Entity

Time filter

Source Type

Khazar, Russia

Omsk State Transport University is a university in Omsk, Russia. It was established in 1961. Wikipedia.


Chushnyakova M.V.,Omsk State Technical University | Bhattacharya R.,University of Calcutta | Gontchar I.I.,Omsk State Transport University
Physical Review C - Nuclear Physics | Year: 2014

Background: In our previous paper [Gontchar, Phys. Rev. C 89, 034601 (2014)PRVCAN0556-281310.1103/PhysRevC.89.034601] we have calculated the capture (fusion) excitation functions for several reactions with O16,Si28, and S32 nuclei as the projectiles and Zr92,Sm144, and Pb208 nuclei as the targets. These calculations were performed by using our fluctuation-dissipation trajectory model based on the double-folding approach with the density-dependent M3Y NN forces that include the finite range exchange part. For the nuclear matter density the Hartree-Fock approach with the SKP coefficient set that includes the tensor interaction was applied. It was found that for most of the reactions induced by O16 the calculated cross sections cannot be brought into agreement with the data. This suggested that the deviation in the calculated nuclear density for O16 from the experimental one was crucial. Method: The SKX parameter set is used to obtain the nuclear densities. Reactions with C12 and S36 as the projectiles and Pb204 as the target are included in the analysis in addition to those of the previous paper. Only data that correspond to the collision energy Ec.m.>1.1UB0 (UB0 is the s-wave fusion barrier height) are included in the analysis. The radial friction strength KR is used as the individual adjustable parameter for each reaction. Results: For all 13 reactions (91 points) it is possible to reach an agreement with the experimental fusion cross sections within 10%. Only at ten points does the deviation exceed 5%. The value of KR, which provides the best agreement with the data in general, decreases as the system gets heavier in accord with the previous paper [Gontchar, Phys. Rev. C 89, 034601 (2014)PRVCAN0556-281310.1103/PhysRevC.89.034601]. A universal analytical approximation for the dependence of KR upon the Coulomb barrier height is found. Conclusions: The developed model is able to reproduce the above-barrier portion of the fusion excitation function within 5% with a probability of 90%. Only one fitting parameter per excitation function KR is used. The model can be used to predict the results of relevant measurements. The universal analytical approximation of the KR dependence upon the Coulomb barrier height helps to find the starting value of KR for a more accurate description. © 2014 American Physical Society. Source


Chushnyakova M.V.,Omsk State Transport University | Gontchar I.I.,Tomsk Polytechnic University
Pramana - Journal of Physics | Year: 2015

Evolution of the fusion cross-section in the 16O+16O reaction has been analysed. It is shown, both analytically and numerically, that in this excitation function some oscillations can be observed. These oscillations are related to the quantum character of the orbital angular momentum increase as well as to the distinct features of the 16O+16O reaction. In order to perform the numerical calculations, the fluctuation-dissipation model and the single barrier penetration model are used. It turns out that the experimental data available in the literature do not have any definite proof about the presence or absence of the oscillations. We stress, that the question still remains unanswered for more than three decades whereas during this time lapse the experimental errors for other reactions are reduced to 1-2%. © Indian Academy of Sciences. Source


Aktaev N.E.,Omsk State Transport University | Gonchar I.I.,Omsk State Transport University
Bulletin of the Russian Academy of Sciences: Physics | Year: 2011

We present a detailed comparison of the analytical Kramers fission rate (KFR) and the dynamic quasi-stationary rate (QSFR) obtained by numerical simulation. It turns out that for the polynomial poten- tial, the KFR regularly exceeds the QSFR by more than 5%. We obtain KFR corrections that allow us to reduce this disparity to 1%. © 2011 Allerton Press, Inc. Source


Gontchar I.I.,Omsk State Transport University | Chushnyakova M.V.,Omsk State Transport University
Computer Physics Communications | Year: 2013

We present a C-code designed to obtain the interaction potential between a spherical projectile nucleus and an axial-symmetrical deformed target nucleus and in particular to find the Coulomb barrier, by using the double folding model (DFM). The program calculates the nucleus-nucleus potential as a function of the distance between the centers of mass of colliding nuclei as well as of the angle between the axis of symmetry of the target nucleus and the beam direction. The most important output parameters are the Coulomb barrier energy and the radius. Since many researchers use a Woods-Saxon profile for the nuclear term of the potential we provide an option in our code for fitting the DFM potential by such a profile near the barrier. © 2012 Elsevier B.V. All rights reserved. Source


Shiler A.,Omsk State Transport University
Energy Procedia | Year: 2015

For development of railway transport it is important to have reliable, power effective cars. Cars reliability and efficiency strongly depend on a wheel pair construction. To satisf. These needs a wheel pair for a new cars generation was designed. New design has following features: flexible bandage with cylindrical a surface. The wheel center established on own bearings, independent wheel treads. Article investigates design and modeling of new wheel pair movement. Research of wheel pair was conducted using simulation of wheel flange loaded conditions. The optimal flange form is found and analyzed. © 2015 Published by Elsevier Ltd. This is an open access article unde. The CC BY-NC-ND license. Source

Discover hidden collaborations