Isospin equilibrium and non-equilibrium in heavy-ion collisions at intermediate energies
| Autor: | Zhang Feng-Shou, Ge Lingxiao, Zhang Xiaodong, Chen Lie-Wen |
|---|---|
| Rok vydání: | 1997 |
| Předmět: |
Physics
Nuclear and High Energy Physics Fusion Electric potential energy High Energy Physics::Phenomenology Nuclear Theory Fermi energy Threshold energy Nuclear physics symbols.namesake Pauli exclusion principle Fragmentation (mass spectrometry) Isospin symbols Heavy ion Atomic physics Nuclear Experiment |
| Zdroj: | Journal of Physics G: Nuclear and Particle Physics. 23:211-218 |
| ISSN: | 1361-6471 0954-3899 |
| DOI: | 10.1088/0954-3899/23/2/008 |
| Popis: | The equilibrium and non-equilibrium of the isospin degree of freedom are studied in terms of an isospin-dependent QMD model, which includes isospin-dependent symmetry energy, Coulomb energy, N - N cross sections and Pauli blocking. It is shown that there exists a transition from the isospin equilibrium to non-equilibrium as the incident energy from below to above a threshold energy in central, asymmetric heavy-ion collisions. Meanwhile, it is found that the phenomenon results from the co-existence and competition of different reaction mechanisms, namely, the isospin degree of freedom reaches an equilibrium if the incomplete fusion (ICF) component is dominant and does not reach equilibrium if the fragmentation component is dominant. Moreover, it is also found that the isospin-dependent N - N cross sections and symmetry energy are crucial for the equilibrium of the isospin degree of freedom in heavy-ion collisions around the Fermi energy. |
| Databáze: | OpenAIRE |
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