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On the Origin of the Elliptic Flow and its Dependence on the Equation of State in Heavy Ion Reactions at Intermediate Energies

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arxiv 1611.07500 v2 pith:OI3VIUME submitted 2016-11-22 nucl-th

classification nucl-th
keywords dependenceellipticflowparticlesbeencalculationsdensitydifferent
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Recently it has been discovered that the elliptic flow, v2, of composite charged particles emitted at midrapidity in Heavy-Ion collisions at intermediate energies shows the strongest sensitivity to the Nuclear Equation of State (EoS) which has been observed up to now within a microscopic model. This dependence on the nuclear EoS is predicted by Quantum Molecular Dynamics (QMD) calculations [1] which show as well that the absorption or rescattering of in-plane emitted particles by the spectator matter is not the main reason for the EoS dependence of the elliptic flow at mid-rapidity but different density gradients (and therefore different forces) in the direction of the impact parameter (x-direction) as compared to the direction perpendicular to the reaction plan (y-direction), caused by the presence of the spectator matter. The stronger density gradient in y-direction accelerates the particles more and creates therefore a negative v2. When using a soft momentum dependent EoS, the QMD calculations reproduce the experimental results.

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Cited by 6 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Effects of light-cluster degrees of freedom on collective flows in heavy-ion collisions at FOPI energies

    nucl-th 2026-08 conditional novelty 6.0 of 10

    Explicitly propagating light clusters in a Boltzmann-Uehling-Uhlenbeck transport model substantially modifies predicted proton v1-v4 flows at low FOPI energies (120-400 A MeV) but not above 600 A MeV.

  2. Is the coexistence of strange quark stars and hadronic stars favored by astrophysical data? A Bayesian analysis

    nucl-th 2026-06 unverdicted novelty 6.0 of 10

    Bayesian analysis of astrophysical and laboratory data favors the two-families scenario of coexisting hadronic and strange quark stars over the one-family scenario.

  3. Bayesian analysis of properties of nuclear matter with the FOPI experimental data

    nucl-th 2025-09 conditional novelty 6.0 of 10

    Bayesian fits to FOPI Au+Au flow and stopping data yield m*/m0 around 0.78-0.88 and F around 0.75-0.88, while K0 remains unconstrained.

  4. Probing of EoS with clusters and hypernuclei

    nucl-th 2025-07 conditional novelty 5.0 of 10

    Using the PHQMD transport model, the paper shows that a soft momentum-dependent nuclear equation of state reproduces most STAR 3 GeV Au+Au data for baryons, clusters and hypernuclei, while a hard equation of state giv...

  5. Systematic study of flow of protons and light clusters in intermediate-energy heavy-ion collisions with momentum-dependent potentials

    nucl-th 2024-11 unverdicted novelty 5.0 of 10

    PHQMD simulations with momentum-dependent potentials show that a soft momentum-dependent EoS calibrated to pA data reproduces experimental proton and cluster flows at midrapidity better than static EoS variants, while...

  6. Study on the equation-of-state with light clusters and hypernuclei

    nucl-th 2025-09 conditional novelty 1.0 of 10

    A review of transport-model constraints on the nuclear equation of state from flow of protons, light clusters, and hypernuclei, concluding that soft momentum-dependent potentials fit few-GeV data best.

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