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。
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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 pionemitting source in highenergy heavy ion collisions with the radius of rootmeansquared of twopion relativedistance Rrmst. Based on the imaging technique, one can calculate Rrmst modelindependently. 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 longlived resonance decay, the values of Rrmst show a larger spatial size of pionemitting region. Meanwhile, for the chaotic source the chaoticity factors calculated by imaging technique are larger than that of Gaussian fitted. -
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