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    • Final Results of GERDA on the Two-Neutrino Double-β Decay Half-Life of ^76Ge

    Physical Review Letters（2023）

    INFN | UCL | Univ Zurich | Natl Res Ctr Kurchatov Inst | Russian Acad Sci | Max Planck Inst Kernphys | Univ Padua | Tech Univ Munich | Max Planck Inst Phys & Astrophys | INFN Milano Bicocca | NRC Kurchatov Inst | Joint Inst Nucl Res | Eberhard Karls Univ Tubingen | INFN Padova | European Commiss | Tech Univ Dresden | Jagiellonian Univ | Univ Milan

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    Abstract
    We present the measurement of the two-neutrino double-fl decay rate of 76Ge performed with the GERDA Phase II experiment. With a subset of the entire GERDA exposure, 11.8 kg yr, the half-life of the process has been determined: T2 nu 1/2 1/4 o2.022 +/- 0.018stat +/- 0.038syst thorn x 1021 yr. This is the most precise determination of the 76Ge two-neutrino double-beta decay half-life and one of the most precise measurements of a double-beta decay process. The relevant nuclear matrix element can be extracted: M2 nu eff = (0.101 +/- 0.001).
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    Double-Beta Decay,Neutrino Detection
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    Chat Paper
    【要点】：本文报道了利用GERDA Phase II实验对^76Ge双中微子双β衰变半衰期的测量结果，实现了该衰变过程半衰期最精确的确定，并提取了相关的有效核矩阵元。
    

    【方法】：研究采用GERDA Phase II实验设备，通过检测^76Ge的放射性衰变事件来测量双中微子双β衰变的半衰期。
    

    【实验】：实验使用了11.8 kg yr的 GERDA 数据集，得出^76Ge双中微子双β衰变半衰期为 T_{1/2}^{2ν}=(2.022±0.018_{stat}±0.038_{syst})×10^{21} yr，这是该衰变过程最精确的测量结果。
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