Study of tellurium monocrystals by Rayleigh scattering of M$\stackrel{..}{o}$ssbauer radiation
Study of tellurium monocrystals by Rayleigh scattering of M$\stackrel{..}{o}$ssbauer radiation
A.A. Kiselev, A.A. Opalenko
The method of Rayleigh scattering of M$\stackrel{..}{o}$ssbauer radiation of $^{57}Co$ is used to measure the elastic-scattering intensity in the (300) and (003) reflections for Те in the temperature range 130-140 K. We determine the root-mean-square displacements of atoms along the [100] and [001] axes.
Show AbstractFormulation of a dynamical theory of X-ray diffraction using recurrence relations
Formulation of a dynamical theory of X-ray diffraction using recurrence relations
A.V. Kolpakov, Yu.N. Belyaev
We develop an exact formulation of the dynamical theory of diffraction in perfect crystals using new recurrence relations for the amplitude reflection and transmission coefficients obtained by the authors. This formulation contains as an approximation the results of Darwin's dynamical theory. We consider the Bragg (finite and semi-infinite crystals) and Laue cases.
Show AbstractParameters of the energy spectrum of layered crystals $CdI_2$
Parameters of the energy spectrum of layered crystals $CdI_2$
Yu.M. Aleksandrov, Ya.O. Dovgii, I.V. Kityk, V.N. Kolobanov, V.N. Makhov, V.V. Mikhailin
The pseudopotential method in the nonlocal approximation is used to calculate the band dispersion in strongly anisotropic wide-band crystals $CdI_2$. From the optical reflection spectra obtained using the synchrotron radiation, we calculate the real ($\epsilon _1$) and imaginary ($\epsilon _2$) parts of the dielectric permittivity at T = 77 К by the Kramers-Konig method. We calculate the band structure of the $CdI_2$ crystals and identify the interband optical transitions from the concrete points of the Brillouin zone.
Show AbstractTemperature quenching of photoconductivity in undoped a-Si:H films
Temperature quenching of photoconductivity in undoped a-Si:H films
I.A. Kurova, N.N. Ormont, V.D. Podrugina, К.B. Chitaya
We study the temperature dependence of the steady-state photoconductivity of undoped films of amorphous hydrogenated silicon for different spectral compositions and intensities of the exciting light. It is observed that the depth of the temperature quenching of photoconductivity is determined by the intensity and energy of a quantum of the exciting light. The observed features agree well with the model of intercenter recombination of charge carriers.
Show AbstractA projection method of solving non-self-conjugate boundary-value problems in waveguide theory
A projection method of solving non-self-conjugate boundary-value problems in waveguide theory
V.I. Modenov, A.G. Sveshnikov
A certain class of non-self-conjugate boundary-value problems in electrodynamics may be solved by a projection method, which is a generalization of Galerkin's incomplete method to a complex space having a pseudoscalar product.
Show AbstractAn asymptotically exact solution for a model of Lie type
An asymptotically exact solution for a model of Lie type
A.V. Soldatov
A model is considered for the interaction of a single-mode boson field with a system of electrons placed at the nodes of an N-node lattice. Bogolyubov's approximating-Hamiltonian method is used to obtain an expression exact in the thermodynamic limit for the free-energy density in the system for the case of an arbitrary electron concentration ($0 < \bar{n} < 2$). The conditions for the existence of a superradiative state are derived.
Show AbstractExact solutions to Dirac's equation in a quantized pseudoscalar wave. Part 2
Exact solutions to Dirac's equation in a quantized pseudoscalar wave. Part 2
V.R. Khalilov, V.C. Perez-Fernandez
Exact solutions have been obtained to Dirac's equation for a pseudoscalar wave whose wave vector $k_{\mu}$ is arbitrary.
Show AbstractSome tasks in electric borehole logging
Some tasks in electric borehole logging
S.N. Davydycheva, V.B. Glasko
Some one-dimensional inverse problems in electric borehole logging are considered, particularly those important to prospecting for oil and gas deposits. It is shown that the solutions to these inverse problems are unique for certain particular cases of the conductivity distribution. A numerical algorithm is derived for solving the direct problem in electric logging for a certain class of models, and another algorithm is described for solving the inverse problem for a layered model. Results are given from numerical experiments.
Show AbstractA note on multiple values arising in quantizing fermion systems
A note on multiple values arising in quantizing fermion systems
A.E. Pukhov
A method is proposed for eliminating the multiple values arising in quantizing a classical system having a finite number of fermion degrees of freedom.
Show AbstractThe effect of a magnetic field on $n \to p+e^-+\bar{\nu_e}$ and $e^-+p \to n + \nu_e$
The effect of a magnetic field on $n \to p+e^-+\bar{\nu_e}$ and $e^-+p \to n + \nu_e$
V.M. Zakharov, Yu.M. Loskutov
It is shown that in the decay of a set of neutrons, as a whole unpolarized in a magnetic field, produces a negative mean value for the projection of the antineutrino momentum on the field direction as calculated per nucleon if the magnetic field is weak or if the initial neutron distribution over the spin states is restored more rapidly than the decay occurs, while it becomes positive in a strong field if the recovery of the initial spin-state distribution is much slower than the decay. An analogous situation occurs in the reaction $e^-+p \to n+\nu_e$.
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