在NEXT-100探测器中演示子百分比的能量分辨率
Demonstration of Sub-Percent Energy Resolution in the NEXT-100 Detector
AI总结：
NEXT-100探测器通过高能校准实现了子百分比能量分辨率，验证了其在寻找中微子less双β衰变中的高精度能量测量能力。
摘要：
NEXT-100是一种高压氙时间投影室，配备电致发光放大，设计用于在13.5 bar下操作，最多可容纳约70.5 kg。它是NEXT合作组织为寻找氙-136的中微子less双β衰变（ββ0ν）而开发的最新探测器。NEXT气体TPC技术在氙探测器中提供了最佳的能量分辨率，接近衰变的Q值（Q_ββ = 2458 keV），设计目标为小于1%的FWHM。我们在此报告了使用钍-228源对探测器进行高能校准，展示了线性响应和在铊-208光电峰（2615 keV）处的能量分辨率为（0.90 ± 0.02）% FWHM。这种性能可外推到双β衰变终点处的分辨率R(Q_ββ) =（0.93 ± 0.02）% FWHM，证实了探测器在寻找ββ0ν中的精确能量测量能力。
英文摘要：
NEXT-100 is a high-pressure xenon time projection chamber with electroluminescent amplification, designed to operate with up to approximately 70.5 kg at 13.5 bar. It is the most recent detector developed by the NEXT collaboration to search for the neutrinoless double-beta decay ($ββ0ν$) of Xe-136. The NEXT gas TPC technology offers the best energy resolution near the Q-value of the decay ($Q_{ββ}$ = 2458 keV) among xenon detectors, which is set by design to be <1% FWHM. We report here the high-energy calibration of the detector using a Th-228 source, demonstrating linear response and an energy resolution of $(0.90 \pm 0.02)$% FWHM at the Tl-208 photopeak (2615 keV). This performance extrapolates to a resolution at the double-beta decay end-point of $R(Q_{ββ})$ = $(0.93 \pm 0.02)$% FWHM, confirming the detector's capability for precision energy measurement in the search for $ββ0ν$.
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