56 research outputs found
In-medium NN cross sections determined from stopping and collective flow in intermediate-energy heavy-ion collisions
In-medium nucleon-nucleon scattering cross sections are explored by comparing
results of quantum molecular dynamics simulations to data on stopping and on
elliptic and directed flow in intermediate-energy heavy-ion collisions. The
comparison points to in-medium cross sections which are suppressed at low
energies but not at higher energies. Positive correlations are found between
the degree of stopping and the magnitudes of elliptic and directed flows.Comment: 11 pages, 4 figures, to be published on PR
Probing the density dependence of the symmetry potential with peripheral heavy-ion collisions
The peripheral heavy-ion collisions of at are studied by means of the Improved Quantum Molecular Dynamics
Model(ImQMD). It is shown that the slope of the average N/Z ratio of emitted
nucleons vs impact parameters for these reactions is very sensitive to the
density dependence of the symmetry energy. Our study also shows that the yields
of and decrease with impact parameters and slope of the yield
of vs impact parameters as well as the ratio of Y()/Y()
depend on the symmetry potential strongly for peripheral heavy-ion collisions.Comment: 10 pages,6 figures, accepted by Phys.Rev.
Properties of nuclear matter from macroscopic-microscopic mass formulas
Based on the standard Skyrme energy density functionals together with the
extended Thomas-Fermi approach, the properties of symmetric and asymmetric
nuclear matter represented in two macroscopic-microscopic mass formulas:
Lublin-Strasbourg nuclear drop energy (LSD) formula and Weizs\"acker-Skyrme
(WS*) formula, are extracted through matching the energy per particle of finite
nuclei. For LSD and WS*, the obtained incompressibility coefficients of
symmetric nuclear matter are MeV and MeV,
respectively. The slope parameter of symmetry energy at saturation density is
MeV for LSD and MeV for WS*, respectively, which
is compatible with the liquid-drop analysis of Lattimer and Lim [ApJ.
\textbf{771}, 51 (2013)]. The density dependence of the mean-field isoscalar
and isovector effective mass, and the neutron-proton effective masses splitting
for neutron matter are simultaneously investigated. The results are generally
consistent with those from the Skyrme Hartree-Fock-Bogoliubov calculations and
nucleon optical potentials, and the standard deviations are large and increase
rapidly with density. A better constraint for the effective mass is helpful to
reduce uncertainties of the depth of the mean-field potential.Comment: 5 figures, to appear in Phys. Lett.
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