束流实验中不同尺寸塑料闪烁体的时间特性(英文)

Timing Performance of Plastic Scintillators of Various Sizes in a Beam Test

北京谱仪(BESⅢ)中的飞行时间探测器将采用长2．3m宽6cm的长条形塑料闪烁体．利用北京高能物理研究所的实验束流对铝膜包装的不同厚度闪烁体的本征时间分辨进行了研究,给出了4cm,5cm和6cm闪烁体的时间分辨,而且用蒙特卡罗模拟做了比较,结果表明5cm厚的闪烁体具有最佳性能．

The time-of-flight detector of the Beijing Spectrometer Ⅲ（BESⅢ） is built with long and narrow plastic scintillator bars, with each being 2.3m long and 6cm wide. The time resolution of prototypes wrapped with aluminum film has been studied for various thickness of the scintillator using a test beam at the Institute of High Energy Physics in Beijing, China. In this paper, the position-dependent time resolution of the scintillator with a thickness of 4cm, 5cm and 6cm is presented and compared with a Monte Carlo simulation, the results show that the bar with a thickness of 5cm has the best performance.