Bifurcations in dissipative fermionic dynamics
arXiv:1402.4121 · doi:10.1088/1742-6596/515/1/012014
Abstract
The Boltzmann-Langevin One-Body model (BLOB), is a novel one-body transport approach, based on the solution of the Boltzmann-Langevin equation in three dimensions; it is used to handle large-amplitude phase-space fluctuations and has a broad applicability for dissipative fermionic dynamics. We study the occurrence of bifurcations in the dynamical trajectories describing heavy-ion collisions at Fermi energies. The model, applied to dilute systems formed in such collisions, reveals to be closer to the observation than previous attempts to include a Langevin term in Boltzmann theories. The onset of bifurcations and bimodal behaviour in dynamical trajectories, determines the fragment-formation mechanism. In particular, in the proximity of a threshold, fluctuations between two energetically favourable mechanisms stand out, so that when evolving from the same entrance channel, a variety of exit channels is accessible. This description gives quantitative indications about two threshold situations which characterise heavy-ion collisions at Fermi energies. First, the fusion-to-multifragmentation threshold in central collisions, where the system either reverts to a compact shape, or splits into several pieces of similar sizes. Second, the transition from binary mechanisms to neck fragmentation (in general, ternary channels), in peripheral collisions.
Conf. proc. ECHIC November 6-8, 2013 Messina (Italy)
References in corpus (4)
- Bimodal behavior of the heaviest fragment distribution in projectile fragmentation
- Bimodality: a possible experimental signature of the liquid-gas phase transition of nuclear matter
- A new approach to solve the Boltzmann-Langevin equation for fermionic systems
- New isospin e ffects in central heavy-ion collisions at Fermi energies
Cited by in corpus (4)
- Collision dynamics at medium and relativistic energies
- Frustrated fragmentation and re-aggregation in nuclei: a non-equilibrium description in spallation
- Violent Nuclear Reactions: Large-Amplitude Nuclear Dynamic Phenomena in Fermionic Systems
- Transport Model Comparison Studies of Intermediate-Energy Heavy-Ion Collisions