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Exact Analytical Solutions in Three-Body Problems and Model of Neutrino Generator
Takibayev N.Zh.
EPJ Web of Conferences , 2010, DOI: 10.1051/epjconf/20100305028
Abstract: Exact analytic solutions are obtained in three-body problem for the scattering of light particle on the subsystem of two xed centers in the case when pair potentials have a separable form. Solutions show an appearance of new resonance states and dependence of resonance energy and width on distance between two xed centers. The approach of exact analytical solutions is expanded to the cases when two-body scattering amplitudes have the Breit-Wigner’s form and employed for description of neutron resonance scattering on subsystem of two heavy nuclei xed in nodes of crystalline lattice. It is shown that some resonance states have widths close to zero at the certain values of distance between two heavy scatterer centers, this gives the possibility of transitions between states. One of these transitions between three-body resonance states could be connected with process of electron capture by proton with formation of neutron and emission of neutrino. This exoenergic process leading to the cooling of star without nuclear reactions is discussed.
Excited nuclei in neutron star crusts
N. Takibayev,K. Kato,D. Nasirova
Advanced Studies in Theoretical Physics , 2013,
Abstract: The paper considers the chains of successive electron capture reactionsby nuclei of the iron group which take place in the crystal structuresof neutron star envelopes. It is shown that as a result of suchreactions the daughter nuclei in excited states accumulate within certainlayers of neutron star crusts. The phonon model of interactions isproposed between the excited nuclei in the crystalline structure, as wellas formation of highly excited nuclear states which emit neutrons andhigher energy photons.
The formation of strong electric fields and volumetric charges in the Solar atmosphere
A. T. Sarsembaeva,N. Zh. Takibayev,K. Kato
Advanced Studies in Theoretical Physics , 2012,
Abstract:
The formation of strong electric fields and volumetric charges in the Solar atmosphere
A. T. Sarsembaeva,N. Zh. Takibayev,K. Kato
Physics , 2012,
Abstract: The processes occurring in the solar atmosphere are diverse and depend on many important factors. For example, from magnetic fields, their sudden changes, from emissions of substance from the depths of the Sun, distribution of shock waves and plasma jets, etc. The paper describes the model of formation of the charged volumes of gas in solar atmosphere, which is called solar "storm clouds" by analogy with terrestrial storm clouds. The model will be based on the theory ionization equilibrium and the Saha equation.
Neutron resonances in few-body systems and the EOS of neutron star crust
N. Takibayev,K. Kato,M. Takibayeva,A. Sarsembayeva,D. Nasirova
Physics , 2012, DOI: 10.1007/s00601-013-0598-0
Abstract: The effective interactions formed by neutron rescattering between the nuclei fixed in nodes of the crystalline lattice of neutron star crusts have been considered. In the case of two-body resonances in neutron-nucleus subsystems new neutron resonances of few-body nature come into existence in the overdense crystal under certain conditions. The energies and widths of new resonances get additional dependence on the lattice parameters. The effective interactions result in nonlinear correction to the equation of state determined by the balance of gravitational, Coulomb and nuclear resonance forces. This leads to resonant oscillations of density in the accordant layers of crusts that are accompanied by oscillations of gamma radiation. The phenomena may clarify some processes connected with few-body neutron resonances in neutron star crusts, that have influence on the microstructure of pulsar impulses.
Excited nuclei in neutron star crusts
Nurgali Takibayev,Kiyoshi Kato,Diana Nasirova
Physics , 2012,
Abstract: The paper considers the chains of successive electron capture reactions by nuclei of the iron group which take place in the crystal structures of neutron star envelopes. It is shown that as a result of such reactions the daughter nuclei in excited states accumulate within certain layers of neutron star crusts. The phonon model of interactions is proposed between the excited nuclei in the crystalline structure, as well as formation of highly excited nuclear states which emit neutrons and higher energy photons.
Lightest Kaonic Nuclear Clusters
Roman Ya. Kezerashvili,Shalva M. Tsiklauri,Nurgali Zh. Takibayev
Physics , 2015,
Abstract: We present our study of kaonic three-body $\overset{\_}{K}NN$, $\overset{\_}{K}\overset{\_}{K}N$ and $KK\overset{\_}{K}$ and four-body $\overset{\_}{K}% NNN $, $\ $and $\overset{\_}{K}\overset{\_}{K}NN$ clusters within the framework of a potential model using the method of hyperspherical functions in momentum representation. To perform a numerical calculations for the bound state energy of the light kaonic system, we use a set of different potentials for the nucleon-nucleon and $\overset{\_}{K}N$ interactions, as well as for the kaon-kaon interaction. The calculations show that a quasibound state energy is not sensitive to the $NN$ interaction, and it shows very strong dependence on the $\overset{\_}{K}N$ potential. We also compare our results with those obtained using different theoretical approaches. The theoretical discrepancies in the binding energy and width for the lightest kaonic system related to the different $NN$ and $\overset{\_% }{K}N$ interactions are addressed.
Voluminous D2 source for intense cold neutron beam production at the ESS
Esben Klinkby,Konstantin Batkov,Ferenc Mezei,Troels Sch？nfeldt,Alan Takibayev,Luca Zanini
Physics , 2014,
Abstract: The development of the flat moderator concept at ESS recently opened up the possibility that a single flat moderator above the target could serve all the scattering instruments, that rely on high brightness. This would allow for the introduction of a fundamentally different moderator below the target for the complementary needs of certain fundamental physics experiments. To facilitate experiments depending on the total number of neutrons in a sizable beam, the option of a voluminous D2 moderator, in a large cross-section extraction guide is discussed and its neutronic performance is assessed.
Low dimensional neutron moderators for enhanced source brightness
Ferenc Mezei,Luca Zanini,Alan Takibayev,Konstantin Batkov,Esben Klinkby,Eric Pitcher,Troels Sch？nfeldt
Physics , 2013,
Abstract: In a recent numerical optimization study we have found that liquid para-hydrogen coupled cold neutron moderators deliver 3 - 5 times higher cold neutron brightness at a spallation neutron source if they take the form of a flat, quasi 2-dimensional disc, in contrast to the conventional more voluminous shapes used by now. In the present paper we describe a simple theoretical explanation of this unexpected behavior, which is based on the large difference in para-hydrogen between the values of the scattering mean free path for thermal neutrons (in the range of 1 cm) and its much larger equivalent for cold neutrons. This model leads to the conclusions that the optimal shape for high brightness para-hydrogen neutron moderators is the quasi 1-dimensional tube and these low dimensional moderators can also deliver much enhanced cold neutron brightness in fission reactor neutron sources, compared to much more voluminous liquid D2 or H2 moderators currently used. Neutronic simulation calculations confirm both of these theoretical conclusions.
Implementation of a Higher Quality dc Power Converter  [PDF]
N. N. Barsoum
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2010, DOI: 10.4236/jemaa.2010.22012
Abstract: Many single and three-phase converters are well developed, and covered up in most of electric markets. It is used in many applications in power systems and machine drives. However, an exact definite output signal from the dc side still not recognized. The waveforms of output voltage and current demonstrate an imperfect dc signal and constitute losses, harmonic distortion, low power factor, and observed some ripples. An approximately perfect rectifier bridge is the aim of this research. Perhaps it gives the ability to identify the parameters of the converter to obtain, as much as possible, a perfect dc signal with less ripple, high power factor and high efficiency. Design is implemented by simulation on Power Simulator PSIM, and practically, a series regulator LM723 is applied to provide regulating output voltage. Comparisons of both simulation and hardware results are made to observe differences and similarities.
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