In-medium effects in the description of heavy-ion collisions with realistic NN interactions

Khoa, Dao T.; Ohtsuka, N.; Matin, M. A.; Faessler, Amand; Huang, S.W.; Lehmann, E.; Puri, Rajeev K.

doi:10.1016/0375-9474(92)90079-y

Cited by 109 publications

(111 citation statements)

References 29 publications

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“…We mention here, as a non-exhaustive sample, the work of Klakow et al [4] or Alm et al [8] on BUU codes, of Khoa et al [9] on a QMD code, or of Tanaka et al [54] with the antisymmetrized AMD code.…”

Section: Comparison With Experimental Constraintsmentioning

confidence: 99%

“…It is therefore not possible to disentangle completely the effects coming from the equation of state or from a reduced cross section. It has lately been found by several authors, from BUU [4,5,6,7,8] as well as QMD [9] or AMD [10] calculations, that a lower cross section in the medium is favoured by a detailed analysis of the transverse flow. Moreover, the cross section is an essential parameter in the calculation of transport coefficients and the knowledge of its screened behavior allows the determination of these coefficients as functions of the thermodynamical state.…”

Section: (1) Introductionmentioning

confidence: 99%

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Screening effects on the elastic nucleon-nucleon cross section in relativistic nuclear matter

Díaz-Alonso¹,

Mornas²

1998

Nuclear Physics A

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We investigate the screening effects on the nucleon-nucleon elastic cross section inside nuclear matter at zero and finite temperature. The N-N interaction is described phenomenologically via meson exchanges (σ, π and ω) in the framework of a relativistic lagrangian model. The expressions for the in-medium meson propagators, which take into account the effects of matter polarization and renormalized vacuum polarization, are used in the calculation of the various meson contributions to the total cross section in the one-boson exchange approximation. The final expressions allow a satisfactory fit of the Coulomb substracted proton-proton cross section data in vacuum. At finite density or temperature the cross section is reduced as compared to the vacuum values and compatible with the existing experimental constraints. At high density the p-p differential cross section gets increasingly forward and backward peaked. The σ-ω mixing plays a key role in the understanding of the results.

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Section: Comparison With Experimental Constraintsmentioning

confidence: 99%

Section: (1) Introductionmentioning

confidence: 99%

Screening effects on the elastic nucleon-nucleon cross section in relativistic nuclear matter

Díaz-Alonso¹,

Mornas²

1998

Nuclear Physics A

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“…For the case of kinetic energy spectra a conservative value for this upper limit must not be significantly larger than the kinetic energy of pions in pionic atoms, limiting it to values as low as [20][21][22][23][24][25][26][27][28][29][30] MeV. This ensures that uncertainties in the energy dependent part of the pion potential are largely removed.…”

Section: Constraining the Symmetry Energymentioning

confidence: 99%

“…Heavy-ion collision dynamics is simulated using an upgraded version [15] of the Tübingen quantum molecular dynamics Model (QMD) transport model [23,24] which provides a semiclassical framework for the description of such reactions and accounts for relevant quantum aspects such as stochastic scattering and Pauli blocking of nucleons. It includes the production of all nucleonic resonances with masses below 2 GeV, in total 11 N * and 10 ∆ resonances.…”

Section: The Model a The Transport Modelmentioning

confidence: 99%

Constraining the density dependence of the symmetry energy using the multiplicity and average pT ratios of charged pions

Cozma

2017

Phys. Rev. C

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The charged pion multiplicity ratio in intermediate energy heavy-ion collisions, a probe of the density dependence of symmetry energy above the saturation point, has been proven in a previous study to be extremely sensitive to the strength of the isovector ∆(1232) potential in nuclear matter. As there is no knowledge, either from theory or experiment, about the magnitude of this quantity, the extraction of constraints on the slope of the symmetry energy at saturation by using exclusively the mentioned observable is hindered at present. It is shown that, by including the ratio of average pT of charged pions pin the list of fitted observables, the noted problem can be circumvented. A realistic description of this observable requires accounting for the interaction of pions with the dense nuclear matter environment by the incorporation of the so called S-wave and P -wave pion optical potentials. This is performed within the framework of a quantum molecular dynamics transport model that enforces the conservation of the total energy of the system. It is shown that constraints on the slope of the symmetry energy at saturation density and the strength of the ∆(1232) potential can be simultaneously extracted. A symmetry energy with a value of the slope parameter L > 50 MeV is favored, at 1σ confidence level, from a comparison with published FOPI experimental data. A precise constraint will require experimental data more accurate than presently available, particularly for the charged pion multiplicity ratio, and better knowledge of the density and momentum dependence of the pion potential for the whole range of these two variables probed in intermediate energy heavy-ion collisions.

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“…The K R is an indicator of local equilibrium because it depends on the local position r . The second quantity is the anisotropy ratio which is defined as [3,18,26]:…”

Section: -P6mentioning

confidence: 99%

On the stability of fragments and thermalization achieved in neutron-rich heavy-ion collisions

Kaur

2014

EPJ Web of Conferences

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Abstract. Using the isospin-dependent quantum molecular dynamics model, we study the stability of the fragments and the thermalization achieved in the collision of a neutronrich colliding pair at energies where the maximum production of intermediate mass fragments (E max c.m. ) occurs. In particular, we check the stability of fragments through the persistence coefficient and gain term and information about the thermalization and stopping is obtained via the relative momentum, anisotropy ratio, and rapidity distribution. Our findings show a weak dependence of these quantities on the neutron content of the colliding pair.

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In-medium effects in the description of heavy-ion collisions with realistic NN interactions

Cited by 109 publications

References 29 publications

Screening effects on the elastic nucleon-nucleon cross section in relativistic nuclear matter

Screening effects on the elastic nucleon-nucleon cross section in relativistic nuclear matter

Constraining the density dependence of the symmetry energy using the multiplicity and average pT ratios of charged pions

On the stability of fragments and thermalization achieved in neutron-rich heavy-ion collisions

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