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.