Subject Categories for JINR Publications
2012
P10-2012-1 (2.661.239)
Kulakov I.S. et al.
Perfomance Analysis of a Cellular Automaton Algorithm for the Solution of the Track Reconstruction Problem on a Manycore Server at LIT, JINR

The results of the tests for the tracks reconstruction efficiency, the speed of the algorithm and its scalability with respect to the number of cores of the server with two Intel Xeon E5640 CPUs (in total 8 physical or 16 logical cores) are presented and discussed.

E2-2012-2 (168.559)
Lyuboshitz V.L., Lyuboshitz V.V.
Lepton Mixing under the Lepton-Charge Nonconservation, Neutrino Masses and Oscillations and the Forbidden Decay

The lepton-charge (Le, L, L) nonconserving interaction leads to the mixing of the electron, muon, and tau neutrinos, which manifests itself in spatial oscillations of a neutrino beam, and also to the mixing of the electron, negative muon, and - lepton, which, in particular, may be the cause of the forbidden radiative decay of the negative muon into the electron and quantum. Under the assumption that the nondiagonal elements of the mass matrices for neutrinos and ordinary leptons, connected with the lepton-charge nonconservation, are the same, and by performing joint analysis of the experimental data on neutrino oscillations and experimental restriction for the probability of the decay per unit time, the following estimate for the lower bound of neutrino mass has been obtained: m() > 1.5 eV/c2.

E14-2012-4 (168.013)
Frontasyeva M.V. et al.
Application of Some Microorganisms for Synthesis of Gold and Silver Nanoparticles

In recent years, much attention has been paid to microbial technologies of nanoparticle production. Novel strains of actinomycetes Streptomyces glaucus 71MD, Streptomyces spp. 211A, arthrobacter genera - Arthrobacter globiformis 151B and Arthrobacter oxydans 61B and blue-green microalga Spirulina platensis were used for synthesis of silver and gold nanoparticles. The studies were carried out using scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDAX), transmission electron microscopy (TEM), X-ray diffraction (XRD), atomic absorption spectrometry (AAS), and neutron activation analysis (NAA).

P10-2012-7 (307.777)
Slepov I.P., Ososkov G.A., Rogachevsky O.
Informational Support for Software Development of the MPD Experiment at the NICA Collider

The article presents a web-site which carries information for users and software developers of the MPD experiment at the NICA collider. It describes usage of the content management system Drupal for the site creation and tools useful for the software developers of the experiment.

E2-2012-8 (100.061)
Beshtoev Kh.M.
About Direct CP Violation in the System of K0 mesons

This work is devoted to computation of the parameter of direct CP violation by the weak interactions in the system of K0 mesons at K10-, K20-meson mixings and oscillations via KS-, KL-meson states.

P13-2012-11 (2.971.770)
Kruchonak U. et al.
The Device for Measuring Light Attenuation in the WLS Fibers

The device that allows accurate and fast measurement of optical characteristics (light output and attenuation length) of wavelength shifting (WLS) fibers is described. This device was used for test and selection of fibers for the Target Tracker detector of OPERA experiment. After modification the device was used for the studying and selection of WLS fibers for the electromagnetic calorimeter ECAL0 of the COMPASS detector.

E2-2012-12 (265.731)
Tokarev M.V., Zborovsk
On Self-Similarity of Top Production at Tevatron

Results of analysis of D 1.0 fb1 data on top-quark differential cross section measurements at the Fermilab Tevatron collider at = 1960 GeV in the framework of z-scaling approach are presented. Flavour independence of the scaling function (z) observed in pp and interactions over a wide collision energy range = 19-1960 GeV is verified. This property of (z) was found for different hadrons from meson up to particle. The flavour independence of (z) is used as indication to self-similarity of top-quark production. A tendency to saturation of (z) at low z for top-quark is demonstrated. The momentum fractions x1 of the incoming (anti)protons as a function of the scaled transverse momentum pT/m and masses of heavy mesons are studied. We anticipate that data on low- and high-pT inclusive spectra of top-quark production at Tevatron and LHC energies could be of interest for verification of the self-similarity over a wide range of masses and different flavour content of produced particles.

E1-2012-13 (930.639)
Baatar Ts. et al.
A Possible Study of the Phase Transition in -C Interaction at 40 GeV/c

In this paper we consider the momentum and angular characteristics of protons and - mesons produced in -C interactions at 40 GeV/c as a function of the cumulative number nk (or the four-dimensional momentum transfer t). Analysis carried out in this paper indicates possible appearance of the phase transition of nuclear matter.

P8-2012-14 (2.877.207)
Agapov N.N. et al.
Development and Reconstruction of VBLHEP Cryogenic System for NICA Accelerator Complex (2012-2015)

A new NICA accelerator complex (Nuclotron-based Ion Collider fAcility), presently under construction at JINR, will be, upon its completion in 2016, among the most advanced research instruments of the physics community. The facility is aimed to provide collider experiments with heavy ions up to uranium (gold at the beginning stage) with a centre of mass energy up to 11 GeV/u and an average luminosity up to 1027 cm-2 s-1. The NICA cryogenics will be based on the modernized liquid helium plant that was built in the early 1990s for the superconducting synchrotron known as Nuclotron. The main goals of the modernization are increasing of the total refrigerator capacity from 4000 to 8000 W at 4.5 K, creating a new distribution system of liquid helium, and ensuring the shortest possible cooldown time. These goals will be achieved by the use of an additional 1000 l/h helium liquefier and satellite refrigerators located in close proximity to the accelerator rings. We demonstrate helium flow diagrams with major new components and discuss a system of liquid nitrogen that will be used for shield refrigerating at 77 K and at the first stage of cooling down of three accelerator rings with total length of about 1 km and cold mass of 220 t.

P13-2012-16 (236.117)
Pepelyshev Yu.N. et al.
Experimental Estimations of the Kinetics Parameters of the IBR-2 Reactor by Stochastic Noises

Experimental investigations of stochastic fluctuations of pulse energy of the IBR-2M reactor have been carried out which allowed us to obtain some of the parameters of the reactor kinetics. At different levels of average power a sequence of values of pulse energy was recorded with the calculation of the distribution parameters. An ionization chamber with boron installed near the active zone was used as a neutron detector. The research results allowed us to estimate the average lifetime of prompt neutrons = (6.53 0.2) 10-8 s, absolute power of the reactor and intensity of the source of spontaneous neutrons Ssp (6.72 0.12) 106 s-1. It was shown that the experimental results are close to the calculated ones.

E1-2012-17 (605.859)
Piyadin S.M. et al.
First Extraction of the 3.42A GeV 12C Beam for Studies of Baryonic Matter at the Nuclotron

The results of the first extraction of the 3.42A GeV 12C beam at the Nuclotron and its transportation to the experimental area are presented. It is demonstrated that the beam parameters are sufficient for the first phase of the experiments on the studies of the dense baryonic matter at the Nuclotron.

E2-2012-19 (1.264.336)
Tokarev M.V., Dedovich T.G., Zborovsk I.
Self-Similarity of Jet Production in pp and Collisions at RHIC, Tevatron, and LHC

Self-similarity of jet production in pp and collisions is studied in the framework of z scaling. Inclusive jet transverse momentum distributions measured by the STAR Collaboration at RHIC, the CDF and D Collaborations at Tevatron, and the CMS and ATLAS Collaborations at LHC are analyzed. The experimental spectra are compared with next-to-leading order QCD calculations in pT and z presentations. It is shown that self-similar features of jet cross sections manifested by the z scaling give strong restriction on the scaling function (z) at high z. New results on energy and angular independence and asymptotic behavior of (z) are discussed. The obtained results are considered as confirmation of self-similarity of jet production, fractality of hadron structure, and locality of constituent interactions at small scales.

P17-2012-23 (895.577)
Eremin R.A. et al.
Molecular Dynamics Simulations of Monocarboxylic Acid Solutions in Decalin

Pure decalin solutions are investigated using the molecular dynamics simulation method at different contents of stereoisomers. Limiting solutions of monocarboxylic acids with different length of the hydrocarbon chains are studied. A comparison of the features of the structural organization of decalin stereoisomers in the vicinity of saturated (myristic and stearic) and non-saturated (oleic) acid molecules is carried out. The limiting partial molar volumes of the acids are calculated using radial distribution functions. In contrast to earlier data on benzene, a significant difference in the volumes of stearic and oleic acids is observed and explained by the more complex molecular structure of decalin, which is sensitive to the bending of the non-saturated acid molecule.

P9-2012-24 (2.683.863)
Denisov Yu.N. et al.
Computer Modeling of the Acceleration of Low Charge Krypton Ions in Cyclotron CYTRACK

The basic results of numeric simulations of krypton ion motion with decreased charge in cyclotron CYTRACK are presented. Cyclotron CYTRACK is the first world industrial cyclotron dedicated to produce the track membranes. Computer modeling confirms the possibility of 84Kr+11 ion acceleration in the formed magnetic field with increase of the magnetic field level by 1.6% on the sixth harmonic of the accelerating system. Beam energy will be sufficient for exposure of the film with thickness 10 m.

P9-2012-28 (576.122)
Zhabitsky V.M.
Transient Beam Response in Synchrotrons with a Digital Transverse Feedback System

The transient beam response on an externally applied impulse force in synchrotrons with a digital transverse feedback system is studied. Experimental data from the LHC on damping of coherent transverse oscillations excited by the discrete-time unit impulse are analysed. Good agreement on the measured and theoretically predicted decrements has been obtained. A method of feedback fine tuning, based on measurements of bunch response to harmonic excitation impulse, is discussed.

E14-2012-31 (390.955)
Kalabegishvili T. et al.
Synthesis of Gold Nanoparticles by Blue-Green Algae Spirulina platensis

The synthesis of gold nanoparticles by one of the many popular microorganisms - blue-green algae Spirulina platensis was studied. The complex of optical and analytical methods was applied for investigation of experimental samples after exposure to chloroaurate (HAuCl4) solution at different doses and for different time intervals. To characterize formed gold nanoparticles UV-vis, TEM, SEM, EDAX, and XRD were used. It was shown that after 1.5-2 days of exposure the extracellular formation of nanoparticles of spherical form and the distribution peak within the interval of 20-30 nm took place. To determine gold concentrations in the Spirulina platensis biomass, neutron activation analysis (NAA) and atomic absorption spectrometry (AAS) were applied. The results obtained evidence that the concentration of gold accumulated by Spirulina biomass is rapidly growing in the beginning, followed by some increase for the next few days. The obtained substance of Spirulina biomass with gold nanoparticles may be used for medical, pharmaceutical, and technological purposes.

E10-2012-32 (397.595)
Isupov A.Yu.
New Software of the Control and Data Acquisition System for the Nuclotron Internal Target Station

The control and data acquisition system for the Internal Target Station (ITS) of the Nuclotron (LHEP, JINR) is implemented. The new software is based on the ngdp framework under the Unix-like operating system FreeBSD to allow easy network distribution of the on-line data collected from ITS, as well as the internal target remote control.

E15-2012-33 (323.495)
Bogdanova L.N. et al.
Experimental Study of Nuclear Fusion Reactions in a pt System

By means of muon catalysis we study the phenomena in a pt fusion, which have been previously investigated in the only experiment and now are at the frontier of nuclear few-body physics. The experiment is aimed at measuring the yields of the reaction products: quanta, conversion muons and e+e- pairs. As a result we plan to measure the pt-fusion partial product yields (first time for e+e- pairs) with accuracy not worse than 10%, and this will enable us to obtain the nuclear reaction rates in M1 and E0 transitions in A = 4 system.

E15-2012-34 (1.232.243)
Didyk A.Yu., Wisniewski R.
Chemical Composition and Structural Phase Changes of Novel Synthesized Structure and of Pd Sample under -Quanta Irradiation in Dense Deuterium Gas

Studies have been carried out into the element composition of Pd and brass with associated materials and of synthesized novel structure (ANNAWIT), placed in dense deuterium gas in a special high-pressure chamber (HPC) under the pressure of 3 kbar and irradiated with -quanta of energy up to 8.8 MeV. Using the methods of scanning electron microscopy, microelement chemical analysis and X-ray diffraction, it was determined that in the absence of all HPC-forming materials in the chamber volume and walls, the synthesized structure is largely composed of alumosilicates and Al and Si oxides with high content of Ti compounds as rutile TiO2, Pd1.5D2. Considerable anomalies in the chemical composition were found both on the surface and at large depth in a Pd specimen. The entire Pd surface turned into a structure comprised of Pd clusters, Cu and Zn compounds, with a notable content of Mg, Al, S, Si, K, Ca, Ti, and Fe compounds. Results of evaluative calculations, including computation of the Q-value, are presented for nuclear reactions produced in a saturated with deuterium Pd specimen and dense deuterium gas under the action of -quanta, neutrons and protons of energies up to En + Ep E - W MeV generated by deuteron fission. The obtained results can be explained by collective effects as chain reactions caused by deuteron fission induced by protons (Ep > 3.39 MeV) and neutrons (En > 2.25 MeV), as well as by thermonuclear synthesis of deuterium atoms elastically scattered by protons of energies up to EP < W MeV.

E15-2012-35 (1.356.196)
Didyk A.Yu., Wisniewski R.
Phenomenological Nuclear Reaction Description in Deuterium-Saturated Palladium and Synthesized Structure in Dense Deuterium Gas under -Quanta Irradiation

The observed phenomena on changes of chemical compositions in previous reports [1,2] allowed us to develop a phenomenological nuclear fusion-fission model with taking into consideration the elastic and inelastic scattering of photoprotons and photoneutrons, heating of surrounding deuterium nuclei, following D-D fusion reactions and fission of middle-mass nuclei by hot protons, deuterons and various-energy neutrons. Such chain processes could produce the necessary number of neutrons, hot deuterons for explanation of observed experimental results [1,2]. The developed approach can be a basis for creation of deuterated nuclear fission reactors (DNFR) with high-density deuterium gas and so-called deuterated metals. Also, the developed approach can be used for the study of nuclear reactions in high-density deuterium or tritium gases and deuterated metals.

E5-2012-38 (214.779)
Zhidkov P.E.
On Weak Solutions of the Initial Value Problem for the Equation utt=a(x, t)uxx + f(t, x, u, ut, ux)

For the equation of the kind indicated in the title, it is assumed roughly speaking that and and that there exist 0 < a1 < a2 and a3 > 0 such that a1 a(x, t) a2 and | a(x, t)| a3 for any . The function f is assumed to be continuously differentiable and satisfying f(t, x, 0, r, s) 0. The initial data are assumed to be in . The existence and uniqueness of a local weak -solution is proved. In addition, in the special case f(t, x, u, ut, ux) = -|uq-1|u, q 1 the existence of a global weak solution is proved.

E1-2012-39 (63.061)
Kukhtin V.V. et al.
New Approaches for Searching for the Dirac Magnetic Monopole

Three new approaches, not applied earlier, are proposed to search for the Dirac monopole - an object whose existence was proposed by P. Dirac more than 80 years ago to explain the electrical charge quantization. The first approach assumes that the monopole must be accelerated by a magnetic field, and such acceleration is constant in the magnetic field which is homogeneous and constant. The conclusion about the object movement nature can be drawn by measuring the time marks for equidistant registering planes. The second approach is supposed to reconstruct the movement trajectory in the homogeneous and permanent electrical field, which is the circle or its part for the magnetic monopole. The third approach is based on the constancy of energy losses by Dirac monopole due to medium ionization in the multilayer passive dielectric tracking detectors placed in the homogeneous and permanent electrical field.

P13-2012-41 (1.216.862)
Ananiev V.D. et al.
Physical Start-up of the IBR-2 Modernized Reactor

Here we present the main results of the investigation of the IBR-2 reactor after the completion of its modernization, which was carried out within the framework of the program of the physical start-up of the reactor in 2010-2011 operated at a low power of up to 30 kW. The IBR-2 reactor was shut down in 2006 since it reached its design service life limits. A considerable part of the reactor main equipment was replaced except for a biological shield, reactivity modulator and technological systems. According to the results of the physical start-up of the modernized IBR-2 reactor the critical loading of the core was 64 fuel assemblies. The remaining uncharged five cells will ensure the reactor service life for no less than 20 years. The efficiency of the control roads of the reactor safety system and the operating speed of the emergency protection system units meet the nuclear safety requirements. The imitation of the accidents connected with the failures of various technological systems that maintain normal functioning of the reactor has demonstrated that in all cases the reactivity insertion rate is less than the acceptable value and the emergency protection system units in any situation will decrease the reactor power to a safe level during the period between pulses. The fast neutron pulse shape is close to Gaussian with a halfwidth at maximum of (220 3) s. Mean square values of the pulse energy fluctuations do not exceed 5%. The technological systems of the reactor during the physical start-up operated trouble free.

P13-2012-42 (294.132)
Ananiev V.D. et al.
First Power of the IBR-2 Modernized Reactor

We present the main results of the investigation of the modernized IBR-2 reactor carried out within the framework of the program of the power start-up of the reactor in 2011 operated at a power of up to rated 2 MW. According to the results of the power start-up the reactor and its technological systems operated without fail. The new safety control system meets all design objectives and makes it possible to decrease the reactor power to a safe level during the period between pulses. All fast feedbacks (power, flow and isothermal effect) are negative at all levels of power and sodium coolant flow rate through the core. Pulse energy fluctuations are small (5.9% mean square) and considerably less than those of IBR-2 before its shutdown for modernization. The full width at half maximum is (200 4) s, which is less than for IBR-2 in 2004 ((245 4) s). The peak pulse power is 1830 MW, background between pulses 8.6% of mean power. The above-mentioned parameters allow the reactor to maintain its safe and efficient operation at a power of 2 MW at a pulse repetition rate of 5 s-1.

E14-2012-44 (236.669)
Mamedov T.N. et al.
Relaxation of the Shallow Acceptor Center in Germanium

Polarized negative muons were used to study relaxation mechanisms of shallow acceptors in germanium. In p-type germanium at low temperatures relaxation of the muon spin was observed, indicating that the muonic atom (gallium-like acceptor center) formed via capture of the negative muon by a host atom is in the paramagnetic state and its magnetic moment is relaxing. The relaxation rate of the muon spin was found to depend on the temperature and on the concentration of gallium impurity. We conclude that to the relaxation of the magnetic moment of the Ga acceptor in Ge there contribute both scattering of phonons and quadrupole interaction between the acceptors. We estimate, for the first time, the hyperfine interaction constant for the gallium acceptor in germanium as 0.11 MHz.

P13-2012-46 (475.174)
Bogdzel A.A. et al.
Experiment Automation System for a Neutron Powder Diffractometer

The study is concerned with the modernization of a detector system and a control system of the neutron powder diffractometer (NPD) on the GEK-5 channel of the VVR-c reactor (Obninsk branch of the Karpov Institute of Physical Chemistry). In the course of the work a PC-connected hardware-software complex providing for data acquisition and accumulation, as well as for experiment control, has been created. The main modules of the automation system of NPD and the software complex Sonix+ developed in FLNP, JINR, are briefly described. As a result of the modernization the luminosity of the diffractometer has increased and the measurement process has become fully automated.

P6-2012-48 (170.040)
Rakhimov A.V. et al.
Purification of Selenium from Thorium, Uranium, Radium, Actinium and Potassium Impurities for the Low Background Measurements

The new generation of rare event searches experiments requires a new level of very high radiopurity. Main impurities come from the natural long-lived radionuclides Th, U, Ra, Ac and K. In the frame of this field purification of Se polluted with those radioimpurities was carried out taking special care of radiopurity of any reagent used. n instrumental neutron activation analysis of bidistillated water, deionized water and nitric acid was performed. These reagents were used during the process of selenium purification from impurities of Th, U, Ra, Ac and K using the reverse method. Distribution coefficients of 234Th, 230U, 223Ra, 225Ac on the cation-exchange resin DOWEX 50W-X8 in different concentrations of selenium and nitric acid were experimentally measured. The technique of selenium purification from Th, U, Ra, Ac and K was developed. The developed technique of selenium purification has a simple technology of execution and minimal number of reagents (water, nitric acid) which possess a high degree of cleanliness. Operations applied during purification (elution, evaporation) practically exclude losses of a target product (chemical yields of Se > 99 %). Based on this technique test purification of 100 g selenium was carried out. The efficiency of this technique was confirmed by low background spectrometry of purified selenium sample.

E17-2012-49 (1.075.823)
Tropin T.V. et al.
Kinetics of Cluster Growth in Polar Solutions of Fullerene: Experimental and Theoretical Study of C60/NMP Solution

Theoretical models for describing the kinetics of fullerene cluster growth in C60 solutions in N-methyl-2-pyrrolidone (NMP) are presented. First, a detailed review of current state of experimental investigation of C60/NMP is given. The relation between C60-NMP complex formation, cluster growth and their impact on solvatochromism is discussed. Next, we propose a theoretical approach for description of cluster growth based on kinetic equations of segregation. Two modifications of basic approach are given. First one treats cluster growth in a supersaturated solution of C60, where new complex formation eventually limits growth of aggregates. In the second model a two-step process of cluster growth is considered: complex formation and cluster growth. The solution of C60-NMP complexes is supersaturated, while initial, free C60 does not aggregate. For each model a procedure for obtaining parameters is proposed and the parameters values are obtained.

P15-2012-50 (3.348.567)
Didyk A.Yu., Wisniewski R.
Synthesis of Novel Structures in Dense Deuterium and Deuterium Saturated Palladium at Nuclear Reactions Induced by -Quanta

Elemental composition studies of Pd sample irradiated by -quanta in dense deuterium gas of continuous spectrum with the boundary 8.8 MeV energy were carried out. Significant anomalies in the structure and chemical composition are obtained. Considerable changes are observed at both ends of the Pd rod as blowouts of molten metal with complex element composition. A short description of the phenomenological model of nuclear reactions leading to the observed anomalies is presented.

P2-2012-52 (571.731)
Konopleva N.P.
A.Z.Petrov and His Times: My Reminiscences

The situation in geometry, relativity theory and theoretical physics, which was in the 60s-70s of the 20th century in the USSR, is under discussion. The author tells us about Petrov's works on General Relativity, and his contribution to scientific research organization in the above-mentioned fields.

P16-2012-53 (281.000)
Ambrozova I. et al.
LET Spectrometry of the Clinical 12C Ion Beams

The sets of track etched detectors for the linear energy transfer (LET) spectrometry were exposed in 12C 135, 290 and 400 MeV/amu ion beams at the HIMAC installation at NIRS (Chiba, Japan). LET spectra were measured at various depths in 12C ion beams through the Bragg peak area up to the region of fragmentation behind the Bragg peak. In the paper LET spectra measured with track etched detectors TD-1, at the beams axis along 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.

E14-2012-54 (2.410.156)
Iacobescu G.E., Balasoiu M., Bica I.
Investigation of Magnetorheological Elastomer Surface Properties by Atomic Force Microscopy

Magnetorheological elastomers consist of a natural or synthetic rubber matrix interspersed with micron-sized ferromagnetic particles. The magnetoelastic properties of such a composite are not merely a sum of elasticity of the polymer and stiffness and magnetic properties of the filler, but also the result of a complex synergy of several effects, relevant at different length scales and detectable by different techniques. In the present work we investigate the microstructures, the surface magnetic properties and the elastic properties of new isotropic and anisotropic magnetorheological elastomer prepared using silicone rubber and soft magnetic carbonyl iron microspheres. The measurements were performed by atomic force microscopy in the following modes: standard imaging - non-contact atomic force microscopy, magnetic force microscopy and nanoindentation. A comparative study for the samples with different particle concentrations and strength of magnetic field applied during the polymerization process is developed.

E7-2012-58 (178.277)
Oganessian Yu. Ts. et al.
New Insights into the 243Am + 48Ca Reaction Products Previously Observed in the Experiments on Elements 113, 115, and 117. II

We continued experiments on measuring excitation functions of the reaction 243Am + 48Ca and investigation of radioactive properties of isotopes of element 115 that were started in 2010-2011, now at two projectile energies of 241 and 254 MeV. At the lowest energy of 48Ca, we registered seven decay chains of 288115 and three decay chains of the 2n-evaporation product, 298115, which was also observed previously in the reaction 249Bk + 48Ca as the daughter nucleus of the decay of 293117. At the beam energy of 254 MeV one decay chain of 287115 was detected. Altogether thirty-one decay chains originating from 288115 were established as the product of the 3n-evaporation channel by measuring the excitation function at five excitation energies of the compound nucleus 291115. The decay properties of all the newly observed nuclei 287115, 288115 and their descendant nuclides are in full agreement with those we measured in 2003. The -particle energies and decay times of the isotopes 289115, 285113, and 281Rg produced in cross reactions with the two target nuclei 243Am and 249Bk agree well to provide cross bombardment evidence for the discovery of the new elements 113, 115, and 117.

P18-2012-59 (1.248.081)
Kravets L.I. et al.
Research on the Surface and Electrochemical Properties of Polypropylene Track Membrane Modified by Non-Polymerizing Gas Plasma

Surface and electrochemical properties of polypropylene track membrane treated by plasma of nitrogen, air as well as oxygen have been investigated. The influence of the plasma-forming gas composition on the morphology of its surface is studied. It has been found that the micro-relief of the surface of the membranes formed during the gas-discharge etching changes. The effect of the non-polymerizing gas plasma, besides causing oxidation of the membrane surface layer, leads to formation of oxygen-containing functional, basically carbonyl and carboxyl, groups. It is shown that increase in the roughness of the membrane surface and its hydrophilization cause improvement of wettability. In addition, the presence of polar groups in the surface layer of the membranes causes change of their hydrodynamic and electrochemical properties - the water permeability and electric conductivity of the modified membranes raise.

P1-2012-60 (436.363)
Merts S.P., Razin S.V., Rogachevsky O.V.
Accumulation of Spatial Charge in the Time-Projection Chamber of the Multipurpose Detector

The article presents results of numerical simulation of spatial positive charge accumulation in the TPC of Multipurpose Detector at NICA, JINR. Based on the spatial distribution of the charges problem of calculating the electrostatic potential of field created by these charges is solved. The radial, angular and axial distortions of electrons movement from the point of ionization to readout planes are calculated.

E15-2012-61 (943.624)
Sabirov B. et al.
Nuclear Processes Induced by Muon Decay at the K-Orbit of Muonic Atom

Results are presented of an experimental study of processes taking place in the case of muons stopping in nuclei. The aim of the experiment consists in investigating the possibility of a nucleus being excited when a muon on the K-orbit decays. The uniqueness of this process is that the nucleus, happening to be in the electromagnetic field of the muon occupying the lowest atomic orbit of angular momentum , is jolted, when the muon decay occurs, and it mainly undergoes monopole excitation. The experiment aimed at searching for nuclear excitation related to a bound muon is based on the registration of coincidences between electrons from decays and quanta from nuclear transitions. An experimental installation MEGA has been created, that involves a set of scintillation counters for identifying muons stopping in the target enriched with powder-like samarium dioxide Sm2O3, a Ge(Li) detector with a sensitive volume ~ 50 cm3 and a Cherenkov counter made of TF-1 lead glass. The experiment was carried out with the muon beam in the low-background hall of the Phasotron of the JINR Laboratory of Nuclear Problems. The total number of muons that stopped in the target permitted to determine the upper limit for E0 excitation in the 152Sm nucleus to be w(E0) < 1.5 10-3, which is inferior to the level of the theoretical estimate ( 3 10-4). The isomeric shift of the 121.78 keV level in the nucleus has been measured in the presence of a muon on the K-orbit of a muonic atom: Eis = 820 40 eV. The search for monopole excitation of a nucleus related to the decay of a bound muon is to be continued with the use of improved equipment and muon beams of higher intensity.

E6-2012-62 (169.713)
Izosimov I.N. et al.
Chemiluminescence Initiated by Laser-Induced Excitation of Lanthanide and Actinide Ions in Aqueous Solutions

Data on luminol chemiluminescence in solutions containing Sm(III), U(IV), and Pu(IV) are presented. Chemiluminescence was induced by multiquantum excitation of lanthanide and actinide ions in the range of 4f- and 5f-electron transitions by the schemes: two steps - one color and two steps - two colors with the use of dye lasers. We observed chemiluminescence of chemiluminogen (luminol) caused by multiquantum excitation of lanthanides and actinides in aqueous solutions by laser radiation. A multistep scheme of chemiluminescence excitation makes this procedure not only highly sensitive but also highly selective procedure of detection of substances.

P15-2012-63 (471.161)
Didyk A.Yu., Wisniewski R.
Nuclear Reactions in Palladium Saturated with Deuterium and Rhenium in Dense Deuterium Gas under Irradiation by -Quanta of Continuous Spectrum with Boundary 23 MeV Energy

Elemental composition studies of Pd and Re samples irradiated by -quanta in dense deuterium gas of continuous spectrum with the boundary 23 MeV energy were carried out. Significant anomalies in the structure and chemical composition are obtained. Considerable changes are observed at both ends of the Pd and Re wire as blowouts of molten metal with complex element composition, resembling congealed Solar protuberances. The cracky surfaces of the Pd and Re wires were covered with 1-2 m particles predominantly composed of rhenium oxide RexCy. These particles had been crystallized into small hexagonal crystallites near the cracks in the palladium. The rhenium surface was covered by a thick layer with a large carbon concentration. A short description of the phenomenological model of nuclear reactions leading to the observed anomalies is presented.

E15-2012-65 (341.134)
Karamian S.A.
Threshold and Spin Factors in the Yield of Bremsstrahlung-Induced Reactions

Relative yields of photon-induced reactions are systematized in a function of the threshold parameter for moderately heavy targets at the bremsstrahlung end-point energy lower than 30 MeV. Regular dependence is established for the group of (, n), (, p), and (, d) reactions while the yields of (, ) and (, 2n) reactions deviate from the regularity. Physical conclusions are discussed and possible application of this systematics for data processing is proposed. In particular, the constituent threshold and spin factors in the isomer-to-ground state ratio could be separately isolated. For spin dependence of the yields, a new regularization parameter is introduced and previously hidden peculiarities are concluded.

E13-2012-68 (774.907)
Anfimov N.V. et al.
Shashlyk EM Calorimeter Prototype Read Out by MAPD with Superhigh Pixel Density for COMPASS II

A new-generation high-granularity Shashlyk EM calorimeter read out by micropixel avalanche photodiodes (MAPD) with precision thermostabilization based on the Peltier element was designed, constructed and tested. MAPD-3N with a superhigh pixel density of 1.5 104 mm-2 and an area of 3 3 mm manufactured by the Zecotek Company were used in the photodetector unit.

E13-2012-69 (261.651)
Gapienko V.A. et al.
Test of Strip Readout MRPC Equipped with Amplifier Discriminator Based on the NINO Chip

The use of wide strips instead of pads as readout electrodes in a multigap resistive plate chamber (MRPC) helps to reduce essentially a number of FEE channels. However, a strip being a transmission line, requires correct matching with an end terminator that leads to a certain problem in applying already existing FEE in which the time-width correction method is realized to read pads. Here we describe our attempts to use two different amplifier discriminators based on the NINO chip to read 25 mm wide strips in six- and ten-gap timing MRPCs. Tests have been carried out at the IHEP U-70 PS (Protvino).

E7-2012-73 (343.491)
Fomichev A.S. et al.
Long-Range Plans for Research with Radioactive Ion Beams at JINR

Dubna Radioactive Ion Beams (DRIBs) is a general name for initiative to develop a complex of experimental facilities in the Flerov Laboratory of Nuclear Reactions, which should enable world-class research with Radioactive Ion Beams at JINR (Dubna, Russia). The first stage of this initiative (DRIBs-1) operates successfully. However, to meet the requests of the modern research, a new project DRIBs-3 is now being developed. It is based on the in-flight RIB production technique augmented with an ISOL-type second stage. The new fragment-separator ACCULINNA-2 comprising important part of the prospective facility is now under construction with an expected commissioning date in 2015. The long-range plans for experimental research at DRIBs-3 and the program for further development of this facility are discussed.

P15-2012-75 (744.913)
Didyk A.Yu., Wisniewski R.
Changes Observed in the Surfaces, Bulk Properties and Chemical Composition of Vanadium and Stainless Steel Specimens Irradiated in Dense Gaseous Deuterium by -Quanta of Threshold Energy 23 MeV

Studies have been carried out into the changes of properties and element composition of vanadium (V) and stainless steel (SS) specimens irradiated in gaseous deuterium under the pressure 2 kbar by -quanta of continuous spectrum with the boundary energy 23 MeV. Considerable changes are observed in the surface structure and bulk properties of the irradiated V and SS specimens, as was in the earlier authors studies, and in the element composition. The phenomenological model of nuclear reactions leading to the observed element composition of V and SS is described.

E10-2012-78 (101.733)
Makankin A.M. et al.
A Direct Timing Method for the Two-Dimensional Precision Coordinate Detectors Based on Thin-Walled Drift Tubes

The results of a study of the longitudinal spatial resolution of 2 m long straw tubes by means of the direct timing method (DTM) are presented. The feasibility of achieving a coordinate resolution (r.m.s.) better than 9 mm over full length of the straw is demonstrated. The spatial resolution insignificantly changes when measured by detecting gammas from a 55Fe gamma-ray source or minimum ionizing particles from a 106Ru source. The use of the same type of FEE for data taking both for measuring the drift time of ionization electrons and propagation of a signal along the anode wire allows one to construct a two-dimensional detector for precision coordinate measurements.

P13-2012-82 (916.003)
Morozov V.A., Morozova N.V.
Time Correlation of Noise Pulses in a PMT

Two types of time correlation of noise pulses caused by the PMT photocathode and dynodes are established using the autocorrelation delayed-coincidence time spectrometer. Time distributions of noise pulses in the XP2020, XP2232B, XP1021, FEU-85, FEU-87, FEU-93, and FEU-130 photomultiplier tubes are investigated. An exponential time component of noise pulses with a nanosecond scintillation time is found in some types of PMTs.

P10-2012-83 (137.467)
Zlokazov V.B., Utyonkov V.K.
Optimum Confidence Interval in the Analysis of Exponentially Distributed Rare Events

In the analysis of rare events a typical question is as follows: does an observed event ti belong to distribution function with some known parameter? The answer is provided by a region of the (0, t) axis (a confidence interval), inside which the event ti occurs with an a priori probability P. It is appropriate to construct an optimal confidence interval (OCI) satisfying the following requirements which secure that this interval contains the observed random quantity most probably: 1) the length of such an interval should be minimal; 2) the probability within such an interval should be maximum; 3) the ratio of the probabilities of the null hypothesis and its alternative should be maximum. The OCI does not exist for any arbitrary distribution function. However, one can construct such an OCI for the exponential distribution F(t, T) = 1 - exp(-t/T), where it equals [0.2]. Here is an estimate of T. The exponential distribution function is of fundamental importance in the physics of the radioactive decays. The OCI has advantages over usual confidence intervals, since it provides a smaller sum of the Type I and the Type II errors in testing the hypotheses.

E15-2012-84 (101.124)
Karamian S.A.
Yield of Bremsstrahlung Induced Reactions as a Probe of Nucleon-Nucleon Correlations in Heavy Nuclei

Relative yields of (, ) reactions could serve as a probe to verify the theoretical models which assume total alpha-clustering, or multiquark objects in heavy nuclei. A deficit of data on the (, ) process probability must be covered in relatively simple activation experiments. Five concrete reactions are distinguished providing favorable conditions for detection of the low-probability reaction branch (, ). The following requirements must be satisfied: the target species available in an enriched form, the convenient properties of the product activity, and reasonably soft background restrictions. In the present experiment with bremsstrahlung at Ee = 23 MeV, new results are successfully obtained for (, ) reactions in two cases and upper limits are deduced for three other ones. Much lower probability of (, ) compared to (, p) reactions is proved. Alpha-clustering in heavy nuclei is not supported.

P1-2012-85 (319.359)
Yurevich V.I., Fomenko K.A.
Fission and Fragmentation of 208Pb Nuclei in Collisions with Gold Nuclei at Energy of 158 GeV/nucleon

Fission and fragmentation of ultrarelativistic 208Pb nuclei in collisions with gold nuclei were studied with beam of SPS/CERN at an energy of 158 GeV/nucleon. Detectors of target area of NA45/CERES spectrometer were used in the measurements. The obtained magnitude of the fission cross section is (301 44) mb where approximately 77% of the events are due to electromagnetic interactions of the colliding nuclei and the rest part is the contribution of peripheral nuclear interactions. Spallation of the lead nuclei with production of heavy fragments occurs only in collisions with values of impact parameter b > 10 fm. Total disintegration of the lead nuclei into intermediate mass fragments and light particles is observed in some peripheral collisions.

P11-2012-86 (528.445)
Dikusar N.D.
Piecewise Polynomial Approximation of the Sixth Order with Automatic Knots Detection

Coefficients of a local segment model for piecewise polynomial approximation of the sixth order are evaluated using values of the function and of its first derivative at three knots of the support. Formulae for coefficients of the function expansion in degrees of (x - x0) on a three-point grid are obtained within the framework of the recently proposed basic element method. An algorithm for automatic knot detection is developed. Numerical calculations applying quite complicated tests have shown high efficiency of the model with respect to the calculation stability, accuracy and smoothness of approximation.

P11-2012-87 (108.685)
Melezhik A.V.
Speeding Up Matrix Element Computations by Means of MPI Parallel Programming

The solution of some quantum-mechanical problems asks computing large sets of matrix elements involving non-factorable two-dimensional integrals. In the present paper we discuss effective means, using MPI parallel programming, for speeding up the computation of large sets of such matrix elements. To make sound comparison of the computing times, we have developed the sequential code Potential_PC and the parallel code Potential_MPI, able to solve the problems of interest on a personal computer and on a multi-core cluster, respectively. Investigation of case study problems involving matrix elements of specific operators over oscillatory bases showed a gain of CPU time exceeding two orders of magnitude.

P13-2012-93 (1.545.735)
Davkov K.I. et al.
Straw-Based Coordinate Muon Chambers

The article considers a prototype module with sensitive dimensions of 2 0.5 m based on 2 m long straw tubes which preserves its geometrical dimensions up to the pressure of 4 bar independently of the ambient temperature and humidity. The suggested technique provides a possibility of constructing relatively low-cost planar modules by using straw tubes as long as needed for constructing large area detectors at colliders or other field experiments by assembling them in a common coordinate detector with a user-specified acceptance. The distinguishing feature of a detector is its good radiation hardness, low radiation thickness and a possibility of optimizing the detector operation mode in a large range of gas pressure.

E7-2012-95 (138.715)
Volkov V.V., Cherepanov E.A.
Formation of Nuclear Molecules in Cluster Radioactivity. On Interpretation of the Cluster Radioactivity Mechanism

The basis for cluster radioactivity is the property of nuclei of light isotopes of elements heavier than lead to spontaneously form clusters - nuclei of light elements - from valence nucleons, which gives rise to asymmetric nuclear molecules. The cluster formation proceeds through successive excitation-free transfer of valence nucleons to the particle and to subsequent light nuclei. Nuclear molecule formation is accompanied by a considerable amount of released energy, which allows quantum-mechanical penetration of the cluster through the exit Coulomb barrier.

E19-2012-96 (373.238)
Belov O.V. et al.
The Role of the Bacterial Mismatch Repair System in SOS-Induced Mutagenesis: A Theoretical Background

A theoretical study is performed of the possible role of the methyl-directed mismatch repair system in the ultraviolet-induced mutagenesis of Escherichia coli bacterial cells. For this purpose, a mathematical model of the bacterial mismatch repair system is developed. Within this model, the key pathways of this type of repair are simulated on the basis of modern experimental data related to its mechanisms. Here we have modelled in detail five main pathways of DNA misincorporation removal with different DNA exonucleases. Using our calculations, we have tested the hypothesis that the bacterial mismatch repair system is responsible for the removal of the nucleotides misincorporated by DNA polymerase V (the UmuD'2C complex) during ultraviolet-induced SOS response. For the theoretical analysis of the mutation frequency, we have combined the proposed mathematical approach with the model of SOS-induced mutagenesis in the E.coli bacterial cell developed earlier. Our calculations support the hypothesis that methyl-directed mismatch repair influences the mutagenic effect of ultraviolet radiation.

P11-2012-99 (135.563)
Amirkhanov I.V. et al.
Analytical and Computational Investigations of Solutions of Scattering Problem for the Quasipotential Equation

Investigation of solutions of a scattering problem is carried out for the quasipotential equation with piecewise-constant potentials at various values of the parameters of the problem. The comparative analysis of the solutions of the quasipotential equation with the solutions of Schrdinger equation is performed.

E3-2012-100 (397.265)
Sukhovoj A.M. et al.
General Trend and Local Variations of Neutron Resonance Cascade Gamma-Decay Radiative Strength Functions

A new hypothesis on dependence of the form of the radiative strength functions of electric and magnetic dipole gamma transitions in heated nucleus on the excited level density was suggested and tested experimentally. For this purpose, the region of possible values of random values of the level density and radiative strength functions which precisely reproduced experimental intensity of two-step cascades for 41 nuclei from 40K to 200Hg was determined. It was obtained that the suggested hypothesis can provide the maximal increase of radiative strength functions values by order of magnitude in comparison with existing notations as a result of collective effects enhancement. This result points to the necessity to take into account this possibility in existing and future models of radiative strength functions.

P4-2012-101 (224.366)
Pupyshev V.V.
Scattering of a Slow Quantum Particle by a Central Short-Range Potential

In the present work the linear version of the variable phase approach to the potential scattering is added by a new asymptotical method. This method is adopted for a quantum mechanical analysis and the construction of explicit low-energy approximations for the partial phase shifts and radial components of the wave function describing the scattering of a quantum particle by a central short-range potential. The construction of these approximations is reduced to the solution of the recurrence chain of energy independent systems, each system contains two linear first order differential equations. A special attention is paid to physical interpretation of all used functions and the optimization of their numerical analysis.

D18-2012-102 (288.926)
Ignatenko O.V. et al.
Changes of Nitrides Characteristics in Li-N System Synthesized at Different Pressures

Lithium nitride samples were obtained in Li-N system at nitrogen pressure 1-10 atm. Energy-dispersive X-ray (EDX) spectrum of Li-N samples subjected to decomposition demonstrates that lithium nitride is converted into carbonate revealing predominant content of carbon and oxygen. When lithium nitride is being synthesized at positive pressure of nitrogen, -modification, which can be achieved at pressure 500 times higher, is formed; this allows one to hypothesize the minimum pressure required to create a high-pressure phase. The increase in carbon content with increasing synthesis pressure of lithium nitride confirms the change in stoichiometry of its structure formed with high nitrogen content.

E14-2012-103 (90.008)
Stan C. et al.
Investigations of a CoFe2O4-Ferrofluid Structure by Means of Magnetic Measurements

Analysis of experimental results of a water based CoFe2O4 ferrofluid sample by means of magnetic measurements in the temperature range from 80 to 350 K is presented. For the experimental magnetization curves, the fitting magnetogranulometric methods based on the Langevin model for a log-normal distribution of the magnetic particle diameters were considered for two temperature values of 80 and 300 K.

P14-2012-104 (113.634)
Didyk A.Yu. et al.
Thermal Processes in Multi-Layered Second Generation HTSC under Swift Heavy Ion Irradiation

On the basis of the thermal spike model, the estimations with regard to ribbons of the second generation Ag/YBaCuO/MgO/Hastelloy HTSC under irradiation by Ar, Kr and Xe ions with an energy of about 1.2 MeV/a.m.u. have been carried out. The obtained results have been compared with available experimental data. In addition, the possibility of processes such as melting, recrystallization, amorphization and other phase transitions in multi-layered structures under ion irradiation has been studied.

P4-2012-105 (195.638)
Lukyanov V.K. et al.
A Modeling of the Pion-Nucleus Microscopic Optical Potential at Energies of (3,3)-Resonance and In-Medium Effect on the Pion-Nucleon Amplitude of Scattering

Analysis is performed of differential cross sections of elastic scattering of pions on different nuclei at energies between 130 and 290 MeV. To this end the pion-nucleus microscopic optical potential (OP) was applied. Such an OP was constructed using the Glauber theory and defined by the target nucleus density distribution of bare nucleons and by the elementary N-amplitude of scattering. The pion-nucleus cross sections are calculated by numerically solving the corresponding relativistic wave equation. The three parameters of the N scattering amplitude, the total cross section, the ratio of real to imaginary part of the forward N-amplitude, and the slope parameter, were fit to the data on the respective pion-nucleus cross sections. Thus, comparing the sets of free parameters to those obtained from pion-nucleus scattering data, the in-medium effect on the N scattering amplitude is discussed.

E15-2012-107 (969.474)
Demin D.L. et al.
Gamma Spectrometer for Studying the MCF Reactions

A gamma spectrometer composed of two identical BGO-based gamma detectors and associated electronics is described. The main characteristics of the spectrometer are its high detection efficiency in the energy range of gamma rays E 30 MeV and low sensitivity to the accidental background. A distinctive feature of the detector is a plastic scintillator, which surrounds BGO crystal and is viewed by the same photomultiplier tube. This provides effective protection of the detector against the charged particle background. The detector design allows for a compact experimental setup with a large solid angle of gamma-ray registration. The simulation of the spectrometer response function %on the basis of a software package has been performed and experimentally verified using GEANT4 program. The spectrometer was used in a search for the rare muon-catalyzed fusion (MCF) reaction dd 4He + + 23,8 and is designed to study the pt 4He + + 19,8

P9-2012-108 (1.773.754)
Averichev A.S. et al.
Results of the 44th and 45th Nuclotron Runs

Total duration of the 44th (November-December 2011) and 45th (February-March 2012) runs was about 2150 h. During about 900 h the beam was used for experiments in the framework of current program of physical investigations and for the machine development. Among more important achievements during the 44th run one can mention the deuteron beam acceleration up to a record energy of 4 GeV/u and realization of the beam slow extraction at this energy. During the 45th run the scheduled program of physical investigations including experiments with the deuteron beam (extracted and at the internal target) of energy up to 4 GeV/u was fully implemented. During the run the beam acceleration and slow extraction at 4.5 GeV/u were realized.
P15-2012-109 (74.621)
Gangrsky Yu.P. et al.
The Fission Fragment Yields at the Photofission of Actinide Nuclei

The fission fragment yields of isotopes 101Mo, 135I, 135mCs were measured at the photofission of actinide nuclei 232Th, 238U, 237Np. These fission fragments have some peculiarities in nuclear structure or in practical using. The measurements were performed on the microtron bremsstrahlung at the Flerov Laboratory of Nuclear Reactions, JINR, at the electron energy 22 MeV. The activation method with an HPGe detector was used in these measurements of the yields.

P18-2012-110 (532.509)
Zorina D.Yu. et al.
Neutron Activation Analysis of Children's Hair from Ongudai District of Altai

In the present study neutron activation analysis was used to determine short-lived isotopes (Na, Mg, Al, S, Cl, K, Ca, V, Mn, Cu and I) in the hair of Altai children from four villages in Ongudai district of the Altai Republic. Data for 54 boys and 132 girls at the age of 7 to 17 were analyzed. Significantly higher content of sodium, aluminum and chlorine was observed in the hair of boys over girls. Concentrations of magnesium and calcium were significantly higher in the hair of girls. Iodine, copper, manganese and sulfur concentrations in the hair of boys and girls are close to each other, the differences between the sexes are not significant. Median concentrations of the studied elements in the hair of boys and girls were, respectively: Na - 75 and 50; Mg - 49 and 62; Al - 21 and 13; S - 41150 and 39850; Cl - 1020 and 390; Ca - 608 and 973; Mn - 1.1 and 0.82; Cu - 9; I - 0.2 g/g. It was shown that the high content of calcium and magnesium is observed in the hair of children living in rural areas with high hardness and salinity of drinking water. Iodine concentrations in the hair of studied cohort of children is low, especially in puberty.

P6-2012-111 (104.472)
Rakhimov A.V. et al.
Determination of Distribution Coefficient of Alkaline Earth Elements and Lanthanides in the Cation Exchange Resin Extractant System

This work is devoted to the experimental determination of distribution coefficients of the alkaline earth elements and lanthanides in the cation exchange resin - extractant systems. In some of them high separation factors (F) for Yb-Lu have been obtained. These results can be used for the group separation of elements in static conditions (adsorption-re-extraction) and for their concentration.

P13-2012-113 (319.574)
Ananiev V.D. et al.
The World's First Pelletized Cold Neutron Moderator

1In July 10, 2012 cold neutrons were generated for the first time with the unique pelletized neutron moderator CM-202 at the IBR-2 reactor. In this moderator, small spherical beads of solid mixture of aromatic hydrocarbons - benzene derivatives - are applied. Aromatic hydrocarbons are known as the most radiation-resistant hydrogeneous substances and have properties to moderate slow neutrons effectively. After the start of routine operation of the new moderator CM-202, the IBR-2 research reactor of the Frank Laboratory of Neutron Physics will take world's leading position among pulsed neutron sources for investigation of matter with neutron scattering methods.

P3-2012-114 (230.423)
Tsulaia M.I.
Neutron Nuclear Precession - Nuclear Pseudo-Magnetism

This paper contains a complete description of the present state of the neutron nuclear precession, also known as nuclear pseudo-magnetism, from the history of its prediction and theoretical description to the present state of this area of neutron physics. We present different approaches for describing this phenomenon and also the existing experimental results. Finally, we describe other physics effects, which need to be observed experimentally in the future.

E13-2012-115 (297.866)
Rhm A. et al.
Magnetic Planar Waveguides as Combined Polarizers and Spin-Flippers for Neutron Microbeams

We propose the waveguides structures which transform an incident unpolarized neutron beam into a polarized microbeam and can also be used as spin-flippers by varying the incidence angle on the structure. We describe optimized structures combining these functions. Such waveguides could be used for the investigation of one-dimensional magnetic structures and implemented on any existing fixed wavelength reflectometer.

P14-2012-116 (179.664)
Kozhevnikov S.V. et al.
The Use of Polarized Neutron Microbeam for the Investigation of a Magnetic Microstructure

The use of a neutron microbeam for the investigation of internal magnetic microstructure is demonstrated experimentally. An object of the investigation is an amorphous magnetic wire of diameter 190 m with axial and circular magnetic domains inside it. As a sonde for high spatial resolution scan, a narrow neutron microbeam of 2.6 m width is used. This microbeam was produced by a tri-layer film (a planar waveguide). The method of investigation is spin precession at transmission of neutron beam through sample.

E14-2012-117 (198.262)
Kozhevnikov S.V. et al.
Experimental Determination of Neutron Channeling Length in a Planar Waveguide

In neutron waveguides the neutron wave is confined inside the guiding layer of the structure and can escape from the layer edge as a microbeam. The channeling within the guiding layer is accompanied by an exponential decay of the neutron wave function density inside the waveguide. Here we report direct determination of the corresponding decay constant, termed neutron channeling length. For this, we measured the microbeam intensity as a function of the length of a neutron absorbing layer of variable length placed onto the surface of a waveguide structure. Such planar neutron waveguides transform a conventional neutron beam into an extremely narrow but slightly divergent microbeam which could be used for the investigation of nanostructures with submicron spatial resolution.

P4-2012-119 (207.143)
Pupyshev V.V.
Scattering of a Slow Quantum Particle by an Axially Symmetrical Short-Range Potential

In the present work, the linear version of the variable phase approach to the potential scattering is added by a new asymptotic method. This method is adopted for a quantum mechanical analysis and the construction of explicit low-energy approximations for the partial phase shifts, amplitudes, cross-sections and radial components of the wave function describing the scattering of a quantum particle by an axially symmetrical short-range potential. The construction of these approximations is reduced to the solution of the recurrence chain of energy independent systems. Each system contains two linear first order differential equations.

E6-2012-121 (100.582)
Izosimov I.N.
Structure of the Isobar Analog States (IAS), Double Isobar-Analog States (DIAS), and Configuration States (CS) in Halo Nuclei

Structure of the excited states and resonances with different isospin quantum numbers in halo-like nuclei is discussed. It is shown that isobar analog, double isobar-analog, and configuration states can simultaneously have nn, np, and pp halo components in their wave functions.

P10-2012-123 (2.845.671)
Kozlov G.E.
Study of Clustering Algorithms for Detectors with the Pad Structure

We discuss clustering methods and their application to processing responses of the detectors with the pad structure that are used in high energy physics experiments. Hierarchical and iterative methods are described. We discuss their advantages, disadvantages and applicability to a particular task. Three parameters, accuracy, efficiency and speed, are used to characterize each method. The Ward and single linkage methods are currently considered to be the most appropriate choice for our problem. A novel clustering algorithm which takes into account the peculiarities of our task was developed. Simulation studies showed that the novel algorithm has the best performance as compared to the standard Ward and single linkage methods.

P14-2012-124 (715.781)
Balagurov A.M. et al.
Structural Phase Transition in CuFe2O4 Spinel

Copper ferrite CuFe2O4 shows structural transition at T 440 with a reduction of symmetry of high-temperature cubic phase (sp. gr. Fd3m) to tetragonal (sp. gr. I41/amd) and with establishment of ferrimagnetic structure. The coexistence of two structural phases of equitable character was observed in a wide temperature range (~ 40 ) in an experiment using a high resolution neutron diffractometer. Investigated composition is a fully inverted spinel in a cubic phase, and the parameter in a tetragonal phase does not exceed several percent (x = 0.06 0.04). At the same time the phase emerging at the cooling has the classical quantity of tetragonal distortion ( 1.06). The character of temperature changes of structural parameters shows that the transition from the cubic phase to tetragonal allows us to conclude that at the heart of it lies Jahn-Teller distortion of (Cu,Fe)O6 octahedrons but not the boundary migration of copper and iron atoms.

P13-2012-125 (321.623)
Morozov V.A., Morozova N.V.
Investigation of Gas Discharge Processes in PMTs by the Autocorrelation Method

The effect of the potential different at the focusing chamber electrodes of the FEU-85, FEU-87, and FEU-93 photomultipliers on the intensity of afterpulses resulting from gas discharge processes is investigated. With appropriately selected potentials, the number of recorded secondary pulses can be decreased. Charge distribution spectra are obtained for this sort of pulses, which gives a qualitative estimate of both the homogeneity of the charge and mass distribution of residual gases and the ion-electron emission coefficients.

P13-2012-126 (330.833)
Morozov V.A., Morozova N.V.
Specific Features of PMT Secondary Pulse Detection

Specific features of pulse detection by the autocorrelation method are considered with application to PMT secondary pulses governed by processes of feedback ion detection or by scintillation time of inorganic scintillators. It is found that when detecting PMT pulses in the current mode, one should take into account not only the instrumental dead time of the discriminator, but also its dynamic dead time.

E5-2012-128 (153.715)
Ayryan E.A., Gevorkyan A.S., Sevastyanov L.A.
On the Reduction of Dimensionality of a General Classical Three-Body Problem

The reduction of dimensionality of the general three-body classical problem is considered in the framework of the ideas of separation of the internal and external motions of the body system. Based on the fact that for a Hamiltonian system there exists equivalence between phase trajectories and geodesic trajectories on the Riemannian manifold (the Lagrangian surface of the body system), the classical three-body problem is formulated in the framework of six ordinary differential equations (ODEs) of the second order on the tangential bundle of the Lagrange manifold t. It is shown that in the case when the total interaction potential of the body system depends on the relative distances between particles, three out of the six geodesic equations describing rotations of the triangle formed by three bodies are solved exactly. Using this fact it was proved that the general three-body problem can be described in the limits of three nonlinear ODEs of canonical kind. It is shown that the reduced problem describes the dynamics of the three-body system on the scattering plane with consideration of the total angular momentum of the rotating body triangle. The equations of geodesic deviations on the manifold 3 (the space of relative distances between particles) are derived in explicit form. A system of algebraic equations for finding homographic solutions of the restricted three-body problem is obtained. The initial and asymptotic conditions for solution of the classical scattering problem are found.

E5-2012-129 (135.923)
Yamaleev R.M.
Solutions of Riccati-Abel Equation in Terms of Characteristics of General Complex Algebra

The Riccati-Abel differential equation defined as an equation between the first order derivative and the cubic polynomial is explored. In the case of constant coefficients this equation is reduced into an algebraic equation. Method of derivation of a summation formula for solutions of Riccati-Abel equation is elaborated. The solutions of the Riccati-Abel equation are expressed in terms of the characteristic functions of general complex algebra of the third order.

P13-2012-131 (1.420.299)
Pepelyshev Yu.N., Rogov A.D., Tsogtsaikhan Ts.
Statistical Analysis for the Pulse Energy Fluctuations of the IBR-2M Reactor

We present main results of the statistical analysis for the pulse energy fluctuations at the full cycle of the IBR-2M reactor. The data on the dynamics of the noise state of the reactor in the cycle are obtained. The frequence ranges, level of the fluctuations and the possible causes of the fluctuations in the noise energy pulses are presented. Asymmetrical distribution of energy pulses and non-linear behavior due to fast power feedback have been observed. It is shown that 4% of the mean square power fluctuations of the full 6% are due to vibrations of blades of the movable reflectors. The low level of pulse energy fluctuations and stability of their spectral components confirm the reliability and reactor safety at the average power 2 MW.

P10-2012-134 (216.841)
Morkovnikov I.A., Ivankov O.I., Kirilov A.S.
The Program for Measurement Registration at the YuMO Instrument

The work is dedicated to the automation of the registration process of measurements performed on the IBR-2 instruments. Stored information is intended for those responsible for the instruments, in order to simplify measurements accounting, provide information search and assist in the preparation of reports. The general approach to the problem is considered, which in the first phase was implemented on YuMO spectrometer using Python, PyQt, MySQL.

E2-2012-135 (141.577)
Kuraev E.A., Voskresenskaya O.O., Tarasov A.V.
Coulomb Correction to the Screening Angle of the Molire Multiple Scattering Theory

Coulomb correction to the screening angular parameter of the Molire multiple scattering theory is found. Numerical calculations are presented in the range of nuclear charge 4 Z 82. Comparison with the Molire result for the screening angle reveals up to 30% deviation from it for sufficiently heavy elements of the target material.

E4-2012-136 (103.878)
Severyukhin A.P., Voronov V.V., Borzov I.N., Nguyen Van Giai
Finite Rank Separable Approximation for Skyrme Interactions: Spin-Isospin Excitations

A finite rank separable approximation for the quasiparticle random phase approximation with the Skyrme interactions is applied for the case of charge-exchange nuclear modes. The coupling between one- and two-phonon terms in the wave functions are taken into account. It has been shown that the approximation reproduces reasonably well the full charge-exchange RPA results for the spin-dipole resonances in 132Sn. As an illustration of the method, the phonon-phonon coupling effect on the -decay half-life of 78Ni is considered.

P10-2012-138 (954.324)
Bednyakov I.V. et al.
Mapping Structures of Proteins and Nucleic Acids

Methods and algorithms for analysis of surfaces of globular and fibrillar proteins, DNA, and RNA have been developed. These methods of constructing cards of fragments of these objects, in the cylindrical projection original developed herein, essentially expand possibilities for studying distribution of charges and a relief of a surface of biological structures. This approach essentially supplements qualitative characteristics of methods of visualization of biopolymer structures.

P10-2012-139 (137.883)
Grokhlina T.I. et al.
Database of Amino Acid-Nucleotide Contacts in the DNA Complexes with Homeodomain Family Proteins

The analysis of amino acid-nucleotide contacts in interfaces of the protein-DNA complexes, intended to find consistencies in the protein-DNA recognition, is a complex problem that requires analysis of the physicochemical characteristics of these contacts, of the positions of the participating amino acids and nucleotides in the chains of the protein and the DNA, respectively, as well as conservatism of these contacts. Thus, those heterogeneous data should be systematized. For this purpose we have developed a database of amino acid-nucleotide contacts ANTPC (Amino acid Nucleotide Type Position Conservation) following the archetypal example of the proteins in the homeodomain family. We show that it can be used for comparison and classification of interfaces of the protein-DNA complexes.

P2-2012-140 (219.666)
Pestov I.B.
Geometric Theory of Fundamental Interactions. Foundations of Unified Physics

We put forward an idea that regularities of unified physics are in a simple relation: everything in the concept of space and the concept of space in everything. With this hypothesis as a ground, a conceptual structure of a unified geometrical theory of fundamental interactions is created and deductive derivation of its main equations is produced. The formulated theory gives solution of the actual problems, provides opportunity to understand the origin and nature of physical fields, local internal symmetry, time, energy, spin, charge, confinement, dark energy and dark matter, thus conforming the existence of new physics in its unity.

P2-2012-141 (234.916)
Pestov I.B.
Geometric Theory of Fundamental Interactions. Gravidynamics

In this report a mathematical formulation of fundamental concepts of unified geometrical theory of fundamental interactions is given. A concept of momentum of the gravitational field is introduced, equations of gravidynamics are derived, expressions for kinetic energy, potential energy and energy flow vector of the gravitational field are found. A most general form of the law of energy conservation is established, from which it follows that the hypothetical dark energy is the energy of the gravitational field. Two exact solutions of the equations of gravidynamics are obtained and their physical interpretation is given.

P2-2012-142 (299.727)
Pestov I.B.
Geometric Theory of Fundamental Interactions. Spinstatics and Spindynamics

The results of the unified geometrical theory of fundamental interactions that correspond to the physics of microworld are presented and organized in the form of two subdivisions: Spinstatics and Spindynamics. It is supposed that regularities of the microworld are in the relation: everything in the concept of spin symmetry and the concept of spin symmetry in everything. It is shown that geometrical and physical nature of the microworld phenomena or spin one is uncovered in the bipolar structure of spin symmetry induced by the gravitational potential. A deductive derivation of equations of Spinstatics and Spindynamics is given. Operators of the electric charge and neutrino charge are introduced, which give opportunity to understand real nature of the neutrino. An explanation of the confinement and quark-lepton symmetry is given. It is established that the number of the quark-lepton generations is equal to four.

P2-2012-143 (187.230)
Pestov I.B.
Geometric Theory of Fundamental Interactions. Generalized Electromagnetic Field

In this report a theory of a generalized electromagnetic field is formulated, which is titled so because the singlet state of this field corresponds to the electromagnetic field. A concept of a ground state of the generalized electromagnetic field is introduced and deductive derivation of equations of this field in both geometrical and dynamical form is given. The general covariant Maxwell equations for the electric and magnetic fields are derived. A physical interpretation of the theory of the generalized electromagnetic field is given.

E19-2012-146 (310.795)
Sivozhelezov V.S. et al.
Electrostatics as a Factor of Biomolecular Recognition in Processes of Transcription and Translation

Electrostatics of DNA, RNA and proteins is mainly determined by the function of these biomolecules in the processes of transcription and translation, in which the genetic information is converted into the amino acid sequence of proteins, and then implemented in the spatial structure and function of these proteins. Herein, we calculated the electrostatic potentials of the promoter regions of DNA, sigma domain of RNA polymerase and transport RNA, and determined the relationship between the calculated potentials and function of biomolecules in transcription and translation. We used distributed computational environment, for which biomolecules are the natural field of application due to their complexity and high homologous diversity.

P1-2012-147 (1.171.954)
Adam I. et al.
The Study of Spatial Distributions of Neutron Capture and Fission Reactions in Massive Uranium Target Irradiated by Deuterons with Energies of 1-8 GeV (Quinta Setup)

This paper presents results of a study of spatial distributions of neutron radiative capture and natU fission in the target assembly Quinta with a mass of 512 kg of natural metallic uranium irradiated by deuteron beams from the accelerator Nuclotron in the energy range from 1 to 8 GeV with the total number of deuterons on the target ~ 1013 at each energy. From these data the total numbers of fission reactions in the entire volume of the uranium target, and the corresponding total numbers of produced 239Pu nuclei were obtained. It was found that the total numbers of fission Nf and numbers NPu of accumulated 239Pu nuclei normalized to one incident deuteron and 1 GeV of its energy remain constant within experimental error in the studied incident energy range. The values Nf do not change from adding a lead blanket to the target assembly Quinta, and the values NPu increase by about 55%. Analysis of the spatial distributions of neutron radiative capture to fission ratios (spectral indices), the accuracy of which is substantially higher than the rest of the studied observables (due to the absence of systematic errors of monitoring of deuteron numbers on the target), indicates softening of the neutron spectrum at offset from the axis to the periphery of the uranium target. The degree of this softening increases when adding a lead blanket to the target assembly.



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