135MeV／u^（12）C和铁相互作用中靶余核的质量分布  

Mass Yield Distribution of Target Residues from the Interaction of Iron with 135MeV/u ^(12)C Ions

作　　者：秦芝[1] 李文新[1] 赵莉莉[1] 文万信[1] 罗清政 孙彤玉[1] 安部静子 大久保嘉高 岩本正子 小林羲男 安部文敏 

机构地区：[1]中国科学院近代物理研究所 [2]日本理化学研究所

出　　处：《高能物理与核物理》1995年第6期481-488,共8页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金资助

摘　　要：用核化学技术测定了１３５ＭｅＶ／ｕ１２Ｃ和铁相互作用中的靶余核的生成截面，通过高斯电荷分布函数得到了靶余核的质量分布．与４６ＭｅＶ／ｕ１２Ｃ＋Ｃｕ相比，发现Ａ＜３０质量区的产额明显增加，且产物有偏向丰中子一侧的趋势．实验测定的质量分布与熔合碎裂模型和级联两体模型的计算结果进行了比较，结果似乎表明在很高入射能情况下多重碎裂衰变是Ａ＜３０靶余核生成的主要反应机制．The formation cross sections of target residues have been measured from the interaction of iron with 135MeV/u12C ions.With the help of assumption of Gaussian charge distribution,the mass yield distribution was obtained.We found that the yield in mass region of A<30 were notably increased and the products got away to neutron-excessive.The experimental results were compared with calculations based on the statistical fusion fragmentation model and on the sequential binary decay model,respectively. It seems to indicate that the multifragmentation decay mode was the dominant reaction mechanism responsible for production of the fragments with mass number A<30 in the produce process of target residues under the condition of the higher incident projectile energy.

关 键 词：^(12)C+Fe相互作用 质量分布 熔合碎裂统计模型 级联两体统计模型 

分 类 号：O571.42[理学—粒子物理与原子核物理]