V. de la Mota

Wavelet representation of the nuclear dynamics

Abstract The study of transport phenomena in nuclear matter is addressed in a new approach named DYWAN, based on the projection methods of statistical physics and on the mathematical theory of wavelets. In this framework the derivation of the equations of motion and the resolution schemes are consistently defined, following a precise hierarchy of approximations. The latter especially rely on scales separation and on the decomposition of the information on orthogonal subspaces. Strongly compressed representations of the nuclear systems are obtained with an accurate description of the wave functions and of their antisymmetrization. The results of the approach are illustrated for the ground state description as well as for the dissipative dynamics of nuclei at intermediate energies.

Dynamics of hot rotating nuclei

Abstract The deexcitation of hot rotating nuclei is studied within a microscopic semiclassical transport formalism. This framework allows the study of the competition between the fission and evaporation channels of deexcitation, including the mean-field and two-body interactions, without shape constraint for the fission channel. As a function of initial angular momenta and excitation energies, the transitions between three regimes is analyzed [particle evaporation, binary (ternary) fussion and multifragmentation], which correspond to well-defined symmetry breakings in the inertia tensor of the system. The competition between evaporation and binary fission is studied, showing the progressive disappearance of the fission process with increasing excitation energies, up to a critical point where nuclei pass directly from evaporation to multifragmentation channels.

On the competiting role of mean-field and residual interactions in flow observables

Theoretical analyses of heavy-ion reactions are performed in the framework of the semi-classical Landau-Vlasov approach. The incident energies are investigated in the range from intermediate to low energy regimes, where transverse collective motion has been experimentally evidenced. The influence of the equation of state (E.O.S.) parameters on various collective observables is studied in relation with the action of the residual interactions. From the sensitivity to both aspects, and taking into account the experimental biases limitations, our investigation indicates that E.O.S. signatures should be more expected at energies below 100 MeV per nucleon.

Aspects of the momentum dependence of the equation of state and of the residualNNcross section, and their effects on nuclear stopping

With the semiclassical Landau-Vlasov transport model we studied the stopping observable

Towards a unified description of evaporation-residue fusion cross-sections above the barrier

R_E

Dynamical analysis of dissipative collisions between Ar and Ag nuclei in the Fermi energy domain

, the energy-based isotropy ratio, for the

Fusion excitation function revisited

^{129}

Evaporation, fission and fragmentation of hot rotating nuclei

Xe\,+\,

Spinodal instability growth in new stochastic approaches

^{120}

A dynamical description of neutron star crusts

Sn reaction at beam energies spanning 12