Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2001-12-12
Phys.Rev.C65:045201,2002
Physics
Nuclear Physics
Nuclear Theory
12 pages, 10 Postscript figures
Scientific paper
10.1103/PhysRevC.65.045201
We try to single out some qualitative new effects of the coupling to the $\delta$-isovector-scalar meson introduced in a minimal way in a phenomenological hadronic field theory. Results for the equation of state ($EOS$) and the phase diagram of asymmetric nuclear matter ($ANM$) are discussed. We stress the consistency of the $\delta$-coupling introduction in a relativistic approach. New contributions to the slope and curvature of the symmetry energy and the neutron-proton effective mass splitting appear particularly interesting. A more repulsive $EOS$ for neutron matter at high baryon densities is expected. Effects on new critical properties of warm $ANM$, mixing of mechanical and chemical instabilities and isospin distillation, are also presented. The $\delta$ influence is mostly on the {\it isovectorlike} collective response. The results are largely analytical and this makes the physical meaning quite transparent. Implications for nuclear structure properties of drip-line nuclei and for reaction dynamics with Radioactive Beams are finally pointed out.
Baran Václav
Colonna Maria
Greco Vincenzo
Liu Baoling
Toro Massimo Di
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