Probing the symmetry energy and the degree of isospin equilibrium

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

DOI:https://doi.org/10.1103/PhysRevC.73.051601· OSTI ID:20771516

Qingfeng, Li ^[1]; Zhuxia, Li ^[2]; Stoecker, Horst ^[1]

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1. Frankfurt Institute for Advanced Studies (FIAS), Johann Wolfgang Goethe-Universitaet, Max-von-Laue-Str. 1, D-60438 Frankfurt (Germany)
2. China Institute of Atomic Energy, P.O. Box 275 (18), Beijing 102413 (China)

The rapidity dependence of the single and double neutron-to-proton ratios of nucleon emission from isospin-asymmetric but mass-symmetric reactions Zr+Ru and Ru+Zr at the energy range 100A{approx}800A MeV and impact parameter range 0{approx}8 fm is investigated. The reaction system with isospin asymmetry and mass symmetry has the advantage of simultaneously showing the dependence on symmetry energy and the degree of the isospin equilibrium. We find that the beam-energy and impact-parameter dependences of the slope parameter of the double neutron-to-proton ratio (F{sub D}) as a function of rapidity are quite sensitive to the density dependence of symmetry energy, especially at energies E{sub b}{approx}400A MeV and reduced impact parameters around 0.5. Here, the symmetry energy effect on F{sub D} is enhanced, as compared to the single neutron-to-proton ratio. The degree of equilibrium with respect to isospin (isospin mixing) in terms of F{sub D} is addressed, and its dependence on symmetry energy is also discussed.

• OSTI ID: 20771516
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 5 Vol. 73; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ASYMMETRY
EQUILIBRIUM
HEAVY ION REACTIONS
IMPACT PARAMETER
ISOSPIN
MEV RANGE
NEUTRONS
PARTICLE RAPIDITY
PROTONS
RUTHENIUM ISOTOPES
SYMMETRY
ZIRCONIUM ISOTOPES