We developed measurement systems for the simultaneous detection of phonon and scintillation signals from $$\hbox {Li}_2\hbox {MoO}_4$$ crystals based on the metallic magnetic calorimeter (MMC) technology. Two measurements were carried out using $$\hbox {Li}_2\hbox {MoO}_4$$ crystals of different sizes. The first measurement was conducted with a compact detection system designed for a $$1\times 1\times 1~\hbox {cm}^3$$ crystal. An advanced light detector with Neganov–Luke phonon amplification was adopted in the compact setup. Later, the second experiment was carried out using a cylindrical $$\hbox {Li}_2\hbox {MoO}_4$$ crystal of 5 cm in diameter and 5 cm in height. Another light detector was implemented with a 2-in. Ge wafer and an MMC sensor. Both measurements resulted in simultaneous detection of heat and light signals. Clear particle discriminations between $$\alpha $$- and $$\beta /\gamma $$-induced events were demonstrated by comparing amplitudes of the heat and light signals in both measurements. The heat signals in the larger setup showed an energy resolution of 18 keV FWHM for 2615 keV $$\gamma $$-rays. The energy linearity of the detector response was investigated for a suitable calibration near 3.034 MeV, the Q value of $$^{100}\hbox {Mo}$$ double-beta decay.

中文翻译：

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$$\hbox {Li}_2\hbox {MoO}_4$$Li2MoO4 具有 MMC 读出的声子闪烁检测系统

我们开发了测量系统，用于同时检测来自 $$\hbox {Li}_2\hbox {MoO}_4$$ 晶体的声子和闪烁信号，该系统基于金属磁量热计 (MMC) 技术。使用不同尺寸的 $$\hbox {Li}_2\hbox {MoO}_4$$ 晶体进行了两次测量。第一次测量是使用为 $$1\times 1\times 1~\hbox {cm}^3$$ 晶体设计的紧凑型检测系统进行的。在紧凑的设置中采用了具有 Neganov-Luke 声子放大功能的先进光检测器。随后，使用直径5厘米、高5厘米的圆柱形$$\hbox{Li}_2\hbox{M​​oO}_4$$晶体进行了第二个实验。另一个光探测器是用 2 英寸的。Ge晶片和MMC传感器。两种测量都导致同时检测到热和光信号。通过比较两种测量中的热和光信号的幅度，证明了 $$\alpha $$- 和 $$\beta/\gamma $$ 诱导事件之间的明显粒子区分。较大设置中的热信号显示出 2615 keV $$\gamma $$ 射线的能量分辨率为 18 keV FWHM。为了在 3.034 MeV 附近进行合适的校准，研究了探测器响应的能量线性，Q 值为 $$^{100}\hbox {Mo}$$ 双β 衰减。