467 research outputs found
Temperature dependence of symmetry energy of finite nuclei
The temperature dependence of the symmetry energy and the symmetry free
energy coefficients of atomic nuclei is investigated in a finite temperature
Thomas-Fermi framework employing the subtraction procedure. A substantial
decrement in the symmetry energy coefficient is obtained for finite
systems,contrary to those seen for infinite nuclear matter at normal and
somewhat subnormal densities. The effect of the coupling of the surface phonons
to the nucleonic motion is also considered; this is found to decrease the
symmetry energies somewhat at low temperatures.Comment: 9 pages including 8 figures; accepted for publication in Phys. Rev.
Warm alpha-nucleon matter
The properties of warm dilute alpha-nucleon matter are studied in a
variational approach in the Thomas-Fermi approximation starting from an
effective two-body nucleon-nucleon interaction. The equation of state, symmetry
energy, incompressibility of the said matter as well as the alpha fraction are
in consonance with those evaluated from the virial approach that sets a
bench-mark for such calculations at low densities.Comment: 10 pages, 10 figures, Phys. Rev C (in press
Nuclear condensation and symmetry energy of dilute nuclear matter: an S-matrix approach
Based on the general analysis of the grand canonical partition function in
the S-matrix framework, the calculated results on symmetry energy, free energy
and entropy of dilute warm nuclear matter are presented. At a given temperature
and density, the symmetry energy or symmetry free energy of the clusterized
nuclear matter in the S-matrix formulation deviates, particularly at low
temperature and relatively higher density, in a subtle way, from the linear
dependence on the square of the isospin asymmetry parameter
, contrary to those obtained for homogeneous
nucleonic matter. The symmetry coefficients, in the conventional definition,
can then be even negative. The symmetry entropy similarly shows a very
different behavior.Comment: 8 pages, 6 figures. PRC (in press
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