AI 中文总结
本研究在PIKACHU实验中，评估了GAGG闪烁体在50-2614 keV能区对β、γ射线的非比例响应，发现γ射线响应更强，该响应可提升本底模型准确性，对实验本底建模与能量校准有重要意义。
AI 中文摘要
亚MeV辐射下闪烁光产额的非比例响应是无机闪烁体的已知特性。在PIKACHU实验中，精确理解GAGG（Ce掺杂的Gd₃Al₂Ga₃O₁₂）闪烁体的非比例响应对本底建模至关重要。本研究评估了GAGG闪烁体对β和γ射线的非比例响应：β射线响应采用锗探测器的康普顿符合技术测量，γ射线响应则通过多个单能γ射线源评估。测量结果显示，在50至2614 keV的能量范围内，β与γ射线的响应存在差异，γ射线的非比例响应强于β射线。纳入测量的非比例响应的本底模型，相比未校正非比例响应的模型，能更准确地复现测量的本底谱。这些结果表明，精确评估GAGG闪烁体的非比例响应十分重要，其不仅对PIKACHU实验的本底建模必不可少，对基于闪烁体的实验中的精确能量校准也至关重要。
英文摘要
Nonproportional response of scintillation light yield for sub-MeV radiations is a well-known characteristic of inorganic scintillators. In the PIKACHU experiment, a precise understanding of the nonproportional response of the GAGG ($\mathrm{Ce:Gd_3Al_2Ga_3O_{12}}$) scintillator is essential for background modeling. In this study, the nonproportional response of the GAGG scintillator was evaluated for both $β$ and $γ$ rays. The response for $β$ rays was measured using the Compton coincidence technique with a germanium detector, while that for $γ$ rays was evaluated using several monoenergetic $γ$-ray sources. The measurement results showed different responses for $β$ and $γ$ rays, with a stronger nonproportional response for $γ$ rays than for $β$ rays over the energy range of 50--2614~keV. The background model incorporating the measured nonproportional responses reproduced the measured background spectra more accurately compared with the model without the nonproportional response correction. These results demonstrate the importance of precise evaluation of the nonproportional response of the GAGG scintillator which is essential not only for background modeling in the PIKACHU experiment but also for accurate energy calibration in scintillator-based experiments.
Comments11 pages, 7 figures
