[en] These proceedings contain thirty-six papers grouped under the headings of : Molecular and orbiting phenomena, cluster radioactivity, Effects of deformation in nuclei, Heavy-ion collision potentials, Reaction mechanisms: preequilibrium emission, Reaction mechanisms: emission of fragments, behavior of hot and cold nuclei, Nuclear matter and energy dissipation studies by heavy-ion collisions, Strong field effects in heavy-ion collisions, and Heavy-Ion collisions at relativistic energies

[en] A method for calculating the real and imaginary part of the optical potential from the nucleon-nucleon (NN) interaction is presented. In it, the authors request selfconsistency so that the same force (Reid soft core) determines the ground state properties of the two interacting nuclei including binding energies and mass distributions and also the optical potential. A Weizsacker like surface term (∇ρ)² is added, which cannot be determined in infinite unclear matter. The authors use for the density of the two interacting nuclei two limiting assumptions. In the sudden approximation the two densities are added for each distance R of the two nuclei. In the adiabatic approach they do not allow that the density gets larger that the saturation density. That means that the total density adjusts optimally for each distance. (iv) For the optical potential at higher energies they include the excitation of the nucleons into Δ's. The method proceeds so that the real and the imaginary part if the energy per nucleon in two nuclear matters flowing through each other is calculated as a function of the density for different average relative kinetic energies

[en] The first HELIOS results on ¹⁶O-Nucleus collisions at 200 and 60 GeV/nucleon incident energy are presented. The transverse energy distribution has been measured in the pseudorapidity region:- 0.1<η _lab<2.9 for W, Ag and Al targets. In view of the large E_T reached, the question of the achieved energy density is then addressed. The charge multiplicity density was measured in the interval 0.9<η_lab<5.0. The average charged multiplicity dependence on E_T was studied in a restricted η _lab interval and allowed a preliminary estimate of < E_T> per particle

[en] Present studies of ⁹⁶ Zr with a double subshell closure are reviewed along with studies of neighboring nuclei. Combination of information from these studies are shown to lead to several important new features. Among these are: dual subshell closure in ₄₀ Zr nuclei at N = 56, backbending of the 1g-intruder band as low as spin 6, evidence for double octupole phonon states, dramatic alteration of the low energy structure of the N-59 isotones, and the need for a stronger neutron-proton interaction strength used in collective models. Extension of these properties are shown to account for anomolous states in ^102-6 Pd and ¹⁴⁶ Gd

[en] Complex fragments observed in intermediate energy heavy ion reactions are shown to arise from the binary decay of a compound nucleus formed in a complete or incomplete fusion process

[en] Momentum dependent interactions may play an important role in the early stages of heavy ion collisions, where large relative momenta are presented. To study the effect of such interactions in a schematic but rather instructive way, the authors propose a generalization of the concept of the nuclear equation of state, which is more appropriate in the situation of two interpenetrating nuclei: As an additional macroscopic (thermodynamic) variable they introduce the relative collective flow of the two nuclei. The dependence of the equation of state on this new variable is investigated. They then investigate the influence of momentum dependent interactions as well as the influence of in medium corrections to the nucleon-nucleon cross sections in the framework of the microscopic quantum molecular dynamics model of heavy ion collisions. Within this model fragment formation can be described in a consistent way. The transverse momentum transfer of medium heavy fragments is an observable of high sensitivity to the equation of state even if in-medium corrections are taken into account. The authors show that medium heavy fragments (A=5-15) exhibit the largest transverse momentum per nucleon with a high correlation in the scattering plane. The time structure of fragment formation is studied in detail

[en] The authors discuss angular-momentum distributions σ_l for the compound nucleus ¹⁶⁴Yb deduced from measurements of γ-ray multiplicity for all significant evaporation residues from fusion of ⁶⁴Ni and ¹⁰⁰Mo and ¹⁶O + ¹⁴⁸Sm. At the lowest bombarding energies the σ_l extend to higher l values than do predictions that include coupling of the principal inelastic channels, even if the coupling strengths are increased to match the experimental excitation function. Likewise, σ _l from an energy-dependent real potential fitted to the excitation function fails to reproduce the experimental σ _l distribution. No effects attributed to superdeformation were observed

[en] Preequilibrium emission (PE) of nucleons has been studied with semiclassical PE models based on the intranuclear nucleon-nucleon collision picture for two limiting cases. For the nucleon induced reactions ^204-208Pb(p,xn) the influence of shell effects on the 2p1h state density at the onset of equilibration and the selectivity of the PE mode to this subset of states is demonstrated. For heavy ion induced reactions it is shown that the consideration of angular momentum for the injection term of the BME model influences the initial exciton number n_o resulting from a best fit to experimental spectra

[en] The authors discuss a surface-plus-window mechanism for the conversion of nuclear collective energy into internal degrees of freedom at intermediate excitation energies. This novel dissipation mechanism, which results from the long mean free path of nucleons inside a nucleus, involves interactions of either one or two nucleons with the moving nuclear surface and also, for dumbbell-like shapes encountered in heavy-ion reactions and fission, the transfer of nucleons through the window separating the two portions of the system. To illustrate the effect of surface-plus-window heavy-ion reactions, the authors present dynamical calculations for values of the dissipation strength corresponding to 27% and 100% of the Swiatecki wall-formula value, as well as for no dissipation. In addition to dynamical thresholds for compound-nucleus formation in heavy-ion reactions, their new picture describes such other phenomena as experimental mean fission-fragment kinetic energies for the fission of nuclei throughout the periodic system, enhancement in neutron emission prior to fission, short scission-to-scission times on sequential ternary fission, widths of mass and charge distributions in deep-inelastic heavy-ion reactions, and widths of isoscalar giant quadrupole and giant octupole resonances

[en] A summary of the secondary reaction experiments done with CERN W targets is given. The spontaneous fission events previously observed in Hg sources, the masses of the fissioning nuclei, the energies of the fission fragments and the value of ν , are interpreted in a consistent manner assuming that the formation of neutron-deficient superheavy isotopes is not impossible. Evidence is presented for the formation of long-lived isomeric states in neutron-deficient ²³⁶Am and ²³⁶Bk nuclei, and for abnormal particle emission. The predictions of Hartree-Fock calculations and the possibility for oblate isomeric states which may offer explanation to the experimental results are given