NEXT双β衰变实验
The NEXT double beta decay experiment
摘要：
NEXT（Neutrino Experiment with a Xenon TPC）旨在利用电致发光放大电离信号，观察高压气体氙时间投影室中\ensuremath{{}^{136}\rm Xe}的无中微子双β衰变。该技术的两个主要优点是高能量分辨率和重建电子轨迹的可能性。NEXT-100是一种电致发光的非对称TPC，它将在15巴的压力下容纳100公斤的\ensuremath{{}^{136}\rm Xe}同位素。一方面，稀疏的光电倍增管阵列记录了主要的闪烁信号，它给出了事件的开始时间，以及电致发光，它给出了总沉积能量的精确测量。另一方面，一个密集的硅光电倍增器网格提供了电子轨迹的重建。能够重建径迹的位置是双重有用的：一方面，它允许校正事件的能量，其根据位置而变化，另一方面，它提供了用于背景抑制的额外处理，因为双电子径迹在两端显示更高的能量密度，而单电子径迹仅在一端显示更高的能量密度。经过一个原型阶段（2009-2014年），NEXT已经完成了建设，并开始在西班牙比利牛斯山脉的Canfranc Subterráneo实验室的第一阶段（NEW）运行，目标是测量NEXT背景模型和双β衰变的双中微子模式。
英文摘要：
NEXT (Neutrino Experiment with a Xenon TPC) aims to observe the neutrinoless double beta decay of \ensuremath{{}^{136}\rm Xe} in a high-pressure gas xenon Time Projection Chamber using electroluminescence to amplify the signal from ionization. The two main advantages of this technology are a high energy resolution and the possibility of reconstructing electron tracks. NEXT-100 is an electroluminescent, asymmetric TPC which will host 100 kg of the \ensuremath{{}^{136}\rm Xe} isotope at 15 bar of pressure. On one side, a sparse array of photomultipliers records both the primary scintillation signal, which gives the starting time of the event, and electroluminescence, which gives a precise measurement of the total deposited energy. On the other side, a dense grid of silicon photomultipliers provides the reconstruction of the electron tracks. Being able to reconstruct the position of a track is doubly useful: on the one hand, it allows the correction of the energy of the event, which varies according to position, and on the other hand it provides an extra handle for background rejection, since a two-electron track shows higher energy density at both ends, while a single-electron track only at one end. After a prototyping period (2009-2014) NEXT has completed the construction and started the operation of its first phase (NEW) in the Laboratorio Subterráneo de Canfranc, in the Spanish Pyrenees, with the objectives of measuring the NEXT background model and the two-neutrino mode of the double beta decay.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
