^(12)C与^(209)Bi反应中Au同位素的产额与Q_(gg)的关系  

Q_(gg)-Yield Dependence of Au Isotopes in Interaction of 47 MeV/u ^(12)C With ^(209)Bi

作　　者：杨维凡[1] 丁华杰[1] 袁双贵[1] 卢希庭[2] 

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

出　　处：《原子能科学技术》2010年第5期513-516,共4页Atomic Energy Science and Technology

基　　金：国家自然科学基金资助项目(10905074)

摘　　要：用47MeV/u12C离子轰击天然铋靶,通过炮弹和靶核之间的核子转移反应产生Au同位素。使用放射化学方法从大量Bi和复杂反应产物中分离、纯化Au,并制备Au的γ射线测量源。使用HPGe探测器测量放射性Au同位素的γ活性。根据照射结束时Au同位素的活度和其他相关数据,确定每个Au同位素的产生截面。分析发现,缺中子Au同位素的产生截面与Qgg值之间不遵从指数依赖关系,这可用重离子碰撞中的次级过程加以解释。209Bi was irradiated with 47 MeV/u 12C ions,an the Au isotopes were produced via multinucleon transfer reaction in bombardments of 209Bi with 12C.Au was separated radiochemically from the mixture of Bi and the reaction products.The γ-radioactivities of Au isotopes were measured using a HPGe detector.The production cross sections of Au isotopes were determined based on the activities of Au isotopes at the end of irradiation and the other relational data.It is found that the production cross sections for neutron-deficient Au isotopes deviate from an exponential dependence on Qgg values.The fact demonstrates that neutron-deficient Au isotopes seem to arise from the second process in the reaction.

关 键 词：12C Au同位素 Qgg值 丰中子和缺中子同位素 

分 类 号：O615.11[理学—无机化学]