摘要
相对论重离子中心碰撞 1.8AGeVAr +Pb的实验结果表明 ,在π源密度的高斯分布下 ,2π及 3π干涉学分析对π源寿命参数是不敏感的 .为此 ,引入敏感性参数As,用小相对动量区域π干涉学分析方法给出了这一实验结果的理论解释 ,并把这一理论结果推广到一类对称分布π源情况下nπ干涉学分析对π源寿命参数的敏感性 .研究结果表明 ,π干涉学分析对π源寿命参数不敏感的条件为As 1,说明研究中所引入的敏感性参数和所采用的小相对动量区域π干涉学分析方法是正确的 .在小相对动量区域 ,可以用变量Q作nπ干涉学分析 .
The experimental results which indicate that two-pion and three-pion interferometry analyses are insensitive to the life parameter of the pion source if the density distribution of pion source is Gaussian in the central relativistic heavy ion collisions 1.8 A·GeV Ar+Pb,are theoretically explained using the pion interferometry at small relative momentum, and generalized to the insensitivity of n-pion interferometry analysis to the life parameters of the symmetric pion source of one kind.The study made with insensitivity parameter A s introduced shows that the criterion for the insensitivity of pion interferometry analysis to the life parameter of pion source is A s 1. The insensitivity parameter introduced and the method of pion interferometry analysis at small relative momentum are correct.In addition, our study indicates that variable Qcan be used to do n-pion interferometry analysis at small relative momentum.
出处
《哈尔滨工业大学学报》
EI
CAS
CSCD
北大核心
2002年第2期258-260,共3页
Journal of Harbin Institute of Technology
关键词
相对论重离子碰撞
Π干涉学
π源寿命
敏感性
relativistic heavy ion collisions
pion interferometry
life parameters of pion sources
