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在40MeV/u时¹¹²Sn+¹¹²Sn和¹²⁴Sn+¹²⁴Sn中多重碎裂的同位旋效应

Isospin Effects on Multifragmentation in Reactions of ¹¹² Sn + ¹¹² Sn and ¹²⁴ Sn + ¹²⁴ Sn at 40MeV/u

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【Author】 ZHANG FengShou;CHEN LieWen;MING ZhaoYu;ZHU ZhiYuan (Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000, China ) (Institute of Modern Physics, The Chinese Academy of Sciences, Lanzhou 730000, China ) (Shan

【机构】兰州重离子加速器国家实验室原子核理论研究中心!兰州730000 中国科学院近代物理研究所兰州730000 中国高等科学技术中心北京100080；兰州重离子加速器国家实验室原子核理论研究中心!兰州730000 中国科学院近代物理研究所!兰州730000；兰州重离子加速器国家实验室原子核理论研究?；

【摘要】利用同位旋相关的量子分子动力学模型，研究了^１１２Ｓｎ＋^１１２Ｓｎ和^１２４Ｓｎ＋ ^１２４Ｓｎ两个反应系统在入射能量Ｅ＝４０ＭｅＶ／ｕ时的多重碎裂。计算结果能与实验值定性符合。观察到两个反应系统中，中等质量碎片多重性、中子多重性、荷电粒子多重性与轻荷电粒子多重性之间的关联存在着明显的差别。另外，通过与膨胀蒸发源模型及同位旋相关的渗透模型分析结果的比较，发现这种差别主要是由同位旋相关的反应动力学所造成的。更多还原

【Abstract】 Within the framework of an IQMD model, multifragmentation in reactions of ¹¹²Sn + ¹¹² Sn and ¹²⁴ Sn+ ¹²⁴Sn at 40MeV/u is investigated. The calculated results are in qualitative agreement with the experimental data. Sighficantly different scalings of the mean IMF multiplicties with neutron, charged-particle, light charged-particle multiplicities, and Z_bound are observed for the two reactions. In addition, Comparing with the results of expanding evaporating source model and an isospin-dependent percolation model, it is found that the isospin dependence of multifragmentation mainly results from the isospin dependent reaction dynamics.更多还原