Preprints and Communications

Here you can find JINR preprints and communications in pdf format starting from 1999.
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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. E2-2011-8 (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-2М 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. Аn 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. 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. 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). 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.

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