论文标题

搜索中微子$β^+ec $ $^{120} $ te与cuore

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

论文作者

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

论文摘要

Cuore是一个大规模的低温实验,在$^{130} $ TE中寻找中微子双β衰减($0νββ$)。 Cuore探测器由天然三学生制成,提供了在$^{130} $ TE以外的同位素上进行罕见事件搜索的可能性。在这项工作中,我们描述了在$^{{120} $ TE中搜索中微子positron发射电子捕获($0νβ^+ec $)的衰减,总计teo $ _2 $暴露于355.7 kg $ \ cdot $ yr,对应于0.2405 kg $ \ cdot $ yr $ yr $^yr $^{120} $ yr。尽管具有两个最终状态电子的$ 0νββ$代表了最有前途的渠道,但正电子的发射和两个511-kev $γ$ s的发射使$0νβ^+ec $ $ n衰变签名非常清楚。为了完全利用检测器模块化提供的电势,我们包括具有不同拓扑的事件,并同时拟合了五个选定的信号特征。使用盲数据,我们提取$ 3.4 \ cdot 10^{22} $ yr的中值排除灵敏度在90%的信誉间隔(C.I。)。未闪烁后,我们找不到$0νβ^+ec $信号的证据,并将90%C.I设定。贝叶斯的下限$ 2.9 \ cdot 10^{22} $ yr $^{120} $ te半寿命。该结果通过数量级提高了Cuore-0和Cuoricino的组合分析的现有限制。

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.

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