BaF2探测器测量α粒子的时间分辨随温度变化实验研究

本工作对用于测量α粒子的BaF₂探测器的时间分辨随温度变化情况进行了实验研究。实验选用退激γ射线能量较高的²³⁷Npα源，利用α粒子与退激γ射线的时间关联性得到时间谱，在不改变任何条件的情况下对BaF₂晶体加热，加热到设定温度后保持恒温，在BaF₂晶体达到热平衡后开始测量时间谱，由该时间谱上读出的半高宽与标准偏差的线性关系得出α粒子的时间分辨随温度变化的情况。测量结果显示，时间分辨随温度变化在目前实验条件下较为明显，这为未来快时间分辨α粒子探测器的选择和优化使用提供了依据。

Time Resolution Research of BaF2 Detector Used for α Particle Detection at Different Temperatures

The time resolution of BaF₂ detector used for α particle detection was measured. The ²³⁷Np α source, which has high energy γ-ray emitting from α decay, was chosen for the coincidence measurement. The time spectra were measured by the time-coincidence between the α particle and the γ-ray. The BaF₂ scintillator was heated to the given temperatures and the corresponding time spectra were measured. The time resolution of the detector under different temperatures was given by the linear relationship between the FWHM and the standard deviation which were obtained from the measured time spectra. The result shows that the time-resolution is dependent on the crystal temperature, and it provides us useful information for selection and optimization of fast time resolution α particle detector in the future.