The Kyungpook National University Advanced Positronium Annihilation Experiment (KAPAE) aims to study ortho-positronium annihilation including invisible and visible exotic decay processes. The detector for this experiment consists of two main parts: the trigger part and the $\gamma$-ray detection part. In this study, we focused on the development of the trigger and $\gamma$-ray detection setup for the KAPAE detector. In the trigger setup, the suitable thickness of the plastic scintillator for positrons trigger is determined. The aerogel and nitrogen gas environment in which ortho-positronium can reduce the pick-off effect for 3-$\gamma$ annihilation is created. The $\gamma$-ray detection part consists of 196 bismuth germanate (BGO) crystals covered with reflectors. The light yield and energy resolution uniformity of BGO crystals and the best suitable reflector for better light collection are evaluated. The source position dependency test for the BGO crystals are also examined. Single layer of polyethylene naphthalate (PEN) film plastic scintillator and aerogel with the continuous flow of nitrogen gas are found well suited for positrons trigger and annihilation environment, respectively. The light yield and its uniformity of 196 BGO crystals confirm its application for $\gamma$-ray detection in the KAPAE detector. Moreover, the VM2000 are found the best suitable reflector due to the small thickness and good reflectivity as compared to Teflon reflector.

庆北国立大学正电子An灭实验（KAPAE）旨在研究正电子-灭，包括不可见和可见的外来衰变过程。此实验的检测器由两个主要部分组成：触发部分和$\gamma$射线检测部分。在这项研究中，我们重点研究了触发和$\gamma$KAPAE检测器的X射线检测设置。在扳机设置中，确定用于正电子扳机的塑料闪烁体的合适厚度。在正电子气中可以降低3-离子的脱气效应的气凝胶和氮气环境$\gamma$歼灭。的$\gamma$射线探测部件由覆盖有反射器的196个锗酸铋（BGO）晶体组成。评估了BGO晶体的光产率和能量分辨率均匀性，以及用于更好地收集光的最合适的反射器。还检查了BGO晶体的源位置依赖性测试。发现单层聚萘二甲酸乙二醇酯（PEN）薄膜塑料闪烁体和具有连续氮气流的气凝胶分别适合于正电子触发和an灭环境。196种BGO晶体的光产率及其均匀性证实了其在光学领域的应用$\gamma$KAPAE检测器中的X射线检测。此外，与特氟龙反射器相比，VM2000具有较小的厚度和良好的反射率，因此被认为是最合适的反射器。