Volume 28, Issue 2, March 1997
28(1997); http://dx.doi.org/10.1134/1.953034View Description Hide Description
The baryonic decays of hypernuclear resonances built on and configurations are analyzed within the framework of the translationally invariant shell model. Weak mesonless decays are also studied. Special attention is paid to the effect of the nuclear structure on the population probabilities of excited states of daughter systems.
The method of time-ordered graph decoupling and its application to the description of giant resonances in magic nuclei28(1997); http://dx.doi.org/10.1134/1.953052View Description Hide Description
A microscopic approach to analyzing the excited states of magic nuclei is described. It is based on the systematic use of the method of quantum Green functions. When applied to the theory of giant multipole resonances, the approach explicitly includes the three principle mechanisms of resonance formation in a finite nucleus: decay via particle–hole configurations of the discrete spectrum, decay via particle–hole configurations with a particle in the continuum, and decay via more complicated configurations of the type. The results of a numerical realization of this approach for describing giant resonances in magic stable and unstable nuclei are discussed.
28(1997); http://dx.doi.org/10.1134/1.953035View Description Hide Description
In this review it is shown that the Fermi liquid theory of Landau and Migdal is inapplicable to the phonon parts of the excitation spectra of liquidelectrons in solids, and atomic nuclei. A sum rule for the one-particle strength function of a Fermi system is constructed. It is concluded that the self-consistent field coincides with the generalized Hartree–Fock potential of the Fermi system. A relation between the self-consistent potential and the shell and optical potentials of fermions is found. A nonlinear scheme is developed for calculating the static and dynamical characteristics of Fermi systems with the systematic inclusion of fragmentation and retardation effects. It is shown that the interaction of nucleons with collective surface oscillations is crucial in describing the static and dynamical characteristics of nuclei, including superfluid effects. The characteristics of the real parts of the nucleonoptical potentials are calculated using realistic nucleon–nucleon forces. The calculational scheme of optical folding potentials is generalized to the case of composite particles.
28(1997); http://dx.doi.org/10.1134/1.953036View Description Hide Description
A survey of methods for injection of heavy ions in synchrotrons and storage rings is given. The three main injection methods—stacking in the transverse phase space, stacking in the longitudinal phase space, and ion stripping—are described in detail. Combinations of multiturn injection with linear coupling, beam cooling, and rf stacking are represented. Many examples and original results of the author on the simulation of the injection in the Nuclotron booster are given.
28(1997); http://dx.doi.org/10.1134/1.953037View Description Hide Description
Advances in the development of methods of intense antiproton beam storing and cooling has again attracted attention to the problem of generation and experimental studies of antihydrogen atoms. An additional impetus to this activity has been given by the proof to the “existence theorem”—experiments on antihydrogen atom synthesis at CERN. The interest to antiatoms is aroused due to possibility of studies of the fundamental properties of matter, and foremost—its symmetry (the CPT theorem). This report is dedicated to description and analysis of the methods of the antiproton and positronium directed flux generation and experimental studies of the atoms in these fluxes.