[en] An electrostatic spectrometer is constructed for investigations of conversion electron spectra and continuous beta-spectra in the 0.5-50 keV range. The spectrometer consists of two analyzers: spherical decelerator and a double cylindrical mirror analyzer. Beta-particles are detected by a channel electron multiplier. The spectrometer is fully automated on the basis of modules and microcomputer in the CAMAC standard. The slowing down voltage is stabilized with precision of 10^-₅. The conversion electron spectrum of ₁₆₉Yb is measured. An energy resolution of 8.1 eV is obtained for 10.6 keV electrons. In the measured value of the natural line width (approximately 5 eV) is also taken into account. The instrumental energy resolution is δE/E approximately 0.06% (i. e. δP/P approximately 0.03%)

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No abstract available

[en] An empirical method in the depth-selective ME-spectroscopy for determination of the depth distribution of the resonance matter in thin surface layers is proposed. The method is based on the experimentally determined change of the energy distribution of resonance conversion electrons emitted from a thin layer which is subsequently covered with absorbing layers of known thickness. The distribution of the resonance matter in the depth of an unknown sample is determined either by suitably constructed nomograms or by solving a system of linear equations with experimentally determined co-efficients. (Auth.)

[en] The mechanism of tin diffusion into copper was investigated using the Moessbauer effect for a case of a very high thickness of the diffusion layer. Moessbauer spectra for various phases of the Cu-Sn system are presented. (Z.S.)

[en] The electrostatic spectrometer, consisting of a spherical moderator and a double cylindrical mirror, is designed to investigate electron spectra of internal conversion and continuous β-spectra for energy range 0.5-50 keV. β-particle detection is carried out by means of a channel electron multiplier. The spectrometer is fully automated on the basis of blocks and microcomputer in the CAMAC standard. Decelerating voltage is stabilized with an error of approximately 10sup(-5). An electron spectrum of internal conversion at ¹⁶⁹Yb decay is measured. Energy resolution, ΔE=8.1 eV, for electrons with energy 10.6 keV (Li 20.7) is obtained, the natural linewidth equalling approximately 5 eV entering into the experimental value, ΔE. Instrumental energy resolution ΔE/E is approximately 0.06%, i.e. Δp/p approximately 0.03%

[en] The KLL and KLM spectra of Fe (Z=26) Auger electrons were studied on a combined electrostatic electron spectrometer. The relative Auger transition intensities as well as energies of the spectra studied have been determined. Intensity ratio of the KLM/KLL groups has been determined as well. A noticeale discrepancy has been found between the measured relative intensities of the strongest KLL Auger transitions and the results of the relativistic calculations in the approximation of intermediate coupling with a configuration interaction. The experimental relative intensities of the KLM Auger transitions were compared with the results of the calculations in the frame of both the intermediate coupling and the jj coupling scheme. It follows from the comparison that the adequate calculations of the KLM transition intensities should be based on the intermediate coupling. The KLM/KLL group intensity ratio obtained is in good agreement with the theoretical predictions

[en] High-spin states in ^108,110Pd isotopes are studied by γ-ray spectroscopy of heavy-ion induced fission. The Pd isotopes were produced in the fission channel of the ³¹P + ¹⁷⁶Yb reaction at beam energy 152 MeV. The prompt γ-rays are detected with the EUROBALL4 multidetector array. The level scheme of ¹⁰⁸Pd was extended with a new negative parity band. In ¹¹⁰Pd the yrast sequence was observed up to spin I=14⁺ and negative parity bands have been identified. The excitation energy ratio E(4⁺)/E(2⁺) for the ^108,110Pd isotopes is 2.42 and 2.46 respectively, which is close to 2.5 predicted for an O(6) transitional γ-soft rotor. The band-crossing in these Pd isotopes is assigned to a low-Ω_νh11/2 configuration. The negative parity states arise from two neutron configurations: νh_11/2 x νg_7/2 and νh_11/2 x νd_5/2

[en] The atomic capture and transfer of stopped negative pions have been studied in binary gas mixtures of H₂+M, where M is CCl₂F₂, CClF₃, CBrF₃ or SF₆. The π⁰ yield, versus relative atomic concentration Csub(A) of M, goes through a maximum at Csub(A)proportional0.1 and levels off at zero at high concentrations. This phenomenon together with other observed characteristics of the atomic capture and transfer of pions in these systems is interpreted in the frame of a phenomenological model. The average transfer coefficients anti Λsub(Z) exhibit a weak concentration dependence. The estimated average atomic capture ratios anti A(Z/H) are lower than those found for noble gases, probably because of the mutual screening of the constituent atoms in the molecules. The probability of pion capture in an atomic orbit is not proportional to the stopping power of the components of the mixture. (orig.)

[en] To study the influence of matter macroscopic properties on the negative muon atomic capture the muonic X-ray spectra have been measured from silicon at 77 deg and 295 deg, from VO₂ at 295 deg and 355 deg, and from V₂O₃ at 77 deg and 295 deg using a Ge(Li) spectrometer 55 cm³ in volume and ''on-line'' technique. It is shown that neither changes of a conductivity in all targets, nor a rebuilding of both vanadium oxydes crystal structure at phase transition does not cause any alteration in muonic X-ray spectrum. The obtained results are discussed in terms of a ''time pit''