论文标题
双向衰减的$^{124} $ Xe和$^{136} $ XE在Xenon1t和Xenonnt实验中
Double-Weak Decays of $^{124}$Xe and $^{136}$Xe in the XENON1T and XENONnT Experiments
论文作者
论文摘要
我们在寻找$^{124} $ XE和NeutMinoLess Double-β$ decay（$0νββ$）的$^{136} $ XE的$^{124} $ XE和NeutiMless $ Xe和NeutiMless $ Xe $^{124} $ XE和NeutiMnoless $ Xe的$^{124} $ XE $^{124} $ XE的搜索结果。我们考虑从$2ν\ text {ecec} $信号模型中捕获从k-到n-shell，并测量$ t_ {1/2}^{2ν\ text {ecec}} =（1.1 \ pm0.2_ \ pm0.2_ \ text}} 10^{22} \; \ text {yr} $，带有$ 0.87 \; \ text {kg} \ times \ text \ text {yr} $ isotope曝光。信号的统计意义为$ 7.0 \，σ$。我们使用$ 36.16 \; \ text {kg} \ times \ text {yr} $ $^{136} $ xe暴露于搜索$0νββ$的$^{136} $。我们没有发现信号的证据，也没有设置$ t_ {1/2}^{0νββ}> 1.2 \ times 10^{24} \; \ text {yr} \;; \ text {at} \; 90 \，\％\; \ text {cl} $。这是迄今为止没有丰富目标的暗物质检测器的最佳结果。我们还报告了对Xenonnt至0νβ$的灵敏度的预测。假设$ 275 \; \ text {kg} \ times \ text {yr} $ $^{136} $ xe暴露，预期的敏感性为$ t_ {1/2}^{0νββ}> 2.1> 2.1 \ 2.1 \ times 10^{25} {25} {25} {25} {25} {\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ yr} {yr} {yr}} \ text {at} \; 90 \，\％\; \ text {cl} $，对应于有效的majorana质量范围为$ \ langle m_ {ββ} \ rangle <（0.19-0.59）\; \; \ text {ev/c}^2 $。
We present results on the search for double-electron capture ($2ν\text{ECEC}$) of $^{124}$Xe and neutrinoless double-$β$ decay ($0νββ$) of $^{136}$Xe in XENON1T. We consider captures from the K- up to the N-shell in the $2ν\text{ECEC}$ signal model and measure a total half-life of $T_{1/2}^{2ν\text{ECEC}}=(1.1\pm0.2_\text{stat}\pm0.1_\text{sys})\times 10^{22}\;\text{yr}$ with a $0.87\;\text{kg}\times\text{yr}$ isotope exposure. The statistical significance of the signal is $7.0\,σ$. We use XENON1T data with $36.16\;\text{kg}\times\text{yr}$ of $^{136}$Xe exposure to search for $0νββ$. We find no evidence of a signal and set a lower limit on the half-life of $T_{1/2}^{0νββ} > 1.2 \times 10^{24}\;\text{yr}\; \text{at}\; 90\,\%\;\text{CL}$. 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 $0νββ$. Assuming a $275\;\text{kg}\times\text{yr}$ $^{136}$Xe exposure, the expected sensitivity is $T_{1/2}^{0νββ} > 2.1 \times 10^{25}\;\text{yr}\; \text{at}\; 90\,\%\;\text{CL}$, corresponding to an effective Majorana mass range of $\langle m_{ββ} \rangle < (0.19 - 0.59)\;\text{eV/c}^2$.
