Interplay of anisotropies of momentum distribution and mean field in heavy-ion collisions

Simon, Christian; Danielewicz, Paweł

doi:10.1103/physrevc.87.054619

Cited by 5 publications

(6 citation statements)

References 21 publications

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“…One possibility is the lack of anisotropy in the momentum dependence, for anisotropic momentum distributions f , when employing (6)- (9). While our implementation (6)-( 9) of the MF momentum dependence allows in practice for a higher precision of calculations, than other MF parameterizations [24], it may turn out to be a handicap here. We already undertook steps, cf.…”

Section: B Elliptic Flowmentioning

confidence: 99%

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Subthreshold pion production within a transport description of central Au + Au collisions

2014

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Mapping out the equation of state (EOS) of nuclear matter is a long standing problem in nuclear physics. Recent emphasis is onto the density dependence of the symmetry energy, with experiments needing dedicated symmetry-energy observables. Towards the latter goal, we employ pBUU transport model [1] to simulate pion production in heavy ion collision (HIC). We find that the net pion yield tests the momentum dependence of nuclear mean field (MF). In exploring the sensitivity of pion observables to the symmetry energy at higher than normal densities, we find that our calculations of pion ratios contradict, at some level, predictions from both IBUU [2] and ImIQMD [3] models. We propose to employ the pion ratio in the high-energy tail of spectra in future experiments, to distinguish between different variants of high-density symmetry energy.

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Section: B Elliptic Flowmentioning

confidence: 99%

“…We already undertook steps, cf. the work of Simon and Danielewicz [24], towards implementing anisotropy without compromising calculational precision or speed.…”

Section: B Elliptic Flowmentioning

confidence: 99%

Subthreshold pion production within a transport description of central Au + Au collisions

2014

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“…[29][30][31], respectively. For 60 Ni there are three different sources of data [30,32,33] which are denoted by squares, circles and diamonds, respectively.…”

Section: Resultsmentioning

confidence: 99%

Low-energy proton capture reactions in the mass region 55–60

et al. 2015

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Low energy proton capture reactions in the mass 55-60 region are studied in a microscopic optical model. Nuclear density profile is calculated using the relativistic mean field theory. The DDM3Y interaction is folded with the theoretical density to obtain the proton-nucleus optical potential. A definite set of normalization parameters has been obtained for the concerned mass region by comparing with all available experimental data in this mass region. These parameters have been used to obtain proton capture rates for astrophysically important reactions in this mass region.

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“…She also expanded options for interplay of the density and momentum dependence in the nucleonic potentials. Christian Simon [243] and Yuanyuan Zhang [244] made theoretical advances for the sake of a greater flexibility in the energy functional, with only modest computational cost.…”

Section: Code Historymentioning

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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Interplay of anisotropies of momentum distribution and mean field in heavy-ion collisions

Cited by 5 publications

References 21 publications

Subthreshold pion production within a transport description of central Au + Au collisions

Subthreshold pion production within a transport description of central Au + Au collisions

Low-energy proton capture reactions in the mass region 55–60

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

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