2016 

20169 (3.003.816)
Brief Review of Topmost Scientific Results Obtained in 2015 at the Joint Institute for Nuclear Research

P1520161 (14221.520)
Didyk A. Yu., Gulbekyan G. G., Myshinskiy G. V.
Anomalies on the Inner Surfaces of the Xenon HighPressure Chamber
XeHPC 250 Bar with the Synthesis of Microparticles of Complex Composition
under Irradiation with Bremsstrahlung Threshold
Energy of 10 MeV
Natural xenon at an initial pressure of 250 bar in a special chamber (XeHPC)
was irradiated for 60 h 16 min (2.17· 10^{5} s) by braking γrays with
a threshold energy of 10 MeV at the electron accelerator MT25 at an average
intensity of the beam of 20–22 µA. With increase in temperature the
pressure in the steady
state at the beginning of exposure grew up to 270 bar. After opening of the XeHPC both internal chambers
with all the structures and particles, but without gas, were measured using
a γgermanium detector.
Visual inspection of the inner chambers showed visible dense greenishyellow
coating of
significant thickness formed on their
surfaces.
Xray microprobe analysis (RMPA) and SEM studies allowed us to determine the composition of the synthesized particles.

P1120164 (255.5)
Amirkhanov I.V. et al.
Investigation of QuasiStationary States in the DoubleBarrier Open Well
In this paper an investigation of solutions of quasistationary states in
the framework of the Schroedinger equation with complex energies with
piecewise constant potentials for various values of the parameters of the
potential is conducted. Quasilevels are found for the under and
abovebarrier cases. For the given potential barrier heights the number of
underbarrier quasilevels for the doublebarrier potential is more than for
the singlebarrier potential. The calculations show that the real part of
the energy varies smoothly and the imaginary part of the energy changes
irregularly when changing the parameters of the potential.

P920166 (927.7)
Nozdrin M.A. et al.
Diagnostics at JINR LHEP Photogun Bench
The photoinjector electron beam quality dramatically depends on the laser driver beam quality. For laser beam diagnostics a "virtual cathode"
system was realized at the JINR LHEP photogun bench. The system allows one to image laser beam profile at the cathode. The AVINE software complex developed in
DESY Zeuthen is being used for imaging. Equipment for emittance measurement using the slit method was installed. The original emittance calculation software
EmCa was created and tested with the laser beam.

E1720168 (116.0)
Bogolubov N.N. (Jr.), Soldatov A.V.
Variational Master Equation Approach to Dynamics of Magnetic Moments
Nonequilibrium properties of a model system comprised of a
subsystem of magnetic moments strongly coupled to a selected Bose
field mode and weakly coupled to a heat bath made of a plurality
of Bose field modes were studied on the basis of nonequilibrium
master equation approach combined with the approximating
Hamiltonian method. A variational master equation derived within
this approach is tractable numerically and can be readily used to
derive a set of ordinary differential equations for various
relevant physical variables belonging to the subsystem of magnetic
moments. Upon further analysis of the thus obtained variational
master equation, an influence of the macroscopic filling of the
selected Bose field mode at low enough temperatures on the
relaxation dynamics of magnetic moments was revealed.

P13201610 (405.9)
Pepelyshev Yu.N., Tsogtsaikhan Ts.
Prediction of the Thermal Dynamic Parameters Fluctuation of Coolant System of the IBR2M Reactor Using Neural Networks
This paper presents an artificial neural network method for longterm
prediction of the thermal dynamic parameters of primary coolant circuit of
the IBR2M reactor. The main goal is to predict the temperature and liquid
sodium flow rate through the core and thermal power. It is shown that the
prediction can reduce three times the effects of slow reactivity
fluctuations in power and decrease the requirements for the automatic power
stabilization system. Nonlinear autoregressive neural network (NAR) with
local feedback connection has been considered. The results of prediction
error ~ 5% coincide with the experimental ones.

P11201614 (1.859.0)
Batgerel B., Nikonov E.G., Puzynin I.V.
A Procedure for Constructing Symplectic Numerical Schemes for Solving Hamiltonian Systems of Equations
A new procedure for constructing symplectic numerical schemes for solving the Hamiltonian systems of equations is proposed.
A method for symmetrization of the obtained symplectic numerical schemes is suggested. The numerical schemes constructed by the above procedure conserve the energy
of a system on the large interval of numerical integration for relatively large integration step in comparison with the Verlet method which is usually used for
solving equations of motion in molecular dynamics. Results of numerical experiments are given. These results show the main advantages of the obtained symmetric
symplectic numerical schemes of the third order of accuracy for the integration step for the Hamiltonian systems of equations in comparison with numerical schemes
of the Verlet method of the second order of accuracy.

P16201616 (241.610)
Mokrov Yu. V., Morozova S. V.
The Research of the Correspondence of the Indication of the Neutron
Dosimeter Based on ^{10}Â Counter with Moderator to the Ambient
Dose in the Fields of U400M at LNR
The calculated results of the research correspondence of the indication of
dosimeter based on the ^{10}Â counter with polyethylene moderator to the
ambient dose equivalent behind the U400M are presented. It was shown that
the instrument can be used to measure the ambient dose with the uncertainty
25 % in radiation monitoring at LNR cyclotrons. Value of correction
coefficient for this dosimeter behind the cyclotron shield is 0.9.

P13201617 (156.5)
Pepelyshev Yu.N., Popov A. K., Sumkhuu D.
Estimation of Power Feedback Parameters of the IBR2M Reactor by Square Wave Reactivity
Parameters of the IBR2M reactor power feedback (PFB) are estimated based on
the analysis of power transients caused by deliberate square wave reactivity
when the pulsed reactor operates in the selfregulation mode.
The PFB of the IBR2M is described by three linear firstorder differential
equations.
Two components of the PFB are responsible for the negative feedback and one,
for the positive. The overall feedback is negative, i.e., it has a
stabilizing effect for the operation of the reactor.
The slowest negative component of the PFB is probably caused by heating of
the fuel.
Periodically repeated in the process of exploitation, estimation of the PFB
parameters is one of the methods to ensure safety operation of the reactor.

P15201619 (1.423.912)
Didyk A. Yu. et al.
Synthesis of Microparticles with Complex Compositions in a Xenon HighPressure Chamber (550 bar)
under Irradiation by Braking Radiation with a Maximum Energy of 10 MeV
Natural xenon at a pressure of 550 bar
in a high pressure chamber (XeHPC) was irradiated by 2,59 · 10^{5} s
bremsstrahlung with a maximum energy of 10 MeV at the electron accelerator
MT25 microtron with an electron beam intensity of 20–22μA. The final electron
fluence was 4,74 · 10^{19} electrons. The growth of pressure versus temperature
during the stationary exposure mode grew at first up to 620 bar and then dropped to 550 bar.
After opening of the XeHPC both of the internal chambers with all the structures, but without gas,
were measured using a γgermanium detector (Canberra) during 15 h each for measurement of the background and shortlived isotopes.
During a visual inspection of the interior surfaces of the XeHPC inner assembly, a visible coating of substantial thickness and greenishyellowish
color was observed. The research carried out by scanning electron microscopy (SEM) and Xray microprobe analysis (XMPA)
allowed us to determine the elemental composition of synthesized particles.

P13201620 (1.004.3)
Pepelyshev Yu.N. et al.
Application of the Properties of Toeplitz Matrices of the Noise Correlation Characteristics to the Diagnostics of the IBR2M Pulsed Reactor
The safeguarding of a nuclear reactor during the operation process is one of
the most significant tasks. The difficulty is in the necessity to use
nondestructive methods. One of such perspective methods is the neutron noise
diagnostics of a nuclear reactor.
Possibility of the noise diagnostics by the new method of norms of positive
definite Toeplitz correlation matrices is studied. The advantage of this
method is its purely mathematical nature; no model of the process is
employed.
The neutron noise analysis of the IBR2M pulse energy has been carried out
by the represented method. Both the static state and dynamic
state of the reactor have been studied.
Frequency analysis of unstable components of the reactor noise has been
carried out. The main unstable components of the neutron noise are
frequencies of 0.8 and 1.6 Hz, which are conditional on the vibration of the
movable reflector blades of the reactivity modulator. The results of this
diagnostics have been compared with the results of the classical spectral
analysis.

E7201621 (292.6)
Volkov V.V., Cherepanov E.A., Kalandarov Sh.A.
Interpretation of the Mechanism of Spontaneous Fission of Heavy Nuclei in the Framework of Dinuclear System Conception
A new approach to the interpretation of the process of spontaneous fission
of heavy nuclei is suggested. It is based on nuclear physics data which are
obtained in heavy ion collisions. The process of spontaneous fission
consists of three sequential stages: clusterization of the valent nucleons
of a heavy nucleus into a light nucleuscluster, which leads to the
formation of a dinuclear system; evolution of the dinuclear system which
proceeds by nucleon transfer from the heavy to light nucleus; and decay of
the dinuclear system from the equilibrium configuration into two fragments.

E18201622 (201.921)
Yamauchi Yu., Apel P. Yu.
Adsorption of Anionic Surfactant on Porous and Nonporous Polyethylene Terephthalate Films
We study the adsorption of anionic surfactant, sodium dodecyl diphenyloxide disulfonate (SDDD)
on three types of polyethylene terephthalate (PET) substrates from aqueous solutions of SDDD of different concentrations.
Neutral electrolyte (KCl) was added to the solutions to vary the ionic strength. Three types of substrates were used:
1) original PET film; 2) etched nonporous film, obtained from pristine film by chemical etching and bearing negative charge on the surface;
3) etched porous membranes, fabricated from pristine film by ion irradiation and subsequent chemical etching. The membranes have negative charge
on the flat surface and on the inner pore walls. The comparison shows that the negative charge on the flat surface
has weak effect on adsorption of the anionic surfactant, and the SDDD adsorption on the inner walls of pores is much
weaker than on flat surface, even if the pore radius is significantly larger than the Debye length. This «exclusion»
effect strongly depends on ionic strength of solution.

P13201623 (543.803)
Tsulaia M. I. et al.
Upgraded Experimental Setup KOLHIDA Designed to Study Interactions of Polarized Neutrons with Polarized Nuclei
We study the adsorption of anionic surfactant, sodium dodecyl diphenyloxide disulfonate (SDDD) on three types of polyethylene terephthalate (PET)
substrates from aqueous solutions of SDDD of different concentrations. Neutral electrolyte (KCl) was added to the solutions to vary the ionic strength.
Three types of substrates were used: 1) original PET film; 2) etched nonporous film, obtained from pristine film by chemical etching and bearing negative charge
on the surface; 3) etched porous membranes, fabricated from pristine film by ion irradiation and subsequent chemical etching.
The membranes have negative charge on the flat surface and on the inner pore walls.
The comparison shows that the negative charge on the flat surface has weak effect on adsorption of the anionic surfactant,
and the SDDD adsorption on the inner walls of pores is much weaker than on flat surface, even if the pore radius is significantly larger than the
Debye length. This “exclusion” effect strongly depends on ionic strength of solution.

E14201624 (664.7)
Nyamdavaa E. et al.
Preparation and Characterization of La_{1x}Ce_{x}CoO_{3} Perovskite Oxides for Energy Materials
Ceriumdoped lanthanum cobaltite perovskites (La_{1x}Ce_{x}CoO_{3}
with x = 0, 0.2, 0.4) were prepared by the solgel method (calcined for 5 h at
750ºC) and characterized by Xray diffraction (XRD), Xray absorption
(XAS), energydispersive Xray spectroscopy (EDS), and BET surface area
analysis. The results showed that the cerium doping promoted the structural
transformation of LaCoO_{3} from rhombohedral into the cubic structure.
High specific surface area and small crystallite size are achieved at x = 0.2.
The XAS results confirmed the formation of compound La_{1x}Ce_{x}CoO_{3}.

P14201626 (691.931)
Artoshina O. V. et al.
Structure and Phase Composition of the Titanium Dioxide Thin Films
Deposited on the Surface of the Metallized Track Membranes from
Polyethyleneterephthalate by Reactive Magnetron Sputtering
Thin films of TiO_{2}, Ag, AgTiO_{2}, CuTiO_{2} deposited on the
surface of polyethyleneterephthalate track membranes (TM) were investigated.
Metals and oxide deposition was carried out by the method of vacuum reactive
sputtering with application of a planar magnetron. The microstructure of
samples was studied by the scanning and transmission electron microscopy
(TEM) techniques. The elemental composition of coatings was investigated
using energydispersive spectroscopy. For the identification of phase
structure, Xray diffraction phase analysis was used at various
temperatures, and the XRD crystal structure patterns of the samples were
obtained by the selected area electron diffraction (SAED) in TEM analysis.
It was found that titanium dioxide on the TM surface can be present in three forms: nanocrystals of tetragonal anatase with impurity
of rhombic brookite and the socalled Xray amorphous TiO_{2}. Cubical Cu_{2}O was identified in TM metallized by copper.
Optical properties of composite
membranes and films were investigated by the method of absorption
spectroscopy. Calculation of energies of the direct and indirect allowed
optical transitions was carried out based on the analysis of absorption
spectra of the studied composite membranes.

P6201629 (231.164)
Gustova M. V., Maslov O. D., Sabelnikov A. V.
Application of TEVA Resin for the Separation of the Products of
Photonuclear Reaction ^{237}Np(γ, n) ^{236m}Np → (β^{–})^{236}Pu
The paper reports on the possibility of using TEVA resin (TRISKEM company),
made on the basis of the Aliquat336 extractant (a quaternary ammonium
salt), for the isolation and concentration of ^{236}Pu. The ^{236}Pu
isotope was produced as a result of the photonuclear reaction
^{237}Np(γ, n) ^{236m}Np → (β^{–})^{236}Pu using the linebreak
MT25 microtron at FLNR, JINR. Plutonium236 was separated on the TEVA
resin from ^{237}Np target. Products of (γ, f) photonuclear reactions,
daughter products of ^{236}Pu and ^{237}Np, fragments of ^{237}Np(γ, n) (^{237}Np, ^{232}U,
^{228}Th, ^{233}Pa, ^{137}Cs, etc.) induced fission were also separated. The content of the
actinide elements in ^{236}Pu was less than 10^{6} Bq/Bq.

P13201633 (500.863)
Azorskii N. I. et al.
New Type of Drift Tubes for GasDischarge Detectors Operating in Vacuum: Production Technology and Quality Control
A device for fabricating thinwall (straw) drift tubes
using polyethylene terephthalate film 36 µm thick by ultrasonic welding is described together with the technique for controlling their quality.
The joint width amounts to 0.4–1.0 mm. The joint breaking strength is 31.9 kg/mm^{2}
The argon leakage from a tube of volume 188.6 cm^{3} under a pressure gradient of 1.0 atm does not exceed 0.3 · 10^{3}cm^{3}min,
which is mainly related to the absence of metallization in the joint vicinity.
The high strength, the low tensile creep due to the absence of glued layers,
and the small value of gas leakage make the new tubes capable of reliable and longterm operation in vacuum,
which is confirmed by the operation of 7168 straw tubes for two years in the NA62 experiment.

P13201637 (653.4)
Babkin V. A. et al.
Setup for Testing of Detectors at the Nuclotron “MPD Test Beam”
A new specialized setup “MPD test beam” was created at the extracted beam
of the Nuclotron to carry out methodical research and testing detectors for
the MPD experiment at the NICA collider. The setup is described in detail.
Results of the test of fast detectors for the MPD TOF system are presented
as an example of the setup operation.

P3201639 (514.3)
Êiselev Ì. À., Zemlyanaya Å. V.
Dehydration of the Intermembrane Space in the Multilamellar Membranes of Dipalmitoylphosphatidylcholine under the Influence of Dimethyl
Sulfoxide. Neutron and Synchrotron Study
On the basis of the separated form factors method (SFF), the analysis of
data on the smallangle neutron scattering (SANS) on polydispersed
population of unilamellar vesicles of dipalmitoylphosphatidylcholine (DPPC)
in heavy water with dimethyl sulfoxide (DMSO) is carried out. It is shown
that the growth of DMSO molar fraction in water from 0 to 15% leads to
increase of thickness of the bilayer to values of the repeat distance of
multilamellar membranes of DPPC, which means a dehydration of the
intermembrane space and steric contact of the neighbor bilayers of DPPC at a
DMSO molar fraction of 15%.

P13201642 (456.7)
Omelyanenko M. M. et al.
LowNoise PulseMode Current Power Supply for Magnetic Field Measurements of Magnets for Accelerators
The described pulsemode current power supply has been designed and fabricated for the magnetic field
measurement system of superconducting magnets for accelerators. The power supply is based on a current regulator with pass transistor bank
in linear mode. The output current pulses (0–100 A) are produced by using the energy of preliminary charged capacitor bank (5–40 V),
which is charged additionally after each pulse. There is no ACline frequency and harmonics ripple in the output current,
the relative noise level is less than –100 dB (or 10^{–5} of RMS value (it is defined as the ratio of output RMS noise current
to the maximal output current 100 A within the operating bandwidth, expressed in dB).

E3201643 (1.532.519)
Vu D. C. et al.
Representation of the Radiative Strength Functions in the Practical
Model of Cascade Gamma Decay
The developed in Dubna practical model of the cascade gamma decay of
neutron resonance allows one, from the fitted intensities of the twostep
cascades, to obtain parameters both of level density and of partial widths of
emission of nuclear reaction products. In the presented variant of the model a part
of phenomenological representations is minimized. Analysis of new results
confirms the previous finding that dynamics of interaction between Fermi and
Bosenuclear states depends on the form of the nucleus. It also follows from the
ratios of densities of vibrational and quasiparticle levels that this
interaction exists at least up to the binding neutron energy and probably differs
for nuclei with varied parities of nucleons.

P15201644 (219.4)
Kabdrakhimova G. D. et al.
Investigation of the Total Cross Sections in the Interactionsof ^{6}He and ^{4}He Nuclei with Si Nuclei at 5–50 MeV/A
The analysis of the experimental excitation functions of the total cross sections of nuclear
reactions ^{6He+Si and 4He+Si in the energy range 5–50 MeV/A and a
brief overview of the techniques by which experimental data were obtained have been presented.
Detailed attention is given to the description of experiments conducted with beams of radioactive nuclei
of the accelerators of FLNR JINR. Analysis of experimental data was performed using the semimicroscopic optical model.
}

P9201647 (700.824)
Alexandrov V. S. et al.
Influence of Errors of a Solenoidal Magnetic Field of the First
Accelerating Section of LUE200 Accelerator on Electron Beam Dynamics
The analysis of results of the magnetic measurements executed on a
breadboard model of the focusing solenoid of accelerating section of
accelerator LUE200, and results of numerical modelling of dynamics of a
beam in accelerating system of the linear accelerator with the account of
the possible errors admitted in focusing fields of the linac are presented.

P9201648 (538.141)
Sumbaev A. P., Kukarnikov S. I.
The Focusing Solenoid of the First Accelerating Section of LUE200 Accelerator
Results of designing and manufacturing of the focusing solenoid of
the first accelerating section of the electron linear accelerator with a Sband traveling
wave — the driver of the the IREN facility, a pulse resonant neutrons source, are considered.
Requirements to parametres of the solenoid with the account of necessity of minimisation of
heterogeneity of a magnetic field at edges and in the area occupied with an electron beam are formulated.
Results of calculations, a design and results of measurements of magnetic fields of the solenoid after
its installation on a regular place on the linac are presented.

P13201649 (439.069)
Aksenov V. L. et al.
HighFlux Pulsed Neutron Source on the Base of Cascade Booster
A physical model of highflux neutron source based on subcritical (k_{ef} = 0,96)
twostage booster, managed by proton accelerator with energy of 600 MeV
and 0.3 MW beam power, is offered. It is shown that the thermal neutron flux will be
comparable to the flux density in the European Spallation Source (ESS),
proton beam power of which is 5 MW. Due to a short pulse the neutron diffraction experiments on
the proposed source will be almost an order of
magnitude more efficient than in ESS.

P4201650 (251.6)
Pupyshev V. V.
The Amplitude Functions Method in the Theory of TwoDimensional Scattering
In the present work, we formulate and give the mathematical foundation of the amplitude functions method. This method is adopted
for solving the radial problem of twodimensional scattering of a quantum particle by the sum of the Coulomb potential and a central
short or longrange potential.

P13201651 (724.647)
Morozov V. A., Morozova N. V.
Autocorrelation Method for Determination of Scintillator Decay Time
An autocorrelation method is developed for determining the composition and
decay time of scintillators. It also allows studying the spatial distribution of nuclear radiation and controlling the amount
of the admixture introduced in the scintillators. The decay time is measured in the range from a few nanoseconds to microseconds.
It is found that the decay time increases in plastic scintillators with a wave shifter and a Gd admixture.

E1201654 (185.621)
Baatar Ts. et al.
Thermodynamic Characteristics of the Secondary Particles Produced in π^{–}C Interactions at 40 GeV/ñ as a Function of Cumulative Number n_{c}
The multiparticle production process in π^{–}C interactions at 40 GeV/ñ has been studied on cumulative number n_{c}. Local
values of temperature, pressure, volume, and energy density in the interaction region are determined as a function of the cumulative number.
This analysis gives us an opportunity of studying a spacetime picture and the phase transition process at high energies.

P4201658 (297.178)
Pupyshev V. V.
TwoDimensional NuclearCoulomb Scattering
of a Slow Quantum Particle
The twodimensional scattering of a slow quantum particle
by the superposition of the Coulomb and shortrange potential is
studied. The analysis of lowenergy asymptotics of all radial
wavefunctions, partial phaseshifts and crosssections is given.
Two methods for calculation of the scattering length and effective
radius are proposed.

E6201662 (378.210)
Khushvaktov J. H. et al.
Interactions of Secondary Particles with Thorium Samples in the Setup QUINTA Irradiated with 6GeV Deuterons
The natural uranium assembly, QUINTA, was irradiated with 6GeV deuterons.
The ^{232}Th samples were placed at the central axis of the setup QUINTA.
The spectra of gamma rays emitted by the activated ^{232}Th samples have been analysed,
and more than one hundred nuclei produced have been identified. For each of those products,
reaction rates have been determined. The ratio of the weight of produced ^{233}U to that of ^{232}Th is presented.
Experimental results were compared with the results of Monte Carlo simulations by the FLUKA code.

P12201663 (32.057)
Molokanova L. G. et al.
Effect of Ultraviolet Radiation on Polyethylene Naphthalate Films Irradiated with High Energy Heavy Ions
The effect of UV radiation of a wide spectral range (λ = 100 – 400 nm)
on films of polyethylene naphthalate (PEN) was investigated. Changes in the optical absorption
spectra of PEN films after exposure to accelerated ions and UV radiation were studied.
Changes of the surface properties of PEN were studied and the depth of damaged polymer layer was
measured after high fluence UVirradiation.
The depth of damage was found to range between 0.1 and 0.9 µm, depending on the length of treatment.
The rate of photoablation and the quantum yield of the removal of one monomer unit (∼0.7 ⋅ 10^{–4} molecules/ photon) of PEN films under the influence of UV radiation were evaluated.
The feasibility of production of asymmetric pores in PEN films via controlled photooxidative degradation was demonstrated.

P13201665 (280.517)
Marachev A. A. et al.
Analysis of Dynamics of the IBR2M Reactor with Statistically Optimal Automatic Regulator
For the IBR2M pulsed reactor,
characterized by a high level of reactivity fluctuations and,
as a consequence, of a power pulse amplitude, two variants of an automatic regulator
(AR) are considered. Both variants satisfy the criterion of a minimum probable standard deviation
of the amplitude of the future pulse on the basis of information obtained in the previous momenta.
The difference between the AR variants is registered in the data. Since perturbations of reactivity
in the process of reactor operation contain random and regular components, transient processes in these
types of reactivity are considered for both AR variants. It is shown that the variant of AR accepted in the IBR2M,
where earlier data is given less weight, is more preferable than the variant where the information obtained from a fixed
number of the last pulses is given the greatest weight, and the earlier information is not considered at all.

P13201667 (29.202)
Pepelyshev Yu. N., Popov A. K., Sumkhuu D.
Power Feedback of the IBR2 Pulsed Reactor and Its Modernized Version IBR2M in Comparison
Based on the analysis of the power transient processes
caused by the intentional squarewave reactivity in the IBR2 and IBR2M
reactors with burnup of 800–900 MW · day, the fast power feedback
structure is substantiated. Due to the differences in the geometry of the reactor
cores and fuel structure, symmetrical oscillations of reactivity induced asymmetrical
power fluctuations in the IBR2 reactor and symmetrical ones in the IBR2M. The analysis
of the measured pulse response of the reactor feedback at a nominal power of 2 MW shows
that the IBR2M is more stable in comparison with the IBR2.
A margin of the perturbation amplitude to the stability boundary of the IBR2M is almost twice
that at the IBR2. A margin on the phase shift between the perturbing reactivity and power is large enough for both reactors.
It can be expected that the operation time of the IBR2M in the existing nominal mode with a power of 2 MW
and a flow of coolant through the core of 100 m^{3}/h before the oscillatory instability is longer than at the IBR2.

P1201671 (626.794)
Belyaev A. V. et al.
The Kinematical Fit
At measurements performed in experimental particle physics,
for every particle taking part in collision or decay, kinematical parameters such as momentum and
exit angles are fixed individually. Due to measurement errors the conservation laws of energy and
momentum are violated in this set of kinematical parameters. The procedure of ''kinematical fitting'',
which was developed as early as the sixties of the 20th century, makes values of kinematical parameters more precise,
eliminates violations of the conservation laws and makes smaller errors in parameters.

P1201672 (542.178)
Belyaev A. V., Jerusalimov A. P., Troyan A. Ju.
Extraction of Channels in Particle Interactions Using Kinematical Fitting
At studying particle interactions we often have no particle identification. In this case the task of defining the true channel arises.
One of the important numerical instruments which is used to determine the true channel of a reaction is the procedure
of &quout;kinematical fitting&quout;, which for each of the tested combinations calculates the value of the functional χ^{2} (⩾ 0).
In this work it is proposed to use the obtained χ^{2} values to attribute a specific weight to every combination.
Thus, in the proposed method all combinations (with their weight) which were successfully fitted take part in the forming of channels of a reaction.
The Kolmogorov criterion that has been applied to χ^{2}distributions, obtained with two described methods,
gives a better agreement between the experimental distributions and theoretical ones when the weight method is used.

E13201673 (217.917)
Volkov A. D.
Behavior of Welded Straws in Vacuum
The possibility of working
welded straw tubes in vacuum is considered.
The behavior of straw in a vacuum is considered
in the framework of the cylindrical shells theory. A solution
to the equilibrium state equation for a straw tube describing its behavior
under the effect of pretensioning and internal pressure is provided. The analysis of the
solution shows that the rotation of selfsupporting straws is due to the moment acting on the unfixed ends.
The estimation of strain caused by the overpressure is made. An original technique of measurement of straw Poisson's
ratio is presented and its dependence on tension is investigated. The effect of the temperature and the deformation rate on
the mechanical properties of straw is considered with polybutylene terephthalate as an example. The optimum temperature range for the
longterm straw operation in the experiment is specified.

E4201674 (160.597)
Arsenyev N. N. et al.
Effects of PhononPhonon Coupling on the Properties
of Pygmy Resonance in ^{40–48}Ca
Starting from the Skyrme interaction SLy5, we study the effect of
phononphonon coupling on the lowenergy electric dipole response
in ^{40–48}Ca. This effect leads to the fragmentation of the
E1 strength to a low energy and improves the agreement with
available experimental data.

E4201675 (99.648)
Sushenok E. O., Severyukhin A. P.
The Effect of the Unpaired Nucleons on the
βDecay Properties of the NeutronRich Nuclei
Starting from the T45 Skyrme interaction with tensor terms, the
properties of the βdecay of ^{7280}Ni are studied. We
take into account the effect of unpaired neutron and proton on the
ground state properties of oddodd and evenodd nuclei. It is
shown that the calculated Q_{β} values and the $\beta$decay
halflives are in a reasonable agreement with experimental data.

P4201677 (131.057)
Sushenok E. O. et al.
The Simultaneous Inclusion of the PhononPhonon Coupling and
Effective Interactions in the ParticleParticle Channel
A finite rank separable approach(FRSA) based on the
quasiparticle random phase approximation with Skyrme
interactions has been extended to describe chargeexchange
excitation modes. The central and tensor residual interaction in
the both particlehole and particleparticle channel and the
coupling between one and twophonon configurations are taken into
account in the framework of the FRSA model. The calculation scheme
of the βdelayed multineutron emission of the neutronrich
nuclei is presented.

P3201681 (298.101)
Maslova V. A., Kiselev M. A.
The Structure of Sodium Cholate Micelles
Sodium cholate is a bile acid salt and is used as a biological detergent.
The mixed systems of sodium phospholipidcholate are used to study the
selfassembly process of the formation of micelles and micellar systems.
Micelles composed of a mixture of a phospholipidsodium cholate are used
as carriers of drugs through the skin.
We have studied the structure of micelles of sodium cholate by smallangle
neutron scattering. It was established that the average radius of sodium
cholate micelles was (10.14 ± 0.01) Å in the sodium
cholate concentration
range from 25 to 100 mM.

D13201682 (32.429)
Glonti L. N. et al.
Determination of the Anode Wire Position in a New Type
of ThinWall Drift Tubes (Straws)
for the NA62 Drift Chambers Using Visible Light.
I. Measurements in Transmitted Light
Microscope studies of thinwall drift tubes (straws)
of a new type for the NA62 drift chambers have shown that under certain
conditions they are semitransparent and, when illuminated by directional light,
allow their anode wires to be observed in both transmitted and reflected light.
These tubes are supposed to be used in other experiments as well.
In this work, new results of the calibration measurements performed
with an accuracy of about ∼ ±12 μm using the
UIM23 microscope are presented. It is also shown that the measurements
can in principle be automated. The first semiautomatic measurements accurate to about ∼ ±0.003 μm are reported,
which are made under the MBStype microscope with a digital eyepiece.
The proposed method is much simpler than the methods based on radioactive or Xray radiation.

P4201683 (237.254)
Pupyshev V. V.
Coulomb Scattering of a Slow Quantum Particle in a Space of Arbitrary Dimension
By assumption, a charged quantum particle moves in the space of dimension
d = 2,3,… and is scattered by a fixed Coulomb center. The expansions
of the wavefunctions and all radial wavefunctions of this particle over
integer powers of the wave number and the Bessel functions of real order
are derived. It is proven that the finite sums of these expansions are the
asymptotics of the wavefunctions in the lowenergy limit.

P11201685 (476.959)
Dikusar N. D.
Optimization of a Solution in Problems of Piecewise Polynomial Approximation
Piecewise polynomial approximation (PPA) is widely used in digital
technology and data processing. Within the framework of the Basic Element
Method (BEM), optimization of the solution of PPA problems is achieved on
the basis of the functional relationship between basis functions and
applying formulas to calculate the coefficients depending on parameters of
the threepoint grid. The results of optimization and comparison with the
results of the respective Mapleprocedures are illustrated by examples of
the 12thorder BEMapproximation.

E18201688 (935.626)
Dmitrieva S. O. et al.
Determination of the Origin of the Medieval Glass
Bracelets Discovered in Dubna (Moscow Region, Russia), Using
the Neutron Activation Analysis
The work is dedicated to the determination of the origin of archaeological
finds from medieval glass using the method of neutron activation
analysis(NAA). Among such objects we can discover things not only produced in
ancient Russian glassmaking workshops but also brought from Byzantium. The
authors substantiate the ancient Russian origin of the medieval glass
bracelets of preMongol period, found on the ancient Dubna settlement. The
conclusions are based on the data about the glass chemical composition obtained
as a result of NAA of ten fragments of bracelets at the IBR2 reactor, FLNP,
JINR.

P16201689 (131.036)
Mokrov Yu. V., Morozova S. V.
The Correction of Albedo Dosimeters DVGN01 Readout at the Neutron Generator ING27 with the Help of a Spherical Albedo System
The results of readout correction for albedo dosimeters DVGN01 with
using of a spherical albedo system are presented. The measurements were carried out behind
the neutron generator ING27. On the base of the presented results the correction coefficients
were recommended for individual radiation control at the neutron generator ING27.

P3201690 (581.249)
Aksenov V. L. et al.
On Limit of Neutron Flux in Pulsed Neutron Sources Based on Fission
The upper limit of the thermal neutron flux density is obtained for fission pulsed sources for beam researches. Three types of possible configurations
are considered: multiplying target at a proton accelerator (booster), a booster with a reactivity modulation (superbooster), and a pulsed reactor.
Comparison with other highflux sources, both operating and under construction, is done.

P4201691 (1.728.721)
Zaimidoroga O. A.
The Natural Law of Transition of a Charged Particle into a Compound State
under the Action of an Electroscalar Field
This article is the continuation of article [1] where the experimental
facts of observation of the electroscalar radiation in the spectrum of the Sun have been presented.
This radiation comes into the world having a long wavelength, being longitudinal and extraordinarily penetrating.
In accordance with the principle of least action, the Lagrangian of the electroscalar field and the energymomentum
tensor are determined using variation of the potential and coordinates. The equation of motion of a charged particle
in the electroscalar field is determined where the energy of the particle has a negative sign with respect
to the particle’s mechanical energy and the energy of the electromagnetic field. So, this decreases
the electrical potential of the particle during the propagation. The electroscalar energy of the charged
particle and the field’s force acting on the particle during its motion change
the particle’s electrical status which, in its turn, may trigger the transition of the particle into a compound
state during an interaction with any object. Due to the continuity this process can lead the particle to the state where
it enters into a compound state with a negative energy at the particle’s different velocities. This state is the physical
vacuum state. Analysis of the solar spectrum demonstrates that scattering and absorption of the electroscalar wave occur
on the cavities of solids. The spreading out of the electroscalar field obeys the law of a plane wave, and the transfer
of energy and information can take place both in vacuum and in any medium.
The investigation has been performed at the Veksler and Baldin Laboratory of High Energy Physics, JINR.
Preprint of the Joint Institute for Nuclear Research. Dubna, 2016

P7201692 (427.701)
Lukyanov S. M. et al.
Cluster Structure ^{9}Be and Mechanism of Transfer Nuclear Reaction
The study of inelastic scattering and multinucleon transfer reactions was
performed by bombarding a ^{9}Be target with a ^{3}He beam at the incident energy of 30 MeV.
Angular distributions for ^{9}Be(^{3}He, ^{4}He) ^{8}Be, ^{9}Be(^{3}He,
^{6}Li) ^{6}Li, ^{9}Be(^{3}He, ^{7}Li)^{5}Li,
and ^{9}Be(^{3}He, ^{7}Be) ^{5}He reaction channels were measured.
Experimental angular distributions for the corresponding ground states (g.s.)
were analyzed within the framework of the optical model,
the coupledchannel approach and the distortedwave Born approximation.
The contributions of different exit channels have been determined confirming
that the (α + ^{5}He) configuration plays an important role.
The configuration of ^{9}Be consisting of two bound helium clusters
(^{3}He + ^{6}He) is significantly suppressed (less than 3%),
whereas the twobody configurations (𝓃 + ^{8}Be) (69%) and (α + ^{5}He) (25%) including unbound ^{8}Be
and ^{5}He are found more probable.
