| 2011 |
|
E7-2011-1 (302.497)
Karamian S.A. et al.
Production of Isomers in Compound
and Transfer Reactions with 4He Ions
A well-known island of nuclear isomerism appears near A = 175-180 due to the
deformation alignment of single-particle orbits at high angular momentum.
This sometimes results in the formation of multi-quasiparticle states with
record spin that are long-lived because of «K-hindrance», i.e.,symmetry
rearrangement. Production methods and spectroscopic studies of these
isomers remain a challenge for modern nuclear reaction and nuclear structure
physics. In the present work, activities were produced by irradiation of
176Yb (97.6%) enriched and natLu targets with 35 MeV 4He
ions from the internal beam of the U200 cyclotron. Induced activities were
analyzed applying methods of radiochemistry and gamma spectroscopy. Yields
of compound and nucleon-transfer reactions were measured and the
isomer-to-ground state ratios were deduced. Calculated results were obtained
using standard procedures to reproduce the ( , xn) cross sections,
and the systematic behavior of the nucleon-transfer yields was established.
The isomer-to-ground state ratios for direct reactions with 4He
ions were examined, resulting in a new characterization of the reaction
mechanism.
|
E2-2011-2 (761.859)
Tokarev M.V. et al.
Search for Signatures of Phase Transition and Critical Point in Heavy-Ion Collisions
The general concepts in the critical phenomena related with the notions of
«scaling» and «universality» are considered. Behavior of various systems
near a phase transition is displayed. Search for clear signatures of the
phase transition of the nuclear matter and location of the critical point in
heavy-ion collisions (HIC) is discussed. The experimental data on inclusive
spectra measured in HIC at RHIC and SPS over a wide range of energies
sNN1/2 = 9-200 GeV are analyzed in the framework of z-scaling. A
microscopic scenario of the constituent interactions is presented.
Dependence of the energy loss on the momentum of the produced hadron, energy
and centrality of the collision is studied. Self-similarity of the
constituent interactions described in terms of momentum fractions is used to
characterize the nuclear medium by «specific heat» and colliding nuclei by
fractal dimensions. Preferable kinematical regions to search for signatures
of the phase transition of the nuclear matter produced in HIC are discussed.
Discontinuity of the «specific heat» is assumed to be a signature of the
phase transition and the critical point.
|
P2-2011-3 (648.725)
Dedovich T.G., Tokarev M.V.
P-adic Coverage Method for Fractal Analysis of Showers
Self-similarity in multiple processes at high energies is considered.
It is assumed that a parton cascade transforms into
a hadron shower with a fractal structure.
The BC method (Box Counting method) used to calculate
the fractal dimension of the cascade is analyzed.
The parton shower with permissible
1/3 parts of the pseudorapidity space corresponding
to the Triad Cantor set was used as the test fractal.
The existence of the optimal
set of bins (the parameter of BC method)
allowing one to find the fractal dimension
with the maximum accuracy was found.
The optimal set of bins is shown to depend
on the law of fractal generation.
The P-adic Coverage method (PaC method) used
for fractal analysis is offered.
This method allows us to determine the fractal
dimension of the shower with the maximum accuracy,
the number of fractal levels and of partons at
branching in the process of development of the shower,
the cascade type (random or regular) and its structure.
The method is shown to be applicable for the analysis of the regular
and random N-ary cascades with permissible
1/k parts of the study space.
|
E10-2011-5 (275.987)
Lebedev S.
Fast Parallel Ring Recognition Algorithm in the RICH Detector of the CBM Experiment at FAIR
The Compressed Baryonic Matter (CBM) experiment at the future FAIR facility
at Darmstadt will measure dileptons emitted from the hot and dense phase in heavy-ion collisions.
In case of an electron measurement, a high purity of identified electrons is required in order to suppress
the background. Electron identification in CBM will be performed by a Ring Imaging Cherenkov (RICH) detector
and Transition Radiation Detector (TRD). Very fast data reconstruction is extremely important for CBM because
of the huge amount of data which has to be handled. In this contribution, a parallelized ring recognition
algorithm is presented. Modern CPUs have two features, which enable parallel programming. First, the SSE
technology allows using the SIMD execution model. Second, multicore CPUs enable the use of multithreading.
Both features have been implemented in the ring reconstruction of the RICH detector. A considerable speedup
factor from 357 to 2.5 ms/event has been achieved including preceding code optimization for Intel Xeon X5550
processors at 2.67 GHz.
|
E14-2011-6 (809.042)
Didyk A.Yu. et al.
Depth Concentrations of Deuterium Ions Implanted into Some Pure Metals and Alloys
Pure metals (Cu, Ti, Zr, V, Pd) and diluted Pd alloys (Pd-Ag, Pd-Pt, Pd-Ru, Pd-Rh)
were implanted by 25-keV deuterium ions at fluences in the range
(1.2-2.3)  1022 D+/m2.
The post-treatment depth distributions of deuterium ions were measured 10 days and three months after the
implantation by using Elastic Recoil Detection Analysis (ERDA) and Rutherford Backscattering (RBS).
Comparison of the obtained results allowed us to make conclusions about relative stability of deuterium
and hydrogen gases in pure metals and diluted Pd alloys. Very high diffusion rates of implanted deuterium
ions from V and Pd pure metals and Pd alloys were observed. Small-angle X-ray scattering revealed formation
of nanosized defects in implanted corundum and titanium.
|
E14-2011-7 (1.340.965)
Didyk A.Yu. et al.
Comparative Analysis of Deuterium Ions Implanted and Deuterium Atoms Saturated at High Pressure
in Pure Pd and Pd Diluted Alloys
Pd and its diluted alloys (Pd-Ag, Pd-Pt, Pd-Ru, Pd-Rh) were implanted by 25 keV
deuterium ions at a fluence interval of
(1.2-2.3) 1022 D/m2. The same property alloys
were saturated by deuterium atoms using high pressure chamber during long period with temperature
stabilization and electrical resistance measurement of standard Pd wire. The post-treatment depth
distributions of deuterium and accompanied hydrogen atoms were measured immediately after implantation
(ten days) and after definite time period (three months) after saturation with the usage of elastic recoil
detection analysis (ERDA). After two months, the measurements were repeated. The comparison of obtained
results in both series of studies allowed one to make an important observation of a relative stability
of deuterium and hydrogen atoms in pure Pd and its diluted alloys.
|
E14-2011-8 (463.377)
Didyk A.Yu. et al.
ERD Studies of D-ion Depth Distributions after Implantation into Some Pure Metals and Alloys
This paper presents a report on experimental results of depth distributions of deuterium
ions implanted with 25 keV energy at a fluence interval
of (1.2-2.3) 1022 D+/m2
into samples of pure metals (Cu, Ti, Zr, V, Pd)
and diluted Pd alloys (Pd-Ag, Pd-Pt, Pd-Ru, Pd-Rh). The post-treatment depth distributions
of deuterium and hydrogen atoms were measured within a few hours after implantation with the use
of elastic recoil detection (ERD) analysis. After three months the measurements were repeated.
The comparison of the obtained results in both series of studies allowed us to make an important
observation of the desorption rates of implanted deuterium atoms from pure metals and diluted Pd alloys.
The maximum measured concentrations of deuterium atoms in pure Zr and Ti foils with relatively small desorption
rate of deuterium atoms within three months after implantation were observed. Also a very high spreading of
deuterium atom distributions was observed in all the measured pure metals and alloys. It can be explained
by the large diffusion coefficients of deuterium and extremely fast kinetics.
|
P11-2011-9 (574.845)
Belyakov D.V. et al.
Information System DoctorDoc of Electronic Document Circulation
Some aspects of the development and introduction of an information
system of electronic document circulation at a real enterprise have been discussed.
Advantages and disadvantages of the home developed and purchased systems are shown. Questions
of constructing the document circulation systems based on principally new approaches, the so-called
process-oriented document circulation, are investigated. The main concepts of designing such systems
are given, their advantages over the existing service-oriented systems are demonstrated. Some examples
of work with the process-oriented electronic document circulation system implemented in test operation
at LIT JINR are presented.
|
E2-2011-10 (703.735)
Tokarev M., Zborovsk I.
Energy Scan in Heavy-Ion Collisions and Search for a Critical Point
Experimental data on inclusive spectra measured in heavy-ion
collisions at RHIC and SPS over a wide energy range  = 9-200 GeV are
analyzed in the framework of z-scaling. A microscopic scenario of constituent interactions
in the framework of this approach is discussed. Dependence of the energy loss on the momentum
of the produced hadron, energy and centrality of the collision, is studied. Self-similarity
of the constituent interactions in terms of momentum fractions is used to characterize the nuclear
medium by «specific heat» and colliding nuclei by fractal dimensions. Preferable
kinematic regions for search for signatures of the phase transition of the nuclear matter produced
in heavy-ion collisions (HIC) are discussed. Discontinuity of «specific heat» is assumed
to be a signature of the phase transition and the Critical Point.
|
11-2011-13
Ìóçàôàðîâ Ä. Ç.
×èñëåííîå èññëåäîâàíèå íåêîòîðûõ íåëèíåéíûõ ýâîëþöèîííûõ ìîäåëåé êîíäåíñèðîâàííûõ ñîñòîÿíèé
Àâòîðåô. äèñ. ... êàíä. ôèç.-ìàò. íàóê
(ðóñ)
|
10-2011-14
Ëåáåäåâ Ñ. À.
Ìàòåìàòè÷åñêîå îáåñïå÷åíèå äëÿ ðåêîíñòðóêöèè êîëåö ÷åðåíêîâñêîãî èçëó÷åíèÿ è èäåíòèôèêàöèè ýëåêòðîíîâ â RICH äåòåêòîðå ýêñïåðèìåíòà ÑÂÌ
Àâòîðåô. äèñ. ... êàíä. ôèç.-ìàò. íàóê
(ðóñ)
|
P9-2011-15 (345.988)
Yudin I.P., Panacik V.A., Tyutyunnikov S.I.
Additional Transport Channel of Carbon Ions for Biological Research at the Nuclotron of JINR
The paper deals with the construction of the beam 12C+6
transport line for biomedical research at the Nuclotron accelerator complex, JINR.
We have studied the scheme and modes of magneto-optical elements of the channel.
The results of calculations of the investigated beam transport of carbon ions,
are presented. The algorithms to control the carbon ion beam in the transportation system,
are discussed. The choice of the magneto-optical system is motivated. The graphs of the beam
envelopes in the channel, are given. The scanning control beam functions are considered.
|
P11-2011-16 (471.712)
Yudin I.P., Perepelkin E.E., Tyutyunnikov S.I.
Using the CUDA Programming Environment for Modeling
the Ions Beam Line Injection Taking into Account the Space Charge
In the paper the simulation was made of the injection line beam in a
synchrotron for the JINR VBLHEP project «Development and Creation of the
Prototype of a Complex for Radiotherapy on Heavy Ions Beams at the Nuclotron-M».
Parameters were selected for the injection beams transport line into a synchrotron with
intensities of 25 to 100 mA taking into account the space charge effect. The simulation
was performed using the method of macroparticles (PIC). In order to accelerate the computational process,
an approach was used to massively parallel computing on graphics processors (GPU), using the technology
CUDA. A 66 times accelerating of computing process has been obtained for Tesla C1060 computing module
in comparison with single core CPU at 2.4 GHz.
|
E14-2011-17 (846.014)
Tsibakhashvili N.Ya. et al.
Microbial Synthesis of Silver Nanoparticles by
Streptomyces glaucus and Spirulina platensis
For the first time in Georgia a novel actinomycete strain Streptomyces glaucus 71 MD
isolated from a soy rhizosphere has been used for microbial synthesis of silver nanoparticles. The Transmission Electron Microscope
(TEM) images revealed that most of the particles produced by these
microorganisms from AgNO3 are spherical-like in shape with an average size of
13 nm. The Scanning Electron Microscope (SEM) allowed one to observe extracellular
synthesis of nanoparticles, which has many advantages from the point of view
of applications. Production of silver nanoparticles proceeds
extracellularly with the participation of another microorganism, blue-green
microalgae Spirulina platensis. It is shown that the production rate of the
nanoparticles depends not only on the initial concentration of AgNO3
but also varies with time in a no monotonic way.
|
P14-2011-18 (2.348.961)
Belushkin A.V., Kozlenko D.P., Rogachev A.V.
Synchrotron and Neutron Scattering Methods for Studies of Properties of
Condensed Matter: Complementarity or Competition?
A comparative analysis of modern possibilities of synchrotron
radiation and neutron scattering methods for studies of collective
excitations, atomic and magnetic structure of condensed matter is presented.
The opportunities for research using techniques based on inelastic
scattering, diffraction and small-angle scattering of synchrotron radiation
and neutrons, as well as synchrotron radiation resonance elastic and
inelastic scattering and absorption, are considered. The application limits
and complementarity of the considered synchrotron radiation and neutron
scattering methods are discussed.
|
E14-2011-19 (296.152)
Gonchigsuren M., Deleg S., Olafsson S.
Hydrogen Uptake in Mg-Pd Thin Films
The work is focused on the study of the possibility to reduce the binding
energy of hydride formation by alloying metal magnesium with transition metal palladium.
Hydrogen uptake in Mg-Pd films, with composition ranging from
Mg0,95Pd0,05 to Mg0,5Pd0,5 was investigated by in-situ resistance measurements.
Experimental data were used to calculate the dependence p- R-T and isotherms showing the
enthalpy change were drawn. The data were then compared with the bulk values for
MgH2 and PdH0,6. As a result, the authors were bound to conclude that the enthalpy
change or the binding energy of hydride formation was reduced from -0.77 eV/H2 down
to -0.65  -0.5 eV/H2.
|
E2-2011-20 (135.427)
Beshtoev Kh.M.
Important Remarks on the Problem of Neutrino Passing through the Matter
It is supposed that resonance enhancement of neutrino oscillations
in the matter appears while a neutrino is passing through the
matter. It is shown that Wolfenstein's equation, for a neutrino
passing through the matter, has a disadvantage (it does not
take into account the law of momentum conservation; i.e., it is
supposed that in the matter the neutrino energy changes, but its
momentum does not). It leads, for example, to changing the
effective mass of the neutrino by the value 0.87 102 eV
from a very small value of energy polarization of the matter
caused by the neutrino, which is equal to 5 1012 eV. After
removing this disadvantage (i.e., taking into account that neutrino momentum also changes in matter) we
have obtained a solution to this equation. In this solution a very
small enhancement of neutrino oscillations in the solar matter appears
due to the smallness of the energy polarization of the matter
caused by the neutrino. Two possible solutions to this equation are
also given for the limiting cases.
|
P9-2011-21 (772.429)
Karamyshev O.V.
A Code for Simulation of Beam Dynamics at Injection into Circular Accelerators
It is important to perform a great number of numeric simulations for
designing injection systems of circular accelerators. Initially, we
calculate electromagnetic fields of the elements of injection lines and then
simulate beam dynamics in these fields. This paper presents the DYN code,
created in Matlab, which can use results from electromagnetic field
simulations performed by Ñomsol, CST Studio or ANSYS. The code integrates
differential equations of motion of the charged particles in the
electromagnetic field. Simulations of the spiral electrostatic inflector,
dedicated for axial injection of the beam into the cyclotron center, and the
beam line for antiproton injection into the AD-REC electrostatic ring are
presented as examples.
|
P14-2011-22 (962.059)
Avdeev M.V., Aksenov V.L., Feoktystov A.V.
On Determination of «Atomic» and «Magnetic» Sizes
of Nanoparticles in Ferrofluids by Means of Small-Angle Neutron Scattering
Main factors influencing the determination of the sizes of magnetic
nanoparticles in ferrofluids by the nuclear («atomic» size) and magnetic
(«magnetic» size) components of the small-angle neutron scattering (SANS)
are considered. They include particle interaction effects, colloidal aggregation and particle
polydispersity. It is shown that ignoring these factors in simplified scattering analysis
(use of only Guinier analysis at the contrast variation) may result in principally incorrect
interpretations. The efficient and reliable SANS application for the structure analysis of ferrofluids
in the frame of a complex approach combining several complementary methods is demonstrated.
|
E1-2011-24 (686.681)
Baldin A. et al.
Relativistic Nuclear Technology (RNT) for Energy Production and
Utilization of Spent Nuclear Fuel. The Results of First Experiments
on Physical Justification of RNT
An essentially new scheme of the electronuclear method -
relativistic nuclear technology (RNT) - is considered. This is based
on the use of the neutron spectrum forming in the deep
subcritical active core,
much harder than created in chain fission process.
It is shown that an application of RNT for utilization of the radioactive
nuclear wastes and energy production seems to be very promising. The results of the first experiments carried out at
JINR demonstrate the validity of basic principles of RNT. In particular,
these point to the essential (twofold) growth of beam power gain in massive
(315 kg) uranium target irradiated with deuterons with increasing energy
from 1 to 4 GeV.
|
E5-2011-28 (190.275)
Zhidkov P.E.
On Radially Symmetric Solutions of the Equation
-u + u = |u|p-1u. An ODE Approach
Questions of the existence in a ball of radially symmetric
solutions of the equation indicated in the title with the Dirichlet
zero boundary conditions are studied in many publications and, generally
speaking, there was
obtained more or less complete answer to these questions. It is known now
that if the dimension
of the space d  3 and 1 < p < (d + 2)/(d - 2)
or if d = 2 and p > 1, then
for any integer
l 0 this problem in a ball or in the entire space
has a radially symmetric solution with precisely l zeros as a function of r = |x|.
If d 3
and p (d + 2)/(d - 2), then the problem in the entire space has no nontrivial solution. For the
first time, this problem was studied by a variant of the variational method. However, it is
known to the specialists in the field that it is also interesting to obtain the same results by
using methods of the qualitative theory of ODE. In the present paper, we shall give a simple
proof of the above result in this way. An earlier proof of this result of the other authors is
essentially more complicated than our one.
|
E5-2011-29 (1.342.088)
Gevorkyan A.S., Abajyan H.G., Sukiasyan H.S.
A New Parallel Algorithm for Simulation of a Spin-Glass System
on Scales of Space-Time Periods of an External Field
We study the statistical properties of an ensemble of disordered
1D spatial spin chains (SSCs) of certain length in the external
field. On nodes of spin-chain lattice the recurrent equations and
corresponding inequality conditions are obtained for calculation of
local minimum of a classical Hamiltonian. Using these equations for
simulation of a model of 1D spin glass an original
high-performance parallel algorithm is developed. Distributions of
different parameters of unperturbed spin glass are calculated. It is
analytically proved and shown by numerical calculations that the
distribution of the spin-spin interaction constant in the Heisenberg
nearest-neighboring Hamiltonian model as opposed to the widely used
Gauss-Edwards-Anderson distribution satisfies the L vy
alpha-stable distribution law which does not have variance. We have
studied critical properties of spin glass depending on the external
field amplitude and have shown that even at weak external fields in
the system strong frustrations arise. It is shown that frustrations
have a fractal character, they are self-similar and do not disappear
at decreasing of calculations area scale. After averaging over the
fractal structures the mean values of polarizations of the
spin glass on the scales of external field's space-time periods are
obtained. Similarly, Edwards-Anderson's ordering parameter depending
on the external field amplitude is calculated. It is shown that the
mean values of polarizations and the ordering parameter depending on
the external field demonstrate phase transitions of first order.
|
E11-2011-31 (1.712.423)
Ayryan E.A. et al.
Representations of Guided Modes of Integrated-Optical Multilayer Thin-Film Waveguides
We investigate the guided propagation (eigen) modes in the regular
multilayer dielectric waveguides. The waveguide involves several
nonmagnetic media with real dielectric constants, and the description of the
corresponding wave equations is done in terms of transverse and longitudinal
field components in Cartesian coordinates.
In order to allow comparison with various previous approaches, the solutions
of the equations of the guided modes are expressed in terms of both real
valued and complex valued fundamental systems of solutions. For each of them
we derive the appropriate form of the dispersion relation for the TE and
TM~modes of three-layer and four-layer waveguides. Stable methods of solving
the resulting nonlinear transcendental algebraic dispersion equations and
related systems of linear algebraic equations are implemented and used for
the calculation of the fields of the waveguide modes.
|
E3-2011-33 (2.085.337)
Sukhovoj A.M., Khitrov V.A.
Modified Model of Neutron Resonances Width Distribution. Results of
Reduced Neutron Widths Approximation for Mass Region
35  A 249
The distributions of the reduced neutron widths of s-, p- and d-resonances of
nuclei of any type from nuclear mass region 35 A 249 were
approximated with maximal precision by the model which presents experimental
data set as a superposition of a maximum of four independent neutron
amplitudes. Under the assumption that each of these amplitudes has the Gauss
distribution with the unique maximum there were determined the most probable
values of contribution of each amplitude in summary width distribution,
their most probable mean values and dispersions. Comparison of the obtained
 2 values with value 2 at description of the
experimental data by one distribution of neutron amplitudes with best fitted
parameters shows that all widths from more than 157 analyzed data sets can
have different types of wave functions.
|
P9-2001-34 (291.600)
Karamyshev O.V., Karamysheva G.A., Skripka G.M.
Beam Losses Due to Charge Exchange with the Residual Gas in the Cyclotron
This paper describes methods and results of simulation of light and heavy
ion beams losses due to charge exchange with the residual gas in the
cyclotron. A code IONLOSS was created which can simulate beam losses due to
charge exchange with the residual gas while moving in the vacuum chamber.
The results of simulations of 40Ar8+ and 84Kr17+ ion
beams losses in the CYTRACK cyclotron, which accelerates heavy ions up to an
energy of 2.4 MeV/u, and losses of H2+, 12C6+ ions in
the C400 cyclotron (IBA, Belgium), which accelerates ions up to 260 MeV and
400 MeV/u, correspondingly, are presented as examples.
|
6-2011-35
Àêñåíîâ Í. Â.
Ðàäèîõèìè÷åñêàÿ äèàãíîñòèêà ñîðáöèîííîãî ïîâåäåíèÿ òèòàíà, öèðêîíèÿ, ãàôíèÿ è òîðèÿ êàê ëåãêèõ ãîìîëîãîâ ðåçåðôîðäèÿ
Àâòîðåô. äèñ. ... êàíä. õèì. íàóê
(ðóñ)
|
E3-2011-36 (1.155.588)
Sukhovoj A.M., Khitrov V.A.
Modified Model of Neutron Resonance Widths Distribution. Results of
Total Gamma-Widths Approximation
Functional dependences of probability to observe
given  0n value
and algorithms for determination of the most probable magnitudes of the
modified model of resonance parameter distributions were used for analysis of
the experimental data on the total radiative widths of neutron resonances.
As in the case of neutron widths, precise description of the
 spectra requires a superposition of three and more probability distributions
for squares of the random normally distributed values with different
nonzero average and nonunit dispersion. This result confirms the
preliminary conclusion obtained earlier at analysis of 0n that practically in all 56~tested sets of total gamma widths there are several groups
noticeably differing from each
other by the structure of their wave functions.
In addition, it was determined that radiative widths are much more
sensitive than the neutron ones to resonance wave functions structure.
Analysis of early obtained neutron reduced widths distribution parameters for 157
resonance sets in the mass region of nuclei 35 A 249 was also performed. It was shown
that the experimental values of widths can correspond with high probability
to superposition of several expected independent distributions with
their nonzero mean values and nonunit dispersion.
|
1-2011-38
Êðèâåíêîâ Ä. Î.
Èññëåäîâàíèå êîãåðåíòíîé äèññîöèàöèè ðåëÿòèâèñòñêèõ ÿäåð 9C
Àâòîðåô. äèñ. ... êàíä. ôèç.-ìàò. íàóê
(ðóñ)
|
039(E15-2011-39) (1.412.652)
Svoboda O. et al. (On behalf of the Collaboration «Energy and Transmutation of Radioactive Waste»)
The Study of Spallation Reactions, Neutron Production and Transport in a
Thick Lead Target and Uranium Blanket during 1.6 and 2.52 GeV Deuteron
Irradiation
Neutron activation detectors were used to study the
neutron field in the setup «Energy plus Transmutation» consisting of a thick
lead target and natural uranium blanket. This setup was exposed to 1.6 and
2.52 GeV deuteron beam from the Nuclotron accelerator. The experiment is a
part of systematic study of neutron field and transmutation using proton and deuteron beams in the energy
range from 0.7 up to 4 GeV. The experimental data were compared with the
results of the MCNPX simulations and with the data from the previous
experiments. A good agreement within the statistical uncertainties was
observed.
|
E14-2011-40 (250.479)
Balasoiu M. et al.
Particle Concentration Effects on the Ferrofluids Based Elastomers Microstructure
Combination of magnetic and elastic properties of magnetic elastomer
leads to diverse phenomena exhibited by this material in magnetic fields and opens new possibilities
for technological applications. Various structures could be formed inside the material or the already
existing structures would be changed due to the application of a magnetic field. A new rubber material
containing magnetized anisotropic nano-clusters with the use of ferrofluids is proposed. By means of
small-angle neutron scattering specific variations of the structure factor and interparticle correlation
length with the particle concentration and the magnetic field imposed during polymerization are
found and discussed.
|
P13-2011-43 (206.789)
Baturitskii M.A. et al.
Detector with a Profile-Based Cathode and the Two-Coordinate Pad-Strip Readout System
A detector with a profile-based cathode and a pad-strip cathode
readout system is experimentally investigated. Cathode pads arranged along
each anode wire are diagonally interconnected and make up strips that cross
the detector at an angle with respect to the anode wire. Two cathode
coordinates and an anode wire allow unique identification of events with
high multiplicity in one detector.
|
P13-2011-44 (141.861)
Kuchinskii N.A. et al.
Using the Cathode Surface of Straw Tube for Measuring the Track Coordinates along the Wire
Currently, the coordinate detectors based on straw tubes are widely used in
high energy physics. This is caused by a high accuracy of the radial
coordinate measurement using the drift time and a small amount of matter in
the way of the measured particles. So far, the remaining problem is the
measurement of the coordinate along the wire. This paper proposes a method
for measuring the hit coordinates along the wire in a straw tube detector
using the signals from the cathodes of the detector.
|
P19-2011-45 (1.058.686)
Aksenova S.V., Belov O.V., Lhagva O.
Modeling the Spatial Distribution of the Volumic Radiant Energy
and Absorbed Dose of Radiation in the DNA Structure under Accelerated Heavy Ions
Model approaches are developed to the description of the mechanism of the
formation of different types of atomic-level DNA lesions under accelerated
heavy ions. The radial distribution of volumic radiant energy and the
absorbed dose are calculated in accelerated 4He, 12C, and
40Ar ion tracks in the energy range of 3-20 MeV/nucleon. The spatial
location of the atoms of an adenine-thymine nucleotide pair is compared
with the calculated radial dose and volumic radiant energy distribution.
|
E6-2011-46 (631.186)
Izosimov I.N., Kalinnikov V.G., Solnyshkin A.A.
Fine Structure of Strength Functions for Gamow-Teller
and First-Forbidden  +/EC Transitions
The experimental measurement data on the fine structure of S(E)
in spherical and deformed nuclei are analyzed. The modern nuclear spectroscopy
methods allowed the split of the peaks caused by nuclear deformation to be
revealed in S(E) for transitions of the Gamow-Teller (GT) type.
The resonance nature of S(E) for first-forbidden (FF) transitions
in both spherical and deformed nuclei is experimentally proved. It is shown
that at some nuclear excitation energies FF transitions can be comparable in
intensity with GT transitions.
|
P15-2011-47 (889.200)
Rodin A.M. et al.
Mass-Spectrometer MASHA - Testing Results on Heavy Ion Beam
Description of mass-spectrometer MASHA, developed for the mass
identification of superheavy elements, is given. The efficiency and
operation speed in the off-line mode were measured with four calibrated
leakages of noble gases. The total efficiency and operation speed of
mass-spectrometer with hot catcher and ECR ion source were determined using
the 40Ar beam. The test experiment was carried out by measuring the
alpha decay of Hg and Rn isotopes, produced in fusion reactions
40Ar + natSm  nat - xnHg + xn and
40Ar + 166Er 206 - xnRn + xn,
in the focal plane of mass-spectrometer. The operation
speed of the given technique and relative yields of isotopes in the test
reactions were determined.
|
E2-2011-48 (210.597)
Beshtoev Kh.M.
About Oscillations in the System of K0 Mesons
This work considers K0-,  -meson mixings and oscillations
via K01-, K02-meson states at strangeness violation
by the weak interactions and
K01-, K02-meson mixings and oscillations via
KS-, KL-meson states at CP
violation by the weak interactions without and with taking into account decay widths. We work in
the framework of the masses mixing scheme. It is shown that
K01-(KS-)meson states appear at
big distances from the K0-mesons source after their decays
( L  S
(2
2))
due to oscillations of residual K02 (KL) mesons and
then again we see short-living
K01 (KS)
mesons. It is implied that
KL  KS
meson oscillations are absent. The case is also considered
when at CP violation unitarity is violated, but orthogonality of KS,
KL states remains. The general
expressions for probabilities of meson oscillations (transitions) are given.
|
P9-2011-49 (716.899)
Kalmykov A.V. et al.
A Stand for Simulation and Test of the Magnetic Components of the
Focus Beam and Transport Systems for Accelerator LUE-200, Installation IREN
Technical parameters and physical abilities of the equipment stand for
simulation and testing of the dipole electromagnet to focus and transport
the beam of the linear accelerator (LUE-200) are described. The
overall design of the stand, a description of the magnetometer and the
positioning system of Hall sensors are presented. The software of the stand has been
developed.
|
P13-2011-50 (489.154)
Kalmykov A.V., Strekalovskiy O.V., Strekalovskaya E.V.
The SM-200 Step Motor Control Device
One of the main nodes of the stand for testing and modeling solenoid coils,
which define the focus of the beam of charged particles in the accelerator LUE-200 (IREN),
is a device for positioning Hall sensors (HS). The mechanism of movement of the platform where
HS are installed is activated by the step motor. This paper describes the control device
of the step motor SM-200.
|
9-2011-51
Êàðàìûøåâ Î. Â.
Äèíàìèêà íèçêîýíåðãåòè÷åñêîãî ïó÷êà ïðè èíæåêöèè â öèêëè÷åñêèå óñêîðèòåëè è íàêîïèòåëè
Àâòîðåô. äèñ. ... êàíä. ôèç.-ìàò. íàóê
(ðóñ)
|
E1-2011-52 (712.538)
Adam J. et al.
A Study of Rates of (n,f), (n,), and
(n,2n) Reactions in
natU and 232Th Produced by the Neutron Fluence
in the Graphite Setup (GAMMA-3) Irradiated by 2.33 GeV Deuteron Beam
Spallation neutrons produced in a collision of 2.33 GeV
deuteron beam with the large lead target are moderated by the thick graphite
block surrounding the target and used to activate the radioactive samples of
natU and Th put at the three different positions, identified as holes
«a», «b» and «c» in the graphite block. Rates of the (n,f), (n,),
and (n,2n) reactions in the two samples are determined using the gamma
spectrometry. Ratio of the experimental reaction rates, R(n,2n)/R(n,f)
for the 232Th and natU are estimated in order to understand the
role of reactions of (n, xn) type in Accelerator Driven Subcritical
Systems. For the Th-sample, the ratio is ~ 54(10)% in case of hole
«a» and ~ 95(57)% in case of hole «b» compared to 1.73(20)% for
the hole «a» and 0.710(9)% for the hole «b» in case of the
natU sample. Also the ratio of fission rates in uranium to thorium,
natU(n,f)/232Th(n,f), is ~ 11.2(17) in case of hole «a» and 26.8(85) in
hole «b». Similarly, ratio 238U(n,2n)/232Th(n,2n) is 0.36(4)
for the hole «a» and 0.20(10) for the hole «b» showing that 232Th is
more prone to the (n, xn) reaction than 238U. All the experimental
reaction rates are compared with the simulated ones by generating neutron
fluxes at the three holes from MCNPX 2.6c and making use of LA150 library of
cross sections. The experimental and calculated rates of all the
three reactions are in good agreement. The transmutation power of the setup
is estimated using the rates of (n,) and (n,2n) reactions for
both the samples in the three holes and compared with some of the results of
the «Energy plus Transmutation» setup and TARC experiment.
|
P19-2011-53 (1.077.986)
Hlinkova E. et al.
Effect of -Irradiation on Euglena gracilis Algae
Given the prospects for using Euglena algae as part
of the biological systems of human life support in long-term space flights, we studied the effects
of low doses of radiation and genotype influence on the radiosensitivity of Euglena cells.
Irradition of several Euglena gracilis strains with 60Co
-rays shows that strain Z
is the most radioresistant. Its chloroplastless derivate OFL strain shows increased radiosensitivity.
The E. bacillaris strain and its derivates W3 and W10 without chlorophyll have intermediate
radiosensitivity. Irradiation up to 10 Gy had the hormesis effect on the initial strains, and it is
only above 100 Gy that cell death was observed. The hormesis effect was observed concerning both
radioresistance and growth rate. The use of methylen blue and fluorochrome dyes allows a rapid
estimation of the share of the living and dead cells. A comparison of two survival rate tests shows
that the classical method of plating on a growth medium yields an increased death rate because this
method does not take into account the living non-dividing cells.
|
E4-2011-54 (160.636)
Ignatovich V.K.
On EPR Paradox, No Entanglement Theorem for Separate Particles and Consequences
EPR paper [1] is reconsidered. Unavoidable redefinition of
values of physical quantities is shown to resolve the paradox. Entangled states according to EPR
logic are shown not to exist, and therefore nonlocality in quantum mechanics is absent. Violation of Bell's inequalities
in coincidence experiments with parametrically downconversion photons is shown not to mean a rejection of
quantum mechanical locality. Experiments to check the natural correlation of photon polarizations without
entangled states are proposed. Consequences of absence of the entangled states are discussed.
|
P10-2011-55 (371.090)
Galaktionov V.V.
GridCom, Grid Commander: Graphical Interface for Grid Jobs and Data Management
GridCom - the software package for maintenance of automation of
access to means of distributed system Grid (jobs and data). The client part,
executed in the form of Java-applets, realises the Web-interface
access to Grid through standard browsers. The executive part Lexor
(LCG Executor) is started by the user in UI (User Interface)
machine providing performance of Grid operations.
|
P17-2011-56 (168.412)
Nazmitdinov R.G., Chizhov A.V.
Entanglement in a Two-Electron Quantum Dot in a Magnetic Field
Entanglement features of the ground state in an exactly solvable model of a two-electron
quantum dot are analysed. It was found that a degree of entanglement increases
with the interaction strength between electrons, irrespective of a shape of the
confining potential in a quantum dot. The magnetic field destroys the entanglement
of electrons. However, the entanglement in deformed quantum dots is more stable
to the effect of the magnetic field.
|
P15-2011-58 (3.515.393)
Karnaukhov V.A.
Hot and Boiling Nuclei (To the Centenary of E.Rutherford's Discovery)
The paper is the report given by the author at the JINR meeting devoted to the
centenary of the atomic nucleus discovery by E.Rutherford. The
properties of nuclei with the excitation energy comparable to the total
binding energy are considered.
|
P13-2011-59 (1.781.474)
Astabatyan R.A. et al.
Parallel Plate Avalanche Detector for Identification of Low Energy Ions
The set-up containing avalanche detectors, a multiwire proportional chamber
and a strip silicon detector is presented. The main part of the set-up
is a low pressure avalanche wireless detector for energy losses and
time-of-flight measurements of ions in the range of Z 1 and
E = 1-10 MeV. The results of  -particles from 226Ra measurement
as well as for
(p, Be, C, O) ions identification obtained on the cyclotron ITS-100 FLNR
JINR are presented.
|
E11-2011-60 (567.640)
Gevorkyan A.S., Abajyan H.G., Ayryan E.A.
On Modeling of Statistical Properties of Classical 3D Spin Glasses
We study statistical properties of 3D classical spin glass layer of certain width
and infinite length. The 3D spin glass is represented as an ensemble of disordered 1D spatial spin
chains (SSC) where interactions are random between spin chains (nonideal ensemble of 1D SSCs).
It is proved that in the limit of Birkhoff's ergodic hypothesis performance, 3D spin glasses can be generated
by Hamiltonian of disordered 1D SSC with random environment. Disordered 1D SSC is defined on a regular
lattice where one randomly oriented spin is put on each node of lattice. Also, it is supposed that each
spin randomly interacts with six nearest-neighboring spins (two spins on lattice and four in the environment).
The recurrent transcendental equations are obtained on the nodes of spin-chain lattice. These equations,
combined with the Silvester conditions, allow step-by-step construction of spin chain in the ground state
of energy where all spins are in minimal energy of classical Hamiltonian. On the basis of these equations
an original high-performance parallel algorithm is developed for 3D spin glasses simulation. Distributions
of different parameters of unperturbed spin glass are calculated. In particular, it is analytically proved and
numerical calculations show that the distribution of spin-spin interaction constant in Heisenberg
nearest-neighboring Hamiltonian model, as opposed to widely used Gauss-Edwards-Anderson distribution,
satisfies Lvy alpha-stable distribution law which does not have variance. A new formula is proposed
for construction of partition function in the form of one-dimensional integral on energy distribution of 1D SSCs.
|
1-2011-61
Áîëüøàêîâà À. Å.
Êàëèáðîâêà âðåìÿïðîåêöèîííîé êàìåðû ýêñïåðèìåíòà HARP è èçìåðåíèå ñå÷åíèé ðîæäåíèÿ àäðîíîâ â àäðîí-ÿäåðíûõ âçàèìîäåéñòâèÿõ íà òàíòàëå è ñâèíöå äëÿ ïðîåêòèðîâàíèÿ íåéòðèííîé ôàáðèêè
Àâòîðåô. äèñ. ... êàíä. ôèç.-ìàò. íàóê
(ðóñ)
|
P9-2011-62 (834.058)
Becher Yu. et al.
The Positioning Device of Beam Probes for Accelerator LUE-200
The description of a device for the positioning of sliding beam probes which
is the part of the beam diagnostic system for the LUE-200 electron linac of IREN installation
is presented. The device provides remote control of input--output operation of beam probes
of five diagnostic stations established in an accelerating tract and in the beam transportation
channel of the accelerator.
|
1-2011-63
Æåì÷óãîâ À. Ñ.
Ýêñïåðèìåíòàëüíîå èññëåäîâàíèå âçàèìîäåéñòâèÿ àäðîíîâ ñ ÿäðàìè áåðèëëèÿ äëÿ ðàçâèòèÿ ôåíîìåíîëîãè÷åñêèõ ìîäåëåé ÿäåðíûõ ðåàêöèé
Àâòîðåô. äèñ. ... êàíä. ôèç.-ìàò. íàóê
(ðóñ)
|
P6-2011-64 (420.424)
Maslov O.D. et al.
Determination of Aluminum and Silicon Content in Water Samples
by Nuclear Physical Methods Using XRFA and the MT-25 Microtron
Some of element contents in the samples have been determined by nuclear
physical methods (XRFA, GAA and NAA).The possibility of determining Mg, Al,
and Si content in water samples has been studied. The detection limits of
0.03 for Al and 0.1 mg/l for Si in water samples have been obtained.
Monitoring of the aluminum and silicon content in water is important because
the high concentration of aluminum or the low content of silicon in drinking
water may be risk factors for Alzheimer's disease.
|
P9-2011-65 (584.046)
Azaryan N.S. et al.
The Modeling of the Single-Cell Superconducting Niobium Resonator for an Accelerator of Electrons and Positrons
The modeling of the accelerator section consisting of superconducting niobium
resonators for the International Linear Collider (ILC) has been made in the
conditions of a maximal energy transfer to electrons, travelling along the
resonator axis. The mathematical model and the program package have been
created for the modeling of the electric characteristics and the shape of
the single-cell resonator. The computer-based synthesis of the resonator
shape was developed providing the required electrical characteristics. The
perspective design variants of a single-cell resonator have been found with
the quality up to 1010 at working frequency 1.3 GHz for the design
optimization and the elaboration of a single-cell resonator. The electric
characteristics of a chain of single-cell resonators have been calculated.
|
3-2011-67
Ïîêîòèëîâñêèé Þ. Í.
Èññëåäîâàíèÿ ãåíåðàöèè è âçàèìîäåéñòâèé óëüòðàõîëîäíûõ íåéòðîíîâ
Àâòîðåô. äèñ. ... êàíä. ôèç.-ìàò. íàóê
(ðóñ)
|
1-2011-70
Ïðîêîøèí Ô. Â.
Èçìåðåíèå ìàññû òîï-êâàðêà íà îäíîëåïòîííîé âûáîðêå ñîáûòèé ýêñïåðèìåíòà CDF
Àâòîðåô. äèñ. ... êàíä. ôèç.-ìàò. íàóê
(ðóñ)
|
E14-2011-71 (219.982)
Anghel L. et al.
SAXS Studies of Ultrasonicated Dispersions of Biomineral Particles Produced by Klebsiella oxytoca
A small-angle X-ray scattering experiment was performed
on biogenic nanoparticles produced by bacteria Klebsiella oxytoca. Structural investigations
of ultrasonic assisted samples of different concentrations of water dispersed
particles were performed. Model calculations and fitting procedures revealed
scattering objects of an elongated shape of 6.73  0.16 nm radius of gyration.
|
P9-2011-72 (14.825.189)
Àverichev À.S. et al.
Results of 42nd and 43rd Nuclotron Runs
The main goal of the 42nd Nuclotron run (December 2010),
completing the Nuclotron-M project, was commissioning of a new power supply
and protection system for the structural magnets and lenses. As a result,
the stable and safe work of the magnetic system was demonstrated at a design magnet
field equal to 2?T. During the 43rd run, performed in the framework of the new project
«Nuclotron-NICA», commis-sioning of the power supply and protection system was prolonged.
Acceleration and slow extraction of the deuteron beam was provided up to an energy of about
3 GeV/u. The accelerator worked for the physical research program during about 300 hours.
The results of the machine development shifts are presented in this article.
|
E15-2011-73 (1.002.106)
Bystritsky V.M. et al.
Investigation of Temperature Dependence of Neutron Yield and Electron
Screening Potential for the d(d,n)3He Reaction Proceeding in
Deuterides ZrD2 and TiD2
The temperature dependence of the enhancement factor for the dd reaction
proceeding in TiD2 and ZrD2 is investigated. The
experiments were carried out at the Hall pulsed ion accelerator (INP,
Polytechnical University, Tomsk, Russia) in the deuteron energy interval 7.0 12.0 keV and at
temperatures ranging from 20 to 200 oC. The values
obtained for the electron screening potentials indicate that the dd-reaction
enhancement factor does not depend on the target temperature in the range
of 20 200 oC. This result contradicts the conclusions drawn by the
LUNA Collaboration from their work.
|
E5-2011-74 (658.878)
Gevorkyan A.S., Abajyan H.G.
A New Parallel Algorithm for Simulation of Spin Glasses on Scales
of Space-Time Periods of External Fields with Consideration of Relaxation Effects
We have investigated the statistical properties of an ensemble
of disordered 1D spatial spin chains (SSCs) of finite length, placed in an external field,
with consideration of relaxation effects. The short-range interaction complex-classical Hamiltonian
was first used for solving this problem. A system of recurrent equations is obtained on the nodes of
the spin-chain lattice. An efficient mathematical algorithm is developed on the basis of these equations
with consideration of the advanced Sylvester conditions which allows one step by step to construct a huge
number of stable spin chains in parallel. The distribution functions of different parameters of spin-glass
system are constructed from the first principles of the complex classical mechanics by analyzing the
calculation results of the 1D SSCs ensemble. It is shown that the behavior of the parameter distributions
is quite different depending on external fields. The energy ensembles and constants of spin-spin interactions
are changed smoothly depending on the external field in the limit of statistical equilibrium, while some of
them such as the mean value of polarizations of ensemble and parameters of its orderings are frustrated.
We have also studied some critical properties of the ensemble of such catastrophes in the Clausius-Mossotti
equation depending on value of the external field. We have shown that the generalized complex-classical
approach excludes these catastrophes allowing one to organize continuous parallel computing on the whole
region of values of the external field including critical points. A new representation of the partition function
based on these investigations is suggested. As opposed to usual definition, this function is a complex one
and its derivatives are everywhere defined, including critical points.
|
E14-2011-75 (667.036)
Anghel L.V. et al.
Stability of Tris-1,10-Phenantroline Iron (II) Complex in Biomineral
Particles Produced by Klebsiella oxytoca
The composition of composites has a huge impact on the stability of
tris-1,10-phenantroline iron (II) complex during the determination of total
iron content. The subject of this work is the determination of the stability
of tris-1,10-phenantroline iron (II) complex in samples of biominerals
produced by bacteria Klebsiella oxytoca. The stability of this complex was monitored in the
time period of 0-60 min. The aim of this work is to determine the
concentration of the biogenic ferrihydrite in the samples and the time
interval in which the absorbance of the complex is highest. The UV-Vis
spectrophotometric method was used for the determination. Obtained results
indicate that for more exact estimations of the concentration of biogenic
ferrihydrite, absorbance of tris-1,10-phenantroline iron (II) complex should
be measured within 25 min from the moment ortho-phenantroline was
added.
|
2-2011-76
Êàëèíîâñêèé Þ. Ë.
Ýôôåêòèâíàÿ ÊÕÄ ïðè êîíå÷íîé òåìïåðàòóðå è ïëîòíîñòè
Àâòîðåô. äèñ. ... äîêòîðà ôèç.-ìàò. íàóê
(rus)
|
P13-2011-79 (1.106.405)
Turek M. et al.
Designs of the Plasma Ion Source for Solid Bodies
Three different designs of the plasma ion source, with a hallow
cathode and anode-evaporator system at the rear part of the source (TA), with a
cylinder anode (CA), and with a hallow cathode and anode at the front part of the
source (PA), are described.
The experimental results, such as dependence of the ion current on the discharge current, cathode
current and induction of the electromagnetic field generated by the electromagnet of the ion source, are presented.
|
E16-2011-80 (882.158)
Kuban  k J.,
Molokanov A.G., Vlek B.
Out-of-Field Dosimetry of the JINR Radiotherapeutic Proton Beam Using
Thermoluminescent Detectors
We describe results of experiments performed at the clinical
proton beam of the Laboratory of Nuclear Problems of JINR (Dubna, Russia). The
experiments were focused on determination of the out-of-field doses in the
near vicinity of the irradiated target volume and estimation of the linear
energy transfer (LET) distributions. Measurements were performed using
several types of thermoluminescent detectors (TLD) placed in the
polymethylmethacrylate phantom. The average value of the LET was estimated
using knowledge of the relative response of the TLD to the radiation with
different LET. It was found that the relative out-of-field dose values
decline up to 0.01% of the dose delivered to target and that the average
value of the LET in the vicinity of the target does not exceed 6 keV/ m.
Further we revealed scatter of the radiation in the collimation system
causing the nonsymmetry of out-of-field distribution. Fortunately, we found
out that it does not pose a hazard for the patient.
|
P9-2011-82 (199.932)
Dolya S.N., Reshetnikova K.A.
Linear Accelerator of C+6 Ions as Injector for a Synchrotron Intended for Hadron Therapy
We consider acceleration of Ñ+6 ions by the field of a
traveling wave in a helical waveguide. The frequency of the accelerating RF field
f0 MHz, generator power P0 = 2 MW. The initial energy of ions
Ein = 50 keV/nucleon, final energy Efin = 5 MeV/nucleon, accelerator length
Lacc = 10 m. A spiral with the initial and final radii of winding
r0 in = 2 cm and r0 fin = 1 cm is placed in a screen of
diameter 2R = 100 mm. Ion focusing is provided by a solenoidal magnetic field
with the intensity B0 = 3.5 T. With increasing the accelerator length up to
L = 15m, the final energy of the ions can be increased up to a value of Efin = 7
MeV/nucleon.
|
E9-2011-84 (2.970.063)
Bing Wang et al.
Computer Design of a Compact Cyclotron
Here we present results of the computer design of the structural elements of
a compact cyclotron by the example of HITFiL cyclotron selected as the
driving accelerator that is under construction at the Institute of Modern
Physics (Lanzhou, China). In the article a complex approach to modeling of
the compact cyclotron, including calculation of electromagnetic fields of
the structural elements and beam dynamics calculations, is described. The
existing design data on the axial injection, magnetic, acceleration and
extraction systems of the cyclotron are used as a starting point in the
simulation. Some of the upgrades of the cyclotron structural elements were
proposed, which led to substantial improvement of the beam quality and
transmission.
|
E14-2011-85 (348.696)
Skora I. et al.
Variations of 137Cs and 40K in the
Surface Air of Bratislava (Slovakia) - Indications of Soil Resuspension Processes
Sources and variations of 137Cs and 40K in the ground-level air of
Bratislava are presented and discussed. The 137Cs activity
concentration in the surface air between 1977 and 2007 was decreasing with
an ecological half-life of 3.4 years (high values observed during 1986 and
1987 due to the Chernobyl accident were excluded from the evaluation).
However, during 2007-2010 the yearly averaged 137Cs activity
concentrations were almost constant. The increased atmospheric 137Cs
and 40K levels observed during winter may be due to surface soil
resuspension and radionuclide transport by winds, particularly from open
agricultural areas (also confirmed by high correlation coefficient between
the 137Cs and 40K atmospheric concentrations, R = 0.84). The
137Cs/40K activity ratio for the surface air (0.07) is closer to
the mean value observed in soil (0.05) than to the mean value observed in
tree leaves (0.01), which would also indicate a predominant influence of soil
resuspension processes on the atmospheric concentrations of these
radionuclides during winter.
|
P14-2011-87 (800.795)
Didyk A.Yu.
Anomalously Deep Penetration of Hydrogen and Deuterium in a Sandwich
of Two Niobium Foils and Deuterium Polyethylene (CD2)n
under Action of Pulse High Temperature Hydrogen Plasma
The studies of storage and redistribution processes of hydrogen atoms under
the influence of pulse high temperature hydrogen plasma obtained using the
«Plasma Focus» PF-4 set-up in multilayered structure
(sandwich) consisting
of two high purity niobium foils and deuterium
polyethylene film pressed between them have been carried out by the method of elastic recoil
detection (ERD). It was established that with an increased number of PF-4
set-up pulses there occurs spreading and transfer of implanted hydrogen
atoms to large depths in two Nb-foils which are significantly larger than
the projected range of hydrogen ions (with the velocity ~ 108 ñm/s).
The maximum hydrogen concentration up to 45 at. % is reached in
the nearest to PF-4 surface of the second Nb-foil at 20 impulses of the PF-4
set-up.
Roentgen studies allowed us to establish the presence of niobium
hydride phase
in both Nb-foils. It was observed that the redistribution
and spreading of
deuterium atoms from the bound state in deuterium polyethylene near the surface layer and bulk material
of the second Nb-foil took place, too.
The observed phenomenon can be described by transfer of implanted
hydrogen atoms under the action of powerful shock waves, created by pulse
hydrogen plasma and by accelerating hydrogen atom diffusion under
the influence of compression-straining wave at the front of the shock wave
and redistribution of hydrogen and deuterium atoms at large depths.
|
P14-2011-88 (484.612)
Didyk A.Yu.
Anomalously Deep Penetration of Hydrogen into Niobium under Action
of Pulse High Temperature Hydrogen Plasma
The method of elastic recoil detection (ERD) has been used for the study of
storage and redistribution processes of hydrogen atoms under the influence
of pulse high temperature hydrogen plasma obtained using the «Plasma Focus»
PF-4 set-up in three high purity niobium foils. It was established
that with an increase of number of PF-4 set-up pulses there occur spreading and
transfer of implanted hydrogen atoms to large depths in three Nb-foils which
are significantly larger than the projected range of hydrogen ions (with the
velocity ~ 108 ñm/s). The maximum hydrogen concentration up to 60 at.%
is reached in the nearest to PF-4 surface of the third Nb-foil at 20 impulses of the PF-4 set-up.
The observed phenomenon can be described by transfer of implanted
hydrogen atoms under the action of powerful shock waves, created by pulse
hydrogen plasma and (or) by accelerating hydrogen atom diffusion under
the influence of compression-straining wave at the front of the shock wave
at redistribution of hydrogen atoms at large depths. Similar behavior was
discovered and described also in series of nickel, vanadium, niobium and
tantalum foils (two or three foils and more in a series) including series of
foils from heterogeneous (different) materials, which were studied, too.
|
E4-2011-91 (180.782)
Kuz'min V.A., Tetereva T.V.
Influence of Monopole Pairing Potential on the Energies of the Single-Nucleon States in the
Problem of the Pairing Correlations of Superconductive Type
The correlation function, chemical potential,
coefficients of Bogoliubov's special transformation
and one-quasiparticle energies have been calculated
with taking into account the influence of monopole
pairing on the energy of single-particle states
in nuclear mean field.
|
P11-2011-93 (743.973)
Filozova I.A. et al.
User Guide to JINR Server of Scientific Publications JDS
In the framework of the international program OAI
(Open Access Initiative) the digital open access archive-repository JINR Document
Server (JDS) is built up. The main goal of the JDS is to collect at the JINR site all
the publications of JINR researchers. The documents deposited in the repository are
preprints, journal articles, books, conference papers, conference announcements,
theses, annual reports, etc. Currently, the retrospective publications of JINR authors
up to 1956 are deposited. The JDS, being an integrated digital library system, gives
users an opportunity to deposit manuscripts in self-archiving mode, create personal
catalogs, subscribe to alerts and RSS, send comments and arrange discussions on submitted papers.
|
E10-2011-94 (201.012)
Bogdanova N., Todorov S.
Orthonormal Polynomial Approximation of Water Drop Evaporation Data with Errors in Two Variables
The investigation for fitting drop water evaporation data as
a result of original microscope observations is presented. Our approximation algorithm
with construction of orthonormal polynomials (orthonormal polynomial
expansion method, OPEM) is applied to data with uncertainties in both
independent and dependent variables. For this purpose our numerical method
is developed here to include both errors. We also review its principles
and analyze the orthonormal and «usual» expansions of the approximating
function.
|
E9-2011-95 (592.850)
Zhabitsky V.M.
Beam Stability in Synchrotrons with Digital Transverse Feedback
Systems in Dependence on Beam Tunes
The beam stability problem in synchrotrons with a digital transverse feedback
system (TFS) is studied.
The TFS damper kicker (DK) corrects the transverse momentum of a bunch in proportion to its displacement
from the closed orbit measured at the location of the beam position monitor (BPM).
It is shown that the area and configuration of the beam stability separatrix depend on the beam tune,
the feedback gain, the phase balance between the phase advance from BPM to DK and the phase response
of the feedback chain at the betatron frequency.
|
P11-2011-96 (3.439.531)
Shvetsov V.N. et al.
8-Channel System for Neutron-Nuclear Investigations by Time-of-Flight Method
In connection with commissioning of the IREN pulsed resonance neutron source,
new electronics and appropriate software are developed for registration of
time-of-flight spectra with small width of the channel (10 ns). The
hardware-software system is intended for research of the IREN neutron beam
characteristics, properties of new detectors, and also for performance of
precision experiments under conditions of low intensity or registration of
rare events.
The time encoder is the key element of the system hardware. It is developed
on the basis of the Cypress-technologies. The unit can measure time
intervals for signals intensity up to 105 for each of eight inputs.
Using a USB interface provides system mobility.
The TOF System Software includes the control program, driver software layer,
data sorting program and data processing utilities and other units,
performed as executable applications. The interprocess communication between
units is provided by network and/or by specially designed interface based on
the mechanism of named files mapped into memory. This method provides
fastest possible communication between processes.
The developed methods of integrating the executable components into a system
provide a distributed system, improve the reusing of the software and
provide the ability to assemble the system by the user.
|
E11-2011-97 (249.197)
Kupenova T.N.
An Inductive Algorithm for Smooth Approximation of Functions
An inductive algorithm is presented for smooth approximation of
functions, based on the Tikhonov regularization method and applied to a specific kind
of the Tikhonov parametric functional. The discrepancy principle is used for estimation
of the regularization parameter. The principle of heuristic self-organization is applied
for assessment of some parameters of the approximating function.
|
P18-2011-98 (5.529.672)
Eganova I.A. et al.
Dubna–Nauchny–Novosibirsk Geophysical Monitoring: The Sun Factor
Observed in the Siberian point of the Dubna–Nauchny–Novosibirsk monitoring,
the phenomenon of the controlled open geological system mass decrease, which is due to the Sun,
is considered. Mass phase trajectory is discussed, and it is shown that the observed annual dynamics
of some mineral (mineral aggregate) mass is conditioned by this phenomenon, and minute mass dynamics
contains a definite functional dependence, too — the so-called embedding dimension is equal to four.
Possible range of application of this phenomenon is given in the conclusion, and in the appendix,
which is of separate interest, physical meaning of the rescaled range introduced by H. E. Hurst is
revealed and some practical way for temporal structures confrontation is proposed.
|
P10-2011-101 (1.867.843)
Kirilov A.S.
Current State and Prospects of the IBR-2M Instrument Control Software
The article is devoted to the main features and plans of future improvements
of the Sonix+ instrumental complex, which is used now to control
experimental hardware at the IBR-2M spectrometers.
The Sonix+ software inherited basic solutions from the older Sonix system.
In particular, those are the modular organization using special database for
device control and reflection of the current system state, using script
programming for the measurement procedure.
At the same time, some basic features were revised to make the system more
unified, flexible and comfortable for the user.
Main changes can be grouped as follows: structural enhancements, using the
Python as a script language, GUI redesign and unification, remote
supervision and instrument control via network.
During the last years, this complex has been tested at some IBR-2
instruments (REMUR, NERA-PR) and on some instruments at other centers. We
are planning to install it at the other instruments of IBR-2M as well.
|
P11-2011-104 (687.013)
Amirkhanov I.V. et al.
Analytical and Computational Investigations of Solutions
of Boundary-Value Problems for the Quasipotential Equation
Investigation of solutions of a boundary-value 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
Schr dinger equation is performed.
|
E15-2011-105 (214.751)
Karamian S.A., Carroll J.J.
Calculated Yield of Isomer Depletion due to NEEC for 93mMo Recoils
Possibilities for nuclear isomer depletion due to atomic-nuclear cooperative
processes such as NEET and NEEC with application of storage rings and
electromagnetic traps are of interest in modern literature. Recently, a
newer scheme requesting only standard techniques for isomer production in
nuclear reactions combined with stopping of recoils in gas has been
proposed. The isomer sample and the producer reaction must be chosen
specially to meet the requirements for NEEC resonance in transmutation of
the isomer to ground state via definite intermediate level. At the present
work, quantitative calculations were carried out for production and
depletion of the 93mMo isomer at relatively simple experiment using 91Zr ions.
Such studies could be arranged at already existing and
operating accelerators, for instance, in GSI, or in Dubna. The 93mMo
nuclei produced in He-gas target due to the 4He(91Zr, 2n) reaction
continue to move in gas with high velocity being then depleted due to NEEC
in highly-ionized species.
|
E4-2011-107 (522.733)
Severyukhin A.P., Voronov V.V., Nguyen Van Giai
Spin-Isospin Excitations in Nuclei and a Separable Approximation for Skyrme Interactions
A finite rank separable approximation of Skyrme forces is applied
to study charge-exchange excitations in spherical nuclei. This
approximation enables one to reduce considerably the dimensions of
the matrices that must be diagonalized to perform QRPA
calculations in large configuration spaces. Choosing as examples
the nuclei 90Zr, 132Sn and 126,128,130Cd, we
demonstrate an ability of the method to study the Gamow-Teller and
spin-dipole strength distributions. It is shown that
characteristics calculated within the approach are in a reasonable
agreement with available experimental data.
|
P10-2011-108 (2.171.341)
Afanasiev O.A. et al.
A Software Complex for Mapping and Research of Proteins and Nucleic Acids
A software complex with a suitable graphic interface has been designed for
cartography and studies of the surface of globular proteins, helix chains of proteins, DNA,
and RNA on the basis of PDB files within the Windows environment. For the proteins it is possible to
devise maps with a functional atom and relief coloration in Aitov-Hammer projection (SURFACE-2008 program)
or else in an original cylinder projection (PROT-Z program). The helix-DNA program provides maps of the surfaces
of the DNA/RNA spiral molecules as an orthogonal projection of a 3D structure onto the plane perpendicular to the
long axis of the DNA helix. This software complex includes a modified program SURFACE developed earlier in the OS
DOS environment for mapping the surfaces of globular proteins in the Aitov-Hammer projection. The complex comprises
the compact versions of the mentioned computer programs, namely SURFACE-compact, PROT-Zcompact and helix-DNA-Zcompact
programs. The graphic interface has been excluded from these versions of programs as these are used only to organize
a mass calculation of the maps in a distributed computing environment. Thus, one can reach significant savings of
both computing resources and computing time when studying single-type data structures. In order to obtain graphic
images of the maps, one should use the full versions of corresponding programs. To manage jobs within the distributed
computing environment, a specialized monitoring program NetdBBio working in OS Windows has been created.
|
P10-2011-109 (94.408)
Grokhlina T.I. et al.
ANTPC - a Database of Amino Acid-Nucleotide Contacts in the Protein-DNA Complexes
The analysis of amino acid-nucleotide contacts in interfaces of the protein-DNA complexes,
intended to find consistencies of the protein-DNA recognition, is a complex problem that requires an analysis
of the physico-chemical 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 the DNA-protein interfaces.
|
P6-2011-112 (299.824)
Aksenov N.V. et al.
Production of 178m2Hf by Irradiation of 176Yb with Accelerated
4He Ions
We studied a possibility of accumulation of 178m2Hf isomer by
irradiation of 176Yb with accelerated 4He ions at internal beam of
the U-200 cyclotron in Dubna. The He+ ions reach an energy of 35 MeV
with a beam intensity of 15 A. An efficient radiochemical separation
method based on anion exchange chromatography has been developed to isolate
and concentrate Hf isotopes from the ytterbium irradiated target. Under
described conditions 3.17 1014 atoms of 178m2Hf were
produced. The possibilities of using the described method for production of
the 178m2Hf isomeric material via 176Yb(4He,2n) reaction with
increased beam current are briefly discussed.
|
P2-2011-116 (416.837)
Dedovich T.G., Tokarev M.V.
Method of Systems of the Equations of P-adic Coverages for Fractal Analysis of Events
Self-similarity in multiple processes at high energies is discussed.
A parton shower is assumed to transform into
a hadron shower with a fractal structure.
It is noted that the BC (Box Counting) and PaC
(P-adic Coverage) methods allow one to determine
the dimension of fractals with permissible 1/k parts.
New method (method of Systems of the equations of P-adic Coverages)
that is applicable for analysis of N-ary cascades with permissible
m/k parts is offered.
This method (SePaC method) allows us to determine the fractal
dimension of the shower with the given accuracy,
the number of fractal levels and of partons at
branching in the process of development of the shower,
the cascade type (random or regular) and its structure.
|
P9-2011-117 (420.484)
Isaev A.V. et al.
Calculation of Neutron and Gamma-Quanta Yields from the DC-110 Cyclotron
At present the DC-110 cyclotron is being designed at the FLNR for the needs
of the technology-innovative zone in Dubna. Within the framework of the
project different «incident ion-target nucleus» combinations were
analyzed over a wide range of ion energies for the dosimetric control
purposes. In this paper neutron and -ray yields produced by the
DC-110 ion accelerator as well as various nuclide cross-sections are
presented.
|
P13-2011-120 (358.140)
Sobolev Yu.G., Ivanov M.P., Penionzhkevich Yu.E.
Set-up for Measuring Total Cross Sections in Nuclear Reactions
Experimental method and set-up for measurements of energy dependence of total cross
sections in nuclear reactions are described. The modified transmission method,
registration of quanta in 4 geometry and pulse-shape discrimination with semiconductor detector are used.
charged-particle identification by pulse-shape analysis in semiconductor detector are used.
|
P4-2011-123 (1.064.453)
Pupyshev V.V.
Proton-Hydrogen Atom Scattering in Effective Two-Body Model
By assumption, the total proton-hydrogen atom interaction is
the sum of the short-range nuclear Reid potential with a soft core
and the long-range Thomas-Fermi potential. The quantum-mechanic
analysis of the low-energy peculiarities of the phase-shift and
cross-section of the proton-hydrogen atom scattering is given in the
case of zero total angular momentum. As the result of the
calculation performed in the framework of the nonlinear version to
the variable phase approach, it is shown that due to the long-range
asymptotics of the Thomas-Fermi potential, the cross-section
oscillates at low energies but has a finite number of zeros.
|
P13-2011-124 (349.331)
Batusov V.Yu., Budagov J.A., Lyablin M.V.
Laser Sensor of the Earth Surface Seismic Vibration Angular Component
A principally new method to measure the seismic tilt angle is proposed. The
method opens up the possibility of on-line stabilization of the laser ray
extended coordinate axis in the metrology support of large scale physics
equipment high precision assembly. The method has been approved
experimentally: for the first time the low frequency periodic angular
oscillation of the earth surface has been registered with 5 10-7 rad
amplitude and 2.5 10-8 rad registration noise. The measurements were
performed at CERN during the assembly of the ATLAS Spectrometer.
|
E10-2011-126 (426.520)
Alexandrov E.I. et al.
HEPWEB - WEB-Portal for Monte Carlo Simulations in High-Energy Physics
A WEB-portal HepWeb allows users to perform the most popular calculations in
high-energy physics - calculations of hadron-hadron, hadron-nucleus, and nucleus-nucleus
interaction cross sections as well as calculations of secondary-particle characteristics in
the interactions using Monte Carlo event generators. The list of the generators includes
Dubna version of the intranuclear cascade model (CASCADE), FRITIOF model, ultrarelativistic
quantum molecular dynamics model (UrQMD), HIJING model, and AMPT model.
Setting up the colliding particles/nucleus properties (collision energy, mass numbers and
charges of nuclei, impact parameters of interactions, and number of generated events)
is realized by a WEB-interface. A query is processed by a server, and results are
presented to the user as a WEB-page.
Short descriptions of the installed generators, the WEB-interface implementation
and the server operation are given.
|
P13-2011-127 (3.684.825)
Golubeva M.B. et al.
Nucleus-Nucleus Collision Centrality Determination by the Spectators
Calorimeter for the MPD Setup at the NICA Facility
The work conditions of the hadron calorimeter for spectators registration (Zero
Degree Calorimeter, ZDC) were studied for the heavy nuclei collisions
with the several GeV invariant energy.
The ZDC simulations were performed for the MPD
(Multi-Purpose Detector) at the
NICA (Nuclotron-based Ion Collider fAcility) collider,
which are under development at the Joint Institute for Nuclear Research
(JINR, Dubna). Taking into account
the spectator nuclear fragments
leads to a nonmonotonic dependence of the ZDC response
on the impact parameter. The reason for this dependence studied
with several event generators is
the primary beam hole in the ZDC center. It is shown that
the ZDC signal should be combined with data from other MPD@NICA detector
subsystems to determine centrality.
|
P4-2011-129 (464.931)
Pupyshev V.V.
Proton-Hydrogen Reaction in Effective Two-Body Model
In the suggested model the total interaction of proton and
hydrogen atom is assumed to be the sum of the short-range nuclear
Reid potential and the long-range Thomas-Fermi potential caused by
the Coulomb interactions of electron with hydrogen nucleus. As is
shown, in this model the cross-section of the proton-hydrogen
reaction with generation of the deuteron increases as inverse power
of the collision energy in its zero limit.
|
P10-2011-132 (822.205)
Borisovsky V.F., Zaikina T.N., Musulmanbekov G.
Indico: Conference Storage and Management System
The manual introduces the multi-platform system Indico which allows one to
create the conference portal and perform the management of the entire
conference lifecycle up to the publishing of conference proceedings. The
basic features of the system for both the organizers and participants are
described.
|
P13-2011-135 (313.614)
Krasnov V.A. et al.
Multilayer Scintillation Charge Pions Spectrometer
The design and characteristics of the 14-layer scintillation spectrometer
for the charged mesons registration are given. The results of the
spectrometer testing using a space radiation and beam particles are given at
energies up to 1 GeV. The spectrometer is constructed on the flat
scintillation plates glued with light irradiating optical fibers.
|
2011-134 (42.073.247)
Brief Review of Topmost Scientific Results Obtained in 2011 at the Joint Institute for Nuclear Research
|
