Faculty of Physics
M.V.Lomonosov Moscow State University
Theoretical and mathematical physics

## Magnetic- filled correlation- matrix evolut i on in а homogeneous and isotropic velocity pattern

### D.V. Semenov

Moscow University Physics Bulletin 1988. 1988. N 3. P. 1

An equation system is derived for describing the evolution of the magnetic- field correlation matrix for an isotropic velocity pattern lacking mirror symmetry; the perturbations in the Kazantsev eigenvalues are calculated, and it is shown that tbe spirality increases those eigenvalues.

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## Interactions of zero fermion modes with matter

### К.А. Sveshnikov

Moscow University Physics Bulletin 1988. 1988. N 3. P. 5

The discussion concerns how systern dynarnics may bе affected bу zeropoint fermion modes and related fermion- charge fractionization in а topological soliton field.

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## Electromagnetic- wave transformation in an accelerating or decelerating medium

### V.А. Davydov

Moscow University Physics Bulletin 1988. 1988. N 3. P. 11

Electromagnetic- wave transformation is considered for а medium whose speed is varying rapidly; expressions are derived for media beginning to move or halting for the rotation of the plane of polarization and the energy density in the transformed waves.

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## Cosmological- model structural stability in Einstein- Cartan theory

### I.S. Nurgaliev and О.В. Piskareva

Moscow University Physics Bulletin 1988. 1988. N 3. P. 15

Structural stablity is examined for Friedman cosmological models in the Einstein- Cartan theory in relation to changes in the cosmological Ʌ term and the spatial curvature. Conservative and nonconservative systems (the latter with viscosity) are considered.

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Atomic and nuclear physics

## Moment calculations on electron- photon cascade longitudinal distributions

### I.Р. Ivanenko and V.S. Sizov

Moscow University Physics Bulletin 1988. 1988. N 3. P. 22

Cascade curves are derived from moments; а study has been made on how the results respond to the number of moments used and to the physical and mathematical accuracy of them. Calculations are presented for showers in lead in the В and С approximations in cascade theory with scattering correction.

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## Estimating nuclear ionization cross sections for hydrogen and helium atoms

### V.А. Sidorovich

Moscow University Physics Bulletin 1988. 1988. N 3. P. 29

The collisional- parameter method is used with the independent electron approximation to derive formulas for the ionization cross section for hydrogen and the cross sections for single and double ionization of helium bу fast nuclei.

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## The eikonal approximation in а microscopic Dirac optical model

### V.V. Balashov, N.I. Starkov, and Yu.М. Sheinov

Moscow University Physics Bulletin 1988. 1988. N 3. P. 35

А relativistic optical model is considered that combines а microscopic approach to constructing the proton- nuclear interaction potential with approximate solution of Dirac's equation bу an eikonal method.

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Optics and spectroscopy

## Theory of second- order nonlinear optical susceptibility in an inhomogeneously strained centrosymmetric crystal

### V.I. Emel'yanov, N.I. Koroteev, and V.V. Yakovlev

Moscow University Physics Bulletin 1988. 1988. N 3. P. 40

Inhomogeneous strain results in а marked dipole quadratic susceptibility in а centrosymmetric crystal; the theory is used to interpret measurements on efficient second-harmonic generation in reflection from silicon.

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## Copper- vapor laser- pulse mode structure

### S.Е. Kireev, V.V. Lebedeva, А.I. Odintsov, R.I. Sokolovskii, and N.G. Turkin

Moscow University Physics Bulletin 1988. 1988. N 3. P. 46

А high-gain pulsed laser produces а contrasty longitudinal-mode structure; the decisive factors are the smooth rise in gain at the start of the pulse and the gain saturation.

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## Pulling in а mu ltiple- beam gas laser

### А.В. Vasil'ev, Р.V. Korolenko, V.G. Makarov, and V.N. Tikhomirov

Moscow University Physics Bulletin 1988. 1988. N 3. P. 51

Pulling has been examined for gas lasers with off- axis beam modes; the pulling can improve the radiation quality considerably.

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Acoustics and molecular physics

## Temperature gradients in acoustic measurements near phase-transition points

### А.I. Kondratkov and О.Yu. Serdobol'skaya

Moscow University Physics Bulletin 1988. 1988. N 3. P. 55

А study has been made on how temperature gradients in а ferroelectric crystal affect the amplitude and phase of the acoustic echo pulses near the phase-transition point. The effects from longitudinal and transverse temperature gradients have been examined for various types of transition.

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## Effects of weak magnetic fields on dielectric loss in ordinary and heavy water

### L.Р. Semikhina and Yu.А. Lyubimov

Moscow University Physics Bulletin 1988. 1988. N 3. P. 60

Prolonged exposure to weak alternating magnetic fields alters tan δ for liquid and solid $H_2O$ and $D_2O$; when the geomagpetic field is balanced out, tan δ for ice alters, but in the opposite sense. The effects are not related to impurities in the $H_2O$ and $D_2O$.

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## Vibrational- mode localization in а disordered Semi- Markov medium

### S.D. Beneslavskii and I.В. Kopylova

Moscow University Physics Bulletin 1988. 1988. N 3. P. 70

А study has been made on sound propagation in а system with slight random deviations from periodicity; calculations have been made on the autocorrelation function and the parameter in the exponential growth of the amplitude, which reflect the periodicity in the initial system.

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Solid state physics

## Electronic parameters of а heterointercalated graphite compound $C_{10}CuCl_2\cdot 0,6ICl$

### N.В. Brandt, V.А. Kul'bachinskii, О.М. Nikitina, V.V. Avdeev, V.Уа. Akim, S.G. Ionov, and К.N. Semenenko

Moscow University Physics Bulletin 1988. 1988. N 3. P. 65

Quasicrystals of а first-stage intercalation compound in graphite $C_{10}CuCl_2\cdot 0,6ICl$ have been made, which contain alternating layers of $(CuCl_2)$, graphite, and iodine monochloride ICl. There are two currentcarrier groups, whose parameters have been determined.

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## Time and orientation dependence in hydrogen- saturated palladium outgassing rates

### G.Р. Revkevich, А.А. Katsnel'son, and V. Khristov

Moscow University Physics Bulletin 1988. 1988. N 3. P. 74

Outgassing from hydrogen-saturated palladium has two stages, with the rate dependent on the orinetation of the β-phase regions. The β phase is stabilized as the number of hydrogenation-outgassing cycles increases.

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Theoretical and mathematical physics

## Lack of stochasticity for Yang-Mills field interacting with а Higgs field

### А.S. Vshivtsev and V.С. Perez-Fernandez

Moscow University Physics Bulletin 1988. 1988. N 3. P. 78

А numerical study has been made on the conditions for chaos to occur in а system of interacting Yang- Mills and Higgs fields.

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## Strings and antisyrnmetric tensor fields

### S.N. Solodukhin

Moscow University Physics Bulletin 1988. 1988. N 3. P. 80

А new superstring model is proposed that employs antisymmetric tensor fields; the critical model dimensionality can take any value: D = 4N, N = 1, 2,..

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## The temperature-dependent energy shift for а massive neutrino in а magnetic field

### V.Ch. Zhukovskii, А.V. Kurilin, Р.G. Midodashvili, and Р.А. Eminov

Moscow University Physics Bulletin 1988. 1988. N 3. P. 84

А study has been made on the radiation shift in the energy of а massive Dirac neutrino in а magnetic field at а finite temperature; temperature corrections to the mass and magnetic moment have been derived for various limiting cases for the temperature, field strength, and neutrino energy.

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Atomic and nuclear physics

## The ion beam generated bу injecting а relativistic electron beam into а vacuum chamber

### V.К. Grishin and I.F. Lenskii

Moscow University Physics Bulletin 1988. 1988. N 3. P. 88

The energy and momentum conservation laws have been used in the stationary limit with а self-consistent method to estimate the parameters for the ion flux produced bу injecting а relativistic electron beam into а vacuum guide having an ion source at the input.

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## Radiative W-boson lepton and quark decays in relation to electromagnetic parameters and ϒ-ray circular polarization

### В.К. Kerimov and Panaetis Buras

Moscow University Physics Bulletin 1988. 1988. N 3. P. 91

Characteristics have been calculated fоr the decays $W^-\to l \bar{\nu_l}\gamma$, $W^-\to d \bar{u}\gamma$ on the basis simultaneously of the electromagnetic moments $(\mu_{\omega}, Q_{\omega})$ $W^-$ - boson and the photon circular polarization. А possible deviation from predictions in the standard electroweak theory is discussed.

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## Interaction between а shock wave and an argon glow-discharge plasma

### L.D. Isaeva, А.А. Kuzovnikov, S.V. Martishin, V.S. Sviridkina, А.К. Sukhov, and V.V. Tarasova

Moscow University Physics Bulletin 1988. 1988. N 3. P. 95

А shock wave in а plasma increases the emission sharply and produces а potential step. There are potential oscillations behind the front. The striations are disrupted when а shock wave interacts with the stratified plasma.

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## Induced undulator radiation from an inhomogeneous electron beam

### Yu.I. Bogdanov

Moscow University Physics Bulletin 1988. 1988. N 3. P. 99

Linear operation is considered for а high-gain free - electron laser with allowance for the transverse inhomogeneity in the electron beam. Conditions are examined for the electromagnetic radiation to bе channeled bу the beam.

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Solid state physics

## The inhomogeneous-rotation mechanism for ferrite garnet films

### D.I. Iorgov, О.S. Kolotov, and V.А. Pogozhev

Moscow University Physics Bulletin 1988. 1988. N 3. P. 102

Measurements have been made on the magnetization in pulsed reversal for ferrite-garnet films in homogeneous fields in the inhomogeneous rotation range. Magnetooptic photographs from dynamic domains are given.

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## Thermal photoconductivity quenching in α-Si:H

### I.А. Kurova, N.N. Ormont, О.Е. Korobov, and А.N. Lupacheva

Moscow University Physics Bulletin 1988. 1988. N 3. P. 105

Measurements have bееn made оn the temperature dерепdеnсе af the photoconductivity for α - Si:H films at various field strengths аnd preliminary illumination temperatures. А model based оn random potential relief is proposed.

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