25MeV/u^6He+~9Be破裂反应的α碎片发射  

α Fragment Emission in 25MeV/u^6He+~9Be Break-up Reaction

作　　者：李智焕[1] 叶沿林[1] 陈陶[1] 江栋兴[1] 华辉[1] 李湘庆[1] 王全进[1] 葛榆成[1] 庞丹阳[1] 狄振宇[1] 靳根明[2] 肖国青[2] 郭忠言[2] 肖志刚[2] 王宏伟[2] 张保国[2] 吴和宇[2] 李加兴[2] 孙志宇[2] 詹文龙[2] 

机构地区：[1]北京大学物理学院技术物理系,北京100871 [2]中国科学院近代物理研究所,兰州730000

出　　处：《高能物理与核物理》2003年第3期206-210,共5页High Energy Physics and Nuclear Physics

基　　金：国家重点基础研究发展规划 (G2 0 0 0 0 7740 0 )~~

摘　　要：测量了在 2 5MeV/u6 He轰击9Be靶的破裂反应产生的α碎片双微分截面及角分布 ,并在Serber模型的框架下计算了在破裂反应中衍射破裂与擦去过程的贡献 ,并对结果进行了讨论 .结果表明基于包含衍射破裂和擦去过程的Serber模型可以对6 He的直接反应进行较好地描述 ,擦去过程的贡献远大于衍射破裂的贡献 .相对于6 Li而言 ,6 He较大的去Energy and angular distributions of α fragments produced in 25Mev/u 6He+ 9Be break up reaction were measured. We calculated double differential cross section and angle distribution of? 4He fragment for 6He breakup reaction in terms of direct process theory including nuclear diffraction dissociation and stripping process based on Serber model. The influence of the diffraction dissociation and abrasion process to the break up reaction is investigated by the Serber model. The theoretical analysis indicates that the large breakup cross section of? 6He comes mainly from the low two neutron separation energy, but the difference of radius size between 6He and 6Li has small influence on the results.

关 键 词：中子晕核 破裂反应 衍射破裂 擦去过程 α碎片 微分截面 角分布 弱束缚特性 核反应 

分 类 号：O571.5[理学—粒子物理与原子核物理]