Nuclear reactions with heavy ions

Nuclear reactions with heavy ions

Lectures will concern the study of nuclear reactions with heavy ions in the energy interval around the Coulomb barrier. At these energies, nuclear reactions are dominated by fusion and transfer processes, and are strongly influenced by the structure of the interacting nuclear systems. The course is divided in two parts, experimental and theoretical (respectively).

Andrea Vitturi: Theoretical models for heavy ion reactions around the Coulomb barrier (12 hours)

The theoretical models used to describe the different processes involving heavy ion interactions at energies around the Coulomb barrier will be discussed. In particular, microscopic models will be developed, with the aim of having links between structure aspects and dynamical aspects.

-Semiclassical description of processes involving heavy ions;

-Models for two-body reactions:quasi-elastic and transfer
a) elastic scattering, with bound and weakly-bound nuclei.  Polarization potential
b) Coulomb excitation and inelastic nuclear excitation: microscopic approaches; Excitation to continuum (break-up) in weakly-bound nuclei.  Excitation of giant and pygmy dipole states. Quadrupole and monopole giant resonances.
c) pair transfer and pairing interaction;

-Fusion reactions (in particolar, below the potential barrier)
a) coupled channel model;
b) barrier distribution;
c) fusion processes involving weakly bound systems.

Fernando Scarlassara: Experimental study of transfer and fusion reactions  (12 hours)

State-of-the art experimental techniques and perspectives with unstable beams will be discussed together with recent, important results obtained at Legnaro National Laboratory. Particular emphasis will be given to experimental problems related to the measurements of observables such as energy, mass, atomic number and cross sections for reactions with heavy ions.

-Binary reactions: quasi-elastic and transfer a) Introduction and experimental aspects;
b) Results on pair transfer.
-Fusion reaction, in particular below barrier
a)"Historical" introduction and experimental aspects;
b) Fusion in "coupled channels";
c) Deep sub-barrier fusion: the new frontier