在“星光Ⅲ”实验装置上开展皮秒激光脉冲中子源实验,使用液体闪烁体探测器测得较好的中子信号,利用飞行时间法获得中子的能量/时间分布,通过示波器电压时间积分与阻抗之比得到不同能量段的电荷值。建立液体闪烁体探测器Geant4计算模型,通过实际打靶情况与标定情况下液体闪烁体探测器出光口收集到的可见光光子数之比,结合标定的灵敏度数据,获得液体闪烁体探测器对不同能量中子的灵敏度。计算得到源发射的中子能谱,能量在1 MeV以上的液体闪烁体探测器方向测得的中子产额为1.04×108 sr-1。 Experiments on the “Star Ⅲ” picosecond laser pulsed neutron source experiment, the use of liquid scintillator detector better neutron signal, the use of time-of-flight neutron energy / time distribution, through the oscilloscope The ratio of the voltage time integral to the impedance gives the charge values ​​for different energy segments. The calculation model of liquid scintillation detector Geant4 is established. By comparing the ratio of visible photons collected by the liquid scintillator detector in the actual shooting situation with the calibrated sensitivity data, Sub-sensitivity. The neutron energy spectrum of the source emission was calculated. The neutron yield measured by the liquid scintillator detector with energy above 1 MeV was 1.04 × 108 sr-1.