25MeV/u^(40)Ar+^(93)Nb反应中热核的激发能和核温度  

Excitation Energy and Temperature of Hot Nucleiin the Reaction of 25 MeV/u 40Ar+93Nb

作　　者：段利敏[1] 王素芳[1] 张保国[1] 文万信[1] 靳根明[1] 郑纪文[1] 贺智勇 李祖玉[1] 谭继廉[1] 肖志刚[1] 王宏伟[1] 吴和宇[1] 

机构地区：[1]中国科学院近代物理研究所

出　　处：《高能物理与核物理》1998年第9期780-786,共7页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金

摘　　要：利用半导体望远镜探测器和ＰＰＡＣ对２５ＭｅＶ／ｕ４０Ａｒ＋９３Ｎｂ反应中的带电粒子和余核进行了关联测量，对所得α粒子能谱用三源模型进行了拟合，并由余核飞行时间和粒子多重性得到热核激发能．通过对温度的修正，发现在本实验中有激发能Ｅ＊／Ａ为４．３ＭｅＶ，温度Ｔｉｎｉｔ为６．９ＭｅＶ的热核形成。通过与其它实验结果的对比可以看出核物质在轻系统和重系统中行为的差异。The charged particles and residues were correlatively measured by telescopes and PPACs in the reaction of 40Ar+93Nb at incident energy of 25 MeV / u. Energy spectra of αparticles were fitted by three moving sources and the excitation energy of hot nuclei were determined by the TOF of residues and particle multiplicity. Abstracted temperature was correlated thoroughly and the results show that hot nuclei with excitation energy E/A≈ 4.3MeV and temperature Tinit≈ 6.9MeV were formed in the reaction The behavior of nuclear matter in various systems was compared and the difference can be seen in the light and heavy reaction system.

关 键 词：热核 核温度 激发能 重离子反应 铌93 氩40 

分 类 号：O571.426[理学—粒子物理与原子核物理]