSC 1-2-3 single crystals at replacement of yttrium on holmium and weak (to 5 % ) aluminium dope are investigated. It is shown that, as well as in the case of pure samples, the structure of crystals, after growing from solution-fusion, has a structure near to tetragonal. In the process of additional satiation oxygen is segnetoelastic transition to the orthorhombic phase, that is accompanied by formation of domain tween boundaries structure. The scopes of twins and admixtures of aluminium are the effective centers of dispersion of normal carriers. Tweed structure during concentration of aluminium in y≤0,5 does not appear.

KEY WORDS: HTSC, RеBa₂Cu₃O_7-δ single crystals, tween boundaries, dope, normal carriers

ABOUT THE FRACTALS OF CELLULAR FRONT SINGLE CRYSTALS SOLIDIFICATION OF NIW ALLOYS

V.J. Sverdlov

Full Text :   (2270 kB, Rus.) 

Abstract
The fractals of single crystals front solidification of Ni-W alloys with cellular structure gas been investigated. The structure depends on growth parameters and alloyed elements. The likeness of microscopic and macroscopic solidification fronts as well as cellular fractals have been shown. The parameters of the cellar morphology depend non-linearly on R. It is connected with the changes in the mechanism of energy dissipation on solidification front and the transition from cellar structure to a dendrite one. Alloying favours the increase of intracellar protuberance amplitude and the convexity of macroscopic solidification front.

KEY WORDS: single crystals of Ni-W alloys, cellular structure, microscopic solidification front, macroscopic solidification front, fractals

IMPLEMENTATION OF DATA ACQUISITION SYSTEMS FOR MULTICHANNEL NUCLEAR-PHYSICAL SETUPS ON BASE OF THE UNIX-LIKE OPERATIONAL SYSTEMS

A.Yu. Isupov, V.E. Kovtun, A.G. Foshchan

Full Text :   (1070 kB, Rus.) 

Abstract
Some ideas and principles, used at design of software for data acquisition systems on base of the modern UNIX-like operating systems, are considered. In particular, ones follows: wide using of interprocess and intercomputer interfaces for data transfer, elimination of intermediate storages on HDD, modular structure allows to easy distribute and scale data acquisition system, implementation of typical framework systems, and so on. The comparison of a UNIX-like operating systems and DOS as environments for data acquisition software implementation is done. The framework provided by the ngdp system, which allows to implement a modular distributed systems for data acquisition, transfer, processing, and visualization for various nuclear physics experimental setups with electronic readout, is described. Some used at the Laboratory of High Energies (LHE) of the Joint Institute for Nuclear Research (JINR, Dubna) schemes of ngdp framework based implementation of the data acquisition systems for such setups are explained. A some variant of the data acquisition frameworks future development - the ngdp system - is presented briey.

KEY WORDS: computer, CAMAC, software, operating system, data acquisition.

THE CONCEPT OF RADIATION PORTAL MONITOR OF NEW GENERATION

V.N. Dubina, V.Е. Kovtun

Full Text :   (1165 kB, Rus.) 

Abstract
Radiation Portal Monitors based on plastic scintillator are wide used kind of passive detector. These relatively cheap detectors are very need under nuclear and radioactive materials check at such a checkpoints as airports, state boards, railway crossing et all. Modern monitors have a high enough sensibility to gamma-channel. But a main problem is a false signal due to radiation background fluctuation and cargo. It doesn't allow to certainly identifying the masked radiation source in cargo. The main proposed idea of this article is electron collimation method with plastic scintillators detectors using for radiation source placement definition that means essential background suppression. Due to background suppression and source identification we can to enlarge detector square and achieve registration under very small levels of minimum detectible activity (MDA). Using a plastic of big square and possibility to suppressed background essentially makes high efficensy radiation portal monitor as new generation detector indeed. There is discussion of principle construction and data acquisition system (DAQ). The previous experience that we have got under muon system construction for CDF II (FERMILAB) has taken to account. Monte-Carlo calculation results (by means Geant4 and ROOT5 work up) are presented too.

KEY WORDS: nuclear terrorizm, special nuclear materials, radiation portal monitor, electronical collimation method, time of fligth method, background suppression, coincidence method, plastic scintillator