Entropy produced in heavy ion collisions  

作　　者：XiHong－Fei ShenWen－Qing 等 

机构地区：[1]InstituteofModernPhysics,mtheChineseAcademyofSciences,Lanzhou730000 [2]ShanghaiInstituteofNuclearResearc

出　　处：《Nuclear Science and Techniques》1997年第3期136-138,共3页核技术（英文）

摘　　要：ＥｎｔｒｏｐｙｐｒｏｄｕｃｅｄｉｎｈｅａｖｙｉｏｎｃｏｌｉｓｉｏｎｓＴｈｅＰｒｏｊｅｃｔＳｕｐｐｏｒｔｅｄｂｙＮａｔｉｏｎａｌＮａｔｕｒａｌＳｃｉｅｎｃｅＦｏｕｎｄａｔｉｏｎｏｆＣｈｉｎａＭａｎｕｓｃｒｉｐｔｒｅｃｅｉｖｅｄｄａｔｅ：１９９７０...A new observable, yield ratio of d/(d+t+ 3He+ 4He) produced in heavy ion reactions is suggested as a measure of entropy. It is found that in quantum statistical model (QSM), which is quite commonly used for extracting the entropy, the relation between this ratio and entropy is almost linear and independent of break up density and N/Z ratio of the system. The experimental data of 12 C+ 197 Au from 30 MeV/u to 84 MeV/u and of 197 Au+ 197 Au from 100 MeV/u to 250 MeV/u are compared with QSM calculation results. The values of entropy are obtained for C+Au and Au+Au system without assumption on break up density.

关 键 词：重离子碰撞 熵产生 量子统计模型 

分 类 号：O571.6[理学—粒子物理与原子核物理]