\begin{document}$ {0\nu\beta\beta} $\end{document}) decay of 76Ge. A total of 504.3 kg\begin{document}$ \cdot $\end{document}day effective exposure data was accumulated. The anti-coincidence and the multi/single-site event (MSE/SSE) discrimination methods were used to suppress the background in the energy region of interest (ROI, 1989–2089 keV for this work) with a factor of 23. A background level of 0.33 counts/ (keV\begin{document}$ \cdot $\end{document}kg\begin{document}$ \cdot $\end{document}yr) was realized. The lower limit on the half life of 76Ge \begin{document}$ {0\nu\beta\beta} $\end{document} decay was constrained as \begin{document}$T_{1/2}^{0\nu}\ > \ {1.0}\times $\end{document} \begin{document}$ 10^{23}\ \rm yr\ (90{\text{%}} \ C.L.) $\end{document}, corresponding to the upper limits on the effective Majorana neutrino mass: \begin{document}$ \langle m_{\beta\beta}\rangle < $\end{document} 3.2–7.5\begin{document}$ \ \mathrm{eV} $\end{document}."> Searching for <sup>76</sup>Ge neutrinoless double beta decay with the CDEX-1B experiment -
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