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核物质对称能和重离子碰撞中径向流阈能的同位旋效应

ISSN号：1000-3290
期刊名称：《物理学报》
时间：0
分类：O571.6[理学—粒子物理与原子核物理;理学—物理]
作者机构：[1]北京师范大学射线束技术与材料改性教育部重点实验室,北京师范大学低能核物理研究所,北京100875, [2]北京市辐射中心,北京100875, [3]兰州重离子加速器国家实验室原子核理论中心,兰州730000
相关基金：国家自然科学基金（批准号：10575012,10435020）,北京市教育委员会共建项目计划和北京师范大学科研基金资助的课题

关键词：径向膨胀流阈能, 同位旋效应, 重离子碰撞, 同位旋相关的量子分子动力学模型, threshold energy of radial flow, isospin effects, heavy ion collisions, isospin dependent quantum molecular dynamics

中文摘要：

基于同位旋相关的量子分子动力学模型，采用三种不同形式的对称势，研究了124^Sn＋124^Sn和124^Ba＋124^Ba对心碰撞时在三种不同对称势下的径向膨胀流，发现径向膨胀流阈能与所采用的对称能形式密切相关，表现出明显同位旋效应，预示着径向膨胀流阈能的同位旋相关性可作为对称能的灵敏探针．

英文摘要：

The threshold energies of radial flow in reactions of 124^ Sn ＋ 124 ^Sn and 124^ Ba ＋ 124^ Ba in central collisions are investigated within an isospin dependent quantum molecular dynamics model by using three different forms of symmetry energy. It is found that the neutron-rich system has smaller threshold energy of radial flow and its value depends strongly on the form of symmetry energy. It indicates that the threshold energy of radial flow may provide a new method to determine the symmetry energy of nuclear matter.

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