Constraining the nuclear matter equation of state around twice saturation density

Févre, A. Le; Leifels, Y.; Reisdorf, W.; Aichelin, Joerg; Hartnack, C.

doi:10.1016/j.nuclphysa.2015.09.015

Cited by 145 publications

(190 citation statements)

References 65 publications

(58 reference statements)

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“…5. The preliminary results indicate a good consistency of the first two flow coefficients of protons with FOPI data [4,12,13] and are in the process of being finalized.…”

Section: Directed and Elliptic Flowsupporting

confidence: 54%

See 1 more Smart Citation

Collective flow measurements with HADES in Au+Au collisions at 1.23A GeV

Kardan

2018

Proceedings of Critical Point and Onset of Deconfinement — PoS(CPOD2017)

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HADES has a large acceptance combined with a good mass-resolution and therefore allows the study of dielectron and hadron production in heavy-ion collisions with unprecedented precision. With the statistics of seven billion Au-Au collisions at 1.23A GeV recorded in 2012, the investigation of higher-order flow harmonics is possible. At the BEVALAC and SIS18 directed and elliptic flow has been measured for pions, charged kaons, protons, neutrons and fragments, but higher-order harmonics have not yet been studied. They provide additional important information on the properties of the dense hadronic medium produced in heavy-ion collisions. We present here a high-statistics, multi-differential measurement of v 1 and v 2 for protons in Au+Au collisions at 1.23A GeV.

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“…5. The preliminary results indicate a good consistency of the first two flow coefficients of protons with FOPI data [4,12,13] and are in the process of being finalized.…”

Section: Directed and Elliptic Flowsupporting

confidence: 54%

“…To achieve a good understanding of these phenomena, flow observables are deduced and compared with model calculations to constrain the nuclear Equation-of-State (EoS) [3,4]. The understanding of the EoS of dense matter is of great importance for the investigation of supernovae and compact stars [5].…”

Section: Introductionmentioning

confidence: 99%

Collective flow measurements with HADES in Au+Au collisions at 1.23A GeV

Kardan

2018

Proceedings of Critical Point and Onset of Deconfinement — PoS(CPOD2017)

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“…It is compatible with the conclusions reached by Le Fèvre et al in their study of the symmetric matter EoS, based on FOPI elliptic-flow data and calculations with the Isospin Quantum Molecular Dynamics transport model [44]. For 197 Au+ 197 Au collisions at 400 MeV/nucleon, the broad maximum of the force-weighted density defined by the authors is spread over the density range 0.8 < ρ/ρ 0 < 1.6.…”

Section: Sensitivity To Densitysupporting

confidence: 91%

Symmetry energy and density

Trautmann¹,

Cozma²,

Russotto³

2016

Proceedings of 54th International Winter Meeting on Nuclear Physics — PoS(BORMIO2016)

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The nuclear equation-of-state is a topic of highest current interest in nuclear structure and reactions as well as in astrophysics. In particular, the equation-of-state of asymmetric matter and the symmetry energy representing the difference between the energy densities of neutron matter and of symmetric nuclear matter are not sufficiently well constrained at present. The density dependence of the symmetry energy is conventionally expressed in the form of the slope parameter L describing the derivative with respect to density of the symmetry energy at saturation. Results deduced from nuclear structure and heavy-ion reaction data are distributed around a mean value L = 60 MeV. Recent studies have more thoroughly investigated the density range that a particular observable is predominantly sensitive to. Two thirds of the saturation density is a value typical for the information contained in nuclear-structure data. Higher values exceeding saturation have been shown to be probed with meson production and collective flows at incident energies in the range of up to about 1 GeV/nucleon.From the measurement of the elliptic-flow ratio of neutrons with respect to light charged particles in recent experiments at the GSI laboratory, a new more stringent constraint for the symmetry energy at suprasaturation density has been deduced. It confirms, with a considerably smaller uncertainty, the moderately soft to linear density dependence of the symmetry energy previously deduced from the FOPI-LAND data. Future opportunities offered by FAIR will be discussed.

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“…A force-weighted density has been defined by Le Fèvre et al in their recent study of the equation of state of symmetric matter, based on FOPI elliptic-flow data and IQMD calculations [24]. For 197 Au+ 197 Au collisions at 400 MeV/nucleon, its broad maximum extends over densities 0.8 < ρ/ρ 0 < 1.6.…”

Section: Density Probedmentioning

confidence: 99%

“…The recent comprehensive study of charged particle flows for 197 Au+ 197 Au collisions at energies from 0.4 to 1.5 GeV/nucleon reflects a remarkable consistency in its support of a soft solution for the equation of state of symmetric matter, including momentum-dependent forces [23,24]. It provides a narrower constraint than previously available [25].…”

Section: Introductionmentioning

confidence: 99%

Results of the ASY-EOS experiment at GSI: The symmetry energy at suprasaturation density

Russotto¹,

Gannon²,

Kupny³

et al. 2016

Phys. Rev. C

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218

221

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Directed and elliptic flows of neutrons and light charged particles were measured for the reaction 197 Au+ 197 Au at 400 MeV/nucleon incident energy within the ASY-EOS experimental campaign at the GSI laboratory. The detection system consisted of the Large Area Neutron Detector LAND, combined with parts of the CHIMERA multidetector, of the ALADIN Time-of-flight Wall, and of the Washington-University Microball detector. The latter three arrays were used for the event characterization and reaction-plane reconstruction. In addition, an array of triple telescopes, KRATTA, 2 was used for complementary measurements of the isotopic composition and flows of light charged particles.From the comparison of the elliptic flow ratio of neutrons with respect to charged particles with UrQMD predictions, a value γ = 0.72 ± 0.19 is obtained for the power-law coefficient describing the density dependence of the potential part in the parametrization of the symmetry energy. It represents a new and more stringent constraint for the regime of supra-saturation density and confirms, with a considerably smaller uncertainty, the moderately soft to linear density dependence deduced from the earlier FOPI-LAND data. The densities probed are shown to reach beyond twice saturation.

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Constraining the nuclear matter equation of state around twice saturation density

Cited by 145 publications

References 65 publications

Collective flow measurements with HADES in Au+Au collisions at 1.23A GeV

Collective flow measurements with HADES in Au+Au collisions at 1.23A GeV

Symmetry energy and density

Results of the ASY-EOS experiment at GSI: The symmetry energy at suprasaturation density

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