论文标题

恒定分数的阈值脉冲形状辨别法的优化和首次电子实施

Optimization and first electronic implementation of the Constant-Fraction Time-Over-Threshold pulse shape discrimination method

论文作者

Roy, A., Vartsky, D., Mor, I., Boiano, C., Brambilla, S., Riboldi, S., Cohen, E. O., Yehuda-Zada, Y., Beck, A., Arazi, L.

论文摘要

在这项贡献中,我们报告了最近评估的中子/伽马射线脉冲脉冲辨别率(PSD)的近期评估的恒定分数阈值(CF-TOT)方法的进一步研究。先前证明了CF-TOT PSD方法比恒定阈值(CT-TOT)方法的优越性,降至100 kevee的低中子能阈值。在这里,我们报告了传统使用的电荷比较(CC)方法与CF-TOT方法之间使用Stilbene闪烁体耦合到硅光电倍增剂的定量比较,从而实现了记录的快速中性和伽马射线波形的离线分析。恒定分数值的优化表明20%分数产生了最佳的(FOM)和伽马射线峰值对谷(P/V)比率。 100 kevee的粒子能阈值获得的结果表明,使用CF-TOT方法获得的FOM和P/V值优于使用标准CC方法获得的FOM和P/V值。此外,使用适用于多通道体系结构的简单电路进行了CF-TOT方法的第一个电子实现。提出了使用此电路原型获得的初始结果。

In this contribution we report on further investigations of the recently-evaluated Constant-Fraction Time-over-Threshold (CF-ToT) method for neutron/gamma-ray pulse shape discrimination (PSD). The superiority of the CF-ToT PSD method over the constant-threshold (CT-ToT) method was previously demonstrated, down to low neutron energy thresholds of 100 keVee. Here, we report on a quantitative comparison between the traditionally used Charge Comparison (CC) method and the CF-ToT method using a stilbene scintillator coupled to a silicon photomultiplier, implementing an offline analysis of recorded fast-neutron and gamma-ray waveforms. An optimization of the constant fraction value indicates that a 20%-fraction yields the optimum figure-of-merit (FOM) and gamma-ray peak-to-valley (P/V) ratio. The results obtained for a particle energy threshold of 100 keVee show that the FOM and P/V values achieved with the CF-ToT method are superior to those obtained using the standard CC method. In addition, a first electronic implementation of the CF-ToT method was performed using simple circuitry suitable for multichannel architecture. Initial results obtained with this circuit prototype are presented.

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