Analysis techniques for the evaluation of the neutrinoless double-β decay lifetime in 130Te with the CUORE-0 detector
Analysis techniques for the evaluation of the neutrinoless double-β decay lifetime in 130Te with the CUORE-0 detector
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DOI：
10.1103/physrevc.93.045503
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发表时间：
2016-04-25
影响因子：
3.1
通讯作者：
Zucchelli, S.
中科院分区：
文献类型：
--
作者：
Alduino, C.;Alfonso, K.;Zucchelli, S.
我们详细描述的方法，用于获得的寿命下限的中微子双β（0努β β）衰变在Te-130和相关的限制上的有效马约拉纳质量的中微子使用CUORE-0探测器。CUORE-0是一个位于Gran Sasso国家实验室的测辐射热探测器阵列，旨在验证为CUORE开发的背景减少技术，CUORE是计划于2016年上线的下一代实验。CUORE-0本身也是一个具有竞争力的0 nu beta beta衰变搜索，并作为一个平台进一步开发CUORE中使用的分析工具和程序。这些包括数据收集、事件选择和处理以及信号效率评估。特别是，我们描述的幅度评估，热增益稳定，能量校准方法，和分析事件的选择，用于创建我们的最终0努贝塔搜索谱。我们定义了我们的高级分析程序，重点是获得的新见解和遇到的挑战。我们详细概述了我们的拟合方法附近的假设0努β β衰变峰和目录系统的不确定性的主要来源。最后，我们推导出了先前报道的CuORE-0的0 nu β β衰变半衰期极限，T-1/2（0 nu）> 2.7 x 10（24）年，并结合Cuoricino极限，T-1/2（0 nu）> 4.0 x 10（24）年。
We describe in detail the methods used to obtain the lower bound on the lifetime of neutrinoless double-beta (0 nu beta beta) decay in Te-130 and the associated limit on the effective Majorana mass of the neutrino using the CUORE-0 detector. CUORE-0 is a bolometric detector array located at the Laboratori Nazionali del Gran Sasso that was designed to validate the background reduction techniques developed for CUORE, a next-generation experiment scheduled to come online in 2016. CUORE-0 is also a competitive 0 nu beta beta decay search in its own right and functions as a platform to further develop the analysis tools and procedures to be used in CUORE. These include data collection, event selection and processing, as well as an evaluation of signal efficiency. In particular, we describe the amplitude evaluation, thermal gain stabilization, energy calibration methods, and the analysis event selection used to create our final 0 nu beta beta search spectrum. We define our high level analysis procedures, with emphasis on the new insights gained and challenges encountered. We outline in detail our fitting methods near the hypothesized 0 nu beta beta decay peak and catalog the main sources of systematic uncertainty. Finally, we derive the 0 nu beta beta decay half-life limits previously reported for CUORE-0, T-1/2(0 nu) > 2.7 x 10(24) yr, and in combination with the Cuoricino limit, T-1/2(0 nu) > 4.0 x 10(24) yr.