18．8－46．2MeV／u^（12）C与^（93）Nb相互作用中靶余核的激发  

EXCITATION FUNCTIONS OF THE TARGET RESIDUAL NUCLEIFROM THE INTERACTION OF 18.8-46.2MeV/u￣^(12)C WITH￣^(93)Nb

作　　者：李新华[1] 李泽[1] 敬克兴[1] 刘永辉[1] 郑玉明[1] 萨本豪[1] 李文新[2] 孙彤玉[2] 孙儒林 吴定清[2] 赵莉莉[2] 尹新民[2] 

机构地区：[1]中国原子能科学研究院 [2]中国科学院近代物理研究所

出　　处：《核化学与放射化学》1994年第3期186-192,共7页Journal of Nuclear and Radiochemistry

基　　金：国家自然科学基金资助项目

摘　　要：利用离线γ能谱法，测定了１８．８－４６．２ＭｅＶ／ｕ的￣（１２）Ｃ离子与￣（９３）Ｎｂ相互作用中４３个靶余核的激发函数。这些激发函数随着入射能的变化大体上分为二类，定性显示了熔合－碎裂模型对于热核的类蒸发，类裂变和多破碎三种衰变模式的竞争演化预言的变化趋势。还发现了￣（９２）Ｎｂ￣ｍ的生成截面几乎恒定于５．０×１０￣（３０）ｍ￣２的反常现象。The production cross-sections of 43 radioactive target residues are measured with off-linegamma spectrometry for the interaction of￣(12)C with￣(93)Nb at the bombarding energies from 18.8 to46.2MeV/u,These cross- sections seem to be grouped into three categories ,responding to thecompetition among three decay modes,i.e.the pseudoevaporation mode,the pseudofission modeand the multifragmentation mode,of hot nuclei in the energy region of interest. However,the prc-duction cross-section of￣(92)Nb￣m unusually keeps constant around 5.0×10￣(-30)m￣2.

关 键 词：激发函数 热核衰变 靶余核 碳12 

分 类 号：O615.5[理学—无机化学]