论文标题
Ba $^（2+}
Ba$^{2+}$ ion trapping by organic submonolayer: towards an ultra-low background neutrinoless double beta decay detector
论文作者
论文摘要
如果中微子是其自己的反植物，则可能会发生原本被验证的核反应，称为中微子双β衰减（$ββ0ν$），预计有一个特征性的寿命会很长，这使得对背景的抑制作用是艰巨的任务。已经表明，在双重β衰变$ {}^{}^{136} \ Mathrm {Xe} \ rightArow {} \ rightArow {}^{136}^{136} $ ba $^$ ba $^{+ 2 e+ 2 e+ 2 e+ 2 e++ aviration a firtly Lidefly Lidefly Lidefly Lestional friver firliancy firlianction frestion a ba $ ba $^{+ 2 e+ 2 e+（ 实验。为了识别这些\ bapp，下一次合作正在探索化学传感器作为关键工具。尽管在许多领域中都使用，但这种化学传感器在粒子物理领域的应用是完全新颖的，需要实验证明它们在Xenon燃气室的超干燥环境中的适用性。在这里，我们使用互补的表面科学技术的组合来明确地表明，Ba $^{+2} $离子可以被有机分子在真空中捕获（螯合），即所谓的荧光双色指示剂（FBI）（FBI）（下一个化学体开发的一个），在表面上被固定在表面上。一旦将分子固定在AU（111）表面并解释与不同离子捕获相关的发射荧光移位的起源，我们就会揭示离子捕获机制。此外，我们证明螯合也发生在技术相关的底物上，因此证明了将FBI指标用作BA $^{+2} $检测器的构件的可行性。
If neutrinos are their own antiparticles, the otherwise-forbidden nuclear reaction known as neutrinoless double beta decay ($ββ0ν$) can occur, with a characteristic lifetime which is expected to be very long, making the suppression of backgrounds a daunting task. It has been shown that detecting (``tagging'') the Ba$^{+2}$ dication produced in the double beta decay ${}^{136}\mathrm{Xe} \rightarrow {}^{136}$Ba$^{+2}+ 2 e + (2 ν)$ in a high pressure gas experiment, could lead to a virtually background free experiment. To identify these \Bapp, chemical sensors are being explored as a key tool by the NEXT collaboration . Although used in many fields, the application of such chemosensors to the field of particle physics is totally novel and requires experimental demonstration of their suitability in the ultra-dry environment of a xenon gas chamber. Here we use a combination of complementary surface science techniques to unambiguously show that Ba$^{+2}$ ions can be trapped (chelated) in vacuum by an organic molecule, the so-called fluorescent bicolour indicator (FBI) (one of the chemosensors developed by NEXT), immobilized on a surface. We unravel the ion capture mechanism once the molecules are immobilised on Au(111) surface and explain the origin of the emission fluorescence shift associated to the trapping of different ions. Moreover, we prove that chelation also takes place on a technologically relevant substrate, as such, demonstrating the feasibility of using FBI indicators as building blocks of a Ba$^{+2}$ detector.
