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

Díaz-Alonso, J.; Mornas, L.

doi:10.1016/s0375-9474(97)00637-4

Cited by 5 publications

(10 citation statements)

References 70 publications

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“…1 Our claim is that RPA may give important effects, both quantitative and qualitative, and has to be considered in many-body calculations of nuclear matter. As a matter of fact, it was shown [13] that RPA corrections give rise to a modification of the in-medium cross section of the same order of magnitude as Brueckner ones, and compatible with experimental data available so far. Other examples are the reduction of neutrino opacities in neutron star matter from RPA corrections of the NN interaction [14,15] and the measurement of the electromagnetic response function in quasielastic electron scattering experiments [16].…”

Section: Introductionsupporting

confidence: 84%

Nucleon–nucleon effective potential in dense matter including rho-meson exchange

2002

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We obtain the RPA summed one-meson exchange potential between nucleons in symmetric nuclear matter at zero temperature, from a model which includes ρ, σ, ω and π mesons. The behavior of rho mesons inside the medium is first discussed using different schemes to extract a finite contribution from the vacuum polarization. These schemes give qualitatively different results for the in-medium rho mass. The results are discussed in connection with the non-renormalizability of the model. We next study the modified potential as density increases. In the intermediate distance range, it is qualitatively modified by matter and vacuum effects. In the long-distance range (r > 2 fm), one observes the presence of oscillations, which are not present in free-space. Features on this distance range are insensitive to the renormalization scheme.

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Section: Introductionsupporting

confidence: 84%

Nucleon–nucleon effective potential in dense matter including rho-meson exchange

2002

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“…Indeed, the angular dependence of the cross section can be modified by the in-medium effects, and this modification is model dependent (e.g. Refs [40,41,51]). …”

Section: ρN−ρp ρN+ρpmentioning

confidence: 99%

“…Refs [51]). To consider the uncertainty of the in-medium differential cross section, three commonly used differential NN cross sections in transport models are adopted and given as follows:…”

Section: Model Descriptions and Observablesmentioning

confidence: 99%

Influence of differential elastic nucleon-nucleon cross section on stopping and collective flow in heavy-ion collisions at intermediate energies

Wang

Guo

et al. 2016

Phys. Rev. C

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A 347, 173 (1994)], as well as the isotropic differential cross section, within the newly updated version of the ultrarelativistic quantum molecular dynamics (UrQMD) model, the influence of the differential elastic NN cross section on various observables (e.g., nuclear stopping, both the rapidity and transverse-velocity dependence of the directed and elliptic flows) in Au+Au collisions at beam energies 150, 250, 400, and 800 MeV/nucleon is investigated. By comparing calculations with those three differential cross sections, it is found that the nuclear stopping power, the directed and elliptic flows are affected to some extent by the differential cross sections, and the impact of differential cross section on those observables becomes more visible as the beam energy increases. The effect on the elliptic flow difference v n 2 -v H 2 and ratio v n 2 /v H 2 of neutrons versus hydrogen isotopes (Z = 1), which have been used as sensitive observables for probing nuclear symmetry energy at high densities, is weak.

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“…for the mixing, longitudinal and transverse parts. The explicit expression for the polarizations and a study of the dispersion relations can found in [11,13]. Besides the σ and longitudinal and transverse ω branches, there is a zero sound branch in the mixed σ-ω mode.…”

Section: The Modelmentioning

confidence: 99%

“…The concern of our present work is to release this assumption. We refer the reader to [11] for details on the formalism and only recall here the main formulaes.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of nucleon-nucleon cross section in sidewards flowing nuclear matter through zero sound mode excitation

Díaz-Alonso¹,

Mornas²

1998

Physics Letters B

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We investigate the modification induced on the nucleon-nucleon cross section by screening of the interaction inside nuclear matter. The interaction is described by the relativistic one boson exchange of σ, ω and π mesons. Medium effects enter as loop corrections to the meson propagators and are characterized not only by density, but also by temperature and velocity with respect to the center of mass of the collision. The cross section displays peaks for some specific values of the velocity, corresponding to the excitation of zero-sound modes of the longitudinal ω field. The enhancement factor amounts to about 1.5 under reasonable conditions. It increases with density and is reduced at finite temperature. These findings may have verifiable consequences on the angular dependence of the measurable secondary particle distributions.

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

Cited by 5 publications

References 70 publications

Nucleon–nucleon effective potential in dense matter including rho-meson exchange

Nucleon–nucleon effective potential in dense matter including rho-meson exchange

Influence of differential elastic nucleon-nucleon cross section on stopping and collective flow in heavy-ion collisions at intermediate energies

Enhancement of nucleon-nucleon cross section in sidewards flowing nuclear matter through zero sound mode excitation

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