Isospin-dependent properties of asymmetric nuclear matter in relativistic mean field models

Journal Article · Thu Nov 15 00:00:00 EST 2007 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.76.054316· OSTI ID:21067897

Liewen, Chen ^[1]; Ko, C M ^[2]; Baoan, Li ^[3]

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1. Institute of Theoretical Physics, Shanghai Jiao Tong University, Shanghai 200240 (China)
2. Cyclotron Institute and Physics Department, Texas A and M University, College Station, Texas 77843-3366 (United States)
3. Department of Physics, Texas A and M University-Commerce, Commerce, Texas 75429-3011 (United States)

Using various relativistic mean-field models, including nonlinear ones with meson field self-interactions, models with density-dependent meson-nucleon couplings, and point-coupling models without meson fields, we have studied the isospin-dependent bulk and single-particle properties of asymmetric nuclear matter. In particular, we have determined the density dependence of nuclear symmetry energy from these different relativistic mean-field models and compared the results with the constraints recently extracted from analyses of experimental data on isospin diffusion and isotopic scaling in intermediate energy heavy-ion collisions as well as from measured isotopic dependence of the giant monopole resonances in even-A Sn isotopes. Among the 23 parameter sets in the relativistic mean-field model that are commonly used for nuclear structure studies, only a few are found to give symmetry energies that are consistent with the empirical constraints. We have also studied the nuclear symmetry potential and the isospin splitting of the nucleon effective mass in isospin asymmetric nuclear matter. We find that both the momentum dependence of the nuclear symmetry potential at fixed baryon density and the isospin splitting of the nucleon effective mass in neutron-rich nuclear matter depend not only on the nuclear interactions but also on the definition of the nucleon optical potential.

• OSTI ID: 21067897
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 76, Issue 5; Other Information: DOI: 10.1103/PhysRevC.76.054316; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ASYMMETRY
COUPLING
DENSITY
EFFECTIVE MASS
GIANT RESONANCE
HEAVY ION REACTIONS
ISOSPIN
MEAN-FIELD THEORY
MESON-NUCLEON INTERACTIONS
MESONS
MONOPOLES
NEUTRONS
NONLINEAR PROBLEMS
NUCLEAR MATTER
NUCLEAR STRUCTURE
POTENTIALS
RELATIVISTIC RANGE
SYMMETRY
TIN ISOTOPES