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Search Results: 1 - 10 of 87772 matches for " I. Barabanov "
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Fission via compound states and JπK A. Bohr's channels: what we can learn from recent studies with slow neutrons
Barabanov A.L.,Furman W.I.
EPJ Web of Conferences , 2012, DOI: 10.1051/epjconf/20122108002
Abstract: Last data on angular correlations of fission fragments from slow (s-wave) neutron induced binary fission of spin-aligned nuclei 235U are discussed in the context of JπK A. Bohrs channels. Special attention is paid to K = 0 channel. Reasons for its suppression are specified for compound nucleus states of negative parity. A brief overview of recent data on T-odd angular correlations in ternary and binary (with emission of a third particle, a neutron or γ-quantum) fission induced by slow polarized neutrons is presented. On the basis of the developed theoretical approach it is shown that a valuable information on JπK fission channels at scission point can be inferred from these T-odd angular correlations.
Elementary Excitations in the Symmetric Spin--Orbital Model
M. Y. Kagan,K. I. Kugel,A. V. Mikheyenkov,A. F. Barabanov
Physics , 2014, DOI: 10.1134/S0021364014150089
Abstract: Possible types of elementary excitations in the symmetric spin-orbital model on the a square lattice are analyzed using a spherically symmetric self-consistent approach. The excitation spectra are calculated. The behavior of the corresponding correlation functions depending on the temperature and parameters of the model is studied. A schematic phase diagram is plotted. It is shown that the thermodynamics of the system is mainly determined by elementary excitations with the entangled spin and orbital degrees of freedom.
Cosmogenic activation of Germanium and its reduction for low background experiments
I. Barabanov,S. Belogurov,L. Bezrukov,A. Denisov,V. Kornoukhov,N. Sobolevsky
Physics , 2005, DOI: 10.1016/j.nimb.2006.05.011
Abstract: Production of $^{60}$Co and $^{68}$Ge from stable isotopes of Germanium by nuclear active component of cosmic rays is a principal background source for a new generation of $^{76}$Ge double beta decay experiments like GERDA and Majorana. The biggest amount of cosmogenic activity is expected to be produced during transportation of either enriched material or already grown crystal. In this letter properties and feasibility of a movable iron shield are discussed. Activation reduction factor of about 10 is predicted by simulations with SHIELD code for a simple cylindrical configuration. It is sufficient for GERDA Phase II background requirements. Possibility of further increase of reduction factor and physical limitations are considered. Importance of activation reduction during Germanium purification and detector manufacturing is emphasized.
Spectrophotometry of asteroids 32 Pomona, 145 Adeona, 704 Interamnia, 779 Nina, 330825, and 2012 QG42 and laboratory study of possible analog samples
Vladimir V. Busarev,Sergey I. Barabanov,Vyacheslav S. Rusakov,Vasiliy B. Puzin,Valery V. Kravtsov
Physics , 2015, DOI: 10.1016/j.icarus.2015.08.001
Abstract: Six asteroids including two NEAs, one of which is PHA, accessible for observation in September 2012 were investigated using a low-resolution spectrophotometry in the range 0.35-0.90 um with the aim to study features of their reflectance spectra. For the first time we discovered likely spectral signs (as a maximum at 0.4-0.6 um in reflectance spectra) of simultaneous sublimation activity and presence of a temporal coma on three primitive-type main-belt asteroids, Adeona, Interamnia, and Nina, being at perihelion distances or approaching to it. We suggest that such a cometary-like activity may be a common phenomenon at the highest subsolar surface temperatures for C and close type asteroids including considerable amounts of H2O and CO2 ices beneath the surface. However, excavation of fresh ice at recent impact event(s) could be an alternative explanation of the phenomenon. Similar absorption bands centered at 0.38, 0.44 and 0.67-0.71 um registered in the reflectance spectra of Adeona, Interamnia, and Nina clearly point to predominantly silicate surface matter. To specify its content, we performed laboratory investigations of ground samples of known carbonaceous chondrites (Orguel, Mighei, Murchison, and Boriskino) and seven samples of low-iron Mg serpentines as possible analogs of the asteroids. In particular, we found that the equivalent width of the band centered at 0.44 um in reflectance spectra of the low-Fe serpentine samples has a high correlation with content of Fe3+ (octahedral and tetrahedral). It means that the absorption feature can be used as an indicator of ferric iron in oxidized and hydrated low-Fe silicate compounds on asteroids (abridged).
Andriy Grekhov,Yuriy Barabanov
Proceedings of National Aviation University , 2011,
Abstract: The teaching technique of discipline "Systems of aviation telecommunicationss is presented.The content of modules and the list of laboratory works is given. Laboratory works are connectedwith computer modeling in Mathcad and MATLAB Simulink environments.Розглянуто методику викладання дисципл ни Системи ав ац йного електрозв'язку англ йською мовою. Наведено зм ст модул в та перел к лабораторних роб т, пов’язаних змоделюванням на комп’ютерах в середовищах Mathcad та MATLAB Simulink.Рассмотрена методика преподавания дисциплины Системы авиационной электросвязи на английском языке. Приведено содержание модулей и перечня лабораторных работ,связаных с моделированием на компьютерах в средах Mathcad и MATLAB Simulink.
Possible stimulation of nuclear alpha-decay by superfluid helium
A. L. Barabanov
Physics , 2009, DOI: 10.1103/PhysRevLett.103.092501
Abstract: It is suggested that superfluid helium (condensate of 4-He atoms) may stimulate nuclear alpha-decay in a situation when an alpha-emitter moves through superfluid helium with fine-tuned velocity, so that the backward-emitted alpha-particle is at rest in the laboratory frame. It is shown that the probability of stimulated alpha-decay in this case may be sizable enough to be detected.
Spin-orbit interaction in final state as possible reason for T-odd correlation in ternary fission
A. L. Barabanov
Physics , 2007, DOI: 10.1016/j.physletb.2007.06.057
Abstract: A model for ternary fission is discussed in which a third particle (alpha-particle) is emitted due to non-adiabatic change of the nuclear potential at neck rapture. An expression for energy and angular distribution of alpha-particles is proposed. It is shown that an interaction between spin of fissioning system and orbital momentum of alpha-particle (spin-orbit interaction in the final state) results in recently observed asymmetry of alpha-particle emission, which can be formally related to T-odd correlation. No strong dependence of the asymmetry on the angle of alpha-particle emission with respect to the fission axis is predicted by the model in accordance with the experimental data.
Does the excited state of the $^3$H nucleus exist?
A. L. Barabanov
Physics , 1994,
Abstract: The suggestion is made that the excited state of the $^3 H$ nucleus found out recently in the reaction $H$ ($^6 He$,$\alpha$) ({\it Pis'ma JETPh\/} {\bf 59} (1994) 301) has spin and parity $1/2^+$ and the same configuration that the ground one of $^6 He$. An amplitude of electromagnetic transition to the triton ground state is strongly suppressed, therefore the excited state cannot be detected in radiative capture of neutrons by deuterons. It is shown that in an elastic nd-scattering a resonance associated with the exited state may be absent due to the destructive interference of potential and resonant scattering phases.
Model for Resonance Enhancement of P- and T-noninvariant Effects in Neutron Reactions
A. L. Barabanov
Physics , 1995, DOI: 10.1016/S0375-9474(96)00454-X
Abstract: We consider a simplified model for resonant neutron-nucleus interaction with coupled channels. An analytical solution is given for two coupled channels and arbitrary neutron orbital momentum. A case of a week channel coupling, corresponding to narrow Breit-Wigner resonance, is analyzed in details. As far as the total width of a resonance coincides with the neutron width, the model is directly appropriate only for light nuclei. We study a mixing of two narrow s- and p-wave resonances by P- and P-,T-noninvariant potentials in the first order of perturbation theory. As an example a close-lying pair of s- and p-wave resonances of the $^{35}$Cl nucleus is considered. The favorable possibilities are shown to exist on thick targets for measurements beyond the resonance widths. In particular, an interference minimum near s-wave resonance is of interest for P-odd neutron spin rotation on light spinless nuclei.
Fission fragment orientation and gamma ray emission anisotropy
A. L. Barabanov
Physics , 1994,
Abstract: Experimental data on angular distributions of gamma rays emitted from binary and ternary spontaneous fission of $^{252}{\rm Cf}$ are analyzed. Their difference indicates that the alignment of fragments is higher in ternary fission than in binary one. The consequences of possible relation between the mechanism of ternary fission and the excitation of collective modes during the saddle-to-scission stage are discussed.
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