[en] Damping of nuclear collective vibration is studied within the framework of the Vlasov-Landau equation including retardation (memory) effects in the collision integral. The expressions for the nuclear viscosity and the width of the giant multipole resonances in a heated nucleus are obtained by taking into account quadrupole dynamic distortion of the Fermi surface. These expressions allow for a transition between the regimes of rare and frequent two-body collisions. An interpolation formula for the width is proposed in which allowance for all multipolarities of the distortion of the Fermi sphere is made. The width of the giant dipole resonance as a function of excitation energy is calculated using this formula for the Sn nuclei region. The results for the width variation with temperature are in a qualitative agreement with the experimental data. They show a smoother behavior with increasing temperature compared to that of the zero sound model

[en] The work is dedicated to the application of the noncompact group theory in nuclear spectroscopy. By the method of induced representations the principal series of representations of SL(3,IR) group is constructed. The results obtained are applied to the description of E 2-transition probabilities in even - even deformed nuclei (with mass number 150< A<194)

[en] We present a unified theory of nucleon and heavy ion induced reactions in an approach which accounts consistently for multistep direct (MSD) and (in the case of nucleon induced reactions) for multistep compound (MSC) processes. In a statistical treatment of the nuclear spectroscopy in the continuum the MSD part of the cross section is obtained as an incoherent superposition of n-step contributions, folded with transition strength functions which are specified in the QRPA theory. In the MSC part the evolution of the system is described in the space of closed channels, using level densities from a realistic shell model. The theory is applied to inclusive (n,n') data at incident energies between 7 and 25 MeV on ⁹³ Nb. In all cases double differential and angular integrated cross sections are described very well in magnitude and shape without fitting parameters to the data. The calculations exhibit a smooth transition between MSC and MSD contributions that increases in width with increasing energy. For heavy ions we describe ¹² C inclusive spectra on ¹² C, ⁵⁸ Ni, and 90 Zr at about 30 MeV/A by inelastic excitation and transfer-breakup to the continuum up to energy losses of about 60 MeV

[en] A microscopical method is proposed to derive the diagonal and nondiagonal components of the inertia tensor for a dinuclear system. It is shown that the coupling of the radial and mass asymmetry modes is weak for almost symmetric configuration but it enhances significantly as the asymmetry increases

[en] The calculations of the particle-hole (exciton) level density and the rates for preequilibrium particle emission, taking into account the energy dependence of the single-particle level density, are presented. We demonstrate the significant effect of the finite of the potential well (continuum effect) on the decay rates for configurations with a small exciton number

[en] The influence of the shell effects on the characteristic of the compound-nucleus decay and on the fission channel probability was investigated. The xn and αxn channels are analyzed and the characteristics of the excitation functions, comparing the results with refined statistical model calculations which account for the time-dependent dynamical effects through the transient time needed to establish a constant flow over the fission barrier are studied. The available experimental data show a steep decrease of the xn-reaction cross sections at the transition from the Ac-Th to U-Np compound nuclei.The αxn-reaction cross-section also have a sudden decrease but at the transition from U to Pu compound nuclei. A diffused barrier model that accounts for sub-barrier fusion is used

[en] Evaporation residue cross sections and mean angular momenta for the system ⁶⁴ Ni + ⁶⁴ Ni calculated in the framework of a semi-microscopic multi-dimensional model are presented. The proposed multi-dimensional model of the fusion process takes into account the ion deformations during the sub-barrier tunneling. This leads to a strong enhancement of both the sub-barrier fusion cross section and the mean angular momentum. Dissipation of kinetic energy during the heavy ion collisions and competition between fission and particle evaporation after the formation of compound nucleus are taken into account. A good description of evaporation residue cross section and mean angular momenta for the system ⁶⁴ Ni + ⁶⁴ Ni is obtained

[en] The method for evaluation of branching ratios for the direct nucleon decay of high-spin subbarrier single-particle states in near-magic (''hard'') medium and heavy nuclei is given. The method is based on the simplest version of the coupled-channels approach and the simple optical model. Some applications of the method have been considered

[en] It is shown that an exponential decrease of inclusive energy spectra (accompanied by slight oscillations) with energy increase in high-energy nuclear reactions, independent of fragments, targets, projectiles and projectile energies, can be explained by a new phenomena of time resonances. Time resonances correspond to the formation of a few high-exited, long-living and non-exponentially decaying nuclear dots at the background of a spectator

[en] The most urgent problems of the role of statistical fluctuations in heavy ion collision and fission of compound nuclei are formulated. The classical dynamic calculations with fluctuating force based on the Langevin equation and one-body dissipation are presented