摘要
利用蒙特卡罗模拟方法,研究了光子转换过程的重建,并得到了依赖于光子能量的光子探测效率及其能量分辨的函数分布.电子的能量损失校正与光子的能量标度均用北京谱仪的真实数据做了刻度.研究表明,改进的晶体球(CB)函数能较好地描述由电子对重建出的光子能量分布。在北京谱仪实验上,对于100-260MeV能量的光子,由电子对转换方法测量的光子能量分辨可达到2.3-3.8MeV.
Using Monte Carlo simulation, reconstruction of photon conversions is studied, and the detection efficiency and energy resolution as a function of photon energy are obtained. The dE/dx correction for the electrons from photon conversions and the energy scale for the photons are calibrated with BES Ⅱ data.An improved Crystal Ball function describes well the energy distribution of the photons. Photon energy resolutions in the range from 2.3 to 3.8MeV are found for the photons with energy from 100 to 260MeV at the BES Ⅱ detector.
出处
《高能物理与核物理》
CSCD
北大核心
2006年第5期378-386,共9页
High Energy Physics and Nuclear Physics
基金
国家自然科学基金(19991480)中国科学院知识创新工程项目(U-503(高能所))资助~~