Direct calibration of neutron detectors for laser-driven nuclear reaction experiments with a gated neutron source.
Direct calibration of neutron detectors for laser-driven nuclear reaction experiments with a gated neutron source.
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DOI：
10.1063/5.0127101
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发表时间：
2023-01
期刊：
影响因子：
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通讯作者：
Xiaofeng Xi;Guoqiang Zhang;Fulong Liu;Guangyong Fu;C. He;Hongtao Chen;C. Lv;Wei Sun;Kai Zhang;Putong Wang;X. Deng;Zhi-guo Ma;C. Fu;B. Guo
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文献类型：
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作者：
Xiaofeng Xi;Guoqiang Zhang;Fulong Liu;Guangyong Fu;C. He;Hongtao Chen;C. Lv;Wei Sun;Kai Zhang;Putong Wang;X. Deng;Zhi-guo Ma;C. Fu;B. Guo
如今，高强度激光器的持续技术进步正在开辟超强激光脉冲触发或实质性影响核反应的可能性。然而，由于强激光产生的电磁脉冲的干扰，对反应产物的定量测量是一个很大的挑战。快闪烁探测器被广泛地用于快中子探测。中子探测器的刻度是测量中子产额的关键。由于在短时间内出现由多个中子信号叠加的一个大信号，因此难以直接和精确地校准探测器对单个中子的响应。在本工作中，我们开发了一种直接校准方法与门控裂变中子源252 Cf来解决这个问题。这项工作表明，门控裂变中子源的方法，与一个独特的“脉冲形状歧视和飞行时间窗口”的功能，具有最高的本底-γ-拒绝和提高最终结果的置信水平的液体和塑料闪烁体。与康普顿边缘法和中子束法相比，门控裂变中子源法得到的中子信号更清晰，避免了中子探测器模型精度的影响。该方法可广泛应用于激光驱动的核物理实验中，对中子探测具有较高的精度。
Nowadays, the sustained technological progress in high-intensity lasers is opening up the possibility of super-intense laser pulses to trigger or substantially influence nuclear reactions. However, it is a big challenge to quantitatively measure the reaction products because of the interference of electromagnetic pulses induced by high-intensity lasers. Fast scintillation detectors are widely chosen for fast neutron detection. The calibration of neutron detectors is crucial to measuring the yield of neutron products. Since one large signal superimposed by a number of neutron signals appears during a short period, it is difficult to directly and precisely calibrate the detectors' response for a single neutron. In the present work, we developed a direct calibration method with a gated fission neutron source 252Cf to solve this problem. This work demonstrates that the gated fission neutron source approach, with a unique "Pulse Shape Discrimination & Time of Flight window" function, has the highest background-γ-rejection and improves the confidence level of the final results for both liquid and plastic scintillator. Compared with the result of Compton edge method and neutron beam method, the gated fission neutron source method achieves much cleaner neutron signals and avoids interference caused by the modeling accuracy of the neutron detectors. This approach can be widely used in laser-driven nuclear physics experiments with higher accuracy for neutron detection.