利用imaging方法提取高能重离子碰撞中Core-Halo模型发射源的信息
Extracting Information of Core-Halo Model in Heavy-ion Collisions by Imaging Technique
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																摘要: 根据对高斯源的检验,引入两个π介子相对距离的均方根半径Rrmst来表示高能重离子碰撞中π介子发射源的空间尺寸.利用imaging计算方法可以不依赖于源模型计算出相对距离的均方根半径.对Core-Halo模型进行计算并与高斯拟合结果比较,结果显示,由于长寿命共振态衰变产生的π介子的贡献,半径Rrmst显示出较大的π介子发射空间.另外,对于π介子为混沌发射的情况,通过imaging方法计算得到的π介子发射源的混沌性参量明显大于高斯拟合所得到的结果.- 
											关键词: 
																							
- 相对距离均方根半径 /
- 2π关联函数 /
- Core-Halo模型 /
- imaging计算方法 /
- 高斯拟合
 Abstract: We characterize the spatial dimension of pion-emitting source in high-energy heavy ion collisions with the radius of root-mean-squared of two-pion relative-distance Rrmst,. Based on the imaging technique, one can calculate Rrmst model-independently. Applying this method to the Core-Halo model and comparing the results with that of Gaussian fitted, the results indicate that due to the effects of long-lived resonance decay, the values of Rrmst show a larger spatial size of pion-emitting region. Meanwhile, for the chaotic source the chaoticity factors calculated by imaging technique are larger than that of Gaussian fitted.
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