Bifurcations in dissipative fermionic dynamics

International Symposium on Entrance Channel Effect on the Reaction Mechanism in Heavy Ion Collisions

Napolitani, Paolo^1 ; Colonna, Maria^2 ; Prima, Mariangela Di^2

IPN, CNRS/IN2P3, Université Paris-Sud 11, 91406 Orsay cedex, France^1

INFN-LNS, Laboratori Nazionali Del Sud, 95123 Catania, Italy^2

关键词: Boltzmann theory;    Dilute system;    Formation mechanism;    Heavy ion collision;    Langevin equation;    Large amplitude;    Multifragmentation;    Three dimensions;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/515/1/012014/pdf
DOI  :  10.1088/1742-6596/515/1/012014

来源: IOP

【 摘 要 】

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.