Analysis Techniques for the Evaluation of the Neutrinoless Double-Beta Decay Lifetime in $^{130}$Te with CUORE-0
CUORE Collaboration, C. Alduino, K. Alfonso, D. R. Artusa, F. T. Avignone, O. Azzolini, T. I. Banks, G. Bari, J. W. Beeman, F. Bellini, A. Bersani, M. Biassoni,… 展开作者
CUORE Collaboration, C. Alduino, K. Alfonso, D. R. Artusa, F. T. Avignone, O. Azzolini, T. I. Banks, G. Bari, J. W. Beeman, F. Bellini, A. Bersani, M. Biassoni, C. Brofferio, C. Bucci, A. Caminata, L. Canonica, X. G. Cao, S. Capelli, L. Cappelli, L. Carbone, L. Cardani, P. Carniti, N. Casali, L. Cassina, D. Chiesa, N. Chott, M. Clemenza, S. Copello, C. Cosmelli, O. Cremonesi, R. J. Creswick, J. S. Cushman, I. Dafinei, A. Dally, C. J. Davis, S. Dell'Oro, M. M. Deninno, S. Di Domizio, M. L. Di Vacri, A. Drobizhev, D. Q. Fang, M. Faverzani, G. Fernandes, E. Ferri, F. Ferroni, E. Fiorini, S. J. Freedman, B. K. Fujikawa, A. Giachero, L. Gironi, A. Giuliani, L. Gladstone, P. Gorla, C. Gotti, T. D. Gutierrez, E. E. Haller, K. Han, E. Hansen, K. M. Heeger, R. Hennings-Yeomans, K. P. Hickerson, H. Z. Huang, R. Kadel, G. Keppel, Yu. G. Kolomensky, K. E. Lim, X. Liu, Y. G. Ma, M. Maino, L. Marini, M. Martinez, R. H. Maruyama, Y. Mei, N. Moggi, S. Morganti, P. J. Mosteiro, C. Nones, E. B. Norman, A. Nucciotti, T. O'Donnell, F. Orio, J. L. Ouellet, C. E. Pagliarone, M. Pallavicini, V. Palmieri, L. Pattavina, M. Pavan, G. Pessina, V. Pettinacci, G. Piperno, S. Pirro, S. Pozzi, E. Previtali, C. Rosenfeld, C. Rusconi, E. Sala, S. Sangiorgio, D. Santone, N. D. Scielzo, V. Singh, M. Sisti, A. R. Smith, L. Taffarello, M. Tenconi, F. Terranova, C. Tomei, S. Trentalange, G. Ventura, M. Vignati, S. L. Wagaarachchi, B. S. Wang, H. W. Wang, J. Wilson, L. A. Winslow, T. Wise, A. Woodcraft, L. Zanotti, G. Q. Zhang, B. X. Zhu, S. Zimmermann, S. Zucchelli
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18 pages, 18 figures. (Version 3 reflects only minor changes to the text. Few additional details, no major content changes.)
We describe in detail the methods used to obtain the lower bound on the lifetime of neutrinoless double-beta ($0νββ$) decay in $^{130}$Te 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 $0νββ$ 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 $0νββ$ decay 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 $0νββ$ decay peak and catalog the main sources of systematic uncertainty. Finally, we derive the $0νββ$ decay half-life limits previously reported for CUORE-0, $T^{0ν}_{1/2}>2.7\times10^{24}$ yr, and in combination with the Cuoricino limit, $T^{0ν}_{1/2}>4.0\times10^{24}$ yr.
CUORE-0 background analysis and evaluation of $^{130}$Te $2νββ$ decay half-life
CUORE是一个热测量实验，将寻找$^{130}$ Te的无中子双β衰变。CUORE-0是一个类似CUORE的塔，在2013年至2015年期间运行，以测试CUORE实验的性能。在这一过程中，我们提出的模型的结果，解开和量化的背景源，结合形成CUORE-0的能量谱。我们使用详细的基于Geant 4的模拟和贝叶斯拟合算法来重建实验数据，并评估背景源的活动。该分析的直接结果是测量$^{130}$ Te $2νββ$的衰变半衰期，我们对此进行了初步评估。
Improved Limit on Neutrinoless Double-Beta Decay in $^{130}$Te with CUORE
本文报道了用CUORE探测器在$^{130}$ Te中寻找无中微子双β衰变的新结果.相对于我们以前的结果，这种搜索受益于暴露量的四倍增加，触发阈值的降低和分析的改进。我们在$0νββ$感兴趣的衰变区域观察到$(1.38\pm0.07)\cdot10^{-2}$计数$/($ keV $\cdot$ kg $\cdot$ yr $)$的背景，总暴露量为372.5 kg $\cdot$ yr，我们获得了$1.7\cdot10^{25}$ yr的中位排除灵敏度。我们没有发现$0νββ$衰变的证据，并将该过程的$^{130}$ Te半衰期的$90\%$ CI贝叶斯下限设定为$3.2\cdot10^{25}$年。在假设$0νββ$衰变是由轻马约拉纳中微子介导的情况下，这导致马约拉纳有效质量的上限为75-350 meV，这取决于所使用的核矩阵元素。
Addendum to: QRPA uncertainties and their correlations in the analysis of neutrinoless double beta decay
在以前的文章[Phys. Rev. D 79，053001（2009）]中，我们在准粒子无规相位近似（QRPA）中估计了与无中微子双β衰变（0 nu β β）的核矩阵元（NME）相关的不确定性。这种估计包括最近对NME的独立计算，因此仍然可以提供核模型不确定性的公平代表。在这种情况下，我们比较了Ge-76中0 nu β β衰变的声明与最近在Ge-136和其他核中的负结果，并推断了在90% C. L.时允许或排除的寿命范围。我们还强调了一些问题，应加以解决，以适当地比较和结合来自不同的0 nu β β衰变候选核的结果。
