294MeV~（20）Ne＋~（159）Tb反应发射中等质量碎片的研究

• 作 者: 谢元祥，罗清政，卢俊
• 机 构: 中国科学院近代物理研究所
• 出 处: 高能物理与核物理
• 发表日期: 1994年11期
• 关键词: 衰变宽度 复合核 角分布 Ne Tb eV 出射道 电荷分布 非对称 统计模型

在２９４ＭｅＶ２０Ｎｅ轰击１５９Ｔｂ靶的反应中，用△Ｅ—Ｅ望远镜测量了１０°－１５０°发射的中等质量碎片（２＜Ｚ≤１１）的能谱．在后角区（＞９０°）这些能谱是钟罩型，峰位接近于出射道的库仑位垒．用运动源模型分析了这些能谱，结果说明这些碎片来自于共同的源—非完全熔合所形成的复合核．用统计模型ＧＥＭＩＮＩ程序拟合了碎片的电荷分布和角分布，计算值和实验值很好的符合证实了中等质量碎片来源于复合核非对称的两体衰变． In the reaction of 294 MeV20 Ne bombardment of the 159 Tb target, the energy spectrum of medium-mass fragments (2 90 °) these spectra are bell-shaped with a Coulomb barrier near the exit. The energy spectra were analyzed using a motion source model, and the results showed that these fragments originated from the composite nuclei formed by the common source-imperfect fusion. The statistical model GEMINI program was used to fit the charge distribution and angular distribution of the fragments. The good agreement between the calculated and experimental values ​​confirmed that the middle-quality fragments originate from the asymmetric two-body decay of the complex core.