Double-weak decays of 124Xe and 136Xe in the XENON1T and XENONnT experiments
Double-weak decays of 124Xe and 136Xe in the XENON1T and XENONnT experiments
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DOI：
10.1103/physrevc.106.024328
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发表时间：
2022-08-26
影响因子：
3.1
通讯作者：
Zhu, T.
中科院分区：
文献类型：
--
作者：
Aprile, E.;Abe, K.;Zhu, T.
我们给出了Xe-124的双中微子双电子俘获(2nu ECEC)和XENON1T中136Xe的无中微子双β衰变(OW)的研究结果。我们考虑了2nu ECEC信号模型中从K壳层到N壳层的俘获，并测量了T-1/2(2nu ECEC)=(1.1+/-0.2(Stat)+/-0.1(Sys))x 10(22)yr的总半衰期，暴露于0.87 kg Yr的同位素。该信号的统计意义为7.00。我们使用年暴露36.16公斤Xe-136的XENON1T数据来搜索O nuβ。我们没有发现信号的证据，并设定了T-1/2(Beta Beta)和gt；1.2x10(24)yr在90%CL的半衰期下限。这是迄今为止没有浓缩靶的暗物质探测器获得的最好结果。我们还报告了XENONnT对OW的敏感性预测。假设年Xe-136曝光量为275公斤，预计灵敏度为T-1/2(0nu)>；2.1x10(25)yr，90%CL，对应于<；m(Beta)>；<；(0.19-0.59)ev/c(2)的有效Majorana质量范围。
We present results on the search for two-neutrino double-electron capture (2 nu ECEC) of Xe-124 and neutrinoless double-beta decay (OW) of 136Xe in XENON1T. We consider captures from the K shell up to the N shell in the 2 nu ECEC signal model and measure a total half-life of T-1/2(2 nu EcEc) = (1.1 +/- 0.2(stat) +/- 0.1(sys)) x 10(22) yr with a 0.87 kg yr isotope exposure. The statistical significance of the signal is 7.00. We use XENON1T data with 36.16 kg yr of Xe-136 exposure to search for O nu beta beta. We find no evidence of a signal and set a lower limit on the half-life of T-1/2(beta beta) > 1.2 x 10(24) yr at 90% CL. This is the best result from a dark matter detector without an enriched target to date. We also report projections on the sensitivity of XENONnT to OW. Assuming a 275 kg yr Xe-136 exposure, the expected sensitivity is T-1/2(0 nu) > 2.1 x 10(25) yr at 90% CL, corresponding to an effective Majorana mass range of < m(beta beta)> < (0.19-0.59) eV/c(2).