New results about the revolutionary bolometer assembly of BINGO
New results about the revolutionary bolometer assembly of BINGO
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BINGO 革命性测辐射热计组件的新成果
DOI：
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发表时间：
2023
期刊：
影响因子：
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通讯作者：
A. Armatol
中科院分区：
文献类型：
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作者：
A. Armatol
寻找无中微子双β衰变(0$\nu$2$\beta$)是现代物理学的主要实验挑战之一。一种被称为测辐射热计的低温探测器给出了一种实验技术，它在这一目的上真的很有希望。使用这项技术的当代吨级实验CUORE对TeO$2$晶体的半衰期$^{130}$Te0$\nu$2$\beta$给予了最好的限制，但它的灵敏度受到其背景的限制。因此，下一代实验丘比特(CUORE升级与粒子识别)将研究嵌在Li$2$MoO$4$晶体中的$^{100}$Mo，以减少$\伽马$背景。它还将读取Li$2$Moo$4$产生的闪烁光，方法是在主吸收体旁边添加另一个Ge测辐射热计作为光探测器，以排除$\α$背景。正因为如此，丘比特的敏感度将比CUORE高2个数量级。然而，在这不足以检测到0$\nu$2$\beta$的情况下，bingo(双同位素下一代0$\nu$2$\beta$天文台)正在准备下一代测辐射实验。为了提高0$\nu$2$\beta$的发现灵敏度，目标是大幅减少感兴趣区域中的背景事件的数量，并结合使用之前引用的两种同位素：$^{130}$Te和$^{100}$Mo。为了实现这一目标，宾果公司提议实施主动低温否决权来抑制外部的伽马本底，利用Neganov-Trofimov-Luke效应来提高光探测器的灵敏度，并使用一种革命性的探测器组件来减少总的表面放射性贡献。在本文中，我们将重点讨论后者，并给出用两个45×45×$45 mm$^{3}$Li$_2$MoO$_4$晶体所获得的最新结果。
Searching for neutrinoless double-beta decay (0$\nu$2$\beta$) is one of the main experimental challenges of modern physics. One experimental technique is given by cryogenic detectors named bolometers that are really promising for this purpose. The current generation tonne-scale experiment CUORE using this technology is putting the best limit on $^{130}$Te 0$\nu$2$\beta$ half-life with TeO$_2$ crystals but its sensitivity is limited by its background. Therefore, it will be followed by the next generation experiment CUPID (CUORE Upgrade with Particle IDentification) that will study $^{100}$Mo embedded inside Li$_2$MoO$_4$ crystals in order to reduce the $\gamma$ background. It will also read the scintillation light produced by Li$_2$MoO$_4$ by adding another Ge bolometer acting as a light detector next to the main absorber to reject the $\alpha$ background. Thanks to that, CUPID will reach a sensitivity 2 orders of magnitude higher than CUORE. However, in the case where this is not enough to detect 0$\nu$2$\beta$, BINGO (Bi-Isotope Next Generation 0$\nu$2$\beta$ Observatory) is preparing the next-next generation of bolometric experiments. To improve the 0$\nu$2$\beta$ discovery sensitivity, the goal is to reduce drastically the number of background events in the region of interest and to combine the use of the two previously cited isotopes: $^{130}$Te and $^{100}$Mo. To achieve this goal, BINGO is proposing to implement an active cryogenic veto to suppress the external $\gamma$ background, to use Neganov-Trofimov-Luke effect to increase light detector sensitivity and to use a revolutionary detector assembly to reduce the total surface radioactivity contribution. In this article, we will focus on the latter and present the latest results obtained with two 45$\times$45$\times$45 mm$^{3}$ Li$_2$MoO$_4$ crystals.
影响因子：
64.8
作者：
CUORE Collaboration
通讯作者：
CUORE Collaboration