[en] By means of prismatic magnetic β-spectrometer UMB-1 with the sources of sup(114M)In (Tsub(1/2)--50 days) the intensity ratios of the spectrum lines of conversion electrons L₁:L₂:L₃, M₁:(M₂+M₃), M₂:M₃, (M₁+M₂+M₃):(M₄+M₅), N₁:(N₂+N₃+N₄+N₅), N:M and O:N have been measured. The ratios N:M and O:N have been measured with sup(114M)In in metallic indium and in InAs and InSb compounds. In all the compounds the ratios N:M are the same with an accuracy better than 10 %. The internal conversion probability in the valence shell is very small (O:N approximately 0.02). The measured differences of O:N in different compounds do not exceed the limits of big experimental errors (approximately 50 %)

[en] With the help of nuclear gamma resonance method the oxidation of Pbsub(x)Snsub(1-x)Te thin films of thickness of 10 m was studied the oxidation being as long as 6 to 180 min in the temperature range from 423 to 873 K. Resistance to the oxidation depends on the phase structure of the studied thin film. All thin films investigated were resistant to the influence of atmospheric oxygen up to 673 K

[en] Lifetime of minority charae carriers in the Si and Ge p-n unctions has been measured by pulse method of conductivity modulation of base. Its dependence on the X-ray radiation dose has been investigated. Dependence of current transmission coefficients on the dose has been measured and their sharp decrease at low doses and the following saturation at high doses have been observed. Linear dependence of lifetime on X-ray radiation dose has been obtained. Resulting from the comparison of regularities of the change of lifetime due to current characteristics, it has been shown that X-ray radiation leads to the formation of the surface defects, influencing the change of current characteristics as well as to stationary structural defects, causing the decrease of lifetime of the charge carriers with the increase of X-ray radiation dose

[en] In the multiconfiguration approximation, taking into account the excitation from the 2s- and 2p-shells onto the 3s, 3p and 3d shells, the calculations of the total energy of all the terms of the hydrogen and nitrogen atoms and several ions in the configurations lssup(2)2s2psup(N) (N=1-6), ls²2s²2p²3s, ls²2s²2p²3p and ls²2s²2p²3d, have been carried out. The defined wave function of the atom has been constructed independently for every term on the basis of the L-S coupling. Analytical radial orbitals have been used. The comparison of the data obtained with the available experimental values of the energy as well as with the calculations performed by other authors, has been made. It has been shown that in the case of the excited configurations 2s2psup(N) rather satisfactory values of the term energies can be obtained in multiconfiguration approximation taking into account 10-12 energetically nearest configurations

[en] The object of investigation is complex electronic configurations of atoms in the case of j-j coupling, which is more characteristic of the ions of high multiplicity than LS coupling. Mathematical quasi-spin apparatus is used, which is applied successfully by the authors in similar studies. The tensorial properties of the two- particle operators in the space of two subshells are considered. By means of the vectorial addition of the momenta, mixing of two subshells is determined and the wave function of such a system is formed. Nonspecific physical operator is expressed in terms of the irreducible tensors of the quasi-spin and total momentum spaces. The methods described are sufficient when obtaining the expressions for the matrix elements of the atomic unit operators in the case of mixing of two subshells of j-j coupling

[en] Presented is introduction to the theory of the chemical changes of the radioactive decay constants, caused by the changes of the chemical enviroment of the atomic nuclei, in the case of electron capture. Formulas for the calculation of the relative changes of the radioactive decay constants Δlambda/lambda are presented for the electron capture transitions of different types. For the allowed and for the first forbidden nonunique transitions Δlambda/lambda is determined by the change of the probabilities of the capture of s and psub(1/2) electrons. Deviations from the proportionality between Δlambda/lambda and the changes of electron density in the region of the nucleus, resulted from the change of the binding energy of the electron capture and from the exchange and overlap corrections, are possible. For the nonunique transitions of the higher order of the forbiddeness and for the unique forbidden transitions Δlambda/lambda can be determined by the change of the probability of the capture of psub(3/2) electrons. Quantitative estimations of the possible chemical influence on the decay constant lambda for the nuclei of different chemical elements and isotopes are given

[en] It is shown that with the cut-off of the basis of model oscillator functions the class of potentials occurs, equivalent to each other in calculation respect. Resulting from the narrowina of the basis realistic potential becomes equivalent to some ordinary one, having little in common with the initial. This impedes the possibility of finding the correlation between the used internucleon interaction and the results of the calculated properties of a nucleus

[en] Positron-containing negative ions are examined by the method of the Fock self-consistent field in a single-configuration approximation and possibilities of the existence of such systems in a ground state are defined. An algorithm and a program of numerical solution of the Hartree-Fock equations have been developed for solving this problem. e⁺A^- systems with the nucleus charge from 1 to 17 are considered. In all the cases the affinity of negative ions with positrons is shown to be positive, which confirms the possibility of the existence of such exotic formations relative to a decay into a negative ion and a positron. However, these systems turned out to be energy-unstable relative to their decay to produce the corresponding neutral ion and positronium. The experimental and theoretical works on positron-containing systems available are reviewed

[en] The intensity of the X-ray thermal scattering on the crystallographic (002) and (200) planes of the hexagonal CdSe has been measured in the range 93-293 K. The one and two phonon scattering intensities at 293 have been found according to the temperature dependence. The distribution of the mean square displacements of the longitudinal and perpendicular CdSe lattice vibrations in Brillouin zone along the c axis of the third order and in the plane (a, b) which is perpendicular to c, has been determined using the absolute intensity of the one-phonon scattering. The characteristic temperatures and mean square displacements of the CdSe lattice for thermal vibrations along and across the main c axis of the lattice are shown to be 138, 186 K, and 0.0269, 0.0201 nanometer, respectively. An agreement with the values, obtained using the intensity of the coherent scattering, has been observed

[en] Classification of states of three or four equivalent fermions has been studied, i.e. possible terms and their multiplicities have been determined. For this purpose either the group theory or evident expressions for the fractional-parentage coefficients have been used. In the first approach the formulas obtained by other authors for the multiplicities of terms through the characters of the transformation matrices of bond moments have been used. This approach happens to be more general as compared with the second one, as expressions for the fractional-parentage coefficients in many cases are not known. The multiplicities of separate terms have been determined. It has been shown that the number of terms of any multiplicity becomes constant when l or j is increased