Pepan Letters
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Preprints and Communications

Here you can find JINR preprints and communications in pdf format starting from 1999.
File size is given in bytes in round brackets.

Subject Categories for JINR Publications Archive (1999 - 2016)


2017-1 (1.257.218)
Brief Review of Topmost Scientific Results Obtained in 2016 at the Joint Institute for Nuclear Research

E2-2017-2 (182.901)
Tokarev M., Zborovský I.
Top-Quark ρT -Spectra at CMS and Flavor Independence of z-Scaling

We present new results of the analysis of top-quark differential cross sections obtained by the CMS Collaboration in ρρ collisions within the z-scaling approach. The spectra are measured over a wide range of collision energy √s=7, 8, 13 TeV and transverse momentum ρT = 30500 GeV/c of top-quark using leptonic and jet decay modes. Flavor independence of the scaling function ψ(z) is verified in the new kinematic range. The results of analysis of the top-quark spectra obtained at the LHC are compared with similar spectra measured in ρρ collisions at the Tevatron energy √s = 1,96 TeV. A tendency to saturation of ψ(z) for the process at low z and a power-law behavior of ψ(z) at high z is observed. The measurements of high ρT spectra of the top-quark production at the highest LHC energy is of interest for verification of self-similarity of particle production, understanding the flavor origin, and search for new physics symmetries with top-quark probe.

P2-2017-3 (337.191)
Dedovich T. G., Tokarev M. V.
Reconstruction of Fractals in the Presence of Background Events

Analysis of samples containing fractal and background events is performed using the method of systems of equations of P-adic coverages (SePaC) and Box Counting (BC) method. The features of these methods are studied. The procedures to indicate the existence of fractals in the combined sample, reconstruct fractals, estimate a fraction of fractals and estimate background in the extracted sample are suggested. The results of a comparative analysis of combined fractal samples using these methods are presented.

P13-2017-4 (519.460)
Pepelyshev Yu. N., Tsogtsaikhan Ts.
Investigation of the Dynamics of Pulse Energy Noise at the IBR-2M Reactor in the Fuel Burnup

In this paper, we present the results of a study on pulse energy noise dynamics of the IBR-2M in the fuel burnup for a significant period of the reactor operation, starting from the date of its commissioning in 2011 and until the end of 2016. It is shown that the pulse energy noise during operation of the IBR-2M with burnup to about ∼1100 MW·day changes significantly by both the spectral component and the level. The standard deviation of the random power fluctuations did not exceed 5% and was less than allowable. In addition, the low level of low-frequency noise (∼1,6%) indicates the absence of sign of vibrational instability of the reactor and a substantial margin of burnup until instability.

E19-2017-5 (386.497)
Koltovaya N. et al.
Kinetics of Gene and Chromosome Mutations Induced by UV-C in Yeast Saccharomyces cerevisiae

The systematic study of the kinetics of UV-induced gene and structural mutations in eukaryotic cells was carried out on the basis of model yeast S. cerevisiae. A variety of genetic assays (all types of base pair substitutions, frameshifts, forward mutations canl, chromosomal and plasmid rearrangements) in haploid strains were used. Yeast cells were treated by UV-C light of fluence of energy up to 200 J/m2. The kinetics of the induced gene and structural mutations is represented by a linear-quadratic and exponential functions. The slope of curves in log-log plots was not constant, had the value 2-4 and depended on the interval of doses. It was suggested that it is the superposition and dynamics of different pathways form the mutagenic responses of eukaryotic cells to UV-C light that cause the high-order curves.

P19-2017-11 (125.300)
Kiselev Yu.F.
Analytical Model of Active and Passive Transport in Biological Membranes

A formula is obtained for calculating the ion concentration profile in biological membranes. It is assumed that spherical ions move in an aqueous solution under the influence of an electric field and a concentration gradient. The friction force follows the Stokes law. The ions are covered with hydrate shells consisting of a dipole of water molecules which change their effective radius and friction. It is shown that if the friction force at the membrane inlet is stronger than at its outlet, then the ions can move by active transport. Analysis of the hydration allows the development of an analytical model of active and passive ion transport in membranes. The calculations are consistent with the concentration profile of Na+1, K+1 and Cl-1 measured in frog and squid cells.

E3-2017-12 (1.674.130)
Aksenov V. L.
A 15-year Forward Look at Neutron Facilities in JINR

The service life of the IBR-2 reactor, one of the leading pulse neutron sources in the world, is expected to end in 2032. Modern trends in sciences where neutrons are used, possible variants of a concept for a new neutron source and its potential position in the world neutron landscape are discussed. The flagship experiments for a new neutron source in the fields of condensed matter research, fundamental and nuclear physics are proposed.

P9-2017-13 (883.500)
Dolya S. N., Sarkhadov I.
Calculation of High-Current Linear Proton Accelerator with an Energy of 80 MeV

This article considers the possibility of pulsed acceleration in a spiral waveguide of a proton beam with the current Ib = 0,7 A. The accelerator consists of three parts. The energy of the proton injection is 50 keV. In the first part of the accelerator having the length Lacc1 ≈ 1,4 m, the protons are accelerated up to the energy ϵ 1fin = 0,8 MeV. In this section of the accelerator, consumption of high-frequency power is P1 = 0,8 MW. In the second part of the accelerator with the length Lacc2 ≈ 2 m, the protons are accelerated up to the energy ϵ 2fin = 5 MeV. Consumption of high-frequency power in the second part of the accelerator is P2 = 4 MW. The third part of the accelerator consists of 8 sections, each being 7 m long. Radial focusing of the proton beam in this accelerator is carried out with the magnetic field intensity H = 10 , generated by a superconducting solenoid.

P13-2017-16 (431.772)
Agapov A. V., Mitsyn G. V.
Multichannel Magnetic Field Measuring System Using Hall Sensors for Proton Therapy Beamline Elements ControlA 15-year Forward Look at Neutron Facilities in JINR

The article considers the design and construction of a multichannel magnetic field measuring system using Hall sensors elaborated at the Medico-Technical Complex of the DLNP, JINR. The developed system allows monitoring magnetic induction fluctuations of the bending electromagnets of the proton therapy beamline. The thermostatic and power supply modules have been designed to solve the problem of thermal instability of Hall sensors. The set-point temperature of working volume of the Hall sensors is about 40°C with an accuracy of ± 0.05°; and the precision of supply voltage is ± 1 mV. The multichannel magnetic field measuring system is routinely used in the proton therapy treatment sessions implementing the “quality assurance” of treatment.

P1-2017-17 (241.196)
Zinchenko Al. I. et al.
The Solenoid for the SPD Set-Up of the NICA Collider

Requirements were considered and recommendations were formulated for the later technical design of the magnet for the SPD set-up. It has been shown that to get magnetic field homogeneity in the 1% limits for the whole inner solenoid volume, one has to use additional coils which must be placed in the end faces of the solenoid. The superconducting magnet is preferred to the warm version due to the lower weight and occupied volume of the coil, and the absence of the heat evacuation problem also.

P9-2017-18 (1.612.690)
Butenko A. V. et al.
Magnetic Field Errors Tolerance of Nuclotron Booster

Generation of magnetic field in the units of the booster synchrotron for the NICA project is one of the most important conditions for getting the required parameters and qualitative accelerator operation. Research of linear and nonlinear dynamics of the 197Au31+ ion beam in the booster was carried out with the MADX program. Analytical estimation of magnetic field errors tolerance and numerical computation of dynamic aperture of the booster DFO-magnetic lattice is presented. Closed orbit distortion with random errors of magnetic fields and errors in layout of the booster units was evaluated.

E1-2017-20 (187.754)
Glonti L. et al.
Longitudinal Tension and Mechanical Stability of a Pressurized Straw Tube

When developing charged particle detectors based on straw tubes working in vacuum, a special technique is needed for their mechanical properties evaluation. An experimental method of strained pressurized straw tube mechanical properties study is presented. The performed measurement results are in agreement with the approximate calculations taking into account the known uncertainties of the wall material parameters. It is shown that the difference between the tube wall longitudinal tension and the pressure force applied to the tube cross section area defines both the straw tube transverse stability and the lowest value of its oscillation frequency.

P10-2017-21 (333.944)
Derenovskaya . Yu., Ivanov V. V., Ogorodnikova D. S.
J/ψe+e Decays Selection Criteria for Au + Au Collisions at 10A GeV in the CBM Experiment

Currently the CBM experiment is being developed in GSI (Darmstadt, Germany) at the FAIR accelerator complex of an international collaboration with JINR. Measurements of the J/ψe+e decays are the key objectives of the CBM experiment, the registration of such decays is planned to be held in real-time experiment. The current paper presents criteria that provide an effective selection of signal events for Au + Au collisions at 10A GeV. This energy corresponds to the first stage of the CBM experiment.

E9-2017-23 (304.357)
Sabirov B. et al.
Recent Optimized Design of ILC Cryomodule with Explosion Welding Technology

This paper summarizes the test results of modified components for the cryomodule of the International Linear Collider (ILC) obtained by the international collaboration of JINR (Dubna, Russia), INFN (Pisa/Genova, Italy), and PWI (Kiev, Ukraine).Initially, the baseline design for the superconducting RF cavities of the ILC is the TESLA 1.3 GHz cavity design developed at DESY consisting of a 9-cell cavity structure of Nb sheet material and Ti for the surrounding helium vessel and for the biphase He gas return pipe. To make the ILC project even cheaper, it is proposed to replace titanium cryomodule components with stainless steel (SS) ones using a unique method based on explosion welding, opening up the possibility to develop a new-generation of cryomodules for particle accelerators. These cryogenic system components operate at superlow temperatures, as niobium cavities are contained in a stainless steel vessel filled with superfluid liquid helium at 1.8 K. Stepwise upgrading of these components to the latest version of the Nb/Ti/SS transition element has led to an evolutionary improvement of the ILC cryomodule. This new component resolves problems of residual stress, and its peculiar design prevents the possibility of a shift due to the difference in the linear expansion coefficients of the constituent metals. He leak testing found no leaks at the background rate of
≈ 0,4 · 10-10 · cm3 · c1

E1-2017-24 (145.302)
Komarov V. I.
On the Possibility of Revealing the Transition of a Baryon Pair State to a Six-Quark Confinement State

Proton-proton collisions are considered to find favorable conditions for searching for the transition of a baryon pair state to a hexa-quark confinement state
(3q) + (3q) → (6q)cnf. It is admitted that central pp collisions in a definite range of the initial energy can lead to creation of an intermediate compound system where the hexa-quark dibaryon can be formed. Criteria for the selection of central collision events and for manifestation of the quark-structure dibaryon production are proposed.

P1-2017-26 (640.460)
Lenivenko V. V., Palichik V. V.
Reconstruction of Charged Particle Trajectories in Multiwire Proportional Chambers at the BM@N Experiment

The algorithm for track reconstruction in the multiwire proportional chambers (MWPC) of the BM@N experiment is described. Beam tracks before the interaction with the target and trajectories of charged particles after the interaction are reconstructed using Nuclotron experimental data with deuteron and carbon beams colliding with the carbon and copper targets. Trajectories are extrapolated to the interaction point and to the drift chambers. Efficiencies of MWPCs have been obtained. Beam parameters (transverse dimensions, the angular spread) have been measured.
D13-2017-28 (225.935)
Chirikov-Zorin I.
New Method for Determining Avalanche Breakdown Voltage of Silicon Photomultipliers

The avalanche breakdown and Geiger mode of the silicon pn junction is considered. A precise physically motivated method is proposed for determining the avalanche breakdown voltage of silicon photomultipliers (SiPM). The method is based on measuring the dependence of the relative photon detection efficiency (PDErel) on the bias voltage when one type of carriers (electron or hole) is injected into the avalanche multiplication zone of the pn junction. The injection of electrons or holes from the base region of the SiPM semiconductor structure is performed using short-wave or long-wave light. At a low overvoltage (12 V) the detection efficiency is linearly dependent on the bias voltage; therefore, extrapolation to zero PDErel value determines the SiPM avalanche breakdown voltage with an accuracy within a few millivolts.

E6-2017-29 (268.100)
Izosimov I. N. et al.
Fine Structure of Beta-Decay Strength Function and Anisotropy of Isovector Nuclear Density Component Oscillations in Deformed Nuclei

The experimental measurement data on the fine structure of beta-decay strength function Sβ (E) in spherical, transition, and deformed nuclei are analyzed. Modern high-resolution nuclear spectroscopy methods made it possible to identify the splitting of peaks in Sβ (E) for deformed nuclei. By analogy with splitting of the peak of E1 giant dipole resonance (GDR) in deformed nuclei, the peaks in Sβ (E) are split into two components from the axial nuclear deformation. In this report, the fine structure of Sβ (E) is discussed. Splitting of the peaks connected with the oscillations of neutrons against protons (E1 GDR), of proton holes against neutrons (peaks in Sβ (E) of β+/EC decay), and of protons against neutron holes (peaks in Sβ(E) of β decay) is discussed.

P3-2017-32 (218.128)
iselev . . et al.
Analysis of Vesicular Structure of Nanoparticles in the Phospholipid Based Drug Delivery System using SAXS Data

Small-angle X-ray scattering has been used to characterize the Phospholipid Transport Nanosystem (PTNS) at the PTNS concentrations in water of 25%, 31.25%, and 37.5%. The vesicle's average radius, size polydispersity, bilayer thickness, and internal structure were evaluated from the experiment via applications of two models for the photon scattering density distribution. Two independent methods were used for the calculation of the SAXS spectra: the form factor of the heterogeneous spherical shell and the method of separated form factors. Two methods of the spectra calculation and two models for the approximation of the photon scattering length density evaluation provide coincident results, which demonstrate the decrease in the vesicle radius, thickness of the bilayer, and thickness of the hydrocarbon chains region at the increase in the maltose concentration in water.
P1-2017-33 (445.156)
Terekhin A. A. et al.
The Differential Cross Section of Elastic dp-Scattering at 700 MeV/nucleon

The results of the differential cross section elastic dp-scattering measurements at 700 MeV/nucleon, performed at the Internal Target Station at the JINR Nuclotron, are presented. The data were obtained for angular range 70120° in the c.m.s. The angular dependence is compared with the world experimental data at close energies as well as with the theoretical calculations performed within the framework of the relativistic multiple scattering theory.
P13-2017-34 (959.550)
Azaryan N. et al.
The Compensation of the Noise Due to Angular Oscillations of the Laser Beam in the Precision Laser Inclinometer

An experimental method for the compensation of the noise originated by the laser ray angular oscillations was proposed and experimentally proved for the Precision Laser Inclinometer (PLI). The PLI noise spectral density was reduced by factor 30x and reached 108 rad/Hz1/2 level at the frequency of 5 · 10-5 Hz. The angular noise of a laser ray leaving the one-mode optical fiber in the vacuum and in stabilized temperature conditions has been measured. The amplitude of the oscillations for one-day observation reached 0.46 μrad.

P13-2017-35 (3.706.717)
Azaryan N. et al.
Determination of the Maximum Recording Frequency by the Precision Laser Inclinometer of an Earth Surface Angular Oscillation

For the Precision Laser Inclinometer (PLI) using the I-20A oil, a high-frequency 4~Hz boundary was determined for reliable detection of the Earth surface angular vibrations. The proposed method makes use of the microseismic signal and its processing to expand the PLI working interval for signal reception and allows one to record the narrow frequency-band signals originated by the Earth surface angular oscillations caused by industrial sources.

P13-2017-36 (500.105)
Azaryan N. et al.
The Temperature Stability of 0.005 ° for the Concrete Floor in the CERN Transfer Tunnel No.1 Hosting the Precision Laser Inclinometer

To reach a sensitivity level of ∼ 10-9 rad for the Precision Laser Inclinometer (PLI) for the registration of the Earth surface angular oscillation in the low frequency band of [10-6 Hz; 10-4 Hz] the temperature stability of the CERN Transfer Tunnel No. 1 has been investigated. The daily temperature variation was 0,082 ° for the air and 0,005 ° for the concrete floor. The last result opened the possibility to observe the Earth surface inclination caused by Moon and Sun if the PLI is thermally stabilized by the massive monolithic concrete floor of the tunnel.

P13-2017-49 (165.965)
Meshkov I. N.
Forming of an Ordered Positron Flux

A method for forming a continuous flux of monochromatic positrons with a controlled time of arrival at the target, independent of the start time in a limited start time interval, is suggested. Such an ordered positron flux (OPF) allows one to construct an experimental setup for studies of solid matter structure by positron annihilation spectroscopy (PAS) in its most efficient version the Positron Annihilation Lifetime Spectroscopy (PALS). Simultaneously, by varying the potential of the target, one can control the energy of the positrons on the target and, accordingly, the depth of their penetration into the sample under study, measuring the distribution of defects in depth with high resolution.

E6-2017-50 (672.538)
Khushvaktov J. H. et al.
Monte Carlo Simulations and Experimental Results on Neutron Production in the Spallation Target QUINTA Irradiated with 660 MeV Protons

The activation experiment was performed using the accelerated beam of the Phasotron accelerator at the Joint Institute for Nuclear Research (JINR). The natural uranium spallation target QUINTA was irradiated with protons of energy 660 MeV. Monte Carlo simulations were performed using the FLUKA and Geant4 codes. The number of leakage neutrons from the sections of the uranium target surrounded by the lead shielding and the number of leakage neutrons from the lead shield were determined. The total number of fissions in the setup QUINTA were determined. Experimental values of reaction rates for the produced nuclei in the 127I sample were obtained, and several values of the reaction rates were compared with the results of simulations by the FLUKA and Geant4 codes. The experimentally determined fluence of neutrons in the energy range of 10200 MeV using the (n, xn) reactions in the 127I(NaI) sample was compared with the results of simulations. Possibility of transmutation of the long-lived radionuclide 129I in the QUINTA setup was estimated.

P3-2017-55 (415.473)
Bulavin M. V. et al.
Some Physical Parameters of the Neutron Flux on IBR-2 Beamline No.3 at a Considerable Distance from the Reactor

The current paper covers results of the measurements of the fast neutron flux density by the method of neutron activation analysis (NAA) and measurements of the fluence equivalent to 1 MeV on the radiation damages of silicon detectors (Si-detectors), as well as γ-doses with usage of film-monitors at a considerable distance (38 m) from the IBR-2 water moderator WM-303 on the experimental beamline No.3. The results obtained can be used for determining the coordinates of the samples installed on the radiation research facility for beamline No. 3 aimed at their irradiation within the range of fluences from ∼ 5 · 1011 to 1015 n/cm2 (or with the flux density from ∼ 5 · 105 to 109 n/cm2/s).

P1-2017-59 (558.030)
Zalikhanov B. Zh.
Improvement of Gamma-Detector of Gas-Filled Coordinate Chambers

A new arrangement of converters in the working volume of proportional and drift chambers is proposed for effective detection of X-rays. Positions and geometrical parameters of the converters entirely agree with kinematics of photoelectric absorption of gamma-rays by atoms. The preliminary experimental test confirms the possibility of significantly increasing the gamma detection efficiency of gas-filled detectors.