Production and Characterization of Hot Nuclei in Ar Induced Reactions at 25 MeV/u

• 作者: He, Zhiyong Jiang, Dongxing Jin, Weiyang Jing, Genming Li, Zhuyu Qian, Xing Song, Mintao Tan, Jilian Wang, Shufang Wu, Enjiu Wu, Heyu Yin, Shuzhi Zhang, Chun Zheng, Jiwen
• 来源期刊: 原子核物理：英文版
• 学科: 物理学
• 关键词: —Hot NUCLEI Intermediate ENERGY heavy ion COLLISION Linear MOMENTUM transfer Excita-tion ENERGY Nuclear temperature
• 年，卷（期）: 1996,（3）
• 页码范围: 145-152
• 页数: 8页
• 分类号: O4

摘要

【正】 Hot nuclei produced in the reactions of 25 MeV/u⁴⁰Ar with ²⁰⁹Bi and^Na1Ag are studied.Theinitial properties of these nuclei :excitation energies,linear momentum transfer and temperatures are char-acterized through the measurements of folding angle of fission fragments,light charged particle energyspectra and intermediate mass fragments.Nuclei with excitation energies as high as～600 MeV and tem-peratures as high as～6 MeV are produced.The spectra of alpha particles detected in coincidence with fis-sion fragments in the case of different average linear momentum transfer are analyzed and the initial tem-peratures of the hot nuclei are determined.A saturation（or limiting）temperature near 6 MeV is foundfor alpha emission from medium mass nuclei having excitation energies higher than 3 MeV/u.This resultprovides evidence for a soft nuclear equation of state at thee high excitation energies and is consistentwith predictions of statistic multifragmentation model calculations.