Density dependence of the symmetry energy and the equation of state of isospin asymmetric nuclear matter

Journal Article · Thu Mar 15 04:00:00 EDT 2007 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.75.034602· OSTI ID:20995134

Shetty, D V; Yennello, S J; Souliotis, G A ^[1]

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1. Cyclotron Institute, Texas A and M University, College Station, Texas 77843 (United States)

The density dependence of the symmetry energy in the equation of state of isospin asymmetric nuclear matter is studied using the isoscaling of the fragment yields and the antisymmetrized molecular dynamic calculation. It is observed that the experimental data at low densities are consistent with the form of symmetry energy, E{sub sym}{approx_equal}31.6({rho}/{rho}{sub circle}){sup 0.69}, in close agreement with those predicted by the results of variational many-body calculation. A comparison of the present result with those reported recently using the NSCL-MSU data suggests that the heavy ion studies favor a dependence of the form, E{sub sym}{approx_equal}31.6({rho}/{rho}{sub circle}){sup {gamma}}, where {gamma}=0.6-1.05. This constrains the form of the density dependence of the symmetry energy at higher densities, ruling out an extremely 'stiff' and 'soft' dependences.

• OSTI ID: 20995134
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 3 Vol. 75; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ASYMMETRY
COMPARATIVE EVALUATIONS
DENSITY
EQUATIONS OF STATE
HEAVY IONS
ISOSPIN
MANY-BODY PROBLEM
MOLECULAR DYNAMICS METHOD
NUCLEAR MATTER
SYMMETRY
VARIATIONAL METHODS