Physics of Particles and Nuclei Letters

Publications in this journal

• Article: Simulation of beam extraction from C235 cyclotron for proton therapy

  G. A. Karamysheva, S. A. Kostromin, N. A. Morozov, E. V. Samsonov, E. M. Syresin, G. D. Shirkov
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  ABSTRACT: The extraction of an accelerated beam from C235 cyclotron (IBA, Belgium) for proton therapy is simulated. The results of optimizing the parameters of the extraction system to increase the beam extraction efficiency are presented. Our theoretical results agree well with the experimental data. A new configuration of electrostatic deflector is proposed based on the numerical results; using this configuration essentially increases the efficiency of the cyclotron extraction system.
  Physics of Particles and Nuclei Letters 05/2012; 7(7):507-510.
• Article: New methods of data analysis for the E391 experiment

  S. Podolsky, A. Kurilin, Yu. Stepanenko
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  ABSTRACT: We propose a new method for γ-direction measurements for the CsI calorimeter of the E391 experiment. This method is based on using the GRRBF neural network. By using this method, the sensitivity of the E391 experiment could be significantly increased. Current results could be applied to other experiments in which the same γ detector is used.
  Physics of Particles and Nuclei Letters 05/2012; 8(5):498-501.
• Article: “Relationship” specification in Z-notation

  V. Dimitrov
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  ABSTRACT: Initially, relational model of data has been specified by E. F. Codd with the naming conventions to the attributes called “relationship”. It is something between relations and tables, i.e., between implementation and user view on data. In this paper, ideas for “relationship” are formally specified in Z-notation. The last one is an ISO standard now. The purpose of this paper is to reinvestigate ideas behind the “relationships” in a more formal way. This approach is useful for further research in extending relation model of data to capture multimedia data and data streams, which are, usually, generated by different kinds of sensors.
  Physics of Particles and Nuclei Letters 05/2012; 8(4):391-394.
• Article: Estimation of electron-cloud effect on NICA collider

  A. V. Philippov, V. A. Monchinsky, A. B. Kuznetsov
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  ABSTRACT: The preliminary results from simulating the formation of electron clouds in the NICA collider using the ECLOUD program package are presented. Requirements for the acceleration chamber of the NICA collider for a gold nuclei beam are discussed.
  Physics of Particles and Nuclei Letters 05/2012; 7(7):483-486.
• Article: A method of grid element cloning

  I. V. Bednyakov, A. G. Dolbilov, Yu. P. Ivanov
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  ABSTRACT: A simple, reliable, and fast method of putting a new computational facilities into operation in a grid environment is described. This method was successfully tested as part of the grid segment at Dzhelepov Laboratory of Nuclear Problems, Joint Institute for Nuclear Research (JINR), for work at the ATLAS collaboration.
  Physics of Particles and Nuclei Letters 05/2012; 7(6):428-431.
• Article: Capabilities of coupling dissimilar computer codes

  V. A. Rezvov, A. N. Artemiev, A. G. Maevskii, N. A. Artemiev, A. A. Demkiv, B. F. Kirillov, A. D. Belyaev
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  ABSTRACT: A method for automatically controlling commercial computer codes is described. The coupling of the automation system of the EXAFS spectrometer controlled by a DOS-operated computer that we developed and the commercial program of a semiconductor-detector control installed on a Windows-operated computer is given as the example. The described complex system is used for the automation of the intermediate processing of amplitude spectra while measuring EXAFS spectra at the Kurchatov Synchrotron Radiation Source.
  Physics of Particles and Nuclei Letters 05/2012; 7(7):522-524.
• Article: Simulating the radiation transformations in rocks-potential media for radioactive waste disposal

  N. I. Bazaleev, B. B. Banduryan, T. I. Ivankina, V. F. Klepikov, V. V. Lytvynenko, Yu. F. Lonin, A. N. Nikitin, A. G. Ponomarev, V. N. Robuk, V. V. Uvarov, V. T. Uvarov
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  ABSTRACT: The impact of high-current pulsed relativistic electron beams on the way craters form in rock samples (granites and labradorite) is studied. The method of thermal-imaging monitoring is tested for quickly estimating the sample surface state and determining the insulating properties of geomaterials. It is shown that such complex experiments are appropriate for investigating rock properties, which are of utmost importance in choosing places for radioactive waste disposal.
  Physics of Particles and Nuclei Letters 05/2012; 6(5):417-423.
• Article: Measurement of quadrupole moments of unstable nuclei during channeling and the possibility of revealing the effect of vector polarization of tensor-polarized beams of nuclei

  A. Ya. Silenko
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  ABSTRACT: General relations are deduced which describe the spin dynamics of beams of nuclei with the initial tensor and vector polarizations upon planar channeling in bent crystals. Our analysis demonstrates the possibility of revealing the effect of vector polarization, as predicted by Baryshevsky and Sokolsky, which occurs upon the planar channeling of a beam of nuclei with initial tensor polarization. The planar channeling of a beam of nuclei with the initial tensor and vector polarizations may be used to determine the quadrupole moments of unstable nuclei with a small lifetime of up to the order of 10−7 s. The quadrupole moments of nuclei with a lifetime on the order of 10−7 s cannot be measured by known techniques, including optical methods.
  Physics of Particles and Nuclei Letters 05/2012; 8(4):368-373.
• Article: New nomographic solutions in the newtonian many-body problem

  E. A. Grebenikov, N. I. Zemtsova
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  ABSTRACT: The problem of the existence of concentric central configurations, geometrically presented by regular n- and 2n-sided polygons nested in one another, is investigated. The necessary and sufficient conditions for the existence of these central configurations are derived using computer algebra.
  Physics of Particles and Nuclei Letters 05/2012; 8(5):428-430.
• Article: Parameter monitoring and control system of Dubna Gas-Filled Recoil Separator

  A. M. Sukhov, A. N. Polyakov, Yu. S. Tsyganov
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  ABSTRACT: A modified integrated parameter-monitoring and control system for experiments on the synthesis of superheavy nuclei at the U-400 cyclotron of the Flerov Laboratory of Nuclear Reactions is considered. Experiments on the irradiation of heavy actinide targets were performed at the Dubna Gas-Filled Recoil Separator (DGFRS) [1]. This system consists of three components, namely, the detection module parameter control subsystem, the beam parameter monitoring subsystem, and the separator technical parameter control subsystem. The system is designed in CAMAC standard, the software is written under Windows XP using RAD Borland C++ Builder 6.0 and Kk009Pci interface (LNR) [2, 3].
  Physics of Particles and Nuclei Letters 05/2012; 7(5):370-377.
• Article: Measurements of the magnetic field map of the analyzing magnet of the Delta-Sigma setup spectrometer

  I. P. Yudin, D. K. Gur’ev, S. A. Dolgii, A. Ya. Kutov, V. M. Lutsenko, A. A. Morozov, G. P. Nikolaevskii, A. A. Nomofilov, N. S. Rossiyskaya, A. Yu. Starikov, L. N. Strunov, V. I. Sharov, R. A. Shindin, S. N. Shkarovskii
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  ABSTRACT: One of the basic tasks of the Delta-Sigma Experiment project is to measure the energy dependences in the GeV region of the neutron beam of spin dependent NN observables A 00kk (np), A 00nn (np), and R dp . These observables are determined by measuring proton yields in the charge-exchange reaction np → pn at an angle of 0° using the magnetic spectrometer of the Delta-Sigma setup. The magnetic field map of the analyzing magnet of the setup spectrometer was measured in order to precisely determine the charge exchange proton momenta. The Delta-Sigma setup is situated in building 205 of the Laboratory of High Energies of the Joint Institute for Nuclear Research. The spectrometer magnet 2-SP-94 in 1V channel has external dimensions of 2.95 × 2.12 × 1.62 m and an aperture (occupied by the beam) of 0.30 × 0.09 m. A three-component Hall probe was used to measure the magnetic field. The volume of measurements was 0.33 × 0.0645 × 1.02 m. In this paper, the measuring equipment, measurement procedure, and results used in processing and analyzing the physical data obtained are described.
  Physics of Particles and Nuclei Letters 05/2012; 6(2):145-150.
• Article: Non-Markovian relaxation of atomic systems and a calculation of the shape of spectral lines

  V. V. Semin, A. V. Gorokhov
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  ABSTRACT: A non-Markovian kinetic equation for a system of two identical interacting two-level atoms has been derived. The solution to this equation has been used for calculating the shape of spectral lines of this system.
  Physics of Particles and Nuclei Letters 04/2012; 8(5):467-469.
• Article: The influence of DNA inhibitor synthesis on the induction and repair of double-strand DNA breaks in human lymphocytes under action of radiation with a different linear energy transfer

  A. V. Boreyko, V. N. Chausov, E. A. Krasavin, I. Ravnachka, S. I. Stukova
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  ABSTRACT: The influence that inhibitors of repair and replicative DNA synthesis, 1-β-D-arabinofuranosyl-cytosine and hydroxyurea, have on the formation and repair kinetics of double-strand breaks (DSBs) in peripheral human blood lymphocytes under the influence of radiation with a different linear energy transfer (LET) (gamma quanta and accelerated heavy ions) is studied. It is demonstrated that lithium and boron ions with LETs of 20 and 40 keV/μm, respectively, possess higher biological effectiveness with respect to the DNA DSB induction criterion. The value of the relative biological effectiveness of accelerated lithium and boron ions is 1.5 ± 0.1 and 1.6 ± 0.1, respectively. It is found that, upon cell irradiation by gamma quanta in the absence of inhibitors, efficient DNA DSB repair is observed during incubation. Under the conditions of cell incubation and in the presence of inhibitors, some growth in the number of DNA DSBs, rather than a reduction, is observed after 5-h incubation. In the case of the action of accelerated boron ions (as well as gamma quanta), under normal conditions, the efficient repair of induced DNA lesions takes place. Unlike the action of gamma quanta, in the case of cell incubation in the presence of radiomodifiers, the number of induced DNA DSBs falls. These results may testify to the fact that the repair of double-strand DNS breaks takes place under the action of ionizing radiation with a different LET on mammalian cells in the presence of DNA synthesis inhibitors Ara-C and HU. It is concluded that, for cells subject to gamma irradiation, no DNA DSB repair is observed due to the large contribution of single-strand incision DNA breaks formed in the postradiation period in the course of excision nucleotide repair.
  Physics of Particles and Nuclei Letters 04/2012; 8(4):399-404.
• Article: Analysis of neutron spectra and fluxes obtained with cold and thermal moderators at IBR-2 reactor: Experimental and computer-modeling studies

  A. I. Kuklin, A. D. Rogov, Yu. E. Gorshkova, P. K. Utrobin, Yu. S. Kovalev, A. V. Rogachev, O. I. Ivankov, S. A. Kutuzov, D. V. Soloviov, V. I. Gordeliy
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  ABSTRACT: The results of experimental and computer-modeling investigations of neutron spectra and fluxes obtained with cold and thermal moderators at the IBR-2 reactor (Joint Institute for Nuclear Research (JINR), Dubna) are presented. These studies are for the YuMO small-angle neutron scattering (SANS) spectrometer (IBR-2 beamline 4). The neutron spectra have been measured for two methane cold moderators for the standard configuration of the SANS instrument. The data from both moderators under different conditions of their operation are compared. The ratio of experimentally determined neutron fluxes of cold and thermal moderators is shown at different wavelengths. Monte Carlo simulations have been carried out to determine the spectra for cold-methane and thermal moderators. The results of calculations of the ratio of neutron fluxes of cold and thermal moderators at different wavelengths are demonstrated. In addition, the absorption of neutrons in the air gaps on the way from the moderator to the investigated sample is presented. SANS with the protein apoferritin was done with both cold methane and a thermal moderator and the data were compared. The prospects for the use of a cold moderator for a SANS spectrometer at IBR-2 are discussed. The advantages of using the YuMO spectrometer with a thermal moderator with respect to the tested cold moderator are shown.
  Physics of Particles and Nuclei Letters 04/2012; 8(2):119-128.
• Article: Separation of differential np → pn charge-exchange cross section into flip and nonflip parts at Tn = 0.5–2.0 GeV

  R. A. Shindin, D. K. Gur’ev, A. A. Morozov, A. A. Nomofilov, L. N. Strunov
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  ABSTRACT: New results of the Delta-Sigma experiment on measuring the R dp ratio made it possible to separate flip and nonflip parts of the differential cross section of the np → pn reaction at zero angle using the Dean formula. Phase-shift-analysis (PSA) solutions for elastic np → np scattering are transformed into a np → pn charge-exchange representation using unitary transformations, which testifies to the good agreement of the theoretical and experimental results.
  Physics of Particles and Nuclei Letters 04/2012; 8(2):90-96.
• Article: Laser confocal microscopy for investigating small structures

  Yu. S. Kovalev, V. A. Skuratov, S. I. Tyutyunnikov, G. Buinarovski
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  ABSTRACT: The applicability of Raman scanning confocal microscopy for investigations in the field of condensed matter physics is demonstrated.
  Physics of Particles and Nuclei Letters 04/2012; 7(5):364-369.
• Article: Modeling ultraviolet-induced SOS response in translesion synthesis-deficient cells of Escherichia Coli bacteria

  O. V. Belov
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  ABSTRACT: A quantitative analysis is performed of SOS response induced by ultraviolet radiation in Escherichia coli bacterial cells with the disordered function of translesion synthesis. The dynamics of the concentration of the basic SOS proteins is estimated for the recA, umuD, and umuC mutants of E. coli. The estimation is based on the model approaches developed earlier.
  Physics of Particles and Nuclei Letters 04/2012; 8(1):61-66.