NEXT-100探测器对无中微子双β衰变的灵敏度
Sensitivity of the NEXT-100 detector to neutrinoless double beta decay
摘要：
一个高压氙气时间投影室与电致发光放大（EL HPGSTPC）寻找无中微子双β（$0νββ$）衰变提供：优秀的能量分辨率（$0.5-0.7\%$半高宽在$Q_{ββ}$），通过放大的电离信号与电致发光，和跟踪能力，所展示的NEXT合作使用两个公斤级的原型。NEXT合作项目正在建造一个EL HPGST-TPC，能够容纳100 kg（NEXT-100）同位素富集在${{}^{136}\rm Xe}$中的氙。NEXT-100探测器计划于2018年在Canfranc Subterráneo（LSC）安装和调试。NEXT-100探测器的当前估计本底水平为关注能量区域内的$4\times10^{-4}$计数/keV-kg-yr或更低。假设在$Q_{ββ}$处的能量分辨率为0.75 $\%$ FWHM，$0νββ$信号效率约为28 $\%$，这给出了对于275 kg/年的暴露量，对$T^{0ν}_{1/2}>6.0\times10^{25}$/年的$0νββ$衰变半衰期的预期灵敏度（在90 $\%$ CL处）。NEXT实验的第一阶段称为NEW，目前正在LSC进行。新探测器是NEXT-100探测器的1：2尺寸（1：10质量），使用相同的材料和光电传感器，并将用于进行$0νββ$背景的表征和中微子标准双β衰变（${2νββ}$）的测量。新检测器中${2νββ}$信号的8 σ显著性估计为100天运行。
英文摘要：
A high pressure xenon gas time projection chamber with electroluminescent amplification (EL HPGXe TPC) searching for the neutrinoless double beta ($0νββ$) decay offers: excellent energy resolution ($0.5-0.7\%$ FWHM at the $Q_{ββ}$), by amplifying the ionization signal with electroluminescent light, and tracking capabilities, as demonstrated by the NEXT collaboration using two kg-scale prototypes. The NEXT collaboration is building an EL HPGXe TPC capable of holding 100 kg (NEXT-100) of xenon isotopically enriched in ${{}^{136}\rm Xe}$. The installation and commissioning of the NEXT-100 detector at the Laboratorio Subterráneo de Canfranc (LSC) is planned for 2018. The current estimated background level for the NEXT-100 detector is of $4\times10^{-4}$ counts/keV-kg-yr or less in the energy region of interest. Assuming an energy resolution of 0.75$\%$ FWHM at the $Q_{ββ}$ and a $0νββ$ signal efficiency of about 28$\%$, this gives an expected sensitivity (at 90$\%$ CL) to the $0νββ$ decay half life of $T^{0ν}_{1/2}>6.0\times10^{25}$ yr for an exposure of 275 kg yr. A first phase of the NEXT experiment, called NEW, is currently being commissioned at the LSC. The NEW detector is a scale 1:2 in size (1:10 in mass) of the NEXT-100 detector using the same materials and photosensors and will be used to perform a characterization of the $0νββ$ backgrounds and a measurement of the standard double beta decay with neutrinos (${2νββ}$). An 8 sigma significance for the ${2νββ}$ signal in the NEW detector has been estimated for a 100-day run.
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