论文标题
下一个中性less双β衰减搜索的实验状态
Status of the NEXT experiment for neutrinoless double beta decay searches
论文作者
论文摘要
Next（使用Xenon TPC实验的中微子实验）是位于西班牙实验室subterráneoDeCanfranc（西班牙LSC）实验室的中微子双β衰变实验。它的目的是通过检测富含$^{136} $ XE同位素的Xenon气体中的中微子双β衰减过程来证明中微子是一个主要粒子。接下来使用的探测器技术是具有电致发光扩增的径向高压时间投影室，该室在感兴趣的能量区域中提供了优秀的能量分辨率，比1 $ \％$ fwhm更好，拓扑重建，允许拒绝单电子背景事件，并具有强大的潜力。该实验已经分阶段发展。 Next-White检测器最近在LSC完成了操作，并包含大约5 kg的活性XE质量。它的目的是证明出色的能源分辨率，验证重建算法和背景模型，并对$^{136} $ XE的两中性双β衰减进行测量。 100 kg Next-100探测器正在建设中，计划在2022年上半年安装和组装。预测的90 $ \％$ \％$ cl对中微子双β衰变半衰期的敏感性将达到$ 10^{26} $年份，即大约400 kg $ \ cdot $ \ cdot $ peal。 还在进行开发吨尺度检测器的剧烈计划，包括广泛的r $ \＆$ d，以实现现场ba $^{2+} $标记，作为实现几乎零背景检测的手段。 LSC的第一个模块至少为500 kg，最早可能在2026年运行。 在本手稿中，将提出从下一个白人检测器以及下一个100的施工状态以及未来下一个检测器的前景中获得的最新结果。
NEXT (Neutrino Experiment with a Xenon TPC) is a neutrinoless double beta decay experiment located at the Laboratorio Subterráneo de Canfranc (LSC, Spain). Its aim is to demonstrate that the neutrino is a Majorana particle by detecting the neutrinoless double beta decay process in xenon gas enriched in the $^{136}$Xe isotope. The detector technology used in NEXT is that of radiopure high pressure time projection chambers with electroluminescence amplification, which provide excellent energy resolution better than 1$\%$ FWHM in the energy region of interest, topological reconstruction that allows rejecting single-electron background events and a strong potential for "in situ" tagging of the barium daughter ion. The experiment has been developing in phases. The NEXT-White detector has recently finished operation at the LSC and contained approximately an active Xe mass of 5 kg. Its purpose was to demonstrate the excellent energy resolution, to validate the reconstruction algorithms and the background model, and to make a measurement of the two-neutrino double beta decay of $^{136}$Xe. The 100 kg NEXT-100 detector is under construction and is scheduled to be installed and assembled by the first half of 2022. The predicted 90$\%$ CL sensitivity to the neutrinoless double beta decay half-life will reach $10^{26}$ years for an exposure of about 400 kg $\cdot$ year. A vigorous program towards the development of ton-scale detectors is also under way, including extensive R$\&$D towards the realization of in-situ Ba$^{2+}$ tagging as means to achieve virtually zero-background detection. A first module with a mass of at least 500 kg may be operating as early as 2026 at the LSC. In this manuscript, recent results obtained with the NEXT-White detector will be presented, as well as the NEXT-100 construction status and on the prospects of future NEXT detectors.
