| 2013 |
|
E13-2013-1 (316.063)
Voskoboinik E.I. et al.
High-Resolution Magnetic Analyzer MAVR
A project of the high-resolution magnetic analyzer MAVR is proposed.
The analyzer will comprise new ion-optical and detecting systems for separation and identification
of reaction products in a wide range of masses (5-150) and charges (1-60).
The MULTI detecting system is being developed for the MAVR magnetic analyzer to allow detection
of nuclear reaction products and their identification by charge Q, atomic number Z, and mass A with
a high absolute accuracy. The identification will be performed by measuring the energy loss
( E),
time of flight (TOF), and total kinetic energy (TKE) of reaction products. The particle trajectories in the
analyzer will also be determined using the drift chamber developed jointly with GANIL (France).
The MAVR analyzer will operate in both primary beams of heavy ions and beams of radioactive nuclei produced
by the U400-U400M acceleration complex. It will be also used for measuring energy spectra of nuclear reaction
products and as an energy monochromator.
|
E15-2013-2 (205.076)
Testov D. et al.
First Delayed Neutron Emission Measurements at ALTO with the Neutron Detector TETRA
Beta-decay properties are among the easiest and, therefore, the first ones to be measured
to study new
neutron-rich isotopes. Eventually, a very small number of nuclei could be sufficient to estimate their
lifetime and neutron emission probability. With the new radioactive beam facilities which have
been commissioned recently (or will be constructed shortly) new areas of neutron-rich isotopes will become
reachable. To study beta-decay properties of such nuclei at IPN (Orsay) in the framework of collaboration with
JINR (Dubna), a new experimental setup including the neutron detector of high efficiency TETRA was developed
and commissioned.
|
P13-2013-3 (303.802)
Pepelyshev Yu.N., Rogov A.D.
Neutron-Physical Calculations at the IBR-2M Reactor
during Physical and Energetic Reactor Startup
The paper presents key results of neutron-physical calculations at the
IBR-2M reactor necessary for physical and energetic reactor startup. A
special focus was given to measurements of reactor condition and nuclear
safety during the critical mass and critical level stages as well as
assessment of the effectiveness of reactor control rods and reactivity
modulator. Calculated assessment of reactor condition while achieving the
nominal plate capacity was particularly important. The paper also provides a
comparison of calculated versus experimentally measured data.
|
P13-2013-4 (229.902)
Pepelyshev Yu.N., Rogov A.D.
Power Startup of the IBR-2M Reactor. Fast Power Reactivity Feedback Parameters
The paper presents the study results on the fast power coefficients of
feedback reactivity at the modernized IBR-2 (IBR-2M) reactor. The study was
conducted based on the 2011 power reactor startup program at up to
140 MW  day power production.
The paper illustrates that the reactivity coefficient of fast power
reactivity feedback is negative at all levels of capacity and sodium flow
rate throughout the active zone. At 2 MW capacity and sodium flow rate of
80-100 m3/h the power feedback coefficient is -0.043  0.0066,
10-2  ýô/kW.
At 0.5 to 2 MW capacity the fuel and sodium parts of the power feedback
coefficient were separated. It was shown that the sodium part of the power
feedback coefficient at nominal capacity of 2 MW is negligible. The fuel part
of the power feedback coefficient is constant at all levels of power and
equal to 0.047 0.0066, 10-2 ýô/kW.
Changes in power feedback coefficient from sodium heating in the active
power zone can be characterized as threshold. Above the threshold
temperature level of 40  , the power feedback coefficient decreases sharply
(1.7 times). Power feedback coefficient is sufficient for consistent reactor
performance at capacity of up to nominal of 2 MW.
|
P11-2013-5 (197.712)
Dedovich T.G., Tokarev M.V.
Comparison of Fractal Analysis Methods in the Study of Fractals with Independent Branching
Dimension as a quantitative characteristic of a space geometry is discussed.
Hadrons produced in collisions of particles and nuclei are assumed to be sample of points in 3D-space
(pT,  ,
 ) having properties of a fractal. Hausdorff-Besicovitch dimension
is regarded as the
most natural quantity to determine the fractal dimension DF. Results of comparison
of the various methods
as Box Counting (BC), P-adic Coverage (PaC), System of Equation of P-adic Coverage (SePaC), to determine a
fractal dimension are presented. The procedure to determine the optimal values of the parameters of these
methods is described. It allows us to find the fractal dimension, number of fractal levels, and fractal
structure with maximal efficiency. Features of PaC and SePaC methods for analysis of fractals with independnet
branching are noted.
|
P13-2013-6 (365.278)
Pepelyshev Yu.N., Rogov A.D.
Power Startup of the IBR-2M Reactor. Sodium Flow Rate Reactivity Feedback Parameters
The paper presents the study results on the sodium flow rate of feedback
reactivity of the IBR-2M reactor. The study was
conducted based on the 2011 energetic reactor startup program at up to
nominal of 2 MW. All fast and asymptotic feedback effects are negative at all
power levels and flow rates of sodium through the active zone. The specified
parameters of the reactor allow its safe and effective
functioning at a power up to 2 MW with a frequency of repetition of impulses
5 s-1.
|
P13-2013-7 (234.820)
Pepelyshev Yu.N., Rogov A.D.
Slow Power Reactivity Feedback Parameters of the IBR-2M Reactor
The paper presents the results of study on the slow power coefficients of feedback
reactivity of the modernized IBR-2 (IBR-2M) reactor. The study was conducted based on the 2011 energy
reactor startup program at up to 140 MW day power production.
It is shown that slow power
feedback of IBR-2M contains two components, negative
(-27 10-2 eff)
and positive
(+35 10-2 eff),
with constants of exponential change equal to -110 and +1.8 h,
respectively. In comparison with IBR-2, the positive component of feedback decreased by 40%,
and negative one by 10%. The time constants changed slightly (~ 10%). The main components
of slow feedback in the reactor can be caused by the changes occurring in various elements surrounding
the active zone, for example, in stationary reflectors, biological protection, etc. The system of automatic
power control of the IBR-2M reactor by existing parameters of slow power feedback reliably provides power
stabilization at the set level.
|
P13-2013-9 (267.441)
Pepyolyshev Yu.N., Popov A.K.
Estimation of Power Feedback Parameters of Pulse Reactor IBR-2M on Transients
Parameters of the IBR-2M reactor power feedback (PFB) on a model of the
reactor dynamics by mathematical treatment of two registered transients are
estimated. Frequency characteristics and the pulse transient characteristics
corresponding to these PFB parameters are calculated. PFB parameters
received thus can be considered as their express tentative estimation
as real measurements in this case occupy no more than 30 minutes.
Total PFB is negative at 1 and 2 MW. At the received estimations of PFB
parameters in a self-regulation mode it is possible to consider the
stability margins of the IBR-2M reactor satisfactory.
|
P9-2013-10 (1.105.309)
Zamriy V.N., Sumbaev A.P.
Precision Thermostabilization for LUE-200 Accelerator Section
A two-loop thermostating system for the accelerating section of the S-band electron linac has been developed. To provide the required heatsink path and an opportunity
of re-changing the section while altering the acceleration mode, the temperature in the system of the thermostat and the cooling water channel in the external contour are regulated.
To achieve the required precision (0.1%) and stabilization time of the temperature of the thermostat having extended waterways, the method of proportional-integral-derivative (PID)
control has been applied. The programmed control allows one to adapt the system for several operating modes: the fast warming-up, operated settling of temperature and thermostabilization,
change of the preset temperature of the thermostat. It provides the reduction of errors and setting time of the thermostating regime, and also minimization of power consumption of the thermostat.
|
P2-2013-11 (1.986.044)
Kazakov D.I.
The First Lessons of the LHC: The Higgs Boson and Supersymmetry
We discuss recent results on the Higgs boson discovery and search for
supersymmetry at the LHC. Is the Higgs boson really discovered and if yes is
it the Higgs boson of the Standard Model? Which properties of the discovered
particle are consistent with the SM and what are the alternatives? Could it
be that two Higgs bosons are discovered? What one can say about the
stability of the electroweak vacuum if the Higgs boson has a mass of 125 GeV? What are the predictions of SUSY theories concerning the Higgs boson
mass? Does the value of 125 GeV support SUSY or contradict it? What is the
situation with SUSY searches and what is left of SUSY parameter space? Is
low energy SUSY still alive? What are the perspectives of SUSY finding at
the LHC at 14 TeV?
|
2013-12 (1.680.534)
Brief Review of Topmost Scientific Results Obtained in 2012 at the Joint Institute for Nuclear Research
|
P1-2013-13 (598.993)
Piyadin S.M.
The Study of the dp  ppn
Reaction at the Internal Target Station at Nuclotron at Deuteron Energy of 500 MeV
The results of data processing for the study of the deutron breakup reaction
at energy of 500 MeV are presented. The set-up at the Internal Target Station at Nuclotron is
described, the algorithm of the useful events selection for the deuteron breakup reaction with
the registration of two protons is demonstrated.
|
E2-2013-14 (242.449)
Kobushkin A.P., Strokovsky E.A.
Spin-Dependent Observables and the D2 Parameter
in Breakup of Deuteron and 3He
We analyze the momentum
distributions of constituents in 3He, as well as the spin-dependent
observables for (3He, d), (3He, p), and (d, p)
breakup reactions. Special attention is paid to the region of small relative momenta
of the helium-3 and deuteron constituents, where a single parameter, D2,
has determining role for the spin-dependent observables. We extract also this
parameter for the deuteron, basing on the existing data for the tensor analyzing
power of this (d, p) breakup.
|
P15-2013-15 (4.736.383)
Didyk A.Yu., Wi niewski R., Wilczynska-Kitowska T.
Changes of Surface Structure and Elemental Composition of Pd Rod
and Collector of Nuclear and Chemical Reaction Products,
Irradiated with 10-MeV  Quanta in Dense Deuterium Gas
A high-pressure chamber was filled with 1.2 kbar molecular deuterium (DHPC).
The palladium rod saturated by deuterium was loaded inside the DHPC and irradiated with 10-MeV
bremsstrahlung quanta during 18 h at 11-13  A electron beam using
the MT-25 electron
accelerator. The elemental compositions of all DHPC element surfaces which were inside dense deuterium gas were
studied using scanning electronic microscopes with X-ray microprobe analysis. It was established that all surfaces
including the surface of a high-purity palladium rod (99.995%) were covered by partly homogeneous layer or large
microparticles of lead. Also, such light elements as 6C, 8O, 11Na, 12Mg, 13Al,
14Si, 22Ti, 25Mn,
26Fe, 29Cu, 30Zn and heavy metals 47Ag, 73Ta,
74W, 78Pt, 79Au and 82Pb were observed. The possible processes which
can cause the observed anomalies in the composition of new created chemical elements are discussed shortly.
|
7-2013-16 (2.728.145)
Ñâèðèõèí À. È.
Ýêñïåðèìåíòû ïî èçó÷åíèþ ìíîæåñòâåííîñòè íåéòðîíîâ ñïîíòàííîãî äåëåíèÿ êîðîòêîæèâóùèõ ÿäåð, ñèíòåçèðóåìûõ â ðåàêöèÿõ ïîëíîãî ñëèÿíèÿ ñ òÿæåëûìè èîíàìè
Àâòîðåô. äèñ. ... êàíä. ôèç.-ìàò. íàóê
(rus)
|
E19-2013-17 (6.851.243)
Kholmurodov Kh.T. et al.
Molecular Dynamics Simulations of the DNA Interaction
with Metallic Nanoparticles and TiO2 Surfaces
The understanding of the mechanism of DNA interactions and binding with metallic
nanoparticles (NPs) and surfaces represents a great interest in today's medicine applications due
to diagnostic and treatment of oncology diseases. Recent experimental and simulation studies involve the
DNA interaction with highly localized proton beams or metallic NPs (such as Ag, Au, etc.), aimed at targeted
cancer therapy through the injection of metal micro- or nanoparticles into the tumor tissue with consequent
local microwave or laser heating. The effects of mutational structure changes in~DNA and protein structures
could result in destroying of native chemical (hydrogen) bonds or, on the contrary, creating of new bonds that
do not normally exist there. The cause of such changes might be the alteration of one or several nucleotides
(in DNA) or the substitution of specific amino acid residues (in proteins) that can lead to the essential
structural destabilization or unfolding. At the atomic or molecular level, the replacement of one nucleotide
by another (in DNA double helices) or replacement of one amino acid residue by another (in proteins) cause
essential modifications of the molecular force fields of the environment that break locally important hydrogen
bonds underlying the structural stability of the biological molecules. In this work, the molecular dynamics(MD)
simulations were performed for four DNA models and the flexibilities of the purine and pyrimidine nucleotides
during the interaction process with the metallic NPs and TiO2 surface were clarified.
|
E17-2013-18 (1.178.908)
Dushanov E.B. et al.
A Comparative MD Analysis of the Structural and Diffusion Properties of Formamide/Water
and Ethanol/Water Mixtures on TiO2 and Pt Surfaces
Formamide-surface interaction was one of the main discussion topics at the round table
meeting of the conference Italia-Russia@Dubna «Astrobiology: New Ideas and Research Trends» (2011).
The nucleic acid components synthesized by formamide and their cosmic dust analogs have been widely considered to be
the best candidates with regard to the early stages of the formation of biological molecules needed for life.
Titanium dioxide (TiO2, anatase), zircon (ZrO2), and other minerals could influence as
matrix elements for synthesis
of nucleic acid bases from formamide, which is followed by temperature and UV heating.
In the dark conditions, the experimental data on formamide adsorption at 300 K over the (001) plane of TiO2 indicate some
amount of unreacted formamide and water among the reaction products (CO, H2, NH3, HCN).
So far, some concentration of
water and its involvement in formamide/TiO2 interaction has been experimentally shown to be an
important component of the process.
In this paper, molecular dynamics (MD) simulation of interaction between a formamide-water solution and a TiO2 (anatase)
surface is performed.
A comparative MD analysis is done of the formamide-water/(TiO2, Pt) and ethanol-water/(TiO2, Pt)
systems in a temperature range from 250 to 400 K to compare their structural and diffusion properties.
|
E2-2013-19 (540.110)
Wergieluk A. et al.
Pion Dissociation and Levinson's Theorem in Hot PNJL Quark Matter
Pion dissociation by the Mott effect in quark plasma is described within the
generalized Beth-Uhlenbeck approach on the basis of the PNJL model, which
allows for a unified description of bound, resonant and scattering states.
As a first approximation, we utilize the Breit-Wigner ansatz for the spectral
function and clarify its relation to the complex mass pole solution of the
pion Bethe-Salpeter equation. Application of the Levinson theorem proves that describing the pion Mott
dissociation solely by means of spectral broadening of the pion bound state
beyond TMott leaves out a significant aspect.
Thus, we acknowledge the importance of the continuum of scattering states and
show its role for the thermodynamics of pion dissociation.
|
P15-2013-20 (2.237.428)
Didyk A.Yu., Winiewski R., Wilczynska-Kitowska T.
Changes of Surface Structure and Elemental Composition
of Components of DHPC Inner Surfaces, Irradiated with 10-MeV Quanta
in Dense Deuterium Gas
This work is a continuation and addition to [1], which presented results
on the studies of surface and elemental
compositions of Pd rod and brass screw for collection of nuclear and
chemical reaction products in a deuterium high-pressure chamber (DHPC) under
irradiation with quanta with an energy of 10 MeV during 18 h at
the electron accelerator MT-25 at the beam current 11-13 A. The DHPC
was filled with 1.2 kbar molecular deuterium, in which a Pd rod saturated with
deuterium was loaded. After irradiation the elemental compositions of
other surfaces of all DHPC elements, which were inside the DHPC in dense
deuterium, were studied using electron scanning microscope and X-ray
microprobe analysis.
It was established that all surfaces including the surface of a high-purity
palladium rod (99.995%) were covered with partly homogeneous layer or large
microparticles of lead. Also, such light elements as 6C, 8O, 11Na, 12Mg,
13Al, 14Si, 22Ti,
25Mn, 26Fe, 29Cu, 30Zn and heavy metals as 47Ag, 73Ta,
74W, 78Pt, 79Au and 82Pb were observed. The possible processes
which can cause the observed anomalies in the composition of newly created
chemical elements are discussed shortly.
|
P2-2013-21 (292.270)
Dedovich T.G., Tokarev M.V.
Analysis of Fractals with Dependent Branching by Using BC, PaC and SePaC Methods
The concept of space-time dimension
in general relativity and quantum theory is briefly discussed.
It is noted that the dimension of a discrete space can be determined
based on the Hausdorff measure.
A fractional dimension is a typical characteristic of a fractal.
The formation of hadrons in the interactions of
particles and nuclei at high energies is assumed
to have fractal properties.
The methods of fractal analysis as Box Counting (BC), P-adic Coverage (PaC) and
Systems of Equations of P-adic Coverage (SePaC) methods,
are used to determine the fractal dimension.
A comparative analysis of reconstruction of fractals
with dependent branching is performed by these methods.
The optimal values of parameters of the methods are determined.
They allow us to find the fractal dimension,
number of levels and structure of the fractal with maximum efficiency.
It is noted that the SePaC method has advantages
to the BC and PaC methods for analysis of fractals
with dependent branching.
|
P13-2013-27 (318.518)
Agapov A.V. et al.
One-Dimensional Field Analyzer of Medical Proton Beam in Radiotherapy
A Medical-Technical Complex for hadron radiotherapy of cancer patients based
on the 660 MeV proton Phasotron has been constructed and put into operation
at JINR. Upgrading of methods, hardware and software for radiotherapy is one
of the main tasks for further development of the Facility.
This article concerns one of the fields of this work: that is the
development of equipment for conformal proton beam therapy and dynamic
irradiation of deep lying target - the construction of a device for
measurement of proton beam depth-dose curve in a treatment room.
|
E19-2013-31 (354.751)
Batmunkh M. et al.
Cluster Analysis of HZE Particle Tracks as Applied to Space Radiobiology Problems
A cluster analysis is performed of ionizations in tracks produced by the
most abundant nuclei in the charge and energy spectra of the galactic cosmic
rays. The frequency distribution of clusters is estimated for cluster sizes
comparable to the DNA molecule at different packaging levels. For this
purpose, an improved K-mean-based algorithm is suggested. This technique
allows processing particle tracks containing a large number of ionization
events without setting the number of clusters as an input parameter. Using
this method, the ionization distribution pattern is analyzed depending on
the cluster size and particle's linear energy transfer.
|
P12-2013-32 (1.077.408)
Norseev Yu. V.
Study of Astatine Chemistry at the Joint Institute for Nuclear
Research (Dubna). Discovery and Study of Properties of New Inorganic
and Organic Compounds of Astatine, Creation of Radiopharmaceuticals for Therapy
This review is devoted to the discovery of a univalent positive astatine ion
which was found to be stable in aqueous solutions. For the first time a
septavalent astatine compound - a perastatate ion - was obtained.
Element-organic compounds of polyvalent astatine are successfully
synthesized. Methods of acyclic and aromatic astatinated-organic compounds
synthesis are developed. Some thermodynamic characteristics of newly
obtained organic compounds of astatine are determined. Study of therapeutic
influence of astatine-211 alpha-radiation on cancer formations is carried
out. The high therapeutic efficiency of 211At-tellurium colloid was demonstrated
in vivo on the Erlich ascite carcinoma cells.
New conditions for introducing astatine to monoclonal antibodies of ovarian
cancer type are found.
The experimental data of the selective accumulation of
3.7(dimethylamino)phenothiazine chloride (methylene blue (MTB)) targeted
with 211At (211At-MTB) in human pigmented melanoma cells are
shown; this process confirms the high affinity of the MTB to the melanin of
the tumor cells. In vivo experiments showed that 211At-MTB
introduced to mice with melanoma tumor is intensively accumulated in the
tumor.
|
E12-2013-33 (245.346)
Bolortuya D. et al.
Study of the correlation between the coal calorific value and coal ash content using X-ray fluorescence analysis
In this paper we have studied the possibility of determining the chemical elements in coal
samples using X-ray fluorescence analysis and have found a relationship between the coal calorific value and
its ash content with the coal moisture accounting. The amount of coal ash can be determined by the content of
the basic chemical elements, such as Si, Sr, Fe, and Ca. It was concluded that the calorific value of coal can
be estimated from the ash content in coal without the calorimetric measurements. These correlation coefficients
were calculated for several coal mines in Mongolia. The results are in good agreement with the results of
chemical analysis.
|
P13-2013-34 (193.008)
Pepelyshev Yu.N. et al.
Model of Dynamics of the IBR-2M Pulsed Reactor for Analysis of Fast Transients
On the basis of the program system MATLAB the nonlinear dynamics model of the IBR-2M
pulsed reactor which links values of variables at discrete moments (at moments of appearance of power pulses)
is established. The testing by means of modeling calculated processes in the IBR-2M shows the correctness of
the model. A preliminary estimate of the transfer coefficient of the linear part of the automatic regulator
is obtained.
|
P1-2013-36 (381.982)
Afanasiev S.V. et al.
Fragmentation of 7-9 GeV/c Deuterons into Cumulative Kaons
There are presented data of kaon production in the reaction
d + Be K(0 ) + X
in the xc cumulative variable region from
0.88 to 1.37. The xc  1 values correspond to internucleon distances
(the deuteron core region), where the nucleon wave functions begin to overlap forming the hadron cluster
(flucton) with density above the average one of nuclear matter. The behaviour of K+
and K- yields ratio
in this xc region can be interpreted within the framework of hypothesis of the hard quark seà increasing in
nuclei due to flucton component presence in the nuclear matter.
|
E6-2013-37 (408.671)
Izosimov I.N. et al.
Detection of Lanthanides and Actinides in Solutions by Laser-Induced Luminescence and Chemiluminescence
Application of time-resolved laser-induced luminescence spectroscopy and time-resolved
laser-induced chemiluminescence spectroscopy to detection of lanthanides and actinides in solutions is
discussed. The characteristics of chemiluminescence induced by excited lanthanide and actinide complexes
in solutions are considered. A possibility of using chemiluminescence for selective detection of actinide
and lanthanide ions having no intrinsic luminescence is discussed. It was shown that high selectivity of
detection can be reached with the use of multistep scheme of chemiluminescence excitation. It is concluded
that time-resolved luminescence or chemiluminescence laser spectroscopy can be successfully used for
selective detection of lanthanides and actinides in solutions.
|
P18-2013-38 (199.236)
Kravtsova A.V., Milchakova N.A., Frontasyeva M.V.
Multielement Instrumental Neutron Activation Analysis
of Macroalgae Cystoseira Used as Biomonitor
of the Black Sea Coastal Waters Pollution
(South-Western Crimea, Sevastopol)
For the first time for Sevastopol region the peculiarities of 26 (Na, Mg,
Al, Cl, K, Ca, Sc, V, Mn, Fe, Co, Ni, Zn, As, Br, Rb, Sr, Sb, I, Cs, Ba, Sm,
Nd, Ag, Au and U) macro- and microelements accumulation in the thalli of
brown algae Cystoseira from the coastal waters of south-western Crimea (the Black Sea)
were studied using instrumental neutron activation analysis (INAA). The
possibility of using brown algae Cystoseira as a biomonitor of coastal waters
pollution was shown.
|
9-2013-39 (8.907.291)
Êàðàìûøåâà Ã. À.
Ðàçðàáîòêà è îïòèìèçàöèÿ öèêëîòðîíîâ äëÿ ìåäèöèíñêèõ ïðèìåíåíèé
Àâòîðåô. äèñ. ... êàíä. ôèç.-ìàò. íàóê
(rus)
|
P15-2013-41 (496.716)
Didyk A.Yu., Winiewski R.
Results of Irradiation of Aluminum and Homogeneous Alloy YMn2
by 23 MeV Energy -Quanta in the Atmosphere of Molecular Deuterium at 2 kbar Pressure
Metal samples were placed in a deuterium high pressure chamber of «finger type»
(DHPC-FT) along its length. The samples were two aluminum rods, a
copper rod, two pieces of homogeneous alloy YMn2 and stainless steel
wire. The deuterium molecular pressure inside the DHPC-FT was
about 2 kbar. Irradiation of the samples was carried out by the braking
-quanta with the threshold energy 23 MeV. All the samples were
studied using a scanning electronic microscope (SEM) with roentgen
microelement probe analysis (RMPA). Significant changes in the surface
structures and element compositions are observed in all the measured samples
of aluminum, as well as full destruction of homogeneous alloy YMn2,
formation of «single crystals» of YMn2 and a structure similar to
crystals on the base of Mn. A phenomenological description of the observed
phenomena and effects based on nuclear reactions with taking into
consideration some new approaches are proposed.
|
P15-2013-42 (1.153.579)
Didyk A.Yu., Winiewski R.
Results of Irradiation of Stainless Steel and Copper
by 23 MeV Energy -Quanta in the Atmosphere of Molecular Deuterium at 2 kbar Pressure
Metal samples were placed in a deuterium high pressure chamber of
«finger type» (DHPC-FT) along its length. The samples were two aluminum rods, a copper rod,
two pieces of homogeneous alloy YMn2 and stainless steel wire. The deuterium molecular pressure inside
the DHPC-FT was about 2 kbar. Irradiation of the samples was carried out by braking
-quanta with a
threshold energy of 23 MeV. All the samples were studied using scanning electronic microscope (SEM) with roentgen
microelement probe analysis (RMPA). Significant changes in the surface structures and element compositions were
observed in all the measured samples: copper, aluminum, YMn2 alloy and stainless steel.
All of the obtained
unusual results were analyzed in detail and compared with previous ones.
|
P14-2013-43 (1.288.688)
Hofman A., Didyk A., Semina V.
Effect of Radiation on Corrosion and Irradiation-Assisted
Stress Corrosion Cracking of Austenitic Stainless Steels
This paper presents the processes occurring in corrosion cracking of
austenitic steels after irradiation, effects of these processes on the
environment and the mechanical properties, as well as radiation-induced
segregation phenomenon: the influence of neutron irradiation on the
microstructure and microchemical changes resulting in a decrease of
corrosion resistance and the chemical activity of the corrosive environment.
It presents the opportunity to simulate the microstructural and
microchemical changes occurring in reactor-irradiated austenitic steels
using charged particles (ions, protons, electrons).
|
19-2013-44
Äàâêîâà Ë. Í.
Ìîëåêóëÿðíûé àíàëèç îñîáåííîñòåé ðàäèàöèîííîãî ìóòàãåíåçà ãåíîâ black è cinnabar Drosophila melanogaster
Àâòîðåô. äèñ. ... êàíä. áèîë. íàóê
(rus)
|
P14-2013-46 (170.174)
Kuklin A.I. et al.
Some Specific Features of Experiment Realization at SANS Spectrometer at IBR-2
The problems concerning specific features of experiment realization at a small
angle neutron scattering spectrometer located at the 4th beam-line of IBR-2 are discussed.
The scheme and mathematical background of the experiment are described.
The possibility of two ways of measuring the transmission, background conditions of the experiment
as well as another standard for normalization are considered. The advantages of the existing
spectrometer configuration are shown.
The density distribution of flux on the sample is presented. Formulas for scattering curve
correction are calculated. The possibility of data correction in the case of an empty cell is shown.
|
P13-2013-47 (429.684)
Arzumanyan G.M.
Multimodal Optical Platform for Condensed Matter Studies
This publication describes the functionality and performance of the
multimodal optical platform, installed and launched at the Joint Institute for
Nuclear Research in 2012. The platform, called «CARS microscope» for short, was
developed, designed and constructed to the order of JINR in Minsk, by the
Belarus-Japan joint venture «SOLAR TII» (in May 2012 the company was renamed
into «Sol Instruments»). The main functionality of the platform is based on
the microscopy and spectroscopy of spontaneous Raman scattering and its
nonlinear modification - stimulated coherent Raman scattering, known as CARS -
Coherent Anti-Stokes Raman Scattering.
|
4-2013-48 (1.619.756)
Àðñåíüåâ Í. Í.
Îïèñàíèå êîëëåêòèâíûõ âîçáóæäåíèé ñôåðè÷åñêèõ ÿäåð ñ âçàèìîäåéñòâèåì Ñêèðìà
Àâòîðåô. äèñ. ... äîêòîðà ôèç.-ìàò. íàóê
(rus)
|
P9-2013-49 (515.813)
Azaryan N.S. et al.
The Influence of the Conjugation Geometry of a Superconducting
Niobium Cavity with a Drift Pipe on Its Characteristics
Using numerical recipes geometry of connection of superconductive niobium
cavity with beam-pipe is investigated. Calculations show the advantage of
elliptical connection of the cavity with the beam-pipe in comparison with
connection by circle: elliptical connection allows reducing the maximum
electric field strength at the cavity wall by 7-10 %.
|
P13-2013-50 (484.537)
Azorskiy N.I. et al.
Design and Test Results of NA62 Straw Detector First Prototype
The design of the NA62 detector prototype produced at JINR is described.
The detector is based on straw tubes and supposed to work in vacuum. The
results of the prototype's straw resolution and efficiency measurements made
on the CERN SPS beams are presented for various front-end electronics, gas
mixtures and beam rates. Prescriptions are given for the full-scale
detector design.
|
P18-2013-52 (258.926)
Molokanova L.G., Nechaev A.N., Apel P.Yu.
The Effect of Surfactants' Concentration on the Geometry of the Formed Pores by Etching of the
Polyethelene Naphtalate Films Irradiated with High-Energy Ions
A process of alkaline etching of latent tracks of high-energy heavy ions in
polyethelene naphtalate is studied. Surface-active agents have been added to the alkaline etching
solution. The presence of surfactants thus provides the formation of non-cylindrical spindle-shaped pores
in the track etched membrane. A method for the quantitative assessment of the spindle-shaped morphology
of pores has been developed. The influence of the alkali concentration, temperature of the etching solution,
and the surfactants' concentration on the membrane pore structure and its transport properties has been
investigated. The synthesis conditions which allow one to produce track membranes (as compared to TM
with cylindrical pores) with the best transport properties have been found.
|
D9-2013-53_eng (571.060)
Meshkov I.N.
Barrier Bucket Method in Cyclic Accelerators
The paper describes the main principles of the Barrier Bucket Method of
charge particles stacking and acceleration in proton synchrotrons. The
consideration is done with two models of «rectangular barriers» and
«quasi-sinusoidal» ones using different approaches to analysis of particle
motion. The first of them - so-called «step by step approach», allows us
to give a very clear physical explanation of the method and obtain easily
the main characteristics of the method in analytical form. However, that is
not always an efficient way. Therefore, the general case of the «barriers»
of an arbitrary form is considered as well and differential equations of
particle phase motion are derived. This approach gives ample opportunities
for analysis and numerical simulations of different phase dynamics regimes
of particles in cyclic accelerators. Numerical examples for the method
illustration are presented.
|
D9-2013-53_rus (541.399)
Meshkov I.N.
Barrier Bucket Method in Cyclic Accelerators
The paper describes the main principles of the Barrier Bucket Method of charge particles stacking
and acceleration in proton synchrotrons. The consideration is done with two models of «rectangular
barriers» and «quasi-sinusoidal» ones using different approaches to analysis of
particle motion. The first of them - so-called «step by step approach», allows us to give
a very clear physical explanation of the method and obtain easily the main characteristics of the method
in analytical form. However, that is not always an efficient way. Therefore, the general case of the
«barriers» of an arbitrary form is considered as well and differential equations of particle
phase motion are derived. This approach gives ample opportunities for analysis and numerical simulations of
different phase dynamics regimes of particles in cyclic accelerators. Numerical examples for the method
illustration are presented.
|
P19-2013-54 (261.131)
Vinogradova Yu.V. et al.
Damage and Functional Recovery of the Mouse Retina after Exposure
to Genotoxic Agents
As is known, the mature retina is characterized by high radiation resistance.
We showed earlier that ionizing radiation at a dose of 25 Gy and the chemical genotoxic
agent methylnitrosourea (MNU) in a concentration of 60 mg/kg induce acute retinal degeneration,
combined with proapoptotic protein expression. The process has a high genotoxic threshold, below which no
degeneration signs were traced.
The aim of this work was to study the damaging effect of ionizing radiation and MNU on the functional
activity of the retina and its ability to recover after exposure to these genotoxicants. The functional
activity of the mouse retina was evaluated with electroretinograms (ERG). In parallel, morphological changes
in the retina were controlled, and the TUNEL detection of the death of its cell elements was performed.
It has been shown that gamma rays or accelerated proton irradiation below 15 Gy cause no structural or functional
changes in the mouse retina, which confirms the mature retina's high radiation resistance. Irradiation with a higher
dose of 25 Gy leads to photoreceptor layer destruction. This goes along with an increase in the number of the TUNEL-positive
photoreceptors, among which are cells with fragmented nuclei, which are typical of apoptosis. MNU in a concentration of 70 mg/kg
caused the irreversible loss of the retina's physiological activity, and the morphological degeneration of photoreceptors and
their mass death. In a concentration of 35 mg/kg, however, MNU had no cytotoxic effect on the retina. Moreover, this dose caused
a reversible ERG amplitude decrease. Also, adaptive response was observed in the retina, which became apparent after two
consecutive MNU injections - first, at a dose of 17 mg/kg; then, at a cytotoxic dose of 70 mg/kg. These results point
to the possibility of the neurohormesis effect, which was described concerning the retina's exposure to ionizing radiation
and some chemicals.
|
E2-2013-56 (443.355)
Aparin A.A., Tokarev M.V.
Self-Similarity of Low-pT Cumulative Pion Production
in Proton-Nucleus Collisions at High Energies
The experimental data on inclusive spectra of the  + mesons produced
in p + A collisions at an incident proton momentum of 400 GeV/c obtained
by G.Leksin group at FNAL are analyzed in the framework of z-scaling.
Self-similarity of the hadron production in the low-pT cumualtive region is verified.
Scaling function  (z) for the Li, Be, C, Al, Cu, Ta nuclei is constructed.
It is expressed
via the invariant cross section and average multiplicity
density of charged particles.
Results of the analysis of the low-pT data are compared
with the high-pT data sets obtained by J.Cronin, R.Sulyaev and D.Jaffe groups.
A microscopic scenario of p + A interactions
in terms of momentum fractions x1,
x2 is discussed.
Indication of self-similarity of the cumulative pion production in p + A collisions
over a wide kinematical range has been found.
Based on the universality of the shape of the scaling function,
the inclusive cross sections of the + mesons
produced in p + A collisions on the Li, Be, C, Al, Cu, Ta targets
in deep-cumulatice region (x2  1/A) are predicted.
|
P13-2012-57 (1.734.949)
Astabatyan R.A. et al.
A Wide-Aperture Set-Up for Investigation of Di-Tritium Structure of Exotic Nucleus 6He
A wide-aperture set-up on the basis of low pressure (P  1 torr)
gas-filled chambers for the measurement of low-energy (Z 1 and
0.02-0.1)
reaction products at the angles close to
 180 is presented. All these chambers have
non-sensitive beam-way areas. Those areas are transparent and do not contain any matter, except the working gas.
The results of (TOF, dE, E)-identification using the 226Ra isotope and low-energy
ion beams are given.
Estimation of such set-up characteristics as angular, energy-losses, energy, time-of-flight resolutions was carried
out. The possibility of direct measurements of the nucleus excitation energy, in particular of highly-excited states
of the exotic nucleus 6He* T1 + T2, is discussed.
|
P13-2013-58 (219.937)
Astabatyan R.A. et al.
The Results of Measurements of Ion Energy Losses in the Range
of 0.01-0.06 in Thin Absorbers
The results of measurements of ion energy losses in the insufficiently known range of
= 0.01-0.06 in thin (x 2 mg/cm2)
absorbers are presented.
The energy losses and time of flight of the ions were measured simultaneously using low-pressure
avalanche gas-filled detectors at P 1 torr. Also, measurements of the ions residual energy
were made by a semiconductor detector. The energy of the ions with
0.01-0.03
was reconstructed using the time-of-flight measurements. The  E(E) dependence for
4He, Be, C, O ions is presented.
|
P4-2013-59 (99.062)
Kosmachev O.S.
On the Perspectives of Tau-Lepton Physics
Holistic description of the lepton sector shows that relativity and discrete
symmetries are the primary basis for the formation of a structure of lepton wave equations.
We call the structure of lepton sector as a set of substructures of each lepton equation which
distinguish one particle from another and describe their interactions on the basis of these differences.
Tau-leptons can decay directly into leptons and hadrons with consequent disintegration of the latter again
into leptons. This creates a unique opportunity for the study and description of the hadron structure on the
basis of relativistic substructures simular to leptons.
|
15-2013-60 (4.735.939)
Èòêèñ Þ. Ì.
Ýêñïåðèìåíòàëüíîå èññëåäîâàíèå ñâîéñòâ äåëåíèÿ è êâàçèäåëåíèÿ Hs (Z=108) ïðè ýíåðãèÿõ âáëèçè êóëîíîâñêîãî áàðüåðà
Àâòîðåô. äèñ. ... êàíä ôèç.-ìàò. íàóê
(rus)
|
P11-2013-61 (671.360)
Batgerel B., Nikonov E.G., Puzynin I.V.
Molecular Dynamic Simulation of Impact of Nanocluster with Metallic Solid Surface
We have simulated the impact of uncharged metal nanoclusters beam with solid metal surface
by molecular dynamics. The penetration depth of clusters atoms in solid material and thickness of deposited
layer on the surface are studied, depending on the energy of incident particles in the beam, the size of
nanoclusters and the frequency of beam. It has been found that the penetration depth and thickness of the surface
layer are dependent on the above parameters of nanocluster. It was also found that the thickness of deposited layer
is not dependent on size of cluster and frequency of the beam, while incident energy is increasing. The studied
problems may be of interest to obtain new materials, which have surface layer with new physical and chemical
properties that significantly differ from those of base materials.
|
9-2013-63 (4.842.167)
Æàáèöêèé Â. Ì.
Äèíàìèêà ïó÷êà â ñèíõðîòðîíàõ ñ öèôðîâûìè ñèñòåìàìè ïîäàâëåíèÿ êîãåðåíòíûõ êîëåáàíèé çàðÿæåííûõ ÷àñòèö
Àâòîðåô. äèñ. ... äîêòîðà ôèç.-ìàò. íàóê
(rus)
|
P18-2013-64 (1.180.864)
Artoshina O.V. et al.
Molecular Dynamics Simulations
of the Formamide Interaction Processes with Hydrocyanic Acid
on a Catalytic Surface of TiO2
In the presence of a catalyst and water under heating, formamide allows
synthesis of nucleic acids, nucleosides, nucleotides and other organic
compounds significant for life. The aim of this work is to study the
structural and dynamic (diffusive) processes for water-formamide and
hydrocyanic acid-formamide solutions in the presence of titanium dioxide
(with an anatase lattice) under heating.
We have simulated and compared the behavior of two systems: water-formamide and hydrocyanic
acid-formamide solutions on an anatase surface
by the molecular dynamics (MD) method. The interaction activation energies
for the temperature range of 250 to 400 K have been estimated. The
diffusion coefficients and structural radial distribution functions for
formamide, water and hydrocyanic acid on an anatase surface have been
calculated. The calculated activation energies of the water-formamide
anatase and hydrocyanic acid-formamide anatase systems are analyzed
and compared. A comparative analysis of the systems under investigation is
performed; a possible correlation between the obtained MD results and the
molecular mechanism involving formamide's interaction on the
adsorbing surface of titanium dioxide are discussed.
|
P9-2013-66 (1.398.809)
Nesterov A., Butenko A., Sidorin A.
Getter Pump and Its Work in Pumping System of the Nuclotron Beam Pipe
After modernization of the Nuclotron vacuum system a series of experimental
investigations of composition and pressure of the residual gas in the beam pipe were performed at
different parameters of the magnetic field cycle. The main goal was optimization of work of the
vacuum pumps and, in particular, investigation of a possibility to use at the Nuclotron a pump on
the basis of non-evaporated getter. The performed work has shown that the getter pump can successfully
exchange or complement the existing vacuum pumps.
|
E1-2013-68 (508.756)
Dolgij S.A. et al.
Spin-Rotating Magnet for the  L(np)
Experiment at VBLHEP JINR
The spin-rotating magnet (SRM) is purposed for the orientation rotation of the nucleon spins
in the polarized nucleon beam from the transverse (T) direction with respect to the nucleon
beam momentum to the longitudinal (L) one. The longitudinally polarized neutron beam was used
in the experiment for measuring the total cross-section difference L(np)
with parallel and antiparallel orientation of the participant L polarization.
To perform the nucleon spin rotation in the polarized nucleon beam
through the angle of 90 over the beam momentum region of
~ 1.8-5.5 GeV/c, a proper spin rotation device had to be
prepared. For this purpose, the necessary calculations of
corresponding values of the magnetic induction integral were
carried out. Using the calculations the dipole magnet of SP57
type was chosen for the L(np) experiment and
the required reconstruction of its pole tips was also
accomplished. After the SRM installation at the neutron beam
line, the appropriate apparatus set for the magnetic measurements
was prepared and the precise measurements of the whole set of the
SRM characteristics were performed.
The obtained results for the SRM magnetic field parameters were successfully
used during the L(np)
experimental runs to specify the current at this magnet coil
corresponding to the calculated magnetic induction integral for the given neutron beam momentum.
|
P9-2013-70 (172.426)
Amirkhanov I.V. et al.
Mathematical Modeling of Beam Dynamics
for Estimation of Operation Modes of Isochronous Cyclotron
The work presents the equations of motion and the numerical results of
estimating the quality of the isochronous magnetic field calculated for the
main operation mode of the AIC-144 multipurpose isochronous cyclotron
located at the Institute of Nuclear Physics, Polish Academy of Sciences, and
intended for carrying out proton radiotherapy of eye melanoma. The
main operation mode of the AIC-144 cyclotron is simulated using a new
technique. After successful realization of the current variant of the
specified operation mode on the AIC-144 cyclotron in July, 2012 and fine
tuning of amplitude of central bump of formed magnetic field in October,
2012, the beam dynamics was calculated using the programs developed at the
Laboratory of Nuclear Problems, Joint Institute for Nuclear Research.
|
P13-2013-72 (213.551)
Salamatin K.M.
Choice of Technology for Building Component System
for Neutron Spectroscopy Experiments Automation
The analysis of popular technologies RPC, dynamic linking of components, the
integration of components into the system, automating of the network
configuration for communication in a distributed system was performed. The
best option for use in automated experiments (SAE) was chosen. The
conclusion about the feasibility of developing algorithms to dynamically
link components for tasks of SAE has been made. As a result, methodological
framework for developing component-based experiments automation system is formulated.
|
P13-2013-74 (594.846)
Salamatin I.M., Salamatin K.M.
Development of Component EAS for Low Energy Physics on the Base of the Network Technology Usage
The analysis of specifics of the experiment automations systems (EAS) is
performed. Reasons of the components reusability loss are shown. The
conception of automatically integrated EAS, providing components usage in
different experiments without change of the other parts of the system and
modification EAS by the user is formulated. Key tasks, solution of which is
required for building of such system are defined and their solution with use
of modern network technologies is described. The group of designed standard
components are checked in real experiments at the reactor IBR-2.
|
P13-2013-75 (225.261)
Turek M. et al.
Numerical and Experimental Methods for Investigations of Doubly Charged Ion Production for Implantation Purpose
The paper describes production of doubly charged ions from solids and gases using a
hollow-cathode ion source with an internal evaporator heated by a spiral cathode filament and arc discharge.
The currents were 15 mA for Bi2+, 10 mA for As2+ and Al2+,
8 mA for Kr2+ and Xe2+, 5 mA for In2+ and Ge2+, enabling a moderate
(~ 1015 cm-3) dose of doubly charged ion implantations. Characteristics of the ion source are
discussed in order to choose the optimal working parameters. A numerical model of doubly and singly charged
ions in the source is briefly described. The calculated results (dependences of ion current on anode voltage)
are in good agreement with the experimental data.
|
9-2013-76 (6.107.267)
Êîñòðîìèí Ñ. À.
Ôîðìèðîâàíèå ïó÷êîâ äëÿ àäðîííîé òåðàïèè â öèêëîòðîíàõ ñ ïðîôèëèðîâàííûì ïî âåðòèêàëè ìåæïîëþñíûì çàçîðîì
Àâòîðåô. äèñ. ... äîêòîðà ôèç.-ìàò. íàóê
(rus)
|
P16-2013-77 (182.472)
Kubancak J., Molokanov A.G.
Measurements of LET Spectra of the JINR Phasotron Radiotherapy Proton Beam
Linear energy transfer (LET) is one of the most important parameters
which characterize biological effects of ionizing radiation.
The spectra of linear energy transfer at different depths of the
radiotherapy proton beam were measured using an active silicon detector
LIULIN. The spectrometer of a linear energy transfer LIULIN is a small
256-channel spectrometer-dosimeter with a silicon (Si) semiconductor
detector with an effective area of 10  20 mm and a thickness of
300 microns. LIULIN measures energy deposition in Si of each particle
passing through the detector, the spectra of energy deposited in Si can be
transformed to the LET spectra. The resulting information is written into the
flash memory and can be read by using a personal computer.
LET spectra measurements were carried out at several points of the depth
dose distribution from the proton beam entrance to the Bragg peak region and
in modified beams. Measured spectra are used to analyze the effects of
radiation on biological objects.
|
E2-2013-78 (268.967)
Ivanov E., Sidorov S.
Deformed Supersymmetric Mechanics
Motivated by a recent interest in curved rigid supersymmetries, we construct a
new type of  = 4, d = 1
supersymmetric systems by employing superfields defined on the cosets of the supergroup SU(2|1).
The relevant worldline supersymmetry is a deformation of the standard = 4, d = 1 supersymmetry
by a mass parameter m. As instructive examples we consider at the classical and quantum levels
the models associated with the supermultiplets (1,4,3) and (2,4,2) and find out interesting
interrelations with some previous works on nonstandard d = 1 supersymmetry. In particular,
the d = 1 systems with «weak supersymmetry» are naturally reproduced within our SU(2|1)
superfield approach as a subclass of the (1,4,3) models. A generalization to the
= 8, d = 1
case implies the supergroup SU(2|2) as a candidate deformed worldline supersymmetry.
|
P4-2013-79 (175.822)
Pupyshev V.V.
Length and Effective Range
of Two-Dimensional Scattering of a Quantum Particle by a Central Short-Range Potential
The derivation and qualitative analysis of the nonlinear
and linear equations adopted for calculation of the scattering
length and effective range are given. In the case of the central
square-well potential, the exact solutions of these equations are
found and studied. The connection between the effective range and
scattering length is revealed. Special attention is paid to the
cases of zero and unrestricted scattering lengths.
|
P15-2013-80 (558.889)
Didyk A.Yu., Winiewski R.
Structure and Chemical Composition Changes of Pd-Rod
and Reaction Product Collector Irradiated by 10 MeV
Braking Gamma Quanta inside High Pressure Chamber Filled
with 2.5 kbar Molecular Hydrogen
A research of the elemental composition and surface structure of a Pd~rod
saturated with hydrogen and a brass collector of nuclear and chemical
reaction products irradiated by 10 MeV braking gamma quanta in dense
molecular hydrogen gas at 2.5 kbar pressure is carried out. The changes of
the elemental composition and surface structure of the Pd~rod and collector
similar to analogous changes in the experiment carried out in dense gas
deuterium are observed. Possible explanations of the firstly observed
phenomenon are offered.
|
P4-2013-81 (244.262)
Pupyshev V.V.
Energies of Weakly-Bound and Near-Threshold Resonance States of a Quantum Particle
in the Two-Dimensional Plane
By assumption, a slow quantum particle moves in the
two-dimensional plane of the three-dimensional configuration space
and its movement takes place in the field of a central short-range
potential. It is shown that the approximated energies of the
weakly-bound and near-threshold resonance states of this particle
are defined via the roots of the transcendental equations containing
two parameters: the scattering length and effective range. The
sufficient conditions for solvability of those equations are found.
The dependence of their solutions on the parameters is studied.
|
E13-2013-82 (1.798.849)
Chirikov-Zorin I. et al.
The Design of à Module of a New Electromagnetic Calorimeter for COMPASS II
A new-generation high-granularity Shashlyk EM calorimeter read out
by micropixel avalanche photodiodes with thermostabilization based on the Peltier element is designed
and constructed.
|
9-2013-83 (4.961.185)
Ñìèðíîâ À. Â.
Äèíàìèêà ïó÷êîâ â èîííûõ íàêîïèòåëÿõ ïðè îïðåäåëÿþùåì âëèÿíèè ïðîöåññîâ ðàññåÿíèÿ
Àâòîðåô. äèñ. ... äîêòîðà ôèç.-ìàò. íàóê
(rus)
|
P15-2013-84 (160.497)
Karamian S.A. et al.
Methods for Production of 195mPt Isomer
Among nuclides promising for application in radio-therapy of patients,
the 195mPt isomer is characterized by appropriate properties. Effective ways for
optimization of the Pt isomer yield at low impurity content must be searched for.
The method based on double neutron capture by the 193Ir target nucleus with consequent population
of 195mPt through - decay allows chemical isolation of the isomer.
In the present work,
the problem is analyzed, a test experiment on Ir activation with neutrons is performed, and theoretical
estimates for the 195mPt yield are given. A full-scale model experiment at the IBR-2 reactor in
Dubna must clarify the practical efficiency of the method.
|
P4-2013-85 (388.735)
Pupyshev V.V.
Effective-Range Approximation in the Problem of Two-Dimensional
Scattering by a Central Short-Range Potential
The role of weakly-bound and near-threshold resonance states
of a quantum particle in its elastic low-energy scattering is
studied. The energies of those states are defined in the
effective-range approximation via the roots of the transcendental
equations. This approximation is also used for analysis of the
scattering. Explicit low-energy asymptotics of all partial
phase-shifts and cross-sections are obtained and investigated. These
asymptotics contain the energies of weakly-bound and near-threshold
resonance states.
|
P13-2013-86 (592.798)
Salamatin K.M.
A Variant of the Component-Based System for Spectrometry Experiments
Automation Constructed Using Network Technologies
Based on the analysis of modern network technologies and specificity of
experiment automation systems (EAS), the causes and sources of the
difficulties arising under repeated usage of EAS components are shown. The
concept of the component-based EAS which provides EAS modification in
accordance with the change of the experiment method by the user is
formulated. The key tasks necessary for the construction of such a system
are identified: the development of a universal subsystem for the experiment
method description and an environment for distributed components interaction.
The implementation of these tasks is described. Some of the developed
typical components are checked in real experiments at the IBR-2 reactor.
These results increase reliability and significantly reduce the time of
development and modification of the EAS.
|
D18-2013-87_r (1.224.701)
Pavlov S.S., Dmitriev A.Yu., Frontasyeva M.V.
Automation of Reactor Neutron Activation Analysis
The present status of the development of a software package designed for
automation of NAA at the IBR-2 reactor of FLNP, JINR, Dubna, is reported. Following decisions
adopted at the CRP Meeting in Delft, August 27-31, 2012, the missing tool - a sample changer -
will be installed for NAA in compliance with the peculiar features of the radioanalytical laboratory
REGATA at the IBR-2 reactor. The details of the design are presented. The software for operation
with the sample changer consists of two parts. The first part is a user interface and the second
one is a program to control the sample changer. The second part will be developed after installing the tool.
|
D18-2013-87_e (1.335.058)
Pavlov S.S., Dmitriev A.Yu., Frontasyeva M.V.
Automation of Reactor Neutron Activation Analysis
The present status of the development of a software package designed for
automation of NAA at the IBR-2 reactor of FLNP, JINR, Dubna, is reported. Following decisions
adopted at the CRP Meeting in Delft, August 27-31, 2012, the missing tool - a sample changer -
will be installed for NAA in compliance with the peculiar features of the radioanalytical laboratory
REGATA at the IBR-2 reactor. The details of the design are presented. The software for operation
with the sample changer consists of two parts. The first part is a user interface and the second
one is a program to control the sample changer. The second part will be developed after installing the tool.
|
P7-2013-90 (875.167)
Artukh A.G. et al.
A Secondary Beam Separator (Project of Combination of Fragment-Separator COMBAS with Ion Catcher)
The design of a facility basing on the combination of the high-luminosity
fragment-separator COMBAS and fast Ion Catcher is discussed. The main
characteristics of the COMBAS fragment-separator and Ion Catcher determining
the prospects for application of the proposed combination are presented. The
realized facility is expected to permit production of secondary radioactive
beams of higher quality in comparison with the «in-flight» separator
technique. It is planned to use the facility in a combination with a
post-accelerator for producing mono-isotopic and mono-chromatic intensive
secondary radioactive beams in a wide region of A and Z numbers. A list of
perspective scientific problems which demand high-intensity and high-quality
secondary radioactive beams is proposed.
|
P13-2013-91 (242.597)
Salamatin K.M.
DiCME - Distributed Components Messaging Environment for Low Energy Physics Experiments Automation
Complicated modern experiments automation systems (EAS) are component-based
distributed systems. Functionality and data of some components should be available to others.
RPC algorithms introduce hard components coupling and are executed synchronously in a
«one-to-one» mode, which complicates the implementation of real-time systems.
The designed layer for inter-process communication DiCME uses a new method of dynamic binding
and is a powerful tool for automatic integration of components that provides the use of the EAS
components code in different experiments without editing the other parts of the system.
|
P13-2013-92 (153.670)
Salamatin K.M.
PSJ - A Unified Subsystem for Description of Experimental Technique
Code reuse is the main methodology that reduces the development time of
complex systems. If you attempt to use the components of the experiment
automation system (EAS) in an experiment with a research method which has
not been provided, or with other experimental setup, we are faced with the
need to edit other parts of the EAS. The objective reasons for the loss of the
ability to reuse components are two. They are the hard coupling of
components and variability of experimental techniques. In this paper we
propose to solve problems related to changes in the experimental procedure,
by the use of a dedicated subsystem for description of the experimental
procedure and the construction of the EAS with standard software components.
The reasons for this decision, a description of the algorithms, and
implementation of this subsystem are presented.
|
E15-2013-93 (136.336)
Karamian S.A.
Z-Dependence of the (, ) Reaction Yield
Reactions induced by photons may be used as a probe of bonds and
correlations between nucleons inside a heavy target nucleus. Electromagnetic radiation perturbs the
nucleons only slightly unlike the influence of strongly interacting particles. The yield of
(,)
reactions could be used to test theoretical models assuming a complete -clustering, or multiquark objects
in heavy nuclei. Relative yields of (,n), (,p),
and (,) reactions have been measured
at the bremsstrahlung end-point energy of 23 MeV with several targets. Much lower probability of
(,) compared to (,p)
reactions is proved despite similar threshold and spin factors
for both types of reactions. Alpha-clustering in heavy targets is not supported. The mechanism of particle
release in nuclear reactions is discussed and some details are clarified.
|
P13-2013-94 (166.629)
Makankin A.M. et al.
A Direct Time Measurements Technique for Determining the Longitudinal Coordinates in Thin-Wall Drift Tubes
A different technique of measuring the longitudinal coordinates by the drift
tubes is considered. It is shown that the determination of the longitudinal coordinate by the
direct time method provides the best longitudinal resolution. The realization of this method
enables the development of coordinate detectors based on the straw with two-dimensional readout,
which can be fast enough and not very complex.
|
P7-2013-95 (365.357)
Sereda Yu.M.
A Study of Fragmentation of 20Ne and 40Ar Ions at the COMBAS Set-up
The main parameters of the COMBAS fragment separator are given in comparison with the
world's similar set-ups. The results of experiments to obtain the products in reactions of one-proton
stripping from the 40Ar ion beam (35 ÌeV/A) and two-neutron stripping from the 20Ne ion beam
(52 ÌeV/A) are presented. The high resolution power of the COMBAS fragment separator to produce secondary
neutron-rich and neutron-deficient beams of 39Cl and 18Ne ions, correspondingly,
is demonstrated.
|
1-2013-97 (1.603.428)
Ñàïðîíîâ À. À.
Ìîäåëèðîâàíèå è àíàëèç ðåçóëüòàòîâ èçìåðåíèÿ ïðîöåññîâ òèïà Äðåëëà-ßíà ñ îäèíî÷íûì ðîæäåíèåì W è Z áîçîíîâ íà LHC
Àâòîðåô. äèñ. ... êàíä. ôèç.-ìàò. íàóê
(rus)
|
E9-2013-99 (607.863)
Smirnov V.L., Azaryan N.S., Vorozhtsov S.B.
Preliminary Parameter Assessments of a Spiral FFAG Accelerator for Proton Therapy
Fixed-Field Alternating-Gradient (FFAG) accelerator was invented in
the 1950-60s but never progressed beyond the model stage. Starting from 2000, new interest
in this type of accelerator arose. Given advantages of the FFAG over the synchrotron, cyclotron
and linac, there are many possible applications of the accelerator. Among them, we are mostly interested
in acceleration of protons and light ions for hadron therapy. In this connection a preliminary set of parameters
of the facility was estimated and, in particular, the magnetic sector shape and corresponding dynamical properties
of the magnetic field of the accelerator were calculated. In addition, preliminary considerations about the RF
system design are given.
|
P13-2013-100 (171.525)
Kuchinskiy N.A. et al.
The Use of Segmented Cathode of a Drift Tube for Designing a Track
Detector with a High Rate Capability
Detector rate capability is one of the main parameters for designing a new
detector for high energy physics due to permanent rise of beam luminosity of
modern accelerators. One of the useful detectors for particle track
reconstruction is a straw-detector based on drift tubes. Rate capability of
such detectors is limited by the parameters of readout electronics. The
traditional method of increasing detector rate capability is increasing
their granularity (a number of «elementary»
detectors = readout channels)
by reducing of the straw diameter and/or by dividing the straw anode wire
into two parts (for decreasing the rate per readout channel). A new method
of designing straw-detectors with a high rate capability is presented and
tested. The method is based on dividing the straw cathode into parts and
independent readout of each part.
|
E2-2013-103 (241.312)
Voskresenskaya O.O., Kuraev E.A., Torosyan H.T.
Coulomb Correction to the Parameters of the Landau-Pomeranchuk-Migdal Effect Theory
Using the Coulomb correction to the screening angular parameter of
the Moli re multiple scattering theory, we obtained analytically
and numerically the Coulomb corrections to the quantities of the
Migdal LPM-effect theory. We showed that the Coulomb correction to
the spectral bremsstrahlung rate allows completely eliminating the
discrepancy between the predictions of the
LPM effect theory and its measuremens.
|
E2-2013-104 (353.030)
Aparin A.A., Tokarev M.V.
Self-Similarity of High-pT Cumulative Hadron Production
in p + A Collisions at High Energies at U70
New data on inclusive transverse momentum spectra of charged hadrons produced
in p + A collisions at U70 are analyzed in the framework of the z-scaling approach.
Self-similarity of the hadron production in the high-pT cumualtive region is verified.
Scaling function (z) for C, Al, Cu, W nuclei is constructed.
It is expressed via the invariant cross section
and the average multiplicity density of charged particles.
Results of analysis are compared with the data obtained by J.Cronin,
R.Sulyaev and D.Jaffe groups.
Self-similarity of the hadron production in p + A collisions over
a wide kinematic range is verified.
A microscopic scenario of p + A interactions
in terms of momentum fractions x1, x2 is discussed.
Indication of self-similarity of the high-pT cumulative
hadron production in p + A collisions
over a wide kinematic range has been found.
Based on the universality of the shape of the scaling function,
the inclusive cross sections of h- and h+ hadrons
produced in p + A collisions on C, Al, Cu, W targets in the high-pT
deep-cumulative region are predicted.
|
E5-2013-105 (170.490)
Zhidkov P.E.
On (W12( )
W1 ())-Solutions
of the Equation utt=
(a(u)ux)x+f(x,t)
We consider the initial value problem for the equation in the title with
u(x,0)=u0(x) 
W1()
and ut(x,0)=u1(x)
L2() L()
in the case when this equation is uniformly hyperbolic.
We prove the existence and uniqueness of a local weak solution u(x,t) of this problem such that in
particular (u(,t), ut(,t))
(W12()
W1())
(L2() L())
for any fixed t in the interval of existence.
For smooth initial data, it is proved that the life time of the smooth solution coincides with the
life time of our weak solution.
|
E4-2013-106 (499.209)
Ignatovich V.K., Nesvizhevsky V.V.
Reflection of Slow Neutrons from Powder of Nanorods
Two phenomena were recently observed: efficient diffuse reflection
of very cold neutrons (VCN) from nanostructured matter for any angle of neutron incidence
to the matter surface, and also quasispecular reflection of cold neutrons (CN) from nanostructured
matter for small angles of neutron incidence to the matter surface. In both cases, powder of diamond
nanoparticles was used as nanostructured matter, and the measured reflection probabilities by far
exceeded the values known for alternative reflectors. Both these phenomena are already used in neutron
experiments and for building neutron sources. In the present theoretical work, we consider an option of
further increasing the efficiency of nanostructured reflectors due to replacing spherical nanoparticles
by nanorods. We showed that VCN albedo from powder of randomly oriented nanorods is lower than their
albedo from powder of nanospheres of equal diameter. However, albedo of VCN and quasispecular reflection
of CN from powder of long nanorods oriented parallel to the powder surface exceed those for powder of
nanospheres of equal diameter.
|
E18-2013-107 (417.214)
Budagov J., Lyablin M., Shirkov G.
The Search for and Registration of Superweak Angular Ground Motions
The Earth's surface angular oscillations of the seismic, industrial and terrestrial
origins have been registered with the high-resolution inclinometer of a new design concept.
The microseismic peak was first recognized in the ground microradian motion.
|
P13-2013-108 (536.473)
Arzumanyan G.M. et al.
CARS Microscope: Possibilities, the First Results, Problems and Prospects
This paper describes the features and the first test measurements
carried out at the CARS microscope, launched at the Joint Institute for Nuclear Research (JINR)
in 2012. It also identifies some problems that need to be solved and the prospects for further experiments.
|
P3-2013-109 (154.917)
Rakhimov A.V. et al.
Neutron Activation Analysis of Polyethylene of Neutron Shield of EDELWEISS Experiment
In this work instrumental neutron-activation analysis
(INAA) has been applied for estimation of trace contaminations in
polyethylene used for the neutron shielding of low background setup of the
EDELWEISS experiment. In the EDELWEISS main background arises due to
radioactive decays of natural radio-nuclides in all construction materials,
even in the shield. Thus, a task of high sensitive many elements analysis of
samples from a polyethylene (PE) several tons of which is used by the
experiment as a neutron shield is highly relevant. Neutron activation
analysis is a method that gives the desired information about the PE. For
NAA, polyethylene samples with mass 1-10 g were irradiated during 5-48 h
by neutron flux 1 1014ñm-2 s-1
from WWR-SM nuclear
reactor of the Institute of Nuclear Physics of AS RUz. As a result in two
types of PE presence of 35 elements has been estimated on a level of
sensitivities 10-5-10-11 g/g.
|
E14-2013-111 (223.765)
Ionita I. et al.
Small-Angle Neutron Scattering Investigation of
Heat-Treated INCOLOY 800HT Samples: Preliminary Results
INCOLOY 800HT samples subjected for 60 days to different annealing
temperatures have been investigated by small-angle neutron scattering (SANS)
with the aim to study their microstructural evolution.
|
E1-2013-113 (256.411)
Litvinenko A.G., Litvinenko E.I.
Simulation of Dependence of the Cross Section of Beam Deuterons
Fragmentation into Cumulative Pions and Protons on the Mass of the
Target Nucleus
We consider the mechanisms that affect the production of cumulative pions
and protons in the fragmentation of incident deuterons into
cumulative pions and protons emitted at zero angle.
We argue that the peripheral dependence of the scattering cross
section on the atomic mass of target nuclei, which was
detected in experiments with medium and heavy nuclei, can be described
by scattering on target nucleons without introducing additional parameters.
|
19-2013-114
Àôàíàñüåâà Ê. Ï.
Ìîëåêóëÿðíàÿ ðàäèîáèîëîãèÿ ñëîæíîãî ãåíà vestigial Drosophila melanogaster
Àâòîðåô. äèñ. ... êàíä. áèîë. íàóê
(rus)
|
E15-2013-115 (320.936)
Bogdanova L.N., Demin D.L., Filchenkov V.V.
Study of the Mechanism of Muon Catalyzed t + t Fusion Reaction
The mechanism for the muon catalyzed fusion reaction
t + t 4Íå + 2n + 11.33 MeV is investigated. The
model of the cascade reaction with 5Íå as an intermediate state
is considered. Both the ground and the first excited states
of 5Íå are taken into account. The neutron energy spectrum
measured in the recent experiment is compared with
the Monte Carlo-simulated one. Varying reaction parameters, we
obtain optimum values for the relative weights of the 5Íå ground
and excited states and for the excitation energy and width of the
excited state.
|
P4-2013-116 (154.531)
Gusev A.V.
About the Restrictions on Formulation of the Faraday Electromagnetic
Induction Law
In the educational literature the electromagnetic induction law is given by
the formula FMC =-d /dt, where FMC is the electromotive force
in any circuit L, is the flow of induction
B across any surface S, limited by this circuit.
Sometimes the electromagnetic induction law is given by
another formula:
rot E = - B/t.
But these formulas have a
limited area of use, not quite corresponding to the fundamental phenomenon
of electromagnetic induction. In some cases pupils can make fallacies from
these formulas.
In this article the author offers more universal formulas for the
electromagnetic induction law.
These formulas allow calculating the FMC and electric field E
in circuits of different forms, and not obligatory closed-circuits.
In the article it is demonstrated that the vector potential A
is a fuller characteristic of the magnetic field than the
induction B.
The vector potential A
gives a more complete presentation about the
cause of appearance of E and FMC.
A/t
(not B/t) is the cause
of induction (appearance) of E and FMC.
|
1-2013-117
Êàïèøèí Ì. Í.
Äèôðàêöèîííûå ïðîöåññû â ãëóáîêîíåóïðóãîì ýëåêòðîí-ïðîòîííîì ðàññåÿíèè íà êîëëàéäåðå HERA
Àâòîðåô. äèñ. ... äîêòîðà ôèç.-ìàò. íàóê
(rus)
|
P11-2013-118 (672.975)
Ablyazimov T.O. et al.
A Kalman Filter Method for the Charged Particles Trajectories Reconstruction
in the CBM Experiment and Its Parallel Implementation at the JINR LIT Manycore Server
The charged particles trajectories reconstruction is one of the most important tasks in the
CBM experiment (GSI, Germany). The experiment assumes a full online event reconstruction that
requires development of fast algorithms which harness the potential of modern CPU and GPU architectures
to the best advantage. This work scrutinizes the Kalman filter based track reconstruction algorithm and discusses
its implementation under different parallelization approaches. To perform the analysis, a manycore server with
two Intel Xeon X5660 CPUs and a NVidia GTX 480 GPU (LIT, JINR) was used.
|
P12-2013-119 (1.148.953)
Khalansky D.A. et al.
Concentration Dependence of Microstructure Properties of Electrolytic Systems
A novel data obtained in the present work deals with the parameterization
strategies and adjustment of the ionic force fields of the alkali cations
and halide anions. In the present work, using molecular dynamics (MD)
simulation technique, we have investigated four electrolytic systems -
HCl-H2O, LiCl-H2O, NaCl-H2O and KCl-H2O - as binary
mixtures of water and cations and anions, respectively. For two of the four
electrolytes, namely for the HCl-H2O and NaCl-H2O models, the
intermolecular interaction parameters were varied, to simulate the
possibilities of formation of various ionic shells during the interaction
with water.
It is demonstrated that the variation of the potential parameters induces a
strong effect on the dynamical and structural characteristics of the
electrolyte systems. The MD simulations were performed in the temperature
range of 300 to 600 K with step of 50 K. The MD simulations for all electrolyte
models (HCl-H2O; LiCl-H2O; NaCl-H2O; KCl-H2O) were
also realized on different molar fractions of electrolytes with regard to
the concentration of water solvent, - 50:50 (16 mol/kg), 33:66 (8 mol/kg) and 4:96 (1 mol/kg).
The diffusion activation energies were calculated on the basis of Arrhenius
equation, thereby constructing the temperature dependence graphs of
diffusion coefficient for all four electrolyte systems. The observed
diffusion properties of the electrolyte systems were found to correlate well
with the energetical and structural radial distribution data.
|
P9-2013-120 (710.390)
Gikal B.N. et al.
Development, Creation and Start-up
of DC-110 Heavy Ion Cyclotron Complex for Industrial Production of Track Membranes
The cyclotron of heavy ions DC-110 for industrial production of track
membranes has been developed and created at the Laboratory of Nuclear Reactions, JINR.
The cyclotron is equipped with an electron-cyclotron resonance ion source, working at 18 GHz frequency.
In 2012 the accelerating complex was put into operation, beams of 40Ar6+,
86Kr13+, 132Xe20+ ions of 2.5 MeV/nucleon energy and intensity of 13, 14.5 and
10.5 A accordingly have been obtained. On the specialized channel, irradiation of a polymeric
film has been carried out, track membranes with high uniformity pores have been obtained.
DC-110 accelerating complex is capable of making up to 2 million square meters of track membranes per year.
|
E9-2013-121 (1.483.813)
Samsonov E.V. et al.
Numerical Simulation of Ion Acceleration and Extraction in Cyclotron DC-110
At the Flerov Laboratory of Nuclear Reactions of JINR, in the framework of the
project BETA, a cyclotron complex for a wide range of applied research in
nanotechnology (track membranes, surface modification, etc.) is being created. The
complex includes a dedicated heavy-ion cyclotron DC-110, which yields
intense beams of accelerated ions Ar, Kr and Xe with a fixed energy of 2.5 MeV/A. The cyclotron is
equipped with external injection on the base of ECR
ion source, a spiral inflector and the system of ion extraction consisting
of an electrostatic deflector and a passive magnetic channel.
The results of calculations of the beam dynamics in measured magnetic field
from the exit of the spiral inflector to the correcting magnet located outside the
accelerator vacuum chamber are presented. It is shown that the design
parameters of ion beams at the entrance of the correcting magnet will be
obtained using a false channel, which is a copy of the passive channel,
located on the opposite side of the magnetic system. Extraction efficiency
of ions will reach 75%.
|
E13-2013-122 (873.197)
Batusov V. et al.
The Laser Reference Line Method and Its Comparison to a Total Station in an ATLAS-Like Configuration
A new type of measuring system, the Laser Reference Line (LRL), is proposed as a
metrological tool and can be used within limited space to ensure a precise
installation along an axis on the ATLAS interaction point. A simplified
ATLAS-like beam-pipe mock-up is used for this test. The coordinates of the
beam pipe are measured three times using the new method and a Total Station.
The measurements agree within the measurement error of the Total Station,
which indicates that the precision of the laser reference line is suitable
for this specific task in the ATLAS experiment.
|
E13-2013-123 (2.135.586)
Budagov J. et al.
A Laser-Based Fiducial Line for High-Precision Multipoint Alignment System
The next generation of linear colliders is very demanding concerning the
alignment tolerances of their components. For the CLIC project, the
reference axis of the components will have to be pre-aligned within
10 m at 1 sigma with respect
to a straight line in a sliding window of 200 m.
A solution based on stretched wires with wire positioning sensors has been
proposed in order to fulfill the alignment requirements in the Conceptual
Design Report of the project. This solution has some drawbacks and laser-based alternative
solutions are under study in order to validate the wire
solution and possibly replace it.
A new proposal is introduced in this paper, using a laser beam over 150 m as
a straight alignment reference, with the objective of having an uncertainty
in the determination of its straightness within 10 m. Sensors, coupled
to the components to be aligned, would provide after calibration the
horizontal and vertical offsets with respect to the laser beam, within a few
micrometers, in their coordinate system.
The method is based on the laser beam space stabilization effect when a beam
propagates in atmospheric air inside a pipe with standing acoustic wave. The
principal schemes of corresponding optoelectronics devices and temperature
stabilization solutions are also proposed, making probable the extension of
the laser fiducial line up to a 500 m length.
|
E13-2013-124 (2.164.298)
Budagov J. et al.
Air Temperature Stabilization in the Thermally Isolated Optical Laboratory
For the studies and calibration of optoelectronic components of the
high-precision laser-based metrology systems, a large volume (50 m3)
thermoisolated lab based on a seismic isolated concrete block has benn created.
The inside lab volume temperature stabilization for the daily observation at
16.5 is 0.05 with
0.015 temperature
difference between maximal space separated points. This work was initiated
by the needs of high-precision alignment of accelerator components of the
CLIC, ILC-type colliders.
|
P9-2013-125 (207.467)
Gikal B.N. et al.
The Correction of Vertical Shifting of the Extracted Beam at the Test Operation of DC-110 Cyclotron
The specialized heavy ion cyclotron DC-110 has been designed and created by the
Flerov Laboratory of Nuclear Reactions of the Joint Institute for Nuclear Research for scientifically
industrial complex BETA placed in Dubna (Russia). DC-110 cyclotron is intended for accelerating the intense
Ar, Kr, Xe ion beams with fixed energy of 2.5 MeV/nucleon. The commissioning of DC-110 cyclotron has been
carried out at the end of 2012. The project parameters of the ion beams have been achieved.
During commissioning of cyclotron the vertical displacement of the beam at the last orbits and at the extraction
channel was revealed. The calculations and experiments have shown that the reason of this displacement is the radial
component of magnetic field at the median plane of the cyclotron, which appears because of asymmetry of the magnetic yoke.
Correction of the vertical displacement of the beam has been achieved by creating an asymmetry of current distribution
in the main coils of the electromagnet.
|
P7-2013-126 (148.746)
Gikal B.N. et al.
Neutron Yield at an Irradiation of Constructional Metals by Heavy Ions with Energy 2.5 MeV/nucleon
On the cyclotrons CYTRACK and DC-110 neutron yield is measured at an irradiation
of constructional metals and a polymeric film by Ar, Kr and Xe ions with energy of 2.4 and 2.5 MeV/nucleon.
The angular distributions of neutrons from the target are measured. Program code of LISE++ is used for
analysis and extrapolation of the obtained experimental data. The program code has been tested on the experimental
data found in the literature. As a result of the comparison it is established, that results of calculation coincide
with experimental data within difference factor of 2.
|
D13-2013-127_rus (2.814.568)
Alekseev I. et al.
DANSSino: A Pilot Version of the DANSS Neutrino Detector
DANSSino is a reduced pilot version of a solid-state detector of reactor
antineutrinos (to be created within the DANSS project and installed under the industrial
3 GW reactor of the Kalinin Nuclear Power Plant - KNPP). Numerous tests performed
at a distance of 11 m from the reactor core demonstrate operability of the chosen design and reveal
the main sources of the background. In spite of its small size
(20 20 100 cm), the pilot
detector turned out to be quite sensitive to reactor antineutrinos, detecting about 70 IBD events per
day with the signal-to-background ratio of about unity.
|
D13-2013-127_eng (2.069.967)
Alekseev I. et al.
DANSSino: A Pilot Version of the DANSS Neutrino Detector
DANSSino is a reduced pilot version of a solid-state detector of reactor
antineutrinos (to be created within the DANSS project and installed under the industrial
3 GW reactor of the Kalinin Nuclear Power Plant - KNPP). Numerous tests performed
at a distance of 11 m from the reactor core demonstrate operability of the chosen design and reveal
the main sources of the background. In spite of its small size
(20 20 100 cm), the pilot
detector turned out to be quite sensitive to reactor antineutrinos, detecting about 70 IBD events per
day with the signal-to-background ratio of about unity.
|
E15-2013-128 (302.069)
Testov D., Kuznetsova E., Wilson Jh.
Simulations for the Neutron Detector TETRA with MCNP
To study the nuclear structure of -delayed neutron precursors at
ALTO ISOL-facility at IPN (Orsay), the high efficiency 4 neutron detector TETRA
with 3He filled counters built at JINR (Dubna) was modified. The MCNP simulations
to optimize the future configuration were necessary. The details of the calculations and
the major results obtained are discussed.
|
P18-2013-129 (638.445)
Arzumanyan G.M. et al.
Up-Conversion Luminescence of Oxyfluoride Glasses and Nano-glass-ceramics Based on Them,
Doped with Er3+ and Er3+/Yb3+ Ions: Spectral and Structural Characteristics
The paper is devoted to the study of spectral and structural characteristics
of up-conversion luminescent (UCL) transparent oxyfluoride glass materials
doped with rare earth elements Er3+ and Er3+/Yb3+. Excited
with the 980 nm laser, green, red and near IR UCL bands were registered for
all samples under study, both before and after their heat treatment. In the
heat treated samples the intensity of the up-conversion increased
significantly due to the formation of nano-crystalline phase of lead
fluoride PbF2 in a glass matrix (nano-glass-ceramics). The structural
analysis of the samples conducted with the method of small-angle neutron
scattering (SANS) and the X-ray diffraction analysis (XRD) showed the
cluster organization of nanocrystals of PbF2 in heat treated samples.
|
E1-2013-130 (229.112)
Janek M. et al.
GEANT4 Simulation of dp Non-mesonic Breakup Reaction
at 300 and 500 MeV
GEANT4 simulations of the reaction dp ppn, i.e.
the dp non-mesonic breakup reaction, at 300 and 500 MeV
of deuteron energy for different detector configurations are presented.
Two threads made from polyethylene and carbon with the thickness of
10 m are used as targets.
The goal of the simulations is to find a method
by means of which the signal from the dp non-mesonic breakup can be separated from the
background that mainly comes from the carbon content of the CH2 target.
The obtained results will be used in the experimental spin program that will be
realized at the Nuclotron in Dubna. The aim of this experimental
investigation is to contribute to the elucidation of the structure of the
spin-dependent parts of the nucleon-nucleon and three-nucleon forces acting in the
dp non-mesonic breakup. The deuteron energies will be ranging from
300 up to 500 MeV.
|
E14-2013-131 (111.664)
Eze Ch.P. et al.
Elemental Composition of Coal Fly Ash:
Matla Coal Power Station in
the Mpumalanga Province in South Africa Case Study Using Nuclear and Related
Analytical Techniques
Epithermal neutron activation analysis along with ICP-OES, LA ICP-MS,
and XRF were used to determine the elemental composition of coal fly ash from the Malta coal power
station in the Mpumalanga province of South Africa. A total of
54 major, trace and rare-earth elements were obtained by the four analytical techniques. The results were compared
and the discrepancies discussed to show the merits and drawbacks of each of the techniques. It was shown that the
elemental content of this particular coal fly ash are of the same order as the NIST standard reference material Coal
Fly Ash 1633b.
|
P18-2013-132 (3.107.585)
Aleksakhin V.Yu. et al.
Detection of Diamonds in Kimberlite by Tagged Neutron Method
Innovation technology for diamond detection in kimberlite based on the tagged
neutron method is proposed. The results of experimental researches on
irradiation of kimberlite samples with fast tagged neutrons with energy 14.1 MeV
are discussed. The source of tagged neutron flux is a portable neutron
generator with a built-in 64-pixel silicon alpha detector with double-sided
stripped readout. Characteristic gamma rays produced as a result of
inelastic neutron scattering on nuclei of chemical elements included in the
composition of kimberlite are registered by six gamma-ray detectors based on
BGO crystals. The criterion for diamond presence is an increased carbon
concentration within the certain volume of kimberlite sample.
|
E4-2013-133 (190.849)
Severyukhin A.P. et al.
Complex Configuration Effects on -Decay Rates
Starting from the separabelized Skyrme interaction we study the
influence of the coupling between one- and two-phonon terms in the
wave functions and the tensor force effects on properties of
Gamow-Teller states. We observe a redistribution of the GT
strengths due to the tensor correlation influence on the 2p-2h
fragmentation of GT states. The --decay half-lives are
decreased by these effects. As an example, we describe available
experimental data for the N = 50 isotones and give predictions for
76Fe which is important for stellar nucleosynthesis.
|
E2-2013-134 (365.938)
Contrera G.A., Grunfeld A.G., Blaschke D.B.
Phase Diagrams in Nonlocal Polyakov-Nambu-Jona-Lasinio Models Constrained
by Lattice QCD Results
Based on lattice QCD-adjusted SU(2)f nonlocal
Polyakov-Nambu-Jona-Lasinio (PNJL) models, we investigate how the
location of the critical endpoint in the QCD phase diagram depends on the
strength of the vector meson coupling, as well as on the Polyakov-loop (PL)
potential and the form factors of the covariant model. The latter are
constrained by lattice QCD data for the quark propagator. The strength
of the vector coupling is adjusted so as to reproduce the slope
of the pseudocritical temperature for the chiral phase transition at low
chemical potential extracted recently from lattice QCD simulations.
Our study supports the existence of a critical endpoint in the QCD phase
diagram albeit the constraint for the vector coupling shifts its location
to lower temperatures and higher baryochemical potentials than in
the case without it.
|
11-2013-135
Âî ×îíã Òõàê
×èñëåííîå èññëåäîâàíèå ìîäåëåé âîëíîâîé è êâàíòîâîé ôèçèêè â ïîñòàíîâêå îáðàòíîé ïàðàìåòðè÷åñêîé ñïåêòðàëüíîé çàäà÷è
Àâòîðåô. äèñ. ... êàíä. ôèç.-ìàò. íàóê
(rus)
|
E11-2013-137 (264.643)
Akishina T.P., Ivanov V.V., Stepanenko V.A.
Massive Calculations of Electrostatic Potentials and Structure Maps of Biopolymers
in a Distributed Computing Environment
Among the key factors determining the processes of transcription and translation are the
distributions of the electrostatic potentials of DNA, RNA and proteins.
Calculations of electrostatic distributions and structure maps of biopolymers on computers
are time consuming and require large computational resources. We developed the procedures for organization
of massive calculations of electrostatic potentials and structure maps for biopolymers in
a distributed computing environment (several thousands of cores).
|
E2-2013-139 (569.158)
Aparin A.A., Tokarev M.V.
Self-Similarity of Low-pT Cumulative Pion Production
in Proton-Nucleus Collisions at U70
The data on inclusive momentum spectra of
mesons produced
in p + A collisions over the range pL = 15-65 GeV/c and
lab = 159
at U70 are analyzed in the framework of z-scaling approach.
Self-similarity of the pion production in the low-pT cumualtive region is verified.
Scaling function (z) for Be, C, Al, Ti, Mo, W nuclei is constructed.
It is expressed via the invariant cross section
and the average multiplicity density of charged particles.
Results of the analysis are compared with data obtained by J.Cronin,
R.Sulyaev, and D.Jaffe groups at pL = 70, 400 GeV/c,
pT > 1 GeV/c
and cms  90.
A microscopic scenario of p + A interactions
in terms of momentum fractions x1, x2 is discussed.
Indication of self-similarity of the low-pT cumulative
pion production in p + A collisions was found.
Universality of the shape of the scaling function is used
to predict inclusive cross sections of + and - pions
produced in p + A collisions on Be, C, Al, Ti, Mo, W targets
in the deep-cumulative region (x2 1/A).
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P9-2013-140 (2.278.148)
Averichev A.S. et al.
Results of the 46th and 47th Nuclotron Runs
The 46th Nuclotron run was performed from 15 November to 24 December,
2012, the 47th run - from 20 February to 28 March, 2013. As a result of
works for energy increase, the deuteron beam was accelerated up to 5.1 GeV/u,
the slow beam extraction was realized at 4.8 GeV/u. Investigations of
stochastic cooling were prolonged in the framework of R D works for the NICA
collider. Cooling of the longitudinal degree of freedom of the circulating
beam was obtained during run No.47. Experimental segment of the NICA
automatic control system based on Tango concept was put into the test
operation. These and other results of the machine development shifts are
presented in this report.
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E13-2013-141 (353.044)
Afanaciev K. et al.
Response of LYSO:Ce Scintillation Crystals to Low-Energy Gamma Rays
The LYSO crystals with dimensions of 30 30 130 mm and
10 10 10 mm are tested with different gamma sources.
Energy resolution and linearity of the energy response in the energy range of 511-1333 keV are
measured. It is found that crystals have good linearity of the energy response in the entire tested energy range.
Longitudinal light response nonuniformity of the long crystal is found to be less than 3.2% within the
30-120 mm range along the crystal axis.
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