Speaker
Description
Taking as a reference the system $^{40,48}$Ca$+^{40,48}$Ca at 35 $A$MeV, recently measured at Ganil with the VAMOS-INDRA setup [1], we build a microscopic simulation of neutron and proton currents characterising nuclear systems at Fermi energies.
In particular, we focus on the combination of collective and dissipative processes occurring at midrapidity, related to drifts and fluctuations, and triggered by a sudden density drop.
We further focus on migration, the transport process which is mainly related to density perturbations and neutron-rich environments.
Along the neck, or the low-density thread of matter that forms at midrapidity, we track the evolution of fragment precursors, identified as potential ripples which might eventually emerge as individual nuclear fragments.
We then select situation where the aforementioned precursors induce the breakup of the neck and separate into fragments, possibly carrying experimentally-accessible observables.
The Boltzmann-Langevin One Body approach is well adapted to track inhomogeneity growth in two-component fermionic systems [2], handling both collective motion and dissipative regimes.
For this analysis, we employ a specifically tailored new version of such model [3] which adopts recent SAMi [4] Skyrme interactions, specifically tested on nuclear-matter properties and collective motion in neutron-rich nuclei [5], and a thorough treatment of the momentum-dependent interaction in the mean-field and in the two-body collision contribution.
- Q.Fable et al. Phys.Rev.C 106 (2022) 024605; Q.Fable et Al., Phys.Rev.C 107 (2022) 014604.
- P.Napolitani, M.Colonna, Phys.Rev.C 96 (2017) 054609.
- BLOB-11, to be released in 2026.
- X.Roca-Maza et al., Phys.Rev.C 86 (2012) 031306R; X.Roca-Maza et Al., Phys.Rev.C 87 (2013) 034301.
- H.Zheng et Al. Phys.Rev.C 94 (2016) 014313; S.Burrello et Al. Phys.Rev.C 99 (2019) 054314; L.Shvedov et Al. Phys.Rev.C 111 (2025) 014609.