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arXiv 2106.04734physics.ins-det
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在Geant4中研究两种尺寸BC-404塑料制冷剂的本征时间分辨率和效率特性

Intrinsic time resolution and efficiency characterization for two size of BC-404 plastic scintillators studies in Geant4

Cristian Heber Zepeda Fernández, Lucio Fidel Rebolledo Herrera, Eduardo Moreno Barbosa, Edmundo Márquez Quintos

摘要:

时间分辨率是探测器的重要性能指标之一。对于闪烁体的情况,光的收集也是重要的,其取决于光传感器的有效面积(\textit{Scorer})。光电倍增管(PMT)通常具有比硅光电倍增管(SiPM)更大的有效面积,然而,由于其操作电压,尺寸或成本,在某些情况下可能难以使用它们。在这种情况下,优选使用SiPM。TR值还取决于闪烁体的尺寸和几何形状、光传感器的数量和电子部件。在这项工作中,我们研究的平均光子到达时间分布(AT)的记分员从一个SiPM 6 $\times$ 6~mm $^2$。我们将AT的变化定义为\textit{the intrinsic time resolution}(ITR)。在Geant 4中,我们模拟了两种不同的几何形状:正方形和六边形,BC-404塑料闪烁体耦合到一个记分器。模拟的源为1~GeV的Sr $^{90}$、Co $^{60}$、Cs $^{137}$、Na $^{22}$和$μ^-$。结果表明,AT和ITR取决于塑料闪烁体的几何形状和尺寸,记分器的位置,入射粒子及其能量。那么,ITR和TR对于检测器来说不是常数。最后,给出了AT与粒子入射沉积能量的关系,在实验中它们分别与探测器的响应时间事件和入射粒子的沉积电荷有关。

英文摘要:

The time resolution (TR) is one of the most important characteristic of a detector. For the case of a scintillator, the collection of light also is important, it depends of the effective area of the photo-sensor (\textit{Scorer}). The Photomultipliers Tubes (PMTs), normally, have an effective area greater than the Silicon Photomultipliers (SiPMs), however, due to its voltage of operation, their size or cost, in some cases it can be difficult to work with them. In which case, it is preferable to use SiPMs. The value of TR also depends of the size and geometry of the scintillator, number of photo-sensors and the electronic part.\\ In this work, we study the mean optical photon arrival time distribution (AT) to a Scorer from a SiPM of 6$\times$6~mm$^2$. We define the variation of AT as \textit{the intrinsic time resolution} (ITR). In Geant4, we simulated two different geometries: square and hexagonal, for a BC-404 plastic scintillator coupled to one Scorer. The sources simulated were Sr$^{90}$, Co$^{60}$, Cs$^{137}$, Na$^{22}$ and $μ^-$ of 1~GeV. It is shown that AT and ITR depends of the geometry and size of the plastic scintillator, the location of the Scorer, the incident particle and its energy. Then, the ITR and therefore the TR is not a constant for a detector. Finally, we show the relation between AT and the deposited energy by the particle incident, which are related in the experiment to the response time event of the detector and the deposited charge by the incident particle, respectively.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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