25MeV／u^（40）Ar＋^（159）Tb反应中等质量碎片的热核蒸发  

Evaporation of Intermediate-Mass Fragments From Hot-Nuclei in Reaction￣(40)Ar+￣(159)Tb at 25MeV/u

作　　者：钱兴[1] 江栋兴[1] 钱涛[1] 华辉[1] 林俊松[1] 邬恩九 郑纪文 靳根明[1] 尹淑芝 谭继廉 金卫阳 宋明涛 李祖玉[1] 贺智勇 王素芳[1] 

机构地区：[1]北京大学技术物理系,中国科学院近代物理研究所

出　　处：《高能物理与核物理》1996年第4期304-310,共7页High Energy Physics and Nuclear Physics

基　　金：国家科委基础研究;国家自然科学基金

摘　　要：在２０°至１５５°范围内测量了２５ＭｅＶ／ｕ的４０Ａｒ轰击１５９Ｔｂ靶产生的单举中等质量碎片（３≤Ｚ≤９）能谱．后角区中等质量碎片能谱具有明显的统计蒸发特性，不同元素的能谱可用相同参数的单个运动源模型很好地拟合．拟合提取的源速度和核温度等源参数与非完全熔合所形成热核的反冲速度和核温度近似一致，表明这些不同的中等质量碎片共同起源于热核的统计蒸发．使用统计程序ＧＥＭＩＮＩ计算了碎片角分布和电荷分布．The inclusive energy spectra of intermediate-mass fragments(IMF)(3≤Z≤9)have been measured in the range from 20°to 155°for 40Ar+159Tb reaction at 25MeV/u.At backward angles,the spectra of IMF show a characteristic of statistic evaporation and can be well fitted by a moving source with same parameters.The obtained source velocity and temperature are in agreement with the corresponding values of hot nuclei produced in an incomplete-fusion process.Therefore,it seems that there IMF are statistically evaporated from a same source.The experimental results have for compared with the predictions of the statistical model using GEMINI code.

关 键 词：中等质量碎片 统计蒸发 氩40 铽159 

分 类 号：O572.22[理学—粒子物理与原子核物理]