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重离子弹性散射中的角分散研究
  • 期刊名称:《原子核物理评论》25(2008)1
  • 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]中国科学院近代物理研究所,甘肃兰州730000, [2]Centro de Ciencias Fisicas, National University of Mexica (UNAM), Cuemavaca, Mexico, [3]Center for Nonlinear Physics, RSPhysSE, Australian University, Canberra, ACT 0200, Australia
  • 相关基金:国家自然科学基金资助项目(10675149,10535010); 中国科学院方向性项目资助(KJCX3-SYW-No1,KJCX2-SW-No18); 国家重点基础研究发展规划资助项目(2007CB815000).致谢 感谢对RIBLL实验及其数据分析作出贡献的诸位同仁,如中国科学院近代物理研究所的肖国青、徐瑚珊、肖志刚、孙志宇、胡正国、张雪荧、王宏伟、毛瑞士、袁小华、徐治国、赵铁成、张宏斌、徐华根、祁辉荣、王弱、贾飞、武丽杰、丁先利、高启、高辉、靳根明、李松林、李君清、张亚鹏,南京大学的任中洲,理论物理所的周善贵,北京大学的张双全和庞丹阳以及上海核子所的徐望和范功涛.
  • 相关项目:晕核弹性散射产物的角分散研究
中文摘要:

简要评述了重离子弹性散射角分散研究的内容、方法及物理意义。通过前角区重离子弹性散射产物微分截面的角分布测量,作出角分散图ln(dσ/dθ)-θ^2。分析经典偏转函数,从而在实验上确定了反应系统的核虹角。在低能、重靶的重离子反应系统中,核虹角远小于擦边角。晕核及弱束缚核比稳定核具有更小的核虹角和更大的核相互作用范围。经典偏转函数的计算有助于提供一套光学势参数,以便于拟合弹性散射产物的微分截面。

英文摘要:

In terms of the angular dispersion plot of ln(dσ/dθ) versus θ^2, which can be obtained from the angular distribution of the elastic scattering differential cross sections in heavy ion collisions, systematic analysis on the angular dispersions is made by using classical deflection function for the available experimental data on the target of 208Pb. Our systematic analyses bring about some important results. Firstly, there is an angular dispersion turning angle at forward angular range beyond the grazing angle. Secondly, the nuclear rainbow angle for such reaction systems can be determined by measuring differential cross sections of elastic scattering at forward angular range and analyzing the angular dispersion. Thirdly, analysis of angular dispersion may provide a way to determine a set of optical potential parameters by means of fitting the experimental data of elastic scattering differential cross sections. Finally, for the halo nuclei as the projectiles, there is an exotic behaviour, i. e., smaller angular dispersion turning angle.

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