Scheme of 181^Ta levels excited in the (N/n'γ) reaction
Scheme of 181^Ta levels excited in the (N/n'γ) reaction
V.D. Avchukhov, M.R. Ahmed (Iraq), K.A. Baskova, Т.M. Bekukh, A.B. Vovk, L.I. Govor, and A.M. Demidov
Измерен спектр Ƴ-лучей при неупругом рассеянии быстрых нейтронов реактора на 181^Та. Из спектра выделена 71 Ƴ-линия, из них 40 обнаружена впервые. Среди известных уровней 181^Та размещены лишь немногие из найденных нами Ƴ-переходов. Для размещения части' из впервые обнаруженных Ƴ-переходов введено 11 уровней следующих энергий: 886,4; 988,4; 1091,0; 1349,2; 1381,2; 1432,9; 1616,5; 1636,7; 1643,3; 1746,1 и 1769,4 кэВ. Обнаружено отклонение экспериментальных величин заселяемостей низколежащих уровней 181^Та от значений, вычисленных с помощью статистической модели.
Show AbstractExcitation of a periodic structure in an open resonator
Excitation of a periodic structure in an open resonator
D.G. Afoniri and A.I. Kostienko
The dispersion characteristics of hemispherical resonators with a plane mirror covered with a periodic structure of the "comb" type and low-Q open systems consisting of a radiating antenna of the "horn" type and a plane mirror with a periodic structure are investigated experimentally. Effective interaction between an electron beam close to the periodic structure with the harmonics (up to the tenth) of the diffraction mode and also with higher harmonics in the traveling-wave modes are found.
Show AbstractSome characteristics of the waveguide mode of a gas laser
Some characteristics of the waveguide mode of a gas laser
D.A. Kozyrev and P.V. Korolenko
The efficiency of the feedback provided by the external mirrors of the resonator for a He-Ne waveguide laser at a wavelength of 3.39 μm is investigated experimentally. The experimental data obtained are compared with the results of theoretical calculations and show good agreement. The spatial distribution of the field of the modes of oscillation generated by the laser are investigated for different parameters of the resonators and gas-discharge tubes. It is established that tuning of the laser mirrors leads to complication of the mode composition of the emission. The dependence of the gain margin on the degree of detuning of the laser mirrors is measured.
Show AbstractMagnetic characteristics of highly dispersed iron
Magnetic characteristics of highly dispersed iron
O.S. Galkina, L.V. Lazareva, Т.M. Shvets and A.S. Shitova
The results of an experimental investigation of the concentrational dependence of magnetic characteristics of the form K=f(C)and K=f(Cm), where К is the measured magnetic parameter, С is the concentration of powder in the specimen, and Cm is the iron particle packing density in the specimen, are given. The electrochemical method employed to obtain highly dispersed iron enabled us, by varying the electrochemical electrolysis mode, to obtain powders with different concentrations of the magnetic phase Cm in them. It is shown that all the fundamental magnetic characteristics (the saturation magnetization Is, the remanence Ir, the shape of the hysteresis loop, and the coercive force) depend both on the concentration of the magnetic phase in the initial specimens Сm, and on the particle packing density in the specimen Cm.
Show AbstractCorrelation function of spatial fluctuations of light scattered by the nematic phase of a liquid crystal
Correlation function of spatial fluctuations of light scattered by the nematic phase of a liquid crystal
S.V. Kir'yanov
We calculate the correlation function for fluctuations of the electrical component of a light field which is scattered by fluctuations in the orientation of the molecules in a nematic liquid crystal (NLC). It is shown that taking into account the fluctuations of the complete orientation tensor Sij leads to the occurrence of elements in the correlation matrix of the scattered field which cannot be obtained from examining the scattering of light from the director fluctuations in an NLC. We compare the correlation matrices of the fluctuations of the scattered field in an NLC and an isotropic liquid crystal (ILC). It is established that the correlation matrix of the scattered field changes strongly on transition from scattering light in the isotropic phase of the LC to scattering in the nematic phase.
Show AbstractThe effect of the interaction of acoustic waves in layered media
The effect of the interaction of acoustic waves in layered media
E.P. Lanina
Parametric interaction between acoustic waves in layered periodic nonlinear media is considered. The conditions for synchronism between the signal wave and the pumping wave is investigated using numerical methods. Parametric interaction between the waves in a plexiglass - water periodic structure was observed experimentally. The local gain and the suppression of the signal were measured.
Show AbstractPeriodic density distribution function of nonequilibrium charge carriers in an inhomogeneously illuminated semiconductor
Periodic density distribution function of nonequilibrium charge carriers in an inhomogeneously illuminated semiconductor
A.F. Rumynina
We examine several features of a spatially inhomogeneous nonequilibrium system with interband absorption of light. The fluctuational stability of such a system is also established.
Show AbstractA new version of nonlinear electrodynamics (II)
A new version of nonlinear electrodynamics (II)
V.N. Ponomarev and E.V. Smetanin
We obtain the dynamical (wave and soliton) solutions of the equations of a nonlinear electrodynamics, the nonlinearity of which is caused by the contortion of space-time.
Show AbstractDebye screening and ion current onto a probe in the case of arbitrary electron energy distribution function
Debye screening and ion current onto a probe in the case of arbitrary electron energy distribution function
V.A. Dovzhenko, A.P. Ershov, and G.S. Solntsev
We obtain an expression for the electron Debye radius and derive formulas for calculating the ion current onto a probe for an arbitrary isotropic electron distribution function. An algorithm is given for extracting the second derivative of the electron current when measuring the electron distribution function by the method of Dreyvesteyn.
Show AbstractExperimental determination of the resonance contour of a three-layer interferometer
Experimental determination of the resonance contour of a three-layer interferometer
M.A. Khashchan (Egypt)
The change in the modulation depth of the interferogram of a three-layer interferometer as a function of the relative displacement of the transmission maxima of the component layers is analyzed experimentally. The fringes are displaced by rotating the interferometer with slightly wedge-shaped layers. The interferogram was recorded photoelectrically by scanning the fringes of equal inclination. The experimental relationship between the contrast of the modulation fringes and the relative displacement leads to the establishment of an analytical equation for the apparatus function of the interferometer.
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