LUX-ZEPLIN(LZ)实验对$^{134}$中微子双β衰变和无中微子双β衰变的预测灵敏度
Projected sensitivity of the LUX-ZEPLIN (LZ) experiment to the two-neutrino and neutrinoless double beta decays of $^{134}$Xe
摘要:
本文给出了LUX-ZEPLIN(LZ)实验对$^{134}$中微子双β衰变和无中微子双β衰变的灵敏度。LZ是一个10吨重的氙时间投影室,用于探测暗物质粒子,预计将于2021年在美国桑福德地下研究设施开始运行。它的大质量天然氙提供了一个特殊的机会,以寻找双β衰变的$^{134}$氙,其中氙探测器富集在$^{136}$氙是不太有效的。对于双中微子衰变模式,预测LZ排除值的半衰期高达1.7 $\times$ 10 $^{24}$年在90%的置信水平(CL),并有一个三西格玛观测潜力为8.7 $\times$ 10 $^{23}$年,接近核模型的预测。对于无中微子衰变模式LZ,预计不包括在90% CL下长达7.3 $\times$ 10 $^{24}$年的半衰期值。
英文摘要:
The projected sensitivity of the LUX-ZEPLIN (LZ) experiment to two-neutrino and neutrinoless double beta decay of $^{134}$Xe is presented. LZ is a 10-tonne xenon time projection chamber optimized for the detection of dark matter particles, that is expected to start operating in 2021 at Sanford Underground Research Facility, USA. Its large mass of natural xenon provides an exceptional opportunity to search for the double beta decay of $^{134}$Xe, for which xenon detectors enriched in $^{136}$Xe are less effective. For the two-neutrino decay mode, LZ is predicted to exclude values of the half-life up to 1.7$\times$10$^{24}$ years at 90% confidence level (CL), and has a three-sigma observation potential of 8.7$\times$10$^{23}$ years, approaching the predictions of nuclear models. For the neutrinoless decay mode LZ, is projected to exclude values of the half-life up to 7.3$\times$10$^{24}$ years at 90% CL.
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