541 results on '"A. A. Yukhimchuk"'
Search Results
152. RESEARCH AND DEVELOPMENT FACILITIES FOR SAFETY HANDLING WITH TRITIUM AND ITS COMPOUNDS IN FUNDAMENTAL AND APPLIED STUDY
- Author
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V. V. Perevozchikov, G. M. Ter-Akopian, A. M. Demin, Yu. I. Vinogradov, A. A. Yukhimchuk, S. K. Grishechkin, A. M. Rodin, D. L. Demin, V.M. Kharitonov, and A. N. Golubkov
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Nuclear and High Energy Physics ,Engineering ,Nuclear Energy and Engineering ,Waste management ,business.industry ,Nuclear engineering ,Condensed Matter Physics ,business - Abstract
Приводятся основные результаты работ по созданию экспериментальной базы, позволяющей безопасно проводить фундаментальные и прикладные исследования с тритийсодержащими средами в условиях неспециализированных лабораторий. Обсуждаются технические характеристики комплексов оборудования и установок, методические подходы, обеспечившие проведение исследований: явления мюонного катализа ядерных реакций синтеза; свойств лёгких экзотических ядер на границе нейтронной стабильности; явления «сверхпроницаемости» трития через металлы V группы и проницаемости водорода через конструкционные материалы, в том числе содержащие радиогенный Не; взаимодействия конструкционных материалов с изотопами водорода, включая тритий при давлении до 300 МПа.
- Published
- 2013
153. Search for the radiative capture reaction d+d → 4He+γ from the ddμ muonic molecule state
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K. I. Gritsaj, N. N. Grafov, V. V. Perevozchikov, L. N. Bogdanova, C.W.E. van Eijk, D. L. Demin, A. D. Konin, A. V. Kuryakin, S. A. Yukhimchuk, S. V. Zlatoustovskii, A. A. Yukhimchuk, V. V. Filchenkov, V.G. Zinov, V. A. Nazarov, S. M. Sadetsky, V. G. Grebinnik, Yu. I. Vinogradov, A. I. Rudenko, and Victor R. Bom
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Physics ,Nuclear and High Energy Physics ,Fusion ,Muon ,Deuterium ,Yield (chemistry) ,Radiative transfer ,Molecule ,State (functional analysis) ,Atomic physics ,Atomic and Molecular Physics, and Optics ,Beam (structure) - Abstract
A search for the muon-catalyzed fusion (MCF) reaction d+d → 4He+γ in the ddμ muonic molecule was performed using the experimental MCF installation TRITON and NaI(Tl) detectors for γ quanta. A high-pressure target filled with deuterium was exposed to the negative muon beam of the JINR phasotron to detect γ quanta with an energy of 23.8 MeV. The first experimental estimation for the yield of radiative deuteron capture from the ddμ state J=1 was obtained at a level of ηγ≤2×10−5 per one fusion.
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- 2002
154. [Untitled]
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S. K. Grishechkin, A. A. Kononenko, D. L. Demin, V. N. Lobanov, A. M. Demin, I. L. Malkov, S. A. Yukhimchuk, M. D. Vikharev, Yu. I. Vinogradov, V. V. Perevozchikov, V.G. Zinov, N. S. Ganchuk, A. A. Yukhimchuk, and A. N. Golubkov
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Automated data ,Materials science ,Volume (thermodynamics) ,Deuterium ,Impurity ,High pressure ,Analytical chemistry ,Nuclear fusion ,Refrigeration ,Instrumentation - Abstract
A design of the deuterium high-pressure target is presented. The target of a 76-cm3 volume is intended to study muon-catalyzed fusion reactions in ultrapure D2 (the concentration of impurities with Z > 1 is under 0.2 ppm) at temperatures of 80–800 K and up to 150-MPa pressures. The operation of the main target systems is described: the generation and purification of deuterium gas, refrigeration, heating, evacuation, control, and automated data acquisition. The target was used to determine the parameters of the muon-catalyzed fusion reactions in ultrapure D2 at temperatures of 300 to 800 K and pressures up to 150 MPa.
- Published
- 2002
155. Assessing the effect of low oxygen concentrations in gaseous hydrogen embrittlement of DIN 1.4301 and 1.1200 steels at high gas pressures
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Igor L. Malkov, Jörg Naumann, Igor E. Boitsov, Thorsten Michler, and Arkadiy A. Yukhimchuk
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Materials science ,Hydrogen ,General Chemical Engineering ,Metallurgy ,chemistry.chemical_element ,Context (language use) ,General Chemistry ,Partial pressure ,engineering.material ,Oxygen ,Orders of magnitude (specific energy) ,chemistry ,engineering ,General Materials Science ,Austenitic stainless steel ,Embrittlement ,Hydrogen embrittlement - Abstract
A high strength pearlitic-sorbitic steel (DIN 1.1200/K08500) and a metastable austenitic stainless steel (DIN 1.4301/AISI 304) were tensile tested in H2–O2 gas mixtures of high total gas pressures without any prior precharging and in inert environment after gaseous precharging in different H2–O2 gas mixtures. Tests at various total pressures revealed that the effect of oxygen to suppress hydrogen environment embrittlement is a function of oxygen partial pressure and not of total oxygen content. For steel 1.1200 tested at room temperature the threshold O2 partial pressure was 30–40 kPa whereas for steel 1.4301 tested at −50 °C a partial pressure of 160 kPa was not sufficient to influence embrittlement effects. Reviewing literature results in the context of this work revealed that threshold partial pressures vary by at least 3 orders of magnitude depending on steel grade and temperature. For tests in inert environment after gaseous precharging threshold O2 partial pressure was one order of magnitude lower compared to tests in H2–O2 gas mixtures.
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- 2012
156. Experimental study of nuclear fusion reactions in a ptμ system
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K. I. Gritsaj, A. I. Rudenko, Yu. I. Vinogradov, V. P. Volnykh, V. N. Duginov, A. D. Konin, L. N. Bogdanova, V. V. Filchenkov, A. A. Yukhimchuk, T. N. Mamedov, V. A. Stolupin, and D. L. Demin
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Nuclear physics ,Nuclear reaction ,Physics ,Nuclear and High Energy Physics ,Partial product ,Radiation ,Muon ,Nuclear fusion ,Radiology, Nuclear Medicine and imaging ,Measure (mathematics) ,Atomic and Molecular Physics, and Optics ,Catalysis - Abstract
By means of muon catalysis we study the phenomena in a pt-fusion, which have been previously investigated in the only experiment and now are at the frontier of nuclear few-body physics. The experiment is aimed at measuring the yields of the reaction products: γ-quanta, conversion muons and e + e − pairs. As a result we plan to measure the pt-fusion partial product yields (first time for e + e − pairs) with accuracy not worse than 10%, and this will enable us to obtain the nuclear reaction rates in M1 and E0 transitions in A = 4 system.
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- 2012
157. [Untitled]
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S. K. Grishechkin, I. L. Malkov, Yu. I. Vinogradov, A. A. Kononenko, V. N. Lobanov, S. A. Yukhimchuk, V.G. Zinov, N. S. Ganchuk, A. M. Demin, D. L. Demin, A. N. Golubkov, V. V. Perevozchikov, M. D. Vikharev, and A. A. Yukhimchuk
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Nuclear and High Energy Physics ,Fusion ,Muon-catalyzed fusion ,Muon ,Chemistry ,Radiochemistry ,Atmospheric temperature range ,Condensed Matter Physics ,Atomic and Molecular Physics, and Optics ,Nuclear physics ,Volume (thermodynamics) ,Deuterium ,High pressure ,Physical and Theoretical Chemistry - Abstract
The design of deuterium high-pressure target of 76 cm3 volume developed to study muon catalyzed fusion in diffusion-pure deuterium over an 80–800 K temperature range at up to 150 MPa pressure is presented.
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- 2001
158. [Untitled]
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A. I. Rudenko, A. N. Ponomarev, Victor R. Bom, J. N. Bradbury, V.Ya. Rozhkov, S. K. Grishechkin, V.G. Zinov, V. G. Klevtsov, A. M. Demin, D. L. Demin, A. N. Golubkov, J.D. Davies, K. I. Gritsaj, V. V. Perevozchikov, A.A. Kukolkin, N. N. Grafov, Yu. V. Smirenin, S. V. Medved, S. A. Yukhimchuk, A. D. Konin, S. V. Zlatoustovskii, A. A. Yukhimchuk, C.W.E. van Eijk, V. V. Filchenkov, V. A. Nazarov, V. G. Grebinnik, Nikolai Voropaev, and S. M. Sadetsky
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Nuclear and High Energy Physics ,Muon-catalyzed fusion ,Fusion ,Muon ,Hydrogen ,Isotope ,chemistry.chemical_element ,Atmospheric temperature range ,Condensed Matter Physics ,Atomic and Molecular Physics, and Optics ,chemistry ,Cycling rate ,Molecule ,Physical and Theoretical Chemistry ,Atomic physics - Abstract
Experiments on the study of the muon catalyzed fusion (μCF) process in a double D/T mixture of hydrogen isotopes in the temperature range 300–800 K at densities 0.3–0.5 LHD are performed at the JINR phasotron. The values of the effective μCF parameters (cycling rate λ c , neutron yield Y n , muon losses w) are obtained. Tentative dtμ-molecule formation rates on D2 and DT molecules (λ dtμ−d and λ dtμ−t ) are obtained for different mixture temperatures and densities. The results obtained show that λ dtμ−t increases with temperature, but its value is smaller than theoretical predictions.
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- 2001
159. [Untitled]
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D. L. Demin, Yu. A. Vinogradov, K. I. Gritsaj, J. N. Bradbury, S. V. Zlatoustovskii, V. V. Perevozchikov, A. D. Konin, Victor R. Bom, V. A. Nazarov, V.G. Zinov, V. G. Grebinnik, V. V. Filchenkov, N. N. Grafov, S. A. Yukhimchuk, A. A. Yukhimchuk, C.W.E. van Eijk, A. V. Kuryakin, S. M. Sadetsky, and A. I. Rudenko
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Nuclear and High Energy Physics ,Muon-catalyzed fusion ,Materials science ,Deuterium ,Molecule formation ,Physical and Theoretical Chemistry ,Atomic physics ,Atmospheric temperature range ,Condensed Matter Physics ,Formation rate ,Atomic and Molecular Physics, and Optics - Abstract
Muon catalyzed fusion in deuterium was studied by the MCF collaboration at JINR phasotron. The measurements were carried out with a high-pressure deuterium target at the JINR phasotron in the temperature range 300–800 K at densities ≃0.5 LHD. The first experimental results for ddμ-molecule formation rate λ ddμ in the temperature range 400–800 K with deuterium density 0.5 LHD are presented.
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- 2001
160. Measurement of quasi-isentropic compressibility of helium and deuterium at pressures of 1500–2000 GPa
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M. A. Mochalov, A. A. Yukhimchuk, E. A. Pronin, A. Yu. Baurin, R. I. Il’kaev, A. O. Blikov, A. V. Ryzhkov, Vladimir E. Fortov, V. A. Ogorodnikov, V. A. Arinin, A. L. Mikhailov, V. A. Komrakov, and Yu. M. Makarov
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Shock wave ,Materials science ,Deuterium ,chemistry ,Internal energy ,Ionization ,Compressibility ,General Physics and Astronomy ,chemistry.chemical_element ,Specific energy ,Plasma ,Atomic physics ,Helium - Abstract
The quasi-isentropic compressibility of helium and deuterium plasmas at pressures of up to 1500–2000 GPa has been measured using devices with spherical geometry and an X-ray diagnostic complex comprising three betatrons and a multichannel imaging system with electro-optic gamma detectors. A deuterium density of 4.5 g/cm3 and a helium density of 3.8 g/cm3 have been obtained at pressures of 2210 and 1580 GPa, respectively. The internal energy of a deuterium plasma at the indicated pressure is about 1 MJ/cm3, which is about 100 times greater than the specific energy of condensed chemical explosives. Analysis of the obtained data shows that the degree of helium ionization under the achieved plasma compression parameters is about 0.9.
- Published
- 2012
161. Measurement of the quasi-isentropic compressibility of a helium plasma at a pressure of about 5000 GPa
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A. O. Blikov, V. A. Ogorodnikov, R. I. Il’kaev, V. A. Komrakov, A. Yu. Baurin, A. V. Ryzhkov, M. A. Mochalov, A. A. Yukhimchuk, V. A. Arinin, Vladimir E. Fortov, and A. L. Mikhailov
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Diffraction ,Materials science ,Physics and Astronomy (miscellaneous) ,Solid-state physics ,chemistry.chemical_element ,Helium plasma ,Isentropic compressibility ,chemistry ,Physics::Plasma Physics ,Ionization ,Physics::Atomic and Molecular Clusters ,Compressibility ,Physics::Atomic Physics ,Atomic physics ,Helium - Abstract
The quasi-isentropic compressibility of a helium plasma has been measured using a spherical experimental chamber, as well as an X-ray diffraction complex consisting of three betatrons and a multichannel optoelectronic system for the detection of X-ray images. The density of the compressed helium plasma of about 8 g/cm3 has been obtained in the experiment at a pressure of 5000 GPa. Analysis of the data indicates that helium at the measured parameters is in a single ionized state.
- Published
- 2012
162. Radiogenic 3He and High-Pressure Hydrogen Impact on Mechanical Properties and Structure of CrNi40MoCuTiAl Alloy
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I. E. Boitsov, I. P. Maksimkin, I. L. Malkov, A. Yu. Baurin, A. A. Yukhimchuk, E. V. Shevnin, and S. K. Grishechkin
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Nuclear and High Energy Physics ,Radiogenic nuclide ,Materials science ,Hydrogen ,Mechanical Engineering ,Alloy ,chemistry.chemical_element ,Atmospheric temperature range ,engineering.material ,Plasticity ,Nuclear Energy and Engineering ,chemistry ,engineering ,High pressure hydrogen ,General Materials Science ,Tritium ,Composite material ,Elongation ,Civil and Structural Engineering - Abstract
The paper presents research results related to the impact of high-pressure hydrogen (80 MPa) and radiogenic 3He and their synergetic effect on mechanical properties and structure of CrNi40MoCuTiAl alloy within the temperature range from room temperature to 873K.The samples of three different 3He concentrations have been prepared for research: ≈ 30, ≈ 80 and ≈ 190 appm. The buildup of 3He has been fulfilled using «tritium trick» technique.The tests at room temperature have shown the increasing conventional yield strength (σ0.2) and decreasing plasticity characteristics (total elongation Δ5 and reduction of area E) depend on 3He concentration increasing. However at 873 К test temperature the alloy with the maximum 3He (≈ 190 appm) concentration turned out to be more plastic than the alloy with 3He ≈ 30 and 80 appm concentration.
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- 2011
163. Hydrogen Interaction with Nickel Containing Radiogenic Helium
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S. Kanashenko, S. K. Grishechkin, M. Glugla, Rion A. Causey, A. A. Kurdyumov, A. A. Yukhimchuk, T. N. Kompaniets, Ahmed Hassanein, E. A. Denisov, and I. L. Malkov
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Nuclear and High Energy Physics ,Radiogenic nuclide ,Materials science ,Hydrogen ,020209 energy ,Mechanical Engineering ,Inorganic chemistry ,chemistry.chemical_element ,02 engineering and technology ,01 natural sciences ,010305 fluids & plasmas ,Nickel ,Nuclear Energy and Engineering ,chemistry ,0103 physical sciences ,0202 electrical engineering, electronic engineering, information engineering ,General Materials Science ,Helium ,Civil and Structural Engineering - Published
- 2011
164. The 8He and 10He spectra studied in the (t,p) reaction
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Golovkov, M.S., Grigorenko, L.V., Ter-Akopian, G.M., Fomichev, A.S., Oganessian, Yu.Ts., Gorshkov, V.A., Krupko, S.A., Rodin, A.M., Sidorchuk, S.I., Slepnev, R.S., Stepantsov, S.V., Wolski, R., Pang, D.Y., Chudoba, V., Korsheninnikov, A.A., Kuzmin, E.A., Nikolskii, E.Yu., Novatskii, B.G., Stepanov, D.N., Roussel-Chomaz, P., Mittig, W., Ninane, A., Hanappe, F., Stuttgé, L., Yukhimchuk, A.A., Perevozchikov, V.V., Vinogradov, Yu.I., Grishechkin, S.K., and Zlatoustovskiy, S.V.
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Nuclear and High Energy Physics - Published
- 2009
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165. The 8He and 10He spectra studied in the (t,p) reaction
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Dan-Yang Pang, Alain Ninane, E. Yu. Nikolskii, W. Mittig, S. A. Krupko, B. G. Novatskii, S. K. Grishechkin, V. A. Gorshkov, R. S. Slepnev, A. A. Yukhimchuk, Yu. I. Vinogradov, A.A. Korsheninnikov, D. N. Stepanov, L. Stuttge, S. V. Zlatoustovskiy, V. V. Perevozchikov, E. A. Kuzmin, A. M. Rodin, G.M. Ter-Akopian, A. S. Fomichev, Yu. Ts. Oganessian, S. V. Stepantsov, F. Hanappe, S. I. Sidorchuk, M. S. Golovkov, V. Chudoba, R. Wolski, P. Roussel-Chomaz, and L. V. Grigorenko
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Physics ,Nuclear and High Energy Physics ,education.field_of_study ,010308 nuclear & particles physics ,Population ,01 natural sciences ,Spectral line ,Dipole ,Excited state ,0103 physical sciences ,Peak value ,Atomic physics ,Basso continuo ,010306 general physics ,Ground state ,education ,Excitation - Abstract
The low-lying spectra of 8He and 10He nuclei were studied in the 3H(6He, p)8He and 3H(8He, p)10He transfer reactions. The 0+ ground state (g.s.) of 8He and excited states, 2+ at 3.6–3.9 MeV and (1+) at 5.3–5.5 MeV, were populated with cross sections of 200, 100–250, and 90–125 μb/sr, respectively. Some evidence for a 8He state at about 7.5 MeV was obtained. We discuss a possible nature of the nearthreshold anomaly above 2.14 MeV in 8He and relate it to the population of a 1− continuum (soft dipole excitation) with a peak value at about 3 MeV. The lowest energy group of events in the 10He spectrum was observed at ∼ 3 MeV with a cross section of ∼ 140 μb/sr. We argue that this result is consistent with the previously reported observation of 10He providing the new 10He g.s. position at about 3 MeV
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- 2009
166. Hydrogen environment embrittlement testing at low temperatures and high pressures
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Arkadiy A. Yukhimchuk, Thorsten Michler, and Joerg Naumann
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Austenite ,Materials science ,Hydrogen ,General Chemical Engineering ,Metallurgy ,chemistry.chemical_element ,General Chemistry ,Strain rate ,chemistry ,Ultimate tensile strength ,General Materials Science ,Embrittlement ,Chemical composition ,Hydrogen embrittlement ,Tensile testing - Abstract
Hydrogen environment embrittlement (HEE) of several heats of austenitic stainless steels was measured by slow strain rate tensile testing in hydrogen atmosphere at different temperature–pressure combinations. The relative reduction of area decreased (means increasing hydrogen embrittlement) in the following order: 20 °C/10 bar > 20 °C/700 bar > −50 °C/10 bar > −50 °C/400 bar ≈ −80 °C/200 bar. An assessment of the most severe error sources revealed that tensile tests in hydrogen can be performed with a very high repeatability and reproducibility with a total deviation of about 10% with respect to the relative reduction of area (RRA = RA H2 /RA He ). Higher deviations in RRA are due to local deviations in metallurgy and chemical composition, which are very sensitive to HEE. Screening tests of several austenitic SS at 20 °C/700 bar show decreasing HEE with increasing Ni content. For RRA > 90%, a minimum Ni content of >11.5 wt% is required.
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- 2008
167. Effect of Radiogenic Helium on Stainless Steel 12Cr18Ni10Ti Mechanical Properties and Hydrogen Permeability
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S. K. Grishechkin, I. L. Malkov, I. Boitsov, A. A. Yukhimchuk, E. A. Denisov, A. A. Kurdyumov, Ahmed Hassanein, B. S. Lebedev, Rion A. Causey, S. Kanashenko, T. N. Kompaniets, and M. Glugla
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Nuclear and High Energy Physics ,Radiogenic nuclide ,Materials science ,genetic structures ,Hydrogen ,Mechanical Engineering ,fungi ,Kinetics ,technology, industry, and agriculture ,chemistry.chemical_element ,respiratory system ,Plasticity ,respiratory tract diseases ,Nuclear Energy and Engineering ,chemistry ,Permeability (electromagnetism) ,Helium-3 ,General Materials Science ,Composite material ,Embrittlement ,Helium ,Civil and Structural Engineering - Abstract
Samples of stainless steel 12Cr18Ni10Ti with radiogenic helium were subjected to mechanical tests with a constant extension rate. The presence of {sup 3}He does not markedly affect the strength characteristic, but significantly decreases plasticity of steel. The presence of hydrogen enhances the embrittlement of steel, containing {sup 3}He. The diffusion coefficient of hydrogen does not change significantly in the presence of helium, but the traps for hydrogen, which occur due to the presence of helium, delay the kinetics of a steady state flux onset at helium concentration of 50 appm. (authors)
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- 2008
168. RFNC-VNIIEF Experience in Development and Operation of Hydrogen Isotopes Gas-Handling Systems for Basic Research
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R. I. Il'kaev and A. A. Yukhimchuk
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Nuclear and High Energy Physics ,Hydrogen ,020209 energy ,Mechanical Engineering ,Semiconductor materials ,Nuclear engineering ,chemistry.chemical_element ,Scientific experiment ,02 engineering and technology ,01 natural sciences ,010305 fluids & plasmas ,Development (topology) ,Nuclear Energy and Engineering ,chemistry ,Basic research ,0103 physical sciences ,Fundamental physics ,0202 electrical engineering, electronic engineering, information engineering ,Key (cryptography) ,General Materials Science ,Civil and Structural Engineering - Abstract
Application of hydrogen isotopes in different fields of fundamental physics obtained by RFNC-VNIIEF in the last decade are presented. Gas-handling systems for scientific experiments, some technologies and designs of the setup key elements are described, and results obtained with the developed equipment are outlined. (authors)
- Published
- 2008
169. PRODUCTION OF RADON ISOTOPES IN THE REACTIONS 48Ca + 242Pu AND 48Ca + 208Pb ON MASS SEPARATOR MASHA
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Rodin, A. M., primary, Belozerov, A. V., additional, Chernysheva, E. V., additional, Dmitriev, S. N., additional, Gulyaev, A. V., additional, Gulyaeva, A. V., additional, Komarov, A. B., additional, Novoselov, A. S., additional, Podshibyakin, A. V., additional, Salamatin, S., additional, Stepantsov, S. V., additional, Vedeneev, V. Yu., additional, Yukhimchuk, S. A., additional, Krupa, L., additional, Granja, C., additional, Pospisil, S., additional, Holik, M., additional, Kliman, J., additional, Motycak, S., additional, and Kamas, D., additional
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- 2017
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170. Effect of radiogenic 3He and hydrogen on the mechanical properties and structure of 12Kh18N10T steel
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M. J. Glugla, S. K. Grishechkin, Ahmed Hassanein, I. E. Boitsov, S. Kanashenko, A. A. Yukhimchuk, and Rion A. Causey
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Radiogenic nuclide ,Materials science ,Structural material ,Hydrogen ,Mechanical Engineering ,Metallurgy ,chemistry.chemical_element ,Atmospheric temperature range ,Condensed Matter Physics ,chemistry ,Mechanics of Materials ,Ultimate tensile strength ,Hardening (metallurgy) ,General Materials Science ,Embrittlement ,Helium - Abstract
We present some results of studying the influence of high-pressure hydrogen (80 MPa), radiogenic 3He (with concentrations up to 130 appm), and their joint action on the mechanical properties and structure of 12Kh18N10T steel in the temperature range from 293 to 873 K. We describe the procedure of tests of specimens containing 3He. It has been established that the joint action of hydrogen and 3He affects slightly the ultimate strength of the specimens. Saturation of steel with radiogenic 3He by the method of “tritium trick” increases its yield strength. Hardening of the steel caused by helium increases with temperature and 3He concentration and, at 873 K, is accompanied by substantial embrittlement. We also present results of the fractographic analysis of specimens tested under different conditions.
- Published
- 2007
171. USING MASHA+TIMEPIX SETUP FOR REGISTRATION BETA DECAY ISOTOPES PRODUCED IN HEAVY ION INDUCED REACTIONS
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A. V. Gulyaev, Stanislav Pospisil, A. V. Gulyaeva, Yu. Ts. Oganessian, V. Yu. Vedeneev, S. V. Stepantsov, A. S. Novoselov, V. S. Salamatin, E. V. Chernysheva, S. Motycak, A. V. Belozerov, S. A. Yukhimchuk, I. Sivacek, A. M. Rodin, C. Granja, M. G. Itkis, J. Kliman, L. Krupa, and S. N. Dmitriev
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Physics ,Nuclear physics ,Isotope ,Radiochemistry ,Heavy ion ,Beta decay - Published
- 2015
172. THE MEASUREMENT OF THE EVAPORATION RESIDUES EXCITATION FUNCTIONS IN THE FUSION REACTIONS 144Sm (40Ar,xn) AND 166Er(40Ar,xn)
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A. V. Belozerov, A. V. Gulyaev, E. V. Chernysheva, V. S. Salamatin, I. Sivacek, S. V. Stepantsov, Yu. Ts. Oganessian, S. Motycak, A. V. Gulyaeva, A. S. Novoselov, M. G. Itkis, J. Kliman, S. N. Dmitriev, L. Krupa, V. Yu. Vedeneev, S. A. Yukhimchuk, and A. M. Rodin
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Materials science ,Evaporation ,Physical chemistry ,Nuclear fusion ,Excitation - Published
- 2015
173. Integration of hidden markov models in the automated speaker recognition system for critical use.
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KOVTUN, Vjatcheslav V., YUKHIMCHUK, Maria S., KISAŁA, Piotr, ABISHEVA, Akmaral, and RAKHMETULLINA, Saule
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HIDDEN Markov models ,MARKOV processes ,SPEECH processing systems ,PATTERN perception ,CONCEPTION - Abstract
Copyright of Przegląd Elektrotechniczny is the property of Przeglad Elektrotechniczny and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2019
- Full Text
- View/download PDF
174. ANALYSIS OF THE AUTOMATED SPEAKER RECOGNITION SYSTEM OF CRITICAL USE OPERATION RESULTS.
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Bisikalo, O. V., Kovtun, V. V., Yukhimchuk, M. S., and Voytyuk, I. F.
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STATISTICAL learning ,CONFIGURATION space ,OBJECT recognition (Computer vision) ,HILBERT-Huang transform ,RISK-taking behavior ,OPERATIONAL risk - Abstract
Copyright of Radio Electronics, Computer Science, Control is the property of Zaporizhzhia National Technical University and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2018
- Full Text
- View/download PDF
175. Gas Feeding System Supplying the U-400M Cyclotron Ion Source with Hydrogen Isotopes
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V. V. Angilopov, Yu. I. Vinogradov, N. Yu. Yazvitski, Sergey Bogomolov, V. G. Klevtsov, A. A. Yukhimchuk, Yu. Ts. Oganessian, G. G. Gulbekian, Ye. V. Gornostaev, A. N. Golubkov, A. A. Yefremov, S. V. Zlatoustovski, S. V. Filchagin, A. V. Kuryakin, Yu. I. Smirnov, S. V. Pashchenko, Vladimir Loginov, V. I. Pustovoi, M. Leporis, I. N. Malkov, G. M. Ter-Akopian, A. M. Rodin, R. K. Musyaev, V. V. Bekhterev, A. M. Demin, A. Zelenak, V. A. Apasov, and S. K. Grishechkin
- Subjects
Nuclear and High Energy Physics ,Materials science ,Hydrogen ,020209 energy ,Cyclotron ,Analytical chemistry ,chemistry.chemical_element ,02 engineering and technology ,01 natural sciences ,010305 fluids & plasmas ,Ion ,law.invention ,chemistry.chemical_compound ,law ,0103 physical sciences ,0202 electrical engineering, electronic engineering, information engineering ,General Materials Science ,Hydrogen deuteride ,Civil and Structural Engineering ,Heavy water ,Mechanical Engineering ,Ion source ,Nuclear Energy and Engineering ,chemistry ,Tritium ,Atomic physics ,Beam (structure) - Abstract
Automated system feeding into ion source hydrogen isotopes as molecules with preset ratio of the fluxes is described. The control system automatically maintained the working parameters and provided graphic and digital representation of the controlled processes. Theradio-frequency (RF) ion source installed at the axial injection line of the cyclotron produced ion beams of HD + , HT + , DT + , D 2 H + , etc. At a several months DT + beam acceleration the tritium consumption was less than 108 Bq/hr. The intensity of a 58.2 MeV triton beam (T + ions) extracted from the cyclotron chamber was about 10 nA.
- Published
- 2005
176. Modeling of the Tritium Impact on Mechanical Properties of Structural Materials by Radiogenic Helium and Hydrogen Synergetic Effect Technique
- Author
-
A. A. Yukhimchuk, I. E. Boitsov, S. V. Zlatoustovskiy, and S. K. Grishechkin
- Subjects
Nuclear and High Energy Physics ,Structural material ,Radiogenic nuclide ,Materials science ,Hydrogen ,020209 energy ,Mechanical Engineering ,Thermodynamics ,chemistry.chemical_element ,Titanium alloy ,02 engineering and technology ,01 natural sciences ,010305 fluids & plasmas ,Nuclear Energy and Engineering ,chemistry ,Helium-3 ,0103 physical sciences ,0202 electrical engineering, electronic engineering, information engineering ,General Materials Science ,Material properties ,Helium ,Civil and Structural Engineering ,Hydrogen embrittlement - Abstract
The paper presents results of tritium-structural materials interaction modeling by simultaneous exposure to radiogenic helium-3 and hydrogen (both dissolved and external). This method of synergetic effect of radiogenic helium-3 and hydrogen is a radiation-safe technique to study the tritium impact on mechanical properties of structural materials. Applicability of the method is illustrated by technique and research results on the impact of high-pressure hydrogen (80MPa), helium-3 (concentration ∼140appm) and their synergetic (hydrogen+ 3 He) effecs on mechanical properties of CrNi40MoCuTiAl alloy in temperature range from 20 to 600°C. It has been shown that joint effect of radiogenic helium-3 and hydrogen on mechanical properties of alloy can not be represented as the result of a simple summation of helium and hydrogen embrittlement. Proposed technique of synergetic impact of radiogenic helium-3 and hydrogen allows more correct simulation and investigation in the tritium impact on mechanical properties of materials than individual research in helium or hydrogen embrittlement.
- Published
- 2005
177. Measurement and Control Systems of Tritium Facilities for Scientific Research
- Author
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A. V. Kuryakin, Yu. I. Vinogradov, and A. A. Yukhimchuk
- Subjects
Nuclear and High Energy Physics ,Materials science ,Hydrogen ,020209 energy ,Nuclear Theory ,chemistry.chemical_element ,02 engineering and technology ,01 natural sciences ,010305 fluids & plasmas ,Nuclear physics ,0103 physical sciences ,0202 electrical engineering, electronic engineering, information engineering ,General Materials Science ,Neutron ,Nuclear Experiment ,Helium ,Civil and Structural Engineering ,Muon-catalyzed fusion ,Mechanical Engineering ,Temperature and pressure ,Nuclear Energy and Engineering ,Deuterium ,chemistry ,Control system ,Physics::Accelerator Physics ,Tritium - Abstract
The technical approach, equipment and software developed during the creation of measurement and control systems for two complexes are described. The first one is a complex that prepares the gas mixture and targets of the 'TRITON' facility. The 'TRITON' facility is designed for studying muon catalyzed fusion reactions in triple mixtures of H/D/T hydrogen isotopes over wide ranges of temperature and pressure. The second one is 'ACCULINNA' - the liquid tritium target designed to investigate the neutron overloaded hydrogen and helium nuclei. These neutron-overloaded nuclei are produced in reactions of tritium beams on a heavy hydrogen and tritium target.
- Published
- 2005
178. Status of Works on A-40-MCI-Activity Tritium Source for the Measurement of the Antineutrino Magnetic Moment
- Author
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R. I. Il’kaev, L. N. Bogdanova, S. K. Grishechkin, D. P. Tumkin, A. V. Kuryakin, A. N. Golubkov, V. N. Lobanov, B. L. Lebedev, A. A. Yukhimchuk, V. N. Mikhailov, and Yu. I. Vinogradov
- Subjects
Physics ,Nuclear and High Energy Physics ,Hollow cylinder ,Magnetic moment ,020209 energy ,Mechanical Engineering ,Detector ,02 engineering and technology ,Radiation ,01 natural sciences ,Beta decay ,010305 fluids & plasmas ,Nuclear physics ,Nuclear Energy and Engineering ,0103 physical sciences ,0202 electrical engineering, electronic engineering, information engineering ,General Materials Science ,Tritium ,Electron neutrino ,Civil and Structural Engineering - Abstract
For the experiment on the measurement of the electron antineutrino magnetic moment we suggest a new approach to the tritium source design, namely, a configuration of annular cells filled with TiT{sub 2} that are stacked into a hollow cylinder. Detectors are mounted in the hole inside.We present results of the optimization of geometrical and physical parameters of the source with respect to its experimental effectiveness and safety guaranty at all stages of its lifecycle. We discuss the choice of the construction materials and specify technological issues relevant to radiation purity of the source, being of the special concern in the experiment on the electron antineutrino magnetic moment measurement.
- Published
- 2005
179. Tritium Superpermeability: Experimental Investigation and Simulation of Tritium Recirculation in 'Prometheus' Setup
- Author
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A.A Busnyuk, S. K. Grishechkin, B. S. Lebedev, M. E. Notkin, R. K. Musyaev, A. A. Yukhimchuk, A.A. Samartsev, and A.I. Livshits
- Subjects
Nuclear and High Energy Physics ,Hydrogen ,020209 energy ,Mechanical Engineering ,Nuclear engineering ,chemistry.chemical_element ,02 engineering and technology ,Cryopump ,Fusion power ,01 natural sciences ,010305 fluids & plasmas ,Isotope separation ,law.invention ,Nuclear physics ,Nuclear Energy and Engineering ,chemistry ,law ,0103 physical sciences ,0202 electrical engineering, electronic engineering, information engineering ,Environmental science ,General Materials Science ,Tritium ,Helium ,Civil and Structural Engineering - Abstract
The superpermeability phenomenon was suggested to use in fusion machines to separate the fuel mixture from helium ashes, to arrange in-vessel fuel recirculation contours and effective evacuation of...
- Published
- 2005
180. Calculated and Experimental Study of Metal Saturation with Helium-3
- Author
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S. V. Zlatoustovskiy, I. L. Malkov, and A. A. Yukhimchuk
- Subjects
Nuclear and High Energy Physics ,Materials science ,Hydrogen ,020209 energy ,Alloy steel ,Analytical chemistry ,chemistry.chemical_element ,02 engineering and technology ,engineering.material ,01 natural sciences ,010305 fluids & plasmas ,Metal ,Helium-3 ,0103 physical sciences ,0202 electrical engineering, electronic engineering, information engineering ,General Materials Science ,Solubility ,Isotopes of helium ,Civil and Structural Engineering ,Stable isotope ratio ,Mechanical Engineering ,Nuclear Energy and Engineering ,chemistry ,visual_art ,engineering ,visual_art.visual_art_medium ,Saturation (chemistry) - Abstract
The results of calculated and experimental studies of the influence of some parameters (the temperature and time of tritiation and aging, the cooling rate after tritiation) on the helium-3 concentration in metals are given. It has been experimentally found that the hydrogen concentration in O3 mm samples of 12Cr18Ni10Ti steel, which were saturated with hydrogen at 773 K and 50 MPa, makes up ∼ 0.6 of the equilibrium hydrogen concentration immediately after cooling to room temperature and ∼ 0.5 after 5000-hour aging.
- Published
- 2005
181. Experimental measurements of the compressibility, temperature, and light absorption in dense shock-compressed gaseous deuterium
- Author
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M. A. Mochalov, V. V. Khrustalev, S. F. Manachkin, S. I. Kirshanov, Vladimir E. Fortov, A. B. Mezhevov, A. N. Shuikin, I. L. Iosilevskii, V. K. Gryaznov, A. L. Mikhailov, S. K. Gruzdev, Mikhail Zhernokletov, G. N. Kashintseva, V. B. Mintsev, R. I. Il’kaev, A. A. Yukhimchuk, and S. K. Grishechkin
- Subjects
Pressure range ,Liquid state ,Materials science ,Physics and Astronomy (miscellaneous) ,Deuterium ,Solid-state physics ,Astrophysics::High Energy Astrophysical Phenomena ,Compressibility ,Thermodynamics ,Molar absorptivity ,Compression (physics) ,Shock (mechanics) - Abstract
Experimental data on the shock compression, temperature, and absorptivity of gaseous deuterium with an initial density close to its value in the liquid state were obtained on a spherical explosion shock-wave generator in a pressure range of 80–90 GPa. The obtained results are compared with the existing experimental and theoretical data.
- Published
- 2004
182. A Computerized Monitoring and Control System for the Gas-Mixture Preparation Complex for Experiments on Muon-Catalyzed Fusion
- Author
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A. A. Yukhimchuk, V. A. Kuryakin, S. V. Filchagin, Yu. I. Vinogradov, V. S. Aryutkin, and V.V. Travkin
- Subjects
Muon-catalyzed fusion ,Fusion ,Reliability (semiconductor) ,Temperature and pressure ,Hydrogen ,chemistry ,Control system ,Nuclear engineering ,Radiation monitoring ,chemistry.chemical_element ,Instrumentation ,Monitoring and control - Abstract
A computerized system for monitoring and controlling the gas-mixture preparation complex of the TRITON installation is described. The installation is designed for experimental investigations of muon-catalyzed fusion in triple mixtures of hydrogen isotopes H/D/T over wide ranges of temperature and pressure. The system is used to control the entire complex of gas-mixture preparation, the target parameters, and the gas-mixture composition, as well as to carry out radiation monitoring. Good performance characteristics, the high reliability of the system, and the possibility of its rapid adaptation to new tasks have been demonstrated in physics experiments.
- Published
- 2004
183. Measurement and Control Systems for Investigations with Mixtures of Hydrogen Isotopes
- Author
-
A. A. Yukhimchuk, V. T. Punin, and Yu. I. Vinogradov
- Subjects
Materials science ,Temperature and pressure ,Isotope ,Hydrogen ,chemistry ,Instrumentation ,Analytical chemistry ,Nuclear fusion ,chemistry.chemical_element ,Tritium ,Catalysis - Abstract
Measurement and control systems of two instrumentation complexes for experimental studies using hydrogen isotopes are described. The first of these, the complex that prepares the gas mixture of the Triton facility, is designed for studying the muonic catalysis of nuclear fusion reactions in triple mixtures of H/D/T hydrogen isotopes over wide ranges of temperature and pressure. The second, the Prometheus complex, is designed for studying the phenomena of tritium accumulation and transmission by metals and other structural materials.
- Published
- 2004
184. Nature of visible luminescence of co-sputtered Si–SiOx systems
- Author
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Tetyana Torchynska, J. Jedrzejewski, Larysa Khomenkova, N. Korsunska, F.G. Becerril Espinoza, V. Yukhimchuk, E. Savir, and Y. Goldstein
- Subjects
Materials science ,Photoluminescence ,business.industry ,Analytical chemistry ,Condensed Matter Physics ,Spectral line ,Electronic, Optical and Magnetic Materials ,Raman scattering spectra ,Optics ,Thermal ,Radiative transfer ,Electrical and Electronic Engineering ,Radio frequency magnetron sputtering ,Luminescence ,business - Abstract
Photoluminescence (PL) spectra and Raman scattering spectra of Si–SiO x systems, prepared by radio frequency magnetron sputtering method and thermal annealed at 1150°C for creation of Si nano-crystallites, were investigated as a function of Si content and Si nano-crystallite sizes. It was shown that the PL spectrum of such systems consists of several bands with peak positions at 1.32–1.34, 1.42–1.58, 1.77, 2.05 and 2.30 eV. The dependencies of these PL band parameters on concentration and size of Si nano-crystallites in the Si–SiO x system have been investigated and analyzed. The nature of radiative optical transitions for all PL bands is discussed.
- Published
- 2003
185. Tritium target for research in exotic neutron-excess nuclei
- Author
-
A. M. Demin, S. V. Stepantsov, Yu. I. Vinogradov, R. S. Slepnev, M. D. Vikharev, G.M. Ter-Akopian, V.V. Travkin, V.A. Klisch, A.A. Kukolkin, M. S. Golovkov, V. S. Aryutkin, A. V. Kuryakin, V. A. Safronov, A. N. Golubkov, S.S. Matveev, S. I. Sidorchuk, N. S. Ganchuk, Yu. Ts. Oganessian, V. N. Lobanov, S. V. Zlatoustovskiy, A. A. Yukhimchuk, I. L. Malkov, R. Wolski, S. V. Filchagin, D. D. Bogdanov, V.M. Solyankin, V. V. Perevozchikov, A. M. Rodin, A. S. Fomichev, V.Ya. Rozhkov, G.I. Karyakin, S. K. Grishechkin, V. A. Apasov, A. A. Kononenko, and D. P. Tumkin
- Subjects
Physics ,Nuclear physics ,Elastic scattering ,Nuclear and High Energy Physics ,Angular range ,Radiation monitoring ,Neutron ,Tritium ,Atomic physics ,Instrumentation ,Intensity (heat transfer) ,Beam (structure) - Abstract
A cryogenic tritium target and computer-controlled equipment providing for feeding/recovering tritium into/from the target cell and radiation monitoring in technological lines and in workrooms is described. The tritium target set-up showed reliable operation in experiments done with a 58.3 MeV triton beam focused on a 5 mm spot at intensity approaching 3×107 s−1. The t+t elastic scattering cross-section was obtained in a wide angular range.
- Published
- 2003
186. Nature of visible luminescence and its excitation in Si–SiO systems
- Author
-
V. Yukhimchuk, A. Many, E. Savir, J. Jedrzejewski, B. Jumayev, Nadiia Korsunska, A. Vivas Hernandez, Tetyana Torchynska, Y. Goldstein, and Larysa Khomenkova
- Subjects
Photoluminescence ,Silicon ,Chemistry ,Biophysics ,Analytical chemistry ,chemistry.chemical_element ,General Chemistry ,Sputter deposition ,Condensed Matter Physics ,Biochemistry ,Molecular physics ,Atomic and Molecular Physics, and Optics ,symbols.namesake ,symbols ,Photoluminescence excitation ,Luminescence ,Raman spectroscopy ,Silicon oxide ,Excitation - Abstract
Photoluminescence (PL) spectra and their temperature dependence, as well as PL excitation and Raman spectra of Si–SiO x systems prepared by RF magnetron sputtering were investigated as a function of Si content. It was shown that PL spectrum of such systems consists of several bands. The correlation of shift of peak position of the lower-energy band from 1.38 to 1.54 eV with the change of size of Si nanocrystallites from 5 to 2.7 nm was observed. It was assumed that this PL band is connected with carrier recombination inside Si nanoparticles or with radiative transitions between a Si band and an interface level. It was shown that peak positions of the other observed bands (at 1.7, 2.06 and 2.32 eV) do not depend on the sizes of Si nanocrystallites. It was suggested that they are connected with silicon oxide defects based on the increase of intensities of these bands with increasing silicon oxide content. It was also shown that the excitation of PL is mainly due to light absorption in silicon nanocrystallites. Participation of hot carriers in excitation of defect-related bands was assumed.
- Published
- 2003
187. Status of ACCULINNA beam line
- Author
-
A. A. Yukhimchuk, S. V. Zlatoustovskiy, S. V. Filchagin, D. D. Bogdanov, Yu. I. Vinogradov, Yu. Ts. Oganessian, A. V. Kuryakin, M. S. Golovkov, S. K. Grishechkin, R. Wolski, A. M. Rodin, A. S. Fomichev, R. I. Il’kaev, A. M. Demin, R. S. Slepnev, S. I. Sidorchuk, G. M. Ter-Akopian, S. V. Stepantsov, and V. V. Perevozchikov
- Subjects
Nuclear physics ,Radioactive ion beams ,Nuclear and High Energy Physics ,Beamline ,Chemistry ,Radiochemistry ,NAND gate ,Instrumentation - Abstract
TheseparatorACCULINNAwasupgradedtoachievenewexperimentalrequirements.Thebeamlinewasextendedbynewion-opticalelementsbeyondthecyclotronhall.Thenewarrangementsyieldmuchbetterbackgroundcondi-tions.Theintensitiesof 6 Heand 8 Heradioactivebeamsproducedinfragmentationof35AMeV 11 Bionswereincreaseduptoafactorof10.Theupgradedbeamlinewasusedinexperimentstostudythe 5 Hresonancestatespopulatedinthet þt reaction.Acryogenicliquidtritiumtargetwasdesignedandinstalledattheseparatorbeamline. 2002ElsevierScienceB.V.Allrightsreserved. PACS:25.70.Mn;29.25.RmKeywords:Radioactive ion beams;Productiontarget;Profileddegrader;Liquidtritiumtarget 1.IntroductionTheseparatorACCULINNA[1]isinoperationsince1996.Highintensityprimarybeamsof 7 Li, 11 B, 13 C, 15 Nand 18 Owithenergyvaluesrangingbetween32and50AMeVaredeliveredbytheU-400Mcyclotrontotheproductiontargetoftheseparator.Thesecondarybeamsof 6 Heand 8 Henucleiwithenergiesofabout25AMeVallowedustogainnewinsightsintothestructureofneutronhalonucleithroughthestudyofone-andtwo-neutrontransferreactionsmadewithhydrogenandheliumtargets[2–5].Suchbeamsofferfavor-ableconditionsfortheproductionofsofarun-knownparticle-unstablenucleibeyondtheneutrondripline.Forthispurposeonecoulduseone-stepone-proton and two-neutron transfer reactionsoccurringwheneither
- Published
- 2003
188. The influence of carbon on the properties of Si/SiGe heterostructures
- Author
-
L. A. Matveeva, V. A. Yukhimchuk, A. S. Oberemok, V. N. Dzhagan, M. Ya. Valakh, and B. N. Romanyuk
- Subjects
Materials science ,Physics::Instrumentation and Detectors ,Annealing (metallurgy) ,Doping ,Analytical chemistry ,Heterojunction ,Plasma ,Condensed Matter::Mesoscopic Systems and Quantum Hall Effect ,Condensed Matter Physics ,Mass spectrometry ,Atomic and Molecular Physics, and Optics ,Spectral line ,Computer Science::Other ,Electronic, Optical and Magnetic Materials ,symbols.namesake ,symbols ,Stress relaxation ,Condensed Matter::Strongly Correlated Electrons ,Raman spectroscopy - Abstract
Si/SiGe/SiGe:C/SiGe/Si heterostructures are investigated by Raman spectroscopy, electroreflectance method, and secondary-neutral mass spectrometry. It is shown that doping of a SiGe layer lying between undoped SiGe layers with C (1.5%) leads to almost complete stress relaxation in the doped layer. It is found that high-temperature photon annealing is responsible for a partial stress relaxation in the lower SiGe buffer layer. However, such annealing increases the Si content in this layer. Low-temperature treatment in the radio-frequency (RF) hydrogen plasma leads to considerable stress relaxation in the lower buffer layer without varying its composition. The results obtained from the electroreflectance and secondary-neutral-mall spectra correlate with the Raman spectroscopy data.
- Published
- 2003
189. Defect-related luminescence of Si/SiO2layers
- Author
-
Tetyana Torchynska, Larysa Khomenkova, A. Many, Y. Goldstein, E. Savir, V. Yukhimchuk, Nadiia Korsunska, B. Jumayev, and J. Jedrzejewski
- Subjects
Photoluminescence ,Materials science ,Silicon ,Analytical chemistry ,chemistry.chemical_element ,Nanoparticle ,Mineralogy ,Condensed Matter Physics ,symbols.namesake ,chemistry ,Sputtering ,symbols ,General Materials Science ,Photoluminescence excitation ,Raman spectroscopy ,Luminescence ,Excitation - Abstract
Photoluminescence (PL), photoluminescence excitation (PLE), and Raman spectra of Si–SiOx layers were measured as a function of Si content. Samples were prepared by co-sputtering of Si and SiO2 and post-annealing. The average size of Si nanoparticles was estimated from Raman measurements. It was shown that, in general, the PL spectra consist of two bands with maxima in the 'red' and 'green' spectral ranges. The 'red' PL band is complex and contains two (IR and red (R)) components. The shift of the peak position of the IR component from 1.38 to 1.54 eV correlates with the decrease of the Si nanoparticle size from 5 to 2.7 nm. It was shown that this PL component could be ascribed to carrier recombination in silicon nanoparticles. The R component of the 'red' band as well as the 'green' band have similar dependences of the peak positions and intensities on the Si content and can be ascribed to defect-related luminescence. It was concluded that the light absorption in silicon nanocrystallites plays the main role in PLE process. Hot-carrier participation in the excitation of defect-related bands was deduced.
- Published
- 2002
190. Tritium Fuel Cycle for Muon-Catalyzed Intense Neutron Source (MC INS)
- Author
-
A. A. Yukhimchuk and Vladimyr A. Arkhangel'sky
- Subjects
Nuclear and High Energy Physics ,Muon-catalyzed fusion ,Muon ,Materials science ,business.industry ,Mechanical Engineering ,Schematic ,Fusion power ,Nuclear physics ,Nuclear Energy and Engineering ,Neutron source ,General Materials Science ,Neutron ,Tritium ,business ,Thermal energy ,Civil and Structural Engineering - Abstract
This paper presents a schematic design of Tritium Fuel Cycle for Muon-Catalyzed Intense Neutron Source (MC INS) capable of producing monochromatic 14 MeV neutrons. Based on the assumption that the fuel mixture should be used in a liquid phase the different approaches arc proposed to incorporate a DT cell (synthesizer) into the MC INS facility The estimations of total tritium inventory in the MC INS facility are given The calculations of the DT cell operation temperature regime using the code FLOW 3D are presented. It is shown the capability to remove the thermal energy released in the DT cell of the proposed design. The MC INS design is analyzed from the viewpoint of tritium safety requirements.
- Published
- 2002
191. Tritium Activities in Russia
- Author
-
A. A. Yukhimchuk
- Subjects
Nuclear and High Energy Physics ,Materials science ,020209 energy ,Mechanical Engineering ,Nuclear engineering ,02 engineering and technology ,01 natural sciences ,010305 fluids & plasmas ,Nuclear Energy and Engineering ,0103 physical sciences ,0202 electrical engineering, electronic engineering, information engineering ,General Materials Science ,Tritium ,Civil and Structural Engineering - Published
- 2002
192. Status of an experiment aimed at laboratory searches for the electron-antineutrino magnetic moment at a level of μ ν ≤3±10− μ B
- Author
-
B. S. Neganov, A. G. Beda, A. S. Starostin, L. N. Bogdanova, V. N. Trofimov, and A. A. Yukhimchuk
- Subjects
Nuclear physics ,Physics ,Nuclear and High Energy Physics ,Magnetic moment ,Scattering ,Electric field ,Detector ,Electron ,Neutrino ,Electron neutrino ,Atomic and Molecular Physics, and Optics ,Semiconductor detector - Abstract
An experiment aimed at directly detecting antineutrino-electron scattering by using a 40-MCi tritium β-active source will make it possible to lower the present-day laboratory limit on the neutrino magnetic moment by two orders of magnitude. The experiment brings together novel unique technologies in studying rare processes of neutrino-electron scattering: (i) an artificial source of antineutrinos from tritium decay of 40-MCi activity with the antineutrino flux density of about 6×1014 cm−2 s−1 and (ii) new types of detectors capable of detecting electrons of energy down to about 10 eV, namely, a silicon cryogenic detector based on the ionization-into-heat conversion effect and a high-pure germanium detector with an internal signal amplification in the electric field. A compact installation located at a specially equipped underground laboratory (≤100 mwe) will provide favorable background conditions for running the experiment. With a background level of about 0.1 event/(kg keV d) and detector assembly masses of 3 and 5 kg for the silicon and germanium ones, respectively, a limit of μ ν ≤3±10− μ B on the electron-antineutrino magnetic moment will be obtained within 1 to 2 years of data acquisition. The status of the experiment and the state of the art are presented.
- Published
- 2001
193. Structural transformations and silicon nanocrystallite formation in SiOx films
- Author
-
V.Ya. Bratus, V. A. Yukhimchuk, M. Ya. Valakh, I. Z. Indutnyi, P. E. Shepeliavyi, L. I. Berezhinsky, Igor Vorona, I.B. Yanchuk, and T.T. Petrenko
- Subjects
Photoluminescence ,Materials science ,Silicon ,Annealing (metallurgy) ,Analytical chemistry ,chemistry.chemical_element ,Atmospheric temperature range ,Condensed Matter Physics ,Evaporation (deposition) ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,law.invention ,Amorphous solid ,symbols.namesake ,Nuclear magnetic resonance ,chemistry ,law ,symbols ,Electron paramagnetic resonance ,Raman scattering - Abstract
The results of a comprehensive study by the methods of IR absorption, Raman scattering, photoluminescence (PL), and electron spin resonance (ESR) of SiOx films prepared by thermal evaporation of SiO in a vacuum are presented. The nature of structural transformations occurring on annealing the films is determined. Annealing in the temperature range 300–600°C gives rise to a PL band at 650 nm, presumably related to structural defects in SiOx film. Raising the annealing temperature further leads to healing of such defects and quenching of the PL band. Silicon precipitates pass from the amorphous to the crystalline state on being annealed at Tann=1100°C, which gives rise to a new PL band at 730 nm. ESR spectra of Pb centers were recorded at the interface between randomly oriented silicon nanocrystallites and SiO2.
- Published
- 2001
194. System for investigation of hydrogen isotopes — solid body interaction at 500 MPa
- Author
-
S. K. Grishechkin, A. A. Yukhimchuk, and A. N. Golubkov
- Subjects
Hydrogen ,Isotope ,Renewable Energy, Sustainability and the Environment ,Analytical chemistry ,Energy Engineering and Power Technology ,chemistry.chemical_element ,Vanadium ,Condensed Matter Physics ,Fuel Technology ,chemistry ,Volume (thermodynamics) ,Desorption ,Solid body ,Gas chromatography ,Hydrogen production ,Nuclear chemistry - Abstract
This paper describes the system being designed to study the processes of hydrogen isotopes (or their mixtures) interaction with a solid body at pressures up to 500 MPa. Hydrogen isotopes pressure is produced by a thermodesorption source based on vanadium dihydride. Gas is sampled through an intermediate volume. Gas chromatograph is used to analyze the gas for isotopic composition. Possibility of the system development is exemplified by temperature dependencies of equilibrium desorption pressures for vanadium dihydride in a pressure range up to 500 MPa obtained using available equipment.
- Published
- 2001
195. A 14-MeV Intense Neutron Source Based on Muon-Catalyzed Fusion - I: An Advanced Design
- Author
-
Alexander Yu. Konobeyev, M. Vecchi, Victor I. Slobodtchouk, Fedor I. Karmanov, L. N. Latysheva, Vladimir A. Arkhangel'sky, Arkady A. Yukhimchuk, L. I. Ponomarev, Viatcheslav V. Anisimov, Nikolay S. Ganchuk, Igor Pshenichnov, and Emanuela Cavalleri
- Subjects
Physics ,Muon-catalyzed fusion ,Muon ,020209 energy ,Nuclear Theory ,General Engineering ,chemistry.chemical_element ,02 engineering and technology ,01 natural sciences ,010305 fluids & plasmas ,Nuclear physics ,Pion ,chemistry ,Deuterium ,Neutron flux ,0103 physical sciences ,0202 electrical engineering, electronic engineering, information engineering ,Neutron source ,Neutron ,Lithium ,Nuclear Experiment - Abstract
The results of the design study of an advanced scheme for the 14-MeV intense neutron source based on muon-catalyzed fusion ({mu}CF) are presented. A pion production target (liquid lithium) and a synthesizer [liquid deuterium-tritium (D-T) mixture] are considered. Negative pions are produced inside a 17/7 T magnetic field by an intense (2-GeV,12-mA) deuteron beam interacting with the 150-cm-long, 0.75-cm-radius lithium target. Muons from the pion decay are collected in the backward direction and stopped in the D-T mixture of the synthesizer. The synthesizer has the shape of a 10-cm-radius sphere surrounded by two 0.03-cm-thick titanium shells. At 100 {mu}CF events/muon, it can produce up to 10{sup 17}n/s of 14-MeV neutrons. A quasi-isotropic neutron flux up to 10{sup 14} n/cm{sup 2}.s{sup -1} can be achieved in the test volume of {approx}2.5 l with an irradiated surface of {approx}350 cm{sup 2}. The thermophysical and thermomechanical analyses show that the technological limits are not exceeded.
- Published
- 2001
196. Erratum to: 'Data Acquisition System for the Focal Plane Detector of the Mass Separator MASHA'
- Author
-
A. V. Gulyaev, A. V. Gulyaeva, L. Krupa, A. V. Podshibyakin, S. V. Stepantsov, S. Motycak, A. V. Belozerov, V. S. Salamatin, J. Kliman, A. S. Novoselov, S. A. Yukhimchuk, A. M. Rodin, A. B. Komarov, E. V. Chernysheva, V. Yu. Vedeneyev, and D. Kamas
- Subjects
Physics ,Nuclear and High Energy Physics ,Radiation ,Optics ,Nuclear magnetic resonance ,Data acquisition ,business.industry ,Separator (oil production) ,Radiology, Nuclear Medicine and imaging ,Focal plane detector ,business ,Atomic and Molecular Physics, and Optics - Published
- 2016
197. [Untitled]
- Author
-
Vladimyr A. Arkhangel'sky and A. A. Yukhimchuk
- Subjects
Nuclear and High Energy Physics ,Materials science ,Muon ,business.industry ,Nuclear engineering ,Schematic ,Condensed Matter Physics ,Atomic and Molecular Physics, and Optics ,Catalysis ,Heat exchanger ,Neutron source ,Tritium ,Neutron ,Physical and Theoretical Chemistry ,business ,Thermal energy ,Nuclear chemistry - Abstract
The paper presents a schematic design of a Tritium Fuel Cycle for Muon-Catalyzed Intense Neutron Source (MC INS) capable of producing 14 MeV neutrons. Based on the assumption that the fuel mixture should be used in a liquid phase different approaches are proposed to incorporate a DT cell (synthesizer) into the MC INS facility. Estimations of the total tritium inventory in the MC INS facility are given. The calculations of the DT cell operation temperature regime using the code FLOW-3D(R) are presented. The capability to remove the thermal energy released in the DT cell of the proposed design is shown. The MC INS design is analyzed from the viewpoint of tritium safety requirements.
- Published
- 2001
198. Some Aspects of Sublimation Growth of SiC Ingots
- Author
-
V.A. Yukhimchuk, S.F. Avramenko, V.S. Kiselev, and M. Valakh
- Subjects
Materials science ,Mechanics of Materials ,Residual stress ,Mechanical Engineering ,Metallurgy ,General Materials Science ,Sublimation (phase transition) ,Condensed Matter Physics - Published
- 2001
199. [Untitled]
- Author
-
A. I. Rudenko, A. M. Demin, V. A. Nazarov, I.I. Sukhoi, D. L. Demin, S. K. Grishechkin, V. G. Grebinnik, A.A. Kukolkin, S. V. Medved, V. Ia. Rozhkov, A.B. Modenov, N. N. Grafov, V.G. Zinov, Victor R. Bom, V. G. Klevtsov, S. V. Zlatoustovskii, A. D. Konin, Yu. V. Smirenin, A. A. Yukhimchuk, Yu.P. Averin, V. V. Filchenkov, V. T. Sidorov, S. M. Sadetsky, C.W.E. van Eijk, A.E. Drebushko, A. N. Golubkov, Nikolai Voropaev, V. I. Pryanichnikov, G. G. Semenchuk, V.P. Dzhelepov, and V.V. Travkin
- Subjects
Nuclear and High Energy Physics ,Fusion ,Muon ,Isotope ,Hydrogen ,Cycle rate ,Analytical chemistry ,chemistry.chemical_element ,Condensed Matter Physics ,Atomic and Molecular Physics, and Optics ,Catalysis ,chemistry ,Physical and Theoretical Chemistry ,Atomic physics ,Sticking probability - Abstract
Experimental study on muon catalyzed dt fusion in a triple mixture of hydrogen isotopes (H/D/T) was carried out at the JINR phasotron. The measurements have been performed at various temperatures and densities with liquid and gaseous H/D/T mixtures. Results are presented for the main characteristics of the dtμ cycle. A reduction of the number of dt fusions is observed when hydrogen is added to the D/T mixture, This is mainly due to muon loss to the pt and pd cycles, which have a high sticking probability. We also observe an increase of the cycle rate when the temperature of the H/D/T mixture rises. This confirms the theoretical prediction.
- Published
- 2001
200. [Untitled]
- Author
-
A. A. Yukhimchuk and A. N. Golubkov
- Subjects
Nuclear and High Energy Physics ,Hydrogen ,Isotope ,Chemistry ,Hydride ,Enthalpy ,Analytical chemistry ,chemistry.chemical_element ,Vanadium ,Condensed Matter Physics ,Temperature measurement ,Atomic and Molecular Physics, and Optics ,Deuterium ,Desorption ,Physical and Theoretical Chemistry ,Nuclear chemistry - Abstract
Equilibrium pressures of protium and deuterium desorption over a two-phase area of monohydride-vanadium dihydride were measured. Temperature measurement range was 300–635 K and the pressure range 1–500 MPa. Obtained temperature-dependences of fugacities within the given measurement range are: lgf(MPa) = −2152/T+ 6.6 and lgf(MPa) = −2575/T + 7.4 for protium and deuterium, respectively. The values of enthalpy and entropy for vanadium dihydride phase formation were calculated from obtained relations. Using expressions obtained for fugacities and literature data on hydrogen imperfection the pressures, which can be obtained with vanadium dihydride employed in thermodesorption hydrogen sources, were estimated. Taking into account that due to deterioration in strength properties of the used structural materials, the heating temperature of the load-bearing body is limited to ∼973 K, maximal calculated pressure, which can be obtained with such sources as ≈1820 MPa for protium and ≈2220 MPa for deuterium.
- Published
- 2001
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