用于在大气压下搜索 $0νββ$ 的吨级氙气时间投影室
Ton-scale Xenon Gas TPC for $0νββ$ Search at Atmospheric Pressure
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中文总结 AI 辅助
本文提出一种常温常压运行的吨级氙气时间投影室，利用事件拓扑高效抑制γ本底，实现约10^27年灵敏度的无中微子双β衰变搜索。
中文摘要 AI 辅助
我们探索了一种非常规的吨级氙气时间投影室探测器的各个方面，该探测器在常温常压（NTP）下运行，旨在以约 $10^{27}$ 年的灵敏度实现 $0\nu\beta\beta$ 发现。在固定活性质量下，与更高密度相比，在NTP下对$\gamma$射线本底具有更大的透明度和更好的径迹清晰度。在NTP下运行还缓解了压力容器的困难，并显著降低了高压要求。由于在几MeV能量下具有米级电子径迹，事件拓扑可用于有效抑制丰富的$\gamma$射线本底，抑制因子范围为550至1200，这大大补偿了探测器更大的表面积。事件拓扑通过阳极平面信号结合对到达阴极平面的次级离子成分的传感来捕获。添加分子气体可限制次级电子径迹的扩散至1厘米以下，并提供稳定的比例雪崩增益。能量分辨率$\delta$E/E $\leq$ 1% FWHM似乎是可能的。该探测器技术的100公斤级演示装置可以直接通向吨级搜索。
英文摘要
We explore aspects of an unorthodox ton-scale xenon gas time projection chamber detector operated at normal temperature and pressure (NTP), designed for $0νββ$ discovery at $\sim10^{27}$ year sensitivity. At fixed active mass, a greater transparency to $γ$-ray backgrounds and better track clarity exists at NTP relative to higher density. Operation at NTP also alleviates difficulties with pressure containment and significantly reduces HV requirements. With metre-scale electron tracks at a few MeV, event topology can be used to efficiently reject the copious $γ$-ray backgrounds by factors ranging from 550--1200, largely compensating for the greater surface area of the detector. Event topology is captured from anode plane signals combined with sensing the secondary ion component arriving at the cathode plane. A molecular gas additive limits diffusion of the secondary electron tracks to below a cm and provides stable proportional avalanche gain. An energy resolution $δ$E/E $\leq$ 1\% FWHM seems possible. A 100 kg scale demonstrator for this detector technology could lead directly to a ton-scale search.
