[en] This book contains the proceedings of the winter college on fundamental nuclear physics. Topics include the following: nuclear structures; nuclear reactions; statistical mechanics and relation to nuclear dynamics; theory of strong interactions; nuclear structure; nuclear dynamics at law energy; nuclear dynamics at intermediate energy; and nuclear dynamics at high energy

[en] Short communication

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[en] We study equilibrium and non-equilibrium features of complex fragment production in medium-energy heavy-ion collisions. We consider first statistical sequential emission from equilibrated primary sources formed in the entrance-channel dynamics. The inputs of cascade calculations are derived from a suitable clustering procedure at some carefully fixed equilibrium time. Large pre-equilibrium dissipation is revealed. Applications are shown to the reactions ⁸⁴Kr+²⁷Al at 34.4 MeV/u, and ¹³⁹La+²⁷Al and ¹³⁹La+⁶³Cu at 55 MeV/u beam energies. Absolute comparisons with experiments show a quite good overall agreement. Some discrepancies revealed at higher energies, for high multiplicity events and when a larger excitation energy is available, appear as a signature of the onset of a direct multifragmentation mechanism. A microscopic study of the nuclear-matter phase diagram in the participant zone seems to relate this multifragment emission to dynamical instabilities. (orig.)

[en] The effect of one- and two-body dissipation on the damping of giant dipole resonances (GDR's) is studied in a semiclassical approach solving a Vlasov equation with a collision relaxation time. The latter is microscopically evaluated from the equilibration of a distorted momentum distribution in a kinetic approach. Temperature effects are introduced in the initial distribution function and in Pauli blocking rearrangement in the path to equilibration. Particle emission is also computed in the same microscopic picture. Without free parameters a good agreement with data is obtained for GDR's on the ground state. For collective vibration built on excited states we get a dramatic increase of the widths due to the enhancement of nucleon-nucleon (NN) collisions. The saturation observed in some experiments is explained as due to the competition of particle evaporation which cools down the system. The transition to first-sound modes is ruled out for the persistence of long-nucleon mean free paths at relatively high temperatures

[en] The decay of hot nuclei formed in lanthanum-induced reactions utilizing inverse kinematics has been studied from E/A = 35 to 55 MeV. At each bombarding energy studied, the probability for the multiple emission of complex fragments has been found to be independent of target. Global features (total charge, source velocity) of the reaction La + Al at E/A = 45 MeV have been reproduced by coupling a dynamical model to study the collision stage of the reaction to a statistical model of nuclear decay

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[en] In this report we focus on specific features associated with the Giant Dipole Resonance (GDR) γ-ray emission from deformed long-living nuclear systems. Solving numerically the Vlasov equation, we follow the fusion path for entrance channels with different mass-asymmetry in low energy heavy ion collisions just above the fusion threshold. We observe the formation of long-living deformed compound nuclei in the more symmetric cases. We show that very important features such as the energy and the angular correlation of the emitted γ's are characteristic effects of the emission from such deformed systems. For charge-asymmetric channels we reveal the presence of a new 'direct' dipole mode, related to the charge equilibration dynamics. The relative observation in medium energy dissipative collisions can bring some new independent information on the temperature dependence of the GDR spreading width. (authors)