35MeV/u^(40)Ar+^(112)Sn/^(124)Sn反应中热核的同位旋对热核发射机制的影响  

Isospin Effect on the Emission Mechanism of Hot Nuclei in 35MeV/u^(40)Ar + ^(112)Sn / ^(124)Sn Reactions

作　　者：吴和宇[1] 肖志刚[1] 李祖玉[1] 王宏伟[1] 段利敏 张保国 柳永英 王素芳 靳根明[1] 肖国青[1] 郭钟言 诸永泰[1] 

机构地区：[1]中国科学院近代物理所,兰州73000

出　　处：《高能物理与核物理》1999年第11期1115-1118,共4页High Energy Physics and Nuclear Physics

基　　金：中国学院百人计划;中国科学院"九.五"重点项目;国家自然科学基金

摘　　要：作为放射性束物理的延伸，热核的同位旋效应引起了理论和实验研究的广泛重视．给出３５ＭｅＶ／ｕ(４０)Ａｒ＋(１１２)Ｓｎ／(１２４)Ｓｎ实验中，热核的同位旋对热核衰变出射道机制的影响：由于库仑不稳定性和库仑力作用，丰质子热核达到系统平衡前，很容易出现大量有利于增加余核中质比的高能粒子出射（如ｐ．３Ｈｅ、ａ等）；该类轻粒子在热核的衰变链中发射几率较大而且衰变链很长．这样，传统的热核测量量（如能谱斜率温度）将受到测量粒子种类的较大影响．As an extension of radioactive ion beam physics, the research onisospin dependent properties of hot nuclei has increasingly attractedconsiderable interest. The isospin effect on the decay of hot nuclei inreactions 35MeV / u 40Ar+ 112Sn / 124Sn has been investigared. It is concludedthat due to Coulomb repulsion and instability, proton-rich hot nuclei probablyemit prides such as a with high energy to increase their neutron-protonratio. Moreover, the decay chain for those particles is seemingly long andthe emission Probability is high. Thus, the conventional observations, forinstance, the 'slope temperature" extracted from energy spectrum, may veryappreciably with the measured particles.

关 键 词：热核 同位旋效应 核温度 发射机制 氩40 锡112 

分 类 号：O571.2[理学—粒子物理与原子核物理]