Dynamic description of ternary and quaternary splits of heavy nuclear systems in the deep-inelastic regime

Napolitani, P.; Sainte-Marie, Antonin; Colonna, M.

doi:10.1103/physrevc.100.054614

Cited by 4 publications

(3 citation statements)

References 66 publications

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“…Within a Boltzmann approach, even with the inclusion of fluctuations in an approximated form (as the case of the SMF model), fragmentation is inhibited by mean-field resilience; as a result, the configurations produced in the collision are very elongated and too hard to break. On the other hand, a description based on the BLOB approach succeeds in getting closer to the experimental results [8]. Fig.…”

Section: -From Deep Inelastic To Nuclear Jets Beyond Fermi Energy Wit...supporting

confidence: 59%

“…In terms of the same interaction which already determined the dispersion relation for the spinodal modes, we can also define a dispersion relation for the Plateau-Rayleigh modes (see ref. [8] for details). This latter describes the growth rate of a surface instability which characterises a columnar thread, which may correspond to a neck topology produced in peripheral heavy-ion collisions or in the early configuration of a very stretched system that is going to break into a stream of collimated nuclear clusters (i.e.…”

Section: -Instabilities and Related Observablesmentioning

confidence: 99%

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Interplay between surface and volume instabilities in heavy-ion collisions examined within mean-field extensions

Napolitani,

Viet,

Colonna

2022

Preprint

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In the transition from nuclear matter to finite nuclei, complex finitesize effects which characterise open systems arise, in relation with either the nuclear surface or the bulk. In addition, the non-equilibrium character of the process, typical of violent heavy-ion collisions (from Fermi energy to the intermediate-energy domain) adds up as well. The resulting dynamics is the combination of surface and volume unstable modes which trigger large-amplitude fluctuations. A rich variety of fragmentation patterns may emerge, ranging from collimated streams of nuclear clusters to the split of a stretched nuclear complex into few large fragments. They imply different conditions of density and surface tension, and result in different chronologies. Such phenomenology has been observed in experiments, but it is often difficult to recognise and disentangle the underlying types of instabilities. To draw some example, two extremely deformed nuclear systems, produced below and above Fermi energy, are chosen and followed microscopically all along their evolution within the Boltzmann-Langevin One-Body approach.

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Section: -From Deep Inelastic To Nuclear Jets Beyond Fermi Energy Wit...supporting

confidence: 59%

Section: -Instabilities and Related Observablesmentioning

confidence: 99%

Interplay between surface and volume instabilities in heavy-ion collisions examined within mean-field extensions

Napolitani,

Viet,

Colonna

2022

Preprint

Self Cite

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“…In this energy domain, the BLOB approach can describe the interplay between volume and surface instabilities below nuclear saturation density. As a consequence it is capable of describing extreme situations ranging from multiple breakups in the deep-inelastic regime [156] to the stream of clusters around Fermi energy [157].…”

Section: Fluctuations and Collective Effects At Intermediate Energymentioning

confidence: 99%

Transport Model Comparison Studies of Intermediate-Energy Heavy-Ion Collisions

Wolter,

Colonna,

Cozma

et al. 2022

Preprint

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Transport models are the main method to obtain physics information on the nuclear equation of state and in-medium properties of particles from low to relativistic-energy heavy-ion collisions. The Transport Model Evaluation Project (TMEP) has been pursued to test the robustness of transport model predictions in reaching consistent conclusions from the same type of physical model. To this end, calculations under controlled conditions of physical input and set-up were performed with various participating codes. These included both calculations of nuclear matter in a box with periodic boundary conditions, which test separately selected ingredients of a transport code, and more realistic calculations of heavy-ion collisions. Over the years, five studies have been performed within this project. In this intermediate review, we summarize and discuss the present status of the project. We also provide condensed descriptions of the 26 participating codes, which contributed to some part of the project. These include the major codes in use today. After a compact description of the underlying transport approaches, we review the main results of the studies completed so far. They show, that in box calculations the differences between the codes can be well understood and a convergence of the results can be reached. These studies also highlight the systematic differences between the two families of transport codes, known under the names of Boltzmann-Uehling-Uhlenbeck (BUU) and Quantum Molecular Dynamics (QMD) type codes. However, when the codes were compared in full heavy-ion collisions using different physical models, as recently for pion production, they still yielded substantially different results. This calls for further comparisons of heavy-ion collisions with controlled models and of box comparisons of important ingredients, like momentum-dependent fields, which are currently underway. Our evaluation studies often indicate improved strategies in performing transport simulations and thus can provide guidance to code developers. Results of transport simulations of heavy-ion collisions from a given code will have more significance if the code can be validated against benchmark calculations such as the ones summarized in this review.

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