[en] A theoretical framework for the description of the decay of giant multipole resonances is developed. Besides the direct decay, both the pre-equilibrium and statistical (compound) decays are taken into account in a consistent way. It is shown that the statistical decay of the GR is not necessarily correctly described by the Hauser-Feshbach theory owing to the presence of a mixing parameter, which measures the degree of fragmentation. Applications are made to several cases. (Author)

[en] Heavy-ion elastic scattering is discussed as containing two features; over all optical behavior characterized by several physical parameters such as the size of the system, the strength of the Coulomb interaction, etc., and deviations from this behaviour related directly to some aspects of the underlying nuclear structure. Two examples of such deviations are discussed in detail. The first is the anomalous back-angle scattering of nα-nuclei. The second example is connected with the effect of deformation. (Author)

[en] The discrepancy between the measured most probable mass split and calculation including shell effects is discussed. It is suggested that during the descent from saddle to scission a number of nucleons tunnel from the light to the heavy fragment because of pairing effects. This process could explain the discrepancy

[en] A general reaction theory of the heavy-ion fusion cross section that exhibits clearly the possible effects of directly coupled channels is developed. The expression obtained for the fusion cross section show how the presence of coupled channels enhances its value in general. The result may be used to standardize the discussion of, e.g., sub-barrier heavy-ion fusion in general. (Author)

[en] From the elastic scattering analysis the input parameters are found for the inelastic scattering analysis and the transfer reactions of the heavy ion reactions. The main theme reported is the likeness and conection among these processes. (L.C.)

[en] A general discussion of coupled channels effects on the heavy ion compound nucleus formation cross section is presented. Both coherent and statistical features of these effects are considered. Heavy ion fusion ractions are then analyzed within a two-step compound model composed of a di-nucleus configuration, representing overlapping quasimolecular resonances, coupled to particle and break-up channels as well as to an equilibrated compound nucleus configuration. The resulting fusion cross sections, defined as the summed particle emission cross section from the equilibrated compound nucleus, are in reasonable agreement with the data for several systems. The time evolution of the HI system is also briefly discussed. (Author)

[en] The several roles of multipole giant resonances in heavy-ion reactions are discussed. In particular, the modifications in the effective ion-ion potencial due to the virtual excitation of giant resonances at low energies, are considered and estimated for several systems. Real excitation of giant resonances in heavy-ion reactions at intermediate energies are then discussed and their importance in the approach phase of deeply inelastic processes in emphasized. Several demonstrative examples are given. (Author)

[en] A constraint is imposed on the possible value of the diffusivity of the imaginary part of the optical model potential used to fit elastic scattering data of light heavy ions at below the barrier energies. This is done by fixing the c.m. energy at which optimal -Q- value - neutron transfer S-factor Crosses the fusion S-factor

[en] A systematic study of the discharge characteristics of a hollow cathode ion source is carried out for optimum and economic utilization. The characteristics are described through the measurement of the corresponding change in the extracted beam. The range of plasma, ion beam density, and beam uniformity are determined for various operating parameters; filament heating current, discharge current and voltage, compensating magnetic field, pressure, and the extraction distance and voltage, a larger ion current is obtained at higher compensating magnetic field. When shorter extracting gap and normal extracting voltage are used. The rate of emission necessary to maintain the discharge, strongly depends on the external field. The discharge range and hence ion current as well as pressure depends on discharge voltage

[en] Evidence that suggests a correct relationship between the optical transmission matrix, P, and the several correlation widths, gamma sub(n), found in nsmission matrix, P, and the several correlation widths, n, found in multistep compound (preequilibrium) nuclear reactions, is presented. A second sum rule is also derived within the shell model approach to nuclear reactions. Indications of the potential usefulness of the sum rules in preequilibrium studies are given. (Author)