论文标题
Cuore实验的新结果
New results from the CUORE experiment
论文作者
论文摘要
罕见事件的低温地下观测站(Cuore)是第一个低温实验,寻找中准less double-beta($0νβ$)衰变,它已经能够达到一顿量表。该探测器位于意大利的实验室Nazionali del Gran Sasso,由988 TEO $ _2 $晶体组成,该晶体以19座塔的紧凑型圆柱结构排列。在2016年8月探测器建设完成后,Cuore于2017年以大约10 mk的基本温度开始了其首次物理数据运行。在2018年进行了多次优化活动之后,Cuore目前处于稳定的操作模式。在2019年,Cuore发布了2 \ TextSuperScript {nd}搜索$0νβ$的结果,其teo $ _2 $暴露于372.5 kg $ \ cdot $ yr和中位数排除敏感性,对$^{130} $ te $0νββ$ decay的中位数敏感性。我们没有发现$0νβ$衰减的证据,并设置了90 \%c.i。 (可信度间隔)$ 3.2 \ cdot 10^{25} $ yr $^{130} $ te $0νββ$ decay半衰期的贝叶斯下限。在这项工作中,我们介绍了Cuore搜索$0νββ$的当前状态,并回顾了检测器性能。最后,我们给出了Cuore背景模型的更新以及$^{130} $ TE的测量值两个中微子双β($2νββ$)衰减的半衰期。
The Cryogenic Underground Observatory for Rare Events (CUORE) is the first cryogenic experiment searching for neutrinoless double-beta ($0νββ$) decay that has been able to reach the one-ton scale. The detector, located at the Laboratori Nazionali del Gran Sasso in Italy, consists of an array of 988 TeO$_2$ crystals arranged in a compact cylindrical structure of 19 towers. Following the completion of the detector construction in August 2016, CUORE began its first physics data run in 2017 at a base temperature of about 10 mK. Following multiple optimization campaigns in 2018, CUORE is currently in stable operating mode. In 2019, CUORE released its 2\textsuperscript{nd} result of the search for $0νββ$ with a TeO$_2$ exposure of 372.5 kg$\cdot$yr and a median exclusion sensitivity to a $^{130}$Te $0νββ$ decay half-life of $1.7\cdot 10^{25}$ yr. We find no evidence for $0νββ$ decay and set a 90\% C.I. (credibility interval) Bayesian lower limit of $3.2\cdot 10^{25}$ yr on the $^{130}$Te $0νββ$ decay half-life. In this work, we present the current status of CUORE's search for $0νββ$, as well as review the detector performance. Finally, we give an update of the CUORE background model and the measurement of the $^{130}$Te two neutrino double-beta ($2νββ$) decay half-life.