[en] In the frames of T-invariance the analysis of the general dependence of the elastic scattering effective cross section of a particle with spin 1/2 on the unpolarized target with arbitrary spin upon the initial and final polarizations of the particle has been performed. On the base of the T-symmetry of the differential scattering cross section only, without traditional consideration of the spin structure of scattering amplitudes, a simple proof of the Wolfenstein theorem is obtained (this theorem states that the degree of transverse polarization, arising in the elastic scattering of an unpolarized particle on the unpolarized target, is equal to the coefficient of left-right asymmetry in the elastic scattering of the same but transversally polarized particle on the same target). Meantime, it is ascertained that in the case of P-parity violation (conserving T-invariance) there exists no analogous universal relation between the degree of longitudinal polarization and the coefficient of P-odd spin asymmetry in the scattering of longitudinally polarized particles. It is shown, further, that under T-invariance the amplitude and cross section of 'backward' scattering of neutrons on zero-spin nuclei do not depend on spin, and the observation of such a dependence would testify unambiguously to the T-invariance violation. However, according to the fulfilled estimates, the T-noninvariant spin asymmetry in the 'backward' scattering is very small (about 10^-8 - 10^-7)

[en] An approach based on the dynamic equation was used and it was shown how the phenomenologically distorted wave can be found and how to restore the corresponding optical potential if this wave is known

[en] Nuclear-rainbow effects in elastic and inelastic scattering and transfer reactions by the ³He + ¹²C and ⁴He + ¹²C interactions at E(³He) = 98 MeV and E(⁴He) = 90 MeV respectively are observed analyzing the angular distributions of the ^2,3H , ^3,4He and ⁶Li particles. The data have been analyzed by a near/far-side formalism using Fuller's model. It has been shown that the far-side component plays the main role in all studied processes. The present investigation proposes a method for the optical model parameter choice for entrance and exit channels. We also observe the different characteristics of the rainbow effects and of the shape of the angular distributions for very deep inelastic processes (high excitation energies) and transfer reactions

[en] The presented communication summarizes our last publications dedicated to investigations of interference effects which are manifested in cross sections and time durations of nuclear reactions

[en] The mechanism of the total disintegration of atomic nuclei by fast hadrons and nuclei is considered. The passage of energetic hadrons through layers of intranuclear matter, accompanied by emission of fast nucleons with kinetic energies from about 20 up to about 500 MeV from definite local small regions in the nuclei around projectile courses in them, allows one to explain simply the occurrence of the total destruction of nuclei involved in the collisions. Light nuclei may be totally disintegrated by fast hadrons and nuclei; heavier nuclei may be totally disintegrated only in central collisions of nuclei with similar mass numbers

[en] Elastic scattering angular distributions are calculated for light nuclei ⁷Li, ⁷Be, ⁸He, ⁸Li, ⁸B, ¹¹Li, ¹¹Be, ¹¹B, ¹¹C, scattered by target-nucleus ¹⁴C at different projectile energies. Optical potentials are constructed in the framework of the folding model on the basis of the M3Y effective nucleon-nucleon force and the densities calculated for all colliding nuclei with the density functional method. The influence of the nuclear matter distributions on the differential cross-sections is investigated. The rainbow-like picture of the angular distributions has been demonstrated. (author)

[en] This course is an introduction to the dominant effects of longitudinal and transverse spin in deep inelastic reactions. Only the effects present to the 'leading twist' are attacked. The mass and transverse impulsion of partons are neglected. We will attach to bring out the respective specificities of longitudinal and transverse polarizations. (N.C.)

[en] Investigations of the PNC-effect of ²³⁵U fission fragment emission and interference effects of forward-backward left-right asymmetry were carried out on the neutron beams of the IBR-30 over the range of neutron energies from 0.02 to 90 eV. Satisfactory theoretical description of these effects below 6.6 eV was achieved for the first time. As a result of theoretical analysis, the main parameters of the p-wave resonances and the first estimates of the nuclear matrix elements of the weak interaction were extracted

[en] A percolation model based on tetrahedral binding among neighbouring sites is proposed in the framework of the nuclear fragmentation. It is shown that the tetrahedral percolation allows the formation of more compact clusters and this feature seems to succeed in simulating the secondary decay effects. (author)

[en] Short note. 1 tab