| 从晕中子核引起核反应中提取对称势 |
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| 引用本文： | 刘建业,肖国青,左维,李希国. 从晕中子核引起核反应中提取对称势[J]. 中国物理 C, 2007, 31(2): 150-154 |
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| 作者姓名： | 刘建业 肖国青 左维 李希国 |
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| 作者单位： | [1]中国科学院近代物理研究所,兰州730000 [2]天水师范学院数理信息学院基础物理研究所,天水741000 [3]重离子加速器国家实验室原子核理论中心,兰州730000 |
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| 基金项目： | 国家重点基础研究发展计划(973计划) , 国家自然科学基金 , 国家自然科学基金 , 中国科学院知识创新工程项目 |
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| 摘 要： | 利用同位旋相关量子分子动力学理论研究了中子晕核引起核反应机制中重要的同位旋效应以提取对称势. 因为同位旋相关量子分子动力学理论中的相互作用和介质中核子-核子碰撞截面都灵敏地依赖于碰撞系统的密度分布, 本项研究工作基于中子晕核扩展的密度分布. 该密度分布包含了反应机制中同位旋效应和疏散内部结构的平均特征. 为了弄清楚晕核引起核反应机制的同位旋效应, 在完全相同的入射道条件下, 比较了由中子晕核炮弹引起的同位旋效应和由相等质量的稳定核炮弹引起同位旋效应. 结果发现中子晕核炮弹引起的发射中子-质子比和同位旋分馏比明显大于相等质量稳定弹核产生的结果. 因而可以通过理论结果与实验数据的系统比较提取对称势.
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| 关 键 词： | 中子晕核 同位旋效应 对称势 同位旋分馏比 发射中子-质子比 |
| 收稿时间： | 2006-04-06 |
| 修稿时间： | 2006-04-06 |
Probing the Symmetrical Potential in Nuclear Reaction Iinduced by Neutron-Halo Nuclei |
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| LIU Jian-Ye,XIAO Guo-Qing,ZUO Wei,LI Xi-Guo. Probing the Symmetrical Potential in Nuclear Reaction Iinduced by Neutron-Halo Nuclei[J]. High Energy Physics and Nuclear Physics, 2007, 31(2): 150-154 |
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| Authors: | LIU Jian-Ye XIAO Guo-Qing ZUO Wei LI Xi-Guo |
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| Affiliation: | 1.Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China;2.Institute of Basic Physics, College of Mathematics-Physics and Information, Tianshui Normal University, Tianshui 741000, China;3.Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator of Lanzhou, Lanzhou 730000, China |
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| Abstract: | In terms of the isospin-dependent quantum molecular dynamics model (IQMD),important isospin effect in the halo-neutron nucleus induced reaction mechanism is investigated, and consequently,the symmetrical potential form is extracted in the intermediate energy heavy ion collision.Because the interactive potential and in-medium nucleon- nucleon (N-N) cross section in the IQMD model sensitively depend on the density distribution of the colliding system, this type of study is much more based on the extended density distribution with a looser inner nuclear structure of the halo-neutron nucleus.Such a density distribution includes averaged characteristics of the isospin effect of the reaction mechanism and the looser inner nuclear structure.In order to understand clearly the isospin effect of the halo-neutron nucleus induced reaction mechanism,the effects caused by the neutron-halo nucleus and by the stable nucleus with the same mass are compared under the same condition of the incident channel.It is found that in the concerned beam energy region,the ratio of the emitted neutrons and protons and the ratio of the isospin fractionations in the neutron-halo nucleus case are considerably larger than those in the stable nucleus case.Therefore,the information of the symmetry potential in the heavy ion collision can be extracted through such a procedure. |
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| Keywords: | neutron-halo nucleus isospin effect symmetrical potential isospin fractionation ratio ratio of emitted neutron and proton |
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