Subject Categories for JINR Publications
2010
P11-2010-2 (176.182)
Puzynin I.V., Puzynina T.P., Thach V.T.
SLIPM - a MAPLE Package for Numerical Solution of Sturm-Liouville Partial Problems Based on a Continuous Analog of Newton's Method. I. Algorithm

We present the SLIPM (Sturm-LIouville Problem in MAPLE), a program in the language of system computer algebras MAPLE, intended for the numerical solution with the help of continuous analogue of Newton's method (CANM) of Sturm-Liouville partial problems, i.e., for calculating some eigenvalue of linear second-order differential operator and corresponding eigenfunction satisfying homogeneous boundary conditions. SLIPM is development written in the Fortran language of programs SLIP1 and SLIPH4: it is added by a new procedure of calculation of initial approach to the solution {0, y0} and new ways of calculating the initial value of iterative parameter 0.

P10-2010-3 (1.031.099)
Lebedev A.A., Ososkov G.A.
Track Reconstruction in the TRD and MUCH Detectors of the CBM Experiment

Track reconstruction algorithm and its applications to the TRD and MUCH tracking detectors of the CBM experiment are described. The main components of the reconstruction package include track finding, fitting and propagation in the detector. The track finding algorithm is based on the track following method with branches. Track propagation algorithm takes into account inhomogeneous magnetic field and includes accurate calculation of multiple scattering and energy losses in the detector material. Track parameters and covariance matrices are estimated using the Kalman filter method. Developed software was included into the experiment software framework. Performance of the algorithm which shows its efficiency is presented.

E6-2010-4 (823.891)
Tereshatov E.E., Bruchertseifer H., Voronyuk M.G., Starodub G.Ya., Petrushkin O.V., Dmitriev S.N.
Isocratic Anion Exchange Separations of Group V Elements

The present study has been performed within the framework of experiments aimed at the investigation of chemical properties of long-lived Db isotopes in aqueous solutions. The isocratic anion exchange separations of group V elements in the solutions containing HF have been considered. A possibility in principle of niobium and tantalum separation in the system HF/NH4F has been shown. Parameters of separation of dubnium homologues (Ра, Nb and Ta) in HF/HNO3 mixed solutions have been optimized. The procedure of separation of group V elements from multicomponent system has been suggested.

P11-2010-8 (560.511)
Atanasova P.Ch. et al.
Numerical Modeling of Long Josephson Junctions in the Framework of Double Sine-Gordon Equation

The aim of this work is a mathematical modeling of the static magnetic flux distributions in long Josephson junctions (JJ) taking into account the second harmonic in the Fourier decomposition of the Josephson current. Stability analysis is based on numerical solution of a spectral Sturm-Liouville problem formulated for each distribution. In this approach the nullification of the minimal eigenvalue of this problem indicates a bifurcation point in one of parameters. At each step of numerical continuation in parameters of the model, the corresponding nonlinear boundary problem is solved on the basis of the continuous analog of Newton's method with the spline-collocation discretization of linearized problems at Newtonian iterations. Main solutions of the double sine-Gordon equation have been found. Stability of magnetic flux distributions has been investigated. Numerical results are compared with the results of the standard JJ model.

P11-2010-11 (113.201)
Bunetsky O.O. et al.
Preparation of NSC KIPT and JINR Grid-Infrastructures for Data Analysis at the CMS Experiment (CERN)

At the running phase of the LHC experiments the requirements on computing centers for the LHC experiments, including CMS, are very strict because it would be necessary to process a huge amount of data at very high speed. For these purposes, a special distributed global grid-infrastructure named WLCG has been constructed. JINR LIT and "Kharkov Institute of Physics and Technology" (NSC KIPT) computing centers, intergarted into the WLCG infrastructure and certified at the CMS experiment as CMS Tier2 centers, demonstrate a high level of reliabilty at their operation. These centers' computing resources are mostly dedicated for analysis of CMS data. A proper WLCG elements configuration at JINR LIT and NSC KIPT grid-sites (especially Storage Elements) should be provided and actual versions of CMS specialized software should be supported to make possible the reconstruction and analysis of data registered by the CMS detector. Readiness of JINR LIT and NSC KIPT computing centers to the LHC start-up is discussed and the results of scale testing of JINR LIT and NSC KIPT grid-sites are presented.

P15-2010-16 (147.851)
Gangrsky Yu.P., Zhemenik V.I., Markov B.N., Myshinsky G.V.
The Yield Ratio of I and Xe Isotopes in the Photofission Fragments of Heavy Nuclei

The ratios of I cumulative yields and Xe independent ones were measured in the photofission of 232Th, 238U, 237Np, 243Am and 248Cm nuclei by the bremsstrahlung radiation of 25 MeV boundary energy. The selective gas transport and -ray spectra measurements were used. A large difference, from 34 for 238U up to 1.3 for 243Am, was observed. This difference is discussed on the basis of modern models for fission fragments formation.

P13-2010-21 (277.780)
Pepyolyshev Yu.N., Popov A.K.
Limits of Safe Perturbations of External Reactivity of the IBR-2 Reactor

For the IBR-2 pulsed reactor the limits of safe perturbations of reactivity have been defined by mathematical simulation of the reactor dynamics. It has been shown that during the reactor operation there occurs a continuous narrowing of the region of permissible perturbations of reactivity in the presence of significant fluctuations of its limit. The safety limit for some kinds of reactivity perturbations during 20 years of the reactor operation has decreased by more than 3 times. The reduction of the region of permissible fluctuations of reactivity is connected with a gradual decay of the fast power feedback. It has been demonstrated that the most probable reason for this phenomenon is an increase in the positive component of the feedback due to a change in thermo-mechanical deformations of the fuel elements in the course of energy production. It has been noted that even in view of the continuous narrowing of the safety limit a standard system of automatic control of the reactor reliably ensures its safe operation.

E15-2010-23 (521.713)
J. Adam, A.A. Solnyshkin, M. Stefanik, V. M. Tsoupko-Sitnikov, L. Zavorka, V. Kumar, Chitra Bhatia, Aruna Bhart, S.K. Gupta
A Feasibility Study of Nonelastic Reactions in Thorium and Uranium by the Spallation Neutrons

Neutron absorption and fission reactions play an important role in a conventional reactor but when fuel is irradiated by the spallation neutrons then a number of nonelastic reactions will play significant role in both multiplication of neutrons and fission reactions. In theoretical study it has been revealed that the fertile and fissile fuels have a different behavior in this respect. Thus, it is imperative to understand the feasibility of such reactions taking place in the fertile and fissile fuel elements before conducting experiment at Phasotron. In the present study it is found that many nonelastic reactions producing fragments or residuals of half-lives greater than several tens of minutes can be studied using the off-line gamma spectrometry. A large amount of samples can be irradiated with the spallation neutrons produced in 660 MeV proton +Pb collision. A tentative design of the experimental setup is also suggested for the experiment at Phasotron.

E14-2010-26 (537.382)
D.P. Kozlenko, N.T. Dang, Z. Jirak, S.E. Kichanov, E.V. Lukin, B.N. Savenko, L.S. Dubrovinsky, C. Lathe
Structural and Magnetic Phase Transitions in Pr0,15Sr0,85MnO3 at High Pressure

The crystal and magnetic structures of Pr0,15Sr0,85MnO3 manganite have been studied by means of powder X-ray and neutron diffraction in the temperature range 10-400 K at high external pressures up to 55 and 4 GPa, respectively. A structural phase transition from cubic to tetragonal phase upon compression was observed, with large positive pressure coefficient of transition temperature dTct/dP = 26(2) K/GPa. The C-type antiferromagnetic (AFM) ground state is formed below TN ~ 280 K. While at ambient pressure the structural and magnetic transition temperatures coincide, Tct ~ TN, upon compression they become decoupled with TN « Tct due to much weaker TN-pressure dependence with coefficient dTN/dP = 3.8(1) K/GPa.

P12-2010-27 (308.363)
Maslov O.D. et al.
Uranium Extraction from the Waste Ash after Burning the Mongolian Coal

The content of natural radionuclides, as well as possibility of uranium leaching from the brown coal ash of the Mongolian Thermal Power Plant, was determined. Instrumental Gamma Activation Analysis (IGAA) and X-Ray Fluorescence Analysis (RFA) for determination of the element contents were used. Leaching of uranium from the brown coal ash was carried out by the 8 М HNO3+HF (10%) mixture. Extraction of uranium from solution and separation from contiguous elements were carried out by ion-exchange resin. The natural radioelements 238U, 232Th and products of their decay were absent in the ash sample after leaching, which allows using the brown coal ash as building material.

P3-2010-29 (959.957)
Yurevich V.I., Yakovlev R.M., Lyapin V.G.
Neutron Production in Interaction of 2-GeV Protons with Nuclei

Neutron production double differential cross sections for reactions of 2-GeV protons with the nuclei Be, Al, Cu, Cd and Pb have been measured by the TOF method in the angular range above 30°. The experimental data analysis is performed in the framework of a phenomenological model with four moving sources including neutron emission in the first nucleon-nucleon collisions, a hot source (fireball) decay, multifragmentation and de-excitation of nuclear fragments by neutron evaporation. The magnitudes of temperature parameters for all the sources are universal and practically do not depend on the target nucleus and incident particle energy in the region above 0.5 GeV. It is found that relative contribution of the hot source decay and multifragmentation to the mean neutron multiplicity in the reactions is about 41%.

P16-2010-31 (558.493)
Brabcova K. et al.
LET Spectrometry of the Clinical 12C Ion Beam

The sets of track etched detectors for the linear energy transfer (LET) spectrometry were exposed in 12C 290 MeV/amu natural and modified ion beams at the HIMAC installation at NIRS, Chiba, Japan. LET spectra were measured at various depths in 12C-ion beams with expected LET values of primary particles from 13 keV/mm in water, through the Bragg peak area up to the region of fragmentation behind the Bragg peak.
LET spectra measured with one type of used track etched detectors, Page, along the beams axis at the depth up to the region behind the Bragg peak are presented.
The dosimetric values calculated from measured LET spectra are given. The depth distributions of absorbed dose and biological weighted effective dose for radiation therapy are calculated. Relative biological weighted efficiency of 12C beams at the various depths is estimated. The depth-dose distribution calculated from LET spectra is in a good agreement with reference measurements in HIMAC.


E13-2010-32 (500.674)
N. Anfimov, I. Chirikov-Zorin, A. Dovlatov, O. Gavrishchuk, A. Guskov, N. Khovanskiy, Z. Krumshtein, R. Leitner, G. Meshcheryakov, A. Nagaytsev, A. Olchevski, T. Rezinko, A. Sadovskiy, Z. Sadygov, I. Savin, V. Tchalyshev, I. Tyapkin, G. Yarygin, F. Zerrouk
Novel Micropixel Avalanche Photodiodes (MAPD) with Superhigh Pixel Density

In many detectors based on scintillators the photomultiplier tubes (PMTs) are used as photodetectors. At present photodiodes are finding wide application. Solid state photodetectors allow operation in strong magnetic fields that are often present in applications, e.g., some calorimeters operating near magnets, combined PET and MRT, etc. The photon detection efficiency (PDE) of photodiodes may reach values a few times higher than that of PMTs. Also, they are rigid, compact and have relatively low operating voltage. In the last few years Micropixel Avalanche PhotoDiodes (MAPDs) have been developed and started to be used. The MAPD combines a lot of advantages of semiconductor photodetectors and has a high gain, which is close to that of the PMT. Yet, they have some disadvantages, and one of them is a limited dynamic range that corresponds to a total number of pixels. The novel deep microwell MAPD with high pixel density produced by Zecotek Company partially avoids this disadvantage. In this paper characteristics of these photodetectors are presented in comparison with the PMT characteristics. The results refer to measurements of the gain, PDE, cross-talks, photon counting and applications: beam test results of two different "Shashlyk" EM calorimeters for COMPASS (CERN) and NICA-MPD (JINR) with the MAPD readout and a possibility of using the MAPD in PET.

E10-2010-34 (847.088)
Isupov A.Yu.
The ngdp Framework for Data Acquisition Systems

The ngdp framework is intended to provide a base for the data acquisition (DAQ) system software. The ngdp's design key features are: high modularity and scalability; usage of the kernel context (particularly kernel threads) of the operating systems (OS), which allows one to avoid preemptive scheduling and unnecessary memory-to-memory copying between contexts; elimination of intermediate data storages on the media slower than the operating memory like hard disks, etc. The ngdp, having the above properties, is suitable to organize and manage data transportation and processing for needs of essentially distributed DAQ systems.

E10-2010-35 (196.237)
Isupov A.Yu.
CAMAC Subsystem and User Context Utilities in ngdp Framework

The ngdp framework advanced topics are described. Namely we consider work with CAMAC hardware, "selfflow" nodes for the data acquisition systems with the As-Soon-As-Possible policy, ng_mm(4) as an alternative to ng_socket(4), the control subsystem, user context utilities, events representation for the ROOT package, test and debug nodes, possible advancements for netgraph(4), etc. It is shown that the ngdp is suitable for building lightweight DAQ systems to handle CAMAC.

E14-2010-37 (154.163)
McIntyre G. et al.
Modulated Crystal Structures of VII and V Phases in (NH4)3H(SO4)2. I. Neutron Laue Diffraction

The study of crystal structures of VII and V phases of (NH4)3H(SO4)2 by means of neutron Laue diffraction is carried out at temperatures from 5 to 300 K. It is found that crystal structures of VII and V phases have incommensurate modulation with different periods, and phase transition from phase VII to phase V is transition of the first type.

P16-2010-38 (234.644)
Gryzinski M.A.
Determination of the Radiation Quality Factor at the Proton Beam with a Recombination Chamber

Radiation quality factor at the real session on proton therapy and the contribution of the high LET particles to dosimetric characteristics of the 170 MeV clinical proton beam were experimentally studied using ionization recombination chamber KR-13. Chamber electrodes were elaborated of tissue-equivalent material containing 10.5% hydrogen, 86% carbon and 3.5% nitrogen in weight filled with ethane at pressure of 0.7 MPa.
The contribution of high LET particles to absorbed dose has been determined. It was d2 = (30.8±3)% in the spread out Bragg peak.
Radiation quality factor in the region of the Bragg peak was Q=(4±0.4) Sv/Gy and at the entrance was Q = (1.6±0.2) Sv/Gy.


P16-2010-41 (652.581)
Ryom Kwang Chol, Shabalin E.P.
Possibility Research to Use a Passive Type Feeder for the Pelletized Cold Neutron Moderator of the IBR-2M Pulsed Reactor

The investigation of the behavior of balls in a passive feeder (of a sandwatch type) for the prospective cold moderator of the IBR-2M pulsed reactor on the basis of the PFC-3D program intended for the analysis of multiparticle problems with the so-called DEM method has been carried out. Numerical experiments have shown that no jams of the flow of 4 mm balls occured, provided that the diameter of a discharging tube is more than 13 mm. And it is also shown that balls of the boundary layer come out of the feeder at 1.3-1.4 times more slowly than balls of the central position. Eventually, special geometry and sizes of the discharging tube ensuring needed (in view of admissible residence time of methane in a moderator chamber) flow rate of balls 1-1.2 balls per second are obtained.

P5-2010-44 (146.579)
Shlyk V.A.
Decision Problems for Some Classes of Integer Partitions and Number Multisets

We show that the class of integer partitions that cannot be represented as convex combinations of two partitions of the same numbers coincides with the class of knapsack partitions and the class of Sidon multisets, which includes sum-free sets and standard Sidon sets. The decision problem for knapsack partitions is proved to be co-NP-complete and, therefore, cannot be solved in polynomial time unless P = NP.

P14-2010-45 (382.629)
Mamedov T.N. et al.
Search for Magnetic-Ordered Phase Zn0.99Co0.01O by the mSR-Method

The behavior of the negative muon polarization was studied to search for possible magnetic ordered phase in Zn0.99Co0.01O. The sample was produced by solid-phase reaction method by using ZnO и Co3O4. Measurements were performed in transverse magnetic field 1.5 kG in the temperature range 5-300 K and in zero external magnetic field at temperature 6 K. There were not observed any evidences for the long-range magnetic order.

E14-2010-50 (328.520)
T.N. Mamedov, V.D. Blank, V.N. Gorelkin, K.I. Gritsaj, M.S. Kuznetsov, S.A. Nosukhin, V.G. Ralchenko, A.V. Stoykov, R. Scheuermann, S.A. Terentiev
Behaviour of Muonium in Synthetic Diamond

The probabilities of finding the muon in various states in synthetic single-crystal and polycrystalline diamond were studied. In the IIa-type single-crystal sample at 150 K the contributions of the diamagnetic muon, "normal" and "anomalous" muonium were observed to be 1.5, 57 and 8.1, respectively. The missing fraction of muon polarization was 33.4, which is approximately two times smaller than in the Ia-type natural diamond, and two or three times greater than in the IIa- and IIb-type natural diamonds. The muon spin relaxation rates at the "normal" and "anomalous" muonium states in the synthetic and natural samples of IIa- and IIb-type are similar.

E6-2010-53 (356.039)
Izosimov I.N., Kalinnikov V.G., Solnyshkin A.A.
Fine Structure of the Strength Function for the b+/EC Decay of the 160mHo (5.02 h) Isomer

The strength function for the b+/EC decay of the deformed nucleus of the 160mHo (5.02 h) isomer is obtained from the experimental data. The fine structure of the strength function Sb(E) is analyzed. It has a pronounced resonance structure for Gamow-Teller transitions and is found to exhibit a resonance structure for first-forbidden transitions. It is shown that for some excitation energies of the 160Dy daughter nucleus the probability of first-forbidden b+/EC transitions in the decay of the 160mHo isomer is comparable with the probability of Gamow-Teller b+/EC transitions.

E1-2010-54 (378.823)
Tokarev M.V. (on behalf of the STAR Collaboration)
High-pT Spectra of Charged Hadrons in Au+Au Collisions at =9.2 GeV in STAR

The production of hadrons in heavy-ion collisions at high pT provides an important information on mechanism of particle formation and constituent energy loss in medium. Such information is needed for search of a critical point and signatures of phase transition. Measurements by the STAR Collaboration of charged hadron production in Au+Au collisions at =9.2 GeV over a wide transverse momentum pT=0.2-4 GeV/c and at mid-rapidity range are reported. The first measurements of the spectra of charged hadrons at high pT at this energy are presented. The spectra demonstrate the dependence on centrality which enhances with pT. The constituent energy loss and its dependence on transverse momentum of particle and centrality of collisions are estimated in the z-scaling approach.

P14-2010-55 (222.836)
Semina V.K.
Modification of Magnetic Structure and Properties of Metallic Alloys Using Heavy Ion Irradiation

Based on own experimental and published data on modification of magnetic structure and properties of metallic alloys under heavy ion irradiation the possibility was shown to create defined laminated and two-dimensional magnetic structures.

P13-2010-57 (812.430)
Budagov J. et al.
Cylindrical Niobium - Stainless Steel Transition Element Manufactured by Explosion Welding

New results in development of the Nb+stainless steel (SS) bimetallic transition elements for the helium Vessel of the fourth-generation ILC cryomodule are presented. Various schemes are considered for explosion welding of the Nb+SS transition element, and two schemes proposed by JINR are adopted: with inner cladding and with outer cladding. A new technology is optimized for explosion welding of the necessary niobium and stainless steel components, and four test specimens of the transition elements are made. Preliminary tests in vacuum with thermal cycling in liquid nitrogen and exposure to ultrasound were carried out in Sarov (RFNC) and Pisa (INFN). Macro- and microanalyses were also given to the specimens. The tests showed satisfactory characteristics of the Nb+SS joints. The leak rate measured in Sarov was Q 10-9 atm · cm3/s. In Pisa, after thermal cycling and exposure to ultrasound, the upper limit of the leak rate for all test joints was found to be Q 3-5 · 10-10 atm · cm3/s. The transition elements will be tested at the helium temperature (1.8 K) at FNAL (USA).

P13-2010-58 (441.077)
Kim Tae Gyoun, Pepyolyshev Yu.N., Rogov A.D.
Thermal Analysis Methods of a Fuel Rod in IBR-2 Pulsed Reactor

The problem of transient temperature distribution in a fuel rod of the reactor IBR-2 is considered: in fuel (in rod-shaped pellet and in hollow-shaped pellet), in cladding of the fuel rod, and also in liquid sodium coolant surrounding a fuel rod. For analyzing transient thermal behaviour of a fuel rod, a program for numerical solving of heat conduction equation in cylindrical coordinates system by applying finite difference method to the equations of one-dimensional transient problem of heat conduction is created. The program is written on the basis of the algorithms used in programs FEMAXI, FRAPTRAN and FRAPCON, but has essential difference from them as it is focused on thermal physics of fast reactors of IBR-2 type with plutonium fuel and sodium coolant with research possibility of very rapid thermal processes up to microsecond duration. The solution algorithms of transient thermal behaviour used in the program and their implementation technique are shortly described.

P13-2010-59 (300.590)
Kim Tae Gyoun, Pepyolyshev Yu.N., Rogov A.D.
Thermal Analysis of a Fuel Rod in IBR-2 Pulsed Reactor (Steady-State Problem)

Computational results of a thermal analysis for a fuel rod of fast pulsed reactor IBR-2 with plutonium as fuel and liquid sodium as coolant are presented. The maximum temperature in the center of rod-shaped fuel subjected to maximum thermal load (137.52 W/cm) and to average thermal load (109.31 W/cm) is 1135 and 948 oC, respectively. And the maximum temperature on an inner surface of hollow-shaped fuel subjected to maximum thermal load is 944 oC. The maximum temperature of a coolant on the output of the coolant channel with a fuel rod subjected to maximum thermal load is 398 oC and the heating of coolant is 108 oC. Only thermal analysis of a steady-state fuel rod is presented.

E1-2010-61 (878.034)
J.Adam, A.Baldin, N.Vladimirova, N.Gundorin, B.Gus'kov, V.Dyachenko, A.Elishev, M.Kadykov, E.Kostyuhov, V.Krasnov, I.Mar'in, V.Pronskikh, A.Rogov, A.Solnyshkin, V.Stegailov, S.Stetsenko, S.Tyutyunnikov, V.Furman, V.Tsoupko-Sitnikov E.Belov, M.Galanin, V.Kolesnikov, N.Ryazansky, S.Solodchenkova, B.Fonarev, V.Chilap, A.Chinenov, E.Baldina, A.Balabekyan, G.Karapetyan, I.Zhuk, S.Korneev, A.Potapenko, A.Safronova, V.N.Sorokin, V.V.Sorokin, A.Khilmanovich, B.Marcynkevich, T.Korbut, Ch.Stoyanov, L.Kostov, P.Zhivkov, O.Yordanov, S.Batzev, Ch.Protohristov, A.Kugler, V.Wagner, M.Majerle, A.Krasa, O.Svoboda, K.Katovsky, O.Schasny, A.Tuleushev, K.Gudima, M.Baznat, R.Togoo, D.Otgonsuren, Ts.Tumendelger, Ts.Damdinsuren, M.Shuta, E.Strugalska-Gola, S.Kilim, M.Bielevicz, A.Wojeciechowsky, V.Voronko, V.Sotnikov, V.Sidorenko, I.Haysak, S.R.Hashemi-Nezhad, Y.Borger, W.Westmeier, H.Robotham, W.Ensinger, D.Severin, M.Rossbah, B.Thomauske, M.Zamani, M.Manolopoulou, St.Stoulos, M.Fragopolou, St.Jokic, H.Kumawat, V.Kumar, M.Sharma
Study of Deep Subcritical Electronuclear Systems and Feasibility of Their Application for Energy Production and Radioactive Waste Transmutation

Представлено физическое обоснование для продолжения и развития исследований новых схем электроядерного метода для производства энергии и трансмутации долгоживущих компонентов радиоактивных отходов (РАО), основанного на ядерных релятивистских технологиях (ЯРТ). Проект "Энергия и трансмутация РАО" нацелен на комплексное исследование взаимодействий релятивистских пучков нуклотрона-М с энергиями до 10 ГэВ в квазибесконечных мишенях.
На основе анализа результатов известных экспериментальных и расчетно-теоретических работ показано, что в рамках предлагаемой схемы можно рассчитывать на использование природного/обедненного урана или тория для производства энергии без добавления урана-235. Также возможна утилизация отработанных ядерных элементов атомных электростанций.
Показано, что выполнение проекта "Энергия и трансмутация РАО" даст возможность получить принципиально новые, отсутствующие в настоящее время совокупные данные и расчетные методы, необходимые для начала проектирования демонстрационных опытно-промышленных установок на основе этой схемы.


E17-2010-062 (860.034)
Vladimirov A.A., Ihle D., Plakida N.M.
Dynamic Spin Susceptibility of Superconducting Cuprates: A Microscopic Theory of the Magnetic Resonance Mode

A microscopic theory of the dynamic spin susceptibility (DSS) in the superconducting state within the t-J model is presented. It is based on an exact representation for the DSS obtained by applying the Mori-type projection technique for the relaxation function in terms of Hubbard operators. The static spin susceptibility is evaluated by a sum-rule-conserving generalized mean-field approximation, while the self-energy is calculated in the mode-coupling approximation. The spectrum of spin excitations is studied in the underdoped and optimally doped regions. The DSS reveals a resonance mode (RM) at the antiferromagnetic wave vector Q = p(1,1) at low temperatures due to a strong suppression of the damping of spin excitations. This is explained by an involvement of spin excitations in the decay process besides the particle-hole continuum usually considered in random-phase-type approximations. The spin gap in the spin-excitation spectrum at Q plays a dominant role in limiting the decay in comparison with the superconducting gap which results in the observation of the RM even above Tc in the underdoped region. A good agreement with inelastic neutron-scattering experiments on the RM in YBCO compounds is found.

P3-2010-63 (113.735)
Alexandrov Yu.A.
On the Interaction between the Neutron and the Electron. Connection with the Yukawa Meson Theory

It would be desirable to underline once again that the n-e scattering length value, which is -1.30(3)·10-16 cm, contradicts the Yukawa meson theory and -1.60(4)·10-16 cm is in agreement with it. Unfortunately, practically nobody pays attention to this fact.
Because of a considerable number of difficult-to-estimate corrections, the future experiments on the measurement of the n-e scattering length should be performed at a rather big relative contribution of the sought-for length to the measured value.


P14-2010-65 (268.259)
Krivandin A.V. et al.
Study of -Crystallin Structure by Small-Angle Neutron Scattering with Contrast Variation

The structure of the oligomeric protein -crystallin from the bovine eye lens has been investigated by small-angle neutron scattering (SANS) by the contrast variation method (volume fraction of D2O was 0, 23, 68 and 90%). Experiments were carried out on YuMO spectrometer (IBR-2 reactor, JINR). From the SANS curves the match point for -crystallin (43% D2O) and its average scattering length density at this point (2.4 · 1010 cm-2) have been obtained. The radius of gyration and distance distribution functions for -crystallin have been calculated as well. On the basis of these calculations it was concluded that -crystallin has a homogeneous distribution of the scattering density in domains inaccessible for water penetration and all parts of this protein undergo a uniform deuteration. The latter indicates that all -crystallin subunits have an equal accessibility for water and presumably for some other low molecular weight substances. These conclusions on the -crystallin structure (a homogeneous distribution of the scattering density and an equal accessibility of all subunits for low molecular weight substances) should be taken into account in the time of elaboration of -crystallin quaternary structure models.

P9-2010-68 (1.044.998)
Averichev et al.
Results of 40th and 41st Nuclotron

Main results of the works in the frame of the Nuclotron-M project fulfilled in the period from July 2009 till April 2010 are presented. General attention is devoted to the results of 40th and 41st Nuclotron runs performed from 18 November to 11 December 2009 and from 25 February to 25 March 2010 correspondingly. ost sufficient achievement of the 41st run was successive acceleration and extraction of Xe ions.

P13-2010-69 (449.269)
Bazylev S.N. et al.
A Prototype Coordinate Detector Based on Granulated Thin-Walled Drift Tubes

A prototype detector based on thin-walled segmented tubes was developed and its parameters were studied in JINR and on SPS (CERN). The detector contains 360 registration channels with a diameter of 4 mm. The prototype's granularity is 4 сm2 and the insensitive length in the region of straw internal elements is less than 5% of its full sensitive area. The time and spatial parameters of the detector do not differ from those of ordinary track detectors based on drift tubes.

E18-2010-71 (439.959)
Luu Viet Hung, O.D.Maslov, Dang Duc Nhan, Trinh Thi Thu My, Phung Khac Nam Ho
Uranium Uptake of Vetiveria zizanioides (L.) Nash

Uranium uptake of vetiver grass Vetiveria zizanioides (L.) Nash) from Eutric Fluvisols (AK), Albic Acrisols (BG), Dystric Fluvisols (HP) and Ferralic Acrisols (TC) in northern Vietnam is assessed. The soils were mixed with aqueous solution of uranyl nitrate to make soils contaminated with uranium at 0, 50, 100, 250 mg/kg before planting the grass. The efficiency of uranium uptake by the grass was assessed based on the soil-to-plant transfer factor (TFU, kg · kg-1). It was found that the TFU values are dependent upon the soils properties. CEC facilitates the uptake and the increased soil pH could reduce the uptake and translocation of uranium in the plant. Organic matter content, as well as iron and potassium, inhibits the uranium uptake of the grass. It was revealed that the lower fertile soil, the higher uranium uptake. The translocation of uranium in root for all the soil types studied is almost higher than that in its shoot. It seems that vetiver grass could potentially be used for the purpose of phytoremediation of soils contaminated with uranium.

E10-2010-73 (689.308)
Akishina T.P., Derenovskaya O.Yu., Ivanov V.V.
Study of the Electron Energy Losses in the CBM TRD

We analyze the distributions of energy losses for electrons in the TRD (Transition Radiation Detector) using the energy deposits in a one-layer TRD prototype obtained during the test beam at the GSI (Darmstadt, February 2006) and Monte Carlo simulations for the n-layered TRD realized in the framework of the CBM ROOT for momenta in the range of 1 to 13 GeV/c. The procedure for approximation of the electron energy losses in one layer of the TRD is developed. This procedure permits one to extract a transition radiation part from the real measurements and compare it with the Monte Carlo simulation.

E15-2010-74 (298.622)
Baluev V.V. et al.
Experimental Search for the Radiative Capture Reaction d + d 4He + from the dd Muonic Molecule State J = 1

A search for the muon catalyzed fusion reaction d + d 4He + in the dd muonic molecule was performed using the experimental installation TRITON with BGO detectors for quanta. The high-pressure target filled with deuterium was exposed to the negative muon beam of the JINR Phasotron to detect quanta with the energy of 23.8 MeV. An experimental estimation for the yield of radiative deuteron capture from the dd state J = 1 was obtained at a level per fusion.

P1-2010-75 (825.313)
Zarubin P.I. (on behalf of the BECQUEREL Collaboration)
Peripheral Fragmentation of Relativistic Nuclei

The modern concepts of nucleon clustering are described in brief. The application of experimental methods of relativistic nuclear physics for the development of nucleon cluster physics is presented. A short review of research performed by the nuclear emulsion technique is given. The significance of observations of coherent dissociation of relativistic nuclei for the study of nuclear clustering is discussed. According to observations in nuclear emulsion, the degree of coherent dissociation may reach complete dissociation both for light nuclei O, Ne, Mg and Si, and for heavy nuclei Au, Pb and U. This phenomenon may be a source of cluster systems of unprecedented complexity. Pattern of coherent dissociation for a large variety of nuclei, adjacent to the beginning of the table of isotopes, including radioactive ones, is studied.

P13-2010-76 (663.863)
Piyadin S.M. et al.
E-E Detector for the Registration of the Protons from the Deuteron Nonmesonic Breakup Reaction at Internal Target at Nuclotron-M

The design of E-E detector for study of the deuteron breakup reaction at the internal target at Nuclotron-M in the deuteron energy interval 300-500 MeV is presented. The high voltage power system for PMTs-63 that is managed by Wenzel Electronik module with the computer control is shortly described. The light-emitting diode monitoring of the E-E detector's work is considered. The results of the E-E detector tests with cosmic muons and deuterons at Nuclotron are presented.

P1-2010-77 (477.560)
Yurevich V.I., Yakovlev R.M., Lyapin V.G.
Neutron Production in Collisions of 2 A GeV Carbon Nuclei with C, Al, Cu, Cd and Pb Nuclei

Neutron production double-differential cross sections were measured by time-of-flight method for interactions of carbon nuclei with energy of 2 GeV/nucleon with C, Al, Cu, Cd and Pb nuclei. The measurements were carried out for angles 30, 53 and 90o in interval of neutron energies from hundred keV to 300 MeV. A phenomenological model of four moving sources is applied for analysis of the experimental results and estimation of contributions to the neutron emission from different reaction stages. The temperature parameters, obtained on the neutron energy spectrum slope, are (222) MeV for the hot source, fireball, and (4.50.3) MeV for the stage of thermal fragmentation of highly excited heavy remnants. The relative contribution of these two sources to total neutron yield does not depend on target nucleus and in average it is ~ 42%.

P4-2010-79 (250.214)
Gusev A.V.
Electrical Field of Magnetized Sphere and Unipolar Induction

At rotation of a ball, magnetized lengthwise axis of rotation passing through its center, a magnetic field produced by this ball does not change in time neither in value, nor in a direction. Is it possible in this case to speak that the field is rotated together with the magnet? How should one resolve a visible inconsistency between observation of EMF in a unipolar generator and the Faraday induction law, which suggests that EMF = -d/dt = 0, when = const? On the basis of the classic Maxwell theory, equations of lines of force of an electrical field, derived at rotation of such a ball, are deduced and their picture is built. The opinion of some specialists is criticized that the magnetic field of such a ball is rotated together with a ball and creates outside of it an electrical field with the special properties contradicting the classic Maxwell theory.

P13-2010-81 (2.041.619)
Batusov V.Yu., Lyablin M.V., Topilin N.D.
The Development and Application of Hardware-Software for the Controlled Assembly of ATLAS Hadron Tile Calorimeter

The article contains developed by the authors hardware-software complex and geometry control methods of the main constituent elements and final assembly of the hadron tile calorimeter. The developed complex was used at all stages of the calorimeter creation and allowed one to reach high-design precision when creating the world largest research ATLAS spectrometer.

E4-2010-83 (138.453)
Ignatovich F.V., Ignatovich V.K.
An Experiment on a Ball-Lightning Model

We discuss total internal reflection (TIR) from an interface between glass and gainy gaseous media and propose an experiment for strong light amplification related to investigation of a ball-lightning model.

E13-2010-84 (775.938)
Balagurov A.M. et al.
Neutron Diffraction Potentialities at the IBR-2 Pulsed Reactor for Nondestructive Testing of Structural Materials

Neutron diffraction is widely used for investigations of residual and applied stresses in bulk materials and components. The most important factor in these investigations is the high penetration depth of neutrons (up to 2 cm for steel). At the IBR-2 pulsed reactor in Dubna the Fourier stress diffractometer (FSD) has been constructed to optimize the internal stress measurements. The FSD design satisfies the requirements of high luminosity, high resolution and specific sample environment. The collimator system guarantees a minimum gauge volume of 2 2 2 mm. A mechanical testing machine allows in-situ tension or compression measurements up to a load of 20 kN and sample temperatures up to 800 oC. In the paper the current status of FSD is reported and potentialities are demonstrated with several examples of investigations performed.

E2-2010-85 (104.404)
Beshtoev Kh.M.
Is Neutrino Produced in Standard Weak Interactions a Dirac or Majorana Particle?

This work considers the following problem: what type (Dirac or Majorana) of neutrinos is produced in standard weak interactions? It is concluded that only Dirac neutrinos but not Majorana neutrinos can be produced in these interactions. Then neutrino interacts with W and Z bosons but neutrinoless double beta decay is absent. It means that this neutrino will be produced in another type of interaction. Namely, Majorana neutrino will be produced in the interaction which differentiates spin projections but cannot differentiate neutrino (particle) from antineutrino (antiparticle). Then neutrino will interact with W bosons and neutrinoless double beta decay will arise. But interaction with Z boson will be absent. Such an interaction has not been discovered yet. Therefore, experiments with very high precision are important to detect the neutrinoless double decays if they are realized in the Nature.

E6-2010-86 (416.679)
Bunatian G.G., Nikolenko V.G., Popov A.B.
The Usage of Electron Beam to Produce Radio Isotopes through the Uranium Fission by -Rays and Neutrons

We treat the production of desirable radio isotopes due to the 238U photo-fission by the bremsstrahlung induced in converter by an initial electron beam provided by a linear electron accelerator. We consider as well the radio isotope production through the 238U fission by the neutrons that stem in the 238U sample irradiated by that bremsstrahlung. The yield of the most applicable radio isotope 99Mo is calculated. We correlate the findings acquired in the work presented with those obtained by treating the nuclear photo-neutron reaction. Menace of the plutonium contamination of an irradiated uranium sample because of the neutron capture by 238U is considered. As we get convinced, the photo-neutron production of radio isotopes proves to be more practicable than the production by the uranium photo- and neutron-fission, both methods are certain to be brought into action due to usage of the electron beam provided by modern linear accelerators.

P13-2010-89 (417.285)
Mechtiyeva R.N. et al.
Calculation of the Effective Delayed Neutron Fraction and Prompt Neutron Lifetime in the IBR-2M Reactor

Calculation of main kinetic parameters for the reactor IBR-2M is carried out: the effective delayed neutron fraction and the prompt neutron lifetime. The calculation is based on the use of DORT, a two-dimensional multi-group program for resolving of neutron transport equation, and SCALE4 programs for generating multi-group nuclear cross-sections. Calculation values of kinetic parameters for IBR-2M in a regular mode of its work are obtained: eff = 0.00216 0.00007, = 6.5 10-8 s, = 0.980, = 3.50 104 s-1. The parameters and are ~ 0.2% and ~5.0% greater than for IBR-2 (эф = 0.00216 and = (6.20.2) 10-8 s). It is shown that eff and increase with reduction of the size of the active zone. Also, it is noted that for calculation of prompt neutron lifetime it is necessary to use the S16-approximation.

P13-2010-91 (289.768)
Kim Tae Gyoun, Pepyolyshev Yu.N., Rogov A.D.
Thermal Analysis of a Fuel Element in the IBR-2 Pulsed Reactor (Pulse Regime)

In the work computational results on transient temperature fields in a fuel rod of the IBR-2 reactor at the rated power 2 MW and frequency of repetition of impulses 5 s-1 are presented. And also in case of generation of power impulses from the zero moment, the heating process of a fuel rod is considered. Calculations have shown the following. The heating on an inner surface of hollow-shaped pellet under maximum thermal-loaded condition does not exceed 18 oC, and average heatings on radius in the centre of a fuel rod and on fuel volume in this fuel rod are 17.9 and 14.2 oC, respectively. Pulsations of the average temperature of coolant at the exit from the active zone and cladding of a fuel rod during a pulse are small and equal to 0.2 and 1.1 oC, respectively. The value of thermal inertia of a fuel rod is equal to 8.94 s and well coincides with the experimental estimation of the time constant of the basic component in the power feedback. It is emphasized that the time of achievement of thermal balance in a fuel rod is not greater than 50 s.

E13-2010-92 (546.231)
Budagov J. et al.
Investigations on Helicoflex Gaskets for ILC Cavity Flanges

A reliable joint of the Nb superconducting cavities is achieved due to the use of the conical Nb-Ti flanges together with a Quick Disconnect System (from the Garlock company). The joint was tested at room temperature and liquid nitrogen temperature (77 K), the measured leak level is < 10-9 mbar · l/s. This flange assembly simplifies the design, reduces the assembly time by an order of magnitude, and is expected to decrease the accelerator vacuum chamber length.

E13-2010-93 (464.058)
Budagov J. et al.
FEM Analysis of Ultra-Flex Gasket for ILC Cavity Flanges

Numerical simulation of a new kind of metallic gasket by Garlock company, the Ultra-Flex, has been carried out using the ANSYS code for finite element analysis. The main purpose was to determine the optimal geometrical parameters of the seal for our application in ILC cavity flanges. The FEA model shows that if the gasket tore diameter is increased from 4.65 to 8 mm and its thickness is increased from 0.5 to 0.65 mm, the useful elastic recovery (spring-back) of the gasket will drastically increase, from 0.05 to 0.2 mm.

P11-2010-95 (195.710)
Puzynin I.V., Puzynina T.P., Thach V.T.
SLIPM - a MAPLE Package for Numerical Solution of Sturm-Liouville Partial Problems Based on a Continuous Analog of Newton's Method: II. Program Realization

SLIPM (Sturm-LIouville Problem in MAPLE) is a program complex written in the language of the computer algebras system MAPLE. It consists of the main program SLIPM.mw and of some procedures. It is intended for a numerical solution with the help of the continuous analog of Newton's method (CANM) of Sturm-Liouville partial problems, i.e., for calculating some eigenvalue of linear second-order differential operator and a corresponding eigenfunction satisfying homogeneous boundary conditions of the general type. SLIPM is the development of the program complexes SLIP1 and SLIPH4 written in the Fortran language. It is added by two new ways of calculating the initial value of iterative parameter 0, by a procedure for calculating a higher precision solution (eigenvalue and corresponding eigenfunction) with the help of Richardson's extrapolation method, by graphical visualization procedures of intermediate and final results of the iterative process and by saving of the results on a disk file. The descriptions of the procedures purposes and their parameters are given.

P11-2010-96 (366.520)
Amirkhanov I.V. et al.
Investigation of Solutions of Boundary Problems for the Quasipotential Equation Using the Shift Operator

The quasipotential equations are widely applied to the relativistic description of a system of two particles, for example, a quark and an antiquark. In the work, using the shift operator , the solutions of boundary problems for the quasipotential equation with the Coulomb potential, containing the functional , at various values of parameter are investigated. It is established that, at 0 there is a solution which aspires to the Schrdinger equation solution. Besides, the so-called frontier layer solutions and transition of one type of the solution into another are found out. Investigations are carried out using the system of symbolical evaluations MAPLE.

E11-2010-101 (188.535)
Sitnik I.M.
Modification of the FUMILI Minimization Package-2

FUMILI renovation-2 (FUMILIM) is suggested which has the following advantages: a more convenient and friendly user interface; no restriction to the number of parameters and experimental points; speed advantage when the number of parameters is high enough; a possibility to define analytically an arbitrary number of parameter derivatives. An additional package of the track reconstruction in straw chambers is suggested. The solution speed for the specific tasks was increased many times in comparison with the previous version of FUMILIM. All programs are written using FORTRAN-77.

P1-2010-102 (1.017.525)
Adam J. et al.
Lead-Graphite Setup "Gamma-3" for the Study of Transmutation of Long-Lived Radionuclides at JINR LHEP Nuclotron Particle Beams. P.1. Design. Determination of the Neutron Flux per One 2.33 GeV Deuteron

Description of "Gamma-3" setup designed for the study of transmutation of long-lived radionuclides is presented. The setup is represented by a lead neutron-generating target with the dimensions 8 60 cm, surrounded with graphite and irradiated by 2.33 GeV deuteron beam. The dimensions of the graphite assembly are 110 110 60 cm. Within the extent of the graphite assembly channels for the placement of activation detectors and radionuclide samples are made. Experimental results on the determination of the neutron flux per one accelerated deuteron are given. Numerical calculations of neutron spectra and fluxes in the channels of the setup are performed and a comparison with the obtained experimental data is carried out.

P2-2010-104 (299.871)
Kuraev E.A.
Some Problems of Mathematical Physics

Several problems arising in investigation of mechanical systems, electromagnetic fields, electric chains, electron radiation are collected. A set of useful definite integrals, in addition to the known textbooks, is presented as well. Most of the considered items can be subject to further investigation by students. The reader is supposed to be acquainted with the university course of mathematics and physics.

P13-2010-105 (182.993)
Davkov K.I., Myalkovskiy V.V., Peshekhonov V.D., Savenkov A.A.
Development of the Reading Cable with Small Quantity of Substance for Segment Drift Tubes

Manufacturing techniques and key parameters of the developed samples of a flat cable are discussed for segment detectors based on thin-film drift tubes. Multiwire cables possess a small quantity of their own substance simultaneously providing transmission of high voltage and reading the signals from the anode segment on one common trunk. Dark currents of the outflow do not exceed 1 nA and the cross-current value between the trunks of the multiwire cable is less than 1%.

P18-2010-107 (330.727)
Barashkova I.I., Bunyatova E.I., Kravets L.I.
Polypropylene Track Membranes - a Promising Material for Thin Targets with Polarized Protons

With the purpose of creating a new working substance of a polarized target it has been suggested to use polypropylene track membranes produced by irradiation of polypropylene films by a high-energy heavy ion beam and a subsequent chemical etching of the latent tracks of these particles. In order to provide the membranes with paramagnetic properties required for realization of the process of dynamic polarization of nuclei, a nitroxyl radical 2,2,6,6-tetramethyl-piperidine-1-oxyl was introduced into the sample by the method of thermal diffusion. By the electronic paramagnetic resonance method information was received about paramagnetic centers in the polymeric matrix of the membranes, a concentration of the nitroxyl radical and a rotary mobility of the spin probe in them were determined.

E14-2010-108 (796.420)
Smirnov L.S. et al.
Study of Ammonium Molecular Ion Impurity Modes in Rb1-x(NH4)xI Mixed Crystals by Inelastic Incoherent Neutron Scattering

The study of ammonium dynamics in Rb1-x(NH4)xI mixed crystals was carried out by inelastic incoherent neutron scattering in the concentration region of orientationally disordered -phase, 0.0 < x < 0.40, at temperature range from 2 to 150 K. The observed resonance modes correspond to three energy regions: 0.19-0.481 (I), 0.56-3.0 (II) and 4.0- 10.0 (III) meV. The modes of region I could be described by rotational tunneling energies of the multipole moments of ammonium ions. The modes within energy region II correspond to the calculated rotational tunneling energies between splitted levels of the ground librational level of ammonium ion. The modes of region III can be described as local gap modes of ammonium ion because they are located between acoustic and optic branches of RbI phonon density of states.

P7-2010-110 (221.912)
Nasirov A.K., Tashkhodjaev R.B., Abdurazakov O.O.
True Ternary Fission of 236U: Sequential Mechanism?

The mechanism is offered and calculations were performed to explain the true ternary fission of 236U which was revealed experimentally by the "missed mass" method. The calculated yield of the primary excited nucleus 72Ni after emission of neutrons corresponds to the observed most probable yield 68Ni. The good agreement of theoretical results with experimental data means that the assumption about the sequential mechanism of the true ternary fission is reasonable and including the shell effects in a theoretical model is important

P6-2010-111 (387.555)
Aksenov N.V. et al.
Coprecipitation of Ti, Zr and Hf as Homologues of Rf with Lanthanum Fluoride from Hydrofluoric Acid Solutions

The longer half-lives of radionuclides of transactinides 104267Rf and 105268Db discovered in the An + 48Ca reactions expand the application of radiochemical techniques for their chemical characterization and to elucidate the influence of relativistic effects on the chemical properties within a group in the periodic table. Here we report the coprecipitation behavior of Ti, Zr and Hf as lighter homologues of Rf with lanthanum fluoride. The kinetics of coprecipitation and distribution of group 4 elements between the liquid and solid phase, both preformed and formed during the distribution process, was studied as a function of concentration of the micro- and macrocomponent, foreign multivalent ions, HF, pH in solution. The solid phase of prepared samples was characterized by electron microscopy (SEM and TEM). The results show that the coprecipitation mechanism of Zr and Hf with LaF3 is different from Ti and Th and can be assigned to heterovalent isomorphism. A possibility of using coprecipitation with lanthanum fluoride for investigation of the behavior of Rf in HF solutions was demonstrated.

P1-2010-113 (994.069)
Azhgirey L.S. et al.
Study of Short-Range Deuteron Spin Structure at the Fragmentation of Polarized Deuterons into the Cumulative Pions

Data are presented of the vector Ay and tensor Ayy analyzing powers at fragmentation of the polarized 5 and 9 GeV/c deuterons into the high-momentum pions in the kinematic region corresponding to the pion production on the strong correlated nucleon pair (cumulative regime). Observed momentum and angular dependence of pion yields The momentum and angular behaviours of Ayy are not described by the impulse approximation calculations with the standard deuteron wave functions. It seems, to explain the data one needs to construct models, which consider the deuteron core as some multi-quark configuration, 6q cluster, the large orbital momentum of which at D-wave state of the deuteron can be a reason of the strong tensor analyzing power dependence on the pion transverse momentum as it is observed in the A(, )X reaction.

E5-2010-115 (178.626)
Shlyk V.A.
Polyhedral Approach to Integer Partitions

This paper develops the polyhedral approach to integer partitions. We consider the set of partitions of an integer n as a polytope . Vertices of Pn form the class of partitions that provide the first basis for the whole set of partitions of n. Moreover, we show that there exists a subclass of vertices, from which all others can be generated with the use of two combinatorial operations. Numerical experiments demonstrate considerable decrease in the cardinality of these classes of basic partitions. We focus on the vertex enumeration problem for Pn. We prove that vertices of all partition polytopes form a partition ideal of Andrews' partition lattice. This allows us to construct vertices of Pn by a lifting method, which requires examining only certain partitions of n. A criterion of whether a given partition is a convex combination of two others connects vertices with knapsack partitions, sum-free sets, Sidon sets, and Sidon multisets introduced in the paper. Albeit verifying the criterion condition was proved to be an NP-hard problem, it recognizes almost all nonvertices for small n's. We also prove several easy-to-check necessary conditions for a partition to be a vertex.

P13-2010-116 (2.294.100)
Balagurov A.M. et al.
A New Diffractometer at the IBR-2M Reactor for Real-Time Studies of Irreversible Processes

At the FLNP at the IBR-2 pulsed reactor, diffraction and small-angle neutron scattering are used to study irreversible processes in condensed matter in situ in real time. Often only this mode with a continuous recording of experimental information allows obtaining the necessary data for the interpretation of an irreversible process. One of the crucial parameters of such experiments is the minimum time interval over which the necessary statistics can be collected. The minute and sometimes second range of collecting diffraction and SANS patterns have already been realized at the IBR-2. Estimations show that at the upgraded IBR-2M reactor the conditions exist for a significant improvement in time resolution while reducing the mass of the sample. In this report the construction of the specialized spectrometer at the IBR-2M is proposed, which offers a substantially new possibility for real-time experiments. Thus, in favorable cases, the time resolution of the spectrometer will be fractions of milliseconds, which is currently possible only at high-brightness synchrotron radiation sources.

P18-2010-117 (791.044)
Kravets L.I. et al.
Structure and Electrochemical Properties of the Track Membranes Modified by Tetrafluoroethane Plasma

A structure and charge transport properties of the poly(ethylene terephthalate) track membrane modified by the 1,1,1,2-tetrafluoroethane plasma have been studied. It has been found that the polymer deposition on the surface of a track membrane via the plasma polymerization of 1,1,1,2-tetrafluoroethane results in the creation of bilayered composite membranes that possess a conductivity asymmetry in electrolyte solutions - a rectification effect similar to that of a p-n junction in semiconductors. This effect is caused by an important reduction of the pore diameter in the polymer layer that leads to changing the pore geometry as well as by existence of an interface between two layers with different concentrations of carboxyl groups. Information about the charge transport in the studied membranes has been obtained by the method of impedance spectroscopy.

P4-2010-119 (276.504)
Ignatovich V.K., Ignatovich F.V.
Optics of Anisotropic Media

Electromagnetic waves in anisotropic media, their reflection and refraction at interfaces are considered. It is shown that only two linearly polarized modes of plain waves can propagate inside anisotropic media. Reflection from interface with isotropic media is accompanied by double ray splitting, and at sufficiently small grazing angles a surface wave is created on the interface.

P13-2010-121 (576.250)
Gurchin Yu.V. et al.
Detection Equipment of the Experiment for dp-Elastic Scattering Study at the Internal Target Station of the Nuclotron

The detection equipment for dp-elastic scattering study at the internal target of the Nuclotron is presented. Results of the scintillation detectors optimization and results of test experiments using deuteron beam are shown.

E1-2010-122 (517.217)
Gurchin Yu.V. et al.
Status of Preparation of dp-Elastic Scattering Study at the Extracted Beam of the Nuclotron

A selection of dp-elastic scattering events at energies of 1.6 and 2.0 GeV by using scintillation counters has been performed. The procedure of the CH2-C subtraction has been established. The dependence of the elastic events yield on the filter thickness has been investigated. This method can be used to develop the efficient high-energy deuteron beam polarimetry.

P13-2010-124 (488.683)
Panteleyev Ts.Ts. et al.
A Neutron Spectrometer on the Basis of a Proton Telescope with Electronic Collimation of Recoil Protons

A gas recoil neutron spectrometer for measuring the energy distribution of fast neutron fluxes was constructed and its characteristics have been studied. It is based on measurement of the kinetic energy of protons elastically scattered at small angles from (n, p) reaction in the hydrogen gas media. The spectrometer is composed of two cylindrical proportional counters with common anode wire in the centre. The counting efficiency for neutrons with kinetic energies in the interval from 150 keV to 14 MeV is expected to be 10-4-10-6. The estimated energy resolution is about 1.5%.

E10-2010-127 (649.409)
Tsyganov Yu.S.
C++ Builder 6.0 CEDV Code for Files Processing

A RAD C++ Borland's Builder 6.0 code CEDV under Windows XP has been designed for visualizing data obtained from heavy-ion-induced complete fusion reactions at the main U-400 cyclotron of FLNR. The main purpose of the code is processing the data from the experiments aimed at studying chemical properties of SHE. Data from the Dubna Gas-Filled Recoil Separator could be processed too. Some subroutines for estimating statistical parameters are also presented; these are based on modified BSC (background signal combination) approaches. Examples of application both for chemistry experiments and the experiments performed at the Dubna Gas-Filled Recoil Separator are presented.

E2-2010-130 (509.149)
Manjavidze J.
On the Connection between Quantum and Classical Descriptions

The review paper presents generalization of d'Alembert's variational principle: the dynamics of quantum system for an external observer is defined by the exact equilibrium of all forces acting in the system, including the random quantum force . Spetial attention is dedicated to the systems with (hidden) symmetries. It is shown how the symmetry reduces the number of quantum degrees of freedom down to the independent ones. The sin-Gordon model is considered as an example of such a field theory with symmetry. It is shown why the particles S-matrix is trivial in that model.

P13-2010-131 (252.299)
Sobolev Yu.G. et al.
Active Collimators in Experiments with Exotic Nuclear Beams

The active collimator method for experiments with exotic nuclear beams at the energies near Coulomb barrier of nuclear reactions is described. The apparatus consists of two blocks of microchannel plates (MCP) and thin strips of metallic foils (Au, Ag, Al), oriented along X and Y axes. MCPs register electron emission during penetration of exotic nuclei through these foils. It gives possibility to obtain information about particle trajectory and time mark of the event. The proposed technique provides the smallest amount of matter on the particle path (< 8.0 1017 cm-2), high efficiency ( ~ 90% for every MCP), good time resolution for additional identification of radioactive nuclei using the time-of-flight method

P13-2010-132 (401.699)
Volkov A.D.
The Use of the МЕТ1003 Seismic Detector in Experimental Equipment

A possibility of using the MET1003 molecular seismic detector in experimental equipment is examined. The detector is characterized by a high sensitivity, which is 5-10 times higher than the sensitivity of piezoelectric sensors and Bruel & Kjaer Vibro transducers. The МЕТ1003 monitor allows detection of the vibration frequency accurate to better than 0.2 Hz and amplitude accurate to better than 0.1 m in the range 1 to 200 Hz. Working temperature range of the detector is -40 +50 oC. Owing to its high sensitivity and small size, the detector has a wide field of application.

P6-2010-133 (281.720)
Karivai A., Zuzaan P., Gustova M.V.
X-Ray Fluorescence Method for Determination of Some REE and Its Correlation with Thorium

This paper presents a simple procedure for simultaneous determination of rare earths and some trace elements in REE ores in Mongolia using energy dispersive X-ray spectrometer and describes correlation of REEs and thorium. Gamma activation, classic chemical methods and X-ray fluorescence analysis results of mineral resources were used for description of correlation.

P1-2010-134 (464.799)
Kladnitskaya E.N. et al.
Dependences of Kinematical Characteristics for Secondary Particles in dC, C and CC Interactions on Event Collision Centrality at Incident Momentum 4.2 GeV/c per Nucleon

We present the centrality dependence of momenta, transverse momenta, rapidities and polar angles distributions for mesons and protons in dC, C and CC interactions at incident momentum 4.2 GeV/c per nucleon. As a measure for collision centrality the number of proton participants in the event has been taken. The mean values of all variables are obtained at different centralities of collisions.

P13-2010-136 (155.898)
Brudanin V.B. et al.
Large-Volume HPGe Detectors for Registration of Rare Events with Low Energy

Techniques of fabrication and main characteristics of large-volume HPGe detectors with capacitance about 0.5 pF are presented. The elaborated methods have allowed making a detector with a mass similar to coaxial HPGe detectors. Its energy resolution and threshold are close to typical parameters of small X-ray HPGe detectors.

2010-141 (387.618)
Краткий обзор важнейших научных результатов Объединенного института ядерных исследований в 2010 году

E15-2010-142 (540.345)
Bystritsky V.M. et al.
Measurement of Astrophysical S-Factors and Electron Screening Potentials for d(d,n)3He Reaction in ZrD2, TiD2, D2O and CD2 Targets in the Ultralow Energy Region Using Plasma Accelerators

The present paper is devoted to study of electron screening effect influence on the rate of d(d,n)3He reaction in the ultralow deuteron collision energy range in the deuterated polyethylene (CD2), frozen heavy water (D2O) and deuterated metals (ZrD2 and TiD2). The ZrD2 and TiD2 targets were fabricated via magnetron sputtering of titanium and zirconium in gas (deuterium) environment. The experiments have been carried out using high-current plasma pulsed accelerator with forming of inverse Z-pinch (HCEI, RAS, Russia) and pulsed Hall plasma accelerator (NPI at TPU, Russia). The detection of neutrons with an energy of 2.5 MeV from dd reaction was done with eight plastic scintillation spectrometers. As a result of the experiments, the energy dependences of astrophysical S-factor for the dd reaction in the deuteron collision energy range of 2-7 keV and the values of the electron screening potential Ue of interacting deuterons have been measured for the targets indicated above: Ue(CD2) 40 eV; Ue(D2O) 6 eV; Ue(ZrD2) = (157 43) eV; Ue(TiD2) = (125 34) eV. The value of astrophysical S-factor, corresponding to the deuteron collision energy equal to zero, in the experiments with D2O target is found: Sb(0) = (58.6 3.6) keV b (D2O). The paper compares our results with results of other available published experimental and calculated data.

E2-2010-143 (99.299)
Beshtoev Kh.M.
Distinction between the Model of Vector Dominance and the Model of Oscillations

The distinction between the model of vector dominance and the model of oscillations is considered on the example of transitions. It is shown that transition probabilities in these cases differ by a factor of 2. The physical reason of these transition schemes is also discussed.

E3-2010-144 (266.230)
Bunatian G.G., Nikolenko V.G., Popov A.B.
On the E-Linac-Based Neutron Yield

We treat neutron generating in high atomic number materials due to the photonuclear reactions induced by the bremsstrahlung of an electron beam produced by linear electron accelerator (e-linac). The dependence of neutron yield on the electron energy and the irradiated sample size is considered for various sample materials. The calculations are performed without resort to the so-called «numerical Monte Carlo simulation». The acquired neutron yields are well correlated with the data asserted in investigations performed at a number of the e-linac-driven neutron sources.

P11-2010-145 (604.864)
Dimitrov V.T.
Specification Problems of Business Process Semantics

In this paper genesis of the term «business process» is discussed: from the business to Informatics. Special attention is given to this term in Informatics in the context of current business development and its requirements on the software. Specification and implementation of business processes with Service-Oriented Architecture (SOA) based technologies have specific issues. Business demands are for fastest implementation of business process software, but SOA standards are still not mature. As a result of that, software tools are realized that permit business process with contradictive semantics to be specified and even to generate non-working code. Here, the main notations for business process specification are analyzed: WS-BPMN, WS-BPEL and UML activity diagrams.

E14-2010-148 (220.334)
Balasoiu M. et al.
Structural Investigation of Biogenic Ferrihydrite Nanoparticles Dispersion

Structural properties of biogenic ferrihydrite nanoparticles produced by bacteria Klebsiella oxytocaare investigated. Investigations of morphology and size of particles dispersed in water by means of high-resolution transmission electron microscopy and small angle X-ray scattering measurements were performed. By model calculations followed by fitting procedure the structural parameters of a cylinder of radius R =(4.87 0.02) nm and height L =(2.12 0.04) nm are obtained.

E2-2010-149 (108.214)
Shirokov M.I.
My Papers on Quantum Physics

This is an autobibliographical list of papers on quantum physics supplemented by comments.

P9-2010-150 (204.865)
Dolya S.N.
Linear-Circular Proton Accelerator with Energy 0.8 GeV on the Basis of a Rectangular Cavity with Wave E110

We consider the acceleration of protons in the cavity with parameters: length l = 10 m, width b = 20 m, height a = 1.01 m, located between the two steering (180o) magnets with isochronous magnetic field. The resonator is loaded with rows of plates (tubes) of the drift, it is excited by a wave of type E110 at a frequency of f0 = 148.5 MHz, the excitation power P1 = 5.65 MW. Additionally, the cavity is fed power P2 = 8 MW, which is transmitted into a beam of protons with the parameters: the final energy 0.8 GeV, the pulse beam current I = 10 mA, pulse width 25 s, repetition rate 10 Hz. We discuss the possibility of creating, on the basis of such an accelerator, a pulsed neutron source with intensity In = 3 1014 s-1.

P2-2010-152 (156.355)
Gusev A.A., Kosmachev O.S.
Structural Kinematical Approach in Elementary Particle Physics

Unique approach is proposed for constructing of relativistic lepton wave equations. It is kinematical approach because it is exact results based on few conventional fundamental principles. Arising structural constituents of equations and particles are corollary of discrete symmetries or connected components of Lorentz group. Generality and accuracy of the developed method allow one to put the question of its extension on the hadron sector. The conditions for solving of the named problem are discussed such as unification of the mathematical formalism and some widely used notions.



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