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arXiv 2203.08684nucl-ex
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用CUORE研究$^{120}$ Te的无中性$β^+EC$衰变

Search for Neutrinoless $β^+EC$ Decay of $^{120}$Te with CUORE

D. Q. Adams, C. Alduino, K. Alfonso, F. T. Avignone, O. Azzolini, G. Bari, F. Bellini, G. Benato, M. Beretta, M. Biassoni, A. Branca, C. Brofferio, C. Bucci, J.… 展开作者

D. Q. Adams, C. Alduino, K. Alfonso, F. T. Avignone, O. Azzolini, G. Bari, F. Bellini, G. Benato, M. Beretta, M. Biassoni, A. Branca, C. Brofferio, C. Bucci, J. Camilleri, A. Caminata, A. Campani, L. Canonica, X. G. Cao, C. Capelli, S. Capelli, L. Cappelli, L. Cardani, P. Carniti, N. Casali, E. Celi, D. Chiesa, M. Clemenza, S. Copello, O. Cremonesi, R. J. Creswick, A. D'Addabbo, I. Dafinei, F. Del Corso, S. Dell'Oro, S. Di Domizio, S. Di Lorenzo, V. Dompè, D. Q. Fang, G. Fantini, M. Faverzani, E. Ferri, F. Ferroni, E. Fiorini, M. A. Franceschi, S. J. Freedman, S. H. Fu, B. K. Fujikawa, S. Ghislandi, A. Giachero, A. Gianvecchio, L. Gironi, A. Giuliani, P. Gorla, C. Gotti, T. D. Gutierrez, K. Han, E. V. Hansen, K. M. Heeger, R. G. Huang, H. Z. Huang, J. Johnston, G. Keppel, Yu. G. Kolomensky, R. Kowalski, C. Ligi, R. Liu, L. Ma, Y. G. Ma, L. Marini, R. H. Maruyama, D. Mayer, Y. Mei, S. Morganti, T. Napolitano, M. Nastasi, J. Nikkel, C. Nones, E. B. Norman, A. Nucciotti, I. Nutini, T. O'Donnell, M. Olmi, J. L. Ouellet, S. Pagan, C. E. Pagliarone, L. Pagnanini, M. Pallavicini, L. Pattavina, M. Pavan, G. Pessina, V. Pettinacci, C. Pira, S. Pirro, S. Pozzi, E. Previtali, A. Puiu, S. Quitadamo, A. Ressa, C. Rosenfeld, M. Sakai, S. Sangiorgio, B. Schmidt, N. D. Scielzo, V. Sharma, V. Singh, M. Sisti, D. Speller, P. T. Surukuchi, L. Taffarello, F. Terranova, C. Tomei, K. J. Vetter, M. Vignati, S. L. Wagaarachchi, B. S. Wang, B. Welliver, J. Wilson, K. Wilson, L. A. Winslow, S. Zimmermann, S. Zucchelli

摘要:

CUORE是寻找$^{130}$ Te中无中微子双β衰变($0νββ$)的大型低温实验。CUORE探测器由天然碲制成,提供了对$^{130}$ Te以外的同位素进行稀有事件搜索的可能性。在这项工作中,我们描述了一个搜索无中微子正电子发射电子捕获($0νβ^+EC$)衰变在$^{120}$ Te与总TeO $_2$曝光355.7公斤$\cdot$年,相当于0.2405公斤$\cdot$年的$^{120}$ Te。尽管具有两个终态电子的$0 νββ$代表了最有希望的通道,但正电子和两个511 keV $γ$的发射使$0νβ^+EC$的衰变特征非常清晰。为了充分利用探测器模块化提供的潜力,我们包括具有不同拓扑结构的事件,并同时拟合五个选定的信号特征。使用设盲数据,我们提取了90%可信区间(C.I.)时的中位排除敏感性$3.4 \cdot 10^{22}$年。揭盲后,我们未发现$0νβ^+EC$信号的证据,并将其设定为90% C. I。$^{120}$ Te半衰期中$2.9 \cdot 10^{22}$年的贝叶斯下限。这一结果提高了一个数量级的现有限制从CUORE-0和Cuoricino的组合分析。

英文摘要:

CUORE is a large scale cryogenic experiment searching for neutrinoless double beta decay ($0νββ$) in $^{130}$Te. The CUORE detector is made of natural tellurium, providing the possibility of rare event searches on isotopes other than $^{130}$Te. In this work we describe a search for neutrinoless positron emitting electron capture ($0νβ^+EC$) decay in $^{120}$Te with a total TeO$_2$ exposure of 355.7 kg $\cdot$ yr, corresponding to 0.2405 kg $\cdot$ yr of $^{120}$Te. Albeit $0 νββ$ with two final state electrons represents the most promising channel, the emission of a positron and two 511-keV $γ$s make $0νβ^+EC$ decay signature extremely clear. To fully exploit the potential offered by the detector modularity we include events with different topology and perform a simultaneous fit of five selected signal signatures. Using blinded data we extract a median exclusion sensitivity of $3.4 \cdot 10^{22}$ yr at 90% Credibility Interval (C.I.). After unblinding we find no evidence of $0νβ^+EC$ signal and set a 90% C.I. Bayesian lower limit of $2.9 \cdot 10^{22}$ yr on $^{120}$Te half-life. This result improves by an order of magnitude the existing limit from the combined analysis of CUORE-0 and Cuoricino.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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