Development of CdTe detector having high energy resolution-toward the search for the double-beta decay-

面向未来的无中微子双β衰变搜索，我们开发了一种厚度超过5mm的CdTe探测器，对几个MeV的辐射具有高能量分辨率。CdTe半导体具有信号大小依赖于相互作用点的特点，这使其作为辐射探测器的能量分辨率下降。利用脉冲形状信息对662 keV伽马射线的信号脉冲高度进行校正，获得了2%的高能量分辨率。

Towards the future neutrino-less double beta decay search, we have developed a CdTe detector of more than 5mm thickness and having high energy resolution for a few MeV radiations.The CdTe semiconductor has characteristics that the signal size depends on the interaction point, which worsen the energy resolution as the radiation detector. We have obtained the high energy resolution of 2%(FWHM) for the 662 keV gamma ray by correcting the signal pulse height using the pulse shape information.