Asymmetric nuclear matter: The role of the isovector scalar channel

Liu, Benye; Greco, V.; Baran, V.; Colonna, M.; Toro, M. Di

doi:10.1103/physrevc.65.045201

Cited by 282 publications

(335 citation statements)

References 45 publications

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“…The justification of (2) can be given in terms of the leptodermous expansion valid for systems with a well developed surface [61][62][63] that sorts the various contributions to the binding energy of finite nuclei in terms that have transparent physical meaning. The expansion (2) can be extended to higher orders [64,65]. The secondorder symmetry energy term ∝ I 4 is not always included in the macroscopic LDM but it naturally present in the microscopic LDM expression [27].…”

Section: Liquid Drop Model From the Skyrme Energy Density Functionalmentioning

confidence: 99%

Surface symmetry energy of nuclear energy density functionals

et al. 2011

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We study the bulk deformation properties of the Skyrme nuclear energy density functionals. Following simple arguments based on the leptodermous expansion and liquid drop model, we apply the nuclear density functional theory to assess the role of the surface symmetry energy in nuclei. To this end, we validate the commonly used functional parametrizations against the data on excitation energies of superdeformed band-heads in Hg and Pb isotopes, and fission isomers in actinide nuclei. After subtracting shell effects, the results of our self-consistent calculations are consistent with macroscopic arguments and indicate that experimental data on strongly deformed configurations in neutron-rich nuclei are essential for optimizing future nuclear energy density functionals. The resulting survey provides a useful benchmark for further theoretical improvements. Unlike in nuclei close to the stability valley, whose macroscopic deformability hangs on the balance of surface and Coulomb terms, the deformability of neutron-rich nuclei strongly depends on the surface-symmetry energy; hence, its proper determination is crucial for the stability of deformed phases of the neutronrich matter and description of fission rates for r-process nucleosynthesis.

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Section: Liquid Drop Model From the Skyrme Energy Density Functionalmentioning

confidence: 99%

Surface symmetry energy of nuclear energy density functionals

et al. 2011

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“…In [7] it was found that σ * nn is smaller than that of σ * pp since the effective neutron mass in neutronrich matter is smaller than that of proton after considering the contribution of δ meson [8].…”

Section: Introductionmentioning

confidence: 99%

Medium modifications of the nucleon–nucleon elastic cross section in neutron-rich intermediate energy HICs

Li¹,

Li²,

Soff³

et al. 2006

J. Phys. G: Nucl. Part. Phys.

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Several observables of unbound nucleons which are to some extent sensitive to the medium modifications of nucleon-nucleon elastic cross sections in neutron-rich intermediate energy heavy ion collisions are investigated. The splitting effect of neutron and proton effective masses on cross sections is discussed. It is found that the transverse flow as a function of rapidity, the Q zz as a function of momentum, and the ratio of halfwidths of the transverse to that of longitudinal rapidity distribution R t/l are very sensitive to the medium modifications of the cross sections. The transverse momentum distribution of correlation functions of two-nucleons does not yield information on the in-medium cross section.

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“…Based on the QHD theory, with a similar effective Lagrangian density [6,17,18], the main uncertainty of the density dependence of the symmetry energy results from the uncertainties of the density-dependent coupling strengths of various meson-baryon interactions, especially that of ρ − N and δ − N interactions [6]. Also, in forthcoming experiments at the Rare Isotope Accelerator (RIA) laboratory (USA) and at the new international accelerator facility FAIR (Facility for Antiproton and Ion Research) at the Gesellschaft für Schwerionenforschung (GSI, Germany), more neutron-rich beams are planned to be adopted, and hence call for further theoretical studies on isospin-dependent HICs in the intermediate energy region.…”

Section: Introductionmentioning

confidence: 99%

Probing the density dependence of the symmetry potential in intermediate-energy heavy ion collisions

Li¹,

Li²,

Soff³

et al. 2005

J. Phys. G: Nucl. Part. Phys.

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Based on the ultrarelativistic quantum molecular dynamics (UrQMD) model, the effects of the density-dependent symmetry potential for baryons and of the Coulomb potential for produced mesons are investigated for neutron-rich heavy ion collisions at intermediate energies. The calculated results of the ∆ − /∆ ++ and π − /π + production ratios show a clear beam-energy dependence on the density-dependent symmetry potential, which is stronger for the π − /π + ratio close to the pion production threshold. The Coulomb potential of the mesons changes the transverse momentum distribution of the π − /π + ratio significantly, though it alters only slightly the π − and π + total yields. The π − yields, especially at midrapidity or at low transverse momenta and the π − /π + ratios at low transverse momenta, are shown to be sensitive probes of the density-dependent symmetry potential in dense nuclear matter. The effect of the density-dependent symmetry potential on the production of both, K 0 and K + mesons, is also investigated. † DFG Mercator Guest Professor.

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Asymmetric nuclear matter: The role of the isovector scalar channel

Cited by 282 publications

References 45 publications

Surface symmetry energy of nuclear energy density functionals

Surface symmetry energy of nuclear energy density functionals

Medium modifications of the nucleon–nucleon elastic cross section in neutron-rich intermediate energy HICs

Probing the density dependence of the symmetry potential in intermediate-energy heavy ion collisions

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