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Bifurcations in dissipative fermionic dynamics

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.
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http://hal.in2p3.fr/in2p3-00956297
Contributor : Sophie Heurteau <>
Submitted on : Thursday, March 6, 2014 - 11:08:44 AM
Last modification on : Wednesday, October 14, 2020 - 4:00:18 AM

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P. Napolitani, M. Colonna, M. Di Prima. Bifurcations in dissipative fermionic dynamics. International Symposium on Entrance Channel Effect on the Reaction Mechanism in Heavy Ion Collisions, Nov 2013, Messina, Italy. pp. 012014 ⟨10.1088/1742-6596/515/1/012014⟩. ⟨in2p3-00956297⟩

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