Nuclear symmetry potential in the relativistic impulse approximation

Journal Article · Sun Oct 15 04:00:00 EDT 2006 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.74.044613· OSTI ID:20863871

Zenghua, Li; Hongru, Ma ^[1]; Liewen, Chen ^[1]; Ko, C M ^[2]; Baosn, 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 (United States)

Using the relativistic impulse approximation with the Love-Franey NN scattering amplitude developed by Murdock and Horowitz, we investigate the low-energy (100{<=}E{sub kin}{<=}400 MeV) behavior of the nucleon Dirac optical potential, the Schroedinger-equivalent potential, and the nuclear symmetry potential in isospin asymmetric nuclear matter. We find that the nuclear symmetry potential at fixed baryon density decreases with increasing nucleon energy. In particular, the nuclear symmetry potential at saturation density changes from positive to negative values at nucleon kinetic energy of about 200 MeV. Furthermore, the obtained energy and density dependence of the nuclear symmetry potential is consistent with those of the isospin- and momentum-dependent MDI interaction with x=0, which has been found to describe reasonably well both the isospin diffusion data from heavy-ion collisions and the empirical neutron-skin thickness of {sup 208}Pb.

• OSTI ID: 20863871
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 4 Vol. 74; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ASYMMETRY
DENSITY
DIFFUSION
HEAVY ION REACTIONS
IMPULSE APPROXIMATION
ISOSPIN
KINETIC ENERGY
LEAD 208
MEV RANGE
NEUTRONS
NUCLEAR MATTER
NUCLEAR POTENTIAL
NUCLEON-NUCLEON INTERACTIONS
RELATIVISTIC RANGE
SCATTERING AMPLITUDES
SYMMETRY