600MeV　^(18)O+^(nat)Pb(厚靶)系统生成Hg同位素独立产额测量(Ⅱ)结果与分析  

Independent Yield Measurement for the Hg-Isotope Products From 600MeV^(18)O + ^(nat)Pb (Thick Target) System (Ⅱ) Experiment Results and Analysis

作　　者：张立[1] 郑继文[1] 赵进华[1] 秦芝[1] 杨永峰[1] 胡青元[1] 张纯[1] 王积成[1] 郭天瑞[1] 靳根明[1] 

机构地区：[1]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》1998年第12期1068-1073,共6页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金!19575056;中国科学院重大项目资助

摘　　要：报道了600MeV（18）O轰击（nat）Ph（厚靶）生成的质量数在180—209之间的Hg同位素产物独立截面的测量结果．通过与600MeV质子轰击天然铅靶生成Hg同位素产额分布的比较，讨论了几个质量区段Hg同位素的生成机制．测量结果也与相对论重离子碎裂反应双质子移出道的产额分布进行了比较．结果表明，中能重离子与中子较富集靶核组成的反应系统对生成丰中子类靶余核具有较明显的优势．The average independent production cross sections of the radioactive Hg isotopes in the mass range of 180 to 209, produced in 600MeV-(18)O bombardment on (nat)Pb (thick target), were measured. The production mechanisms for the Hg-isotope products at different mass section were discussed by means of a comparison with the Hg-isotope distribution obtained in 600 MeV proton bombardment on (nat)Pb. The measlesment results were also compared with the Ir-isotope distribution observed from relativistic (197)Au projectile fragmentation reaction. The present experiment results showed that using intermediary-energy heavy ion beams bombarding neutron-rich heavy targets is a favourable reaction to produce neutron-rich heavy residues.

关 键 词：同位素分布 独立截面 重离子反应 汞同位素 产额 

分 类 号：O614.243[理学—无机化学] O571.426[理学—化学]