SovietRxiv · Open Access in English
Rediscovering the Soviet scientific archive, in English
25357 full-text translations 14926 English PDFs 22539 abstracts
Showing 50 of 2226 papers in Physics
This paper develops a superconductivity theory that incorporates crystal structure beyond the nearly free electron and effective mass approximations. Using a strongly bound electron model, orthogonalized atomic functions, and an electron, phonon interaction Hamiltonian, it derives secular equations …
The paper investigates the origin of weak electron paramagnetic resonance lines associated with nitrogen ions in a natural diamond crystal, questioning earlier interpretations that attributed them to unpaired electrons in carbon, nitrogen bonds. Using angular dependences of EPR spectra measured at 9…
This paper proposes a semiempirical method for constructing approximate shock adiabats of solids over pressures extending from experimentally accessible dynamic-compression ranges to ultrahigh pressures where hydrodynamic and Thomas-Fermi descriptions are applicable. The approach decomposes pressure…
This paper theoretically investigates self-focusing of intense axially symmetric monochromatic light beams in a nonlinear Kerr medium when the incident beam has a spherical phase front produced by a converging lens. The authors formulate the propagation problem in dimensionless variables and solve i…
This note derives trace formulas for the connected part of the resolvent of the quantum mechanical Hamiltonian for three nonrelativistic particles with pairwise interactions, under regularity and spectral assumptions on the pair potentials. Using Faddeev’s framework, Hilbert’s identity, and direct i…
This paper investigates vibrational excitation and dissociation of diatomic oxygen in atom molecule collisions in a high temperature argon gas. Using a classical mechanical treatment with an anharmonic intramolecular potential, the authors compute level to level transition and dissociation probabili…
This paper applies the quasioptical potential method to simple exactly solvable quantum field theory models with a fixed heavy source, in order to clarify how energy dependent, time nonlocal interactions appear in scattering. Starting from a factorized nonlocal potential, the scattering amplitude is…
This paper examines the definition of entropy in nonequilibrium statistical mechanics, focusing on the relation between Planck, Boltzmann, and Gibbs coarse-grained entropies for an isolated classical system divided into weakly interacting subsystems. It defines coarse-graining by assigning a constan…
This paper examines the use of electron-optical converters for recording soft X-ray radiation, focusing on the difficulty of reducing exposure while preserving image quality in X-ray diffraction imaging. The authors describe a four-stage converter with a thin mica input window, an internal photocath…
Electron paramagnetic resonance spectra of impurity Cu(II) were studied in binary oxide glasses based on phosphate, silicate, and borate formers with alkali or alkaline-earth modifiers, at room and liquid-nitrogen temperatures. The spectra are interpreted with an axial spin Hamiltonian and indicate …
This paper reports an experimental study of luminescence in uranyl crystals and frozen solutions excited by high-power ruby laser radiation, with emphasis on whether the observed emission arises from two-photon absorption and whether stimulated emission can be obtained. Luminescence spectra were rec…
This paper develops a weakly relativistic formulation of classical statistical mechanics for systems in which terms beyond order v squared over c squared may be neglected. It constructs the one-particle and Gibbs phase spaces using synchronized laboratory time, derives quasicanonical equations of mo…
This paper examines how the crystallographic orientation of single-crystal molybdenum and tungsten affects the angular and energy distributions of secondary ions scattered under low-energy ion bombardment. Using energy analysis of ions emitted from heated crystal faces while varying the azimuthal ro…
This paper formulates alternative properties of physical systems, such as locality, causality, spectrality, and energy positivity, in terms of projection operators and associated constraint equations. It applies this framework to quantum field theory, deriving projector conditions for two-field and …
This paper estimates the probability of double beta decay in nuclei far from the beta stability band, where the available decay energy and number of accessible final states may be much larger than in stable nuclei. The authors derive and use expressions for two-neutrino and neutrinoless double beta …
This paper investigates the early dynamics of optical breakdown in air produced by a train of ultrashort mode-locked neodymium laser pulses. The authors use an FER-2 image-converter photochronograph with a modified laser-triggered spark-gap sweep circuit, reducing the trigger delay to about 10 to 15…
This paper analyzes the excitation of low-frequency nonpotential oscillations in the electron-hole plasma of a solid when an electric current flows across an external magnetic field. Using a hydrodynamic approximation with quasineutrality, Maxwell equations without displacement current, and conditio…
This paper analyzes recombination radiation from a nondegenerate electron-hole plasma in a semiconductor plate under current-induced pinch conditions. Using a one-dimensional plate model, the authors derive expressions for the spectral and integral radiation intensities in terms of carrier distribut…
The paper addresses the decomposition of direct products of irreducible representations of crystal space groups, a problem needed for applying selection rules and constructing exciton and related states in solid-state physics. It formulates a method, mainly for symmorphic space groups, for determini…
This paper examines whether finite amplitude drift waves in an inhomogeneous magnetized plasma can exhibit nonlinear excitation mechanisms absent from linear theory. Using a drift kinetic treatment with quasineutrality, the authors analyze a standing drift wave and isolate the contribution of electr…
This paper develops asymptotic solutions for the diffraction of a plane electromagnetic wave by a perfectly conducting strip, formulated as a Neumann boundary-value problem for the Helmholtz equation. Using the method of edge waves together with the factorization method, the surface current and far-…
This paper analyzes recombination radiation from a semiconductor pinch when both electron and hole gases are strongly degenerate, with indium antimonide used as the principal example. It derives expressions for the spectral radiation density for direct band-to-band transitions, taking into account p…
This paper provides a statistical mechanical justification for a real gas equation of state expressed through elementary functions of reduced density and reduced temperature. Starting from the Mayer and Bogolyubov virial form, the authors separate repulsive and attractive contributions to the irredu…
This study examines mixed fluoride crystals based on cadmium fluoride activated with neodymium ions as potential active media for optical quantum generators, motivated by concentration quenching and unsuccessful laser action in simple CdF2:Nd3+ crystals at room temperature. The authors investigated …
Mössbauer resonant absorption of 23.8 keV gamma rays by Sn-119 was measured in tin films condensed on glass at 4.2 K, with superconducting transitions also recorded by mutual inductance. Thin freshly deposited films showed a shift of the absorption maximum toward higher energies, line broadening, an…
The paper examines the propagation of plane harmonic Rayleigh surface waves in semiconducting piezoelectric gallium arsenide, including interaction with conduction electrons, conductivity, and electron diffusion. Starting from coupled elastic, piezoelectric, electrostatic, and carrier-continuity equ…
This paper reports a calorimetric determination of the electron temperature behind the front of a collisionless shock wave in hydrogen plasma. The method infers the post-front temperature from the delayed increase in charged-particle concentration caused by inelastic ionization losses of shock-heate…
The paper analyzes formation of the \(N^*(3,3)\) isobar in the reaction \(\pi^-p \to \pi^+\pi^-n\) using experimental effective mass distributions for the \((\pi^-n)\) system over incident pion energies from 365 to 780 MeV. The authors fit the mass spectra with a model containing background and isob…
This paper examines the bimodality of angular distributions of shower particles in inelastic nucleon and pion interactions near 10 to 20 GeV, a phenomenon previously contrasted with predictions of multiple meson production models and sometimes attributed to fireballs. Using proton proton and pion pr…
This paper examines delayed nuclear fission following beta decay in heavy nuclei far from the beta-stability band, where the beta-decay energy may exceed the fission barrier of the daughter nucleus. Using systematics of beta-decay half-lives, semiempirical alpha-decay estimates, spontaneous-fission …
This paper reports an experimental observation of acoustic subharmonics generated by an intense ultrasonic wave in a liquid medium. Motivated by calculations predicting a second order subharmonic spectrum at fractional frequencies of the fundamental, the study used a 500 kHz barium titanate radiator…
This paper examines electron heat transport in a high-temperature plasma confined by a toroidal magnetic field, focusing on drift-wave instability associated with trapped electrons in systems with small magnetic shear. Using a kinetic treatment for trapped electrons in a Tokamak-type geometry, the a…
This paper develops a method for solving the spatially homogeneous Boltzmann equation by expanding the distribution function in Hermite polynomials about a Maxwellian. For a quasi-Maxwellian molecular interaction model, the Boltzmann equation is reduced to a recurrent system of ordinary differential…
The paper studies how the geodesic paths of test bodies in a gravitational field can be modeled in another Riemannian space of the same signature by introducing an effective force in the equations of motion. It formulates complete modeling, in which all timelike and null geodesics of the original sp…
This paper proposes a holographic method for transforming coherent light fields so that radiation with an arbitrary or distorted wavefront can be converted into a prescribed phase distribution, including a plane wave. The method records the interference of two beams on a hologram and then reconstruc…
The paper studies bound states of two particles governed by the Schrödinger equation with an attractive screened Coulomb, or Yukawa, potential, focusing on whether the ground state binding energy vanishes at a finite screening parameter. A spherically symmetric solution is constructed as a functiona…
This paper examines whether microscopic discontinuities, modeled as narrow vacuum gaps or slits in a thermoelectric material, can improve thermoelectric performance by suppressing lattice heat transport while still permitting electron transfer over or through the barrier. Using phenomenological tran…
This paper calculates quadrupole and octupole one-phonon states in even-even deformed nuclei with mass numbers 174 to 188, including the first two states with K pi equals 0 positive and 2 positive and octupole states with K pi equals 0 negative, 1 negative, and 2 negative. Using the superfluid nucle…
This paper calculates resonant charge exchange cross sections for ions colliding with atoms of group II elements using asymptotic theory. The exchange interaction is expressed through the asymptotic form of the outer electron wave function, with the asymptotic coefficient taken from Hartree-Fock dat…
This paper examines the angular distribution of elastic high energy hadron scattering by summing the scattering amplitude within a simple core scattering model. The model gives separate expressions for the imaginary and real parts of the amplitude outside the backward peak and a real amplitude near …
This paper develops a statistical method for determining kinetic coefficients from the time dependence of fluctuations in a steady state, where ordinary macroscopic diffusion has already reached a uniform distribution. Generalizing Smoluchowski’s treatment of Brownian motion, it relates the mean squ…
This paper examines interband optical absorption in disordered systems whose charge carriers move independently in a static, slowly varying random field, with possible relevance to strongly alloyed, amorphous, liquid, or glassy semiconductors. Using a quasiclassical expansion of one-particle Green f…
This paper develops a unified waveguide theory for multibeam spectrum analyzers, including prisms, diffraction gratings, Michelson echelons, Lummer Gehrcke plates, and Fabry Perot etalons. Treating these instruments as equivalent series or parallel waveguide radiating systems, it derives general exp…
The paper reformulates the axiomatic theory of a Hermitian scalar quantum field in terms of operator Jacobi matrices associated with an orthogonal decomposition of the Hilbert space generated from the vacuum. It shows how the field operators split into creation, diagonal, and annihilation parts, and…
This paper examines how quantum effects in thermal fluctuations may influence the temperature dependence of the lifetime of solids under tensile stress, especially at temperatures comparable with the Debye temperature. Using a simplified polymer model in which fracture is governed by longitudinal st…
This paper develops a computational procedure for determining reflection and transmission matrices of electromagnetic waves incident on a finite spherically layered anisotropic medium, with application to ionospheric propagation. The method extends prior impedance-matrix recalculation by deriving fo…
The paper studies when unbounded operators in bosonic Fock space can be represented in normal form as series in creation and annihilation operators. It develops domain-sensitive definitions for parts of operators, tensor and symmetric products of unbounded operators, and coefficient matrices control…
This paper develops an approximate Green’s function method for analyzing ferromagnetic resonance in a system of interacting magnetic moments subject to constant and high-frequency magnetic fields, including exchange, anisotropic exchange, and demagnetizing interactions. It first gives the exact zero…
This paper examines how hydrostatic compression affects the symmetry of the luminescence center in polycrystalline europium benzoylacetonate, using the splitting of the europium ion transition from the 5D0 to 7F1 level as a diagnostic of the local crystal field. The authors compare the pressure evol…
The work addresses conflicting reports on whether the luminescence quantum yield of neodymium glass depends on excitation wavelength, a question relevant to evaluating laser glass materials. Quantum yields were measured for KGSS-3 and KGSS-7 glasses by comparing absorbed and emitted photon numbers f…
