~(12)C与~(209)Bi反应中Au同位素的产额与Q_(gg)的关系

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。

Qgg-Yield Dependence of Au Isotopes in Interaction of 47 MeV/u 12C With 209Bi

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 Q_gg values. The fact demonstrates that neutron-deficient Au isotopes seem to arise from the second process in the reaction.