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采用同位旋相关的量子分子动力学模型,研究了在轰击能量为40MeV/u和100MeV/u时,112Sn+112Sn和124Sn+124Sn反应产物的同位素分布.发现在40MeV/u时,同位素分布与入射体系的同位旋密切相关;而在100MeV/u时,对这两种不同同位旋体系给出几乎相同的同位素分布.这种同位素分布的能量依赖性为研究化学不稳定性及其与力学不稳定性的竞争提供了新途径
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关键词:
- 化学不稳定性 /
- 同位旋效应 /
- 同位素分布 /
- 同位旋相关的量子分子动力学
Within the framework of isospin-dependent quantum molecular dynamics model,isotopic distributions in the reactions of 112Sn+112Sn and 124Sn+124 Sn at 40 and 100 MeV/u are investigated.It is found that the isotopic distribution has a significant isospin effect at 40 MeV/u,but the isospin effect disppears at 100 MeV/u.By investigating mechanical and chemical instabilities at different energies,we find that the energy dependence of isospin effects on isotopic distributions results from the competition between mechanical instabilities and chemical instabilities at different energies.-
Keywords:
- chemical instability /
- isospin effects /
- isotopic distributions /
- isospin-dependent quantum molecular dynamics
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