A microscopic model for three-cluster configurations in light nuclei is presented. It uses an expansion in terms of Faddeev components for which the dynamic equations are derived. The model is designed to investigate binary channel processes in a compound system. Gaussian and oscillator bases are used to expand the wave function and to represent appropriate boundary conditions. We study the effect of cluster polarization on ground and resonance states of 7 Be, and on the astrophysical S-factor of the reaction 6 Li(p, 3 He) 4 He.

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We apply the microscopic three-cluster model, developed by the authors recently, to study the effects of cluster polarization on the capture reactions 3 He(α, γ) 7 Be, 3 H(α, γ) 7 Li, 6 Li(p, γ) 7 Be, and 6 Li(n, γ) 7 Li. These reactions are of great importance for astrophysical applications. Thus, the main attention is paid to the cross sections (or the astrophysical S factor) of the reactions in the low-energy region. Correlations between the astrophysical S factor of the reactions at zero energy and different quantities associated with the ground state of a compound nucleus are studied in detail.

Within a microscopic three-cluster α + α+ n(p) model, which is a three-cluster version of the algebraic approach to the resonating group method (AV RGM), we consider the spectra of the low-lying states of mirror nuclei 9 Be and 9 B in the excitation energy range from zero to 5 MeV. The obtained theoretical results are compared with the available experimental data. K e y w o r d s: spectra of nuclei, three-cluster microscopic model, resonating group method, energy range

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Local dislocation densities were measured in glide bands of deformed KCl single crystals revealed by etching. The distributions of local dislocation densities are obtained and their variations along the glide bands, and from one band to another are studied. The degree of agreement of the experimental histograms with two standard distribution functions (Poisson and Gauss), corresponding to random and correlated distributions, respectively, shows that the distribution of screw dislocations agrees with the Poisson‐like shape along the total band length. Edge bands show various distribution forms: “Poissonian” as well as “Gaussian” regions are observed. The “Gaussian” behaviour of the distribution in edge bands is related to the elastic interaction between dislocations. The correlation found between the form of the distribution function and the dislocation density is explained on the basis of increasing contribution of this interaction with increasing dislocation density. It is shown that separate portions of the glide band cannot be regarded as representative for the entire glide band, because the parameters of the distribution function and its form change along the glide band.

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