低温校准超导电离室用于低质量暗物质搜索
Low-Energy Calibration of SuperCDMS HVeV Cryogenic Silicon Calorimeters Using Compton Steps
AI总结：
利用康普顿阶梯对SuperCDMS HVeV探测器进行低温校准，发现0伏偏压下的探测器响应较预期弱30%，揭示了低质量暗物质搜索中探测器响应建模的挑战。
摘要：
低温电离室用于低质量暗物质搜索已实现了亚电子伏特的能量分辨率，推动了低能校准技术的发展和对探测器物理的理解。伽马射线与目标材料相互作用时的能量沉积光谱在原子电子结合能附近表现出阶梯状特征，称为康普顿阶梯。我们展示了利用康普顿阶梯对低温硅电离室进行亚千电子伏特校准的成功，利用四个SuperCDMS高电压电子伏特分辨率（HVeV）探测器在晶体上以0伏偏压运行。这种新的0伏校准与使用光学光子的已建立的高电压校准进行比较。比较表明，0伏下的探测器响应比预期弱约30%，突显了低质量暗物质搜索中探测器响应建模的挑战。
英文摘要：
Cryogenic calorimeters for low-mass dark matter searches have achieved sub-eV energy resolutions, driving advances in both low-energy calibration techniques and our understanding of detector physics. The energy deposition spectrum of gamma rays scattering off target materials exhibits step-like features, known as Compton steps, near the binding energies of atomic electrons. We demonstrate a successful use of Compton steps for sub-keV calibration of cryogenic silicon calorimeters, utilizing four SuperCDMS High-Voltage eV-resolution (HVeV) detectors operated with 0 V bias across the crystal. This new calibration at 0 V is compared with the established high-voltage calibration using optical photons. The comparison indicates that the detector response at 0 V is about 30% weaker than expected, highlighting challenges in detector response modeling for low-mass dark matter searches.
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