Effects of deep-level defects on carrier mobility in CdZnTe crystals
Effects of deep-level defects on carrier mobility in CdZnTe crystals
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DOI：
10.1016/j.nima.2014.08.040
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发表时间：
2014-12
影响因子：
1.4
通讯作者：
Lingyan Xu;W. Jie;Xu Fu;G. Zha;Tao Feng;Rongrong Guo;Tao Wang;Yadong Xu;Y. Zaman
中科院分区：
文献类型：
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作者：
Lingyan Xu;W. Jie;Xu Fu;G. Zha;Tao Feng;Rongrong Guo;Tao Wang;Yadong Xu;Y. Zaman
通过脉冲形状区分中子和伽马射线(n/γ)的能力对于液体闪烁体(LS)中子探测器的许多用户来说是重要的。为了模拟中子探测器的THEN/γ分辨能力，我们开发了一种方法来模拟入射γ在LS中产生的脉冲信号。基于原型LS探测器的几何结构和材料，利用Geant4模拟软件对入射γ辐射电离和激发产生的光脉冲进行了模拟。通过单次光电子实验获得了光电倍增管(PMT)和数据采集(DAQ)电路对入射光的响应。探测器的最终输出信号是通过将其光脉冲与光电倍增管和数据采集器的响应函数卷积而产生的。采用电荷比较法(CCM)和脉冲梯度法(PGM)对模拟信号进行识别。通过将仿真结果与原型LS探测器的实验结果进行比较，验证了仿真结果的正确性。我们的方法可以应用于LS探测器的设计，随后对其进行了N/γ区分的优化。该方法也有助于分析实验数据和评价n/γ分辨技术的性能。
The capability to discriminate between neutrons and gamma rays (n/γ) by means of their pulse shapes is important for many users of liquid scintillator (LS) neutron detectors. To simulate then/γ discrimination capability of a neutron detector, we have developed a method to simulate the pulse signal generated by an incidentnor γ in the LS. Light pulses caused by ionization and excitation from incidentnor γ radiation are simulated by the Geant4 simulation package based on the geometry and materials of a prototype LS detector. The response to the incident light of the photomultiplier tube (PMT) and data acquisition (DAQ) circuit was obtained from a single photoelectron experiment. The final output signal from a detector was produced by convolving its light pulse with the response function of the PMT and DAQ. Two methods, the charge comparison method (CCM) and the pulse gradient method (PGM), were applied to discriminate the simulated signals. The simulation was validated by comparing its result to an experimental result from the prototype LS detector. Our method can be applied in the design of an LS detector, which has subsequently been optimizedn/γ discrimination. The method can also be helpful to analyze experimental data and evaluate the performance ofn/γ discrimination techniques.